WO2016088524A1 - Seal ring - Google Patents

Abstract

Provided is a seal ring capable of being manufactured at low cost by injection molding and capable of reducing the amount of leakage of fluid. A seal ring is integrally formed in an annular overall shape, which has a cutout at one circumferential location, using a thermoplastic resin composition. The seal ring has a ring body and also has a first protrusion (21) and a second protrusion (22), which are provided protruding in the circumferential direction from a first end and a second end of the ring body. The transverse cross-section of the ring body is rectangular, the transverse cross-section of the second protrusion (22) is triangular, and the first protrusion (21) has a slope conforming surface (23) parallel to the sloped surface (24) of the bottom side of the triangle of the second protrusion (22). The first protrusion (21) and the second protrusion (22) are dimensioned so as not to protrude from a basic rectangular shape when the first protrusion (21) and the second protrusion (22) are overlapped and the cut is closed.

Description

Seal ring

The present invention relates to a seal ring.

Conventionally, it has a generally annular overall shape with a cut at one circumference, has a ring main body, a first convex part and a second convex part that protrude in the circumferential direction from both ends of the ring main body, and is compressed A seal ring for sealing between the movable scroll of the machine and the housing is known, and the material thereof is mainly PTFE (polytetrafluoroethylene) (see, for example, Patent Document 1 and Patent Document 2).

JP 2007-247526 A JP-A-8-276508

A conventional seal ring of this type has been manufactured by first mechanically cutting a cylindrical PTFE material and then machining such as cutting, grinding, and cutting.
Therefore, the conventional ones have the disadvantages that the number of processing steps such as machining is increased, the material loss is increased, and the manufacturing cost is high.

On the other hand, manufacturing by injection molding is possible, but in that case, the sealing performance at the joint portion of the first convex portion and the second convex portion is lowered, and the amount of fluid (oil) leakage from the joint portion is excessive. There was a drawback. In the rocking test, it was confirmed that the amount of fluid (oil) leakage was significantly larger than that of the PTFE seal ring. It is not preferable from the viewpoint of the function of the compressor that the fluid leakage from the seal portion is extremely increased. Further, as the frictional resistance of the sliding contact surface that is in sliding contact with the sealed surface of the movable scroll or the housing increases, the sliding at the time of swing becomes unstable, and the joint portion of the first convex portion and the second convex portion This is a factor that increases the amount of fluid leakage by changing the seal gap.

Therefore, an object of the present invention is to provide a seal ring that can be manufactured at low cost by injection molding of a thermoplastic resin composition and that can reduce the amount of fluid leakage from the joint portion. In particular, an object of the present invention is to provide a seal ring suitable for a compressor that performs a scrolling motion.

The seal ring according to the present invention is formed in an annular overall shape having a cut at one place on the circumference, and protrudes in the circumferential direction from the ring body and the first and second ends of the ring body. In the seal ring having the first convex portion and the second convex portion, the whole is integrally formed of a thermoplastic resin composition, and the cross-sectional shape of the ring body is a rectangular shape, and the first convex portion The first convex portion is formed by dividing the rectangular cross section of the ring main body into two parts by separating lines and facing each other with the first corresponding surface and the second corresponding surface. A cross-sectional shape in which a scraped portion is formed on the opposite surface side of the first corresponding surface, and the first convex portion and the second convex portion are in a closed state where the first convex portion and the second convex portion overlap each other. The 2nd convex part is set to the dimension which does not protrude from the outline of the cross section of the ring body.

In addition, the ring main body is formed into an annular overall shape having a cut at one place on the circumference, and the first convex portion and the second convex portion projecting in the circumferential direction from the first end and the second end of the ring main body. In the seal ring having two convex portions, the whole is integrally formed of a thermoplastic resin composition, and the cross-sectional shape of the ring body is a corner between the movable side sealed surface and the fixed side sealed surface. Corresponding to the corner of the basic rectangle, the other corners of the basic rectangle as a diagonal are notched to form a notch, and the first and second convex portions are the notches. The cross section of the ring body having a cross-sectional shape is divided into two by a separation line so that the first corresponding surface and the second corresponding surface face each other, and the first convex portion is the notch portion of the ring body. In which a continuous cut-off portion is formed, and the first convex portion and the second convex portion overlap each other. Ri in suits cut closed, the first projection and the second projection is set to a dimension that does not protrude from the basic rectangle.

Further, the first slidable contact surface on which the ring main body is slidably contacted with the movable-side sealed surface includes a shallow groove-shaped notch for reducing frictional resistance.
Further, the first sliding contact surface on which the ring main body slides on the movable-side sealed surface is formed by coating with a material having a low friction coefficient so as to reduce the frictional resistance.

In addition, the ring main body is formed into an annular overall shape having a cut at one place on the circumference, and the first convex portion and the second convex portion projecting in the circumferential direction from the first end and the second end of the ring main body. A seal ring having two convex portions, and the whole is integrally formed of a thermoplastic resin composition, the cross-sectional shape of the ring body is circular, and the first convex portion and the second convex portion are The circular cross section of the ring main body is divided into two by a separation line so that the first corresponding surface and the second corresponding surface face each other, and the first convex portion and the second convex portion overlap each other. The dimension is set such that the first convex portion and the second convex portion do not protrude from the outline of the transverse cross section of the ring body in the closed state.

In addition, the ring main body is formed into an annular overall shape having a cut at one place on the circumference, and the first convex portion and the second convex portion projecting in the circumferential direction from the first end and the second end of the ring main body. A seal ring having two convex portions, and the whole is integrally formed of a thermoplastic resin composition, the cross-sectional shape of the ring body is circular, and the first convex portion and the second convex portion are The circular cross section of the ring main body is divided into two by a separation line so that the first corresponding surface and the second corresponding surface face each other, and the first convex portion is opposite to the first corresponding surface. The first convex portion and the second convex portion are in the ring body in a closed state where the first convex portion and the second convex portion overlap each other. The dimension is set so that it does not protrude from the contour line of the cross section.

The ring body in the open state has a portion with a maximum radius of curvature within a range of 180 ° ± 30 ° with respect to the center point of the cut, and the first end portion extends from the portion with the maximum dimension. -It is set so that the radius of curvature decreases as it approaches the circumferential direction toward each of the second ends, and the overall shape is in a closed state where the first and second protrusions overlap each other. It is comprised so that it may become a perfect circle.

In addition, the present invention is an annular shape having a cut at one place on the circumference, and includes a ring main body, a first convex portion protruding in the circumferential direction from the first end portion and the second end portion of the ring main body, In a seal ring having a second convex portion and disposed at a corner portion formed by two orthogonally sealed surfaces to be in pressure contact with the sealed surface to be orthogonal to each other A mark for preventing erroneous mounting is provided in a non-facing region excluding the sealing facing regions facing the two surfaces to be sealed.
Moreover, the whole is injection-molded with the thermoplastic resin composition, and the mark for preventing erroneous mounting is integrally formed by the injection molding.
Moreover, the 3rd convex part for 1st convex part damage prevention is protrudingly provided in the circumferential direction from the said 1st edge part on the said scraping part side.

According to the seal ring of the present invention, the sealing performance at the joint portion of the first convex portion and the second convex portion can be improved, and fluid leakage can be reduced. By injection molding of the thermoplastic resin composition, the dimensions can be easily set, and a high-quality and high-performance seal ring can be obtained easily and inexpensively. Machining such as cutting / grinding / cutting can be omitted, the occurrence of material loss is reduced, and manufacturing can be performed at low cost. In particular, it is possible to provide a seal ring suitable for a compressor that performs a scrolling motion.

According to the seal ring provided with the erroneous mounting prevention mark of the present invention in the non-facing region, the operator confirms the erroneous mounting prevention mark and against the corner formed by two orthogonally sealed surfaces. Therefore, it can be installed without mistakes with a normal seal ring posture. In addition, the mark for preventing erroneous mounting does not exist in the opposing area for sealing, and there is no influence on the functional surface (seal performance) of the seal ring.
According to the seal ring in which the third convex portion protrudes from the first end on the side of the scraping portion, the first convex portion is protected by the third convex portion, and the sealing performance is always stably exhibited. That is, the first protrusion is extremely small compared to the entire ring body, and when it collides with another object or falls to the floor, there is a high possibility of being damaged such as cracks or breakage due to its material. However, it can be said that the very small first convex portion is protected by the third convex portion of the present invention, and the above-mentioned damage can be prevented.

It is a compressor sectional view which illustrated the use of the seal ring concerning the present invention concretely. It is the expanded sectional view which showed the 1st Embodiment of this invention and showed the use location. It is a top view of a break open state. It is a front view of a cut open state (illustrated with a part of the rear portion omitted). It is a top view of a break closed state. It is a front view of a break closed state. It is an expanded sectional view showing a modification of ring main part 1. FIG. 5 is an enlarged sectional view taken along line BB in FIG. FIG. 5 is an enlarged sectional view taken along the line CC of FIG. 4 and an enlarged sectional view showing a modification. FIG. 7 is a DD enlarged cross-sectional view of FIG. 6 and an enlarged cross-sectional view showing a modification. It is a principal part expanded sectional view which shows a pressure receiving state. It is sectional drawing which showed the 2nd Embodiment of this invention. It is a top view of a break closed state. It is a principal part enlarged plan view. It is the top view of the break closed state which showed the modification of the 2nd Embodiment of this invention. It is sectional drawing which showed the 3rd Embodiment of this invention. It is sectional drawing which showed the 4th Embodiment of this invention. It is sectional drawing which showed the 5th Embodiment of this invention. It is sectional drawing which showed the 6th Embodiment of this invention. It is sectional drawing which showed 6th Embodiment and 7th Embodiment. It is principal part sectional drawing for demonstrating a various modification. It is principal part sectional explanatory drawing which shows another modification. It is the expanded sectional view which showed the 8th Embodiment of this invention and showed the use location. It is the expanded sectional view which showed each principal part. It is an expanded sectional view of each important part showing a 9th embodiment. It is a principal part expanded sectional view of one modification. It is a principal part expanded sectional view of the other modification. It is a principal part expanded sectional view which shows various other modifications. It is a principal part expanded sectional view which shows various other modifications. It is a principal part expanded sectional view which shows a pressure receiving state. It is a principal part expanded sectional view which shows a pressure receiving state. It is a 10th Embodiment of this invention and is an expanded sectional view of a mounting state. It is a top view which shows a break open state. It is a front view of a cut open state (illustrated with a part of the rear portion omitted). It is a bottom view of a break closed state. It is a principal part expanded sectional view which showed the various modifications. It is a principal part expanded sectional view which showed the various modifications. It is an expanded sectional view explaining an example of a built-in (mounting) state. It is an expanded sectional view explaining other examples of a built-in (mounting) state. It is a principal part expanded sectional view which showed the various modifications. It is an expanded sectional view explaining 11th Embodiment of a built-in (mounting) state. It is the principal part expanded sectional view which showed another various modification. It is explanatory drawing which shows the principal part of 12th Embodiment, (A) is principal part expanded sectional explanatory drawing, (B) is principal part enlarged perspective explanatory drawing. It is the principal part expanded sectional view of a break closed state, and the principal part expanded sectional view which shows a modification. FIG. 45 is an enlarged cross-sectional view showing a thirteenth embodiment instead of FIG. 44 and its modification example. It is a principal part expanded sectional view which shows a pressure receiving state. It is sectional drawing which showed the 14th and 15th embodiment of this invention. It is an expanded sectional view showing various modifications. It is a principal part expansion perspective view corresponding to FIG. 48 (A).

