Rotor assembly and compressor

Abstract

Provided in the present application are a rotor assembly and a compressor. The rotor assembly comprises: a rotor comprising a rotating shaft; a bearing comprising a bearing inner ring, a bearing outer ring, and a rolling element arranged between the bearing inner ring and the bearing outer ring, wherein the bearing inner ring is sleeved on a shaft end of the rotating shaft; and an anti-detachment portion, the anti-detachment portion being fixedly connected to the shaft end of the rotating shaft and comprising a main body portion, wherein a first surface and a second surface arranged on a radial outer side of the first surface are provided on the side of the main body portion that faces the shaft end, and the first surface is opposite to and abuts against an end surface of the shaft end, the second surface is opposite to an end surface of the bearing inner ring that faces the anti-detachment portion, and has a preset interval with the end surface of the bearing inner ring, the preset interval being smaller than the maximum axial offset of the bearing inner ring, relative to the bearing outer ring and the rolling element, allowed by the bearing.

Description

Rotor assembly and compressor

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This disclosure is based on and claims priority to a Chinese patent application with application number 202311534663.7, application date November 17, 2023, and invention name “Rotor Assembly and Compressor”. The disclosure content of the Chinese patent application is hereby introduced as a whole into this disclosure. Technical Field

[0003] The present application relates to the technical field of rotating equipment, and in particular to a rotor assembly and a compressor. Background Art

[0004] In some forms of rotating equipment, such as screw compressors, as shown in Figure 1, the bearing 2 that supports the rotation of the rotor 1 of the screw compressor is generally a radial cylindrical rolling bearing. The radial cylindrical rolling bearing includes a bearing inner ring 21, a bearing outer ring 22, rolling elements 23 (cylindrical rollers), and a bearing retainer 24. The radial cylindrical rolling bearing only supports the radial load of the rotor and cannot bear load in the axial direction. The bearing inner ring 21 of the radial cylindrical rolling bearing and the rotating shaft 11 of the rotor assembly usually adopt an interference fit. However, after long-term load-bearing operation, the bearing inner ring 21 will still gradually creep along the axial direction of the rotating shaft 11, and there is a risk of falling off after a certain period of operation.

[0005] To prevent the bearing inner ring 21 from separating from the rotating shaft 11, a shaft circlip 9 is generally used to axially limit the bearing inner ring 21. As shown in Figures 1 and 2, the shaft circlip 9 is embedded in a groove 119 provided on the rotating shaft. The shaft circlip 9 can have some adverse effects on the rotor assembly shaft system.

[0006] The above statements are only used to provide background technical information related to the present application and do not necessarily constitute prior art.

[0007] Summary of the Invention

[0008] The purpose of the present application is to provide a rotor assembly and a compressor, aiming to reduce or eliminate the adverse effects caused by using a shaft elastic retaining ring to axially limit the inner ring of a bearing.

[0009] A first aspect of the present application provides a rotor assembly, comprising:

[0010] a rotor, including a rotating shaft;

[0011] A bearing, comprising a bearing inner ring, a bearing outer ring, and rolling elements disposed between the bearing inner ring and the bearing outer ring, wherein the bearing inner ring is sleeved on an end of the rotating shaft; and

[0012] An anti-slip portion, the anti-slip portion is fixedly connected to the shaft end of the rotating shaft, the anti-slip portion includes a main body, the main body has a first surface on the side facing the shaft end and a second surface arranged radially outward of the first surface, the first surface is opposite to and abuts against the end face of the shaft end, the second surface is opposite to the end face of the bearing inner ring facing the anti-slip portion and has a preset interval with the end face of the bearing inner ring, and the preset interval is smaller than the maximum axial offset of the bearing inner ring relative to the bearing outer ring and the rolling element allowed by the bearing.

[0013] In some embodiments of the rotor assembly, the main body includes a disc and a ring connected to the outer circumference of the disc and protruding from the disc toward the side of the rotating shaft, the first surface is the disc surface of the disc facing the side of the rotating shaft, and the second surface is the annular surface of the ring facing the side of the rotating shaft.

[0014] In some embodiments of the rotor assembly,

[0015] The inner circumference of the ring is clearance-matched with the outer circumference of the rotating shaft.

[0016] In some embodiments of the rotor assembly,

[0017] The diameter of the outer circumference of the second surface is smaller than the diameter of the outer circumference of the bearing inner ring; or

[0018] The diameter of the outer circumference of the second surface is larger than the diameter of the inner circumference of the bearing outer ring.

