Inter-rotating scroll compressor with synchronization mechanism

Abstract

The compressor comprises a shell, a first compression member, a bearing housing, and a second compression member. The first compression member is rotatable about the shell around a first axis. The bearing housing is coupled to the first compression member and is rotatable about the shell around a first axis. The bearing housing includes a first pin extending therefrom. The second compression member is rotatable about the shell around a second axis. The second compression member includes a base plate and an arched first pin pocket. The first pin pocket is formed in the base plate to receive the first pin. The first compression member is movable between a first position in which the first pin is engaged with the surface of the first pin pocket and a second position in which the first pin is separated from the surface of the first pin pocket.

Description

Technology Field The present disclosure relates to an inter-rotating scroll compressor having a synchronization mechanism. <Cross-reference to related applications> This application claims priority to U.S. Patent Application No. 17 / 519,721, filed November 5, 2021. The entire disclosure of said application is incorporated into this application by reference. Background Technology This section provides background information related to the present disclosure and is not necessarily prior art. A temperature control system (e.g., a heat pump system, an air conditioning system, a refrigeration system, etc.) comprises a fluid circuit having an outdoor heat exchanger, an indoor heat exchanger, an expansion device positioned between the outdoor heat exchanger and the indoor heat exchanger, and a compressor that circulates a working fluid between the indoor heat exchanger and the outdoor heat exchanger. In order for a temperature control system equipped with a compressor to effectively and efficiently provide cooling and / or heating effects as needed, efficient and stable operation of the compressor is desirable. means of solving the problem This section provides an overall overview of the present disclosure and is not an comprehensive disclosure of the full scope or all features. In one embodiment, the present disclosure discloses a compressor comprising a shell assembly, a first compression member, a bearing housing, and a second compression member. The first compression member is rotatable about the shell assembly about a first axis. The bearing housing is coupled to the first compression member and is rotatable about the shell assembly about the first axis. The bearing housing includes a first pin extending from itself. The second compression member is rotatable about the shell assembly about a second axis spaced apart from the first axis (i.e., the first axis and the second axis are not collinear). The second compression member cooperates with the first compression member to define fluid pockets. The second compression member includes a base plate and a first pin pocket. The first pin pocket is formed in the base plate to receive the first pin. The first compression member is movable between a first position where the first pin is engaged with the surface of the first pin pocket and a second position where the first pin is separated from the surface of the first pin pocket. In a part of the compressor described in the above paragraph, the first fin pocket is arched, and the surface of the first fin pocket is an operating surface having a first arc center. The first fin pocket further includes a non-operating surface having a second arc center spaced apart from the first arc center. In some configurations of the compressor of any one or more of the above paragraphs, the operating surface is extended at an angle of at least 60 degrees. In some configurations of the compressor of any one or more of the paragraphs above, the operating surface has a predetermined angle. The predetermined angle is defined as 360 degrees / number of pins. In a part of the compressor of any one or more of the above paragraphs, when the first compression member is in the second position, the first pin is separated from the operating surface and the non-operating surface. In a part of the compressor of any one or more of the above paragraphs, the first pin pocket further comprises a transition surface disposed between the operating surface and the non-operating surface. The first compression member is movable to a third position in which the first pin is movably engaged with the transition surface. In a part of the compressor of any one or more of the above paragraphs, the bearing housing includes a second pin, and the second compression member includes an arched second pin pocket formed in the base plate. The second pin extends through the second pin pocket and is separated from the surface of the second pin pocket when the first compression member is in the first position. In a part of the compressor of any one or more of the above paragraphs, the second pin is adjacent to the first pin. In a part of the compressor of any one or more of the above paragraphs, the bearing housing includes a second pin, and the second compression member includes an arched second pin pocket formed in the base plate. The second pin extends through the second pin pocket. In a part of the compressor of any one or more of the paragraphs above, the second pin pocket comprises a second operating surface, a second non-operating surface, and a transition surface disposed