CN119790229A

CN119790229A - Restricted components

Info

Publication number: CN119790229A
Application number: CN202380062562.6A
Authority: CN
Inventors: 铃木启志; 德永雄一郎
Original assignee: Eagle Industry Co Ltd
Current assignee: Eagle Industry Co Ltd
Priority date: 2022-11-17
Filing date: 2023-11-02
Publication date: 2025-04-08
Also published as: JPWO2024106230A1; EP4621234A1; KR20250041059A; WO2024106230A1

Abstract

A limiting component (9) having good sliding properties is provided. The limiting component (9) is arranged on the back side of a movable scroll (42) that slides relative to a fixed scroll (41) accompanying eccentric rotation, allowing the eccentric rotation of the movable scroll (42) and limiting the rotation thereof, wherein the limiting component (9) is formed with a dynamic pressure generating groove (94) that can generate dynamic pressure on the back side of the movable scroll (42).

Description

Limiting component

Technical Field

The present invention relates to a regulating member, for example, a regulating member used in a rotary machine including an eccentric mechanism.

Background

As a machine that accompanies rotation driving, there are not only a rotary machine that rotates with a center shaft held at a fixed position, but also a rotary machine that rotates with center shaft eccentrically, which are used in various industrial fields. One of the rotating machines that rotates with eccentricity is a scroll compressor that includes a fixed scroll having spiral wraps on the surface of an end plate and a movable scroll having spiral wraps on the surface of the end plate, and an eccentric mechanism that eccentrically rotates a rotation shaft, and that pressurizes fluid supplied from a low-pressure chamber on the outer diameter side of both scrolls by relatively sliding the movable scroll with respect to the fixed scroll with eccentric rotation by rotation of the rotation shaft, and that discharges high-pressure fluid from a discharge hole formed in the center of the fixed scroll.

These scroll compressors utilizing a mechanism of relatively sliding a movable scroll with respect to a fixed scroll by eccentric rotation have not only high compression efficiency but also low noise, and therefore, they are used in various fields such as refrigeration cycles, for example, but have a problem of leakage of refrigerant from an axial gap between both scrolls.

In the scroll compressor shown in patent document 1, a thrust bearing is disposed on the back surface side of the movable scroll, and the thrust bearing is disposed with an annular plate material. A plurality of spiral groove mechanisms are formed independently in the circumferential direction on the movable scroll-side surface of the annular plate material. Each spiral groove mechanism is provided with a plurality of grooves substantially radially toward a land portion in the center of the spiral groove mechanism. Specifically, each groove extends in the radial direction while being inclined counterclockwise from the central land portion, and one end on the land portion side is tapered and the other end on the opposite side from the land portion is wider than the one end.

The movable scroll eccentrically rotates in a state in which the rotation-stopped member is allowed to revolve and is restricted from rotating. The movable scroll moves from the other end of the groove toward one end upon eccentric rotation. Thus, the fluid on the outer diameter side or the inner diameter side of the annular plate is introduced into the groove, and a dynamic pressure is generated near one end of the groove. This makes it possible to raise the sliding property by forming a fluid film while floating between the sliding surfaces of the movable scroll and the annular plate, and to reduce leakage of refrigerant from the axial gap between the both scrolls by pressing the movable scroll against the fixed scroll.

Prior art literature

Patent literature

Patent document 1 Japanese patent laid-open No. 9-317666 (page 4, FIG. 4)

Disclosure of Invention

Problems to be solved by the invention

However, in the scroll compressor of patent document 1, although dynamic pressure is generated in the grooves of the spiral groove mechanism, there is a possibility that sufficient dynamic pressure cannot be obtained only by this.

The present invention has been made in view of such a problem, and an object thereof is to provide a restricting member having excellent sliding properties.

Means for solving the problems

In order to solve the above-described problems, a regulating member of the present invention is provided on a rear surface of a movable scroll that slides relative to a fixed scroll in association with eccentric rotation, and allows eccentric rotation of the movable scroll to regulate rotation, and a dynamic pressure generating groove capable of generating dynamic pressure is formed in a portion of the regulating member facing the movable scroll.