[0019] In the rotor assembly of some embodiments, a diameter of an outer circumference of the second surface is between a diameter of an inner circumference of the bearing outer ring and a diameter of an outer circumference of the bearing outer ring.

[0020] In the rotor assembly of some embodiments, the shaft end includes a shaft shoulder, and an end surface of the bearing inner ring away from the anti-slip portion abuts against the shaft shoulder.

[0021] In the rotor assembly of some embodiments, the anti-detachment portion is detachably connected to the rotating shaft.

[0022] In some embodiments of the rotor assembly,

[0023] The shaft end has a threaded hole coaxial with the rotating shaft;

[0024] The anti-slip portion includes a threaded rod located on a side of the main body facing the rotating shaft and matched with the threaded hole.

[0025] In the rotor assembly of some embodiments, the threaded rod is coaxially and integrally arranged with the main body.

[0026] In some embodiments of the rotor assembly, the anti-slip portion further includes a screwing portion, which is disposed on a side of the anti-slip portion away from the rotating shaft, and the screwing portion is configured to drive the anti-slip portion to rotate so that the threaded rod enters the threaded hole or exits the threaded hole.

[0027] In the rotor assembly of some embodiments, the screwing portion is integrally provided with the main body portion.

[0028] In some embodiments of the rotor assembly,

[0029] The screwing portion includes a boss protruding from the main body toward a side away from the rotating shaft, and the outer periphery of the boss includes a cylindrical surface surrounded by multiple planes; and / or

[0030] The screwing portion includes a countersink extending along the axial direction of the rotating shaft, and a side wall of the countersink includes a cylindrical surface surrounded by multiple planes.

[0031] In some embodiments of the rotor assembly, the rotor assembly includes a compression unit disposed on the rotating shaft.

[0032] In some embodiments of the rotor assembly, the compression unit includes a screw.

[0033] A second aspect of the present application provides a compressor, comprising the rotor assembly described in the first aspect of the present application.

[0034] Based on the rotor assembly provided by the present application, the problem of the inner ring of the bearing falling off from the rotating shaft is solved by setting an anti-slip portion. At the same time, since the shaft end of the rotating shaft is flat and has no grooves, the problem of increased shaft vibration caused by the weakening of the shaft end due to the grooves is eliminated. Since the anti-slip portion is directly fixed to the shaft end, it is beneficial to arrange the anti-slip portion uniformly in the circumferential direction, thereby facilitating the maintenance of the dynamic balance accuracy of the shaft system of the rotor assembly. Since the second surface of the anti-slip portion is opposite to the end face of the bearing inner ring facing the anti-slip portion and has a preset interval with the end face of the bearing inner ring, the preset interval is less than the maximum axial offset of the bearing inner ring relative to the bearing outer ring and the rolling element allowed by the bearing, so that the bearing inner ring is not subject to a clamping force along the axial direction of the rotating shaft, which is beneficial to meeting the requirements of the rolling bearing for the application characteristics of only limiting and not bearing.

[0035] The compressor of the embodiment of the present application has the same advantages as the rotor assembly of the embodiment of the present application.

[0036] Other features and advantages of the present application will become apparent from the following detailed description of exemplary embodiments of the present application with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0038] FIG1 is a schematic structural diagram of a rotor assembly in the prior art in which a shaft elastic retaining ring is used to limit the inner ring of a bearing.

[0039] FIG2 is a schematic diagram of the matching structure between the elastic retaining ring for the shaft and the rotating shaft in the rotor assembly shown in FIG1 .

[0040] FIG3 is a schematic structural diagram with a partial cross-section of a rotor assembly according to some embodiments of the present application.

[0041] FIG4 is a schematic diagram of a partial structure of the rotor assembly shown in FIG3 , in which the compression unit is not shown.

[0042] FIG5 is a schematic structural diagram of the bearing of the rotor assembly shown in FIG3 , which shows the maximum axial offset allowed by the bearing inner ring relative to the bearing outer ring and the rolling elements.

[0043] FIG6 is a schematic structural diagram of the anti-slip portion of the rotor assembly shown in FIG3 .

[0044] FIG7 is a schematic diagram of the matching structure between the elastic retaining ring for the central shaft and the rotating shaft of the rotor assembly in some other embodiments of the present application. DETAILED DESCRIPTION

[0045] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is in no way intended to limit the present application and its application or use. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0046] Unless otherwise specified, the relative arrangement of the parts and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present application. Meanwhile, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to actual proportional relationships. Technology, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be considered as a part of the specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments can have different values. It should be noted that similar numbers and letters represent similar items in the following drawings, and therefore, once an item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0047] In the description of this application, 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. Unless otherwise stated, the above words have no special meaning and therefore cannot be understood as limiting the scope of protection of this application.

