Restricting member

Abstract

Provided is a restricting member having excellent sliding properties. A restricting member (9), which is provided on the rear surface of a movable scroll (42) that slides relative to a fixed scroll (41) in conjunction with eccentric rotation, allows eccentric rotation of the movable scroll (42) and restricts rotation of the movable scroll (42), and in which a dynamic pressure generating groove (94) capable of generating dynamic pressure on the rear surface of the movable scroll (42) is formed.

Description

Technical Field

[0001] The present invention relates to a restriction component, for example, to a restriction component used in a rotating machine including an eccentric mechanism. Background Art

[0002] Regarding the machines driven by rotation used in various industrial fields, there are not only rotating machines whose central axis rotates while being kept at a fixed position, but also rotating machines whose central axis rotates eccentrically. As one of the rotating machines rotating eccentrically, there are scroll compressors, etc. Such compressors are the following mechanisms: having a scroll compression mechanism, an eccentric mechanism, etc., the scroll compression mechanism is composed of a fixed scroll having a spiral vortex on the surface of an end plate and a movable scroll having a spiral vortex on the surface of an end plate, the eccentric mechanism causes the rotating shaft to rotate eccentrically, and the movable scroll slides relative to the fixed scroll with the eccentric rotation by the rotation of the rotating shaft, thereby pressurizing the fluid provided from the low-pressure chamber on the outer diameter side of the two scrolls, and ejecting the high-pressure fluid from the ejection hole formed in the center of the fixed scroll.

[0003] These scroll compressors utilize a mechanism in which a movable scroll plate slides relative to a fixed scroll plate as it rotates eccentrically, and have high compression efficiency and low noise, and are therefore used in many areas such as refrigeration cycles. However, there is a problem of refrigerant leakage from the axial gap between the two scroll plates.

[0004] The scroll compressor shown in Patent Document 1 is provided with a thrust bearing on the back side of the movable scroll, and the thrust bearing is provided with an annular plate. A plurality of spiral groove mechanisms are independently formed along the circumferential direction on the surface of the movable scroll side of the annular plate. Each spiral groove mechanism is provided with a plurality of grooves in a substantially radial manner toward the central land portion of the spiral groove mechanism. In detail, each groove is inclined counterclockwise from the central land portion and extends radially, one end of the land portion side is tapered, and the other end on the side opposite to the land portion is wider than the one end.

[0005] The movable scroll plate rotates eccentrically while being allowed to revolve and restricted from rotating by the anti-rotation component. The movable scroll plate moves from the other end of the groove toward one end when rotating eccentrically. As a result, the fluid on the outer diameter side or the inner diameter side of the annular plate is introduced into the groove, and dynamic pressure is generated near one end of the groove. As a result, a fluid film can be formed while floating between the sliding surface of the movable scroll plate and the annular plate to improve the sliding property, and the movable scroll plate can be pressed against the fixed scroll plate to reduce the leakage of refrigerant from the axial gap between the two scroll plates.

[0006] Prior art literature

[0007] Patent Literature

[0008] Patent Document 1: Japanese Patent Application Laid-Open No. 9-317666 (page 4, Figure 4 ) Summary of the invention

[0009] Problems to be solved by the invention

[0010] However, in the scroll compressor of Patent Document 1, although the grooves of the spiral groove mechanism generate dynamic pressure, sufficient dynamic pressure may not be obtained by this alone.

[0011] The present invention has been made in view of such problems, and an object of the present invention is to provide a regulating member having excellent sliding properties.

[0012] Means for solving problems

[0013] In order to solve the above-mentioned problem, the limiting component of the present invention is arranged on the back side of the movable scroll disk that slides relative to the fixed scroll disk along with the eccentric rotation, allowing the eccentric rotation of the movable scroll disk and limiting the rotation, wherein a dynamic pressure generating groove capable of generating dynamic pressure is formed in the portion of the limiting component facing the movable scroll disk.

