JP7000180B2 - Tip seal for scroll compressor - Google Patents

Description

The present invention relates to a chip seal used in a scroll type compressor (compressor).

In the scroll type compressor, a substrate and a fixed scroll having a spiral wall erected on the surface of the substrate and a movable scroll are meshed with each other at the spiral wall, and a compression chamber is formed between them. This compression chamber moves toward the center of the spiral by the action of the movable scroll that revolves around the axis of the fixed scroll, and compression of gas or the like is performed. In order to ensure the airtightness of the compression chamber when compressing gas or the like, a seal groove is formed on the end face of the spiral wall of the fixed scroll and the movable scroll, which are scroll members, along the extension direction of the spiral, and a seal groove is formed in the groove. Contains a chip seal, which is a sealing member that comes into contact with the facing scroll substrate (end plate).

Such a chip seal is manufactured, for example, by injection molding a predetermined synthetic resin into a spiral shape as if a long member having a rectangular cross section is spirally wound (see Patent Document 1). As shown in FIG. 7, this type of chip seal 21 is accommodated with a gap in the groove 22a of one wrap (swirl wall) 22, and is gas between the groove 22a and the end plate (scroll substrate) 23 facing the groove 22a. It rises from the groove bottom 22b toward the end plate 23 by the pressure of 24. The surfaced chip seal 21 is in sliding contact with the end plate 23 on the sealing surface 21a, which is one surface forming a rectangular cross section, and seals the compression chamber between the spiral walls.

JP-A-2002-322988

In order to save energy in the scroll type compressor, it is important to reduce the torque during scrolling by reducing the friction between the scroll member and the tip seal. However, when the cross section of the chip seal is rectangular, the sliding area with the scroll board is large and the frictional force on the sliding surface is large.

The present invention has been made to deal with such a problem, and it is possible to reduce the frictional force between the scroll member and the chip seal while maintaining the sealing property, and it is possible to contribute to the energy saving of the scroll type compressor. It is intended to provide a chip seal for use.

The chip seal for a scroll type compressor of the present invention is a scroll type compressor provided with a fixed scroll and a movable scroll, which are scroll members, for sealing a compression chamber formed between the fixed scroll and the movable scroll. A spiral-shaped chip seal, the chip seal has a plurality of recesses in which the sliding surface is partially cut out on a sliding surface with the scroll member, and the plurality of recesses are the inner circumference of the spiral. It is arranged on at least one of the surface and the outer peripheral surface, and each recess is characterized by opening to the inner peripheral surface or the outer peripheral surface and not penetrating the inner peripheral surface and the outer peripheral surface.

The ratio of the total area of the recesses on the sliding surface (total recess area / (total recess area + actual sliding area) × 100) is characterized by being 5 to 45%.

The planar shape of the concave portion is characterized by having a substantially rectangular shape along an arc shape or a spiral shape.

The depth of the recess is 45% or less of the thickness of the chip seal.

A plurality of the recesses are provided on the sliding surface at intervals in the length direction from the winding start end to the winding end of the spiral of the tip seal, and the opening length of each of the recesses is the tip. It is 1 to 20% of the unfolded length of the seal, and is characterized in that the space between the adjacent recesses is a part of the sliding surface.

Further, the area of the plane shape of the recess is substantially the same between the recesses. Further, the recesses are characterized in that a plurality of the recesses are installed on the sliding surface at equal intervals.

The planar shape of the concave portion is arcuate, and the radius of the arc of the concave portion installed is continuously or gradually increased from the winding start end to the winding end of the spiral of the tip seal. It is a feature.

The chip seal is characterized by being made of synthetic resin.

The chip seal for a scroll type compressor of the present invention is a spiral-shaped chip seal for sealing a compression chamber formed between a fixed scroll which is a scroll member and a movable scroll, and has a sliding surface with the scroll member. Since the sliding surface has a plurality of recesses partially cut out, the sliding area is reduced and the surface pressure is increased, so that the frictional force on the sliding surface can be reduced. As a result, the torque at the time of scrolling of the scroll member in the scroll type compressor can be reduced, and the energy saving of the compressor can be contributed. Further, a plurality of recesses on the sliding surface are arranged on at least one of the inner peripheral surface and the outer peripheral surface of the spiral, and each recess opens to the inner peripheral surface or the outer peripheral surface and penetrates the inner peripheral surface and the outer peripheral surface. Therefore, lubricating oil such as refrigerating machine oil is supplied to the sliding surface while maintaining the sealing property, and the frictional force on the sliding surface can be further reduced.