[0048] In the description of this application, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "horizontal, vertical, vertical, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of this application; the directional words "inside and outside" refer to the inside and outside relative to the outline of each component itself.

[0049] In addition, the technical features involved in the different embodiments of the present application described below can be combined with each other as long as they do not conflict with each other.

[0050] As shown in Figures 3 to 6, an embodiment of the present application provides a rotor assembly comprising a rotor 1, a bearing 2, and an anti-slip member 3. The rotor 1 includes a rotating shaft 11. The bearing 2 includes an inner ring 21, an outer ring 22, and rolling elements 23 disposed between the inner ring 21 and the outer ring 22. The inner ring 21 is fitted onto the end of the rotating shaft 11. The anti-slip member 3 is fixedly connected to the end of the rotating shaft 11. The anti-slip member 3 includes a main body 31. The side of the main body 31 facing the shaft end comprises a first surface 3A and a second surface 3B radially outward of the first surface 3A. The first surface 3A faces and abuts against the end face of the shaft end. The second surface 3B faces the end face of the bearing inner ring 21 facing the anti-slip member 3 and has a predetermined spacing S with the end face of the bearing inner ring 21. The predetermined spacing S is less than the maximum axial offset S0 allowed by the bearing 2 for the bearing inner ring 21 relative to the outer ring 22 and rolling elements 23.

[0051] In the related art, as shown in Figures 1 and 2, when a shaft elastic retaining ring 9 is used to prevent the bearing from separating from the rotating shaft, the provision of a groove 119 will cause stress concentration and reduce the minimum shaft diameter of the rotating shaft 11, ultimately weakening the strength of the rotating shaft 11. In particular, when the rotor 1 is used as an active rotor, one side of the bearing 2 is a driving part such as a motor, and the other side is the working section of the rotor, that is, the driven part. At this time, the shaft section of the bearing 11 supported by the bearing 2 needs to withstand a certain torque and radial load at the same time. The strength of the rotating shaft 11 is weakened by the groove 119 that cooperates with the shaft elastic retaining ring 9, which may lead to increased shaft vibration or even broken shaft.

[0052] On the other hand, as shown in FIG2 , the shaft circlip 9 has a loosening hole 91 after installation, and its shape has a significant circumferential imbalance, which adversely affects the dynamic balance accuracy of the shaft system of the rotor assembly.

[0053] Furthermore, the shaft circlip 9 employs an elastic expansion fit, and the width of the groove 119 is typically greater than the thickness of the shaft circlip 9. Therefore, the shaft circlip 9 may experience axial vibration when the rotor 1 rotates. The release hole 91 of the shaft circlip 9 is often higher than the bearing inner ring 21. This higher height of the release hole 91 may also cause the shaft circlip 9 to scratch the bearing retainer 24.

[0054] The rotor assembly of the present embodiment solves the problem of the bearing inner ring 21 falling off the rotating shaft 11 by providing an anti-slip portion 3. Furthermore, since the shaft end of the rotating shaft 11 is flat and groove-free, the problem of increased axial vibration caused by the weakening of the shaft end due to the groove is eliminated. Since the anti-slip portion 3 is directly fixed to the shaft end, the anti-slip portion is evenly arranged in the circumferential direction, thereby facilitating the dynamic balancing accuracy of the rotor assembly's shaft system. Since the second surface 3B of the anti-slip portion 3 opposes the end face of the bearing inner ring 21 facing the anti-slip portion 3 and has a predetermined spacing S with the end face of the bearing inner ring 21, the predetermined spacing S is less than the maximum axial offset S0 of the bearing inner ring 21 relative to the bearing outer ring 22 and rolling elements 23 allowed by the bearing 2. For bearings that only bear radial loads, axial compressive forces would adversely affect their load-bearing performance. Therefore, the predetermined spacing S prevents the bearing inner ring 21 from being subjected to compressive forces axially along the rotating shaft 11, thus meeting the requirements of rolling bearings for position-limiting, non-load-bearing applications.

[0055] As shown in Figures 3 to 7, in some embodiments of the rotor assembly, the main body 31 includes a disk 311 and a ring 312 connected to the outer circumference of the disk 311 and protruding from the disk 311 toward the side of the rotating shaft 11. The first surface 3A is the disk surface of the disk 311 facing the side of the rotating shaft 11, and the second surface 3B is the annular surface of the ring 312 facing the side of the rotating shaft 11.