[0014] Thus, in the limiting component arranged at a position different from the sealing portion between the movable scroll and the thrust receiving mechanism, dynamic pressure is generated in the dynamic pressure generating groove by the relative movement of the movable scroll and the thrust receiving mechanism, so that the movable scroll and the thrust receiving mechanism can be separated, thereby improving the sliding performance.

[0015] The restricting member may be composed of a pin and a rotating body, the pin being inserted into a pocket provided in the movable scroll, the rotating body being rotatably mounted on the pin, and the dynamic pressure generating groove being formed on the rotating body.

[0016] Thus, the rotor rotates following the eccentric rotation of the movable scroll, and thus dynamic pressure can be generated regardless of the position of the movable scroll.

[0017] The rotating body may be eccentrically mounted on the pin.

[0018] Thereby, the rotor can be smoothly rotated according to the eccentric rotation of the movable scroll.

[0019] One end of the dynamic pressure generating groove may be in communication with the outside of the rotating body.

[0020] Thus, the fluid can be smoothly introduced into the dynamic pressure generating groove from the outside of the rotating body.

[0021] The dynamic pressure generating groove may be in an arc shape.

[0022] Thereby, it is possible to efficiently generate dynamic pressure in accordance with the eccentric rotational motion.

[0023] The dynamic pressure generating groove may be provided on the rotating body so as to face a bottom surface of the pocket.

[0024] Thus, the dynamic pressure can be received by the large area of ​​the bottom surface of the pocket. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic structural diagram showing a scroll compressor to which a rotation-stop mechanism as a restricting member according to the first embodiment of the present invention is applied.

[0026] Figure 2 (a) is a schematic enlarged cross-sectional view showing the peripheral structure of the anti-rotation mechanism of Example 1, Figure 2 (b) is a diagram of the rotating body viewed from the front. Figure 2 (c) is a diagram of the rotating body viewed from the back.

[0027] Figure 3 (a) is a schematic diagram showing a state where the movable scroll is located at the 12 o'clock position in the rotation trajectory, Figure 3 (b) is a schematic diagram showing a state where the movable scroll is located at the 3 o'clock position on the rotation trajectory.

[0028] Figure 4 (a) is a schematic diagram showing a state where the movable scroll is located at the 6 o'clock position in the rotation trajectory, Figure 4 (b) is a schematic diagram showing a state where the movable scroll is located at the 9 o'clock position in the rotation trajectory.

[0029] Figure 5 It 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 are sliding relative to each other.

[0030] Figure 6 This is a schematic cross-sectional view showing a restriction member according to a second embodiment of the present invention.

[0031] Figure 7 (a) is a schematic cross-sectional view showing a limiting member according to Embodiment 3 of the present invention, Figure 7 (b) is a schematic diagram showing the front side of the limiting component. DETAILED DESCRIPTION

[0032] Hereinafter, the mode for implementing the restricting member of the present invention will be described based on the examples.

[0033] Example 1

[0034] Reference Figures 1 to 5 The restricting member of the first embodiment will be described.

[0035] The limiting 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, etc., which sucks, compresses, and discharges a refrigerant as a fluid. In this embodiment, the refrigerant is a gas mixed with mist-like lubricating oil.

[0036] First, the scroll compressor C will be described. Figure 1 As shown, the scroll compressor C is mainly composed of an outer shell 1, a rotating shaft 2, an inner shell 3, a scroll compression mechanism 4, a side seal 7, a thrust plate 8 as a thrust receiving mechanism, a driving motor M and a stop mechanism 9 as a limiting component.

[0037] The housing 1 is composed of a cylindrical case 11 and a cover 12 that closes an opening of the case 11. The opening of the case 11 on the axially opposite side to the opening closed by the cover 12 is closed by the drive motor M.

