Cross slip ring assembly and scroll compressor

Abstract

The utility model relates to a cross slip ring assembly and a scroll compressor. According to one aspect of the utility model, the utility model provides a cross-shaped slip ring assembly, the cross-shaped slip ring assembly is used for a scroll compressor, and the cross-shaped slip ring assembly comprises a cross-shaped slip ring body; the key extends from the cross-shaped sliding ring body and is used for being matched with a key groove formed in a key matching part of the scroll compressor, the key comprises a matching part used for being matched with the key groove, the matching part is provided with a working surface serving as a stress side surface, and the stress side surface is provided with a stress side surface. A groove is provided only at the working surface among the working surface of the mating portion and a non-working surface opposite to the working surface. According to the utility model, the abrasion of the working surface of the matching part of the key of the cross slip ring assembly can be reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to scroll compressor field, especially, it relates to cross slip ring for scroll compressor. BACKGROUND

[0002] The content of this section only provides the background information related to the present disclosure, which may not constitute the prior art.

[0003] Scroll compressor is a kind of positive displacement compressor, it has the compression mechanism by dynamic scroll and fixed scroll.The dynamic scroll and fixed scroll mutually cooperate to form scroll compression chamber.In order to limit the movement of dynamic scroll part relative to fixed scroll to the form of orbiting of translation, scroll compressor is provided with the cross slip ring assembly that can effectively prevent the rotation of dynamic scroll.

[0004] Figure 1 The cross slip ring assembly for scroll compressor of prior art is shown.The cross slip ring assembly 100 includes cross slip ring body 110 and the pair of first key 120 and the pair of second key 130 extended from cross slip ring body 110, wherein each first key in first key 120 is used to cooperate with the first key slot arranged in the fixed scroll of scroll compressor, and each second key in second key 130 is used to cooperate with the second key slot arranged in the dynamic scroll of scroll compressor.As shown, Figure 1 When the dynamic scroll of scroll compressor moves relative to fixed scroll, the working surface (i.e. force side surface) of two first keys 120 is subjected to the force F 1a and F 1b of opposite direction respectively, and the working surface (i.e. force side surface) of two second keys 130 is subjected to the force F

[0005] Figure 2a And Figure 2b The schematic diagram of the cooperation of fixed scroll and dynamic scroll of scroll compressor of prior art and the corresponding key of cross slip ring assembly is shown respectively.As shown, Figure 2a The first key 120 of cross slip ring assembly 100 is fitted into the first key slot of fixed scroll 200 of scroll compressor.As shown, Figure 2bAs shown, the second key 130 of the cross slide ring assembly 100 is fitted into the second key groove of the orbiting scroll 300 of the scroll compressor. Since in the scroll compressor, the first key groove of the fixed scroll 200 is positioned above the second key groove of the orbiting scroll 300 in the vertical direction, the height of the first key 120 is greater than the height of the second key 130, so that the first key 120 and the second key 130 can be fitted into the first key groove and the second key groove, respectively. During the operation of the scroll compressor, the first key 120 fitted in the first key groove reciprocates linearly in the radial direction in the first key groove, and the second key 130 fitted in the second key groove reciprocates linearly in the radial direction in the second key groove. During the movement of the first key 120 and the second key 130, their working surfaces are in contact with the side walls of the corresponding key grooves and generate friction, thereby causing the temperature of the contact surface to rise and wear. The contact surface between the first key and the first key groove and the contact surface between the second key and the second key groove cannot be lubricated by active oil supply, but rely on the circulation of a small amount of oil in the refrigerant for lubrication. In particular, for the contact surface between the first key and the first key groove, since the first key groove is a wrap-around design (i.e., the first key groove wraps around the first key), and the vertical position of the first key is high, and there is no active oil supply, it is not possible to ensure that sufficient refrigerant and lubricating oil flow to the contact surface to cool and lubricate it, resulting in insufficient cooling and lubrication, and thus causing more severe wear of the working surface of the first key.

