WO2021205555A1 - 摺動部品 - Google Patents
摺動部品 Download PDFInfo
- Publication number
- WO2021205555A1 WO2021205555A1 PCT/JP2020/015743 JP2020015743W WO2021205555A1 WO 2021205555 A1 WO2021205555 A1 WO 2021205555A1 JP 2020015743 W JP2020015743 W JP 2020015743W WO 2021205555 A1 WO2021205555 A1 WO 2021205555A1
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- WIPO (PCT)
- Prior art keywords
- dimple
- dimples
- sliding
- angle
- sliding surface
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/16—Sealings between relatively-moving surfaces
- F16J15/34—Sealings between relatively-moving surfaces with slip-ring pressed against a more or less radial face on one member
- F16J15/3404—Sealings between relatively-moving surfaces with slip-ring pressed against a more or less radial face on one member and characterised by parts or details relating to lubrication, cooling or venting of the seal
- F16J15/3408—Sealings between relatively-moving surfaces with slip-ring pressed against a more or less radial face on one member and characterised by parts or details relating to lubrication, cooling or venting of the seal at least one ring having an uneven slipping surface
- F16J15/3424—Sealings between relatively-moving surfaces with slip-ring pressed against a more or less radial face on one member and characterised by parts or details relating to lubrication, cooling or venting of the seal at least one ring having an uneven slipping surface with microcavities
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/16—Sealings between relatively-moving surfaces
- F16J15/34—Sealings between relatively-moving surfaces with slip-ring pressed against a more or less radial face on one member
- F16J15/3404—Sealings between relatively-moving surfaces with slip-ring pressed against a more or less radial face on one member and characterised by parts or details relating to lubrication, cooling or venting of the seal
- F16J15/3408—Sealings between relatively-moving surfaces with slip-ring pressed against a more or less radial face on one member and characterised by parts or details relating to lubrication, cooling or venting of the seal at least one ring having an uneven slipping surface
- F16J15/3412—Sealings between relatively-moving surfaces with slip-ring pressed against a more or less radial face on one member and characterised by parts or details relating to lubrication, cooling or venting of the seal at least one ring having an uneven slipping surface with cavities
Definitions
- the present invention relates to a pair of sliding parts that slide relative to each other on a sliding surface, for example, a mechanical seal, a plain bearing, and other sliding parts suitable for a sliding part.
- a sliding component such as a sealing ring or a bearing, which needs to prevent a fluid from leaking from the sliding surface while reducing friction by interposing a fluid in the sliding surface.
- a sealing device for preventing leakage of the fluid to be sealed a device consisting of a pair of sliding parts that slide relative to each other on the sliding surface (for example, a mechanical seal) is known.
- a sealing device it is necessary to maintain a high sealing property while reducing the sliding torque by forming a fluid lubricating film with a fluid to be sealed between the sliding surfaces.
- a technique of arranging a plurality of dimples on the sliding surface is known as one method for realizing high sealing performance and low sliding torque.
- dimples having a circular opening on the sliding surface can be arranged so as to be lined up on a virtual circumference centered on the rotation center of the sliding component to realize high sealing performance and low sliding torque. Has been done. (See, for example, Patent Document 1).
- dimples having an elongated track-shaped opening are arranged at a predetermined dimple angle ⁇ , and the circular length L1 of the dimples on the circle passing through the center of the dimples and the circle of the land portion between the adjacent dimples on the same circle. It is known that by setting the ratio L1 / L2 to the circumferential length L2 to 0.001 ⁇ L1 / L2 ⁇ 0.1, the sealing property and sliding torque of the dimple as a whole can be optimally adjusted. (See, for example, Patent Document 2).
- Patent Document 1 can achieve high sealing performance and low sliding torque under specific operating conditions, but cannot achieve high sealing performance and low sliding torque in a wide rotation speed range.
- An object of the present invention is to provide a pair of sliding parts that slide relative to each other on a sliding surface, which can realize high sealing performance and low sliding torque even when used in a wide rotation speed range. And.
- the sliding parts of the present invention are A pair of sliding parts that slide relative to each other on the sliding surface.
- At least one of the sliding surfaces includes a group of dimples in which dimples having a major axis and a minor axis whose openings are orthogonal to each other are arranged in the radial and circumferential directions.
- the dimple angle formed by the radial axis passing through the intersection of the long axis and the short axis of the dimple and the center of the sliding surface with the long axis is at least the radial direction or the circumferential direction of the sliding surface. It is characterized by changing in one direction.
- the suction effect and the dynamic pressure effect of the dimples constituting the dimple group can be changed, so that various operating conditions can be obtained.
- Dimples suitable for can be arranged, and high sealing performance and low sliding torque can be realized.
- the sliding component of the present invention is The dimple angle is characterized in that it changes at a constant rate in the radial direction. According to this feature, the suction effect and the dynamic pressure effect of the dimples can be changed in the radial direction by changing the dimple angle of the dimples constituting the dimple group at a constant ratio in the radial direction.
- the sliding component of the present invention is The dimple angle is characterized in that it changes discontinuously in the radial direction. According to this feature, by changing the dimple angle discontinuously in the radial direction, the suction effect and dynamic pressure effect of the dimples constituting the dimple group can be changed discontinuously in the radial direction, and a specific range. A group of dimples suitable for operating conditions can be placed in.