[0038] Inside the shell 11, there are formed: a low-pressure chamber 20 as an external space on the low-pressure side, to which a low-pressure refrigerant is supplied from a refrigerant circuit (not shown) via the suction port 10; a high-pressure chamber 30, to which a high-pressure refrigerant compressed by the scroll compression mechanism 4 is ejected; and a back-pressure chamber 50 as 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. In addition, the back-pressure chamber 50 is formed inside the cylindrical inner shell 3 accommodated inside the shell 11.

[0039] The cover 12 is formed with a discharge communication passage 13 that connects a refrigerant circuit (not shown) with the high-pressure chamber 30. The cover 12 also forms a portion of a back-pressure communication passage 14 that branches from the discharge communication passage 13 and connects the high-pressure chamber 30 with the back-pressure chamber 50. In addition, the discharge communication passage 13 is provided with an oil separator 6 that separates lubricating oil from the refrigerant.

[0040] The inner shell 3 is fixed in a state where the axial end portion abuts against the end plate 41a of the fixed scroll 41 constituting the scroll compression mechanism 4. In addition, a suction communication passage 15 penetrating in the radial direction is formed on the side wall of the inner shell 3. That is, the low-pressure chamber 20 is formed from the outside of the inner shell 3 to the inside of the inner shell 3 via the suction communication passage 15. The refrigerant supplied to the inside of the inner shell 3 via the suction communication passage 15 is sucked into the scroll compression mechanism 4.

[0041] The scroll compression mechanism 4 is mainly composed of a fixed scroll 41 fixed to the cover 12 in a sealed manner, and a movable scroll 42 accommodated in the inner casing 3 .

[0042] The fixed scroll 41 is made of metal and has a spiral volute 41b protruding from the surface of a circular plate-shaped end plate 41a, that is, the end plate 41a, toward the movable scroll 42. In addition, a recess 41c is formed on the fixed scroll 41. The recess 41c is obtained by recessing the inner diameter side of the back side of the end plate 41a, that is, the end surface of the end plate 41a that contacts the cover 12 in the opposite direction to the cover 12. The high-pressure chamber 30 is divided by the recess 41c and the cover 12.

[0043] The movable scroll 42 is made of metal and has a spiral volute 42b protruding from the surface of the circular plate-shaped end plate 42a, that is, the end plate 42a toward the fixed scroll 41. In addition, a convex portion 42c protruding from the center of the back side of the end plate 42a is formed on the movable scroll 42. The eccentric portion 2a formed on the rotating shaft 2 can be inserted into the convex portion 42c so as to rotate relatively. In addition, in this embodiment, the eccentric portion 2a of the rotating shaft 2 and the counterweight portion 2b protruding from the rotating shaft 2 in the outer diameter direction constitute an eccentric mechanism for causing the rotating shaft 2 to rotate eccentrically.

[0044] Furthermore, a pocket 42d into which a rotation-stopping mechanism 9 described later is inserted is formed on the back surface of the end plate 42a of the movable scroll 42. The pocket 42d is a bottomed hole.

[0045] When the rotating shaft 2 is driven to rotate by the driving motor M, the eccentric portion 2a rotates eccentrically. The movable scroll 42 is guided by the stop mechanism 9 through the pocket hole 42d of the movable scroll 42, and the movable scroll 42 slides relatively with the fixed scroll 41 while maintaining its posture and eccentrically rotating. At this time, the movable scroll 42 rotates eccentrically relative to the fixed scroll 41, and with this rotation, the contact position of the volutes 41b and 42b moves in sequence along the rotation direction, and the compression chamber 40 formed between the volutes 41b and 42b gradually shrinks 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 ejected to the high-pressure chamber 30 through the ejection hole 41d provided in the center of the fixed scroll 41. In addition, the guidance of the movable scroll 42 by the stop mechanism 9 will be described in detail later.

[0046] 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 is fixed to the back surface of the end plate 42 a of the movable scroll 42 .

[0047] The side seal 7 is formed with a sliding surface 8a (see Figure 1 ) abuts against the sliding surface 7a. The sliding surface 7a is a flat surface and constitutes the back side sliding surface of the movable scroll 42.