Since the ratio of the total area of the recesses on the sliding surface (total recessed area / (total recessed area + actual sliding area) x 100) is 5 to 45%, the frictional force on the sliding surface becomes small and the machine The decrease in strength is suppressed.

Since the planar shape of the concave portion is a substantially rectangular shape along an arc shape or a spiral shape, the design and arrangement of the concave portion can be facilitated. In particular, in the case of arranging a plurality of them, it becomes easy to design so that the areas are substantially the same.

Since the depth of the concave portion is 45% or less of the thickness of the chip seal, sufficient sealing performance can be ensured while providing the concave portion with the sliding surface partially cut out.

A plurality of recesses are installed on the sliding surface apart from each other in the length direction from the winding start end to the winding end end of the spiral of the tip seal, and the opening length of each of the recesses is the unfolding of the tip seal. Since it is 1 to 20% of the length and the space between the adjacent recesses is a part of the sliding surface, the sliding area can be reduced and the frictional force on the sliding surface can be further reduced.

Further, since the area of the plane shape of the concave portion is substantially the same, the difference in frictional force between the sealed portions becomes small, and stable scrolling of the scroll member becomes possible. Further, since a plurality of recesses are installed on the sliding surface at equal intervals, stable scrolling of the scroll member is possible as described above.

The planar shape of the recess is arcuate, and the radius of the arc of the recess installed is continuously or gradually increased from the winding start end to the winding end end of the spiral of the chip seal, so that the opening of the recess is opened. The area of the planar shape of the recesses can be substantially the same between the recesses while the lengths and the like are almost the same.

It is a top view which shows an example of the chip seal of this invention. It is an enlarged view around the recess in FIG. 1. It is sectional drawing in the state which the chip seal was incorporated in the compressor. It is a top view which shows the other example of the chip seal of this invention. It is an enlarged view around the recess in FIG. It is a partial cross-sectional view of the compression mechanism part of a scroll type compressor. It is sectional drawing of the state in which the conventional chip seal is incorporated in a compressor.

An example of the structure of the compression mechanism portion of the scroll type compressor to which the chip seal of the present invention is applied will be described with reference to FIG. FIG. 6 is a partial cross-sectional view of the compression mechanism portion of the scroll type compressor. As shown in FIG. 6, the scroll compressor comprises a fixed scroll 14 having a substrate 14a and an upright swirl wall 14b on its surface, and a movable scroll 15 having a substrate 15a and an upright swirl wall 15b on its surface. There is. The fixed scroll 14 and the movable scroll 15 are meshed with each other in an eccentric state at the spiral wall boundary 16, and a compression chamber 12 is formed between them. As the movable scroll 15 revolves around the axis of the fixed scroll 14, the compression chamber 12 moves toward the center of the spiral shape, and compression of gas or the like is performed. Seal grooves 13 along the extension direction of the spiral are formed on the end faces of the spiral wall of the fixed scroll 14 and the movable scroll 15. The chip seal 11 of the present invention is housed in the seal groove 13 and is in sliding contact with an opposing scroll substrate to ensure the airtightness of the compression chamber 12.

An example of the tip seal for a scroll type compressor of the present invention will be described with reference to FIGS. 1 to 3. FIG. 1 is a plan view of the chip seal of the present invention as viewed from the sliding surface side with a mating scroll member serving as a sealing surface, FIG. 2 is a partially enlarged view thereof, and FIG. 3 uses this chip seal as a compressor. It is a cross-sectional view of the assembled state. As shown in FIG. 1, the chip seal 1 has a spiral shape as if a long member having a substantially rectangular cross section is spirally wound. This spiral shape is a shape in which the radius of curvature gradually increases from the winding start end portion 2 to the winding end end portion 3. The sliding surface 5 is a sliding surface with the scroll substrate facing the sliding surface, and is a sealing surface for sealing gas or the like in the compression chamber.