- the sliding component of the present invention is The dimple angle is characterized in that the rate of change in the radial direction changes in the radial direction. According to this feature, by changing the rate of change of the dimple angle in the radial direction in the radial direction, dimples suitable for each usage condition can be easily arranged in the radial direction.
- the sliding component of the present invention is The dimple angle is large on the leak side of the sliding surface and small on the sealed fluid side of the sliding surface.
- the dimples arranged on the leak side have a large dimple angle, so that the suction effect becomes predominant, and the dimples can suck the fluid from the leak side to make the leak extremely small.
- the dimples arranged on the sealed fluid side have a small dimple angle, the dynamic pressure effect becomes predominant, so that the dimples can discharge the fluid having a high pressure and reduce the sliding torque.
- the dimple angle is characterized in that it changes at a constant rate in the circumferential direction. According to this feature, the fluid holding effect, suction effect, and sealing effect of the dimples can be changed in the circumferential direction by changing the dimple angle of the dimples constituting the dimple group at a constant ratio in the circumferential direction.
- the sliding component of the present invention is The dimple angle is characterized in that it changes discontinuously in the circumferential direction. According to this feature, by changing the dimple angle discontinuously in the circumferential direction, the suction effect and dynamic pressure effect of the dimples constituting the dimple group can be changed discontinuously in the circumferential direction, and a specific range. A group of dimples suitable for operating conditions can be placed in.
- the sliding component of the present invention is The dimple angle is characterized in that the rate of change in the circumferential direction changes in the circumferential direction. According to this feature, by changing the rate of change of the dimple angle in the radial direction in the circumferential direction, dimples suitable for each usage condition can be easily arranged in the circumferential direction.
- the sliding component of the present invention is
- the sliding surface has a plurality of regions defined by a land portion extending in the radial direction.
- the dimple group is characterized in that it is arranged in the region. According to this feature, dimples suitable for various operating conditions can be arranged in each region, and high sealing performance and low sliding torque can be realized.
- the sliding component of the present invention is The shape of the opening of the dimple is elliptical. According to this feature, it is possible to arrange dimples suitable for various operating conditions by utilizing the difference in suction effect and dynamic pressure effect in the long axis direction and the short axis direction of elliptical dimples, and by extension, high sealing performance and low sealing performance. Sliding torque can be realized.
- It is a WW arrow view of FIG. 1, and is a figure which shows an example of the sliding surface of the sliding component which concerns on Example 1 of this invention.
- It is a WW arrow view of FIG. 1, and is a figure which shows an example of the sliding surface of the sliding component which concerns on Example 2 of this invention.
- It is a WW arrow view of FIG. 1, and is a figure which shows an example of the sliding surface of the sliding component which concerns on Example 3 of this invention.
- It is a WW arrow view of FIG. 1, and is a figure which shows an example of the sliding surface of the sliding component which concerns on Example 4 of this invention.
- 7A-7D show a modified example of the change mode of the dimple angle ⁇ in the radial direction of the sliding surface S.
- 8A-8D show a modified example of the change mode of the dimple angle ⁇ in the circumferential direction of the sliding surface S.
- a mechanical seal which is an example of a sliding component
- the present invention is not limited to this, and for example, the lubricating oil is sealed on one side of the cylindrical sliding surface in the axial direction.
- it can also be used as a sliding component of a bearing that slides on a rotating shaft.
- the outer peripheral side of the sliding parts constituting the mechanical seal will be described as the sealed fluid side (high pressure fluid side), and the inner peripheral side will be described as the leakage side (low pressure fluid side, for example, the atmospheric side).
- FIG. 1 is a vertical cross-sectional view showing an example of the mechanical seal 1, which is an inside type in which a fluid to be sealed that tends to leak from the outer periphery of the sliding surface S toward the inner circumference is sealed. It consists of a rotating cartridge and a fixed cartridge.
- the rotating cartridge is a packing 8 that seals between the sleeve 2 fitted to the rotating shaft 100, the annular rotating side sealing ring 3 which is one of the sliding parts, and the sleeve 2 and the rotating side sealing ring 3.
- the rotating cartridge rotates together with the rotating shaft 100.
- the fixed-side cartridge includes a housing 4 attached to the casing 9, an annular fixed-side sealing ring 5 which is the other sliding component, a bellows 7 that seals the fixed-side sealing ring 5 and the housing 4, and a fixed-side cartridge.
- a coiled wave spring 6 for urging the sealing ring 5 toward the rotating side sealing ring 3 via the bellows 7 is provided, and the housing 4 is fixed to the casing 9 in the rotational direction and the axial direction.
- FIG. 1 shows a case where the width of the sliding surface of the rotating side sealing ring 3 is wider than the width of the sliding surface of the fixed side sealing ring 5, but the case is not limited to this, and in the opposite case. Of course, the present invention can also be applied.
- the materials of the rotating side sealing ring 3 and the fixed side sealing ring 5 are selected from silicon carbide (SiC) having excellent wear resistance and carbon having excellent self-lubricating property.
- SiC silicon carbide
- both are SiC or rotating.
- the side sealing ring 3 is made of SiC and the fixed side sealing ring 5 can be combined with carbon.
- a plurality of dimples 11 are arranged in the fixed side sealing ring 5.
- the dimple 11 is a recess having an opening 11a surrounded by a flat sliding surface S and a bottom recessed from the sliding surface S, and the opening 11a of the dimple 11 is a long axis orthogonal to each other. It has a shape having L and a minor axis K. Further, the dimples 11 are arranged apart from each other with the land portion R interposed therebetween.