between the second operating surface and the second non-operating surface. The second pin engages with the transition surface when the first compression member is in the first position. The second operating surface has a third arc center and extends over an angle of at least 60 degrees. In a part of the compressor of any one or more of the above paragraphs, the second pin is adjacent to the first pin. In a part of the compressor of any one or more of the above paragraphs, a drive shaft is coupled to the first compression member, and the drive shaft includes a first housing and a second housing that each receive a first and second pin to connect the first compression member and a bearing. In a part of the compressor of any one or more of the above paragraphs, the first pin is cylindrical in shape. In a part of the compressor of any one or more of the above paragraphs, the first fin pocket is formed on the outer diameter surface of the base plate and extends through the base plate. In a part of the compressor of any one or more of the above paragraphs, the first pin extends axially from the bearing housing (e.g., in a direction parallel to the first axis and the second axis). In a part configuration of the compressor of any one or more of the above paragraphs, the drive shaft is coupled to the first compression member, and the drive shaft includes a first housing that receives the first pin and combines the first compression member and the bearing housing. In another embodiment, the compressor of the present disclosure discloses a shell assembly, a first compression member, a bearing housing, and a second compression member. The first compression member is rotatable about the shell assembly about a first axis. The bearing housing is coupled to the first compression member and is rotatable about the shell assembly about the first axis. The bearing housing includes a plurality of pins extending from itself. The second compression member is rotatable about the shell assembly about a second axis spaced apart from the first axis (i.e., the first axis and the second axis are not collinear). The second compression member cooperates with the first compression member to define fluid pockets. The second compression member includes a base plate and pin pockets formed in the base plate and receiving corresponding pins. Each pin pocket has an operating surface. The first compression member is movable between a first position in which only one of the plurality of pins engages with the operating surface of the corresponding pin pocket and a second position in which the one of the plurality of pins is separated from the operating surface of the corresponding pin pocket. In a part of the compressor described in the above paragraph, the operating surface of each pin pocket has a first arc center, and the non-operating surface of each pin pocket has a second arc center. The second arc center is spaced apart from the first arc center. In a part of the compressor of any one or more of the above paragraphs, each pin pocket has a transition surface disposed between the operating surface and the non-operating surface. Only one of the plurality of pins is movably engaged with the transition surface of the corresponding pin pocket when the first compression member is in the first position. In some configurations of the compressor of any one or more of the above paragraphs, the operating surface is extended at an angle of at least 60 degrees. In some configurations of the compressor of any one or more of the paragraphs above, the operating surface has a predetermined angle. The predetermined angle is defined as 360 degrees / number of pins. In a part of the compressor of any one or more of the paragraphs above, the fin pockets are arranged circumferentially and spaced around the base plate, and the fins are arranged circumferentially and spaced around the axial end surface of the bearing housing. The fin pockets are arched. In a part of the compressor of any one or more of the above paragraphs, the pin pockets are formed on the outer diameter surface of the base plate and extend through the base plate. In another embodiment, the compressor of the present disclosure discloses a shell assembly, a first compression member, a second compression member, and a pin. The first compression member is rotatable about the shell assembly about a first axis. The second compression member is rotatable about the shell assembly about a second axis spaced apart from the first axis. The second compression member cooperates with the first compression member to define fluid pockets. The second compression member includes a base plate and an arched pin pocket. The pin pocket is formed in the base plate. The pin is coupled to the first compression member and received in the pin pocket. The first compression member is movable between a first position in which the pin is engaged with the surface of the pin pocket and a second position in which the pin is separated from the surface of the pin pocket. In a part of the compressor described in the above paragraph, the surface of the fin pocket is an operating surface having a first arc center. The fin pocket further includes a non-operating surface having a second arc center spaced apart from the first arc center. In some configurations of the compressor of any one or more of the above paragraphs, the operating surface is extended at an angle of at least 60 degrees. In a part of the compressor of any one or more of the above paragraphs, the pin is