[0048] Next, the thrust plate 8 will be described. The thrust plate 8 is made of metal and has an annular shape. A seal ring 43 is fixed to the thrust plate 8, and the seal ring 43 abuts against the inner bottom surface of the inner casing 3. Thus, the thrust plate 8 functions as a thrust receiving mechanism that receives the axial load of the movable scroll 42 via the side seal 7.

[0049] 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 from the back pressure chamber 50 formed on the back side of the movable scroll 42 in the inner shell 3. The back pressure chamber 50 is sealed by the seal ring 44 between the rotating shaft 2 inserted through the through hole 3a, and the seal ring 44 is fixed to the inner periphery of the through hole 3a provided in the center of the inner shell 3 to form a closed space.

[0050] In addition, a throttle portion (not shown) is provided on the back pressure communication passage 14 formed through the cover 12, the fixed scroll 41, and the inner shell 3 and communicating the high pressure chamber 30 with the back pressure chamber 50, and the refrigerant in the high pressure chamber 30 after decompression adjustment by the throttle portion 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. In addition, the inner shell 3 is formed with a pressure release hole 16 that penetrates in the radial direction and communicates the low pressure chamber 20 with the back pressure chamber 50, and a pressure regulating valve 45 is provided in the pressure release hole 16. The pressure regulating valve 45 is opened when the pressure in the back pressure chamber 50 exceeds the set value.

[0051] The convex portion 42c of the movable scroll 42 is inserted through the through hole 8b at 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 rotating shaft 2 inserted into the convex portion 42c to rotate eccentrically. That is, the sliding surface 7a of the side seal 7 can slide relative to the sliding surface 8a of the thrust plate 8 accompanying the eccentric rotation of the rotating shaft 2 (see FIG. Figure 3 and Figure 4 ).

[0052] Next, the anti-rotation mechanism 9 will be described. Figure 2 As shown in (a) of FIG. 8 , the anti-rotation mechanism 9 is composed of a pin 91 and a rotating body 92 . The anti-rotation mechanism 9 is arranged on the inner diameter side of the side seal 7 .

[0053] The pin 91 extends from the disk-shaped main body of the thrust plate 8 toward the movable scroll 42 and has a cylindrical shape. A plurality of the pins 91 (six in this embodiment) are evenly arranged along the circumferential direction of the thrust plate 8 (see Figure 3 and Figure 4 ).

[0054] like Figure 2As shown in (a) to (c) of FIG. 1 , the rotating body 92 is a metal disk-shaped member and is provided with a recess 93 and a dynamic pressure generating groove 94. Figure 2 In (a), for the sake of convenience of explanation, the dynamic pressure generating groove 94 is shown as being deeper than it actually is.

[0055] The diameter of the rotating body 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 rotating body 92. In addition, the diameter of the pocket 42d is preferably about 1.1 to 1.5 times the diameter of the rotating body 92.

[0056] The recess 93 opens on the thrust plate 8 side of the rotating body 92 and is provided closer to the outer peripheral surface than the center of the rotating body 92. The tip of the pin 91 is relatively rotatably inserted into the recess 93. That is, the rotating body 92 can eccentrically rotate relative to the pin 91.

[0057] 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 described later (see Figure 5 ). In addition, the outer peripheral surface of the rotating body 92 is pressed against the inner peripheral surface of the pocket 42d.

[0058] The dynamic pressure generating groove 94 is provided to open on the movable scroll 42 side of the rotating body 92. The dynamic pressure generating groove 94 extends in an arc shape, one end 94a of the dynamic pressure generating groove 94 communicates with the outside of the rotating body 92, and the other end 94b is closed.

[0059] Figure 3 and Figure 4 The rotation locus of the movable scroll 42 as viewed from the fixed scroll 41 side is shown.