In this way, in the restriction member provided at a position different from the seal portion between the movable scroll and the thrust receiving mechanism, dynamic pressure is generated in the dynamic pressure generating grooves by the relative movement of the movable scroll and the thrust receiving mechanism, and the movable scroll and the thrust receiving mechanism can be separated from each other, so that the slidability can be improved.

The restriction member may be constituted by a pin inserted into a pocket provided in the movable scroll, and a rotor rotatably attached to the pin, the rotor being formed with the dynamic pressure generating groove.

Accordingly, the rotating body rotates following the eccentric rotation of the movable scroll, and therefore dynamic pressure can be generated regardless of the position of the movable scroll.

The rotating body may be eccentrically mounted to the pin.

This allows the rotor to smoothly rotate in response to the eccentric rotation of the movable scroll.

One end of the dynamic pressure generating groove may communicate with the outside of the rotating body.

This allows fluid to be smoothly introduced into the dynamic pressure generating grooves from the outside of the rotating body.

The dynamic pressure generating grooves may be formed in an arc shape.

This can efficiently generate dynamic pressure in response to the eccentric rotational movement.

The dynamic pressure generating grooves may be provided in the rotating body so as to face the bottom surface of the pocket.

Thus, the dynamic pressure can be received by a large area of the bottom surface of the pocket.

Drawings

Fig. 1 is a schematic configuration diagram showing a scroll compressor to which a rotation stopping mechanism as a restricting member of embodiment 1 of the present invention is applied.

Fig. 2 (a) is a schematic enlarged cross-sectional view showing the peripheral structure of the rotation stop mechanism of embodiment 1, fig. 2 (b) is a view of the rotating body seen from the front, and fig. 2 (c) is a view of the rotating body seen from the back.

Fig. 3 (a) is a schematic diagram showing a state in which the movable scroll is located at the 12-point position in the rotation locus, and fig. 3 (b) is a schematic diagram showing a state in which the movable scroll is located at the 3-point position in the rotation locus.

Fig. 4 (a) is a schematic diagram showing a state in which the movable scroll is located at the 6-point position in the rotation locus, and fig. 4 (b) is a schematic diagram showing a state in which the movable scroll is located at the 9-point position in the rotation locus.

Fig. 5 is a schematic cross-sectional view showing a state in which the front end surface of the rotating body and the bottom surface of the pocket slide relatively.

Fig. 6 is a schematic cross-sectional view showing a restricting member of embodiment 2 of the present invention.

Fig. 7 (a) is a schematic cross-sectional view showing a regulating member according to embodiment 3 of the present invention, and fig. 7 (b) is a schematic diagram showing a front surface of the regulating member.

Detailed Description

The following describes a mode of the restricting member for carrying out the present invention based on examples.

Example 1

The restricting member of embodiment 1 will be described with reference to fig. 1 to 5.

The restricting member of the present invention is applied to a rotary machine including an eccentric mechanism, for example, a scroll compressor C used in an air conditioning system of an automobile or the like, which sucks, compresses, and discharges a refrigerant as a fluid. In the present embodiment, the refrigerant is a gas, and is mixed with a mist of lubricating oil.

First, the scroll compressor C will be described. As shown in fig. 1, the scroll compressor C is mainly composed of an outer casing 1, a rotary shaft 2, an inner casing 3, a scroll compression mechanism 4, a side seal 7, a thrust plate 8 as a thrust receiving mechanism, a drive motor M, and a rotation stopping mechanism 9 as a restricting member.

The housing 1 is composed of a cylindrical case 11 and a cover 12 closing an opening of the case 11. The opening of the housing 11 on the axially opposite side of the opening closed by the cover 12 is closed by the drive motor M.

The casing 11 has a low-pressure chamber 20, which is an external space on the low-pressure side, to which a low-pressure refrigerant is supplied from a refrigerant circuit, not shown, through the suction port 10, a high-pressure chamber 30, from which a high-pressure refrigerant compressed by the scroll compression mechanism 4 is discharged, and a back-pressure chamber 50, which is an external space on the high-pressure side, to which a part of the refrigerant compressed by the scroll compression mechanism 4 and lubricating oil are supplied. The back pressure chamber 50 is formed inside the cylindrical inner case 3 housed inside the case 11.