The chip seal 1 has a plurality of recesses 4 in which the sliding surface 5 is partially cut out on the sliding surface 5 with the scroll member. The plurality of recesses 4 are arranged on the inner peripheral surface 1b of the spiral. The recess 4 may be arranged on the outer peripheral surface 1a, or may be arranged on both the inner peripheral surface 1b and the outer peripheral surface 1a. The individual recesses open to the inner peripheral surface 1b or the outer peripheral surface 1a and do not penetrate the inner peripheral surface 1b and the outer peripheral surface 1a. That is, in the chip seal 1 in which the plurality of recesses 4 are formed, the recess of the inner peripheral surface 1b does not penetrate the outer peripheral surface 1a, and the recess of the outer peripheral surface 1a does not penetrate the inner peripheral surface 1b. Instead of making the recess 4 a closed recess in the sliding surface, the edge of the sliding surface 5 is cut out so as to be opened in the inner peripheral surface 1b or the outer peripheral surface 1a, so that the recess is filled with refrigerating machine oil or the like. Lubricating oil can be introduced, and the supply of lubricating oil to the sliding surface becomes easy. Further, the sealing property can be ensured by opening the concave portion 4 only in one of the inner peripheral surface 1b and the outer peripheral surface 1a of the spiral and making the inner peripheral surface 1b and the outer peripheral surface 1a non-penetrating.

Further, since the ratio of the total area of the recesses on the sliding surface (total recessed area / (total recessed area + actual sliding area) x 100) is 5 to 45%, the frictional force on the sliding surface is effective. Can be made smaller. When the ratio of the total area of the recesses on the sliding surface is less than 5%, the surface pressure of the sliding surface cannot be effectively increased, and the effect of reducing the frictional force is poor. Further, when it is more than 45%, the gas pressure from the recess becomes high, the gas pressure from the anti-sealing surface is canceled out, and the surface pressure of the sliding surface is lowered, so that the effect of reducing the frictional force becomes poor. .. The ratio of the total area of the recesses on the sliding surface is preferably 7 to 40%, more preferably 10 to 35%. The actual sliding area is the area of the sliding surface excluding the recesses.

Further, in the form shown in FIG. 1, a plurality of recesses 4 are provided on the sliding surface 5 so as to be separated from each other in the length direction from the winding start end 2 to the winding end 3 of the spiral of the tip seal 1 (FIG. 1 shows). 44) They are installed side by side. The space between the adjacent recesses 4 is a part of the sliding surface 5 (sealing surface). The number of recesses is not particularly limited, and is appropriately set in consideration of the size of each recess. For example, the number is 10 to 50, preferably 30 to 50. The recesses 4 are preferably installed on the sliding surface 5 at equal intervals. As a result, the difference in frictional force between the sealed portions becomes small, and stable scrolling of the scroll member becomes possible.

The opening length of each recess 4 is preferably 1% to 20% of the unfolded length of the chip seal. 1% to 10% is more preferable, and 1% to 5% is even more preferable. By reducing the opening length, a large number can be arranged. For example, comparing the case where a small number of long recesses along the spiral are arranged and the case where a plurality of short recesses are arranged, even when the total area of the recesses is the same, the latter is better than the former for the tip seal. It is preferable because it is easy to suppress deformation and has excellent sealing properties. The unfolded length of the chip seal is the unfolded length of the spiral-shaped long member, which is the central position (from the inner peripheral surface and the outer peripheral surface) in the width W direction of the chip seal in the plan view of FIG. It is the total length of the center line 1c connecting the position of the distance). The opening length of the arc-shaped recess is the maximum length of the arc that opens on the inner peripheral surface or the outer peripheral surface of the recess (the length along the inner peripheral surface 1b between 4b-4b in FIG. 2).

As shown in FIG. 2, the planar shape of the concave portion 4 is an arc shape. Further, as shown in FIG. 3, the cross-sectional shape of the recess 4 is rectangular. Therefore, the concave portion 4 has an arcuate planar shape and has a shape formed vertically from the sliding surface 5 to a certain depth. Therefore, the concave portion 4 has the same planar shape at the sliding surface 5 and the planar shape at the deepest portion 4c. The arc radius R (see FIG. 2) of the arc surface 4a and its center position are not particularly limited, but it is preferable to set the recess so as not to exceed the center position in the width direction of the tip seal. For example, the radius R is preferably R2 mm to R4 mm when the size of the tip seal (substantial outer diameter of the spiral) is 70 mm. High sealing performance can be maintained by providing a plurality of recesses so as not to exceed the central position.

The depth d of the recess 4 (see FIG. 3) is preferably 45% or less of the thickness of the chip seal. 30% or less is preferable, and 15% or less is more preferable. The thickness T of the chip seal is between the sealing surface, which is a sliding surface, and the non-sealing surface. By setting the depth of the recess 4 to 45% or less of the thickness of the tip seal, the rigidity of the tip seal can be maintained and the frictional force on the sliding surface can be appropriately reduced even if the wear progresses. As a result, it is possible to ensure sufficient sealing performance while reducing the frictional force by providing a recess in which the sliding surface is partially cut out.