[0006] To solve the above problems, one solution in the prior art is to use a reinforced material with surface hardening treatment as the base material of the cross slide ring assembly. However, although it can provide a certain degree of wear resistance of the keys of the cross slide ring assembly, this solution has the following problem: since the reinforced material contains primary silicon, which is hard but brittle, it is easy to produce debris during friction, thereby further aggravating the wear of the contact surface.

[0007] Therefore, there is a need for an improved cross slide ring assembly that can at least alleviate at least one of the above problems. SUMMARY

[0008] In this section, a general summary of the application is provided, rather than a comprehensive disclosure of the full scope or all features of the application.

[0009] The object of the present application is to solve one or more of the above technical problems. For example, the technical solution of the present application can reduce the wear of the working surface of the fitting part of the key of the cross slide ring assembly that cooperates with the key fitting part of the scroll compressor.

[0010] According to one aspect of the present application, a cross slide ring assembly is provided, the cross slide ring assembly is used for a scroll compressor, and the cross slide ring assembly comprises: a cross slide ring body; and a key extending from the cross slide ring body and used for cooperating with a key groove arranged in a key cooperating component of the scroll compressor, wherein the key comprises a cooperating portion used for cooperating with the key groove, the cooperating portion has a working surface as a force receiving side surface, and a groove is arranged only at the working surface among a working surface and a non-working surface opposite to the working surface of the cooperating portion.

[0011] In the cross slide ring assembly, the groove is arranged at a radially outer portion of the working surface.

[0012] In the cross slide ring assembly, the groove is a vertically extending groove.

[0013] In the cross slide ring assembly, the groove vertically extends from a distal surface of the cooperating portion.

[0014] In the cross slide ring assembly, a projection area of the groove is between 15 mm 2 and 22 mm 2 .

[0015] In the cross slide ring assembly, the groove is configured as follows: in a case where the cooperating portion of the key is fitted into the key groove, a proximal edge of the groove is aligned with a proximal edge of a side wall opposite to the working surface of the key groove, or the proximal edge of the groove is more distal to the cross slide ring body in a vertical direction than the proximal edge of the side wall opposite to the working surface of the key groove, so that the groove is always completely covered by the side wall opposite to the working surface of the key groove during operation of the scroll compressor.

[0016] According to another aspect of the present application, a scroll compressor is also provided, the scroll compressor comprises a key cooperating component and the cross slide ring assembly as described above.

[0017] According to still another aspect of the present application, a scroll compressor is also provided, the scroll compressor comprises: a cross slide ring assembly, the cross slide ring assembly comprises a key, wherein the key comprises a working surface as a force receiving side surface; a key cooperating component, the key cooperating component comprises a key groove used for accommodating the key of the cross slide ring assembly, wherein the key groove comprises a working side wall opposite to the working surface, and a groove is arranged on the working side wall of the key groove.

[0018] In the scroll compressor, the groove is a vertically extending groove.

[0019] In the scroll compressor, the groove vertically extends from a proximal edge of the working side wall.

[0020] In the scroll compressor, the groove is configured as follows: the groove is always completely covered by the working surface during operation of the scroll compressor.

[0021] In the scroll compressor described above, the groove is provided at a radially outer portion of the working side wall of the key groove.

[0022] In the scroll compressor described above, the key fitting member includes the fixed scroll, or the main bearing seat, or the orbiting scroll.

[0023] The advantages of the cross slip ring assembly and the scroll compressor according to the present application are, for example, as follows. The groove is provided on the working surface of the fitting portion of the key of the cross slip ring assembly according to the present application or on the working side wall of the key groove of the key fitting member of the scroll compressor according to the present application, whereby the groove can collect the debris generated due to the friction between the working surface of the fitting portion of the key of the cross slip ring assembly and the side wall of the key groove of the key fitting member during the operation of the scroll compressor, thereby reducing the wear of the working surface of the fitting portion of the key of the cross slip ring assembly, so that the scroll compressor can be reliably operated at a higher temperature, a lower mass flow rate and a worse lubrication condition, thereby greatly expanding the application scenarios and range of the scroll compressor. BRIEF DESCRIPTION OF DRAWINGS