The cover 12 is formed with a discharge communication passage 13 that communicates a refrigerant circuit, not shown, with the high-pressure chamber 30. The cap 12 is branched from the discharge communication passage 13 to form a part of the back pressure communication passage 14 that communicates the high pressure chamber 30 with the back pressure chamber 50. The discharge communication passage 13 is provided with an oil separator 6 for separating lubricating oil from the refrigerant.

The inner housing 3 is fixed with its axial end portion abutting against an end plate 41a of the fixed scroll 41 constituting the scroll compression mechanism 4. Further, a suction communication passage 15 penetrating in the radial direction is formed in the side wall of the inner case 3. That is, the low pressure chamber 20 is formed from the outside of the inner case 3 to the inside of the inner case 3 via the suction communication path 15. The refrigerant supplied to the inside of the inner housing 3 via the suction communication passage 15 is sucked by the scroll compression mechanism 4.

The scroll compression mechanism 4 mainly includes a fixed scroll 41 fixed to the cover 12 in a sealed manner and a movable scroll 42 accommodated in the inner housing 3.

The fixed scroll 41 is made of metal, and has a spiral wrap 41b protruding from the end plate 41a, which is a surface of the circular plate-shaped end plate 41a, toward the movable scroll 42. A recess 41c is formed in the fixed scroll 41, and the recess 41c is formed by recessing the end surface of the end plate 41a, which is the back surface of the end plate 41a, in the direction opposite to the cover 12 in the inner diameter side of the end surface of the end plate 41a that contacts the cover 12, and the high-pressure chamber 30 is partitioned by the recess 41c and the cover 12.

The movable scroll 42 is made of metal, and has a spiral wrap 42b protruding from the end plate 42a, which is a surface of the circular plate-shaped end plate 42a, toward the fixed scroll 41. Further, a protrusion 42c protruding from the center of the rear surface of the end plate 42a is formed on the movable scroll 42. The eccentric portion 2a formed on the rotation shaft 2 is fitted into the convex portion 42c so as to be rotatable relative to each other. In the present embodiment, the eccentric portion 2a of the rotary shaft 2 and the weight portion 2b protruding from the rotary shaft 2 in the outer radial direction constitute an eccentric mechanism that eccentrically rotates the rotary shaft 2.

A pocket 42d into which a rotation stopping mechanism 9 described later is inserted is formed in the back surface of the end plate 42a of the movable scroll 42. The pocket 42d is a bottomed hole.

When the rotary shaft 2 is rotationally driven by the drive motor M, the eccentric portion 2a eccentrically rotates. The pockets 42d of the movable scroll 42 are guided by the rotation stopping mechanism 9, and the movable scroll 42 slides relative to the fixed scroll 41 in association with the eccentric rotation while maintaining the posture. At this time, the movable scroll 42 eccentrically rotates with respect to the fixed scroll 41, and as the movable scroll rotates, the contact positions of the scroll wraps 41b and 42b sequentially move in the rotation direction, and the compression chamber 40 formed between the scroll wraps 41b and 42b gradually decreases while moving toward the center. As a result, the refrigerant sucked into the compression chamber 40 from the low-pressure chamber 20 formed on the outer diameter side of the scroll compression mechanism 4 is continuously compressed, and finally, the high-pressure refrigerant is discharged to the high-pressure chamber 30 through the discharge hole 41d provided in the center of the fixed scroll 41. The guiding of the movable scroll 42 by the rotation stopping mechanism 9 will be described in detail later.

Next, the side seal 7 will be described. The side seal 7 is made of elastically deformable resin, has a rectangular cross section and is annular when viewed in the axial direction, and the side seal 7 is fixed to the back surface of the end plate 42a of the movable scroll 42.

The side seal 7 is formed with a sliding surface 7a that abuts against a sliding surface 8a (see fig. 1) formed on the thrust plate 8. The sliding surface 7a is a flat surface, and forms a rear surface side sliding surface of the movable scroll 42.

Next, the thrust plate 8 will be described. The thrust plate 8 is made of metal, is annular, and is fixed with a seal ring 43, and the seal ring 43 is abutted against the inner bottom surface of the inner casing 3. Thus, the thrust plate 8 functions as a thrust receiving mechanism that receives the load in the axial direction of the movable scroll 42 via the side seal 7.