Hereinafter, the present invention will be described in detail based on the first embodiment shown in FIGS. 1 to 11 and its modifications.
As shown in FIGS. 3 and 4, the seal ring S of the present invention has an annular overall shape having a cut 5 at one place in the circumference in a free state. The seal ring S includes a ring main body 1 occupying a central angle slightly smaller than 360 °, and the first convex portion 21 and the first convex portion 21 in the circumferential direction from the first end portion 11 and the second end portion 12 of the ring main body 1. Two convex portions 22 are provided so as to project.
FIGS. 1 and 2 show the state of use, and exemplifies a case where the present invention is applied to a scroll compression mechanism 3 of a compressor 2 for an air conditioner.

The scroll compression mechanism 3 mainly includes a housing 4, a fixed scroll 6 disposed in close contact with the upper side of the housing 4, and a movable scroll 7 that meshes with the fixed scroll 6. In the housing 4, a seal groove 4 </ b> B is formed in a flat surface portion 4 </ b> A facing the lower surface (back surface) 7 </ b> A of the movable scroll 7, and the seal ring S of the present invention is inserted in the seal groove 4 </ b> B.
The seal ring S seals between the back surface 7A of the movable scroll 7 and the flat portion 4A of the housing 4 to form a back pressure space. (FIG. 2 is an enlarged view of a Y portion in FIG. 1.)

Then, as shown in FIG. 3 and FIG. 4, the thermoplastic resin composition is integrally formed in the entire shape in which the cut 5 is open. In FIG. 3, arrow F indicates the injection direction of the molten resin at the time of injection molding, 10 is an injection gate (trace) portion, and even if it is cut as beautifully as possible with a cutting blade (not shown), There is a possibility that minute protrusions may remain, and machining such as grinding may be performed for finishing. However, except for such an injection gate trace portion 10, machining can be omitted to form an injection molding surface.

A thermoplastic resin composition suitable for injection molding the seal ring S of the present invention may include a PES resin composition. The injection-molded product has the advantage that so-called burrs are less likely to occur. Furthermore, the thermal expansion coefficient is low, the shrinkability after taking out from the mold is low, and the size of the seal ring S is maintained with high accuracy, so that the above-mentioned machining can be performed. There is an advantage that it can be omitted.

Then, as shown in FIG. 3, the cut line 5 is integrally formed with a thermoplastic resin composition such as a PES resin composition in the entire shape in the open state, but the cut line 5 taken out from the injection mold. The ring body 1 of the seal ring S in the open state has a portion 13 having the maximum radius of curvature R ₁₃ (maximum size) on the side opposite to the cut 5, and the first end from the portion 13 having the maximum dimension. The radius of curvature R ₁ , R ₂ gradually decreases toward each of the portion 11 and the second end portion 12 in the circumferential directions M ₁ and M ₂ , and the first end portion 11 and the second end portion 12. The radius of curvature R ₁₁ , R ₁₂ of the first convex portion 21 and the second convex portion 22 (which are small projecting dimensions) are set to be the minimum dimension, and the curvature radii of the outer peripheral surfaces of the first convex portion 21 and the second convex portion 22 are R ₁₁ , R Same as ₁₂ .
The curvature radii R ₁₃ , R ₁ , R ₂ , R ₁₁ , R ₁₂ are the dimensions from the center point O ₁ to the outer peripheral surface of the ring body 1 as shown in FIG.

Further, in addition, in the plan view of FIG. 3, the ring body 1 in the open state has a maximum dimension within a range of 180 ° ± 30 ° with respect to the central point (center point) P ₅ of the cut 5. The site | part 13 exists. That is, θ shown in FIG. 3 is 30 °, and the portion 13 having the maximum dimension is disposed in the range of 2θ = 60 °. (In FIG. 3, L ₀ is a line indicating the diameter including the center point P _5. )

As described above, the shape and size of the cavity of the mold and the seal ring S (see FIG. 3) taken out from the cavity have an outer peripheral edge shape of ± θ (= ± on the opposite side of 180 ° with respect to the cut 5. A portion 13 having a maximum radius of curvature R ₁₃ is disposed within a range of 30 °), and is set to a non-circular shape that gradually decreases from this portion 13 toward the cut 5.
In the state of use --- the state of being attached to the seal groove 4B as shown in FIG .---- the first convex portion 21 and the second convex portion 22 overlap each other, and the cut is closed, but the cut is opened. Due to the above-mentioned non-circular shape under the state, it becomes a true circular shape with the same radius of curvature R ₀ from the center point O ₁ due to elastic deformation, and the inside of the seal groove 4B shown in FIG. Close contact with the wall surface 14. When deformed from the cut open state (FIG. 3) to the cut closed state (FIG. 5), the portion 13 having the largest dimension is deformed so that the radius of curvature is the largest, and the first end portion 11 and the second end portion 12 side. Hardly deforms. Therefore, the curvature radius R ₀ shown in FIG. 5 is equal to the curvature radii R ₁₁ and R ₁₂ of the end portions 11 and 12 shown in FIG.

The cross-sectional shape of the ring main body 1 is a rectangular shape as an example. In the present invention, the “rectangular shape” includes, of course, the squares and rectangles shown in FIGS. 2, 9 (A), 10 (A), etc. As shown in FIG. 10B, one corner ₁₅ is chamfered from the basic rectangle G by an inclined straight line L ₁₅ , and one of the remaining corners other than the corner 15 is omitted although not shown. Including a polygonal shape with chamfered portions or all of them, and a shape having a shallow groove-like notch portion 29 as shown in FIGS. 12 to 16 and 18, and FIGS. ) Is defined to include a shape having the small rounded portion 35 shown in (1) in at least one of the four corners.
In the state of use shown in FIG. 2, the first sliding contact surface 26 slidably contacting the (movable side) sealed surface (plane) P ₁ such as the back surface 7A of the movable scroll 7 and the inner wall surface 14 of the seal groove 4B (fixed) and a second sliding contact surface 27 in sliding contact with the side) the sealing surface (curved surface) P _2, it has. It is pressed against the corner 8 formed by the surfaces to be sealed P ₁ and P _{2 which} are orthogonal in cross section when receiving pressure.

By the way, the present invention adopts a thermoplastic resin composition such as a PES resin composition, so that the cross section shown in FIG. 2 or the like is made square or rectangular (even if chamfering is omitted), or during the scroll motion. There is an advantage that the corner portion 15 of the seal ring S does not cause a problem such as biting into the gap 9 between the back surface 7A and the flat surface portion 4A. However, it is sometimes preferable to form the chamfered portion 16 shown in FIG. 7 or the like in consideration of severe conditions of use such as pressure, temperature, motion speed / operation direction, and fluid characteristics. By adding describes cross-sectional shape formed with the chamfered portion 16, as shown in FIG. 7, the one corner portion 15 from the basic rectangle G shown in two-dot chain line is chamfered by the inclined shape linear L _15. (FIG. 7 illustrates C chamfering.)

As shown in FIG. 8, the first convex portion 21 includes a first contact piece portion 31 having one corner portion 19 of the basic rectangle G adjacent to the one corner portion 15 (shown in FIG. 7), and the other It has the 2nd contact piece part 32 which has the corner | angular part 17, and the 1st contact piece part 31 and the inclined piece part 30 which connects the 2nd contact piece part 32 (thin-wall shape).
The 1st convex part 21 is formed in the cross-sectional shape [the shape (tortoise bracket shape) bent at two places. The inclined piece 30 has an inclined corresponding surface 23 on the outer side of the turtle bracket ([), and a recess 33 having a bottom surface 25 on the inner side. The thickness T ₁ of the inclined piece 30 is a dimension that can ensure strength and rigidity, and at the same time, give appropriate flexibility and ensure a sufficient amount of deformation in the pressure receiving state.

As shown in FIGS. 9 (A) and 9 (C), the second convex portion 22 has a triangular cross-sectional shape, and has a sharp top at right angles in FIG. 9 (A), and in FIG. 9 (C). It is a triangle having a small rounded portion 35 at the top. In FIG. 9B, the cross-sectional shape of the second convex portion 22 is formed in a trapezoidal shape, and has a chamfered portion 16 in which the top of the triangle shown in FIG. 9A is chamfered.
9A, 9B, and 9C each have an inclined surface 24 on the bottom side (lower base). Then, as shown in FIGS. 10A and 10B, in the closed state where the first convex portion 21 and the second convex portion 22 overlap each other, the triangular or trapezoidal inclined surface 24 has the inclined piece portion 30. Face to the corresponding slope 23 (in parallel). The trapezoidal cross-sectional shape is not limited to the case where the chamfered portion 16 and the inclined surface 24 are parallel as shown in the figure, but also includes the case where the chamfered portion 16 and the inclined surface 24 are not truly parallel. Note that FIG. 10A corresponds to FIG. 9A, FIG. 10B corresponds to FIG. 9B, and the triangle indicated by the two-dot chain line in FIG. (C) corresponds.

What has been described above with reference to FIGS. 8, 9, and 10 will be described with another expression. The ring body 1 has a rectangular cross-sectional shape, and the first convex portion 21 and the second convex portion 22 have a rectangular cross-section of the ring main body 1 as shown in FIG. The first corresponding surface 41 (the inclined corresponding surface 23) and the second corresponding surface 42 (the inclined surface 24) correspond to each other. Further, the first convex portion 21 has a scraped portion (concave portion) 33 formed on the opposite surface side of the first corresponding surface 41.

As shown in FIGS. 5 and 6, in the closed state where the first convex portion 21 and the second convex portion 22 overlap each other, the first convex portion 21 and the second convex portion 22 are The dimensions of the cross sections of the first convex portion 21 and the second convex portion 22 are set to dimensions that do not protrude from the basic rectangle G shown in FIG.
Against radial dimension H ₂₃ · Axial dimension T ₂₃ inclined corresponding surfaces 23 (first corresponding surface 41) of the first convex portion 21 shown in FIG. 8, FIG. 9 (A) (B) (C) The radial dimension H ₂₄ and the axial dimension T ₂₄ of the inclined surface 24 (second corresponding surface 42) of the second convex portion 22 are set to be slightly smaller. In this manner, the first convex portion 21 and the second convex portion 22 are set to dimensions (dimension tolerance) that do not protrude from the outline of the cross section of the ring body 1 in the closed state.

That is, as shown in FIG. 10, when the first convex portion 21 and the second convex portion 22 overlap (coincide with) the four sides of the basic rectangle G in FIG. ) A minute seal gap g is formed between the inclined corresponding surface 23 and the inclined surface 24 (of the second convex portion 22). The maximum dimension of the seal gap g is desirably set to 10 μm or more and 100 μm or less. That is, it is desirable that 10 μm ≦ g ≦ 100 μm. When the seal gap g exceeds 100 μm, fluid leakage increases rapidly.
In this way, the corresponding two surfaces 23 and 24 (first and second) are closed so that the first convex portion 21 and the second convex portion 22 overlap the four sides of the basic rectangle G. Since the maximum gap dimension is set to 10 μm or more and 100 μm or less with the seal gap g of the corresponding surfaces 41 and 42 being maximized, the corresponding two surfaces 23 and 24 (first and second corresponding surfaces 41 and 42). Leakage can be suppressed, and the first convex portion 21 and the second convex portion 22 do not protrude from the basic rectangle G, and the sealing performance can be further improved.