- the long axis L is a fictitious line that passes through the center of gravity G of the shape of the opening 11a and connects the maximum width portion of the opening 11a
- the short axis K is the center of gravity G of the opening 11a. It is a fictitious line connecting the openings 11a facing each other in the direction orthogonal to the long axis L.
- the opening 11a of the dimple 11 in this embodiment will be described by taking an ellipse having an orthogonal major axis L and a minor axis K as an example.
- the shape is not limited to an ellipse, and any shape having an orthogonal major axis and a minor axis can be oval, rhombic, triangular, rectangular, polygonal, or any closed curve 91, 92, 93, as shown in FIG. It may consist of 94.
- the function of the dimple 11 will be described.
- the fluid between the sliding surfaces S and the fluid in the dimples 11 move due to the viscosity of the rotating-side sealing ring 3. It moves according to the direction. Since the flow path of the fluid flowing into the dimple 11 rapidly expands, a negative pressure is generated on the upstream side of the dimple 11 and cavitation occurs. However, since the magnitude of the negative pressure in the cavitation is limited by the value of the vapor pressure of the fluid, it does not become a large negative pressure.
- the fluid is boosted to a positive pressure by the wedge effect (dynamic pressure effect) due to the rapid contraction of the flow path. Due to the negative pressure generated on the upstream side of the dimple 11, the dimple 11 exerts a suction effect of sucking the surrounding fluid.
- the fluid boosted by the wedge effect is supplied to the sliding surface S, and the fluid lubrication state is maintained between the sliding surfaces S.
- the dimple angle ⁇ includes the radial axis r passing through the intersection (center G) of the major axis L and the minor axis K of the center C of the sliding surface S and the dimple 11, and the major axis L.
- the angle ⁇ between.
- the dimple 11 has different suction effect and dynamic pressure effect depending on the dimple angle ⁇ size.
- the dimple angle ⁇ 90 °, that is, when the long axis L of the dimple 11 is arranged in the circumferential direction, the dimple 11 has a higher function of holding the fluid.
- the dimple angle ⁇ about 45 °, the suction effect of the dimple 11 becomes high.
- the dimple angle is 0 °, that is, when the long axis L of the dimple 11 is arranged in the radial direction, the dynamic pressure effect becomes high.
- the suction effect can be strengthened or the dynamic pressure effect can be strengthened. can. Furthermore, by changing the elliptical shape and depth, dimples with various characteristics can be obtained.
- the dimple group 60 is configured by arranging sub-dimple groups 62 and 63 arranged in a line in the radial direction in a predetermined number (120 in the example of FIG. 2) in the circumferential direction at equal intervals.
- Sub-dimple groups 62 are arranged in a radial direction on one peripheral edge (leakage side) of the sliding surface S, and sub-dimple group 63 is radially arranged on the other peripheral edge (sealed fluid side) of the sliding surface S. Are arranged in a row.
- the dimples 62a, 62b, 62c, 62d, 62e, and the dimples 63a, 63b, 63c, 63d, 63e are formed into ellipses having substantially the same opening shape and depth.
- the sub-dimple group 62 and the sub-dimple group 63 are each composed of five dimples, but the present invention is not limited to this.
- the number of dimples constituting the sub-dimple group 62 and the sub-dimple group 63 may be 5 or more, 5 or less, or different numbers from each other.
- the number of sub-dimple groups 62 and sub-dimple groups 63 is 120, respectively, on the sliding surface, but may be more or less than 120. Further, although the sub-dimple groups 62 and 63 arranged in the radial direction are arranged at equal intervals in the circumferential direction, they may be arranged unevenly in the circumferential direction.
- the group 62 as a whole exhibits a high suction effect.
- the sub-dimple group 63 as a whole exhibits a high dynamic pressure effect.
- the sub-dimple group 62 sucks the fluid from the leak side, so that the leak can be extremely reduced.
- the sub-dimple group 63 having a high dynamic pressure effect on the sealed fluid side of the sliding surface, the sub-dimple group 63 supplies the fluid with a high pressure to the sliding surface S, so that the sliding torque is increased. It can be extremely small.
- the sliding component of the first embodiment has the following effects. 1.
- the dimple 11 Due to the negative pressure generated on the upstream side of the dimple 11, the dimple 11 exerts a suction effect of sucking the surrounding fluid.
- the dimple 11 supplies the fluid boosted by the wedge effect to the sliding surface S on the downstream side, the fluid lubrication effect of the sliding surface S is enhanced.
- the sub-dimple group 62 sucks the fluid from the leak side, so that the leak can be extremely reduced.
- the sealing property can be improved, and the sub-dimple group 63 having a high dynamic pressure effect is arranged on the sealed fluid side of the sliding surface.
- the sliding torque can be made extremely small, so that high sealing performance and low sliding torque can be realized for the dimple group 60 as a whole.
- a sliding component having high sealing performance and low sliding torque can be obtained.
- FIG. 3 shows the sliding surface S of the sliding component according to the second embodiment.
- the dimple group 70 of the second embodiment is different from the first embodiment in that the dimple angle ⁇ changes at a constant rate in the radial direction.
- the same members and configurations as those in the first embodiment are designated by the same reference numerals, and redundant description will be omitted.
