Bearing load-bearing component, compressor and refrigerant circulation system

Abstract

The present disclosure provides a bearing carrier component, a compressor, and a refrigerant cycle system. The bearing carrier component includes: a bearing chamber for mounting a radial bearing; a mounting hole coaxially connected to the bearing chamber; a fluid inlet passage communicating the bearing chamber with the outside of the bearing carrier component; and a fluid outlet passage communicating the mounting hole with the outside of the bearing carrier component. The bearing carrier component provided by the present disclosure is conducive to supplying fluid to the radial bearing and maintaining the back pressure of the radial bearing stable, thereby facilitating the stable operation of the compressor.

Description

Technical Field

[0001] The present disclosure relates to the technical fields of compressors and refrigeration, and particularly relates to a bearing support component, a compressor, and a refrigerant circulation system. Background Art

[0002] The aerostatic bearing has the advantages of ultra-high precision, ultra-low friction, ultra-low vibration, ultra-low noise, long service life, pollution-free, etc. At the same time, it is suitable for high-speed and high-precision occasions, and has broad application prospects in centrifugal compressors, especially miniaturized centrifugal compressors. Since the aerostatic bearing requires an external air source for air supply and requires the bearing working back pressure to be stable to prevent the air film from being damaged due to the fluctuation of the bearing back pressure, which may cause the bearing rotor system to become unstable and damaged. Summary of the Invention

[0003] The purpose of the present disclosure is to provide a bearing support component, a compressor, and a refrigerant circulation system.

[0004] The first aspect of the present disclosure provides a bearing support component, including:

[0005] A bearing chamber for installing a radial bearing;

[0006] An installation hole, which is coaxial and communicated with the bearing chamber;

[0007] A fluid inlet channel communicating the bearing chamber with the outside of the bearing support component; and

[0008] A fluid outlet channel communicating the installation hole with the outside of the bearing support component.

[0009] In some embodiments, the bearing support component includes:

[0010] A bearing seat portion, and the bearing chamber is arranged on the bearing seat portion; and

[0011] A diffuser portion, the diffuser portion is integrally arranged side by side with the bearing seat portion along the axial direction of the bearing chamber, a diffusing structure is arranged at one end of the diffuser portion away from the bearing seat portion, and the installation hole is arranged on the diffuser portion.

[0012] In some embodiments, the fluid inlet of the fluid inlet channel is arranged on the end face of the diffuser portion close to the bearing seat portion.

[0013] In some embodiments, the bearing support component includes a plurality of the fluid outlet channels, and the plurality of fluid outlet channels are evenly distributed along the circumferential direction of the bearing support component.

[0014] In some embodiments, the plurality of fluid outlet channels are evenly distributed at intervals of 360° / m along the circumferential direction of the bearing support component, where m is the number of the plurality of fluid outlet channels.

[0015] In some embodiments, the bearing carrier component includes a bearing positioning structure disposed at one end away from the mounting hole for axially positioning the radial bearing.

[0016] In some embodiments, the bearing positioning structure includes an annular groove for mounting a snap ring for axially positioning the radial bearing, and the annular groove is disposed on the side wall of the bearing chamber.

[0017] In some embodiments, the bearing carrier component further includes a diffuser part mounting hole and / or a diffuser part positioning hole disposed on the diffuser part.

[0018] In some embodiments, the bearing carrier component further includes a bearing component positioning stop disposed at one end of the diffuser part close to the bearing seat part.

[0019] In some embodiments, the mounting hole is a stepped hole, including a large-diameter section at one end away from the bearing chamber and a small-diameter section at one end close to the bearing chamber, and a stepped positioning surface is formed between the large-diameter section and the small-diameter section.

[0020] The second aspect of the present disclosure provides a compressor, including:

[0021] A compressor rotor, including a main shaft;

[0022] A radial bearing for supporting the main shaft; and

[0023] A bearing carrier component, which is the bearing carrier component described in the first aspect of the present disclosure, and the radial bearing is installed in the bearing chamber of the bearing carrier component.

[0024] In some embodiments, the radial bearing is a gas bearing.

[0025] In some embodiments, the compressor further includes a shaft seal component, the shaft seal component is installed in the mounting hole of the bearing carrier component, one end of the shaft seal component close to the radial bearing has a bearing positioning end surface, and the bearing positioning end surface cooperates with the end surface of the radial bearing.

[0026] In some embodiments, the shaft seal component includes a shaft seal fluid channel communicating the fluid outflow channel with the gap between the radial bearing and the main shaft.

[0027] In some embodiments, the compressor includes a housing, the bearing carrier component includes a bearing component positioning stop disposed at one end of the diffuser part close to the bearing seat part, and the bearing component positioning stop cooperates with the housing.

[0028] The third aspect of the present disclosure provides a refrigerant circulation system, including the compressor described in the second aspect of the present disclosure.

[0029] According to the bearing support component and the compressor provided by the present disclosure, the bearing support component includes a bearing chamber for installing a radial bearing, a mounting hole coaxial and communicating with the bearing chamber, a fluid inlet passage communicating the bearing chamber with the outside of the bearing support component, and a fluid outlet passage communicating the mounting hole with the outside of the bearing support component. Therefore, the working fluid outside the bearing support component can be led to the bearing chamber for the radial bearing to use through the fluid inlet passage, and the working fluid in the gap between the bearing chamber and the radial bearing can be led out of the bearing support component through the fluid outlet passage, which is beneficial to preventing the fluid from staying near the radial bearing and maintaining the stable back pressure of the radial bearing, thereby facilitating the stable operation of the compressor adopting the bearing support component.

