WO2022179133A1

WO2022179133A1 - Rotor assembly, compressor and air conditioner

Info

Publication number: WO2022179133A1
Application number: PCT/CN2021/124636
Authority: WO
Inventors: 刘华; 武晓昆; 张治平; 龙忠铿; 唐晗
Original assignee: 珠海格力电器股份有限公司
Priority date: 2021-02-26
Filing date: 2021-10-19
Publication date: 2022-09-01
Also published as: CN112780560A

Abstract

The present disclosure provides a rotor assembly (100), comprising: a first shaft (111), a second shaft (121), a first rotor portion (112) and a second rotor portion (122); the first rotor portion (112) is arranged on the first shaft (111), the second rotor portion (122) is arranged on the second shaft (121), the second rotor portion (122) and the first rotor portion (112) are engaged with each other, and the first rotor portion (112) is configured to rotate along with the first shaft (111), so as to drive the second rotor portion (122) to rotate around the second shaft (121). In the present disclosure, the second rotor portion is connected to the second shaft in a rolling manner, so that rolling friction is formed between the second rotor portion and the second shaft during operation, thereby reducing the amount of lubricating oil required, and increasing the efficiency of separation of lubricating oil. In addition, the rotor assembly does not need external stable oil supply during startup, and thus an oil pump or a complex oil sac structure does not need to be additionally configured for a compressor, so that the compressor has a simpler and more compact structure.

Description

Rotor assemblies, compressors and air conditioners

CROSS-REFERENCE TO RELATED APPLICATIONS

The present disclosure is based on, and claims priority to, the CN application number 202110220612.1 with the filing date of February 26, 2021, the disclosure of which is hereby incorporated into the present disclosure as a whole.

technical field

The present disclosure relates to the technical field of fluid machinery, in particular to a rotor assembly, a compressor and an air conditioner.

Background technique

Due to its compactness, high efficiency, reliable performance and strong adaptability, screw compressors are widely used in aerodynamics, refrigeration and air conditioning and various technological processes, and their market share continues to expand.

In recent years, with the development of technology, multi-rotor screw compressors have gradually been paid attention to by researchers. In the existing multi-rotor screw compressor, the sliding bearing is used to connect the female rotor and the female rotating shaft, which has the following shortcomings: (1) The demand for lubricating oil of the sliding bearing is relatively high, and the circulation amount of the lubricating oil in the system is large, resulting in The cost of the unit and the load of the oil separator increase; (2) In order to ensure the reliability of the sliding bearing during the startup process of the sliding bearing, the lubricating oil needs to be circulated in advance. The oil pump adds additional cost.

SUMMARY OF THE INVENTION

The present disclosure provides a rotor assembly, a compressor and an air conditioner, so as to solve the technical problem that the existing rotor assembly requires a large amount of lubricating oil circulation during operation, which leads to complex structural design of the compressor.

In one aspect, a rotor assembly includes: a first shaft, a second shaft, a first rotor portion, and a second rotor portion; wherein the first rotor portion is disposed on the first shaft, the second rotor A portion is provided on the second shaft, the second rotor portion is intermeshed with the first rotor portion, the first rotor portion is configured to rotate with the first shaft to drive the second rotor The part rotates about the second axis.

In some embodiments, at least one first rolling connection is provided between the second rotor part and the second shaft for rotating the second rotor part relative to the second shaft.

In some embodiments, the second rotor part and/or the second shaft is provided with a limit part, and the limit part cooperates with the first rolling connection to locate the second rotor part in the position on the second axis.

In some embodiments, the second rotor part is provided with a first groove, the second shaft is provided with a second groove opposite the first groove, and the first rolling connection is at least partially It is embedded in the space formed by the first groove and the second groove.

In some embodiments, the at least one of the first rolling connections is at least one of a rolling bearing, a ball and a roller.

In some embodiments, at least one of the first rolling connections is a rolling bearing, and the rolling bearing includes an inner ring and an outer ring that can rotate relative to each other;

the second rotor portion is integrally formed with the outer ring; and/or

The second shaft is integrally formed with the inner ring.

In some embodiments, the number of the first rolling connection is one, and the first rolling connection is arranged at the axial center position of the second rotor part; or

The number of the first rolling connections is multiple, and they are equally spaced along the axial direction of the second rotor part.

