CN112780555A

CN112780555A - Rotor subassembly, compressor and air conditioner

Info

Publication number: CN112780555A
Application number: CN202110219958.XA
Authority: CN
Inventors: 谭建明; 刘华; 张治平; 武晓昆
Original assignee: Gree Electric Appliances Inc of Zhuhai
Current assignee: Gree Electric Appliances Inc of Zhuhai
Priority date: 2021-02-26
Filing date: 2021-02-26
Publication date: 2021-05-11
Also published as: WO2022179135A1

Abstract

The invention discloses a rotor assembly, a compressor and an air conditioner. The rotor assembly comprises a first rotor and a first shaft body, and the first shaft body bears the first rotor; the first rotor is connected with the first shaft body in a sliding mode, so that the first rotor rotates on the first shaft body in a sliding mode around the first shaft body. The invention can reduce the installation space of the rotor assembly, and the structure of the rotor assembly is more compact.

Description

Rotor subassembly, compressor and air conditioner

Technical Field

The application relates to the technical field of compressors, in particular to a rotor assembly, a compressor and an air conditioner.

Background

The compressor is generally arranged with a pair of parallel screw rotors placed in the spatial volume of the casing of the screw compressor. The space volume of the pair of screw rotors is periodically increased and decreased during the rotation process, so that the space volume is periodically communicated with and closed off the air inlet and the air outlet, and the processes of air suction, compression and air exhaust can be completed.

The female rotor of tradition spiral is generally connected to the pivot through the connecting piece, when the female rotor of male rotor drive rotated, female pivot drives female pivot is together rotated, in order to make female pivot can rotate, need set up the bearing at the both ends of pivot, in order to play the support pivot, reduce the pivot and rotate the effects such as axial force and the radial force that the in-process rotor received at the frictional force of in-process and balanced rotation, if use antifriction bearing with balanced radial force, use ball bearing with balanced axial force, but the use of bearing can increase the arrangement space, and then required volume is great when making the rotor subassembly installation.

Disclosure of Invention

The invention aims to provide a rotor assembly, a compressor and an air conditioner, which can reduce the installation space of the rotor assembly and enable the structure of the rotor assembly to be more compact.

The embodiment of the present application provides a rotor assembly, it includes:

a first rotor;

a first shaft body carrying the first rotor;

the first rotor is connected with the first shaft body in a sliding mode, so that the first rotor rotates on the first shaft body in a sliding mode around the first shaft body.

In an alternative embodiment of the present invention, at least one sliding connection is provided between the inner surface of the first rotor and the outer surface of the first shaft to allow the first rotor to rotate in a sliding manner relative to the first shaft.

In an alternative embodiment of the present invention, the sliding connector is a bearing shell.

In an alternative embodiment of the invention, a lubricant is provided between the sliding connection and the first rotor and/or between the sliding connection and the first shaft body.

In an alternative embodiment of the present invention, the first rotor is made of a non-metal material and/or the first shaft body is made of a non-metal material.

In an optional embodiment of the present invention, one of the first rotor and the first shaft body is made of a non-metallic material, and the other is made of a metallic material.

In an alternative embodiment of the invention, the non-metallic material has self-lubricating properties.

In an alternative embodiment of the present invention, a lubricant is provided in a gap between the inner surface of the first rotor and the outer surface of the first shaft.

In an optional embodiment of the present invention, a lubricant is provided between an inner surface of the first rotor and an outer surface of the first shaft body.

In an alternative embodiment of the present invention, the rotor assembly further comprises:

a second rotor meshed with the first rotor; and

a second shaft carrying the second rotor;

wherein the second rotor is rotatable together with the second shaft body along an axis of the second shaft body.

In an optional embodiment of the present invention, at least one of the second rotor and the first rotor is made of a self-lubricating non-metallic material.

In an alternative embodiment of the present invention, the first rotor includes a first portion and a second portion coaxially disposed on the first shaft, the first portion and the second portion having opposite threads; and the second rotor comprises a third part and a fourth part which are coaxially arranged on the second shaft body, the third part is meshed with the first part, and the fourth part is meshed with the second part.

In an optional embodiment of the present invention, at least one sliding connection is disposed between the inner surface of the first portion and the outer surface of the first shaft, and at least one sliding connection is disposed between the inner surface of the second portion and the outer surface of the first shaft.

In an alternative embodiment of the invention, the third or fourth portion of the second rotor is integrally formed with the second shaft body.

Embodiments of the present invention also provide a compressor including a rotor assembly as described in any one of the above.

The embodiment of the invention also provides an air conditioner which comprises the compressor.