[0030] The compressor and the refrigerant cycle system provided by the present disclosure have the same advantages as the bearing support component provided by the present disclosure.

[0031] Other features and advantages of the present disclosure will become clear through the following detailed description of the exemplary embodiments of the present disclosure with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The drawings described herein are used to provide a further understanding of the present disclosure and constitute a part of this application. The schematic embodiments of the present disclosure and their descriptions are used to explain the present disclosure and do not constitute an improper limitation to the present disclosure. In the drawings:

[0033] Figure 1 is a schematic structural diagram of a compressor according to an embodiment of the present disclosure.

[0034] Figure 2 is a cross-sectional structural diagram of a bearing support component according to an embodiment of the present disclosure.

[0035] Figure 3 is Figure 2 a left-view structural diagram of the bearing support component shown.

[0036] Figure 4 is a partial structural diagram of a compressor according to an embodiment of the present disclosure.

[0037] Figure 5 is a three-dimensional structural diagram of a shaft seal component of a compressor according to an embodiment of the present disclosure. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0038] Next, the technical solutions in the embodiments of the present disclosure will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present disclosure. Obviously, the described embodiments are only a part of the embodiments of the present disclosure, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and in no way constitutes a limitation on the present disclosure and its application or use. Based on the embodiments in the present disclosure, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present disclosure.

[0039] Unless otherwise specifically stated, the relative arrangements of components and steps, numerical expressions and values set forth in these embodiments do not limit the scope of the present disclosure. At the same time, it should be understood that, for the sake of convenience of description, the dimensions of the various parts shown in the drawings are not drawn in actual proportional relationship. Technologies, methods and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods and devices should be regarded as part of the authorization specification. In all the examples shown and discussed here, any specific value should be construed as merely exemplary, and not as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numerals and letters denote like items in the following drawings, and thus, once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0040] In the description of the present disclosure, it should be understood that the use of words such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Without further statement, the above words have no special meaning and thus cannot be construed as limiting the scope of protection of the present disclosure.

[0041] In the description of the present disclosure, it should be understood that orientation words such as "front, rear, upper, lower, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are only for the convenience of describing the present disclosure and simplifying the description. Without contrary description, these orientation words do not indicate and imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and thus cannot be construed as limiting the scope of protection of the present disclosure; the orientation words "inside, outside" refer to the inside and outside relative to the contour of each component itself.

[0042] As Figures 1 to 4 shown, an embodiment of the present disclosure discloses a bearing carrier member 60. The bearing carrier member 60 includes: a bearing chamber for mounting a radial bearing; a mounting hole 67 coaxial and communicating with the bearing chamber 62; a fluid inlet passage 63 communicating the bearing chamber 62 with the outside of the bearing carrier member; and a fluid outlet passage 64 communicating the mounting hole 67 with the outside of the bearing carrier member.

[0043] The bearing carrier member 60 includes a bearing chamber for mounting a radial bearing, a mounting hole 67 coaxial and communicating with the bearing chamber 62, a fluid inlet passage 63 communicating the bearing chamber 62 with the outside of the bearing carrier member 60, and a fluid outlet passage 64 communicating the mounting hole 67 with the outside of the bearing carrier member. Therefore, the working fluid outside the bearing carrier member 60 can be led to the bearing chamber through the fluid inlet passage 63 for use by the radial bearing, and the working fluid in the gap between the bearing chamber 62 and the radial bearing can be led out of the bearing carrier member 60 through the fluid outlet passage 64, which is beneficial to the stability of the back pressure of the radial bearing.

[0044] In some embodiments, the bearing carrier member 60 includes a diffuser portion and a bearing housing portion. The bearing chamber 62 is provided in the bearing housing portion. The diffuser portion and the bearing housing portion are integrally arranged side by side along the axial direction of the bearing chamber 62. A diffuser structure is provided at one end of the diffuser portion away from the bearing housing portion, and the mounting hole 67 is provided in the diffuser portion.

[0045] In the bearing carrier member 60 of the embodiment of the present disclosure, the diffuser and the bearing housing are designed as one part, and at the same time, a mounting hole is provided, integrating the functions of the diffuser and the bearing housing, which is beneficial to reducing the number of parts, improving the assembly efficiency, and also beneficial to reducing the rotor length and improving the stability of the bearing rotor system.

[0046] As Figures 1 to 4 shown, in some embodiments, the bearing carrier member 60 includes a fluid inlet passage 63 communicating the bearing chamber 62 with the outside of the bearing carrier member 60. The fluid inlet passage 63 can supply the fluid required for supporting the main shaft 21 to the radial bearing, such as a suspension gas. The fluid inlet passage 63 can be, for example, a duct provided inside the bearing carrier member 60. The aperture of the duct can be, for example, more than 3 mm.

[0047] As Figures 1 to 4 shown, in some embodiments, the fluid inlet of the fluid inlet passage 63 is provided on the end face of the diffuser portion near the bearing housing portion. This setting is beneficial to introducing the fluid from the outside, such as inside the housing 10 of the compressor, into the fluid inlet passage 63.

[0048] As Figures 1 to 4 shown, in some embodiments, the bearing carrier member 60 includes a fluid outlet passage 64 communicating the mounting hole 67 with the outside of the bearing carrier member 60. This setting is beneficial to preventing the fluid from staying near the radial bearing, beneficial to maintaining the stability of the back pressure of the radial bearing, and thus beneficial to the stable operation of the compressor. The fluid outlet passage 64 is a duct provided inside the bearing structure 60. As Figures 1 to 4 shown, the fluid outlet of the fluid outlet passage 64 is provided on the end face of the second axial end of the diffuser portion and / or on the outer peripheral surface of the bearing housing portion.