In some embodiments, the first rotor further includes a third rotor part, the third rotor part is opposite to the thread direction of the first rotor part, and is disposed on the first shaft; the third rotor part is arranged on the first shaft; The second rotor further includes a fourth rotor part, the fourth rotor part is arranged on the second shaft and meshes with the third rotor part; the third rotor part is used to rotate with the first shaft to drive the fourth rotor part to rotate around the second shaft.

In some embodiments, at least one second rolling connection is provided between the fourth rotor part and the second shaft for rotating the fourth rotor part relative to the second shaft.

In some embodiments, the first rotor portion and the third rotor portion are arranged symmetrically; and/or

The second rotor part and the fourth rotor part are arranged symmetrically.

In some embodiments, the first rotor portion and the third rotor portion are symmetrically arranged, the second rotor portion and the fourth rotor portion are arranged symmetrically, and the first rolling connection member and the second rotor portion are arranged symmetrically. The rolling connections are arranged symmetrically.

In some embodiments, the first rotor portion and the first shaft are integral structures.

Another aspect of the present disclosure provides a compressor including the rotor assembly.

Yet another aspect of the present disclosure provides an air conditioner, including the compressor.

The inventors believe that the present disclosure has the following advantages:

In the rotor assembly, compressor and air conditioner provided by the present disclosure, rolling friction is formed between the second rotor part and the second shaft during operation by rotatably connecting the second rotor part and the second shaft Thus, the required amount of lubricating oil is reduced, and the separation efficiency of lubricating oil is improved. In addition, the rotor assembly does not require external stable oil supply during the startup process, so there is no need to configure an additional oil pump or complex oil bladder structure for the compressor, making the compressor structure simpler and more compact.

Description of drawings

In order to illustrate the technical solutions in the embodiments of the present disclosure more clearly, the following briefly introduces the accompanying drawings used in the description of the embodiments. Obviously, the accompanying drawings in the following description are only some embodiments of the present disclosure. For those skilled in the art, other drawings can also be obtained from these drawings without creative effort.

1 is a central cross-sectional view of an embodiment of a rotor assembly provided by an embodiment of the present disclosure;

Fig. 2 is a partial enlarged view at B in Fig. 1;

3 is a central cross-sectional view of another embodiment of a rotor assembly provided in embodiments of the present disclosure;

Fig. 4 is a schematic diagram of partial enlargement at D in Fig. 3;

5 is a schematic diagram of disassembly and assembly of the rotor assembly provided in the embodiment of the present disclosure;

Fig. 6 is another schematic diagram of partial enlargement at D in Fig. 3;

List of reference numerals:

Rotor assembly 100; first shaft 111; first rotor part 112; third rotor part 113; second shaft 121; second groove 1211; second rotor part 122; first groove 1221; fourth rotor part 123; Limiting part 124 ; first rolling connection piece 130 , outer ring 131 ; inner ring 132 ; second rolling connection piece 140 .

Detailed ways

The technical solutions in the embodiments of the present disclosure will be clearly and completely described below with reference to 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, but not all of the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by those skilled in the art without creative efforts shall fall within the protection scope of the present disclosure.

In the description of the present disclosure, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", " The orientation or positional relationship indicated by "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. is based on the orientation shown in the drawings Or the positional relationship is only for the convenience of describing the present disclosure and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present disclosure. In addition, the terms "first" and "second" are only used for descriptive purposes, and should not be construed as indicating or implying relative importance or implying the number of indicated technical features. Thus, features defined as "first", "second" may expressly or implicitly include one or more of said features. In the description of the present disclosure, "plurality" means two or more, unless expressly and specifically defined otherwise.

In this disclosure, the word "exemplary" is used to mean "serving as an example, illustration, or illustration." Any embodiment described in this disclosure as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments. The following description is presented to enable any person skilled in the art to make and use the present disclosure. In the following description, details are set forth for the purpose of explanation. It should be understood that one of ordinary skill in the art may realize that the present disclosure may be practiced without the use of these specific details. In other instances, well-known structures and procedures have not been described in detail so as not to obscure the description of the present disclosure with unnecessary detail. Thus, the present disclosure is not intended to be limited to the embodiments shown but is to be accorded the widest scope consistent with the principles and features disclosed in this disclosure.

The present disclosure is further described in conjunction with the following examples.