separated from the operating surface and the non-operating surface when the first compression member is in the second position. In a part of the compressor of any one or more of the above paragraphs, the pin pocket further comprises a transition surface disposed between the operating surface and the non-operating surface. The first compression member is movable to a third position where the pin engages with the transition surface. In a part of the compressor of any one or more of the above paragraphs, the bearing housing is coupled to the first compression member through the pin and is rotatable about the shell assembly about the first axis. Additional areas of applicability of the present disclosure will become apparent from the description provided in this specification. The contents and specific examples disclosed in this section are for illustrative purposes only and are not intended to limit the scope of the present disclosure. Brief explanation of the drawing The drawings described herein are merely for illustrating selected embodiments and are not all possible implementations and are not intended to limit the scope of the disclosure. FIG. 1 is a cross-sectional view of a compressor according to the principles of the present disclosure. Figure 2 is a partial cross-sectional view of the compressor of Figure 1. Figure 3 is an exploded view of the compression mechanism and bearing housing of the compressor of Figure 1. Figure 4 is a cross-sectional view of the compressor taken along line 4-4 of Figure 1. And Figure 5 is an enlarged view of the compressor part indicated as area 5 in Figure 4. The corresponding reference number indicates the corresponding part across multiple drawings. Specific details for implementing the invention Exemplary embodiments will be described more fully with reference to the accompanying drawings. Exemplary embodiments are provided to complete the disclosure and fully convey its scope to those skilled in the art. Many specific details are given as examples of specific components, devices, and methods to provide a complete understanding of the embodiments of the disclosure. Those skilled in the art will clearly understand that specific details are not required to be adopted, that exemplary embodiments may be implemented in many different forms, and that neither is to be construed as limiting the scope of the disclosure. In some exemplary embodiments, known processes, known device structures, and known technologies are not described in detail. The terms used in this application specification are intended solely for the purpose of describing specific exemplary embodiments and are not intended to be limiting. As used in this application specification, the singular form is intended to likewise include the plural form unless the context clearly indicates otherwise. The terms “include,” “comprising,” “having,” and “having” are in a comprehensive sense and indicate that the mentioned features, integers, steps, operations, elements, and / or parts are present, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, parts, and / or groups thereof. The steps, processes, and operations described in this application specification are not to be interpreted as necessarily needing to be performed in the specific order discussed or illustrated unless the order of execution is specifically identified. It is also clear that additional or alternative steps may be adopted. Where one element or layer is referred to as being "on," "engaged," "connected," or "combined" with another element or layer, it may be directly on, engaged with, connected to, or combined with the other element or layer, or an intermediate element or layer may exist. Conversely, where one element is referred to as being "directly on," "directly engaged," "directly connected," or "directly combined" with another element or layer, there may be no intermediate element or layer. Other words used to describe the relationship between elements should be interpreted in a similar manner (e.g., "between" vs. "directly between," "adjacently" vs. "directly adjacently," etc.). As used in this application specification, the term "and / or" includes any combination of one or more of the items enumerated in relation thereto and all such combinations. In this application specification, terms such as first, second, third, etc., may be used to describe various elements, components, regions, layers, and / or sections, but such elements, components, regions, layers, and / or sections should not be limited by such terms. Such terms may be used solely to distinguish one element, component, region, layer, or section from another element, component, region, layer, or section. Terms such as "first," "second," and other numbered terms do not imply a sequence or order unless explicitly indicated by the context. Therefore, the first element, first component, first region, first layer, or first section discussed below may refer to the second element, second component, second region, second layer, or second section without departing from the teachings of the exemplary embodiments. Spatial terms such as “inside,” “outside,” “below,” “below,” “lower,” “above,” and “top” may be used in this application specification to facilitate the description of the relationship that one element or feature has with respect to other element(s) or feature(s) depicted in the drawings. Spatial terms may be intended to include other orientations of the device during use or operation in addition to the orientation