[0024] The following drawings show the technical features of one or more embodiments of the cross slip ring assembly of the scroll compressor according to the present application and the existing scroll compressor, in which:

[0025] Figure 1 is a schematic view of the cross slip ring assembly of the prior art, in which the force direction of each key of the cross slip ring assembly is shown;

[0026] Figure 2a and Figure 2b are schematic views of the cooperation of the fixed scroll and the orbiting scroll of the scroll compressor of the prior art with the corresponding keys of the cross slip ring assembly, respectively;

[0027] Figure 3 is a schematic view of the cross slip ring assembly according to the first embodiment of the present application;

[0028] Figure 4a and Figure 4b are a right view and a top view of a first key of the cross slip ring assembly according to the first embodiment of the present application, in which the groove provided on the working surface of the fitting portion of the first key is shown;

[0029] Figure 5 is a schematic view of the cooperation of the fitting portion of a first key of the cross slip ring assembly according to the first embodiment of the present application with a first key groove of the fixed scroll;

[0030] Figure 6 is a perspective view of the fixed scroll of the scroll compressor according to the second embodiment of the present application;

[0031] Figure 7 This is an enlarged view of a keyway of a scroll compressor according to a second embodiment of the present invention, wherein a groove provided on the working side wall of the keyway is shown. Detailed Implementation

[0032] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. This detailed description is for illustrative purposes only and is not intended to limit the invention or its applications or uses.

[0033] The first embodiment of this utility model provides a cross slip ring assembly for a scroll compressor, the cross slip ring assembly having a groove provided on the working surface of the mating part of the first key to reduce wear on the working surface.

[0034] First, refer to Figures 3-5 The overall structure and working principle of the cross slip ring assembly according to the first embodiment of the present invention are briefly described.

[0035] Figure 3 A cross-slip ring assembly according to a first embodiment of the present invention is shown, which is used in a scroll compressor. Figure 3 As shown, the cross-ring assembly 10 includes a cross-ring body 11 and a key, which includes a first key and a second key, such as a pair of first keys 12 and 13 and a pair of second keys 14 and 15. The key of the cross-ring assembly 10 is used to mate with a key-fitting component of a scroll compressor. For example, a pair of first keys 12 and 13 extend from the cross-ring body 11 and are used to mate with a first keyway provided in the stationary scroll of the scroll compressor, and a pair of second keys 14 and 15 extend from the cross-ring body 11 and are used to mate with a second keyway provided in the moving scroll of the scroll compressor. The line connecting the pair of first keys 12 and 13 and the line connecting the pair of second keys 14 and 15 may be substantially perpendicular. Although in this embodiment, the key-fitting component is exemplified as a stationary scroll and a moving scroll, the key-fitting component may also be a main bearing housing and the main bearing housing may include a keyway for receiving at least one first key. The first key 12 includes a base 123 connected to the cross-ring body 11 and a mating portion 124 extending from the base (in Figure 4a (As shown in the diagram), the mating part 124 is used to assemble into and is surrounded by the first keyway. The mating part 124 of the first key 12 has two opposing side surfaces facing the sidewall of the first keyway, one of which is a force-bearing side surface that bears a large force during the operation of the scroll compressor, and therefore serves as the working surface of the first key. During the operation of the scroll compressor, the moving scroll will rotate relative to the stationary scroll in a translational manner, for example, for the first key 12. Figure 3The right side of key 12 is the working surface 121 (in Figure 4a (as shown in the image), and for the first key 13, Figure 3 The left side of key 13 is the working surface. At least one working surface of the first key has a groove 16, which can accommodate debris generated during friction, thereby reducing wear on the working surface. It should be noted that the groove is only provided on the working surface 121 of the mating portion 124 of the first key 12, and not on the non-working surface. Compared to a design where grooves are provided on both the working and non-working surfaces of the mating portion of the first key, this design ensures greater strength of the keys in the cross-ring assembly and simplifies manufacturing. Preferably, a groove is provided on the working surface of each first key. In this embodiment, a groove 16 is provided on the working surface 121 of the mating portion 124 of the first key 12, and the specific structure of the groove 16 will be referred to below. Figure 4a and Figure 4b Detailed Description. Although a groove is provided on the working surface of the mating portion of the first key in this embodiment, a groove with the same or similar configuration may also be provided on the working surface of the mating portion of the second key to reduce wear on the working surface of the second key. Furthermore, preferably, the first key (or the mating portion of the first key) of the cross slip ring assembly according to the first embodiment of this utility model includes a base material portion of B390 alloy and a hard oxide layer covering the outer surface of the base material portion to further enhance its wear resistance.