Referring to FIG. 1 , a rotor assembly 100 provided by an embodiment of the present disclosure includes a first shaft 111 , a second shaft 121 , a first rotor part 112 , and a second rotor part 122 . The first rotor part 112 is provided on the first shaft 111 , and the second rotor part 122 is provided on the second shaft 121 . The second rotor part 122 and the first rotor part 112 are engaged with each other, and the first rotor part 112 is configured to rotate with the first shaft 111 to drive the second rotor part 112 to rotate around the second shaft 121 .

It can be understood that, in the embodiment of the present disclosure, the second rotor part 122 is rotatably connected with the second shaft 121 , so that a formation is formed between the second rotor part 122 and the second shaft 121 during operation. Rotational friction thus reduces the amount of lubricating oil required and improves the separation efficiency of lubricating oil. In addition, the rotor assembly 100 does not require external stable oil supply during the startup process, so there is no need to configure an additional oil pump or a complex oil bag structure, which is beneficial to make the structure of the compressor with the rotor assembly 100 simpler and more compact.

In some embodiments, the rotor assembly 100 further includes a third rotor portion 113 , the third rotor portion 113 and the first rotor portion 112 have opposite screw threads, and the third rotor portion 113 is opposite to the first rotor portion 112 . The rotor part 112 is coaxially disposed on the first shaft 111 . The rotor assembly 100 further includes a fourth rotor part 123 , the fourth rotor part 123 is arranged on the second shaft 121 and is intermeshed with the third rotor part; the third rotor part 113 is used to follow the The first shaft 111 is rotated to drive the fourth rotor part 123 to rotate around the second shaft 121 .

FIG. 5 is a schematic diagram of disassembly and assembly of the rotor assembly provided in the embodiment of the present disclosure. In this embodiment, the first rotor portion 112 and the first shaft 111 are integral structures, the third rotor portion 113 is provided with a shaft hole (not shown in the figure), and the first shaft 111 is penetrated through the In the shaft hole, the third rotor part 113 is sleeved on the first shaft 111 . It can be understood that the arrangement of the first rotor part 112 and the first shaft 111 in one piece is beneficial to improve the connection strength between the first rotor part 112 and the first shaft 111 on the one hand, and avoid installation errors on the other hand. In other embodiments of the present disclosure, the third rotor part 113 and the first shaft 111 are integral structures; alternatively, the first rotor part 112 , the third rotor part 113 and the first shaft 111 It is a one-piece structure, which is not limited here.

In some embodiments, the first rotor part 112 is keyed with the third rotor part 113 to transmit torque.

In other embodiments, in order to facilitate maintenance and replacement of components, the first rotor part 112 is connected with the first shaft 111 by a key. In other embodiments, the first rotor part 112 and/or the third rotor part 113 may also be threadedly connected to the first shaft 111, which is not limited herein.

In some embodiments, the end faces of the third rotor portion 113 and the first rotor portion 112 that are close to each other have the same line shape, and the end faces that are close to each other are combined.

In some embodiments, the third rotor part 113 and the first rotor part 112 are arranged symmetrically.

In some embodiments, during the rotation of the first rotor part 112 and the third rotor part 113 , because the helical directions of the first rotor part 112 and the third rotor part 113 are opposite, and the The first rotor portion 112 and the third rotor portion 113 are symmetrically arranged, and opposite axial flows are formed between the first rotor portion 112 and the third rotor portion 113, so that the first rotor portion 113 The axial thrusts on 112 and the third rotor part 113 can substantially cancel each other, which is beneficial to reduce or eliminate the need for thrust bearings and reduce the volume of the equipment. One possible implementation is that the first shaft 111 can be connected to a drive motor (not shown in the figure), the drive motor drives the first shaft 111 to rotate, and the first shaft 111 drives the first rotor The part 112 and the third rotor part 113 rotate.

In some embodiments, the second shaft 121 is arranged in parallel with the first shaft 111 , and the second rotor part 122 and the fourth rotor part 123 are both provided with shaft holes in the axial direction (not shown in the figure). shown), the second shaft 121 passes through the shaft holes of the second rotor part 122 and the fourth rotor part 123 so that the second rotor part 122 and the fourth rotor part 123 are sleeved on the second shaft 121 . The first rotor part 112 and the second rotor part 122 are meshed with each other, and the third rotor part 113 and the fourth rotor part 123 are meshed with each other.