The side seal 7 and the seal ring 43 divide the low pressure chamber 20 formed on the outer diameter side of the movable scroll 42 and the back pressure chamber 50 formed on the back surface side of the movable scroll 42 in the inner housing 3. The back pressure chamber 50 is sealed with the rotary shaft 2 inserted through the through hole 3a by a seal ring 44, thereby forming a closed space, and the seal ring 44 is fixed to the inner periphery of the through hole 3a provided in the center of the inner casing 3.

A throttle, not shown, is provided in the back pressure communication path 14 formed throughout the cover 12, the fixed scroll 41, and the inner housing 3, and communicates the high pressure chamber 30 with the back pressure chamber 50, and the refrigerant in the high pressure chamber 30, which is depressurized and adjusted by the throttle, is supplied to the back pressure chamber 50 together with the lubricating oil separated by the oil separator 6. At this time, the pressure in the back pressure chamber 50 is adjusted to be higher than the pressure in the low pressure chamber 20. The inner casing 3 is formed with a pressure release hole 16 penetrating in the radial direction and communicating the low pressure chamber 20 with the back pressure chamber 50, and a pressure adjustment valve 45 is provided in the pressure release hole 16. The pressure regulating valve 45 is opened by the pressure in the back pressure chamber 50 exceeding a set value.

Further, a protrusion 42c of the movable scroll 42 is inserted through the through hole 8b in the center of the thrust plate 8. The through hole 8b is formed to have a diameter that allows the eccentric portion 2a of the rotary shaft 2 to be inserted into the convex portion 42c to eccentrically rotate. That is, the sliding surface 7a of the side seal 7 can slide relative to the sliding surface 8a of the thrust plate 8 by eccentric rotation of the rotary shaft 2 (see fig. 3 and 4).

Next, the rotation stopping mechanism 9 will be described. As shown in fig. 2 (a), the rotation stopping mechanism 9 is constituted by a pin 91 and a rotating body 92. The rotation stopping mechanism 9 is disposed on the inner diameter side of the side seal 7.

The pin 91 extends from the disk-shaped main body portion of the thrust plate 8 toward the movable scroll 42, and has a columnar shape. A plurality of (6 in the present embodiment) pins 91 are equally arranged in the circumferential direction of the thrust plate 8 (see fig. 3 and 4).

As shown in fig. 2 (a) to (c), the rotary body 92 is a disk-shaped member made of metal, and is provided with a concave portion 93 and a dynamic pressure generating groove 94. In fig. 2 (a), the dynamic pressure generating grooves 94 are shown deeper than the actual ones for convenience of explanation.

The diameter of the rotor 92 is smaller than the diameter of the pocket 42d of the movable scroll 42. In the present embodiment, the diameter of the pocket 42d is formed to be about 1.2 times the diameter of the rotator 92. The diameter of the pocket 42d is preferably about 1.1 to 1.5 times the diameter of the rotary body 92.

The recess 93 is opened on the thrust plate 8 side of the rotary body 92, and is provided on the outer peripheral surface side of the center of the rotary body 92. The tip end portion of the pin 91 is relatively rotatably inserted into the recess 93. That is, the rotating body 92 can eccentrically rotate with respect to the pin 91.

The front end surface 92a of the rotating body 92 and the bottom surface 42e of the pocket 42d are in contact with each other when the thrust plate 8 is not in operation, and are slightly separated from each other during relative rotation as will be described later (see fig. 5). The outer peripheral surface of the rotary body 92 is in pressure contact with the inner peripheral surface of the pocket 42 d.

The dynamic pressure generating grooves 94 are provided to open on the movable scroll 42 side of the rotating body 92. The dynamic pressure generating grooves 94 extend in an arc shape, and one end 94a communicates with the outside of the rotating body 92, and the other end 94b is closed.

Fig. 3 and 4 show the rotation locus of the movable scroll 42 as viewed from the fixed scroll 41 side.