According to the embodiment of the invention, the first rotor is connected with the first shaft body in a sliding manner, so that the first rotor rotates on the first shaft body in a sliding manner around the first shaft body, the first shaft body does not need to rotate, radial force bearings do not need to be arranged at two ends of the first shaft body, the installation space of the rotor assembly can be reduced, and the structure is more compact.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings used in the description of the embodiments will be briefly introduced below. It is obvious that the drawings in the following description are only some embodiments of the application, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.

For a more complete understanding of the present application and its advantages, reference is now made to the following descriptions taken in conjunction with the accompanying drawings, wherein like reference numerals represent like parts in the following description.

FIG. 1 is a schematic cross-sectional view of a rotor assembly according to an embodiment of the present invention;

FIG. 2 is an enlarged view of the first rotor and the first shaft body of FIG. 1;

FIG. 3 is a cross-sectional schematic view of a rotor assembly according to another embodiment of the present invention;

fig. 4 is an enlarged view of the first rotor and the first shaft body in fig. 3.

Description of reference numerals:

100. a rotor assembly;

20. a first rotor; 21. a first portion; 211. a first helical blade; 22. a second portion; 221. a second helical blade; 23. an oil storage tank; 24. an oil outlet hole;

30. a first shaft body; 31. an oil supply passage; 32. an oil supply hole; 33. an axis of the first shaft body; 34. a first end portion; 35. a second end portion; 36. a groove;

40. a gap;

50. a second rotor; 51. a third portion; 511. a third helical blade; 52. a fourth part; 521. a fourth helical blade;

60. a second shaft body; 61. an axis of the second shaft; 62. a third end portion; 63. a fourth end portion;

70. a sliding connection.

Detailed Description

The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses, but rather, any other embodiment obtained by those skilled in the art without making any inventive changes in the invention or the claims.

Reference herein to "an embodiment" or "an implementation" means that a particular feature, structure, or characteristic described in connection with the embodiment or implementation can be included in at least one embodiment of the invention. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.

It should be noted that the terms "first", "second", and the like in the description and claims of the present invention and in the drawings are used for distinguishing different objects and not for describing a particular order. Furthermore, the terms "include" and "have," as well as any variations thereof, are intended to cover non-exclusive inclusions. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

Embodiments of the present invention provide a rotor assembly 100. The rotor assembly 100 may be used in a compressor, an air conditioner, and the like. Please refer to fig. 1 to 4. The rotor assembly 100 includes a first rotor 20 and a first shaft 30.

The first shaft body 30 is used for carrying the first rotor 20. The first rotor 20 is slidably connected to the first shaft 30, so that the first rotor 20 slidably rotates on the first shaft 30 around the first shaft 30. The first shaft 30 is preferably a fixed shaft, i.e., the first shaft 30 is fixed at both ends and does not rotate.

In the embodiment of the present invention, the first rotor 20 and the first shaft 30 are slidably connected, so that sliding friction is formed between the first rotor 20 and the first shaft 30, and when the first rotor 20 rotates, two ends of the first shaft 30 can be directly fixed without rotating, so that radial force bearings are not required to be arranged at two ends of the first shaft 30, and thus, the installation space of the rotor assembly 100 is reduced, and the structure is more compact.

The first rotor 20 is a female rotor, and the first rotor 20 as a female rotor can be understood as a driven rotor. The first rotor 20 has spiral lobes on its outer surface. The first rotor 20 is provided with a shaft hole matched with the first shaft 30, and the first rotor 20 is sleeved on the first shaft 30 through the shaft hole.

With continued reference to fig. 1-4, the rotor assembly 100 further includes a second rotor 50 and a second shaft 60.

The second shaft 60 is used for carrying the second rotor 50.

The second rotor 50 is a male rotor, and the second rotor 50 as a male rotor can be understood as a driving rotor. The outer surface of the second rotor 50 has spiral blades. The second rotor 50 is provided with a shaft hole matched with the second shaft body 60, and the second rotor 50 is sleeved on the second shaft body 60 through the shaft hole. The second rotor 50 is rotatable together with the second shaft body 60 along an axis 61 of the second shaft body. For example, the second rotor 50 may be drivingly connected to and driven for rotation by a drive assembly, such as an electric motor (including but not limited to a permanent magnet motor), and the second rotor 50 rotates while driving the first rotor 20 in rotation via meshing engagement.

In an alternative embodiment of the present invention, the second shaft 60 is parallel to the first shaft 30, and the axis 61 of the second shaft is parallel to the axis 33 of the first shaft.