It can be understood that since the helical directions of the first rotor part 112 and the third rotor part 113 are opposite, the first rotor part 112 and the second rotor part 122 are engaged with each other, and the third rotor part The first rotor part 112 drives the second rotor part 122 to rotate around the second shaft 121 along the second axis, and the third rotor part 113 drives The fourth rotor portion 123 rotates along the second axis around the second shaft 121 , the helical directions of the second rotor portion 122 and the fourth rotor portion 123 are opposite, and the first rotor portion 112 drives The second rotor part 122 rotates in the opposite direction, and the third rotor part 113 drives the fourth rotor part 123 to rotate in the opposite direction, so that the rotor assembly 100 works normally.

Referring to FIG. 1 and FIG. 2 , in the embodiment of the present disclosure, between the second rotor part 122 and the second shaft 121 is provided a mechanism for rotating the second rotor part 122 relative to the second shaft 121 At least one first rolling link 130 .

Specifically, the diameter of the through hole on the second rotor part 122 is larger than the diameter of the second shaft 121 , and a first roller is provided between the inner wall of the second rotor part 122 and the second shaft 121 . Connector 130 . It can be understood that, arranging the first rolling connection member 130 between the second rotor part 122 and the second shaft 121 is beneficial to reduce the volume of the second rotor 120 while the first rolling The connecting piece 130 can provide higher radial positioning accuracy, thereby helping to improve the meshing accuracy of the second rotor portion 122 and the first rotor portion 112, thereby improving the transmission accuracy, reducing leakage loss, and helping to reduce volume, Reduce noise and improve compressor energy efficiency.

In some embodiments, at least one of the first rolling connections 130 is at least one of rolling bearings, balls and rollers. It should be noted that the first rolling connection member 130 may be any type of rolling bearing such as a needle roller bearing, a roller bearing, and a ball bearing.

In some embodiments, as shown in FIG. 6 , at least one of the first rolling connections 130 is a rolling bearing, and the rolling bearing includes an inner ring 132 and an outer ring 131 that can rotate relative to each other; the second rotor part 122 is connected to the The outer ring 131 is integrally formed; and/or the second shaft 121 and the inner ring 132 are integrally formed. It should be noted that, the second rotor portion 122 and the outer ring 131 may be integrally formed by the second rotor portion 122 being integrally formed on the outer ring 131 , or the outer ring 131 may be integrally formed on the outer ring 131 . on the second rotor part 122 . The second shaft 121 and the inner ring 132 may be integrally formed by the second shaft 121 being integrally formed on the inner ring 132 , or the inner ring 132 may be integrally formed on the second shaft 121 . It should be emphasized that the integral molding of the second rotor part 122 and the outer ring 131 can increase the connection strength between the second rotor part 122 and the first rolling connection member 130 , and can effectively avoid the second rotor part 122 The rotor portion 122 and the first rolling connection member 130 move relative to each other, which is beneficial to improve the assembly efficiency and accuracy at the same time. In some embodiments, the second shaft 121 and the inner ring 132 are integrally formed, which can increase the connection strength between the second shaft 121 and the first rolling connection member 130 and can effectively avoid the second shaft 121 . 122 and the first rolling connection member 130 are relatively moved, so as to locate the position of the second rotor part 122 on the second shaft 121, which is beneficial to avoid the second rotor part 122 and the third rotor The parts 113 interfere with each other, which is beneficial to improve the stability of the rotor assembly 100 .

In some embodiments, the first rolling connection 130 is a cylindrical roller bearing. Since the cylindrical roller can bear axial force in addition to radial force, the movement of the second rotor part 122 along the axial direction of the second shaft 121 can be restricted during operation, which is beneficial to avoid the The second rotor part 122 and the third rotor part 113 interfere with each other, which is beneficial to improve the stability of the rotor assembly 100 .

Referring to FIG. 3 and FIG. 4 , in other embodiments, the second rotor part 122 and/or the second shaft 121 is provided with a limiting part 124 , and the limiting part 124 and the first rolling The connecting piece 130 cooperates to locate the position of the second rotor part 122 on the second shaft 121 . The limiting portion 124 may be provided on the second shaft 121 , on the second rotor portion 122 , or on both the second rotor portion 122 and the second shaft 121 . . In some embodiments, the limiting portion 124 may be a boss, a groove, a friction portion, etc., which is not limited herein.