As shown in FIG. 11, in the pressure receiving state, the seal ring S is pressed against the corner portion 8 formed by the sealed surface (plane) P ₁ and the sealed surface (curved surface) P ₂ , and the pressure P _{0 of the} fluid L The first convex portion 21 is elastically deformed and pressed against the second convex portion 22.
As the movable scroll 7 performs a scrolling motion, the first sliding contact surface 26 and the second sliding contact surface 27 come into contact (pressure contact) with the mating member --- the sealed surface P ₁ and the sealed surface P ₂ --- The first convex portion 21 is pressed against the second convex portion 22 by the pressure P _{0 of the} fluid L. When the first convex portion 21 presses the second convex portion 22, the sealing performance between both the first convex portion 21 and the second convex portion 22 is improved, and the leakage of the fluid L from the seal gap g is prevented. Decrease. As is clear from FIG. 10, a first sliding contact surface 26 and a second sliding contact surface 27 having a continuous surface are formed on the first convex portion 21 and the second convex portion 22. In the present invention, the first slidable contact surface 26 and the second slidable contact surface 27 (as described above) can be used as they are as the injection-molded surfaces omitted from machining, and in accordance with JIS B 0601. The arithmetic average roughness (Ra) of the measured surface is set to 0.1 or more and 2.0 or less to exhibit excellent sealing performance and wear resistance.

In the present invention, the thermoplastic resin composition to be injection-molded may have a flexural modulus of 1500 MPa or more and 6000 MPa or less. For example, a polysulfone resin composition, specifically, PES (polyether A sulfone resin composition, a PSU (polysulfone) resin composition, and a PPSU (polyphenylsulfone) resin composition are preferable. In particular, the flexural modulus is preferably 2000 MPa or more and 4000 MPa or less.
The PES resin composition suitable for the seal ring according to the present invention is a PES resin composition obtained by adding a compound having a layered crystal structure such as graphite powder and / or a fluororesin powder to the PES resin. Such addition makes it easy to adjust the characteristics within the above-mentioned range of bending elasticity, excellent wear resistance as a seal ring, good heat and chemical resistance, sufficient stretchability, wearability and It also has good sealing properties and is suitable for the air conditioner compressor exemplified in FIG.
Other thermoplastic resin compositions include polyarylene sulfide-based resin compositions, specifically, compounds having a layered crystal structure such as the above-described graphite powder in PPS (polyphenyl sulfide) resin, fluororesin powder, A PPS resin composition to which a fibrous filler such as glass fiber or carbon fiber is added can also be applied.

In the present invention, since the thermoplastic resin composition can be manufactured by injection molding, the dimensional tolerance can be easily set (at the mold cavity stage) such that H ₂₄ ≦ H ₂₃ and T ₂₄ ≦ T _23. .
Although not shown in the figure, if H ₂₄ > H ₂₃ and T ₂₄ > T ₂₃ are set, a seal ring is formed at the corner 8 formed by the sealed surface P ₁ and the sealed surface P ₂ in the use state. S is pressed. At this time, the second convex portion 22 is in close contact with both surfaces P ₁ and P ₂ , but the first convex portion 21 is in contact with only one of the surfaces to generate an external leakage gap, thereby preventing fluid leakage. Arise. In the present invention, such a problem is set to H ₂₄ ≦ H ₂₃ and T ₂₄ ≦ T ₂₃ (as described above), and the first convex portion 21 and the second convex portion 22 overlap each other. It is configured and prevented from protruding from the basic rectangle G in a closed state.

Next, a second embodiment of the present invention shown in FIGS. 12 to 14 will be described.
As shown in FIG. 12, the cross-sectional shape of the ring body 1 is the above-described rectangular shape, and in the case of the rectangle (square) shown by the solid line in FIG. the (by inclined straight line L ₁₅ as shown in FIG. 7) the chamfered portion 16 notching a polygonal shape having as two-dot chain line, (sliding use state shown in FIG. 2 to the movable side the sealing surface P ₁ The first slidable contact surface 26 in contact has frictional resistance reducing means 28.
The ring main body 1 is formed with a shallow groove-shaped notch 29 as a frictional resistance reducing means 28 which is not in contact with the sealed surface P ₁ by notching the corner 19 of the basic rectangle G. By forming the shallow groove-shaped notch 29 in the first sliding contact surface 26, the oil in the sealed fluid enters between the first sliding contact surface 26 and the sealed surface P ₁ (see FIG. 2). The sliding property with the sealed surface P ₁ is improved. Thus, the shallow groove-like notch 29 is a notch for reducing frictional resistance. In the cross section of FIG. 12, when the chamfered portion 16 has a two-dot chain line, the width dimension W ₁ of the first sliding contact surface 26 is 10% to 50% of the width dimension W ₂ of the second sliding contact surface 27. %, More preferably 15% to 30%. When the width W ₁ of the first sliding contact surface 26 is less than the lower limit value, there is a possibility that the sealing performance decreases, exceeds the upper limit, sliding of the first sliding contact surface 26 is insufficient, when the swing Becomes unstable, the joint portion of the first convex portion 21 and the second convex portion 22 is changed, and the leakage amount of the fluid L is increased.

As shown in FIG. 13 and FIG. 14, the shallow groove-shaped notch 29 is continuous in the circumferential direction over a central angle range slightly smaller than 360 ° excluding the first end 11 and the second end 12 of the ring body 1. Is formed. In the first end portion 11 and the second end portion 12, the cutout portion 29 is formed, so that the first convex portion 21 is not in contact with the sealed surface P ₁ , and the above-described fluid leakage occurs. Since a problem occurs, the first sliding contact surface 26 of the first convex portion 21 remains.

As in the modification shown in FIG. 15, a plurality of shallow groove-like notches 29 are circumferentially arranged in a central angle range slightly smaller than 360 ° excluding the first end portion 11 and the second end portion 12 of the ring body 1. It may be formed intermittently.
In FIG. 16, the shallow groove-shaped notch 29 is disposed at the intermediate position in the width direction of the first sliding contact surface 26 while leaving the corner portion 19 of the basic rectangle G. Note that, as in the fourth embodiment shown in FIG. 17, the first sliding contact surface 26 is covered with a material having a lower coefficient of friction than the other part (second sliding contact surface 27) of the seal body 1. Also good. Alternatively, although not shown, the first sliding contact surface 26 may be provided with irregularities. In this way, the sliding property of the first sliding contact surface 26 is improved.

Next, as in the fifth embodiment shown in FIG. 18A, the ring body 1 forms a notch 20 by notching the other corner 18 of the basic rectangle G that is the opposite of the corner 15. You may do it. This notch portion 20 can also be called a shaving portion. The cutout 20 is preferably formed in the same shape as the concave portion (cut-off portion) 33 of the first convex portion 21 shown in FIG. With this configuration, the mold can be easily manufactured and the cost can be reduced. Moreover, since the notch part 20 (and the recessed part 33 of the 1st convex part 21) is formed at the time of the injection molding of a thermoplastic resin composition, it does not require machining, and also has the cross-sectional shape shown in FIG.7 and FIG.12. Compared with the ring main body 1, it is possible to save the thermoplastic resin composition and to keep the material cost low. In FIG. 18A, the corner portion 19 of the basic rectangle G is cut away to form a shallow groove-like cutout portion 29, and the frictional resistance of the first sliding contact surface 26 is reduced.
Further, as in the modification shown in FIG. 18B, a rounded portion 29A having a small curvature radius R ₂₉ may be formed at the corner of the shallow groove-like notch 29 as the frictional resistance reducing means 28 (due to stress concentration). Desirable for crack prevention). Alternatively, a thin triangular cutout portion 29 may be used as the shallow groove cutout portion 29 as in another modification shown in FIG.

19 and 20A are cross-sectional views showing a sixth embodiment of the present invention.
In FIG. 19, in the ring body 1, the basic rectangle G is a rectangle, and the side (short side) forming the first sliding contact surface 26 is shorter than the side (long side) forming the second sliding contact surface 27. That is, (used in sliding contact with the movable side to be sealed surface P ₁ At a state) frictional resistance of the first sliding contact surface 26 is reduced, which improves the sliding property. The other corner 18 of the basic rectangle G that is the opposite of the one corner 15 is cut out to form a cut-off portion (notch) 20.
As shown in FIG. 20A, the second convex portion 22 has a triangular cross-sectional shape, and the first convex portion 21 is an inclined surface of one side of the square of the second convex portion 22. 24 has an inclined piece 30 having an inclined corresponding surface 23 parallel to 24. The inclined piece part 30 has an inclination corresponding surface 23 on the outer side, and a cut-out part 33 continuous with the notch part 20 of the ring body 1 is formed on the inner side.

FIG. 20B shows a seventh embodiment. As shown in FIG. 20B, the first convex portion 21 has a slope-corresponding surface 23 on the outer side, and in particular, an arc-shaped curve on the inner side. A scraping portion (concave portion) 33 is formed. Further, the arcuate curved cut-out portion 33 forms the first abutment piece 31 and the second abutment piece 32 of the first convex portion 21 so that the thickness dimension is locally increased. 20B, the cross-sectional shape of the ring body 1 is cut out from the basic rectangle G (not shown), but the arcuate curved cut-out portion 33 is formed from the basic rectangle G (not shown). It is also desirable that the cutout portion 20 and the scraping portion 33 of the ring body 1 are continuous as the shape. In FIG. 20A, the same operation and effect as described above can be obtained.

Next, various modifications shown in FIG. 21 will be described.
In FIG. 21, the cross-sectional area of the first convex portion 21 decreases in the order of (A), (B), and (C). In other words, the case where the thickness dimension T ₁ is set to be smaller in the order of (A), (B), and (C) is shown. Speaking from the strength, it becomes weaker in the order of (A), (B), and (C), but the inclined corresponding surface 23 of the first convex portion 21 is elastically deformed with respect to the inclined surface 24 of the first convex portion 21 when pressure is received. It becomes easy to be pressed. Judging from both aspects of strength and ease of pressing, it can be said that it is preferable in order of (A), (B), and (C) in FIG. _{21A and} 21B, it is possible to form the bottom surface 25 in a non-parallel manner with respect to the inclination corresponding surface 23 as indicated by a one-dot chain line L21.
Note that the cross-sectional shape of the ring body 1 having the first convex portion 21 and the second convex portion 22 shown in FIGS. 21A, 21B, and 21C in a protruding shape is omitted in the drawing, but FIG. Then, the ring body 1 can be formed in a rectangular shape or a shape having a notch (cutting portion) 20 along the bottom surface 25 (see FIG. 18A). However, for FIGS. 21B and 21C, if the same contour shape is used, the cross section of the ring body 1 becomes excessively small and the posture during use becomes unstable. .

Next, since FIG. 21D has already been described with reference to FIGS. 10 and 11, description thereof is omitted here.
FIG. 21E shows a case where the cross-sectional shape of the concave portion 33 is formed in a curved arc shape, and it is also desirable that the concave portion 33 be a quarter circle. Judging from both the strength of the first convex portion 21 and the ease of being pressed against the inclined surface 24 of the first convex portion 21 (appropriate flexibility), FIGS. 21 (D) and (E) It is practically preferable to FIGS. 21A, 21B, and 21C.
And as a cross-sectional shape of the ring main body 1 having FIGS. 21D and 21E, a cut-out portion (cutting portion) 20 having a rectangular shape or having the same cross-sectional shape as the concave portion 33 (FIG. 18 ( The shape having A) is also freely selectable.