Further, as shown in the enlarged view in FIG. 2, the boundary portion 4b between the inner peripheral surface 1b of the spiral and the arc surface 4a is preferably R-shaped (for example, R0.5 mm or less). By providing such an R shape, it is possible to eliminate the edge of the boundary portion when the inner peripheral surface and the seal groove are in sliding contact with each other, and it becomes easier to introduce lubricating oil such as refrigerating machine oil into the recess. A stable lubrication state can be maintained and local deformation of the tip seal can be suppressed.

It is preferable that the area of the planar shape of the recess 4 is substantially the same between the recesses. As a result, the difference in frictional force between the sealed portions becomes small, and stable scrolling of the scroll member becomes possible. Here, as shown in FIG. 1, since the tip seal 1 of the present invention has a spiral shape, the radius of curvature gradually increases from the winding start end portion 2 to the winding end end portion 3. Therefore, it is not possible to unify the recesses 4 into a single arc shape and make the area of the plane shape the same. Therefore, in order to make the area of the plane shape of the recess substantially the same between the recesses while making the opening length of the recess almost the same, the tip seal is installed from the winding start end to the winding end. It is preferable to continuously or stepwise increase the arc radius of the concave portion. In the form shown in FIG. 1, the concave portion is divided into three stages of (1) winding start end 2 to X, (2) X to Y, and (3) Y to winding end end 3. The arc radius of is increased.

The chip seal 1 is a seal member for sealing a compression chamber formed between a fixed scroll which is a scroll member and a swirl wall of a movable scroll in a scroll type compressor. As shown in FIG. 3, the chip seal 1 is housed in the seal groove of the spiral wall 7 and is in sliding contact with the facing scroll substrate 6 to seal the compression chamber. The spiral wall 7 and the scroll substrate 6 face each other with a gap 8 (opposing distance D). It is preferable that the relationship between the depth d of the recess 4 and the facing distance D of the gap 8 is substantially the same, or the depth d of the recess 4 is slightly smaller. The chip seal 1 is accommodated in the seal groove of the spiral wall 7 with a gap, and rises from the bottom of the seal groove toward the scroll substrate 6 by the pressure of the gas 9 between the chip seal 1 and the scroll substrate 6 facing each other. The surfaced chip seal 1 is in sliding contact with the scroll substrate 6 on the sliding surface 5 and the seal groove wall 7a of the spiral wall 7 on the outer peripheral surface 1a, and scrolls with the spiral walls 7 of the fixed scroll and the movable scroll, which are scroll members. The compression chamber between the spiral walls of the substrate 6 is sealed.

Since the chip seal 1 has a plurality of the above-mentioned recesses 4 on the sliding surface 5, a part of the gas 9 in the compression chamber can be introduced into the recesses 4. Arrows 9a and 9b in the figure indicate the pressure received from the gas 9 on each surface. Due to the recess 4 in which the sliding surface 5 is partially cut out, the sliding area itself becomes smaller than that of the conventional product (FIG. 7) having no recess. The chip seal (44 recesses) of the present invention shown in FIGS. 1 to 3 and the conventional chip seal shown in FIG. 7 have the same dimensions except for the presence or absence of recesses. In this case, the actual sliding area is 75 in the present invention, assuming that the conventional product is 100, and the ratio of the total area of the recesses on the sliding surface (total recess area / (total recess area + actual sliding area) × 100). Is 25%. As the actual sliding area decreases, the surface pressure applied to the sliding surface increases and the friction coefficient decreases. As a result, the frictional force of the sliding surface becomes small. Further, as shown as the pressure of the gas, in the present invention, the gas pressure received by the anti-seal surface of the chip seal 1 is partially offset by the gas pressure received by the bottom surface of the recess by the gas introduced into the recess 4. However, since lubricating oil such as refrigerating machine oil is easily supplied to the sliding surface, the frictional force on the sliding surface can be significantly reduced as compared with the conventional product. The ratio of the total area of the recesses on the sliding surface (total recessed area / (total recessed area + actual sliding area) x 100) is 5 to 45%, and when it exceeds 45%, the surface pressure applied to the sliding surface. Will be reduced by the gas introduced into the recess 4.