shown in the drawings. For example, if the device is inverted in the drawings, an element described as “below” or “below” of another element or feature becomes the “above” of that other element or feature. Therefore, the exemplary term “below” may include both the lower and upper directions. The device may be oriented in other ways (rotated 90 degrees or in other directions), and spatial descriptions used in this application specification may be interpreted accordingly. Referring to FIG. 1, a compressor (10) is provided, and the compressor (10) may include a hermetic shell assembly (12), a bearing housing assembly (14), a motor assembly (16) and a compression mechanism (18). The shell assembly (12) may generally form a compressor housing and may include a cylindrical shell (22), a first end cap (24) at one end of the shell (22), a partition (25), and a second end cap (26) at the other end of the shell (22). The shell (22) and the first end cap (24) work together to define (form) a suction-pressure chamber (30). A suction gas inlet fitting (32) may be attached to the shell assembly (12) at the opening of the first end cap (24). A suction pressure working fluid (i.e., a low-pressure working fluid) may be drawn into the compression mechanism (18) through the suction gas inlet fitting (32) for compression. As illustrated in FIGS. 1 and 2, the partition (25) and the second end cap (26) can work together to define the discharge-pressure chamber (33). The partition (25) can separate the intake pressure chamber (30) from the discharge pressure chamber (33). A discharge gas outlet fitting (34) can be attached to the shell assembly (12) at another opening of the second end cap (26) and can communicate with the discharge pressure chamber (33). The discharge pressure working fluid (i.e., a working fluid at a pressure higher than the intake pressure) can be discharged by the compression mechanism (18) and flow into the discharge pressure chamber (33). The discharge pressure working fluid within the discharge pressure chamber (33) can be discharged from the compressor (10) through the discharge gas outlet fitting (34). In some configurations, a discharge valve (e.g., a check valve) may be positioned within or adjacent to the discharge gas outlet fitting (34), allowing fluid to exit the discharge pressure chamber (33) through the discharge gas outlet fitting (34) and preventing it from entering the discharge pressure chamber (33) through the discharge gas outlet fitting (34). A bearing housing assembly (14) may be placed within a suction pressure chamber (30) and may include a main bearing housing (38) and a bearing (40). The main bearing housing (38) may accommodate a bearing (40) inside. The bearing (40) may be a rolling element bearing or any other suitable type of bearing. As illustrated in FIGS. 4 and 5, the main bearing housing (38) may include a plurality of cylindrical pins (41) extending axially from its axial end surface (42). The pins (41) may be spaced apart from each other and may be arranged circumferentially along the axial end surface (42) of the main bearing housing (38). Each pin (41) may have a proximal end (43) and a distal end (44). The proximal end (43) may extend from the axial end surface (42) of the main bearing housing (38). The distal end (44) may be coupled to the drive shaft (46) so that the main bearing housing (38) is coupled to the drive shaft (46). In some configurations, the pins (41) may be separate parts attached to the axial end surface (42) of the main bearing housing (38) via a thread or press-fit, instead of being formed integrally with the axial end surface (42) of the main bearing housing (38). The motor assembly (16) may be placed within the suction pressure chamber (30) and may include a motor stator (52) and a rotor (54). The motor stator (52) may be attached to the shell (22) (e.g., by press fitting, staking, and / or welding). The rotor (54) may be attached to the drive shaft (46) (e.g., by press fitting, staking, and / or welding). The drive shaft (46) may be driven by the rotor (54) and supported by a bearing (59) for relative rotation with respect to the shell assembly (12). The bearing (59) may be secured to the first end cap (24) of the shell assembly (12). In some configurations, the motor assembly (16) is a variable speed motor. In other configurations, the motor assembly (16) may be a multi-speed motor or a fixed speed motor. The drive shaft (46) may include a drive shaft section (56) and a hub section (58). The drive shaft section (56) may include a suction passage (62). The suction passage (62) provides fluid communication between the suction gas inlet fitting (32) and the compression mechanism (18). The inlet (65) of the suction passage (62) may be located at or near the first end (67) of the drive shaft section (56) adjacent to the suction gas inlet fitting (32). The outlet (66) of the suction passage (62) may be located at or near the second end (69) of the suction passage (62) of the drive shaft section (56) adjacent to the compression mechanism (18). The hub section (58) may extend from the second end (69) of the drive shaft section (56) and may include a first part (70), a second part (72), and a flange (74). The first part (70) extends radially from the second end (69) (in a direction perpendicular to the axis of rotation (A1) of the drive shaft (46). The second part (72) extends axially from the periphery of the first part (70) (in a direction parallel to the axis of rotation (A1) of the drive