By the way, in each of the embodiments and modifications already described with reference to FIGS. 18 to 21 and the like, the cross-sectional shape of the ring body 1 is not the rectangular shape but the other corner portion 18 of the basic rectangle G. Is a shape in which the cutout portion 20 is formed by cutting the first convex portion 21, and the cutout portion 33 and the cutout portion 33 are continuous. It is desirable from the viewpoint of injection molding and not causing stress concentration. However, the term “continuous” in the present invention is not limited to the shapes of the scraping portion 33 and the cutout portion 20, and includes cases where they are continuous as shapes similar to each other.

Next, FIG. 22 shows a plurality of other modified examples. In FIGS. 22A and 22B, the first convex portion 21 and the second convex portion 22 are the same as those shown in FIGS. 20 and 21 described above. A case is shown in which two parts are divided by an L-shaped separation line Lc (instead of such a linear separation line Lc). In other words, the first convex portion 21 has a rectangular or square cutaway portion 16A having a rectangular cross section, and the second convex portion 22 has a rectangular or square cross sectional shape that fits into the cutout portion 16A. The first and second corresponding surfaces 41 and 42 are L-shaped in cross section. 22A, the scraping portion 33 of the first convex portion 21 is L-shaped. In FIG. 22B, the scraping portion 33 is a pentagon (shown by a solid line) or “1”. For example, a rectangle indicated by a chain line. Although not shown, the cross-sectional shape of the ring main body 1 corresponding to FIG. 22A or 22B is a rectangular shape and a shape having a cutout portion 20 that is the same or similar to the scraping portion 33. A case may be considered.

In the modification shown in FIGS. 22C and 22D, the first convex portion 21 and the second convex portion 22 are divided into two by a semicircular arc-shaped separation line Lc. That is, the cross-sectional shape of the first convex portion 21 has a four semicircular cutout portion 16B at one corner, and the second convex portion 22 has a four semicircular shape that fits into the cutout portion 16B. In FIG. 22C, the scraped portion 33 of the first convex portion 21 is a diamond type composed of an arc portion 36 having a large radius along the arc-shaped separation line Lc and short straight portions 37 and 37 at both ends thereof. It is. FIG. 22D illustrates the case where the scraping portion 33 is a triangle.
Although not shown, the cross-sectional shape of the ring main body 1 corresponding to FIGS. 22C and 22D has a rectangular shape and a shape having a notch 20 that is the same as or similar to the scraping portion 33. There is a case.
In any of the modifications of FIGS. 22A, 22B, C, and D, the first corresponding surface 41 and the second corresponding surface 42 are parallel to each other. Draw an L-shape or a quarter-circle shape with a constant small dimension.

The use method (action) of the above-described seal ring of the present invention will be described.
As shown in FIG. 11, the seal ring S is pressed against the movable scroll 7 and the corner portion 8 of the housing 4 in the pressure receiving state, and the second convex portion 22 corresponds to the inner portion of the corner portion 8. In the seal ring S, the first slidable contact surface 26 is in slidable contact (pressure contact) with the movable side sealed surface P ₁ of the movable scroll 7 that scrolls, and the second slidable contact surface 27 is fixed with the fixed side sealed surface of the housing 4. sliding contact (pressure contact) to the plane P _2. In the first convex portion 21, the inclined piece portion 30 is pressed against the inclined surface 24 of the second convex portion 22 by the pressure P _{0 of the} fluid L, and between the first convex portion 21 and the second convex portion 22. Sealability is improved. In this way, fluid leakage from the joint portion of the first convex portion 21 and the second convex portion 22 is reduced. It should be noted that fluid leakage is not allowed at all at the place where the seal ring S is used in the compressor, and the seal ring S of the present invention has the same level of sealing performance as the current PTFE seal ring. Required. That is, it is not preferable that the seal ring S has excessive fluid leakage (compared to the PTFE seal ring), but it is also not preferable that fluid leakage be excessive. In view of this, the seal ring S of the present invention, as described in detail with reference to FIGS. 21 (A) to (E), changes the thickness dimension T ₁ and the shape of the first convex portion 21 so that the The deformation amount (easiness of deformation) of one convex portion 21 can be adjusted.

As shown in FIGS. 12 and 16 to 18, a shallow groove-like notch 29 is provided to reduce (reduce) the frictional resistance of the first sliding contact surface 26 that is in sliding contact with the movable-side sealed surface P ₁ . Accordingly, the seal ring S is held in a stable posture at the movable scroll 7 and the corner 8 of the housing 4, and the sliding (sliding) between the sealed surface P ₁ of the movable scroll 7 and the first sliding contact surface 26 is performed. It can stabilize and can suppress the change of the joint part of the 1st convex part 21 and the 2nd convex part 22.

Although already described in FIGS. 20 and 21, the present invention can be modified in design, and the first convex portion 21 can be deformed so as to be convex toward the second convex portion 22. The shape may be any shape, and the inclination corresponding surface 23 and the bottom surface 25 may not be parallel, and the bottom surface 25 may be curved in an arc shape.

As described above with reference to FIGS. 1 to 22, the seal ring according to the present invention is formed in an annular overall shape having a cut 5 at one circumference, and includes a ring body 1 and the ring body 1. In the seal ring having the first convex portion 21 and the second convex portion 22 projecting from the first end portion 11 and the second end portion 12 in the circumferential direction, the whole is integrated with the thermoplastic resin composition. The ring main body 1 has a rectangular cross-sectional shape, and the first convex portion 21 and the second convex portion 22 have a rectangular cross-section of the ring main body 1 separated by a separation line Lc. The first corresponding surface 41 and the second corresponding surface 42 are divided to face each other, and the first convex portion 21 has a cross-sectional shape in which a scraping portion 33 is formed on the opposite surface side of the first corresponding surface 41. The first convex portion 21 and the second convex portion 22 are overlapped with each other. Then, since the first convex portion 21 and the second convex portion 22 are set to dimensions that do not protrude from the outline of the cross section of the ring body 1, the first convex portion 21 and the second convex portion 22 The sealing performance at the joint portion of the two convex portions 22 can be improved, and fluid leakage can be reduced. In injection molding of a thermoplastic resin composition, dimensional tolerance can be easily set, and a high-quality and high-performance seal ring can be obtained easily and inexpensively. Machining such as cutting / grinding / cutting can be omitted, material loss is reduced, and manufacturing can be performed at low cost.

Further, the ring body 1 is formed in an annular overall shape having a cut 5 at one circumference, and the ring body 1 and the first end portion 11 and the second end portion 12 of the ring body 1 are protruded in the circumferential direction. In the seal ring having the first convex portion 21 and the second convex portion 22, the whole is integrally formed of a thermoplastic resin composition, and the cross-sectional shape of the ring body 1 is the movable side sealed surface P _1. And the corner 15 of the basic rectangle G corresponding to the corner 8 of the fixed-side sealed surface P ₂ , the other corner 18 of the basic rectangle G as a diagonal is cut away to form a notch 20. The first convex portion 21 and the second convex portion 22 divide the cross section of the ring body 1 having the cross section having the notch portion 20 into two by the separation line Lc. The first convex portion 21 is continuous with the notch portion 20 of the ring body 1 with the second corresponding surfaces 42 facing each other. The first convex portion 21 and the second convex portion are in a cross-sectional shape in which a shaped scraping portion 33 is formed, and the first convex portion 21 and the second convex portion 22 are in a closed state where the first convex portion 21 and the second convex portion 22 overlap each other. Since the portion 22 is configured to have a dimension that does not protrude from the basic rectangle G, the sealing performance at the joint portion of the first convex portion 21 and the second convex portion 22 can be improved, and fluid leakage can be reduced. . In injection molding of a thermoplastic resin composition, dimensional tolerance can be easily set, and a high-quality and high-performance seal ring can be obtained easily and inexpensively. Machining such as cutting / grinding / cutting can be omitted, material loss is reduced, and manufacturing can be performed at low cost. The posture at the time of sliding is stabilized, the fluctuation of the joint portion of the first convex portion 21 and the second convex portion 22 can be suppressed, and the fluid leakage can be prevented from becoming excessive. The material cost can be kept low by saving the thermoplastic resin composition. In addition, the lifetime is increased.

Further, the first sliding contact surface 26 with which the ring body 1 is in sliding contact with the movable-side sealed surface P ₁ includes the shallow groove-shaped notch 29 for reducing the frictional resistance, so that the posture during sliding is stable. The fluctuation of the joint portion of the first convex portion 21 and the second convex portion 22 can be suppressed, and the fluid leakage can be prevented from becoming excessive. Furthermore, there is an advantage that the lifetime is long.
Further, the first sliding contact surface 26 with which the ring body 1 is in sliding contact with the movable-side sealed surface P ₁ is formed by covering with a material having a low friction coefficient so as to reduce the frictional resistance. The posture at the time of movement is stabilized, the fluctuation of the joint portion of the first convex portion 21 and the second convex portion 22 can be suppressed, and the fluid leakage can be prevented from becoming excessive. Furthermore, there is an advantage that the lifetime is long.

The ring body 1 in the open state has a portion 13 having a maximum radius of curvature R ₁₃ within a range of 180 ° ± 30 ° with respect to the center point P _{5 of the} cut line 5. To the first end portion 11 and the second end portion 12, the curvature radii R ₁ and R ₂ are set so as to decrease as they approach the circumferential directions M ₁ and M _2. 21 and the second convex portion 22 are configured so that the overall shape is a perfect circle in the closed state where the second convex portion 22 overlaps with each other. Under the use condition where 21 and the 2nd convex part 22 overlap, it becomes a perfect circle and exhibits the outstanding sealing performance (sealability) with respect to a circular internal peripheral surface.

Next, FIGS. 23 and 24 show an eighth embodiment of the present invention. FIG. 23 is a drawing replacing FIG. 2 described above, and FIG. 24 is a drawing schematically corresponding to FIG. 8, FIG. 9, FIG.
1, 2, and 3 to 6, the configuration and operation already described are the same as those in the embodiment shown in FIGS. 23 and 24, and therefore, redundant description is omitted. The different configurations and functions will be mainly described.
As shown in FIGS. 23 and 24A, the cross-sectional shape of the ring body 1 is circular. Then, in a use state shown in FIG. 23, the rear 7A such of the movable scroll 7 and the first sliding contact portion 26A in sliding contact with the (movable side) the sealing surface P _1, the seal groove 4B inner wall surface 14 or the like (the fixed side ) and a second sliding contact portion 27A which slides over the sealing surface P _2, has. It is pressed against the corner 8 formed by the sealed surfaces P ₁ and P ₂ which are orthogonal in the cross section when receiving pressure. The first and second sliding contact portions 26A and 27A are in contact with the respective sealed surfaces P ₁ and P ₂ in a linear shape as a whole, but when the pressure is high or wear occurs, a thin strip shape is formed. To touch.

By the way, the present invention employs a thermoplastic resin composition such as a PES resin composition, and has a circular cross section, so that the seal ring S has a gap between the back surface 7A and the flat surface portion 4A during the scroll motion. 9 has an advantage that troubles such as biting do not occur.
And as shown in FIG. 24, the 1st convex part 21 and the 2nd convex part 22 divide the circular cross section of the ring main body 1 into two by the separation line Lc, as shown to the same figure (B). The first corresponding surface 41 and the second corresponding surface 42 face each other. Specifically, from a circular center point O ₂₀ , an arc and a string connecting two points 38 and 39 where two orthogonal axes (x axis and y axis) having a center angle β of 90 ° intersect the circular outline G ′. The cross-sectional shape of the 2nd convex part 22 is set to the arcuate shape formed by surrounding.