- the dimple group 70 is configured by arranging a predetermined number of sub-dimple groups 72 arranged in a line in the radial direction (120 in the example of FIG. 2) at equal intervals in the circumferential direction.
- the sub-dimple group 72 is configured by arranging dimples 72a, 72b, 72c, 72d, 72e, 72f, 72g, 72h, 72i, 72j in the radial direction with the land portion R interposed therebetween.
- dimples 72a, 72b, 72c, 72d, 72e, 72f, 72g, 72h, 72i, 72j are referred to as "dimples 72a-72j").
- the dimples 72a-72j constituting the sub-dimple group 72 are ellipses having the same shape, so that the suction effect and the dynamic pressure effect can be continuously changed.
- the dimples 72a-72j constituting the sub-dimple group 72 the dimples 72a arranged on the leak-side peripheral edge 5a side of the sliding surface have a dimple angle of 45 °, and the suction effect is the highest. Further, since the dimple angle becomes large toward the sealed fluid side, the suction effect is gradually weakened, and the dynamic pressure effect of the dimples 72j arranged on the peripheral edge 5b side of the sliding surface on the sealed fluid side is the highest. Become.
- the suction effect and the dynamic pressure effect can be continuously changed.
- the dimples 72a-72j suitable for the respective usage conditions exist.
- the mechanical seal 1 can reduce leakage and reduce sliding torque even when the usage conditions change.
- the sliding parts of the second embodiment have the following effects in addition to the effects of the first embodiment. Since the dimple angle ⁇ of the dimples 72a-72j constituting the dimple group 70 continuously changes at a constant rate in the radial direction, the suction effect and the dynamic pressure effect can be continuously changed. As a result, even when the usage conditions such as the rotation speed and the pressure change, the dimples 72a-72j suitable for the respective usage conditions exist. As a result, the mechanical seal 1 can reduce leakage and reduce sliding torque even when the usage conditions change.
- FIG. 4 shows the sliding surface S of the sliding component according to the third embodiment.
- Other configurations are the same as in the second embodiment.
- the same members and configurations as those in the second embodiment are designated by the same reference numerals, and redundant description will be omitted.
- the dimple group 10 is configured by arranging a predetermined number of sub-dimple groups 12 arranged in a row in the radial direction (120 in the example of FIG. 2) at equal intervals in the circumferential direction.
- the sub-dimple group 12 is configured by arranging dimples 12a, 12b, 12c, 12d, 12e, 12f, 12g, 12h, 12i, 12j in the radial direction with the land portion R interposed therebetween (hereinafter, dimples 12a, 12b, 12c, 12d, 12e, 12f, 12g, 12h, 12i, 12j are referred to as "dimples 12a-12j").
- the dimple angle ⁇ of the dimples 12a-12j constituting the sub-dimple group 12 changes from 90 ° to 0 ° in the radial direction from the dimple 12a on the leak side toward the dimple 12j on the sealed fluid side at a constant rate in the radial direction.
- the dimples 12a-12j have substantially the same shape and size of the ellipse of the opening.
- the number of dimples constituting the sub-dimple group 12 may be more or less than 10. Further, the number of sub dimple groups 12 arranged on the sliding surface S may be more than 120 or less.
- the dimple angle ⁇ of the dimples 12a-12j constituting the sub-dimple group 12 changes at a constant rate in the radial direction.
- the dimples 12a, 12b, and 12c arranged on the leak side having a low peripheral speed have a large dimple angle ⁇ , so that the function of holding the fluid is enhanced.
- the dimple angle ⁇ 90 ° to 70 on the inner diameter side of the sliding surface S.
- the dynamic pressure effect can be enhanced.
- the dimples 12g, 12h, 12i, and 12j arranged on the sealed fluid side having a high peripheral speed supply the fluid with a high pressure to the sliding surface S due to the dynamic pressure effect.
- the fluid lubrication state can be maintained.
- the sliding parts of the third embodiment have the following effects in addition to the effects of the first embodiment.
- the dimples 12a, 12b, 12c having a high fluid retention function are arranged on the inner diameter side of the sliding surface S having a low peripheral speed, so that the dimples 12a, 12b, 12c It is possible to prevent the fluid held inside from being supplied to the sliding surface S and becoming poorly lubricated. 3.
- the fluid is sucked into the dimples 12d, 12e, 12f from the sealed fluid side, so that the flow to the leak side is suppressed, so that the sealing property can be improved.
- the dimples 12g, 12h, 12i, and 12j having a small dimple angle ⁇ are arranged on the sealed fluid side having a high peripheral speed, the dynamic pressure effect can be enhanced.
- the dimples 12g, 12h, 12i, and 12j arranged on the sealed fluid side having a high peripheral speed supply the fluid with a high pressure to the sliding surface S due to the dynamic pressure effect.
- the fluid lubrication state can be maintained.
- FIG. 5 shows the sliding surface S of the sliding component according to the fourth embodiment, so that the dimple angle ⁇ of the dimples constituting the dimple group 80 is constant in the radial direction and continuously changes in the circumferential direction. It differs from the first embodiment in that it is arranged in. Other configurations are the same as in the first embodiment.
- the same members and configurations as those in the first embodiment are designated by the same reference numerals, and redundant description will be omitted.
- the sliding surface S of the fixed-side sealing ring 5 is divided into a predetermined number of regions 20 (4 in the example of FIG. 4) by land portions R provided from the sealed fluid side to the leaking side. ing.