It can be understood that the second rotor portion 122 and/or the second shaft 121 is provided with a limiting portion 124, such as a groove, and the first rolling connection member 130 is fixed in the groove, thereby positioning the position of the second rotor part 122 on the second shaft 121 . It should be emphasized that the positioning of the second rotor portion 122 on the second shaft 121 by the limiting portion 124 in the rotor assembly is beneficial to prevent mutual interference between the second rotor portion 122 and the third rotor portion 113 , thereby reducing the arrangement of spacers, thereby reducing the volume of the rotor assembly 100 and making the structure of the rotor assembly 100 more compact.

Specifically, a first groove 1221 is provided thereon along the radial direction of the second rotor portion 122 , and a first groove 1221 is provided thereon along the radial direction of the second shaft 121 . The oppositely arranged second grooves 1211, the first rolling connection piece 130 is embedded in the accommodating space formed by the first groove 1221 and the second groove 1211, and the first rolling connection piece 130 can be in the first groove 1211. The groove 1221 and the second groove 1211 rotate inside. In some embodiments, when the first rolling connection member 130 is a ball, the ball is partially embedded in the first groove 1221 and partially embedded in the second groove 1211 to position the second rotor portion 122 position on the second axis 121 . The above structural design is beneficial to further simplify the structure of the rotor assembly 100 because the inner ring 132 and the outer ring 131 of the rolling bearing are omitted, and the position of the second rotor part 122 on the second shaft 121 can be positioned. In other embodiments of the present disclosure, the balls may also be rollers, and the rollers, the second rotor part 122 and the second shaft 121 have the same matching structures as the balls, and achieve the same effect here. Repeat.

Referring to FIGS. 1 and 2 , in the embodiment of the present disclosure, a first rolling connection member 130 is disposed between the second rotor portion 122 and the second shaft 121 , and one first rolling connection member 130 is provided. It is located at the axial center position of the second rotor part 122 .

In some embodiments, a plurality of first rolling connections 130 may also be disposed between the second rotor part 122 and the second shaft 121 , and the plurality of first rolling connections 130 are distributed at equal distances in the axial direction, The plurality of first rolling connections 130 may be the same or different. For example, three first rolling connections 130 are provided between the second rotor part 122 and the second shaft 121 , and two of the first rolling connections 130 are provided with the second rotor part 122 At both ends of the second rotor part 122 , the other is arranged at the axial center position of the second rotor part 122 .

Of course, in other embodiments, the second rotor part 122 can also be rotatably connected to the second shaft 121 in other ways, for example, the second rotor part 122 or the second shaft 121 is provided on the second rotor part 122 . The rolling part is not limited here.

In some embodiments of the present disclosure, a second rolling connection 140 is provided between the fourth rotor part 123 and the second shaft 121 , and the second rolling connection 140 is configured to make the fourth rotor The portion 123 rotates relative to the second shaft 121 . Further, the first rolling connection member 130 and the second rolling connection member 140 are symmetrically arranged, which is beneficial to improve the stability of the second rotor 120 . The fourth rotor portion 123 is rotatably connected to the second shaft 121, so that rolling friction is formed between the fourth rotor portion 123 and the second shaft 121 during operation, thereby reducing the required amount of lubricating oil, The separation efficiency of lubricating oil is improved. In addition, the rotor assembly does not require external stable oil supply during the startup process, so there is no need to configure an additional oil pump or complex oil bladder structure for the compressor, making the compressor structure simpler and more compact.

In some embodiments, the fourth rotor part 123 and the second rotor part 122 are symmetrically arranged. Since the helical directions of the fourth rotor part 123 and the second rotor part 122 are opposite, the end faces of the fourth rotor part 113 and the second rotor part 112 close to each other have the same line shape, The end faces are combined, and the first rotor part 112 and the third rotor part 113 are symmetrically arranged, so that opposite axial flows are formed between the first rotor part 112 and the third rotor part 113, so that all the The axial thrusts on the first rotor part 112 and the third rotor part 113 can substantially cancel each other, which is beneficial to reduce or eliminate the need for thrust bearings and reduce the volume of the equipment.

It should be noted that the second rolling connection member 140 has the same structure and features as the first rolling connection member 130 in the above-mentioned embodiments, and achieves the same or similar functions, which will not be repeated here. In the same embodiment, the second rolling connection member 140 and the first rolling connection member 130 may be the same or different, which is not limited herein.

The compressor provided in the embodiment of the present disclosure includes the above-mentioned rotor assembly. In this embodiment, the structure of the rotor assembly is the same as that of the rotor assembly in the above-mentioned embodiments, and has the same function, which will not be repeated here.