[0056] The main body 31 is configured as a disk 311 and a ring 312 connected to the outer circumference of the disk 311 and protruding from the disk 311 toward the side of the rotating shaft 11, which helps to evenly arrange the main body 31 along the circumferential direction of the rotating shaft 11, thereby improving the dynamic balancing accuracy of the shaft system of the rotor assembly.

[0057] As shown in Figures 3 to 7, in some embodiments of the rotor assembly, the inner circumferential surface of the ring 312 is clearance-fitted with the outer circumferential surface of the shaft 11.

[0058] The inner circumference of the ring 312 is in clearance fit with the outer circumference of the rotating shaft 11, which is beneficial to the assembly of the main body 31 and the shaft end of the rotating shaft 11, and also beneficial to the positioning of the main body 31 and the shaft end, thereby facilitating the uniform arrangement of the main body 31 along the circumferential direction of the rotating shaft 11, thereby facilitating the improvement of the dynamic balancing accuracy of the shaft system of the rotor assembly.

[0059] As shown in FIG. 3 to FIG. 6 , in the rotor assembly of some embodiments, the diameter of the outer circumference of the second surface 3B is smaller than or equal to the diameter of the outer circumference of the bearing inner ring 21 .

[0060] The diameter of the outer circumference of the second surface 3B is less than or equal to the diameter of the outer circumference of the bearing inner ring 21, so that the anti-slip portion can reduce the size of the anti-slip portion while reasonably limiting the range of movement of the bearing inner ring 21, and reduce the impact of the anti-slip portion on the bearing and rotor assembly related components.

[0061] As shown in FIG. 7 , in the rotor assembly of some embodiments, the diameter of the outer circumference of the second surface 3B is larger than the diameter of the inner circumference of the bearing outer ring 22 .

[0062] The diameter of the outer circumference of the second surface 3B is larger than the diameter of the inner circumference of the bearing outer ring 22. On the basis of achieving the aforementioned preset interval S, on the one hand, it can prevent external impurities from entering the interior of the bearing 2 and causing damage to the bearing 2. On the other hand, it can limit the lubricating grease in the bearing 2 from leaving the bearing 2 too directly. Instead, it will be blocked by the second surface 3B, so that the lubricating grease stays inside the bearing 2 for a longer time, fully lubricating and cooling the bearing.

[0063] As shown in FIG. 7 , in the rotor assembly of some embodiments, the diameter of the outer circumference of the second surface 3B is between the diameter of the inner circumference of the bearing outer ring 22 and the diameter of the outer circumference of the bearing outer ring 22 .

[0064] The diameter of the outer circumference of the second surface 3B is less than or equal to the diameter of the outer circumference of the bearing inner ring 21, so that the anti-slip portion can reduce the size of the anti-slip component 3 while reasonably limiting the range of movement of the bearing inner ring 21 and isolating the outside from the inside of the bearing 2, and reduce the impact of the anti-slip component 3 on the bearing 2 and related components of its rotor assembly.

[0065] The diameter of the outer circumference of the second surface 3B is smaller than the diameter of the outer circumference of the bearing inner ring 21. When the rotor assembly is assembled, the bearing inner ring 21 and the anti-slip portion 3 can be pre-assembled with the rotor 1, and the bearing outer ring 22, rolling elements 23 and bearing retainer 24 can be assembled.

[0066] As shown in FIG. 4 , in the rotor assembly of some embodiments, the shaft end includes a shaft shoulder 112 , and the end surface of the bearing inner ring 21 away from the anti-slip portion 3 abuts against the shaft shoulder 112 .

[0067] The end face of the bearing inner ring 21 away from the anti-slip portion 3 abuts against the shaft shoulder 112, which is beneficial to the axial positioning of the bearing 2 on the one hand, and is beneficial to reasonably reserving a preset interval S during assembly on the other hand, so that the bearing inner ring 21 is not subjected to a clamping force along the axial direction of the rotating shaft 11, which is beneficial to meeting the requirements of the rolling bearing for only limiting and not load-bearing application characteristics.

[0068] As shown in Figures 3 to 7, in some embodiments of the rotor assembly, the anti-slip portion 3 is detachably connected to the rotating shaft 11. The detachable connection between the anti-slip portion 3 and the rotating shaft 11 facilitates disassembly and replacement of the bearing inner ring 21 and the bearing 2 from the rotating shaft 11.