- a dimple group 80 is arranged in each region.
- 30 sub dimple groups from the sub dimple group 21 to the sub dimple group 50 are arranged at equal intervals in the circumferential direction with the land portion R interposed therebetween.
- nine dimples are arranged in a radial direction at equal intervals.
- each of the sub dimple groups 21-50 is not limited to this, and the number may be more or less than nine. Further, the number of sub-dimple groups arranged in each region is not limited to 30, and may be more or less than 30.
- a sub-dimple group 21 is arranged at one end (upstream side in the rotation direction) of the region 20, and a sub-dimple group 50 is arranged at the other end (downstream side in the rotation direction) of the region 20. Is arranged.
- the sub-dimple group 21 has dimples 21a, 21b, 21c, 21d, 21e, 21d, 21f in a row with a land portion sandwiched from one peripheral edge (leakage side) of the sliding surface S to the other peripheral edge (sealed fluid side).
- 21g, 21h, 21i (hereinafter referred to as "dimples 21a-21i") are arranged and configured.
- the sub-dimple group 50 has dimples 50a, 50b, 50c, 50d, 50e, 50d, 50f, 50g, 50h, 50i (hereinafter, 50i) in a row with a land portion sandwiched from the leak side of the sliding surface S to the sealed fluid side. It is configured by arranging (denoted as "dimples 50a-50i").
- the sliding component of the fourth embodiment has the following effects. 1.
- the dimple angle of the dimple group arranged in the circumferential direction of the region 20 changes in the circumferential direction
- the fluid holding effect, the suction effect, and the sealing effect of the dimples are continuous in the circumferential direction from the upstream side to the downstream side in the rotation direction.
- dimple groups having different characteristics are evenly distributed from the sub dimple group 21 to the sub dimple group 50, so that dimple groups suitable for various operating conditions are arranged, and high sealing is performed under various operating conditions. It is possible to realize the property and low sliding torque.
- FIG. 7A-7D show a modified example of the change mode of the dimple angle ⁇ in the radial direction of the sliding surface S.
- the dimple angle ⁇ can be changed in the radial direction so as to meet the required operating conditions.
- FIG. 7A corresponds to the embodiment of FIG. 2, and is a case where the dimple angle changes discontinuously in the radial direction of the sliding surface S.
- the dimple angle ⁇ of the dimples forming the sub-dimple group arranged on the leak side of the sliding surface S and the dimple angle ⁇ of the dimples forming the sub-dimple group arranged on the sealed fluid side of the sliding surface S Is set to a different size.
- FIG. 7B is a modification of FIG. 7A, in which the rate of change of the dimple angle on the leak side of the sliding surface and the rate of change of the dimple angle on the sealed fluid side of the sliding surface are different.
- the dimples constituting the dimple group arranged on the leak side of the sliding surface S all have a constant dimple angle ⁇ , and although the dimple angle does not change, they are arranged on the sealed fluid side of the sliding surface S.
- the dimple angle ⁇ of the dimples constituting the dimple group changes at a constant rate in the radial direction.
- FIG. 7C corresponds to the embodiment of FIGS. 3 and 4, and the dimple angle ⁇ of the dimples constituting the dimple group is set so as to change at a constant rate in the radial direction.
- FIG. 7D shows a case where the rate of change of the dimple angle on the leak side of the sliding surface and the rate of change of the dimple angle on the sealed fluid side of the sliding surface are different.
- the dimple angle ⁇ of the dimples forming the dimple group arranged on the leak side of the sliding surface S changes at a constant rate in the radial direction.
- the dimple angles ⁇ of the dimples forming the sub-dimple group arranged on the sealed fluid side of the sliding surface S all have a constant dimple angle ⁇ , and the dimple angles do not change.
- the dimple angle ⁇ can be changed in the circumferential direction so as to meet the required operating conditions.
- FIG. 8A shows a case where the dimple angle changes discontinuously from one side to the other in a region provided in the circumferential direction of the sliding surface.
- FIG. 8B shows a case where the rate of change of the dimple angle on one side of the region and the rate of change of the dimple angle on the other side of the region are different.
- FIG. 8C corresponds to the embodiment of FIG. 5, and shows a case where the dimple angle changes at a constant rate in the circumferential direction.
- FIG. 8D shows a case where the rate of change of the dimple angle on one side of the region and the rate of change of the dimple angle on the other side of the region are different.
- Example 1-3 the dimple angles of the dimples constituting the dimple group changed in the radial direction and were constant in the circumferential direction. Further, in Example 4, the dimple angles of the dimples constituting the dimple group changed in the circumferential direction and were constant in the radial direction. However, not limited to this, the dimple angle of the dimples constituting the dimple group can be set to change in the radial direction and the circumferential direction so as to meet the required operating conditions.
- the shapes, sizes, and depths of the dimples 11 constituting the dimple group are the same, but at least one of the shapes, sizes, and depths of the adjacent dimples may be different. .. Further, the shape, size, and depth of the dimples may be different for each sub-dimple group.
- the outer peripheral side is the sealed fluid side and the inner peripheral side is the leak side, but it is not limited to this, and it can be applied when the inner peripheral side is the sealed fluid side and the outer peripheral side is the leak side.