[0049] As Figures 1 to 4As shown, in some embodiments, the bearing carrier member 60 includes a plurality of fluid outflow channels 64. This arrangement facilitates the rapid and uniform discharge of fluid near related components such as the radial bearing, and helps prevent fluid from stagnating near the related components.

[0050] As Figures 1 to 4 shown, in some embodiments, the plurality of fluid outflow channels 64 are circumferentially evenly distributed along the bearing carrier member 60. This arrangement facilitates the rapid and uniform discharge of fluid near related components such as the radial bearing, and helps prevent fluid from stagnating near the related components.

[0051] As Figures 1 to 4 shown, in some embodiments, the plurality of fluid outflow channels 64 are circumferentially spaced 360° / (m + 1), where m is the number of the plurality of fluid outflow channels 64. In the Figures 1 to 4 embodiment shown, m = 5. At the position where the fluid outflow channels 64 are not arranged circumferentially on the bearing carrier member 60, fluid inlet channels 63 are arranged. This arrangement can make all the fluid channels of the bearing carrier member 60 be approximately evenly distributed, which is beneficial for the processing of the fluid channels and the accurate positioning during the assembly of the bearing carrier member 60. The number and distribution pattern of the shaft seal fluid channels of the shaft seal member 70 described later correspond to the number and distribution pattern of the fluid outflow channels 64 provided on the bearing carrier member 60.

[0052] As Figures 1 to 4 shown, in some embodiments, the bearing carrier member 60 includes a bearing positioning structure for axially positioning the radial bearing at one end away from the mounting hole 67. The bearing positioning structure includes an annular groove 66 for installing a snap ring 81 for axially positioning the radial bearing 43, and the annular groove 66 is provided on the side wall of the bearing chamber 62.

[0053] As Figure 3 shown, in some embodiments, the bearing carrier member 60 further includes a diffuser section mounting hole and / or a diffuser section positioning hole 69 provided on the diffuser section. The diffuser section positioning hole 69 is used to cooperate with a positioning pin to circumferentially position the bearing carrier member 60. The diffuser section mounting hole is used to cooperate with a threaded connector to mount the bearing carrier member 60 on related components such as the housing 10 of the compressor.

[0054] As Figures 1 to 4 shown, in some embodiments, the bearing carrier member 60 further includes a bearing carrier member positioning stop 68 provided at one end of the diffuser section close to the bearing seat section. The bearing carrier member positioning stop 68 can achieve the radial and axial positioning of the bearing carrier member 60.

[0055] As Figures 1 to 4As shown, in some embodiments, the mounting hole 67 is a stepped hole, including a large-diameter section near the end away from the bearing chamber 62 and a small-diameter section near the end of the bearing chamber 62. A stepped positioning surface 65 is formed between the large-diameter section and the small-diameter section. This setting facilitates the directional and axial positioning between the shaft seal component 70 and the bearing carrier component 60. When there is a clearance fit between the bearing positioning end face 721 of the shaft seal component 70 and the end face of the radial bearing, it also facilitates the axial positioning of the radial bearing.

[0056] As Figure 1 shown, an embodiment of the present disclosure also provides a compressor. The compressor includes a compressor rotor 20, a radial bearing, and a bearing carrier component 60. The compressor rotor 20 includes a main shaft 21. The radial bearing is used to support the main shaft 21. The bearing carrier component 60 is the bearing carrier component 60 in the foregoing embodiment, and the radial bearing is installed in the bearing chamber 62 of the bearing carrier component 60. The bearing carrier component 60 integrates the functions of a diffuser, a bearing housing, and a shaft seal mounting seat, which is conducive to reducing the number of parts, improving the assembly efficiency, and also conducive to reducing the length of the compressor rotor and improving the operating stability of the compressor.

[0057] In some embodiments, the radial bearing is a gas bearing.

[0058] As Figures 1 to 5 shown, in some embodiments, the compressor further includes a shaft seal component 70. The shaft seal component 70 is installed in the mounting hole 67 of the bearing carrier component 60. One end of the shaft seal component 70 close to the radial bearing has a bearing positioning end face 721, and the bearing positioning end face 721 cooperates with the end face of the radial bearing. The bearing carrier component 60 simultaneously undertakes the functions of a diffuser, a bearing housing, and the installation of the shaft seal component. Installing the shaft seal component 70 and the radial bearing in the bearing carrier component 60 is conducive to shortening the length of the compressor rotor, reducing the weight of the compressor rotor, and conducive to increasing the critical speed of the compressor rotor. The cooperation of the bearing carrier component 60, the shaft seal component 70, and the radial bearing is conducive to making the structure and layout of the compressor compact and enabling rapid and accurate assembly.

[0059] As Figures 1 to 4 shown, in some embodiments, the shaft seal component 70 includes a shaft seal fluid channel that communicates the fluid outflow channel 64 with the gap between the radial bearing and the main shaft 21. The shaft seal fluid channel communicates with the fluid outflow channel 64. This setting is conducive to preventing fluid from staying near the radial bearing, conducive to maintaining the back pressure stability of the radial bearing, and thus conducive to the stable operation of the compressor.