[0036] Figure 4a This is a right view of a first key of a cross-slip ring assembly according to a first embodiment of the present invention, i.e., from... Figure 3 The view when viewing the first key from the right side. Figure 4b These are top views of a first key of the cross-shaped slip ring assembly according to the first embodiment of the present invention, that is, from... Figure 3 The view when viewing the first key from above. Figure 4a and Figure 4b In both cases, a groove is shown on the working surface of the mating part of the first key. For example... Figure 4a As shown, a groove 16 is provided on the working surface 121 of the mating portion 124 of the first key 12. This groove 16 can be located on the radially outer portion of the working surface 121 (i.e., the portion outside the centerline C of the working surface 121). Figure 4athe working surface 121 of the fitting portion 124 of the first key 12, and can be provided at only the radially outer portion of the working surface 121. The reason for this design is that the radially outer portion of the working surface 121 of the fitting portion 124 of the first key 12 is subjected to greater local stress caused by friction during operation of the scroll compressor, and is prone to wear and tear and the generation of debris. The provision of the groove 16 at the radially outer portion of the working surface 121 is advantageous for collecting debris and mitigating or even preventing further wear of the working surface. Preferably, the groove 16 can be configured as a vertically extending groove, and extends vertically downward from the top surface 122 (i.e. the distal surface, which is located at the side of the fitting portion distal to the slip ring body in the vertical direction) of the fitting portion 124 of the first key 12. Optionally, the groove 16 is configured such that, in the case where the fitting portion 124 of the first key 12 is fitted into the first key slot, the lower edge (i.e. the proximal edge, which is the edge of the groove proximal to the slip ring body in the vertical direction) of the groove 16 is aligned with the lower edge (i.e. the proximal edge, which is the edge of the side wall proximal to the slip ring body in the vertical direction) of the side wall of the first key slot opposite to the working surface, so as to enlarge the area of the opening of the groove, so as to more effectively collect debris; or, in the case where the fitting portion 124 of the first key 12 is fitted into the first key slot, the groove 16 extends to a distance from the lower edge of the side wall of the first key slot opposite to the working surface, so that the lower edge of the groove is more distal to the slip ring body in the vertical direction than the lower edge of the side wall of the first key slot opposite to the working surface, so as to more reliably trap debris in the groove, and ensure that the debris does not escape from the groove. Referring to Figure 4b FIG. 11, which shows the groove 16 at another angle, shows that the groove 16 is provided at the radially outer portion of the working surface 121 of the fitting portion 124 of the first key 12, and extends from the top surface 122 of the fitting portion 124 of the first key 12. Preferably, the bottom surface of the groove 16 is arc-shaped in cross-section in this view. Preferably, the projected area of the groove 16 can be between 15 mm 2 and 22 mm 2 . Here, the projected area of the groove 16 is defined as the area of the bottom surface of the groove, i.e. the product of the longitudinal length of the groove and the arc length in the cross-section of the groove.

[0037] Figure 5 is a schematic view of the cooperation of the fitting portion of a first key of a cross slip ring assembly according to the first embodiment of the present application with a first key slot of a stationary scroll, wherein the observation direction is from the front of the first key, i.e. the view when the first key is observed from the lower side of Figure 3 . As Figure 5As shown, in the assembled state of the scroll compressor, a mating portion 124 of one of the first keys 12 of the cross slide ring assembly according to the first embodiment of the present application is fitted into a first key groove 17 of the fixed scroll of the scroll compressor in a slidable manner. Preferably, a groove 16 (shown in dashed lines in Figure 5 the middle) provided on a working surface 121 of the mating portion 124 of the first key 12 is configured such that, during operation of the scroll compressor, the groove 16 is always completely covered by a side wall of the first key groove opposite the working surface 121. In this way, debris collected in the groove can be trapped in the groove, so that it does not adversely affect the operation of the scroll compressor.