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Abstract
Description
摺動面にて互いに相対摺動する一対の摺動部品であって,
少なとも一方の前記摺動面は,開口部の形状が直交する長軸及び短軸を有するディンプルを径方向及び周方向に配置してなるディンプル群を備え,
前記ディンプルの前記長軸と前記短軸との交点と,前記摺動面の中心と,を通る半径方向軸が前記長軸となすディンプル角度は,摺動面の径方向又は周方向のうち少なくとも一方向に変化することを特徴としている。
この特徴によれば,ディンプル角度が径方向又は周方向のうち少なくとも一方向に変化することにより,ディンプル群を構成するのディンプルの吸込み効果及び動圧効果を変えることができるので,種々の運転条件に適合したディンプルを配置でき,延いては高い密封性及び低摺動トルクを実現できる。
前記ディンプル角度は,径方向に一定の割合で変化することを特徴としている。
この特徴によれば,ディンプル群を構成するディンプルのディンプル角度を径方向に一定の割合で変化させることにより,ディンプルの吸込み効果及び動圧効果を径方向に変えることができる。
前記ディンプル角度は,径方向に不連続に変化することを特徴としている。
この特徴によれば,ディンプル角度は,径方向に不連続に変化させることで,ディンプル群を構成するディンプルの吸込み効果及び動圧効果を径方向に不連続に変化せることができ,特定の範囲に運転条件に適合したディンプル群を配置できる。
前記ディンプル角度の径方向の変化割合が,径方向に変化することを特徴としている。
この特徴によれば,ディンプル角度の径方向の変化割合が,径方向に変化させることで,容易にそれぞれの使用条件に適合したディンプルを径方向に配置できる。
前記ディンプル角度は,前記摺動面の漏れ側で大きく,前記摺動面の被密封流体側で小さいことを特徴としている。
この特徴によれば,漏れ側に配設されるディンプルはディンプル角度が大きいので吸込み効果が優勢になり,ディンプルは漏れ側から流体を吸込んで漏れを極めて小さくできる。また,被密封流体側に配設されるディンプルはディンプル角度が小さいので動圧効果が優勢になるので,ディンプルは圧力の高い流体を吐き出して,摺動トルクを低減できる。
この特徴によれば,ディンプル群を構成するディンプルのディンプル角度を周方向に一定割合で変化せせることにより,ディンプルの流体保持効果,吸込み効果,密封効果を周方向に変化させることができる。
前記ディンプル角度は,周方向に不連続に変化することを特徴としている。
この特徴によれば,ディンプル角度は,周方向に不連続に変化させることで,ディンプル群を構成するディンプルの吸込み効果及び動圧効果を周方向に不連続に変化せることができ,特定の範囲に運転条件に適合したディンプル群を配置できる。
前記ディンプル角度の周方向の変化割合が,周方向に変化することを特徴としている。
この特徴によれば,ディンプル角度の径方向の変化割合が,周方向に変化させることで,容易にそれぞれの使用条件に適合したディンプルを周方向に配置できる。
前記摺動面は径方向に延びるランド部により区画される複数の領域を備え,
前記ディンプル群は前記領域に配設されることを特徴としている。
この特徴によれば,各領域に,種々の運転条件に適合したディンプルを配置でき,延いては高い密封性及び低摺動トルクを実現できる。
前記ディンプルの前記開口部の形状は楕円であることを特徴としている。
この特徴によれば,楕円ディンプルの長軸方向,短軸方向の吸込み効果及び動圧効果の違いを利用して,種々の運転条件に適合したディンプルを配置でき,延いては高い密封性及び低摺動トルクを実現できる。
1.ディンプル11の上流側において発生する負圧により,ディンプル11は周囲の流体を吸込む吸込み効果を発揮する。一方,ディンプル11は下流側において,くさび効果により昇圧した流体を摺動面Sに供給するので,摺動面Sの流体潤滑効果を高める。
2.ディンプル11は直交する長軸及び短軸を有する楕円の開口部を有するので,ディンプル角度θ大きさを変えることによって,その吸込み効果及び動圧効果を変えることができる。ディンプル角度θ=90°でディンプル11を配置した場合には,ディンプル11は流体を保持する機能が高くなる。ディンプル角度θ=約45°の場合にはディンプル11の吸込み効果が高くなる。また,ディンプル角度0°には,ディンプル11の動圧効果が高くなる。このように,同じ楕円形状を有するディンプル11であっても,ディンプル角度を変えてディンプル11を配置することによって,吸込み効果を強くしたり,動圧効果を強くしたりすることができる。
3.ディンプル角度θ=約45°でディンプル11を配列したサブディンプル群62は吸込み効果が高くなる。したがって,吸込み効果の高いサブディンプル群62を摺動面の漏れ側に配置することにより,サブディンプル群62は漏れ側から流体を吸込むので,漏れを極めて小さくできる。
4.ディンプル角度θ=約0°でディンプル11を配列したサブディンプル群63は動圧効果が高くなる。したがって,動圧効果の高いサブディンプル群63を摺動面の被密封流体側に配置することにより,サブディンプル群63は摺動面Sに高い圧力の流体を供給するので,摺動トルクを極めて小さくできる。
5.高い吸込み効果を有するサブディンプル群62を摺動面の漏れ側に配置することにより,密封性を向上でき,また,動圧効果の高いサブディンプル群63を摺動面の被密封流体側に配置することにより,摺動トルクを極めて小さくできるので,ディンプル群60全体として高い密封性及び低い摺動トルクを実現できる。これにより,高い密封性及び低い摺動トルクを備えた摺動部品とすることができる。
ディンプル群70を構成するディンプル72a-72jのディンプル角度θは径方向に一定の割合で連続して変化するので,吸込み効果と動圧効果を連続的に変化させることができる。これにより,回転数や圧力等の使用条件が変化する場合であっても,それぞれの使用条件に適合したディンプル72a-72jが存在するようになる。これにより,メカニカルシール1は使用条件が変化する場合でも漏れを小さくでき,摺動トルクを小さくすることができる。