Fig. 3 (a) shows the movable scroll 42 at the 12-point position in the rotation locus, and fig. 3 (b) shows the movable scroll 42 at the 3-point position in the rotation locus. Fig. 4 (a) shows the movable scroll 42 at the 6-point position in the rotation locus, and fig. 4 (b) shows the movable scroll 42 at the 9-point position in the rotation locus.

In the state of fig. 3 (a), the rotating body 92 is arranged at the 12-point position centering on the pin 91.

When the movable scroll 42 is shifted from the state of fig. 3 (a) to the state of fig. 3 (b), the rotor 92 rotates clockwise due to friction between the outer peripheral surface of the rotor 92 and the inner peripheral surface of the pocket 42d, and the rotor 92 is disposed at the 3-point position centering on the pin 91 in the state of fig. 3 (b).

At this time, since the plurality of pockets 42d are guided by the rotation stopping mechanism 9 at a plurality of positions in the circumferential direction, the movable scroll 42 eccentrically rotates in a state of maintaining the posture. In other words, the movable scroll 42 is guided by the plurality of rotation stopping mechanisms 9 in such a manner as to allow eccentric rotation and restrict rotation.

When the movable scroll 42 shifts from the state of fig. 3 (b) to the state of fig. 4 (a), the rotating body 92 rotates clockwise, and in the state of fig. 4 (a), the rotating body 92 is arranged at the 6-point position around the pin 91.

When the movable scroll 42 shifts from the state of fig. 4 (a) to the state of fig. 4 (b), the rotating body 92 rotates clockwise, and in the state of fig. 4 (b), the rotating body 92 is arranged at the 9-point position centering on the pin 91.

Since the movable scroll 42 eccentrically rotates in the state of being held in the posture, the rotating body 92 eccentrically rotates around the pin 91, and when the movable scroll 42 eccentrically rotates, the front end surface 92a of the rotating body 92 slides against the bottom surface 42e of the pocket 42d (see fig. 5).

The relative sliding between the front end surface 92a of the rotary body 92 and the bottom surface 42e of the pocket 42d will be described with reference to fig. 5. Fig. 5 is a view in which one of the rotating bodies 92 in fig. 3 (a) is cut and developed along the dynamic pressure generating grooves 94. For convenience of explanation, the dynamic pressure generating grooves 94 are shown to be deeper than the actual ones.

As shown in fig. 5, when the front end surface 92a of the rotating body 92 slides relative to the bottom surface 42e of the pocket 42d, the fluid in the dynamic pressure generating groove 94 moves from one end 94a toward the other end 94 b. Thus, dynamic pressure is generated at the other end 94b, and the front end surface 92a is slightly separated from the bottom surface 42e, thereby forming a fluid film based on fluid. Further, fluid is supplied from one end 94a to the dynamic pressure generating grooves 94 at any time.

Further, since the side seal 7 is disposed between the movable scroll 42 and the thrust plate 8 in a compressed state, even if the movable scroll 42 moves to the fixed scroll 41 due to the dynamic pressure of the dynamic pressure generating grooves 94, the sealing state between the movable scroll 42 and the thrust plate 8 can be maintained by elastic recovery of the side seal 7.

As described above, the rotation stopping mechanism 9 is formed with the dynamic pressure generating grooves 94 that can generate dynamic pressure on the back surface of the movable scroll 42. By this, the dynamic pressure is generated in the dynamic pressure generating grooves 94 by the relative movement of the movable scroll 42 and the thrust plate 8, and the movable scroll 42 and the thrust plate 8 can be separated from each other, so that the slidability of the movable scroll 42 and the thrust plate 8 can be improved.

Further, since the rotation stopping mechanism 9 having the dynamic pressure generating grooves 94 is provided on the inner diameter side of the side seal 7 which is a seal portion between the movable scroll 42 and the thrust plate 8, the fluid in the back pressure chamber 50 on the high pressure side does not leak into the low pressure chamber 20 on the low pressure side.

The rotation stopping mechanism 9 is composed of a pin 91 and a rotating body 92, the pin 91 is inserted into a pocket 42d provided in the movable scroll 42, the rotating body 92 is rotatably attached to the pin 91, and the rotating body 92 is formed with dynamic pressure generating grooves 94. Accordingly, the rotor 92 rotates following the eccentric rotation of the movable scroll 42, and thus dynamic pressure can be generated regardless of the position of the movable scroll 42.