shaft (46). The flange (74) extends radially from the end of the second part (72) and includes a plurality of pin housings (75). As shown in FIG. 3, the pin housings (75) are spaced apart from each other and arranged circumferentially around the flange (74). Each pin (41) extending from the main bearing housing (38) is received in a corresponding pin housing (75) to connect the main bearing housing (38) and the drive shaft (46) to each other. In this way, the rotation of the drive shaft (46) causes a corresponding rotation of the main bearing housing (38) around the rotation axis (A1) of the drive shaft (46). The compression mechanism (18) may be placed within the suction pressure chamber (30). The compression mechanism (18) may include a first compression member and a second compression member, which cooperate (together) to define fluid pockets (i.e., compression pockets) between them. For example, the compression mechanism (18) may be a co-rotating scroll compression mechanism in which the first compression member is a first scroll member (i.e., a driving scroll member) (76) and the second compression member is a second scroll member (i.e., a driven scroll member) (78). The first scroll member (76) may include a first end plate (80) and a first spiral wrap (82) extending from the first end plate (80). The first end plate (80) is positioned and fixed within the hub section (58) of the drive shaft (46) so that the hub section (58) surrounds the first spiral wrap (82). In some configurations, the first scroll member (76) and the drive shaft (46) may be a single part rather than two separate parts fixed to each other. The first end plate (80) may include a radially extending passage (84a) and an axially extending passage (84b). The radially extending passage (84a) is formed in the first end plate (80) and extends from the central region of the first end plate (80) to the axially extending passage (84b). The axial extension passage (84b) extends from the end of the radial extension passage (84a) to the suction inlet (85) of the first scroll member (76). In this way, the suction gas flowing through the suction passage (62) flows through the passages (84a, 84b) and through the suction inlet (85) into the outermost pocket of the fluid pockets. A portion of the suction gas flowing through the passages (84a, 84b) can escape into the suction pressure chamber (30). The second scroll member (78) defines a second rotation axis (A2) that is parallel to the rotation axis (A1) and offset from the rotation axis (A1). The second scroll member (78) may include a second end plate (86), a cylindrical hub (88) extending from one side of the second end plate (86), and a second spiral wrap (90) extending from the opposite side of the second end plate (86). A bearing support member (92) (e.g., a generally cylindrical shaft or body having a discharge passage (93)) is fixed to the partition (25) and includes a first end (94) extending at least partially into the discharge pressure chamber (33) and a second end (96) extending into the hub (88) through a bearing (40) (the bearing (40) and the hub (88) are placed within the suction pressure chamber (30)). The discharge passage (93) extends axially through the bearing support member (92) (i.e., through the first and second ends (94, 96)) and provides fluid communication between the compression mechanism (18) and the discharge pressure chamber (33). The hub (88) of the second scroll member (78) is rotatably supported by a bearing (98) (e.g., a needle bearing) located between the hub (88) and the bearing support member (92). A sealing assembly (102) is disposed within the main bearing housing (38) and includes a housing (104) and a sealing member (106). The housing (104) is press-fitted into the main bearing housing (38) such that its outer diametrical surface (107) is sealed to the inner diametrical surface (108) of the main bearing housing (38). The sealing member (106) is disposed within the housing (104) and is sealed to the outer diametrical surface (109) of the bearing support member (92). In this manner, fluid discharged from the fluid pockets of the compression mechanism (18) is prevented from flowing into the bearing (40) and the suction chamber (30). The first and second spiral wraps (82, 90) intermesh with each other to form a plurality of fluid pockets (i.e., compression pockets) between them. The rotation of the first scroll member (76) around the rotation axis (A1) and the rotation of the second scroll member (78) around the second rotation axis (A2) cause the fluid pockets to decrease in size as they move from a radially outer position to a radially inner position, thereby compressing the working fluid from the suction pressure to the discharge pressure. A second end plate (86) may be axially positioned between the first end plate (80) and the main bearing housing (38). Annular seals (110) may be positioned within a groove (111) formed in the axial end surface (42) of the main bearing housing (38) and are sealed and slidably fastened to the second end plate (86) to form an annular biasing chamber (112). The annular seals (110) allow relative movement between the main bearing housing (38) and the second scroll member (78) while keeping the biasing chamber (112) sealed from the suction pressure chamber (30) and exhaust gas. The second end plate (86) may include a biasing passage (not shown) that provides fluid communication between the intermediate pressure compression pocket and the biasing chamber (112).