1.ディンプル群10を構成するディンプル12a-12jは同じ形状を有する楕円であっても,ディンプル12a-12jのディンプル角度θが径方向に一定の割合で連続的に変化させることによって,吸込み効果と動圧効果を連続的に変化させることができる。
2.周速の低い漏れ側には,ディンプル角度θ=90°~70°のディンプル12a,12b,12cが配置されるので,流体を保持する機能が高くなる。特に,低速回転数で運転される場合であっても,周速の低い摺動面Sの内径側に流体保持機能の高いディンプル12a,12b,12cを配置することにより,ディンプル12a,12b,12c内に保持された流体が摺動面Sに供給され,貧潤滑状態となるのを防ぐことができる。
3.摺動面Sの中央部には,ディンプル角度θ=45°のディンプル12d,12e,12fが配置されるので,吸込み効果が高くなる。これにより,被密封流体側から流体をディンプル12d,12e,12f内に吸い込むので,漏れ側への流れを抑制するので,密封性を向上できる。
4.周速の高い被密封流体側には,ディンプル角度θが小さいディンプル12g,12h,12i,12jが配置されるので,動圧効果を高めることができる。これにより,周速の高い被密封流体側に配設されるディンプル12g,12h,12i,12jは,動圧効果により高い圧力の流体を摺動面Sに供給するので,摺動面S間は流体潤滑状態を保つことができる。
1.領域20の回転方向上流側にはディンプル角度=90°のサブディンプル群21が配設されるので,吸込み効果及び動圧効果よりもディンプル内に流体を保持する保持効果が優勢になる。また,領域20の回転方向下流側にはディンプル角度=0°のサブディンプル群50が配設されるので,吸込み効果よりも動圧効果が優勢になる。さらに,領域20の上流側と下流側の間の中間の流域にはディンプル角度=45°のディンプル群が配設されるので,吸込み効果が優勢になる。
2.領域20の周方向に配設されるディンプル群のディンプル角度が周方向に変化するので,回転方向上流側から下流側に亘ってディンプルの流体保持効果,吸込み効果,密封効果を周方向に連続して変化させることができる。これにより,サブディンプル群21からサブディンプル群50へ特性の異なるディンプル群が万遍なく分布するので,種々の運転条件に適合したディンプル群が配置されるようになり,種々の運転条件で高い密封性及び低摺動トルクを実現できる。
2 スリーブ
3 回転側密封環
4 ハウジング
5 固定側密封環
5a 漏れ側周縁
5b 被密封流体側周縁
6 コイルドウェーブスプリング
7 ベローズ
8 パッキン
9 ケーシング
100 回転軸
10 ディンプル群
11 ディンプル
11a 開口部
12 サブディンプル群
12a ディンプル
12b ディンプル
12c ディンプル
12d ディンプル
12e ディンプル
12f ディンプル
12g ディンプル
12h ディンプル
12i ディンプル
12i ディンプル
12j ディンプル
20 領域
21 サブディンプル群
21a ディンプル
21b ディンプル
21c ディンプル
21d ディンプル
21e ディンプル
21f ディンプル
21g ディンプル
21h ディンプル
21j ディンプル
22 ディンプル群
30 サブディンプル群
40 サブディンプル群
49 サブディンプル群
50 サブディンプル群
50a ディンプル
50b ディンプル
50c ディンプル
50d ディンプル
50e ディンプル
50f ディンプル
50g ディンプル
50h ディンプル
50j ディンプル
60 ディンプル群
62 サブディンプル群
62a ディンプル
62b ディンプル
62c ディンプル
62d ディンプル
62e ディンプル
63 サブディンプル群
63a ディンプル
63b ディンプル
63c ディンプル
63d ディンプル
63e ディンプル
70 ディンプル群
72 サブディンプル群
72a ディンプル
72b ディンプル
72c ディンプル
72d ディンプル
72e ディンプル
72f ディンプル
72g ディンプル
72h ディンプル
72i ディンプル
72j ディンプル
80 ディンプル群
K 短軸
L 長軸
R ランド部
S 摺動面
θ ディンプル角度
Claims (10)
- 摺動面にて互いに相対摺動する一対の摺動部品であって,
少なとも一方の前記摺動面は,開口部の形状が直交する長軸及び短軸を有するディンプルを径方向及び周方向に配置してなるディンプル群を備え,
前記ディンプルの前記長軸と前記短軸との交点と,前記摺動面の中心と,を通る半径方向軸が前記長軸となすディンプル角度は,摺動面の径方向又は周方向のうち少なくとも一方向に変化することを特徴とする摺動部品。 - 前記ディンプル角度は,径方向に一定の割合で変化することを特徴とする請求項1に記載の摺動部品。
- 前記ディンプル角度は,径方向に不連続に変化することを特徴とする請求項1に記載の摺動部品。
- 前記ディンプル角度の径方向の変化割合が,径方向に変化することを特徴とする請求項1に記載の摺動部品。
- 前記ディンプル角度は,前記摺動面の漏れ側で大きく,前記摺動面の被密封流体側で小さいことを特徴とする請求項1ないし4のいずれかに記載の摺動部品。
- 前記ディンプル角度は,周方向に一定の割合で変化することを特徴とする請求項1ないし5のいずれかに記載の摺動部品。
- 前記ディンプル角度は,周方向に不連続に変化することを特徴とする請求項1ないし5のいずれかに記載の摺動部品。
- 前記ディンプル角度の周方向の変化割合が,周方向に変化することを特徴とする請求項1ないし5のいずれかに記載の摺動部品。
- 前記摺動面は径方向に延びるランド部により区画される複数の領域を備え,
前記ディンプル群は前記領域に配設されることを特徴とする請求項1ないし8のいずれかに記載の摺動部品。 - 前記ディンプルの前記開口部の形状は楕円であることを特徴とする請求項1ないし9のいずれかに記載の摺動部品。
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| JP2022513757A JP7414968B2 (ja) | 2020-04-07 | 2020-04-07 | 摺動部品 |