[0038] The working principle of the cross slide ring assembly according to the first embodiment of the present application and the advantageous technical effects obtained thereby will be described below.

[0039] In the assembled state of the scroll compressor including the cross-slip ring assembly according to the first embodiment of the present invention, the mating part of the first key of the cross-slip ring assembly is fitted into the first keyway of the stationary scroll of the scroll compressor. During the operation of the scroll compressor, the moving scroll rotates relative to the stationary scroll in a translational manner, and the mating part of the first key slides in the first keyway to prevent the moving scroll from rotating. The sliding of the mating part of the first key in the first keyway is a reciprocating linear motion in the radial direction, and due to the large relative force between the mating part of the first key and the first keyway, a large friction is generated between the working surface (i.e., the force-bearing side surface) of the mating part of the first key and the sidewall of the opposite first keyway. During this friction process, a large concentrated stress is formed at the radially outer portion of the working surface of the mating part of the first key, which easily causes wear and debris to be generated at the radially outer portion of the working surface of the mating part of the first key. If these debris cannot be removed, the wear surface and wear depth will continue to expand, thereby aggravating the wear of the entire friction surface. In the cross-shaped slip ring assembly according to the first embodiment of this utility model, since a groove is provided on the radially outer portion of the working surface of the mating part of the first key, wear-related debris can be easily collected and sealed in the groove, thereby preventing these debris from continuing to slide between the mating part of the first key and the contact surface of the first key groove to form high stress, thus avoiding greater wear. During the sliding of the mating part of the first key in the first key groove, the groove sweeps across the sidewall of the opposite first key groove (i.e., moves in the radial direction) as the mating part slides, thereby collecting debris essentially across the entire friction surface, preventing localized high stress formation, and allowing the friction surface to quickly form a low-stress distribution contact through running-in, further reducing wear on the working surface of the mating part of the first key. Furthermore, the movement of the groove can enhance the cooling and lubrication effect of the friction surface, thereby systematically enhancing the wear resistance of the working surface of the mating part of the first key in the cross-shaped slip ring. Therefore, the cross slip ring assembly according to the first embodiment of this utility model, through simple structural optimization, enables the scroll compressor including the cross slip ring assembly to operate reliably under higher temperatures, lower mass flow rates and worse lubrication conditions, thereby greatly expanding the application scenarios and scope of the scroll compressor.

[0040] The second embodiment of this utility model provides a scroll compressor, wherein a groove is provided on the working side wall of the keyway of the fixed scroll of the scroll compressor to reduce the wear of the working surface of the first key of the cross slip ring assembly of the scroll compressor.

[0041] The following will refer to Figure 6 and Figure 7 The overall structure and working principle of the scroll compressor according to the second embodiment of the present invention are briefly described.

[0042] Figure 6 is a perspective view of a fixed scroll of a scroll compressor according to the second embodiment of the present utility model. Figure 7 is an enlarged view of a key groove of the fixed scroll of the scroll compressor according to the second embodiment of the present utility model, wherein a groove provided on a working side wall of the key groove is shown.