[0060] exist Figure 3 (a) shows that when the movable scroll 42 is at the 12 o'clock position in the rotation trajectory, Figure 3 (b) shows the movable scroll 42 at the 3 o'clock position in the rotation trajectory. Figure 4 (a) shows that when the movable scroll 42 is located at the 6 o'clock position in the rotation trajectory, Figure 4 (b) shows the movable scroll 42 being located at the 9 o'clock position in the rotation trajectory.

[0061] exist Figure 3 In the state (a), the rotating body 92 is arranged at the 12 o'clock position with the pin 91 as the center.

[0062] When the movable scroll 42 is Figure 3 The state of (a) is transferred to Figure 3In the state (b), due to the friction between the outer peripheral surface of the rotating body 92 and the inner peripheral surface of the pocket hole 42d, the rotating body 92 rotates clockwise. Figure 3 In the state (b), the rotating body 92 is arranged at the 3 o'clock position with the pin 91 as the center.

[0063] At this time, the movable scroll 42 rotates eccentrically while maintaining its posture because the pockets 42d are guided by the detent mechanisms 9 at multiple locations in the circumferential direction. In other words, the movable scroll 42 is guided by the detent mechanisms 9 to allow eccentric rotation and restrict rotation.

[0064] Furthermore, when the movable scroll 42 moves from Figure 3 The state of (b) is transferred to Figure 4 In the state (a), the rotating body 92 rotates clockwise. Figure 4 In the state (a), the rotating body 92 is arranged at the 6 o'clock position with the pin 91 as the center.

[0065] Furthermore, when the movable scroll 42 moves from Figure 4 The state of (a) is transferred to Figure 4 In the state (b), the rotating body 92 rotates clockwise. Figure 4 In the state (b), the rotating body 92 is arranged at the 9 o'clock position with the pin 91 as the center.

[0066] The movable scroll 42 rotates eccentrically while maintaining the posture, and the rotating body 92 rotates eccentrically around the pin 91. Therefore, when the movable scroll 42 rotates eccentrically, the front end surface 92a of the rotating body 92 slides relative to the bottom surface 42e of the pocket 42d (see Figure 5 ).

[0067] use Figure 5 The relative sliding between the front end surface 92a of the rotating body 92 and the bottom surface 42e of the pocket 42d will be described. Figure 5 Yes Figure 3 FIG. 1 is a diagram showing a rotating body 92 cut along a dynamic pressure generating groove 94 and developed. In order to facilitate the description, the dynamic pressure generating groove 94 is shown to be deeper than it actually is.

[0068] like Figure 5 As shown in the figure, when the front end face 92a of the rotating body 92 slides relative to the bottom face 42e of the pocket hole 42d, the fluid in the dynamic pressure generating groove 94 moves from one end 94a to the other end 94b. As a result, dynamic pressure is generated at the other end 94b, and the front end face 92a and the bottom face 42e are slightly separated, forming a fluid film based on the fluid. In addition, the fluid is supplied to the dynamic pressure generating groove 94 from the one end 94a at any time.

[0069] In addition, the side seal 7 is arranged in a compressed state between the movable scroll 42 and the thrust plate 8. Therefore, even if the movable scroll 42 moves toward the fixed scroll 41 side due to the dynamic pressure of the dynamic pressure generating groove 94, the elastic recovery of the side seal 7 can be used to maintain the sealing state between the movable scroll 42 and the thrust plate 8.

[0070] As described above, the anti-rotation mechanism 9 is formed with the dynamic pressure generating groove 94 capable of generating dynamic pressure on the back side of the movable scroll 42. Thus, by the relative movement of the movable scroll 42 and the thrust plate 8, dynamic pressure is generated in the dynamic pressure generating groove 94, and the movable scroll 42 and the thrust plate 8 can be separated, so that the sliding property between the movable scroll 42 and the thrust plate 8 can be improved.

[0071] Furthermore, the anti-rotation mechanism 9 having the dynamic pressure generating groove 94 is arranged at a position closer to the inner diameter side than the side seal 7 which is the sealing portion between the movable scroll 42 and the thrust plate 8, so that the fluid in the back pressure chamber 50 on the high pressure side will not leak into the low pressure chamber 20 on the low pressure side.