On the other hand, as shown in FIG. 24B, the shape of the cross section of the first convex portion 21 is set so as to form a minute seal gap g. That is, the first convex portion 21 and the second convex portion 22 are prevented from protruding from the circular outline G ′ of the cross section of the ring body 1 shown in FIG. The two arcs of the convex portion 22 have dimensions (shapes) that allow them to follow the circular outline G ′, and at that time, a minute seal gap g is formed between the first and second corresponding surfaces 41, 42. It is formed.
In FIG. 24 (B), the separation line Lc is a straight line inclined at 45 °, and the center angle β is 90 °. The second convex portion 22 is in pressure contact (sliding contact) with the sealed surfaces P ₁ and P _{2 in} a stable posture. Moreover, the (thin) arcuate second convex portion 22 is easily elastically deformed in the vicinity of the points 38 and 39 at both ends, and is in pressure contact (sliding contact) with the sealed surfaces P ₁ and P ₂ at the arcuate surface portion. In addition, since both ends of the seal gap g are closed, the sealing performance is maintained.
Further, as shown in FIG. 24D, the central angle β ₄₁ of the first corresponding surface 41 corresponding to the bow-shaped chord corresponding to the first corresponding surface 41 in the first convex portion 21 is 90 It is over °.

In FIG. 24, additional explanation will be given. When the circular convex portion G ′ of the cross section of the ring main body 1 is made to coincide with the arc portions of the first convex portion 21 and the second convex portion 22 so as to overlap, the straight shape A minute seal gap g is formed between the first corresponding surface 41 and the second corresponding surface 42. The seal gap g is desirably set so as to satisfy 10 μm ≦ g ≦ 100 μm. When the seal gap g exceeds 100 μm, fluid leakage increases rapidly. In this manner, fluid leakage from the first and second corresponding surfaces 41 and 42 can be suppressed, and the first convex portion 21 and the second convex portion 22 eat away from the (basic) circular outline G ′. The sealing performance can be further improved.

Next, FIG. 25 shows a ninth embodiment of the present invention. Compared to the above-described eighth embodiment (FIG. 24), the second convex portion 22 is changed from an arcuate shape to a four semicircular shape.
More specifically, the first convex portion 21 and the second convex portion 22 are configured so that the circular cross section (contour line G ′) of the ring body 1 is an L-shaped separation line as shown in FIG. The first corresponding surface 41 and the second corresponding surface 42 are opposed to each other by being divided into two at Lc.
As shown in FIG. 25 (B), the second convex portion 22 extends along the second corresponding surface 42 along two orthogonal axes (x axis, y axis) whose central angle β is 90 ° from the circular center point O _20. And the arc portion corresponds to a central angle β of 90 °.
On the other hand, as shown in FIGS. 25B and 25C, a notch 40 slightly larger than the second convex portion 22 is formed from the circular outline G ′ so as to form a minute seal gap g. The cross-sectional shape of the first convex portion 21 is used. The center angle β ₄₀ of the notch ₄₀ is 90 °.
In the case of such a shape and size, the second convex portion 22 is in pressure contact (sliding contact) with the sealed surfaces P ₁ and P ₂ in a stable posture at the corner portion 8 under the use state shown in FIG. . In particular, since the seal gap g is closed by the sealed surfaces P ₁ and P ₂ (in the cross section), the sealing performance is maintained.
The seal gap g is preferably set in the same numerical range as that of the embodiment shown in FIG.

Next, as in the modification shown in FIG. 26, the ratio of the cross-sectional area of the second convex portion 22 may be set larger than in the case of FIG. That is, if the central angle formed by two straight lines connecting the points 38 and 39 at both ends of the string of the second convex portion 22 and the center point O ₂₀ of the circular cross section is β ₄₂ , 90 ° <β ₄₂ ≦ Set to 150 °.
As shown in FIG. 30A, when the seal ring S is twisted in a state of being pressed against the orthogonally sealed surfaces P ₁ and P ₂ , there is little fluid leakage through the gap g. That's it.

Next, in the modification of FIG. 27, the ratio of the cross-sectional area of the second convex portion 22 is larger than in the case of FIG. In this way, even if the seal ring S is twisted under the same use condition as in FIG. 30B, the leakage of fluid through the gap g can be reduced.
FIG. 28 shows a plurality of modifications of the present invention. The second convex portion 22 is the same as that in FIG. 24 or FIG. 26A, but the first convex portion 21 is different from that already described. That is, in any of FIGS. 28A to 28D, the first convex portion 21 has a cross section in which a scraping portion 33 is formed on the opposite surface side (arc surface side) of the first corresponding surface 41. Shape.
In FIG. 28A, the shaving portion 33 is a large bow, and the first convex portion 21 has a first corresponding surface 41 and an inclined piece portion 30 having an inclined linear bottom surface portion 25 parallel thereto. ,It is configured. In addition, you may form so that the thickness of the inclination piece part 30 may reduce gradually to any one by the back surface part 25A shown with the dashed-dotted line. That is, the alternate long and short dash line indicates that the back surface portion 25 </ b> A is free even if it is not parallel to the first corresponding surface 41.

In FIG. 28 (B), the cross-sectional shape of the shaving part 33 is a roof type, and the 1st convex part 21 is a snail shape which has the nail parts 43 and 43 at both ends. In other words, the shape of the first convex portion 21 is composed of the inclined piece portion 30 and the nail portions 43 and 43 connected to both ends thereof.
Next, in FIG. 28C, the cross-sectional shape of the scraping portion 33 is a rugby sphere, and the first convex portion 21 has a linearly inclined first corresponding surface 41 on the outer side and an inner side (back side). And has an arcuate curved recess.
In FIGS. 28B and 28C, it can be said that the first convex portion 21 is formed with thick reinforcing portions at both ends thereof. Next, in FIG.28 (D), the 1st convex part 21 is a mowing sickle shape in cross-sectional shape. That is, with the linear back surface portion 25B parallel to the first corresponding surface 41 and the linear portion 25C bent substantially at right angles to the linear back surface portion 25B, the mowing sickle shape composed of the handle portion 44 and the blade portion 45 is formed. The 1st convex part 21 is formed. The scraping portion 33 is notched with a broken line composed of a linear back surface portion 25B and a linear portion 25C.

Next, in FIG. 29, a plurality of other modified examples are shown. Although the 2nd convex part 22 is the cross-sectional shape similar to FIG. 25 or FIG. 27, the 1st convex part 21 is different from the modification mentioned above. That is, as shown in FIGS. 29A to 29D, the first convex portion 21 has a cross-sectional shape in which a scraping portion 33 is formed on the opposite surface side (arc surface side) of the first corresponding surface 41. .
As shown in FIG. 29 (A), an arcuate scraping portion 33 is cut out with an inclined linear portion 46. In FIG. 29 (B), the cut-out portion 33 is cut out with a zigzag (stepped) folding line 47. Further, in FIG. 29C, the cut-out portion 33 is notched with the arc line 48. In FIG. 29 (D), the cut-off portion 33 is cut out with a waveform line having two arc lines 49 and 49.
Therefore, the cross-sectional shape of the first convex portion 21 is a shape in which the two fan-shaped portions 50 and 50 are connected in FIG. 29A, the zigzag shape in FIG. 29B, and FIG. ) (D) is a shape in which two ginkgo leaves are connected.

28 and 29, the circular arc 51 of the first convex portion 21 and the circular arc portion 52 of the second convex portion 22 are circularly contoured (similar to the case of FIGS. 24 to 27). When the line G ′ overlaps (matches), a minute seal gap g is formed between the first corresponding surface 41 of the first convex portion 21 and the second corresponding surface 42 of the second convex portion 22. . The maximum dimension of the seal gap g is desirably set to 10 μm or more and 100 μm or less.
In this way, the seal ring S is in a closed state, and the first convex portion 21 and the second convex portion 22 are cross-sectionally shown in FIG. And the seal gap g is the maximum dimension, and the maximum dimension is set to 10 μm or more and 100 μm or less, so that fluid leakage from the first and second corresponding surfaces 41 and 42 can be suppressed, and Since the first convex portion 21 and the second convex portion 22 do not protrude from the contour line G ′, the sealing performance is further improved.

As shown in FIG. 30 and FIG. 31, in the pressure receiving state, the seal ring S is pressed against the corner portion 8 formed by the sealed surface P ₁ and the sealed surface P ₂ , and the first protrusion is caused by the pressure P ₀ of the fluid L. The part 21 is pressed against the second convex part 22.
When the movable scroll 7 scrolls (see FIG. 1), the first corresponding surface 41 and the second corresponding surface 42 approach the mating member --- the sealed surface P ₁ and the sealed surface P _2- The first convex portion 21 is pressed against the second convex portion 22 by the pressure P _{0 of the} fluid L. When the first convex portion 21 presses the second convex portion 22, the sealing performance between both the first convex portion 21 and the second convex portion 22 is improved, and the leakage of the fluid L from the seal gap g is prevented. Decrease. The arc portion 52 of the second convex portion 22, the arc portion 51 of the first convex portion 21 and the like can be left as they are on the injection-molded surface where machining is omitted, and in addition, according to JIS B 0601. The arithmetic average roughness (Ra) of the surface measured according to the above is set to 0.1 or more and 2.0 or less to exhibit excellent sealing performance and wear resistance.

In the present invention, the thermoplastic resin composition to be injection-molded is the same as that having a rectangular cross section (FIGS. 2 to 22), and therefore, a duplicate description is omitted.

The usage method and operation of the seal ring S described above will be described. As shown in FIGS. 30 and 31, the seal ring S is pressed against the movable scroll 7 and the corner portion 8 of the housing 4 in the pressure-receiving state, and the second convex portion 22 is disposed corresponding to the rear position of the corner portion 8. Is done. As described with reference to FIGS. 24, 25, etc., the arc portion 52 of the second convex portion 22 has a central angle β of 90 ° or more, and therefore the arc portion 52 is the movable side sealed surface P of the movable scroll 7. ₁ and the fixed side sealed surface P ₂ are simultaneously slidable (pressure contact). This ensures a positive seal. In addition, since the arc portion 52 is pressed against the surfaces to be sealed P ₁ and P ₂ and the contact surface pressure is high and the contact surface pressure distribution having a peak is drawn, the sealing performance is also excellent.
Moreover, even if it exists in the 1st convex part 21, as FIG. 30 (A) (B) and FIG.31 (B) illustrate, the 1st corresponding surface side edge part 51A of the circular arc part 51 is a movable side sealed surface. Since P ₁ and the fixed-side sealed surface P ₂ may be pressed simultaneously, the sealing performance can be further improved. The first convex portion 21 receives the pressure P _{0 of the} fluid L and elastically deforms toward the second convex portion 22 side and toward the back of the corner portion 8, so that both the sealed surfaces P ₁ and P ₂ Thus, the possibility of pressure contact is increased, and the dimension of the gap g between the first and second corresponding surfaces 41 and 42 is also reduced, thereby reducing fluid leakage.