[0043] The scroll compressor according to the second embodiment of the present utility model comprises a compression mechanism composed of a fixed scroll 20 and a moving scroll (not shown). During operation of the scroll compressor, the moving scroll orbits relative to the fixed scroll in a translational manner to form a compression chamber. The scroll compressor further comprises a cross slide ring assembly (not shown), and the cross slide ring assembly is substantially identical to the cross slide ring assembly according to the first embodiment of the present utility model, except that the keys of the cross slide ring assembly for cooperating with the key grooves in the key mating components do not necessarily have grooves provided thereon. The key mating components can comprise the fixed scroll, or the moving scroll, or the main bearing seat. In this embodiment, the configuration of the key groove of the fixed scroll as the key mating component and the cooperation of the key groove with the corresponding keys of the cross slide ring assembly will be described in detail. The cross slide ring assembly comprises first keys, for example, a pair of first keys, for cooperating with a first key groove provided in the fixed scroll 20 of the scroll compressor. The fixed scroll 20 of the scroll compressor comprises a pair of first key grooves 21 for accommodating the pair of first keys of the cross slide ring assembly. Each first key groove 21 has two side walls opposite to each other, wherein one side wall faces a working surface of the first key, thus serving as a working side wall of the first key groove 21. At least one working side wall 22 of the first key groove 21 is provided with a groove 23 for accommodating debris generated in the friction process between the working side wall 22 and the working surface of the first key of the cross slide ring assembly, thereby reducing the wear of the working surface. As shown in Figure 7 Preferably, the groove 23 can be provided at a radially outer portion of the working side wall 22, i.e., an outer portion of the center line C1 of the working side wall 22, Figure 7The recess 23 is preferably configured as a vertically extending recess and extends vertically upward from a lower edge (i.e. a proximal edge, which is the edge of the working side wall closer to the cross-slip ring body in the vertical direction) of the working side wall 22 of the first keyway 21. The recess 23 provided on the working side wall 22 of the first keyway 21 is preferably configured such that the recess 23 is always completely covered by the working surface of the first key during the operation of the scroll compressor. In this way, the debris collected into the recess can be sealed in the recess, so as not to adversely affect the operation of the scroll compressor. Although in this embodiment the configuration of the keyway of the fixed scroll and the cooperation of the keyway with the corresponding key of the cross-slip ring assembly are described in detail, a keyway with the same or similar configuration can also be provided in the main bearing seat and / or the orbiting scroll for cooperation with the corresponding key of the cross-slip ring assembly, and the effect of reducing the wear of the working surface of the corresponding key.

[0044] The working principle of the scroll compressor according to the second embodiment of the present application and the obtained advantageous technical effects will be described below.

[0045] In the assembled state of the scroll compressor according to the second embodiment of the present application, the first key of the cross slide ring assembly of the scroll compressor is fitted into the first key groove of the fixed scroll of the scroll compressor. In the working process of the scroll compressor, the orbiting scroll orbits relative to the fixed scroll in a translational manner, and the first key slides in the first key groove to prevent the orbiting scroll from rotating. The sliding of the first key in the first key groove is a reciprocating linear motion in the radial direction, and due to the relatively large force between the first key and the first key groove, friction occurs between the working surface (i.e. the force side surface) of the first key and the working side wall of the opposite first key groove. During this friction process, a relatively large concentrated stress is formed at the radially outer portion of the working surface of the first key, so that the radially outer portion of the working surface of the first key is prone to wear and produce debris, and if these debris cannot be removed, it will cause the wear surface and wear depth to continuously expand, thereby exacerbating the wear of the entire friction surface. In the scroll compressor according to the second embodiment of the present application, since the radially outer portion of the working side wall of the first key groove is provided with a groove, the debris generated due to wear can be relatively easily collected in the groove and sealed in the groove, thereby avoiding these debris to continue to slide between the contact surface of the first key and the first key groove to form high stress, thereby avoiding greater wear. In addition, the provision of the groove can also enhance the cooling and lubrication effect of the friction surface, thereby systematically enhancing the wear resistance of the working surface of the first key of the cross slide ring. Thus, the scroll compressor according to the second embodiment of the present application can reliably operate at higher temperatures, lower mass flow rates and worse lubrication conditions through simple structural optimization, thereby greatly expanding the application scenarios and range of the scroll compressor.

[0046] In addition, it should be noted that although the cross slide ring assembly according to the first embodiment of the present application and the scroll compressor according to the second embodiment of the present application are described in the foregoing embodiments, it can be understood that the technical solutions in the above embodiments are only illustrative and not limiting, and various modifications can be made, for example, as follows.