In this embodiment, the rotor assembly 100 may have a two-rotor structure or a four-rotor structure. When the rotor assembly 100 is a four-rotor structure, the first rotor 20 includes a first portion 21 and a second portion 22 coaxially disposed on the first shaft 30, and the thread directions of the first portion 21 and the second portion 22 are opposite; and the second rotor 50 comprises a third part 51 and a fourth part 52 coaxially arranged on the second shaft body 60, wherein the third part 51 is meshed with the first part 21, and the fourth part 52 is meshed with the second part 22.

Exemplarily, referring to fig. 1 to 4, the first rotor 20 includes the first portion 21 and the second portion 22, the first portion 21 is a hollow cylindrical member, and an outer surface thereof has a first spiral blade 211; the second part 22 is a hollow cylindrical member, and the outer surface thereof is provided with a second spiral blade 221; the thread directions of the first spiral blade 211 and the second spiral blade 221 are opposite, namely the thread directions of the first part 21 and the second part 22 are opposite; the number of the first spiral blades 211 is at least two, and the number of the second spiral blades 221 is at least two. The first shaft body 30 carries the first and

second portions

21, 22 of the first rotor 20; the first shaft body 30 has a first end 34 and a second end 35, the first portion 21 and the second portion 22 of the first rotor 20 being confined between the first end 34 and the second end 35; the first portion 21 and the second portion 22 are rotatable on the first shaft body 30 about the first shaft body 30 along an axis 33 of the first shaft body.

For example, referring to fig. 1 to 4, the second rotor 50 includes the third portion 51 and the fourth portion 52, the third portion 51 is a hollow cylindrical member, and the outer surface of the third portion 51 has a third spiral blade 511; the fourth portion 52 is a hollow cylindrical member, and has a fourth spiral blade 521 on the outer surface thereof; the third spiral blade 511 and the fourth spiral blade 521 have opposite screw threads, that is, the third portion 51 and the fourth portion 52 have opposite screw threads, the third spiral blade 511 of the third portion 51 is engaged with the first spiral blade 211 of the first portion 21, and the fourth spiral blade 521 of the fourth portion 52 is engaged with the second spiral blade 221 of the second portion 22, so that the second rotor 50 and the first rotor 20 are engaged with each other; wherein the number of the third spiral leaves 511 is at least two; the number of the fourth spiral leaves 521 is at least two. The second shaft body 60 carries the third and

fourth portions

51, 52 of the second rotor 50; the second shaft body 60 has a third end 62 and a fourth end 63, the third and

fourth portions

51, 52 of the second rotor 50 being constrained between the third and fourth ends 62, 63; the third part 51 and the fourth part 52 of the second rotor 50 are in transmission connection with the driving assembly through the second shaft body 60; the drive assembly may drive the second shaft 60 in rotation, and the second shaft 60 may rotate along its axis 61 with the third and

fourth portions

51, 52 of the second rotor 50 carried thereby. Illustratively, the third portion 51 and the fourth portion 52 of the second rotor 50 are connected with the second shaft body 60 through keys, the second shaft body 60 is driven by a motor to rotate along the axis 61 of the second shaft body, and the third portion 51 and the fourth portion 52 are driven to rotate together through key transmission.

The end faces of the first and

second portions

21, 22 of the first rotor 20 are adjacent. The end surfaces of the third and

fourth portions

51 and 52 of the second rotor 50 may or may not abut with a small gap such as 0.1 mm, 0.2 mm, 0.3 mm, etc. The end surfaces of the first and

second portions

21 and 22 of the first rotor 20 in the embodiment of the present invention are preferably spaced apart from each other to ensure that the first and

fourth portions

21 and 52 do not interfere with each other and the second and

third portions

22 and 51 do not interfere with each other.

When the second rotor 50 and the first rotor 20 rotate in mesh with each other, an opposite axial force is generated between the third spiral blade 511 and the fourth spiral blade 521 of the second rotor 50, and it can be understood that an opposite axial flow is generated between the third spiral blade 511 and the fourth spiral blade 521, and similarly, an opposite axial force is generated between the first spiral blade 211 and the second spiral blade 221 of the first rotor 20, and it can be understood that an opposite axial flow is generated between the first spiral blade 211 and the second spiral blade 221. Due to the symmetry of the axial force, the opposite axial force generated between the third spiral blade 511 and the fourth spiral blade 521 of the second rotor 50 can be almost cancelled, and the opposite axial force generated between the first spiral blade 211 and the second spiral blade 221 of the first rotor 20 can be almost cancelled.