[0062] The second end plate (86) may include a discharge passage (114) and a plurality of arched pin pockets or scallops (116) (Fig. 3-5). The discharge passage (114) extends through the second end plate (86) and provides fluid communication between the radially innermost fluid pocket among the fluid pockets and the discharge gas outlet fitting (34) (through the passage (93) of the bearing support member (92). A discharge valve (e.g., a reed valve or other check valve) may be positioned within or adjacent to the discharge passage (114) or at the end (94) of the bearing support member (92). The discharge valve allows the working fluid to be discharged from the compression mechanism (18) and flow into the bearing support member (92) through the discharge passage, while preventing the working fluid within the bearing support member (92) from flowing back into the compression mechanism (18). A portion of the exhaust gas flowing from the exhaust passage (114) flows into the exhaust pressure chamber (33) through the passage of the bearing support member (92) and is discharged out of the compressor (10) through the exhaust gas outlet fitting (34). Another portion of the exhaust gas flowing from the exhaust passage (114) flows around the second end (96) of the bearing support member (92), flows through the bearing (98), and can flow into the pocket (115) formed radially between the hub (88) and the bearing housing (38). In this way, the gas in the pocket (115) and the intermediate working fluid of the biasing chamber (112) axially bias the second scroll member (78) toward the first scroll member (76). The pin pockets (116) and pins (41) form a synchronization mechanism. As illustrated in FIGS. 3 through 5, the pin pockets (116) may be spaced apart from each other and formed on the outer diameter surface (117) of the second end plate (86). The pin pockets (116) may also be arranged around the second end plate (86) and may accommodate the corresponding pins (41) of the main bearing housing (38) (each pin (41) extends through the corresponding pin pocket (116) formed in the second end plate (86)). As illustrated in FIG. 5, each pin pocket (116) defines a working surface (118), a non-working surface (120), and a transition surface (122). The operating surface (118) has a first arc center (X). The operating surface (118) spans by an angle A. In some configurations, the angle A is at least 60 degrees. The operating surface (118) spans by an angle A defined as 360 / Npin (Npin is the number of pins). Each pin (41) is configured to engage with the corresponding operating surface (118) during a portion of the rotation of the first scroll member (76), so that energy from the drive shaft (46) is transferred to the second scroll member (78), thereby rotating the second scroll member (78) around the second rotation axis (A2). For example, in the embodiment illustrated in the drawings, one pin (41a) of the six pins (41) is configured to engage with the corresponding operating surface (118) at any given time (the other pins (41) are separated from the corresponding operating surface (118)). In this way, the compressor (10) provides radial compliance (i.e., relative displacement of the axis of rotation (A1) with respect to the axis of rotation (A2)). The non-operating surface (120) has a second arc center (Y) spaced apart from the first arc center (X). Each pin (41) is spaced apart from the corresponding non-operating surface (120) during the movement path within the pin pocket (116) (when the drive shaft (46) and the bearing housing (38) rotate around the first rotation axis (A1), the pin (41) is not engaged with the non-operating surface (120). A transition surface (122) is positioned between the operating surface (118) and the non-operating surface (120). Each pin (41) is configured to be movably engaged with the corresponding transition surface (122) after being engaged with the corresponding operating surface (118) and before being separated from the second end plate (86). When one pin (41) is engaged with the corresponding transition surface (122), the adjacent pin (41) is engaged with the corresponding operating surface (118). For example, as illustrated in FIG. 4, when an adjacent pin (41a) is engaged with a corresponding operating surface (188), the pin (41b) is engaged with a corresponding transition surface (122). While the drive shaft (46) is rotating further, when the pin (41a) crosses the corresponding operating surface (118), the pin (41b) will be separated from the corresponding transition surface (122). One of the advantages of the compressor (10) of the present invention is that the pin (41) is configured to be connected to the second end plate (86) to rotate the second scroll member (78) while still providing radial conformity. The foregoing description is provided for illustrative and illustrative purposes only. It is not comprehensive and is not intended to limit the present disclosure. Individual elements or features of a particular embodiment do not limit the particular embodiment and may be substituted if applicable and may be used in selected embodiments even if they have not been specifically illustrated or described. The same may also be modified in many different ways. Such modifications should not be construed as departing from the present disclosure, and all variations are contained within the scope of the present disclosure.