[0069] As shown in Figures 3 to 7, in some embodiments of the rotor assembly, the shaft end has a threaded hole 111 coaxial with the rotating shaft 11; the anti-slip portion 3 includes a threaded rod 32 located on the side of the main body 31 facing the rotating shaft 11 and cooperating with the threaded hole 111.

[0070] This arrangement facilitates the uniform placement of the main body 31 along the circumference of the shaft 11, thereby improving the dynamic balancing accuracy of the rotor assembly's shaft system. The anti-slip portion 3 is pre-tightened by the threads, firmly attached to the shaft 11, preventing the shaft 11 from shaking during rotation due to the installation of the anti-slip portion 3.

[0071] In some embodiments of the rotor assembly, the threaded rod 32 is coaxially integrated with the main body 31. This arrangement facilitates assembly and disassembly of the anti-slip portion 3 and the rotating shaft 11, thereby facilitating assembly and maintenance of the rotor assembly. It also facilitates the uniform arrangement of the main body 31 along the circumference of the rotating shaft 11, thereby improving the dynamic balancing accuracy of the rotor assembly's shaft system.

[0072] In some embodiments of the rotor assembly, the anti-slip portion 3 further includes a screwing portion 33, which is disposed on a side of the anti-slip portion 3 away from the rotating shaft 11. The screwing portion 33 is configured to drive the anti-slip portion 3 to rotate so that the threaded rod 32 enters the threaded hole 111 or exits the threaded hole 111.

[0073] The provision of the screwing portion facilitates the assembly and disassembly of the anti-slip portion 3 and the rotating shaft 11 , thereby facilitating the assembly and maintenance of the rotor assembly.

[0074] In some embodiments of the rotor assembly, the screwing portion 33 is integrally provided with the main body 31. This arrangement facilitates the assembly and disassembly of the anti-slip portion 3 and the rotating shaft 11, thereby facilitating the assembly and maintenance of the rotor assembly.

[0075] For example, in some embodiments of the rotor assembly, the screwing portion 33 includes a boss protruding from the main body 31 toward a side away from the rotating shaft 11, and the outer periphery of the boss includes a cylindrical surface surrounded by multiple planes; and / or the screwing portion 33 includes a countersunk hole extending axially along the rotating shaft 11, and the side wall of the countersunk hole includes a cylindrical surface surrounded by multiple planes.

[0076] The boss can be, for example, an external hexagonal, square, or triangular projection. The countersunk hole can be, for example, an internal hexagonal, square, or triangular projection. Providing the boss simplifies manufacturing, while the thickness of the stopper helps improve the axial load capacity of the bearing. Providing the countersunk hole helps reduce the operating space for installing and removing the anti-slip portion 3.

[0077] As shown in FIG. 3 , in some embodiments of the rotor assembly, the rotor assembly includes a compression unit disposed on a rotating shaft 11 .

[0078] As shown in FIG3 , in some embodiments, the rotor assembly includes a compression unit comprising a screw 12. As shown in FIG3 through FIG7 , in this embodiment, the rotor assembly of the screw compressor utilizes a cylindrical roller bearing 2, wherein the rolling elements 23 are rollers. Cylindrical roller bearings bear only radial loads and are not subject to axial loads or tightening. The outer ring 22, rolling elements 23, and bearing retainer 24 of the bearing are inseparable, while the inner ring 21 of the bearing is independently detachable. This type of bearing allows for an axial misalignment of the inner ring 21 with respect to the other bearing components, i.e., the aforementioned axial offset. The maximum permissible axial misalignment value is the maximum permissible axial offset S0. The anti-slip part 3 abuts against the axial surface of the shaft end and fits tightly, that is, the screw of the anti-slip part 3 cooperates with the thread of the rotating shaft 11 to realize the compression of the first surface 3A of the anti-slip part 3 against the end face of the shaft end without involving the bearing 2. The inner ring 21 of the bearing abuts against the shoulder 112 of the rotating shaft 11 and fits tightly, so that the inner ring 21 of the bearing is not subjected to the clamping force. The preset gap S value between the second surface 3B of the anti-slip part 3 and the inner ring of the bearing is greater than 0 and less than or equal to S0, which meets the requirements of this type of bearing for limiting only and not load-bearing application characteristics.

[0079] The present invention also provides a compressor including the rotor assembly according to the present invention. The rotor assembly includes a compression unit disposed on a rotating shaft 11. The compressor according to the present invention has the same advantages as the rotor assembly according to the present invention.