In an alternative embodiment of the present invention, the third portion 51 and the fourth portion 52 of the second rotor 50 are respectively formed, and the third portion 51 and the fourth portion 52 are directly sleeved on the second shaft body 60. The third and

fourth portions

51 and 52 may be coupled to the second shaft body 60 by a coupling member, such as a key, to rotate together with the second shaft body 60 at the same speed. In another embodiment of the present invention, with continued reference to fig. 1 and 3, the third portion 51 (or the fourth portion 52) of the second rotor 50 is integrally formed with the second shaft 60 to form an integrally formed component, which can reduce the number of parts and facilitate the processing and installation and positioning. The fourth portion 52 (or the third portion 51) is sleeved on the second shaft 60, and the third portion 51 is adjacent to the fourth portion 52. The third portion 51 and the fourth portion 52 may be connected by a connecting member, such as a key, so that the third portion 51, the fourth portion 52 and the second shaft body 60 rotate together at the same speed.

Hereinafter, three solutions for implementing the sliding connection between the first rotor 20 and the first shaft 30 will be specifically provided in the embodiments of the present invention, and the first solution will be described in detail with reference to fig. 1 and fig. 2.

At least one sliding connection 70 for sliding rotation of the first rotor 20 relative to the first shaft 30 is provided between the inner surface of the first rotor 20 and the outer surface of the first shaft 30. In an alternative embodiment, the sliding connectors 70 are plural and are distributed along the first shaft 30 at equal intervals.

Referring to fig. 2, when the rotor assembly 100 has a four-rotor structure, the first rotor 20 includes a first portion 21 and a second portion 22, at least one sliding connector 70 is disposed between an inner surface of the first portion 21 and an outer surface of the first shaft 30, and at least one sliding connector 70 is disposed between an inner surface of the second portion 22 and an outer surface of the first shaft 30. When a plurality of sliding connectors 70 are arranged between the inner surface of the first part 21 and the outer surface of the first shaft body 30, the sliding connectors can be distributed at equal intervals along the axial direction of the first shaft body 30; when a plurality of sliding connections 70 are provided between the inner surface of the second portion 22 and the outer surface of the first shaft body 30, they may be equally spaced axially along the first shaft body 30.

In an embodiment of the present invention, referring to fig. 2, the sliding connector 70 is tightly connected to the first rotor 20, and when the first rotor 20 rotates around the first shaft 30, the sliding connector 70 rotates together with the first rotor 20, so that sliding friction is generated between the sliding connector 70 and the first shaft 30. In another embodiment, the sliding connector 70 is tightly connected with the first shaft 30, and sliding friction is generated between the first rotor 20 and the sliding connector 70 when the first rotor 20 rotates around the first shaft 30.

In one embodiment of the present invention, the sliding connector 70 is a bearing shell. For example, the bearing bush may be a one-piece bearing bush (also referred to as a bushing), or may be a split bearing bush; the bearing bush can also be provided with an oil groove; the bearing bush can be further provided with an oil hole so as to facilitate the passing of lubricating oil.

In the traditional rotor component, a female rotor is fixed on a female rotating shaft and drives the female rotating shaft to rotate when the female rotor rotates, therefore, radial force bearings for supporting the rotating shaft, reducing the friction force of the rotating shaft in the rotating process and balancing the radial force are required to be arranged at the two ends of the female rotating shaft, whereas in the embodiment of the present invention, the first shaft body 30 is equivalent to a journal, and the sliding connection member 70 (such as a bearing shell) is disposed between the first rotor 20 and the first shaft body 30, forming a sliding bearing structure, in this structure, the first shaft body 30 does not need to be rotated, so both ends of the first shaft body 30 can be directly fixed, furthermore, radial force bearings do not need to be arranged at two ends of the first shaft body 30, so that compared with the traditional rotor assembly, the embodiment of the invention reduces the installation space, enables the structure of the compressor to be more compact when the rotor assembly is used for the compressor, and reduces vulnerable parts; in addition, the sliding connector 70 (e.g., a bearing bush) is generally wear-resistant, and the sliding connector 70 (e.g., a bearing bush) disposed between the first rotor 20 and the first shaft 30 can prevent the first rotor 20 and the first shaft 30 from directly rubbing and wearing, thereby prolonging the service life.

In order to reduce the sliding friction between the sliding connection 70 and the first rotor 20 and/or between the sliding connection 70 and the first shaft body 30, a lubricating oil is provided between the sliding connection 70 and the first rotor 20 and/or between the sliding connection 70 and the first shaft body 30. So as to lubricate the sliding connection piece 70 and the first rotor 20 and/or the sliding connection piece 70 and the first shaft body 30, and reduce friction, so as to slow down the abrasion of the sliding connection piece 70, the first rotor 20 and/or the first shaft body 30 and prolong the service life.