It should be noted that fluid leakage is not allowed at all at the place where the seal ring S is used in the compressor, and the seal ring S of the present invention has the same level of sealing performance as the current PTFE seal ring. Required. That is, it is not preferable that the seal ring S has excessive fluid leakage (compared to the PTFE seal ring), but it is also not preferable that fluid leakage be excessive. Therefore, the seal ring S of the present invention can be variously changed in shape and size of the first convex portion 21 as described in various manners in FIGS. The amount of deformation (easiness of deformation) of the first convex portion 21 during pressure reception can be adjusted.

The seal ring according to the present invention described in detail with reference to FIGS. 23 to 31 is formed into an annular overall shape having a cut 5 at one circumference, and includes a ring body 1 and a first end of the ring body 1. A seal ring having a first convex portion 21 and a second convex portion 22 projecting in a circumferential direction from the portion 11 and the second end portion 12, the whole being integrally formed of a thermoplastic resin composition, The ring body 1 has a circular cross-sectional shape, and the first convex portion 21 and the second convex portion 22 have a first correspondence by dividing the circular cross-section of the ring body 1 into two by a separation line Lc. The first convex portion 21 and the second convex portion are in a closed state in which the first convex portion 21 and the second convex portion 22 overlap each other with the surface 41 and the second corresponding surface 42 facing each other. 22 is set to a dimension that does not protrude from the contour line G ′ of the cross section of the ring body 1. Because it is formed, the first convex portion 21 sealing performance can be improved in the joint portion of the second convex portion 22 can be reduced fluid leakage. By injection molding of the thermoplastic resin composition, a high-quality and high-performance seal ring can be obtained easily and inexpensively. Machining such as cutting / grinding / cutting can be omitted, material loss is reduced, and manufacturing can be performed at low cost. In particular, since the cross-sectional shape is circular, it is easy to become familiar with the surfaces to be sealed P ₁ and P ₂ , shows a peak shape with a peak contact surface pressure distribution, and has a higher sealing performance. It becomes a ring.

Further, the ring body 1 is formed in an annular overall shape having a cut 5 at one circumference, and the ring body 1 and the first end portion 11 and the second end portion 12 of the ring body 1 are protruded in the circumferential direction. A seal ring having one convex portion 21 and a second convex portion 22, the whole being integrally formed of a thermoplastic resin composition, and the cross-sectional shape of the ring body 1 is circular, and the first The projecting portion 21 and the second projecting portion 22 divide the circular cross section of the ring body 1 into two by the separation line Lc, and face each other with the first corresponding surface 41 and the second corresponding surface 42, and The first convex portion 21 has a cross-sectional shape in which a scraped portion 33 is formed on the opposite surface side of the first corresponding surface 41, and the first convex portion 21 and the second convex portion 22 overlap each other. In the closed state, the first convex portion 21 and the second convex portion 22 are in a cross section of the ring body 1. Since the configuration that is set to a dimension that does not protrude from Guo line G', at first convex portion 21 is pressure-receiving state, pressing the corner portion 8 formed by the sealing surface P _1, P ₂ perpendicular It is easy to deform and the sealing performance is further improved. Furthermore, a high-quality and high-performance seal ring can be obtained easily and inexpensively by injection molding of the thermoplastic resin composition. Machining such as cutting / grinding / cutting can be omitted, material loss is reduced, and manufacturing can be performed at low cost. In particular, since the cross-sectional shape is circular, it is easy to become familiar with the surfaces to be sealed P ₁ and P ₂ , shows a peak shape with a peak contact surface pressure distribution, and has a higher sealing performance. It becomes a ring.

Even if the ring body 1 has a circular cross section, the ring body 1 in the open state has a radius of curvature R ₁₃ within a range of 180 ° ± 30 ° with respect to the center point P _{5 of the} cut 5. there exist site 13 of greatest dimension, the radius of curvature R ₁ toward the said maximum toward each circumferential direction M ₁ from dimension portion 13 of the first end 11, second end 12, M _2, R ₂ is set so as to decrease, and the first convex portion 21 and the second convex portion 22 are configured so that the overall shape is a perfect circle in a closed state where the first convex portion 21 and the second convex portion 22 overlap each other. While the cut 5 that is easy to manufacture is in an open state, the first convex portion 21 and the second convex portion 22 become a true circle under an overlapping usage state, and become a circular inner peripheral surface (sealed surface P _{2 to} be sealed). ) Excellent sealing performance (sealability).

Next, FIGS. 32 to 42 are diagrams showing the tenth and eleventh embodiments of the present invention and the respective modifications.
As shown in FIGS. 32 to 35 and FIGS. 37, 38, 39, etc., the ring main body 1 has a rectangular cross section, and has the notch portion (the shaving portion shown in FIG. 19) described above. ) The ring body 1 has a cross section without 20 and is disposed at a corner 8 formed by a movable side sealed surface P ₁ and a fixed side sealed surface P ₂ orthogonal to each other in the cross section. The two sealing surfaces P ₁ and P ₂ are pressed against each other to form a sealing action in the same manner as in the above-described embodiment, except that the two sealing surfaces P ₁ and P ₂ are orthogonal to _{each other} . sealing opposing area X (FIG. 38, see FIG. 39) opposite to the P ₂ in the non-opposed region Z excluding the erroneous mounting prevention mark U is provided.
The sealing opposing region X corresponds to the first sliding contact surface 26 and the second sliding contact surface 27 in FIG.

If the ring main body 1 has a rectangular cross section, the two sides other than the first slidable contact surface 26 and the second slidable contact surface 27 are non-opposing regions Z. Arrange. In FIGS. 33, 34 and 35, a circular bottomed hole 57 having a predetermined pitch in the circumferential direction is used as a mark U on the opposite surface 56 parallel to the first sliding contact surface 26.
In the embodiment shown in FIG. 33 and FIG. 34, when the entire seal ring S is injection-molded with the thermoplastic resin composition, a bottomed hole 57 as a mismounting prevention mark U is formed integrally at the same time. Yes.

In the embodiment shown in FIGS. 37 (B) and (C), the small concave recess 59 that cuts off the corner 18 between the inner peripheral surface 58 parallel to the second sliding contact surface 27 and the lower surface 56 is used as the seal ring S. Are arranged at a predetermined pitch (similar to FIG. 35). The small concave depression 59 has a cubic shape in FIG. 37 (B), and has a four semi-cylindrical shape or a four hemispherical shape in FIG. 37 (C). In the embodiment shown in FIG. 39, the mark U is configured by providing a small concave recess 59 similar to that shown in FIG.

Next, the cross-sectional shape of the first convex portion 21 and the second convex portion 22 corresponds to the inclination by dividing the basic rectangle (cross-sectional rectangular shape) as shown in FIG. 36 into two by the separation line Lc. The surface 23 and the inclined surface 24 correspond to each other. The second convex portion 22 has a corner portion 15A that is continuous with the corner portion 15 of the ring body 1 described above, and both of FIGS. 36 (A), (B), and (C) are directed toward the second convex portion 22. However, the cross-sectional area is smaller than that of the first protrusion 21, and the triangle having the apex at the one corner 15A of the second protrusion 22 corresponds to the back corner of the corner 8, as shown in FIG. Thus, the gap 9 is closed and the sealing performance is exhibited. 36A, 36B, and 36C illustrate the case where the cross section of the second convex portion 22 is a triangle, a small rectangle, and a semicircular shape, respectively. Further, as shown in FIG. 35, in the closed state where the first convex portion 21 and the second convex portion 22 overlap each other, as shown in FIG. 36, the first convex portion 21 and the second convex portion. 22 sets the dimensions of the cross sections of the first convex portion 21 and the second convex portion 22 to dimensions (dimensional tolerances) that do not protrude from the basic rectangle G (see FIG. 37).

Next, in FIG. 40, the cross-sectional shape of the second convex portion 22 is a triangle, whereas the first convex portion 21 is formed with a scraped portion (concave portion) 33 on the opposite side of the slope corresponding surface 23. Yes. 40 (A) and 40 (B) (solid line), the cross-sectional shape of the first convex portion 21 is a trapezoid having a bottom surface portion 25 that is an inclined line parallel to the inclination-corresponding surface 23. The size T ₁ can be changed in size. Furthermore, as indicated by the alternate long and short dash line in FIG. 40 (B), the inclined line 25 </ b> D that forms the bottom surface of the first convex portion 21 may be non-parallel to the inclined corresponding surface 23.

Next, in FIG. 40C, the first convex portion 21 has a cross-sectional shape composed of an inclined piece portion 30 and first and second contact piece portions (bent piece portions) 31 and 32 at both ends thereof. The scraping portion 33 has a diamond-shaped cross section.
In FIG. 40D, the recess 33 is formed in a curved arc shape. The first convex portion 21 has a contact piece portion 31A, 32A which abuts on the sealing surface P _1, P ₂ (see FIG. 32).
Further, in FIGS. 40A to 40D, the erroneous mounting prevention mark U formed on the ring body 1 side is shown by a broken line. That is, the erroneous mounting prevention mark U is recessed in the non-facing region Z. Specifically, the mark U in FIGS. 40A, 40C, and 40D is disposed at the same position as in FIGS. 37B and 37C, and the mark U in FIG. It is the same as 37 (A).

Next, in the eleventh embodiment shown in FIG. 41, the cross-sectional shape of the ring body 1 of the seal ring S is circular, and in the mounted state in which the seal groove 4B of the housing 4 of the scroll compression mechanism 3 is mounted. The arc-shaped first and second sliding contact portions 26A and 27A are in sliding contact with the sealed surfaces P ₁ and P ₂ , respectively. The first and second sliding contact portions 26 </ b> A and 27 </ b> A are located at a center angle of about 90 ° in the cross section of the circular ring body 1. Even in the ring main body 1 having such a circular cross section, the non-facing region Z is provided with a mark U (bottom hole 57) for preventing erroneous mounting. Thus, it can be said that the ring main body 1 is a basic circle (circular outline) G ′.

42, the basic circular shape (circular contour line) G ′ is divided into two by the separation line Lc, and the first convex portion 21 and the second convex portion 22 are formed. The first convex portion 21 and the second convex portion 22 face the inclined corresponding surface 23 and the inclined surface 24 with a minute seal gap g. The first convex portion 21 is formed with a scraping portion 33 on the opposite surface side of the inclination corresponding surface 23. In the closed state where the first convex portion 21 and the second convex portion 22 overlap each other, the first convex portion 21 and the second convex portion 22 are from the outline (basic circle G ′) of the cross section of the ring body 1. The dimensions are set so as not to protrude.

And the cross-sectional shape of the 2nd convex part 22 is a thin arch shape, and it is formed with the circular arc part 52 and the inclined surface 24 (as a string), and the circular arc part 52 of this 2nd convex part 22 is (FIG. 41). (Shown in Fig. ₁ )) In use, press contact (sliding contact) with the sealed surfaces P ₁ and P ₂ .
Although not shown, the first convex portion 21 may have a cross-sectional shape in which the scraping portion 33 is omitted.

In FIG. 42A, the shaving portion 33 has a large bow shape, and the first convex portion 21 has an inclined piece portion 30 having an inclined corresponding surface 23 and an inclined bottom surface portion 25 parallel thereto. It is configured. In addition, you may form so that this thickness may reduce to either one gradually.
In FIG. 42 (B), the cross-sectional shape of the shaving part 33 is a roof type, and the 1st convex part 21 is a snail shape which has the nail parts 43 and 43 at both ends.
Next, in FIG. 42C, the cross-sectional shape of the scraping portion 33 is a rugby sphere, and the first convex portion 21 has a linearly inclined inclined corresponding surface 23 on the outer side, and on the inner side (back side). It has an arcuate curved recess.