The pin 91 is inserted into a recess 93 provided in the rear surface of the rotary body 92, and when dynamic pressure is generated in the dynamic pressure generating groove 94, the rotary body 92 can be restricted from moving to the rear surface side by the front end surface of the pin 91.

The rotating body 92 is eccentrically mounted on the pin 91. Accordingly, the rotor 92 can be smoothly rotated in response to the eccentric rotation of the movable scroll 42.

Further, since the one end 94a of the dynamic pressure generating groove 94 communicates with the outside of the rotating body 92, the fluid can be smoothly introduced into the dynamic pressure generating groove 94 from the outside of the rotating body 92.

Further, since the dynamic pressure generating grooves 94 are arc-shaped, dynamic pressure can be efficiently generated in response to the eccentric rotation of the rotating body 92.

The dynamic pressure generating grooves 94 are provided on the front end surface 92a of the rotating body 92 so as to face the bottom surface 42e of the pocket 42 d. As a result, the dynamic pressure can be received by the bottom surface 42e of the large-area pocket 42d, and therefore the dynamic pressure can be stably generated.

Example 2

Next, the regulating member of embodiment 2 will be described with reference to fig. 6. In addition, the repeated structural description of the same structure as that of the foregoing embodiment 1 is omitted.

As shown in fig. 6, the rotation stop mechanism 29 of embodiment 2 includes a pin 291 extending from the thrust plate 28 and a rotating body 292 eccentrically rotatably attached to the pin 291.

The rotator 292 is formed to have a smaller diameter than the pocket 242 d. The movable scroll 242 side of the rotating body 292 is inserted into the pocket 242d with play.

Then, in a state where the pin 291 is inserted into the recess 293, the rear surface 292b of the rotating body 292 abuts against the sliding surface 28a of the thrust plate 28. The back surface 292b is formed with dynamic pressure generating grooves 294.

When the movable scroll 242 eccentrically rotates, the rotating body 292 also eccentrically rotates with respect to the pin 291, and the rear surface 292b of the rotating body 292 slides against the sliding surface 28a of the thrust plate 28. Thus, dynamic pressure is generated in the dynamic pressure generating grooves 294, and the back surface 292b is slightly separated from the sliding surface 28a, thereby forming a fluid film by fluid.

Example 3

Next, the regulating member of embodiment 3 will be described with reference to fig. 7. In addition, the repeated structural description of the same structure as that of the foregoing embodiment 1 is omitted.

As shown in fig. 7, the rotation stop mechanism 39 of embodiment 3 is a pin 391 extending from the thrust plate 38 toward the movable scroll 342. The structures of the rotating bodies 92, 292 of embodiments 1,2 are omitted.

An arc-shaped dynamic pressure generating groove 394 is provided on the distal end surface 391a of the pin 391.

When the rotation shaft 2 (see fig. 1) rotates, the inner peripheral surface of the pocket 342d is guided by the pin 391, and the movable scroll 342 rotates eccentrically in a state of maintaining the posture, and the front end surface 391a of the pin 391 slides relative to the bottom surface 342e of the pocket 342 d. As a result, dynamic pressure is generated in dynamic pressure generating groove 394, and front end surface 391a is slightly separated from bottom surface 342e, thereby forming a fluid film based on fluid.

While the embodiments of the present invention have been described above with reference to the drawings, specific configurations are not limited to these embodiments, and modifications and additions within the scope of the gist of the present invention are also included in the present invention.

For example, in the above embodiments 1 to 3, the embodiment in which a plurality of restricting members are provided is exemplified, but at least one restricting member may be provided as long as the rotation of the movable scroll is restricted while allowing the eccentric rotation of the movable scroll.

In the embodiments 1 and 2, the rotary body is exemplified as a disk-shaped body, but the shape may be freely changed as long as the rotary body is guided along the inner peripheral surface of the pocket.

In the embodiments 1 to 3, the one dynamic pressure generating groove is provided for one regulating member, but a plurality of dynamic pressure generating grooves may be provided for one regulating member.