In an embodiment of the present invention, the lubricating oil is supplied through an oil supply line, so as to realize continuous oil supply.

Referring to fig. 2, the oil supply line includes an oil supply passage 31 and an oil supply hole 32 communicating with the oil supply passage 31; the oil supply passage 31 is formed in the first shaft body 30 and extends in the axial direction of the first shaft body 30; the oil supply hole 32 is formed in the first shaft body 30 and extends in a radial direction of the first shaft body 30, and the oil supply hole 32 communicates with a gap 40 between the first rotor 20 and the first shaft body 30.

The present embodiment provides the sliding connection 70 between the first rotor 20 and the first shaft body 30, so when the oil supply line supplies oil to the gap 40 between the first rotor 20 and the first shaft body 30, since the sliding connection 70 is also in the gap 40 between the first rotor 20 and the first shaft body 30, the lubricating oil can permeate and flow between the sliding connection 70 and the first rotor 20 and/or between the sliding connection 70 and the first shaft body 30, so that the surfaces generating sliding friction are separated by the lubricating oil without direct contact, friction loss and surface wear can be reduced, and the lubricating oil also has a certain shock absorbing capability.

The number of the oil supply passages 31 and the oil supply holes 32 may be adjusted according to actual conditions, and the present invention is not particularly limited. It should be noted that, when the rotor assembly 100 is a two-rotor structure, at least one oil supply hole 32 is formed in the first shaft 30 corresponding to the first rotor 20; when the rotor assembly 100 is of a four-rotor structure, at least one oil supply hole 32 is formed in the first shaft 30 corresponding to the first portion 21 of the first rotor 20; the first shaft 30 is provided with at least one oil supply hole 32 corresponding to the second portion 22 of the first rotor 20.

For example, referring to fig. 2, an oil supply channel 31 and a plurality of (e.g., 6) oil supply holes 32 are formed in the first shaft body 30, the oil supply channel 31 is disposed along the axial direction of the first shaft body 30 and extends between the first end portion 34 and the second end portion 35, the plurality of (e.g., 6) oil supply holes 32 extend along the radial direction of the first shaft body 30, and one end of each oil supply hole 32 is communicated with the oil supply channel 31, and the other end is communicated with the gap 40; wherein, a half number (for example, 3) of the oil supply holes 32 are provided at a position corresponding to the first portion 21 of the first rotor 20, and a half number (for example, 3) of the oil supply holes 32 are provided at a position corresponding to the second portion 22 of the first rotor 20.

Referring to fig. 2, in the present embodiment, an oil outlet 24 extending in a radial direction may be further disposed on the first rotor 20, the oil outlet 24 penetrates through a wall body of the first rotor 20, one end of the oil outlet 24 is communicated with a gap 40 between the first rotor 20 and the first shaft 30, and the other end is communicated with an outside of the first rotor 20, so that the lubricating oil may be discharged from the gap 40 between the first rotor 20 and the first shaft 30, thereby implementing the oil circulation supply, and further lubricating an outer surface of the first rotor 20.

Referring to fig. 2, in order to facilitate the oil outlet of the oil supply hole 32, the first shaft 30 may further form a groove 36 at the outlet of the oil supply hole 32, the groove 36 extends along the axial direction of the first shaft 30 and communicates with the oil supply hole 32, and the cross-sectional size of the groove 36 is larger than the size of the outlet of the oil supply hole 32. The shape of the groove 36 is preferably crescent-shaped to facilitate the outflow of the lubricant during rotation.

In the foregoing embodiments of the first scheme, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.

The second solution will be described in detail below with reference to fig. 3 and 4.

Referring to fig. 3 and 4, the first rotor 20 and/or the first shaft 30 are made of non-metallic materials. In this embodiment, the first rotor 20 and/or the first shaft body 30 are made of a non-metallic material, so that when the first rotor 20 and the first shaft body 30 rotate in a sliding manner, wear between the first rotor 20 and the first shaft body 30 can be reduced, and the service life can be prolonged.

In an alternative embodiment, one of the first rotor 20 and the first shaft 30 is made of a non-metallic material, and the other is made of a metallic material, that is, the first rotor 20 is made of a non-metallic material and the first shaft 30 is made of a metallic material, or the first rotor 20 is made of a metallic material and the first shaft 30 is made of a non-metallic material. This not only ensures the overall strength of the rotor assembly 100, but also reduces the wear between the first rotor 20 and the first shaft 30, and prolongs the service life.