Incidentally, in FIG. 42A, small convex portions 54 and 54 are provided in the non-facing region Z of the ring main body 1 as the mark U for erroneous mounting prevention. Such small convex portions 54 may be provided in place of the holes 57 and the small concave recess portions 59 in FIGS. 32 to 35 and FIGS. 37 to 40 described above.

In the use state shown in FIG. 38 and FIG. 39, the second convex portion 22 that should be arranged at the innermost portion of the corner portion 8 is present at the lower side, assuming that the mounting is upside down in the figure. However, it is clear that the first convex portion 21 is disposed at the innermost portion and it is difficult to seal the first convex portion 21 so as not to leak the fluid.
In particular, as can be seen in FIGS. 33 and 34, the first convex portion 21 and the second convex portion 22 are extremely small compared to the size of the ring body 1, and which corresponds to the corner portion 8 (the innermost portion). It is very difficult to determine at the time of work whether or not it should be done. In the present invention, as illustrated in FIG. 35, if turned over, the mounting direction of the seal ring S can be easily and clearly determined by visual observation during the mounting operation. That is, erroneous mounting of the seal ring S can be prevented easily and reliably. Further, as is clear from FIG. 35 and the like, the mark U can be attached without making the shape and structure of the seal ring S almost complicated.

Incidentally, it may form a groove on the first sliding surface 26 corresponding to the movable side the sealing surface P ₁ (26A) for friction reduction is desired. In the seal ring S in which such a concave groove is formed, a large number of small bottomed holes 57 are arranged at a predetermined pitch in the circumferential direction as shown in FIGS. There is also an advantage that it can be clearly identified without mixing with the above-mentioned concave groove. Note that the erroneous mounting prevention mark U is not limited to the above-described embodiment, and it may be preferable that the character, figure, or symbol is attached to the opposed region Z in a concave shape or a convex shape. The above-described embodiment and characters / graphics / symbols can be used in combination.

As described above with reference to FIGS. 32 to 42, the seal ring of the present invention has an annular shape having a cut 5 at one circumference, and includes the ring body 1 and the first end of the ring body 1. A first convex portion 21 and a second convex portion 22 projecting from the portion 11 and the second end portion 12 in the circumferential direction, and further formed by two orthogonal sealed surfaces P ₁ and P ₂ . In a seal ring disposed in the corner 8 and pressed against the sealed surfaces P ₁ , P ₂ to form a sealing action, the two sealing surfaces P ₁ , P ₂ orthogonal to each other are sealed. Since the non-facing area Z excluding the facing area X is provided with a mark U for erroneous mounting prevention, it is a mistake to install it upside down (front and back) in the assembling (mounting) work into the scroll compressor. Can be reliably prevented. As a result, the results of research and development regarding the delicate and novel shapes of the very small first convex portion 21 and the second convex portion 22 can be exhibited without fail in the field.
Moreover, since the whole of the thermoplastic resin composition is injection-molded, and the erroneous mounting prevention mark U is integrally formed by the injection molding, the erroneous mounting prevention mark U is provided efficiently and easily. Can do. In addition, a high-quality and high-performance seal ring can be obtained easily and inexpensively by injection molding of the thermoplastic resin composition.

Next, FIGS. 43 to 49 are views showing the twelfth to fifteenth embodiments of the present invention and modifications thereof. Since the overall configuration and the like are substantially the same as the configurations shown in FIGS. 1 to 31 described above, repeated explanation is omitted, but in the embodiment and the modification of FIGS. 43 to 49, The point provided with the 3rd convex part 63 is the biggest characteristic.

This will be described in detail below. 43, 44, and 45, the ring body 1 has a rectangular cross-sectional shape, and the first convex portion 21 and the second convex portion 22 are 44, the rectangular cross section of the ring body 1 is divided into two at the separation line Lc as shown in FIG. 44, and the first corresponding surface 41 and the second corresponding surface 42 correspond to each other. The part 21 is formed with a scraping part (concave part) 33 on the opposite side of the first corresponding surface 41. 44 correspond to the same reference numerals as those in FIG. 10 and the like, and the description thereof is omitted here.
The third convex portion 63 projects from the first end portion 11 of the ring body 1 in the circumferential direction. As shown in FIGS. 43, 44 and 45, the third convex portion 63 This is for protecting the one convex portion 21 from the scraping portion 33 side (with respect to collision or interference of other objects).
That is, the first convex portion 21 is an extremely small portion compared to the ring body 1 as a whole. When the first convex portion 21 suddenly collides with another object or is dropped on a floor or a desk, the first convex portion 21 is There is a possibility of being easily damaged such as a crack or breakage. In particular, since it is a thermoplastic resin composition, it is easy to cause the above-mentioned damage, and such a damage is protected from the side of the scraped portion 33 of the first convex portion 21 to prevent the first convex portion from being damaged (function). ).

43, FIG. 44 (A), and FIG. 46, the 3rd convex part 63 shows the case of a square, and FIG. 44 (B) has shown the square which has the chamfer 64. In FIG. In addition, the third convex portion 63 is disposed closer to the corner portion 18 so as to coincide with the corner portion 18 and two right-angle sides forming the corner portion 18 shown in FIG.

In the closed state where the first convex portion 21 and the second convex portion 22 overlap each other (see FIGS. 5 and 6 described above), the first convex portion 21, the second convex portion 22, and the second convex portion 22. The first convex portion 21, the second convex portion 22, and the second convex portion 63 have dimensions (dimensional tolerances) that do not protrude from the contour line (basic rectangle G shown in FIG. 7) of the cross section of the ring body 1. The dimension of each cross section of the three convex parts 63 is set.

That is, as shown in FIG. 44, when the first convex portion 21, the second convex portion 22, and the third convex portion 63 overlap (coincide with) the four sides of the basic rectangle G in FIG. A minute seal gap g is formed between the inclined corresponding surface 23 (of the first convex portion 21) and the inclined surface 24 (of the second convex portion 22). The maximum dimension of the seal gap g is desirably set to 10 μm or more and 100 μm or less.
In this manner, the corresponding two surfaces 23, 24 (in the closed state and the first convex portion 21, the second convex portion 22, and the third convex portion 63 are overlapped with the four sides of the basic rectangle G. Since the maximum gap dimension is set to 10 μm or more and 100 μm or less with the seal gap g of the first and second corresponding surfaces 41 and 42 being maximized, the corresponding two surfaces 23 and 24 (first and second correspondences) The leakage from the surfaces 41, 42) can be suppressed, and the first convex portion 21, the second convex portion 22, and the third convex portion 63 do not protrude from the basic rectangle G, and the sealing performance can be further improved. 43B, the first convex portion 21 and the third convex portion 63 project in parallel from the end face 11Z of the first end portion 11 of the ring body 1.

Next, in the embodiment shown in FIGS. 45A and 45B, the thin-walled third convex portion 63 is disposed along the side 65 connecting the corner portion 18 and the corner portion 19. Also in the case of FIG. 45, the cut gap is closed, and the seal gap g between the corresponding two surfaces 23 and 24 is set so that the first convex portion 21 and the second convex portion 22 overlap the four sides of the basic rectangle G. In the maximum state, the maximum gap dimension is set to 10 μm or more and 100 μm or less, and the first convex portion 21 and the second convex portion 22 do not protrude from the contour line (basic rectangle G) of the ring body 1. 45A and 45B, the first convex portion 21, the second convex portion 22, and the third convex portion 63 do not protrude from the contour line (basic rectangle G) of the ring body 1. It is desirable to configure as follows.

Incidentally, in the embodiment shown in FIG. 45 (A), the spacing portion 66 is formed between the upper end of the third convex portion 63 and the first contact piece portion 31 of the first convex portion 21. In the embodiment shown in FIG. 45 (B), the upper end of the thin piece-like third convex portion 63 is continuous with the first convex portion 21. Then, the entire side 65 is formed with the third protrusion 63 and a part of the first protrusion 21. If it does in this way, there exists an advantage that the 3rd convex part 63 does the effect | action of reinforcement, and a metal mold | die structure becomes simple.

As shown in FIG. 46, in the pressure receiving state, the seal ring S is pressed against the corner portion 8 formed by the movable side sealed surface P ₁ and the fixed side sealed surface P ₁ , and the first pressure P ₀ of the fluid L causes the first. The convex portion 21 is elastically deformed and pressed against the second convex portion 22.
As the movable scroll 7 performs a scrolling motion, the first sliding contact surface 26 and the second sliding contact surface 27 come into contact (pressure contact) with the mating member --- the sealed surface P ₁ and the sealed surface P ₂ --- The first convex portion 21 is pressed against the second convex portion 22 by the pressure P _{0 of the} fluid L. When the first convex portion 21 presses the second convex portion 22, the sealing performance between both the first convex portion 21 and the second convex portion 22 is improved, and the leakage of the fluid L from the seal gap g is prevented. Decrease. As is clear from FIGS. 44 and 45, the first and second convex portions 21 and 22 are formed with a first sliding contact surface 26 and a second sliding contact surface 27 having a continuous surface. In addition, the manufacturing method, surface roughness, material, and the like are the same as those of the embodiments described with reference to FIGS.

46, the relationship between the 3rd convex part 63 and the 1st, 2nd convex parts 21 and 22 is demonstrated. As illustrated in FIG. 46 and FIGS. 43, 44, and 45 (A), the third convex portion 63 is separated from the first convex portion 21 and protrudes from the first end portion 11. As shown in FIG. 46, when the pressure P ₀ is received, the first convex portion 21 exhibits a sealing (sealing) function while being elastically deformed, but the third convex portion 63 is sealed (sealed). It is irrelevant to the function, so to speak, exists as a “dummy”, and is a damage preventing convex portion that protects the first convex portion 21. The first convex portion 21 is protected from the scraping portion 33 side from interfering with other objects to be damaged such as cracks or breakage. In some cases, the third convex portion 63 itself is damaged to absorb the impact. The first convex portion 21 is protected.
In FIG. 45B, the third convex portion 63 also exhibits the function of reinforcing a part of the first convex portion 21.

47A and 47B are cross-sectional views showing the fourteenth and fifteenth embodiments of the present invention.
In the ring body 1, the basic rectangle G is a rectangle, and the side (short side) forming the first sliding contact surface 26 is shorter than the side (long side) forming the second sliding contact surface 27. That is, (used in sliding contact with the movable side to be sealed surface P ₁ At a state) frictional resistance of the first sliding contact surface 26 is reduced, which improves the sliding property.
As shown in FIGS. 47A and 47B, the second convex portion 22 has a triangular cross-sectional shape, and the first convex portion 21 is inclined on one side of the quadrangle of the second convex portion 22. An inclined piece 30 having an inclined corresponding surface 23 parallel to the surface 24 is provided. The inclined piece part 30 has an inclination corresponding surface 23 on the outer side, and a scraping part 33 is formed on the inner side.