[0047] The first key of the cross slip ring assembly according to the first embodiment does not necessarily have to employ the B390 alloy as the base material portion and does not necessarily have to include the hard outer surface oxide layer covering the base material portion, but other material with less wear resistance can also be employed as the base material portion of the first key of the cross slip ring assembly, and the hard outer surface oxide layer covering the base material portion can also be omitted. The recesses on the working surface of the mating portion of the first key of the cross slip ring assembly according to the first embodiment and the recesses on the working side wall of the first key slot of the fixed scroll of the scroll compressor according to the second embodiment do not necessarily have to be vertically extending recesses, but can have other orientations, such as obliquely extending recesses. The recesses on the working surface of the mating portion of the first key of the cross slip ring assembly according to the first embodiment do not necessarily have to be completely covered by the side wall of the opposite first key slot at all times during the operation of the scroll compressor, but can be only partially covered. The recesses on the working side wall of the first key slot of the fixed scroll of the scroll compressor according to the second embodiment do not necessarily have to be provided at the radially outer portion of the working side wall, but can be provided at other locations of the working side wall. The recesses on the working side wall of the first key slot of the fixed scroll of the scroll compressor according to the second embodiment do not necessarily have to extend from the lower edge of the working side wall, but can be at a distance from the lower edge of the working side wall. The recesses on the working side wall of the first key slot of the fixed scroll of the scroll compressor according to the second embodiment do not necessarily have to be completely covered by the working surface of the opposite first key at all times during the operation of the scroll compressor, but can be only partially covered.

[0048] While the present application has been described with reference to example embodiments, it will be understood by those skilled in the art that various changes can be made and equivalents can be substituted for elements thereof without departing from the scope of the application. In addition, many modifications can be made to adapt a particular situation or material to the teachings of the application without departing from the central inventive concept disclosed herein.

Claims

1. A slip ring assembly for a scroll compressor, the slip ring assembly comprising: a slip ring body; and a key extending from the slip ring body and configured to cooperate with a keyway provided in a key cooperating member of the scroll compressor, wherein the key comprises a cooperating portion for cooperating with the keyway, the cooperating portion having a working surface as a force receiving side surface, characterized in that a groove is provided only at the working surface among the working surface and a non-working surface opposite to the working surface of the cooperating portion. The groove is provided at a radially outer portion of the working surface.

2. The slip ring assembly of claim 1, wherein, The groove is a vertically extending groove.

3. A slip ring assembly according to claim 1 or 2, wherein, The groove extends vertically from a distal surface of the cooperating portion.

4. The slip ring assembly of claim 3, wherein, The groove is configured such that, in a case where the cooperating portion of the key is fitted into the keyway, a proximal edge of the groove is aligned with a proximal edge of a side wall of the keyway opposite to the working surface, or 5. The slip ring assembly of claim 4, wherein, The projected area of the recess is between 15 mm 2 and 22 mm 2 between 15 mm and 22 mm.

6. The slip ring assembly of claim 3, wherein, a proximal edge of the groove is more distanced from the slip ring body in a vertical direction than a proximal edge of a side wall of the keyway opposite to the working surface, so that the groove is always completely covered by the side wall of the keyway opposite to the working surface during operation of the scroll compressor. The scroll compressor comprises a key cooperating member and the slip ring assembly according to any one of claims 1 to 6.

7. A scroll compressor characterized by, 8. A scroll compressor, the scroll compressor comprising: a slip ring assembly comprising a key, wherein the key comprises a working surface as a force receiving side surface; a key cooperating member comprising a keyway for accommodating the key of the slip ring assembly, wherein the keyway comprises a working side wall opposite to the working surface, characterized in that a groove is provided on the working side wall of the keyway. The groove is a vertically extending groove.

9. The scroll compressor of claim 8, wherein, The groove extends vertically from a proximal edge of the working side wall.

10. The scroll compressor of claim 9, wherein, The groove is configured such that, during operation of the scroll compressor, the groove is always completely covered by the working surface.

11. The scroll compressor of claim 10, wherein, The groove is provided at a radially outer portion of the working side wall of the keyway.

12. The scroll compressor of any one of claims 8 to 11, wherein, The key cooperating member comprises a fixed scroll, or a main bearing housing, or a movable scroll.

13. The scroll compressor of any one of claims 7 to 11, wherein, ​

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