When the rotor assembly 100 is a four-rotor, the first rotor 20 is made of a non-metal material, which means that the first portion 21 and the second portion 22 of the first rotor 20 are both made of a non-metal material; the first rotor 20 is made of a metal material, which means that the first portion 21 and the second portion 22 of the first rotor 20 are made of a metal material. Such as a cemented carbide material.

In a preferred embodiment, the non-metallic material has self-lubricating properties, such as a peek material. The self-lubricating non-metallic material can not only improve the lubricity and further reduce the friction force, but also save the use of the lubricant, and most importantly, under the influence of various uncontrollable factors, such as insufficient lubricant or failure of oil supply, and the viscosity increase of the lubricant entering dust, the conditions such as insufficient lubrication, increased friction force, direct contact friction and the like occur between the first shaft body 30 and the first rotor 20, especially under the condition that the first rotor 20 is in a high-speed rotation state, once the rotor of the metallic material and the rotating shaft of the metallic material are in contact friction, the abrasion is large, the service life is shortened, and even the occurrence of failure is caused, while the embodiment can reduce the abrasion between the first rotor 20 and the first shaft body 30 under the lubricating action of the first rotor 20 or the first shaft body 30 which adopt the self-lubricating non-metallic material, even if the first rotor 20 and the first shaft body 30 are contacted and rubbed, the friction is not seriously damaged, and the service life is prolonged.

In addition, although the opposing axial forces generated between the third and

fourth portions

51 and 52 of the second rotor 50 can be nearly cancelled as described above, but there is a difference in the construction of the third and

fourth portions

51 and 52 of the second rotor 50 due to the deviation, and the first and

second portions

21 and 22 of the first rotor 20 are configured differently, and the other side has tolerance and deviation problems due to assembly, resulting in a certain difference in fit between the first and

second rotors

20 and 50, which in turn results in that the axial forces between the first part 21 and the second part 22 cannot be completely counteracted, the axial force between the third portion 51 and the fourth portion 52 cannot be completely cancelled, so that the axial force can be almost completely cancelled when the first rotor 20 and the second rotor 50 are meshed with each other and rotate together, and a resultant axial force with random directions is formed.

In the above case, radial force bearings such as cylindrical roller bearings may be respectively disposed at both ends of the second shaft body 60 to achieve radial constraint, and axial force bearings (also called thrust bearings) such as angular contact ball bearings may be disposed at least at one end of the second shaft body 60 to constrain resultant axial force; in the case that the thrust bearings are not provided at both ends of the first shaft 30, when the rotor assembly 100 is used in a compressor, the first portion 21 and the second portion 22 may collide against a housing of the compressor due to the resultant force of the axial force, so that the housing and the first rotor 20 are damaged, and therefore, when the rotor assembly 100 is used in a compressor, it is actually necessary to arrange the thrust bearings at both ends of the first shaft 30 to prevent the first rotor 20 from being damaged by contact and friction with the housing of the compressor. In the embodiment, the first rotor 20 (or the first portion 21 and the second portion 22) is made of a non-metallic material, and the collision force and the friction force generated when the first rotor 20 (or the first portion 21 and the second portion 22) and the shell of the compressor collide and rub are small, so that the shell is not damaged, especially, the self-lubricating non-metallic material is adopted, so that the friction can be further lubricated and reduced during the friction and collision, and further thrust bearings do not need to be arranged at two ends of the first shaft body 30, the number of components and the arrangement space are reduced, and the volume of the compressor is reduced.

In an embodiment of the present invention, referring to fig. 4, a gap 40 is defined between an inner surface of the first rotor 20 and an outer surface of the first shaft 30, and the gap 40 is filled with a lubricating oil, so that the lubricating oil is filled in the gap 40 between the inner surface of the first rotor 20 and the outer surface of the first shaft 30, and an oil film is formed between the inner surface of the first rotor 20 and the outer surface of the first shaft 30. The inner surface of the first rotor 20, which generates sliding friction, and the outer surface of the first shaft body 30 may be separated from direct contact by the lubricating oil, thereby reducing friction loss and surface wear, and the lubricating oil may have a certain shock absorbing capability.

In the conventional rotor assembly, the female rotor is fixed on the female rotating shaft, and the female rotating shaft is driven to rotate together when the female rotor rotates, so radial force bearings for supporting the rotating shaft, reducing the friction force of the rotating shaft in the rotating process and balancing the radial force need to be arranged at both ends of the female rotating shaft, and in this embodiment, the first rotor 20 and/or the first shaft body 30 are made of self-lubricating non-metallic materials, and lubricating oil is filled between the first rotor 20 and the first shaft body 30 to form an oil film, so as to form a sliding bearing structure, so that the first rotor 20 can rotate around the first shaft body 30, and since the first shaft body 30 does not need to rotate, radial force bearings do not need to be arranged at both ends of the first shaft body 30, in addition, compared with the first solution, the present embodiment can also omit the sliding connection member 70, so that the structure of the rotor assembly 100 is simpler, and the number of wearing parts is reduced.