[0060] As Figure 1 、 Figure 4 and Figure 5As shown, in some embodiments, the shaft seal component 70 includes a shaft seal disk body 71 and a shaft seal positioning stop 72. The center of the shaft seal disk body 71 has a shaft hole, and a shaft seal structure is provided on the hole wall of the shaft hole. The shaft seal positioning stop 72 is coaxially and integrally provided at one axial end of the shaft seal disk body 71, and a shaft seal fluid passage communicating the radially inner side and the radially outer side of the shaft seal positioning stop 72 is provided on the shaft seal positioning stop 72.

[0061] The shaft seal component 70 combines the functions of shaft sealing, positioning, and fluid discharging. The shaft seal positioning stop 72 is beneficial to improving the fitting accuracy between the shaft seal component 70 and the main shaft 21 to be sealed, and can more effectively prevent fluid leakage. The shaft seal fluid passage is beneficial to preventing fluid from staying in components such as radial bearings that cooperate with the shaft seal component 70, and is beneficial to stabilizing the back pressure of related components, thereby being beneficial to improving the stability of the bearing rotor system.

[0062] As Figure 1 , Figure 4 and Figure 5 shown, in some embodiments, the shaft seal structure of the shaft seal component 70 includes a comb tooth structure 711. The comb tooth structure 711 is more suitable for sealing gas, is suitable for application in a compressor, and can effectively prevent the leakage of pressurized gas.

[0063] As Figure 1 , Figure 4 and Figure 5 shown, in some embodiments, one end of the shaft seal positioning stop 72 away from the shaft seal disk body 71 has a bearing positioning end face 721 for axially positioning the radial bearing. The bearing positioning end face 721 enables the shaft seal component 70 to also have the function of axially positioning the radial bearing, which is beneficial to simplifying the structure of the device where it is located and shortening the rotor length of the device where it is located.

[0064] The structural form of the shaft seal fluid passage can be various. For example, as Figure 1 , Figure 4 and Figure 5 shown, in some embodiments, the shaft seal fluid passage includes a groove 722 that recesses from one end away from the shaft seal disk body 71 towards one end close to the shaft seal disk body 71. In an embodiment not shown, the shaft seal fluid passage can include at least one through hole provided on the side wall of the shaft seal positioning stop 72. A groove and a through hole can also be provided simultaneously as the shaft seal fluid passage.

[0065] As Figure 1 , Figure 4 and Figure 5 shown, in some embodiments, the shaft seal component 70 includes a plurality of shaft seal fluid passages. The plurality of shaft seal fluid passages are uniformly arranged along the circumferential direction of the shaft seal positioning stop 72. This arrangement is beneficial to the rapid and uniform discharge of fluid near related components such as radial bearings, and is beneficial to preventing fluid from staying near related components.

[0066] In some embodiments, a plurality of shaft seal fluid channels are uniformly arranged at an angular interval of 360° / n + 1 in the circumferential direction of the shaft seal positioning stop 72, where n is the number of the plurality of shaft seal fluid channels. The number of n can be 2, 3, 4, 5, 6 or more. As Figure 1 , Figure 4 and Figure 5 shown in the embodiments, n = 5. The number and distribution mode of the shaft seal fluid channels are conducive to corresponding to the number and distribution mode of the fluid outflow channels 64 provided on the bearing support member 60. This setting mode is conducive to the bearing support member 60 cooperating to form a fluid discharge path and is conducive to reserving a setting position for the setting of the fluid inlet channels of related components.

[0067] As Figure 5 shown, in some embodiments, the shaft seal fluid channels of the shaft seal member 70 are a plurality of grooves 722 provided on the shaft seal positioning stop 72. The number of the grooves 722 is not limited, for example, it can be 3 - 12. The number of the fluid outflow channels 64 of the bearing support structure 60 is the same as that of the grooves 722.

[0068] In addition, the shaft seal member 70 includes a shaft seal connection hole 712 and a shaft seal positioning hole 713 provided on the shaft seal disk body 71. The shaft seal positioning hole 713 can accurately determine the connection position between the shaft seal member 70 and the bearing support member 60, which is conducive to quickly and accurately connecting the shaft seal fluid channels with the fluid outflow channels 64 of the bearing support member 60. The shaft seal connection hole 712 is conducive to realizing detachable connection with related components through threaded connectors.

[0069] As Figure 1 , Figure 4 and Figure 5 shown, in some embodiments, the diameter of the inner circumferential surface of the shaft seal positioning stop 72 is larger than the diameter of the shaft hole of the shaft seal disk body 71. This setting is conducive to connecting the shaft seal fluid channels with the gap between the radial bearing and the main shaft 21 and is conducive to the uniform distribution of the fluid among the shaft seal fluid channels.

[0070] As Figure 1 , Figure 4 and Figure 5 shown, in the compressor of the embodiments of the present disclosure, the shaft seal structure of the shaft seal member 70 cooperates with the main shaft 21. The shaft seal fluid channels are connected with the gap between the radial bearing and the main shaft 21. This setting is conducive to preventing the fluid from staying near the radial bearing and is conducive to maintaining the stable back pressure of the radial bearing, thereby being conducive to ensuring the stable operation of the compressor.

[0071] As Figure 1 , Figure 4 and Figure 5As shown, in some embodiments, one end of the shaft seal positioning stop 72 away from the shaft seal disk body 71 has a bearing positioning end face 721 for axially positioning the radial bearing, and the bearing positioning end face 721 is in clearance fit with the corresponding end face of the radial bearing. This setting enables the shaft seal component 70 to simultaneously undertake the axial positioning function of the radial bearing, which is beneficial for shortening the length of the compressor rotor, reducing the weight of the compressor rotor and the whole machine, and simplifying the compressor structure.