[0080] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application and are not intended to limit them. Although the present application has been described in detail with reference to preferred embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present application can still be modified or some technical features can be replaced by equivalents, which should all be included in the scope of the technical solutions requested for protection in this application.

Claims

1. A rotor assembly, characterized in that: include: A rotor (1) comprising a rotating shaft (11); A bearing (2), comprising a bearing inner ring (21), a bearing outer ring (22), and a rolling element (23) disposed between the bearing inner ring (21) and the bearing outer ring (22), wherein the bearing inner ring (21) is sleeved on the shaft end of the rotating shaft (11); and An anti-slip component (3), the anti-slip component (3) is fixedly connected to the shaft end of the rotating shaft (11), the anti-slip component (3) comprises a main body (31), the main body (31) has a first surface (3A) on the side facing the shaft end and a second surface (3B) arranged radially outward of the first surface (3A), the first surface (3A) is opposite to and abuts against the end face of the shaft end, the second surface (3B) is opposite to the end face of the bearing inner ring (21) facing the anti-slip component (3) and has a preset interval (S) with the end face of the bearing inner ring (21), and the preset interval (S) is smaller than the maximum axial offset (S0) of the bearing inner ring (21) relative to the bearing outer ring (22) and the rolling element (23) allowed by the bearing (2).

2. The rotor assembly according to claim 1, wherein the main body (31) comprises a disk (311) and a ring (312) connected to the outer circumference of the disk (311) and protruding from the disk (311) toward the side of the rotating shaft (11), the first surface (3A) is the disk surface of the disk (311) facing the side of the rotating shaft (11), and the second surface (3B) is the annular surface of the ring (312) facing the side of the rotating shaft (11).

3. The rotor assembly according to claim 2, wherein the inner circumferential surface of the circular ring (312) is clearance-matched with the outer circumferential surface of the rotating shaft (11).

4. The rotor assembly according to claim 2 or 3, wherein The diameter of the outer circumference of the second surface (3B) is less than or equal to the diameter of the outer circumference of the bearing inner ring (21); or The diameter of the outer circumference of the second surface (3B) is greater than the diameter of the inner circumference of the bearing outer ring (22).

5. The rotor assembly according to claim 4, wherein the diameter of the outer circumference of the second surface (3B) is between the diameter of the inner circumference of the bearing outer ring (22) and the diameter of the outer circumference of the bearing outer ring (22).

6. The rotor assembly according to any one of claims 1 to 5, wherein the shaft end comprises a shaft shoulder (112), and an end surface of the bearing inner ring (21) away from the anti-slip component (3) abuts against the shaft shoulder (112).

7. The rotor assembly according to any one of claims 1 to 6, wherein the anti-slip component (3) is detachably connected to the rotating shaft (11).

8. The rotor assembly of claim 7, wherein The shaft end has a threaded hole (111) coaxial with the rotating shaft (11); The anti-drop component (3) comprises a threaded rod (32) located on a side of the main body (31) facing the rotating shaft (11) and cooperating with the threaded hole (111).

9. The rotor assembly according to claim 8, wherein the threaded rod (32) is coaxially and integrally arranged with the main body (31).

10. A rotor assembly according to claim 8 or 9, wherein the anti-slip component (3) further comprises a screwing portion (33), wherein the screwing portion (33) is disposed on a side of the anti-slip component (3) away from the rotating shaft (11), and wherein the screwing portion (33) is configured to drive the anti-slip component (3) to rotate so that the threaded rod (32) enters the threaded hole (111) or exits from the threaded hole (111).

11. The rotor assembly according to claim 10, wherein the screwing portion (33) is integrally provided with the main body portion (31).

12. A rotor assembly according to claim 10 or 11, wherein The screwing portion (33) comprises a boss protruding from the main body (31) toward a side away from the rotating shaft (11), and the outer periphery of the boss comprises a cylindrical surface surrounded by a plurality of planes; and / or The screwing portion (33) comprises a countersunk hole extending along the axial direction of the rotating shaft (11), and the side wall of the countersunk hole comprises a cylindrical surface surrounded by a plurality of planes.

13. The rotor assembly according to any one of claims 1 to 12, wherein the rotor assembly comprises a compression unit arranged on the rotating shaft (11).

14. The rotor assembly of claim 13, wherein the compression unit comprises a screw (12).

15. A compressor comprising a rotor assembly according to any one of claims 1 to 14.

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