Another example of the tip seal for a scroll type compressor of the present invention will be described with reference to FIGS. 4 and 5. FIG. 4 is a plan view of the chip seal of the present invention as viewed from the sliding surface side with the mating scroll member serving as the sealing surface, and FIG. 5 is a partially enlarged view thereof. As shown in FIGS. 4 and 5, the tip seal 1'has a plurality of recesses 4 in which the sliding surface 5 is partially cut out on the sliding surface 5 with the scroll member. The shape of this concave portion is a substantially rectangular shape along the spiral shape. Both long sides of the rectangle are curved along the shape of the spiral, the recesses are arranged on the inner peripheral surface 1b of the spiral, and one side of the long sides of the rectangle of each concave portion opens to the inner peripheral surface 1b of the spiral. ing.

The number of recesses, the opening length of each recess, the depth of the recesses, and the like are the same as those of the arcuate recesses shown in FIG. With respect to the planar shape, it is preferable to set the concave portion so as not to exceed the center position in the width direction of the tip seal.

As described above, by making the planar shape of the concave portion substantially rectangular along the arc shape or the spiral shape, the design and arrangement of the concave portion becomes easy, and the area is substantially the same especially when a plurality of concave portions are arranged. Such a design becomes easy. Further, although a chip seal having a recess on the sliding surface has been described based on each figure, the present invention is not limited to this, and particularly regarding the shape of the recess, a plurality of recesses in which the sliding surface is partially cut out are used. If the plurality of recesses are arranged on at least one of the inner peripheral surface and the outer peripheral surface of the spiral, and the individual recesses open to the inner peripheral surface or the outer peripheral surface and do not penetrate the inner peripheral surface and the outer peripheral surface. , Can be any shape. For example, instead of setting the depth of the concave portion to a constant depth, the shape of the deepest portion may be an inclined surface that extends to the opening side such as a hemispherical shape or a tapered shape.

The chip seal of the present invention is preferably made of synthetic resin. For example, a resin such as polyphenylene sulfide (PPS) resin, polyetheretherketone (PEEK) resin, or liquid crystal polymer is mixed with a fibrous filler such as carbon fiber or whisker, or a lubricant such as tetrafluoroethylene resin powder. It can be produced by injection molding using a resin composition.

The tip seal for a scroll type compressor of the present invention can reduce the frictional force between the scroll member and the tip seal while maintaining the sealing property, and can reduce the torque when the scroll member scrolls, so that it can be widely applied to the scroll type compressor. ..

1 Chip seal 2 Swirl winding start end 3 Swirl winding end end 4 Recess 5 Sliding surface 6 Scroll board 7 Swirl wall 8 Gap 9 Gas 11 Chip seal 12 Compression chamber 13 Seal groove 14 Fixed scroll 15 Movable scroll 16 Swirl Wall boundary

Claims (7)

A spiral-shaped chip seal for sealing a compression chamber formed between the fixed scroll and the movable scroll in a scroll type compressor provided with a fixed scroll and a movable scroll, which are scroll members.
The tip seal has a plurality of recesses in which the sliding surface is partially cut out on a sliding surface with the scroll member, and the plurality of recesses are arranged on at least one of the inner peripheral surface and the outer peripheral surface of the spiral. The individual recesses open to the inner or outer peripheral surface and do not penetrate the inner and outer peripheral surfaces.
The planar shape of the recess is arcuate, and the radius of the arc of the recess being installed increases continuously or stepwise from the winding start end to the winding end of the spiral of the tip seal. A featured tip seal for scroll compressors. The scroll type according to claim 1, wherein the ratio of the total area of the recesses on the sliding surface (total recess area / (total recess area + actual sliding area) x 100) is 5 to 45%. Chip seal for compressor. The scroll type compressor chip seal according to claim 1 or 2 , wherein the depth of the recess is 45% or less of the thickness of the chip seal. A plurality of the recesses are provided on the sliding surface at intervals in the length direction from the winding start end to the winding end of the spiral of the tip seal, and the opening length of each of the recesses is the tip. It is 1 to 20% of the unfolded length of the seal,
The tip seal for a scroll type compressor according to any one of claims 1 to 3 , wherein the space between the adjacent recesses is a part of the sliding surface. The tip seal for a scroll type compressor according to claim 4 , wherein the area of the planar shape of the concave portion is substantially the same between the concave portions. The tip seal for a scroll type compressor according to any one of claims 1 to 5 , wherein a plurality of the recesses are installed on the sliding surface at equal intervals. The chip seal for a scroll type compressor according to any one of claims 1 to 6 , wherein the chip seal is made of synthetic resin.

Images