[0072] The anti-rotation mechanism 9 is composed of a pin 91 inserted into a pocket 42d provided in the movable scroll 42, and a rotating body 92 rotatably mounted on the pin 91, and a dynamic pressure generating groove 94 is formed in the rotating body 92. Thus, the rotating body 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.

[0073] The pin 91 is inserted into a recess 93 provided on the back surface of the rotating body 92 , and when dynamic pressure is generated in the dynamic pressure generating groove 94 , the front end surface of the pin 91 can restrict the rotating body 92 from moving toward the back surface.

[0074] Furthermore, the rotor 92 is eccentrically attached to the pin 91 . Thus, the rotor 92 can be smoothly rotated in accordance with the eccentric rotation of the movable scroll 42 .

[0075] Furthermore, since one end 94 a 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 .

[0076] Furthermore, since the dynamic pressure generating groove 94 is in an arc shape, it is possible to efficiently generate dynamic pressure in response to the eccentric rotation of the rotating body 92 .

[0077] The dynamic pressure generating groove 94 is provided on the front end surface 92a of the rotating body 92 so as to face the bottom surface 42e of the pocket 42d. Thus, the bottom surface 42e of the pocket 42d having a large area can receive the dynamic pressure, and thus the dynamic pressure can be stably generated.

[0078] Example 2

[0079] Next, refer to Figure 6 The restricting member of the second embodiment will be described. In addition, the overlapping description of the same structure as the first embodiment will be omitted.

[0080] like Figure 6 As shown, the anti-rotation mechanism 29 of the second embodiment is composed of a pin 291 extending from the thrust plate 28 and a rotating body 292 mounted on the pin 291 so as to be eccentrically rotatable.

[0081] The rotor 292 is formed to have a smaller diameter than the pocket 242d. The movable scroll 242 side of the rotor 292 is inserted into the pocket 242d with play.

[0082] Then, in a state where the pin 291 is inserted into the recessed portion 293, the back surface 292b of the rotating body 292 abuts against the sliding surface 28a of the thrust plate 28. A dynamic pressure generating groove 294 is formed on the back surface 292b.

[0083] When the movable scroll 242 rotates eccentrically, the rotating body 292 also rotates eccentrically relative to the pin 291, and the back surface 292b of the rotating body 292 slides relative to the sliding surface 28a of the thrust plate 28. As a result, dynamic pressure is generated in the dynamic pressure generating groove 294, and the back surface 292b and the sliding surface 28a are slightly separated, forming a fluid film based on the fluid.

[0084] Example 3

[0085] Next, refer to Figure 7 The restricting member of the third embodiment will be described. In addition, the overlapping description of the same structure as the first embodiment will be omitted.

[0086] like Figure 7 As shown, the anti-rotation mechanism 39 of the third embodiment is a pin 391 extending from the thrust plate 38 toward the movable scroll 342. The structure of the rotating body 92, 292 of the first and second embodiments is omitted.

[0087] An arc-shaped dynamic pressure generating groove 394 is provided on the front end surface 391 a of the pin 391 .

[0088] When the rotation axis 2 (refer to Figure 1 ) rotates, the inner circumferential surface of the pocket 342d is guided by the pin 391, thereby the movable scroll 342 rotates eccentrically while maintaining the posture, and the front end surface 391a of the pin 391 slides relatively with the bottom surface 342e of the pocket 342d. As a result, dynamic pressure is generated in the dynamic pressure generating groove 394, and the front end surface 391a and the bottom surface 342e are slightly separated, forming a fluid film based on the fluid.

[0089] As mentioned above, although the embodiment of the present invention is described with reference to the drawings, the specific structure is not limited to these embodiments, and the change and addition within the range which does not deviate from the summary of the present invention are also included in the present invention.

[0090] For example, in the above-mentioned Embodiments 1 to 3, a mode in which a plurality of restricting members are provided is exemplified, but as long as the eccentric rotation of the movable scroll can be allowed and the rotation can be restricted, only at least one restricting member may be provided.