[0072] As Figures 1 to 4 shown, in some embodiments, the mounting hole 67 is a stepped hole, including a large-diameter section at one end close to the diffuser structure and a small-diameter section at one end away from the diffuser structure. The shaft seal disk body 71 is installed in the large-diameter section and cooperates with the large-diameter section, and the shaft seal positioning stop 72 is installed in the small-diameter section and cooperates with the small-diameter section. A stepped positioning surface 65 is formed between the large-diameter section and the small-diameter section, and the end face 714 of the shaft seal disk body 71 close to the positioning ring is in clearance fit with the stepped positioning surface 65. This setting is beneficial for the axial positioning of the bearing component 70. At the same time, since the shaft seal component undertakes the axial positioning function of the radial bearing, it is also beneficial for the axial positioning of the radial bearing.

[0073] As Figure 1 shown, the bearing carrier component 60 includes a carrier component positioning stop 68 provided at one end of the diffuser close to the bearing seat part, and a diffuser part positioning hole 69 and a diffuser part mounting hole provided on the diffuser part. The carrier component positioning stop 68 cooperates with the inner wall of the right end of the motor cylinder 11 of the housing 10 of the compressor to determine the radial position and axial position of the bearing carrier component 60. The bearing carrier component 60 is circumferentially positioned with the housing 10 through a positioning member passing through the diffuser part positioning hole 69, and is fixedly connected to the housing 10 through a threaded connecting member passing through the diffuser part mounting hole.

[0074] The embodiments of the present disclosure further provide a refrigerant circulation system, including the compressor of the embodiments of the present disclosure.

[0075] The compressor and the refrigerant circulation system of the embodiments of the present disclosure have the corresponding advantages of the bearing carrier component 60 of the embodiments of the present disclosure.

[0076] The following further combines Figures 1 to 5 to describe some embodiments of the present disclosure in more detail.

[0077] As Figure 1 shown, the compressor mainly includes a housing 10, a compressor rotor 20, a motor stator 30, a bearing assembly, a first-stage diffuser 50, a bearing carrier component 60, and a shaft seal component 70.

[0078] The housing 10 includes a motor cylinder 11 and a first-stage volute 12 and a second-stage volute 13 respectively connected to the left and right ends of the motor cylinder 11. The left end of the motor cylinder 11 has an end wall, and the right end is open.

[0079] The first-stage diffuser 50, the bearing support member 60, and the shaft seal member 70 installed in the mounting hole 67 of the bearing support member 60 are respectively disposed at the left and right ends of the motor cylinder 11, and divide the internal space of the housing 10 into a motor accommodation chamber 14 in the middle of the housing 10, a first-stage compression chamber 15 at the left end of the housing 10, and a second-stage compression chamber 16 at the right end of the housing 10.

[0080] The compressor rotor 20 mainly includes a main shaft 21, a first-stage impeller 22, a second-stage impeller 23, and a thrust disc member 24.

[0081] The motor stator 30 is fixed to the inner wall of the motor cylinder 11 and has a rotor mounting hole. A spiral groove can be provided on the inner wall of the motor cylinder 11 for introducing a cooling fluid for cooling the motor stator 30.

[0082] The main shaft 21 is disposed within the motor stator 30 and penetrates through the rotor mounting hole of the motor stator 30. A permanent magnet for generating a magnetic field is provided in the middle of the main shaft 21, and a first end shaft section and a second end shaft section are respectively provided at the left and right ends of the permanent magnet. Therefore, in this embodiment, the main shaft 21 is also the motor rotor of the motor of the compressor. The motor stator 30 and the main shaft 21 constitute the motor of the compressor. When the winding of the motor stator 30 is energized, it drives the main shaft 21 to rotate, thereby driving the entire compressor rotor to rotate.

[0083] The first-stage impeller 22 and the second-stage impeller 23 are respectively fixedly connected to the left and right ends of the main shaft 21. The diffusing structures of the first-stage impeller 22 and the first-stage diffuser 50 are located in the first-stage compression chamber 15. The diffusing structures of the second-stage impeller 23 and the bearing support member 60 are located in the second-stage compression chamber 16.

[0084] The thrust disc member 24 is disposed close to the first-stage impeller 22 and includes a thrust disc and an integrally provided mounting sleeve. The thrust disc member 24 is fixedly sleeved on the outer periphery of the first end shaft section of the main shaft 21. The mounting sleeve is located between the first-stage impeller 22 and the thrust disc. The thrust disc member 24 can be sleeved on the first end shaft section of the main shaft 21 by means of hot shrinking.

[0085] The bearing assembly includes a thrust bearing assembly 41, a first radial bearing 42, and a second radial bearing.

[0086] As Figure 1 shown, the thrust bearing assembly 41 includes a first thrust bearing 411, a second thrust bearing 412, and a thrust bearing positioning ring 413. In Figures 1 to 5 the embodiment shown, the first thrust bearing 411, the second thrust bearing 412, the first radial bearing 42, and the second radial bearing are all hydrostatic gas bearings.

[0087] The left end of the first-stage diffuser 50 has a diffusing structure, such as a diffusing surface or diffusing vanes. A shaft hole is provided at the center of the first-stage diffuser 50, and a shaft seal structure, such as a comb structure, is provided in the shaft hole. The mounting sleeve of the thrust disc assembly 24 is located in the shaft hole of the first-stage diffuser 50 and cooperates with the shaft seal structure provided in the shaft hole. The radially outer end of the first-stage diffuser 50 is sealingly fixed to the end wall of the motor cylinder 11, so that the first-stage diffuser 50 isolates the first-stage compression chamber 15 at the left end of the housing 10 from the motor accommodation chamber 14 in the middle of the housing 10.