FIG. 47A shows an example in which the substantially square shape of the embodiment of FIG. 45A is a rectangle, and the third convex portion 63 is formed in a thin piece along the long side 65 connecting the corner portions 18 and 19. The configuration such as that described above is similar to that described with reference to FIG. FIG. 47B shows a case where the square cut-out portion 33 in FIG. 47A is changed to a cut portion 33 having an arcuate curve. 47A is the same as that in FIGS. 47A and 47B, and the solid line separates from the first protrusion 21 and performs the operation described in FIG. In each of FIGS. 47A and 47B, as shown by a two-dot chain line 67, the third protrusion 63 is extended along one side 65 (extending upward) of the first protrusion 21. Even if it connects with the 1st contact piece part 31, it is preferable. The operation (effect) is the same as that described with reference to FIG.

Next, FIG. 48 and FIG. 49 show various modifications. Except for the fact that the cross-sectional shape of the ring body 1 is circular, the configuration is the same as in FIGS. 43 to 46, and the same reference numerals indicate the same configuration.
As shown in FIG. 48 and FIG. 49, the first convex portion 21 and the second convex portion 22 divide the outline of the circular cross section of the ring body 1 into two by the separation line Lc, and the first corresponding surface 41. The second corresponding surfaces 42 face each other. A scraping portion 33 is formed on the opposite side of the first corresponding surface 41 of the first convex portion 21, and a first convex portion breakage preventing third convex portion 63 is disposed on the scraping portion 33 side. Projecting in the circumferential direction.
Moreover, as shown in FIGS. 48A, 48B, and 48C, the first convex portion 21 and the second convex portion are in a closed state where the first convex portion 21 and the second convex portion 22 overlap each other. 22 does not protrude from the circular outline of the ring body 1. 48A, 48B, and 48C, all of the first, second, and third convex portions 21, 22, and 63 do not protrude from the circular outline of the ring body 1. It is desirable to configure as follows.
48A and 49, the scraping portion 33 is a large arcuate shape, and the first convex portion 21 includes a first corresponding surface 41 and an inclined linear bottom surface portion 25 parallel to the first corresponding surface 41. It has the inclined piece part 30 which has. In addition, the two third convex portions 63, 63 project from the end surface 11 </ b> Z of the first end portion 11 of the ring body 1. Specifically, each 3rd convex part 63 is a substantially 4 semicircle, and is arrange | positioned in the separated form in the position which protects the both ends 21A and 21A of the 1st convex part 21. As shown in FIG.

Next, in the embodiment shown in FIG. 48 (B), the cross-sectional shape of the scraping portion 33 is a roof shape, and the first convex portion 21 is a squirrel-shaped shape having nail portions 43 and 43 at both ends. On the side of the scraping portion 33, two Maruyama-shaped third convex portions 63, 63 are disposed to protect the nail portions 43, 43.
Next, in FIG. 48C, the cross-sectional shape of the scraping portion 33 is a rugby sphere, and the first convex portion 21 has a linearly inclined first corresponding surface 41 on the outer side and an inner side (rear side). And has an arcuate curved recess. A substantially circular third convex portion 63 is disposed at the position of the scraping portion 33.
In addition, the shape of the scraping portion 33 can be freely changed in design, and the shape of the third convex portion 63 can also be freely changed, so that the first convex portion 21 can be effectively prevented from being damaged. It is enough if it functions.

As described above in detail, the seal ring according to the present invention is formed in an annular overall shape having a cut 5 at one place on the circumference, and the ring body 1 and the first end portion 11 of the ring body 1. In the seal ring having the first convex portion 21 and the second convex portion 22 projecting in the circumferential direction from the second end portion 12, the entire ring is integrally formed of a thermoplastic resin composition. 1 has a rectangular shape or a circular shape, and the first convex portion 21 and the second convex portion 22 divide the rectangular cross section of the ring body 1 into two by a separation line Lc. The first corresponding surface 41 and the second corresponding surface 42 face each other, and the first convex portion 21 has a cross-sectional shape in which a scraping portion 33 is formed on the opposite surface side of the first corresponding surface 41. In addition, the third convex portion 63 for preventing damage to the first convex portion is formed on the side of the scraping portion 33, and the first end 11, the first convex portion 21 and the second convex portion 22 are in the closed state in which the first convex portion 21 and the second convex portion 22 overlap each other, and the first convex portion 21 and the second convex portion 22 are in the ring body 1. Therefore, the sealing performance at the joint portion of the first convex portion 21 and the second convex portion 22 is improved, and fluid leakage from the joint portion can be reduced. In particular, the third convex portion 63 can reliably prevent the first convex portion 21 that is extremely small compared to the ring body 1 from being damaged by interference with other objects, and the sealing performance at the joint portion is maintained. Is done. With injection molding of thermoplastic resin composition, dimensions can be set easily, high-quality and high-performance seal rings can be obtained easily and inexpensively, and machining such as cutting, grinding, and cutting can be omitted. Therefore, there is little material loss.
The third convex part 63 can also be easily formed by injection molding of the above material simultaneously with the first and second convex parts 21 and 22.

DESCRIPTION OF SYMBOLS 1 Ring main body 5 Cut | interruption 11 1st edge part 12 2nd edge part 13 The site | part of the largest dimension 15 Corner | angular part 18 Corner | angular part 20 Notch part (cutting part)
21 1st convex part 22 2nd convex part 26 1st slidable contact surface 27 2nd slidable contact surface 29 Notch part 33 Cutting part (concave part)
41 first correspondence face 42 second corresponding surface 63 third convex portion G basic rectangular G'circular outline Lc separation line M _1, M ₂ circumferential P ₁ movable the sealed surface P ₂ stationary be sealed surface P ₅ Central Point R ₁₃ , R ₁ , R ₂ Radius of curvature S Seal ring U Mark for preventing incorrect mounting X Sealing facing area Z Non-facing area

Claims (10)

Formed in an annular overall shape having a cut (5) at one place on the circumference, from the ring body (1) and the first end (11) and the second end (12) of the ring body (1) In a seal ring having a first protrusion (21) and a second protrusion (22) projecting in the circumferential direction,
The whole is integrally formed with the thermoplastic resin composition,
The ring body (1) has a rectangular cross-sectional shape, and the first protrusion (21) and the second protrusion (22) separate the rectangular cross-section of the ring body (1) from the separation line. (Lc) is divided into two and the first corresponding surface (41) and the second corresponding surface (42) face each other, and the first convex portion (21) is formed on the first corresponding surface (41). It is a cross-sectional shape in which a scraped portion (33) is formed on the opposite surface side,
The first convex portion (21) and the second convex portion (22) are in a closed state where the first convex portion (21) and the second convex portion (22) overlap each other, and the first convex portion (21) and the second convex portion (22) are A seal ring having a dimension that does not protrude from the outline of the cross section of 1). Formed in an annular overall shape having a cut (5) at one place on the circumference, from the ring body (1) and the first end (11) and the second end (12) of the ring body (1) In a seal ring having a first protrusion (21) and a second protrusion (22) projecting in the circumferential direction,
The whole is integrally formed with the thermoplastic resin composition,
The cross-sectional shape of the ring body (1) is _one corner of the basic rectangle (G) corresponding to the corner (8) of the movable side sealed surface (P ₁ ) and the fixed side sealed surface (P ₂ ). With respect to the part (15), the other corner (18) of the basic rectangle (G) as a diagonal is notched to form a notch (20),
The first convex part (21) and the second convex part (22) divide the transverse section of the ring body (1) having the notched part (20) into two parts by a separation line (Lc). The first corresponding surface (41) and the second corresponding surface (42) face each other, and the first convex portion (21) is continuous with the notched portion (20) of the ring body (1). A cross-sectional shape in which a shaving portion (33) is formed,
The first convex portion (21) and the second convex portion (22) are in a closed state in which the first convex portion (21) and the second convex portion (22) overlap each other, and the first convex portion (21) and the second convex portion (22) are A seal ring having a dimension that does not protrude from G). The first sliding contact surface (26) in which the ring body (1) is in sliding contact with the movable-side sealed surface (P ₁ ) is provided with a shallow groove-shaped notch (29) for reducing frictional resistance. 2. The seal ring according to 2. The first slidable contact surface (26) in which the ring body (1) is slidably contacted with the movable side sealed surface (P ₁ ) is covered with a material having a low friction coefficient so as to reduce the frictional resistance. The seal ring according to claim 1 or 2. Formed in an annular overall shape having a cut (5) at one place on the circumference, from the ring body (1) and the first end (11) and the second end (12) of the ring body (1) A seal ring having a first convex portion (21) and a second convex portion (22) projecting in the circumferential direction,
The whole is integrally formed with the thermoplastic resin composition,
The cross-sectional shape of the ring body (1) is a circle, and the first protrusion (21) and the second protrusion (22) are separated from the circular cross-section of the ring body (1) by a separation line (Lc). ) To divide into two and make the first corresponding surface (41) and the second corresponding surface (42) face each other,
The first convex portion (21) and the second convex portion (22) are in a closed state where the first convex portion (21) and the second convex portion (22) overlap each other, and the first convex portion (21) and the second convex portion (22) are 1) A seal ring having a dimension that does not protrude from the contour line (G ′) of the cross section. Formed in an annular overall shape having a cut (5) at one place on the circumference, from the ring body (1) and the first end (11) and the second end (12) of the ring body (1) A seal ring having a first convex portion (21) and a second convex portion (22) projecting in the circumferential direction,
The whole is integrally formed with the thermoplastic resin composition,
The cross-sectional shape of the ring body (1) is a circle, and the first protrusion (21) and the second protrusion (22) are separated from the circular cross-section of the ring body (1) by a separation line (Lc). ) So that the first corresponding surface (41) and the second corresponding surface (42) face each other, and the first convex portion (21) is the opposite surface of the first corresponding surface (41). It has a cross-sectional shape with a cut-off portion (33) formed on the side,
The first convex portion (21) and the second convex portion (22) are in a closed state where the first convex portion (21) and the second convex portion (22) overlap each other, and the first convex portion (21) and the second convex portion (22) are 1) A seal ring having a dimension that does not protrude from the contour line (G ′) of the cross section. The ring main body (1) in the opened state has a radius of curvature (R ₁₃ ) within a range of 180 ° ± 30 ° with respect to the center point (P ₅ ) of the cut (5) (13) And a radius of curvature (as it approaches the circumferential direction (M ₁ ) (M ₂ ) from the maximum dimension portion (13) toward each of the first end (11) and the second end (12). R ₁ ) (R ₂ ) is set so as to decrease, and the overall shape becomes a perfect circle in the closed state where the first convex portion (21) and the second convex portion (22) overlap each other. The seal ring according to claim 1, 2, 5, or 6 configured as described above. An annular shape having a notch (5) at one circumference, the ring body (1), and the ring body (1) from the first end (11) and the second end (12) in the circumferential direction A corner (8) having first and second protrusions (21) and (22) projecting, and further formed by two orthogonally sealed surfaces (P ₁ ) and (P ₂ ). ) And a sealing ring that is in pressure contact with the sealed surface (P ₁ ) (P ₂ ) and has a sealing action,
A mark (U) for preventing erroneous mounting is provided in the non-facing area (Z) excluding the sealing facing area (X) facing the two sealed surfaces (P ₁ ) and (P ₂ ) orthogonal to each other. Characteristic seal ring. The seal ring according to claim 8, wherein the whole is injection-molded with the thermoplastic resin composition, and the erroneous mounting preventing mark (U) is integrally formed by the injection molding. The first convex portion breakage preventing third convex portion (63) is provided on the side of the scraping portion (33) so as to protrude from the first end portion (11) in the circumferential direction. Seal ring.

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