Claims

Claim 1 A compressor comprising: a shell assembly; a first compression member rotatable about the shell assembly about a first axis; a bearing housing coupled to the first compression member, rotatable about the shell assembly about the first axis, and including a first pin; a second compression member rotatable about the shell assembly about a second axis spaced apart from the first axis, and cooperating with the first compression member to define fluid pockets, and including a base plate and a first pin pocket formed in the base plate to accommodate the first pin; wherein the first compression member is movable between a first position in which the first pin is engaged with the surface of the first pin pocket and a second position in which the first pin is separated from the surface of the first pin pocket, allowing relative radial movement between the first axis and the second axis. Claim 2 A compressor according to claim 1, wherein the first pin pocket is arch-shaped, the surface of the first pin pocket is an operating surface having a first arc center, and the first pin pocket further comprises a non-operating surface having a second arc center spaced apart from the first arc center. Claim 3 In paragraph 2, the operating surface spans a predetermined angle, and the predetermined angle is defined as 360 degrees / number of pins, a compressor. Claim 4 A compressor according to paragraph 2, wherein when the first compression member is in the second position, the first pin is separated from the operating surface and the non-operating surface. Claim 5 In paragraph 2, the first pin pocket further comprises a transition surface disposed between the operating surface and the non-operating surface, and the first compression member is a compressor movable to a third position in which the first pin is movably engaged with the transition surface. Claim 6 In paragraph 2, the bearing housing comprises a second pin, and the second compression member comprises an arched second pin pocket formed in the base plate, the second pin extends through the second pin pocket, the second pin pocket comprises a second operating surface having a third arc center, a second non-operating surface, and a transition surface disposed between the second operating surface and the second non-operating surface, and the second pin engages with the transition surface when the first compression member is in the first position, a compressor. Claim 7 In paragraph 6, the second pin is a compressor adjacent to the first pin. Claim 8 In claim 6, the compressor further comprises a drive shaft, wherein the drive shaft is coupled to the first compression member, and the drive shaft comprises a first housing and a second housing that accommodate corresponding first and second pins to connect the first compression member and a bearing. Claim 9 In claim 1, the compressor, wherein the first pin pocket is formed on the outer diameter surface of the base plate. Claim 10 A compressor according to claim 1, wherein the compressor further comprises a drive shaft, the drive shaft is coupled to the first compression member, and the drive shaft includes a first housing that accommodates the first pin and combines the first compression member with a bearing. Claim 11 A compressor comprising a shell assembly, a first compression member, a bearing housing, and a second compression member, wherein the first compression member is rotatable about the shell assembly about a first axis; the bearing housing is coupled to the first compression member and is rotatable about the shell assembly about the first axis, and the bearing housing includes a plurality of pins extending from itself; the second compression member is rotatable about the shell assembly about a second axis spaced apart from the first axis, and the second compression member cooperates with the first compression member to define fluid pockets, and the second compression member includes a base plate and pin pockets formed on the base plate and receiving corresponding pins, each pin pocket having an operating surface; and the first compression member is movable between a first position in which only one of the plurality of pins is engaged with the operating surface of the corresponding pin pocket and a second position in which the one of the plurality of pins is separated from the operating surface of the corresponding pin pocket and allows relative radial movement between the first axis and the second axis. Claim 12 A compressor according to claim 11, wherein the operating surface of each pin pocket has a first arc center and the non-operating surface of each pin pocket has a second arc center, and the second arc center is spaced apart from the first arc center. Claim 13 A compressor according to claim 12, wherein each pin pocket has a transition surface disposed between the operating surface and the non-operating surface, and only one of the plurality of pins is fastened to the transition surface of the corresponding pin pocket when the first compression member is in the first position. Claim 14 A compressor according to claim 11, wherein the pin pockets are arranged circumferentially and spaced around the base plate, the pins are arranged circumferentially and spaced around the axial end surface of the bearing housing, and the pin pockets are arched and formed on the outer diameter surface of the base plate and extend through the base plate. Claim 15 A compressor comprising a shell assembly, a first compression member, a second compression member, and a pin, wherein the first compression member is rotatable about the shell assembly about a first axis; the second compression member is rotatable about the shell assembly about a second axis spaced apart from the first axis, and the second compression member cooperates with the first compression member to define fluid pockets, and the second compression member includes a base plate and an arched pin pocket formed in the base plate; the pin is coupled to the first compression member and received in the pin pocket; the first compression member is movable between a first position where the pin is engaged with the surface of the pin pocket and a second position where the pin is separated from the surface of the pin pocket, the surface of the pin pocket is an operating surface having a first arc center, and the pin pocket further includes a non-operating surface having a second arc center spaced apart from the first arc center, and the pin pocket further includes a transition surface disposed between the operating surface and the non-operating surface, and the first compression member is such that the pin is engaged with the transition surface Compressor movable to a third position Claim 16 In paragraph 15, the above-mentioned operating surface has a predetermined angle, said predetermined angle is defined as 360 degrees / number of pins, a compressor. Claim 17 In paragraph 15, the pin is a compressor that is separated from the operating surface and the non-operating surface when the first compression member is in the second position. Claim 18 In paragraph 15, the compressor further comprises a bearing housing that is coupled to the first compression member through the pin and rotatable about the shell assembly about the first axis. Claim 19 delete Claim 20 delete

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