[0088] such as Figure 1 As shown, the right end of the first-stage diffuser 50 has a diffuser positioning stop, and the left end of the end wall of the motor cylinder 11 has a diffuser mounting opening. The diffuser positioning stop of the first-stage diffuser 50 is installed in the diffuser mounting opening and cooperates with the diffuser mounting opening, so as to realize the axial and radial positioning of the first-stage diffuser 50. The interior of the diffuser positioning stop of the first-stage diffuser 50 and the bottom wall of the diffuser mounting opening of the motor cylinder 11 enclose a thrust bearing assembly installation chamber.

[0089] The thrust bearing assembly 41 is arranged in the thrust bearing assembly installation chamber. The left and right end faces of the thrust disc of the thrust disc assembly 24 respectively cooperate with the first thrust face of the first thrust bearing 411 and the second thrust face of the second thrust bearing 412, so that the thrust disc and the first thrust bearing 411 and the second thrust bearing 412 jointly define the axial position of the compressor rotor 21.

[0090] A first positioning surface is further provided at the radially outer end of the first thrust face of the first thrust bearing 411, and a second positioning surface is further provided at the radially outer end of the second thrust face of the second thrust bearing 412. The left and right end faces of the thrust bearing positioning ring 413 respectively have a clearance fit with the first positioning surface and the second positioning surface. Thus, the distance between the left and right end faces of the thrust bearing positioning ring 413 can define the distance between the first thrust face and the second thrust face, and can define the sum of the clearance between the thrust disc and the first thrust face and the clearance between the thrust disc and the second thrust face. The thrust bearing positioning ring 413 is fixedly connected to the second thrust bearing 42 and the end wall of the motor cylinder 11 through a threaded connector.

[0091] The thrust bearing positioning ring 413 is provided with a positioning ring fluid passage for communicating its radially inner side and radially outer side. The positioning ring fluid passage is conducive to ensuring the back pressure stability of the thrust bearing assembly, and thus conducive to the stable operation of the compressor.

[0092] A bearing chamber is provided in the radial middle of the end wall of the motor cylinder body 10, and the first radial bearing 42 is arranged in the bearing chamber of the end wall. The left end of the first radial bearing 42 is in clearance fit with the side of the second thrust bearing 412 away from the second thrust surface, and the right end of the first radial bearing 42 is in clearance fit with the snap ring 82 installed in the card slot of the bearing chamber of the end wall, so that the axial position of the first radial bearing 42 is jointly determined by the second thrust bearing 412 and the snap ring 82.

[0093] The bearing carrier component 60 integrates a diffuser ( Figure 1 In the illustrated embodiment, it is a two-stage diffuser) and a bearing seat, and the second radial bearing 43 is installed in the bearing chamber 62 of the bearing carrier component 60. The second radial bearing 43 is sleeved on the outer circumference of the second end shaft section of the main shaft 21.

[0094] The shaft seal component 70 is fixedly installed in the mounting hole 67 of the bearing carrier component 60. As described above, the bearing carrier component 60 is fixedly installed at the right end of the motor cylinder body 11. And there is a sealed connection between the bearing carrier component 60 and the motor cylinder body 11. After the shaft seal component 70 is installed on the bearing carrier component 60 and sleeved on the main shaft 21, a seal is formed between the shaft seal structure in the shaft hole of the bearing component 70 and the second end shaft section of the main shaft 21, and the radially outer end of the bearing component 70 is sealedly connected to the radially inner end of the bearing carrier component 60, so that the shaft seal component 70 and the bearing carrier component 60 isolate the second compression chamber 16 of the housing 10 from the motor accommodation chamber 14.

[0095] After the bearing carrier component 60, the shaft seal component 70 and the second radial bearing 43 are assembled, the bearing positioning end face 721 of the shaft seal component 70 is in clearance fit with the right end face of the second radial bearing 43, and the left end of the second radial bearing 43 is in clearance fit with the snap ring 81, so that the axial position of the second radial bearing 43 is jointly determined by the shaft seal component 70 and the snap ring 81. At the same time, the respective shaft seal fluid channels of the shaft seal component 70 are correspondingly communicated with the respective fluid outflow channels 64 of the bearing carrier component 60.

[0096] As Figure 1 shown, a first gas inlet channel 17 for supplying suspension gas to the first radial bearing 42 and the second radial bearing 43 is provided on the motor cylinder body 11. The fluid inlet channel 63 of the bearing carrier component 60 is communicated with the first gas inlet channel 17 through the fluid inlet provided on the end face of its diffuser part, so that the suspension gas can be introduced into the bearing chamber of the bearing carrier component 60, and enter the gap between the second radial bearing 43 and the second end shaft section of the main shaft 21 through the porous medium of the second radial bearing 43, then enter the inner cavity of the positioning ring 72 of the shaft seal component 70, and then enter the respective fluid outflow channels 64 of the corresponding bearing carrier component 60 through the respective shaft seal fluid channels, and then enter the motor accommodation chamber 14, and then flow out of the housing 10 from the outlet (not shown) provided on the motor cylinder body 11.

[0097] In this embodiment, a second gas inlet passage for supplying suspension gas to the thrust bearing assembly 41 is further provided on the housing 10, and the second gas inlet passage is independent of the first gas inlet passage. The suspension gas in the second gas inlet passage is respectively supplied into the first thrust bearing 411 and the second thrust bearing 412, and enters the gaps between the first thrust surface and the thrust disk and between the second thrust surface and the thrust disk through the porous media of the first thrust bearing 411 and the second thrust bearing 412, and then flows to the motor accommodation cavity 14 through the positioning ring fluid passage on the thrust bearing positioning ring 413. The positioning ring fluid passage on the thrust bearing positioning ring 413 facilitates timely discharge of the suspension gas, ensuring stable back pressure of the thrust bearing assembly 41.