Referring to fig. 4, the oil supply line includes an oil supply passage 31 and an oil supply hole 32 communicating with the oil supply passage 31; the oil supply passage 31 is formed in the first shaft body 30 and extends in the axial direction of the first shaft body 30; the oil supply hole 32 is formed in the first shaft body 30 and extends in a radial direction of the first shaft body 30, and the oil supply hole 32 communicates with a gap 40 between the first rotor 20 and the first shaft body 30.

The oil supply passage 31 and the oil supply hole 32 can supply the lubricating oil to the gap 40 to continuously supply the lubricating oil to the gap 40, so that a stable oil film is formed between the outer surface of the first shaft body 30 and the inner surface of the first rotor 20, and thus surfaces generating sliding friction are separated by the lubricating oil without direct contact, friction loss and surface wear can be reduced, it is ensured that the first rotor 20 can always smoothly rotate on the first shaft body 30, and the lubricating oil also has certain shock absorption capability.

For example, referring to fig. 3 and 4, an oil supply passage 31 and a plurality of (e.g., 6) oil supply holes 32 are formed in the first shaft body 30, the oil supply passage 31 is disposed along the axial direction of the first shaft body 30 and extends between the first end portion 34 and the second end portion 35, the plurality of (e.g., 6) oil supply holes 32 extend along the radial direction of the first shaft body 30, and one end of each oil supply hole 32 is communicated with the oil supply passage 31, and the other end is communicated with the gap 40; wherein, a half number (for example, 3) of the oil supply holes 32 are provided at a position corresponding to the first portion 21 of the first rotor 20, and a half number (for example, 3) of the oil supply holes 32 are provided at a position corresponding to the second portion 22 of the first rotor 20.

Referring to fig. 4, in order to facilitate the oil outlet of the oil supply hole 32, the first shaft 30 may further form a groove 36 at the outlet of the oil supply hole 32, the groove 36 extends along the axial direction of the first shaft 30 and communicates with the oil supply hole 32, and the cross-sectional size of the groove 36 is larger than the size of the outlet of the oil supply hole 32. The shape of the groove 36 is preferably crescent-shaped to facilitate the outflow of the lubricant during rotation.

Referring to fig. 4, in this embodiment, the first rotor 20 may further include an oil outlet 24 extending in a radial direction, the oil outlet 24 penetrates through a wall body of the first rotor 20, one end of the oil outlet 24 is communicated with a gap 40 between the first rotor 20 and the first shaft 30, and the other end is communicated with an outside of the first rotor 20, so that the lubricating oil may be discharged from the gap 40 between the first rotor 20 and the first shaft 30, so as to realize the oil circulation supply, and further lubricate an outer surface of the first rotor 20.

In an embodiment of the present invention, the second rotor 50 may be made of a metal material or a non-metal material. The metal material such as forged steel or cast iron; the non-metallic material may have self-lubricating properties, such as a peek material.

In an alternative embodiment of the present invention, at least one of the second rotor 50 and the first rotor 20 is made of a self-lubricating non-metallic material, namely: one of the second rotor 50 and the first rotor 20 is made of a non-metallic material and the other is made of a metallic material, or the second rotor 50 and the first rotor 20 are both made of a self-lubricating non-metallic material, so that the smoothness of transmission is improved when the second rotor 50 is meshed with the first rotor 20, and vibration and noise are reduced.

Illustratively, the second rotor 50 is forged steel or cast iron, the first shaft body 30 is a self-lubricating non-metallic material, and the first rotor 20 is hard alloy steel; or, the first shaft 30 is hard alloy steel, the first rotor 20 is a self-lubricating non-metallic material, and the second rotor 50 is forged steel or cast iron; or, the first shaft body 30 is a self-lubricating non-metallic material, the first rotor 20 is hard alloy steel, and the second rotor 50 is a self-lubricating non-metallic material; or, the first shaft 30 is made of hard alloy steel, the first rotor 20 is made of a self-lubricating non-metallic material, and the second rotor 50 is made of a self-lubricating non-metallic material.

In the embodiments of the second scheme, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.

The third scheme will be described in detail below with reference to fig. 3 and 4.