| PCT/JP2020/015743 WO2021205555A1 (ja) | 2020-04-07 | 2020-04-07 | 摺動部品 |
| KR1020227030699A KR102744483B1 (ko) | 2020-04-07 | 2020-04-07 | 슬라이딩 부품 |
| EP20930551.5A EP4102113B1 (en) | 2020-04-07 | 2020-04-07 | Sliding component |
| CN202080098310.5A CN115280044A (zh) | 2020-04-07 | 2020-04-07 | 滑动部件 |
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| US (1) | US12038087B2 (ja) |
| EP (1) | EP4102113B1 (ja) |
| JP (1) | JP7414968B2 (ja) |
| KR (1) | KR102744483B1 (ja) |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004204935A (ja) * | 2002-12-25 | 2004-07-22 | Eagle Ind Co Ltd | シール装置 |
| JP2005180652A (ja) * | 2003-12-22 | 2005-07-07 | Eagle Ind Co Ltd | 摺動部品 |
| JP2010133496A (ja) | 2008-12-04 | 2010-06-17 | Eagle Ind Co Ltd | 摺動部品 |
| JP5456772B2 (ja) | 2009-05-25 | 2014-04-02 | イーグル工業株式会社 | シール装置 |
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| JPS5760513Y2 (ja) | 1977-09-29 | 1982-12-23 | ||
| US6902168B2 (en) * | 2002-03-19 | 2005-06-07 | Eagle Industry Co., Ltd. | Sliding element |
| JP4495402B2 (ja) * | 2002-03-19 | 2010-07-07 | イーグル工業株式会社 | 摺動部品 |
| JP4205910B2 (ja) * | 2002-04-02 | 2009-01-07 | イーグル工業株式会社 | 摺動部品 |
| JP4316956B2 (ja) * | 2002-10-23 | 2009-08-19 | イーグル工業株式会社 | 摺動部品 |
| US20090200749A1 (en) * | 2006-07-25 | 2009-08-13 | Eagle Industry Co., Ltd. | Mechanical seal device |
| CN201916486U (zh) * | 2010-12-11 | 2011-08-03 | 浙江工业大学 | 一种负压型槽端面机械密封结构 |
| CN104165228B (zh) * | 2014-07-25 | 2016-04-13 | 浙江工业大学 | 一种似含羞草型孔簇端面机械密封结构 |
| WO2016203878A1 (ja) * | 2015-06-15 | 2016-12-22 | イーグル工業株式会社 | 摺動部品 |
| EP3543552B1 (en) * | 2016-11-18 | 2021-11-10 | Eagle Industry Co., Ltd. | Sliding members |
| EP3575643B1 (en) * | 2017-01-30 | 2023-03-22 | Eagle Industry Co., Ltd. | Sliding component |
| WO2019069887A1 (ja) * | 2017-10-03 | 2019-04-11 | イーグル工業株式会社 | 摺動部品 |
| KR102407098B1 (ko) * | 2018-01-12 | 2022-06-10 | 이구루코교 가부시기가이샤 | 슬라이딩 부품 |
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| JP2004204935A (ja) * | 2002-12-25 | 2004-07-22 | Eagle Ind Co Ltd | シール装置 |
| JP2005180652A (ja) * | 2003-12-22 | 2005-07-07 | Eagle Ind Co Ltd | 摺動部品 |
| JP2010133496A (ja) | 2008-12-04 | 2010-06-17 | Eagle Ind Co Ltd | 摺動部品 |
| JP5456772B2 (ja) | 2009-05-25 | 2014-04-02 | イーグル工業株式会社 | シール装置 |
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| JPWO2021205555A1 (ja) | 2021-10-14 |
| US12038087B2 (en) | 2024-07-16 |
| EP4102113C0 (en) | 2025-08-13 |
| KR20220137090A (ko) | 2022-10-11 |
| KR102744483B1 (ko) | 2024-12-18 |
| EP4102113B1 (en) | 2025-08-13 |
| US20230095849A1 (en) | 2023-03-30 |
| EP4102113A4 (en) | 2023-10-18 |
| JP7414968B2 (ja) | 2024-01-16 |
| CN115280044A (zh) | 2022-11-01 |
| EP4102113A1 (en) | 2022-12-14 |
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