[0098] In some embodiments not shown, the second gas inlet passage may be communicated with the first gas inlet passage, so that suspension gas can be supplied to each branch passage and each gas bearing corresponding to the branch passage through the same housing air inlet and the same main flow passage.

[0099] As Figure 4 shown, the arrows therein indicate the flow path of the suspension gas supplied to the second radial bearing 43. The suspension gas enters the fluid inlet passage 63 and the bearing chamber 62 of the bearing support member 60 from the first gas inlet passage 17 at the bottom of the motor cylinder 11, and then is supplied to the second radial bearing 43. The suspension gas enters the interior of the second radial bearing 43, is throttled by the porous medium of the second radial bearing 43, and enters the gap between the second radial bearing 43 and the main shaft 21. The suspension gas forms an air film in the gap between the second radial bearing 43 and the main shaft 21, floating the main shaft 21, and then is discharged from both ends of the gap. The suspension gas discharged from the left end enters the motor accommodation cavity 14, and then is discharged from the housing 10 together with the cooling gas for cooling the motor. The suspension gas discharged from the right end enters each fluid outlet passage 64 of the bearing support structure 60 through each shaft seal fluid passage on the shaft seal member 70, and then enters the motor accommodation cavity 14, and is discharged from the housing 10 together with the cooling gas for cooling the motor.

[0100] The hydrostatic gas bearing requires high precision, and the bearing clearance is generally below 10 μm. The sealing clearance of the shaft seal structure of the shaft seal member 70 is also preferably as small as possible under the condition of ensuring relative rotation. For example, the sealing clearance can be as low as 0.02 mm. Such a small sealing clearance requires high coaxiality between the shaft seal structure and the main shaft 21. The shaft seal member 70 is positioned with compressor-related components such as the bearing support member 70 and the housing 10 through the shaft seal positioning stop 72, which is beneficial to ensuring the coaxiality between its shaft seal structure and the main shaft 21.

[0101] The shaft seal structure is set as a comb structure, which cooperates with the main shaft 21 to prevent the exhaust gas of the second-stage impeller 23 of the compressor from entering the bearing chamber 62 of the bearing support component 60, which is beneficial to reducing the leakage loss of the compressor, improving the energy efficiency of the compressor, and also beneficial to preventing the back pressure of the bearing chamber 62 from increasing due to excessive leakage.

[0102] The back pressure of the bearing chamber 62 affects the gas film pressure distribution between the second radial bearing 43 and the main shaft 21, thereby affecting the bearing stiffness and damping, and the bearing stiffness and damping in turn affect the rotor dynamic stability. On the other hand, the bearing back pressure fluctuation will also cause bearing whirl. Therefore, during the use of the hydrostatic gas bearing, ensuring the back pressure stability is beneficial to ensuring the stability of the bearing-rotor system. The shaft seal fluid passage of the shaft seal component 70 and the fluid outflow passage 64 of the bearing support structure 60 prevent the gas discharged from the left end from staying in the shaft seal component 70 and the bearing support component 60, thus effectively preventing the bearing back pressure of the second radial bearing 43 from being unstable.

[0103] The bearing positioning end face 721 of the shaft seal component 70 is in clearance fit with the right end face of the second radial bearing 43, and together with the snap ring 81, it limits the axial position of the second radial bearing 43, which can prevent the second radial bearing 43 from moving axially left and right and causing bearing instability.

[0104] It can be seen that the shaft seal component 70 of the present disclosure embodiment is beneficial to reducing the leakage loss and ensuring the stable working back pressure of the radial bearing adjacent to the shaft seal component 70, thereby being beneficial to improving the energy efficiency of the compressor and the stability of the bearing-rotor system.

[0105] In the bearing support component 60 of the present disclosure embodiment, the diffuser and the bearing seat are designed as one part, and at the same time, a shaft seal mounting hole is provided, integrating the functions of the diffuser, the bearing seat and the shaft seal mounting seat, which is beneficial to reducing the number of parts, improving the assembly efficiency, and also beneficial to reducing the length of the compressor rotor and improving the stability of the bearing-rotor system.

[0106] Since the bearing support component 60 has a fluid inlet passage 63 and a fluid outlet passage 64, it is beneficial to ensure the normal operation of the second radial bearing 43 and the stable working back pressure, beneficial to improving the stability of the bearing-rotor system, and at the same time has the function of a diffuser part, reducing the number of parts, reducing the length of the compressor rotor, and improving the stability of the bearing-rotor system.

[0107] The bearing load-bearing component 60 is double-positioned by means of the load-bearing component positioning stop 68 cooperating with the positioning pin in the positioning hole 69 of the diffuser section. Using the load-bearing component positioning stop 68 and the right end face and inner wall surface of the motor cylinder body 11 can ensure the coaxiality of the bearing load-bearing component 60 and its bearing chamber 62 with the main shaft 21, and further ensure the coaxiality of the second radial bearing 43 with the main shaft 21 after assembly. By means of the cooperation of the pin and the positioning hole 69 of the diffuser section, the circumferential precise positioning of the bearing load-bearing component 60 can be achieved. Therefore, the bearing load-bearing component 60 can improve the assembly efficiency and accuracy.