In the above embodiments 1 to 3, the dynamic pressure generating grooves are illustrated as being circular arc-shaped, but may extend linearly in the circumferential direction, for example, and the shape thereof may be freely changed.

In the above embodiments 1 to 3, the mode in which one end of the dynamic pressure generating grooves communicates with the space outside is exemplified, but for example, the dynamic pressure generating grooves may be formed in a shape separated from the space outside such as a pit.

In the embodiments 1 to 3, the mode in which the regulating member is disposed on the inner diameter side of the side seal, that is, the back pressure chamber is exemplified, but the regulating member may be disposed on the outer diameter side of the side seal, that is, the low pressure chamber.

In the embodiments 1 to 3, the rotary body is made of metal, but the material of the rotary body may be freely selected according to the use environment and the like.

In the embodiments 1 to 3, the description has been made of the way in which the thrust plate as the thrust receiving means is applied to the scroll compressor C used in the air conditioning system of the automobile or the like, but the invention is not limited thereto, and the invention may be applied to, for example, a scroll expansion compressor having an expander and a compressor integrally, as long as the rotary machine includes an eccentric mechanism.

In the above embodiments 1 to 3, the case where the outer diameter side of the thrust plate is the low pressure side and the inner diameter side is the high pressure side was described, but the outer diameter side of the thrust plate may be the high pressure side and the inner diameter side may be the low pressure side.

The fluid present in the inner and outer spaces of the sliding surface of the thrust receiving mechanism may be gas, liquid, or a mixed state of gas and liquid.

In the embodiments 1 to 3, the manner in which the side seal and the thrust plate slide relatively was described, but the back surface of the movable scroll may slide directly relatively to the thrust plate.

In the embodiments 1 and 2, the manner in which the rotating body is in contact with the tip of the pin is illustrated, but the tip of the pin may not be in contact with the rotating body, and for example, the recess of the rotating body may be a through hole instead of a bottomed hole, and the rear surface of the rotating body may be in contact with the sliding surface 28a of the thrust plate in the state in which the rotating body is inserted into the pin.

In the embodiments 1 to 3, the manner in which the front end surface of the rotating body and the bottom surface of the pocket are brought into contact with each other when the thrust plate is not in operation and separated when the thrust plate is rotated relatively is described, but the dynamic pressure may be generated by the relative rotation or may be separated when the thrust plate is not in operation.

Description of the reference numerals

4, Side seal, 8, thrust plate (thrust bearing mechanism), 9, anti-rotation mechanism (limiting member), 20, low pressure chamber, 28, thrust plate, 29, anti-rotation mechanism (limiting member), 30, high pressure chamber, 38, thrust plate, 39, anti-rotation mechanism (limiting member), 41, fixed scroll, 42, movable scroll, 42d, pocket, 42e, 50, back pressure chamber, 91, 92a, front end face, 94, dynamic pressure generating groove, 94a, one end, 94b, 242, movable scroll, 242d, pocket, 291, 292, 294, dynamic pressure generating groove, 342d, pocket, 342e, bottom face, 391a front end face, 394, dynamic pressure generating groove, C, vortex compressor.

Claims

1. A limiting member, which is provided on the back side of a movable scroll that slides relative to a fixed scroll with eccentric rotation, allows the eccentric rotation of the movable scroll and limits its rotation, wherein:

A dynamic pressure generating groove capable of generating dynamic pressure is formed in a portion of the restricting member facing the movable scroll.

2. The limiting member according to claim 1, wherein:

The restricting member is composed of a pin and a rotating body. The pin is inserted into a pocket provided in the movable scroll. The rotating body is rotatably mounted on the pin. The dynamic pressure generating groove is formed on the rotating body.

3. The limiting member according to claim 2, wherein:

The rotating body is eccentrically mounted on the pin.

4. The limiting member according to claim 2, wherein:

One end of the dynamic pressure generating groove is communicated with the outside of the rotating body.

5. The limiting member according to claim 2, wherein:

The dynamic pressure generating groove is in an arc shape.

6. The limiting member according to any one of claims 2 to 4, wherein:

The dynamic pressure generating groove is provided on the rotating body so as to face the bottom surface of the pocket.