[0091] Furthermore, in the above-mentioned embodiments 1 and 2, the rotating body is exemplified as being in the form of a disc, but any shape may be freely changed as long as it is guided along the inner peripheral surface of the pocket.

[0092] Furthermore, in the above-mentioned first to third embodiments, an example is given in which one dynamic pressure generating groove is provided for one restriction member. However, a plurality of dynamic pressure generating grooves may be provided for one restriction member.

[0093] Furthermore, in the above-mentioned Embodiments 1 to 3, the dynamic pressure generating groove is exemplified as being in an arc shape, but for example, it may be extended linearly in the circumferential direction, and its shape may be freely changed.

[0094] Furthermore, in the above-mentioned Embodiments 1 to 3, an example is given in which one end of the dynamic pressure generating groove communicates with the outer space, but for example, a shape such as a pit that is separated from the outer space may be used.

[0095] Furthermore, in the above-mentioned first to third embodiments, the restricting member is arranged on the inner diameter side of the side seal, that is, the back pressure chamber. However, the restricting member may be arranged on the outer diameter side of the side seal, that is, the low pressure chamber.

[0096] Furthermore, in the above-mentioned Embodiments 1 to 3, the embodiment in which the rotating body is made of metal is exemplified, but the material of the rotating body can be freely selected according to the use environment and the like.

[0097] Furthermore, in the aforementioned embodiments 1 to 3, the method of applying the thrust plate as a thrust bearing mechanism to the scroll compressor C used in the air-conditioning system of an automobile, etc. is described, but it is not limited to this. As long as it is a rotating machine including an eccentric mechanism, for example, it can also be applied to a scroll expansion compressor that has an expander and a compressor in one body.

[0098] Furthermore, in the above-mentioned embodiments 1 to 3, the outer diameter side of the thrust plate is the low pressure side and the inner diameter side is the high pressure side. However, 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.

[0099] Furthermore, the fluids existing in the inner and outer spaces of the sliding surface of the thrust receiving mechanism may be in any state of gas, liquid, or a mixture of gas and liquid.

[0100] Furthermore, in the above-mentioned first to third embodiments, the side seal and the thrust plate are exemplified as sliding relative to each other. However, the back surface of the movable scroll and the thrust plate may directly slide relative to each other.

[0101] Furthermore, in the aforementioned embodiments 1 and 2, the manner in which the rotating body contacts the front end of the pin is illustrated, but the front end of the pin may not contact the rotating body. For example, the recessed portion of the rotating body may not be a bottomed hole but a through hole. When the rotating body is inserted with the pin, the back side of the rotating body abuts against the sliding surface 28a of the thrust plate.

[0102] Furthermore, in the above-mentioned embodiments 1 to 3, the front end surface of the rotating body and the bottom surface of the pocket are in contact when the thrust plate is not working and separated during relative rotation. However, as long as dynamic pressure can be generated by relative rotation, they can also be separated when not working.

[0103] Description of symbols

[0104] 4: scroll compression mechanism; 7: side seal; 8: thrust plate (thrust bearing mechanism); 9: anti-rotation mechanism (limiting component); 20: low pressure chamber; 28: thrust plate; 29: anti-rotation mechanism (limiting component); 30: high pressure chamber; 38: thrust plate; 39: anti-rotation mechanism (limiting component); 41: fixed scroll; 42: movable scroll; 42d: pocket; 42e: bottom surface; 50: back pressure chamber; 91: Pin; 92: rotating body; 92a: front end face; 94: dynamic pressure generating groove; 94a: one end; 94b: the other end; 242: movable scroll; 242d: pocket; 291: pin; 292: rotating body; 294: dynamic pressure generating groove; 342: movable scroll; 342d: pocket; 342e: bottom face; 391: pin; 391a: front end face; 394: dynamic pressure generating groove; C: scroll 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.

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