[0108] Since the bearing clearance of the hydrostatic gas bearing is generally several micrometers to dozens of micrometers, the rotary machinery supported by the hydrostatic gas bearing has extremely high requirements for the coaxiality of the two radial bearings. If the coaxiality is poor, the bearing performance will be reduced, and in severe cases, the rotor cannot float. Therefore, the bearing load-bearing structure 60 and the bearing component 70 cooperating therewith in the embodiments of the present disclosure are both applicable to compressors using hydrostatic gas bearings for load-bearing. Of course, although the bearing load-bearing component 60 and the shaft seal component 70 in the embodiments of the present disclosure are applicable to compressors using gas bearings, such as centrifugal compressors, it does not exclude the use of the bearing load-bearing component 60 and the shaft seal component 70 in the embodiments of the present disclosure in other rotating systems.

[0109] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present disclosure and not to limit them; although the present disclosure has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that: modifications can still be made to the specific implementation manners of the present disclosure or equivalent replacements can be made to some technical features, and they should all be covered by the scope of the technical solutions claimed in the present disclosure.

Claims

1. A compressor, characterized in that, Comprising: A compressor rotor (20), including a main shaft (21); A radial bearing for supporting the main shaft (21); A shaft seal component (70), including a shaft seal disc body (71) and a shaft seal positioning stop (72). The shaft seal disc body (71) has a shaft hole at its center. A shaft seal structure cooperating with the main shaft (21) is provided on the hole wall of the shaft hole. The shaft seal positioning stop (72) is coaxially and integrally provided at one axial end of the shaft seal disc body (71); and A bearing supporting component (60), including a bearing chamber (62), a mounting hole (67), a fluid inlet channel (63) and a fluid outlet channel (64). The radial bearing is installed in the bearing chamber (62). The mounting hole (67) is coaxial with and communicates with the bearing chamber (62). The shaft seal component (70) is installed in the mounting hole (67). The fluid inlet channel (63) communicates the bearing chamber (62) with the outside of the bearing supporting component (60). The fluid outlet channel (64) communicates the mounting hole (67) with the outside of the bearing supporting component (60); Wherein, one end of the shaft seal component (70) close to the radial bearing has a bearing positioning end face (721). The bearing positioning end face (721) cooperates with the end face of the radial bearing. The shaft seal component (70) includes a shaft seal fluid channel communicating the fluid outlet channel (64) with the gap between the radial bearing and the main shaft (21). The bearing positioning end face (721) is provided at one end of the shaft seal positioning stop (72) away from the shaft seal disc body (71) to axially position the radial bearing. The shaft seal fluid channel is provided on the shaft seal positioning stop (72) and communicates the radially inner side and the radially outer side of the shaft seal positioning stop (72).

2. The compressor according to claim 1, wherein The bearing supporting component (60) includes: A bearing seat portion, where the bearing chamber (62) is provided in the bearing seat portion; and A diffuser portion, which is integrally arranged side by side with the bearing seat portion along the axial direction of the bearing chamber (62). A diffusing structure is provided at one end of the diffuser portion away from the bearing seat portion. The mounting hole (67) is provided in the diffuser portion.

3. The compressor according to claim 2, characterized in that, The fluid inlet of the fluid inlet channel (63) is provided on the end face of the diffuser portion close to the bearing seat portion.

4. The compressor according to claim 1, characterized in that The bearing supporting component (60) includes a plurality of the fluid outlet channels (64), and the plurality of fluid outlet channels (64) are evenly distributed along the circumferential direction of the bearing supporting component (60).

5. The compressor according to claim 4, characterized in that, The plurality of fluid outlet channels (64) are evenly distributed at intervals of 360° / (m + 1) along the circumferential direction of the bearing supporting component (60), where m is the number of the plurality of fluid outlet channels (64).

6. The compressor according to claim 1, characterized in that, The bearing supporting component (60) includes a bearing positioning structure provided at one end away from the mounting hole (67) for axially positioning the radial bearing.

7. The compressor according to claim 6, characterized in that, The bearing positioning structure includes an annular groove (66) for mounting a snap ring (81) for axially positioning the radial bearing (43), and the annular groove (66) is provided on the side wall of the bearing housing (62).

8. The compressor according to any one of claims 2 to 7, characterized in that, The bearing carrier member (60) includes a bearing seat portion and a diffuser portion, and the bearing carrier member (60) further includes a diffuser portion mounting hole and / or a diffuser portion positioning hole (69) provided on the diffuser portion.

9. The compressor according to any one of claims 2 to 7, characterized in that, The bearing carrier member (60) includes a bearing seat portion and a diffuser portion, and the bearing carrier member (60) further includes a carrier member positioning stop (68) provided at one end of the diffuser portion close to the bearing seat portion.

10. The compressor according to any one of claims 1 to 7, characterized in that, The mounting hole (67) is a stepped hole, including a large-diameter section at one end away from the bearing housing (62) and a small-diameter section at one end close to the bearing housing (62), and a stepped positioning surface (65) is formed between the large-diameter section and the small-diameter section.

11. The compressor according to any one of claims 1 to 7, characterized in that, The radial bearing is a gas bearing.

12. The compressor according to any one of claims 1 to 7, characterized in that, The compressor includes a housing (10), the bearing carrier member (60) includes a bearing seat portion and a diffuser portion, the bearing carrier member (60) includes a carrier member positioning stop (68) provided at one end of the diffuser portion close to the bearing seat portion, and the carrier member positioning stop (68) cooperates with the housing (10).

13. A refrigerant circulation system, characterized in that, A compressor according to any one of claims 1 to 12.

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