The air conditioner provided in the embodiment of the present disclosure includes the above-mentioned compressor. In this embodiment, the structure of the rotor assembly included in the compressor is the same as that of the rotor assembly in the above-mentioned embodiments, and has the same function, which will not be repeated here.

A rotor assembly, a compressor and an air conditioner provided by the embodiments of the present disclosure have been described in detail above. The principles and implementations of the present disclosure are described by using specific examples herein. The descriptions of the above embodiments are only used to help Understand the method of the present disclosure and its core idea; meanwhile, for those skilled in the art, according to the idea of the present disclosure, there will be changes in the specific implementation and application scope. In summary, the content of this specification should not be understood as a limitation of the present disclosure.

Claims

A rotor assembly (100), comprising: a first shaft (111), a second shaft (121), a first rotor part (112), and a second rotor part (122); wherein the first rotor part (112) ) is arranged on the first shaft (111), the second rotor part (122) is arranged on the second shaft (121), and the second rotor part (122) is connected to the first rotor part (112) meshing with each other, the first rotor part (112) is configured to rotate together with the first shaft (111) to drive the second rotor part (122) to rotate about the second shaft (121) .
The rotor assembly (100) according to claim 1, wherein between the second rotor part (122) and the second shaft (121), there is provided between the second rotor part (122) and the second rotor part (122) relative to the second rotor part (122) At least one first rolling link (130) for the rotation of the two shafts (121).
The rotor assembly (100) according to claim 2, wherein a limiting portion (124) is provided on the second rotor portion (122) and/or the second shaft (121), and the limiting portion (124) ) cooperates with the first rolling link (130) to locate the position of the second rotor part (122) on the second shaft (121).
The rotor assembly (100) according to claim 2 or 3, wherein the second rotor part (122) is provided with a first groove (1221), and the second shaft (121) is provided with the first groove (1221) The groove (1221) faces the provided second groove (1211), and the first rolling connection member (130) is at least partially located in the space formed by the first groove (1221) and the second groove (1211) Inside.
The rotor assembly (100) of any one of claims 2 to 4, wherein at least one of the first rolling connections (130) is at least one of a rolling bearing, a ball and a roller.
The rotor assembly (100) according to any one of claims 2 to 5, wherein at least one of the first rolling connections (130) is a rolling bearing, and the rolling bearing includes an inner ring (132) and an outer ring capable of relative rotation (131);

The second rotor part (122) is integrally formed with the outer ring (131); and/or

The second shaft (121) is integrally formed with the inner ring (131).
The rotor assembly (100) according to any one of claims 2 to 6, wherein the number of the first rolling connection member (130) is one, and is disposed on the axial direction of the second rotor portion (122). central location; or

The number of the first rolling connections (130) is multiple, and they are distributed at equal intervals along the axial direction of the second rotor part (122).
The rotor assembly (100) of any one of claims 1 to 7, further comprising:

A third rotor portion (113) is disposed on the first shaft (111), and the third rotor portion (113) and the first rotor portion (112) have opposite screw threads;

a fourth rotor part (123), the fourth rotor part (123) is arranged on the second shaft (121), and meshes with the third rotor part (113);

The third rotor part (113) is used to rotate with the first shaft (111) to drive the fourth rotor part (123) to roll around the second shaft (121).
The rotor assembly (100) according to claim 8, wherein between the fourth rotor part (123) and the second shaft (121), there is provided the fourth rotor part (123) relative to the second shaft (121) At least one second rolling link (140) on which the two shafts (121) roll.
The rotor assembly (100) of claim 8 or 9, wherein the first rotor portion (112) and the third rotor portion (113) are symmetrically arranged; and/or

The second rotor part (122) and the fourth rotor part (123) are symmetrically arranged.
The rotor assembly (100) according to any one of claims 8-10, wherein the first rotor part (112) and the third rotor part (113) are symmetrically arranged, and the second rotor part (122) ) and the fourth rotor part (123) are symmetrically arranged, and the first rolling connection piece (130) and the second rolling connection piece (140) are arranged symmetrically.
The rotor assembly (100) according to any one of claims 1-11, wherein the first rotor portion (112) and the first shaft (111) are of a one-piece structure.
A compressor comprising the rotor assembly (100) of any one of claims 1 to 12.
An air conditioner comprising the compressor of claim 13 .