Referring to fig. 4, a gap 40 is defined between the inner surface of the first rotor 20 and the outer surface of the first shaft 30, and the gap 40 is filled with lubricating oil, so that the lubricating oil is disposed between the inner surface of the first rotor 20 and the outer surface of the first shaft 30, and an oil film is formed between the inner surface of the first rotor 20 and the outer surface of the first shaft 30. The inner surface of the first rotor 20, which generates sliding friction, and the outer surface of the first shaft body 30 may be separated from direct contact by the lubricating oil by a lubricating oil or an oil film, thereby reducing friction loss and surface wear, and the lubricating oil may have a certain shock absorbing capability.

Any combination of the above first, second and third aspects is possible.

In the first, second and third schemes, there may be a phenomenon that the lubricating oil is not delivered to the place needing lubrication in time due to insufficient starting oil pressure, and the lubricating oil does not rotate without oil, so that the rotation for several minutes may cause irreversible damage. To solve this problem, the inner wall of the first rotor 20 is further provided with at least one oil reservoir 23. It should be noted that, when the rotor assembly 100 is of a four-rotor structure, the inner wall of the first portion 21 of the first rotor 20 is provided with at least one oil storage groove 23; the inner wall of the second part 22 of the first rotor 20 is provided with at least one oil reservoir 23. The oil reservoir 23 is formed by recessing the inner wall of the first rotor 20, and stores lubricating oil therein in advance. The oil reservoir 23 may be shaped, for example, as an annular groove extending in the circumferential direction of the first shaft body 30. It should be noted that the shape of the oil reservoir 23 can be adjusted according to the requirement, and the illustrated shape is only an exemplary one and is not intended to limit the present invention.

Referring to fig. 2 and 4, the inner wall of the first portion 21 is provided with 3 oil reservoirs 23, the inner wall of the second portion 22 is provided with 3 oil reservoirs 23, and the oil reservoirs 23 are shaped as annular grooves extending along the circumferential direction of the first shaft 30.

The rotor assembly 100 in one or more of the above embodiments may be applied to a compressor and an air conditioner.

Embodiments of the present invention also provide a compressor including a rotor assembly 100 as defined above in combination with one or more embodiments.

The foregoing detailed description of the embodiments of the present application has been presented to illustrate the principles and implementations of the present application, and the above description of the embodiments is only provided to help understand the method and the core concept of the present application; meanwhile, for those skilled in the art, according to the idea of the present application, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present application.

Claims

1. A rotor assembly, comprising:

a first rotor;

a first shaft body carrying the first rotor;

2. The rotor assembly of claim 1 wherein at least one slip connection is provided between an inner surface of the first rotor and an outer surface of the first shaft for allowing the first rotor to rotate slidingly relative to the first shaft.

3. The rotor assembly of claim 2 wherein the sliding connection is a bushing.

4. The rotor assembly of claim 2 wherein a lubricating oil is provided between the slip connection and the first rotor and/or between the slip connection and the first shaft.

5. The rotor assembly of claim 1 wherein the first rotor is a non-metallic material and/or the first shaft is a non-metallic material.

6. The rotor assembly of claim 5 wherein one of the first rotor and the first shaft body is a non-metallic material and the other is a metallic material.

7. The rotor assembly of claim 5 wherein the non-metallic material is self-lubricating.

8. The rotor assembly of claim 5 wherein a gap between the inner surface of the first rotor and the outer surface of the first shaft has lubricating oil disposed therein.

9. The rotor assembly of claim 1 wherein a lubricating oil is disposed between the inner surface of the first rotor and the outer surface of the first shaft.

10. The rotor assembly of any one of claims 1-9, further comprising:

a second rotor meshed with the first rotor; and

a second shaft carrying the second rotor;

11. The rotor assembly of claim 10 wherein at least one of the second rotor and the first rotor is a self-lubricating non-metallic material.

12. The rotor assembly of claim 10 wherein the first rotor includes a first portion and a second portion coaxially disposed on the first shaft, the first portion being opposite in thread direction to the second portion; and the second rotor comprises a third part and a fourth part which are coaxially arranged on the second shaft body, the third part is meshed with the first part, and the fourth part is meshed with the second part.

13. The rotor assembly of claim 12 wherein at least one sliding connection is provided between the inner surface of the first portion and the outer surface of the first shaft, and at least one sliding connection is provided between the inner surface of the second portion and the outer surface of the first shaft.

14. The rotor assembly of claim 12 wherein the third or fourth portion of the second rotor is integrally formed with the second shaft.

15. A compressor, characterized by comprising an assembly of rotors according to any one of claims 1 to 14.

16. An air conditioner characterized by comprising the compressor of claim 15.