CN216306217U

CN216306217U - Rotor subassembly, compressor and air conditioner

Info

Publication number: CN216306217U
Application number: CN202122616997.1U
Authority: CN
Inventors: 唐晗; 武晓昆; 龙忠铿; 曹聪
Original assignee: Gree Electric Appliances Inc of Zhuhai
Current assignee: Gree Electric Appliances Inc of Zhuhai
Priority date: 2021-10-28
Filing date: 2021-10-28
Publication date: 2022-04-15
Anticipated expiration: 2031-10-28

Abstract

The utility model provides a rotor assembly, a compressor and an air conditioner, wherein a first rotor can rotate along a first axis and comprises a first working part and a second working part; a first shaft body carrying a first working part and a second working part; and the hydraulic device is arranged on the first shaft body and used for applying acting force which is along the axial direction of the first shaft body and faces to the preset direction to the first shaft body. The acting force along the axial direction of the first shaft body and towards the preset direction is applied to the first shaft body through the hydraulic device, so that the first rotor has the acting force in a single direction when rotating, the specific direction of the axial force in the single direction in the running process of the compressor can be determined, and related measures can be taken to limit the axial force in the single direction. Compared with the prior art, can all restrict the both ends of first axis body, and can only restrict the one end of first axis body to the effect direction of this axial force can, effectively reduce the size of rotor subassembly.

Description

Rotor subassembly, compressor and air conditioner

Technical Field

The utility model 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.

In the rotating process of the pair of screw rotors, two axial forces in opposite directions are formed along the axial direction of the rotation of the screw rotors, and in order to limit the axial forces in the two directions of the screw rotors in the rotating process, two thrust bearings are arranged on a rotating shaft bearing the screw rotors to limit the axial forces in the two directions, so that the screw rotors are relatively stable in rotation. Because both ends of the rotating shaft are required to be provided with thrust bearings, the structure size of the spiral rotor is larger, and a larger structure space is required to be occupied.

SUMMERY OF THE UTILITY MODEL

The embodiment of the utility model provides a rotor assembly, a compressor and an air conditioner, which can reduce the structural size of the rotor assembly on the basis of basically unchanging the displacement of the compressor.

In a first aspect, an embodiment of the present invention provides a rotor assembly, including:

a first rotor rotatable along a first axis, the first rotor including a first working portion and a second working portion;

a first shaft body carrying the first working part and the second working part; and

and the hydraulic device is arranged on the first shaft body and used for applying acting force to the first shaft body along the axial direction of the first shaft body and towards a preset direction.

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

a second rotor rotatable along a second axis, the second rotor including a third working portion and a fourth working portion; and

a second shaft carrying the third working portion and the fourth working portion, the third working portion being engaged with the first working portion and the fourth working portion being engaged with the second working portion.

In an optional implementation manner of the present invention, the hydraulic device includes a cylinder and a piston, the first shaft is inserted into the cylinder, the piston is disposed on the first shaft and located in the cylinder, the piston divides the cylinder into a first space and a second space, the second space is used for injecting liquid so that a pressure of the second space is greater than a pressure of the first space, and a pressure difference between the second space and the first space causes the first shaft to have a force along an axial direction of the first shaft and toward a preset direction.

In an alternative embodiment of the utility model, the piston is rotatable with the first shaft, the piston being sealingly arranged with an inner side wall of the cylinder.

In an optional implementation manner of the present invention, a positioning shoulder is disposed on the first shaft, the piston abuts against the positioning shoulder, a fastening member is disposed on a side of the piston away from the positioning shoulder, and the fastening member and the positioning shoulder fix the piston on the first shaft together.

In an optional implementation manner of the present invention, the cylinder body is provided with a liquid inlet, the liquid inlet is communicated with the second space, the second shaft body is provided with a first channel which is through along an axial direction of the second shaft body, a first end of the first channel is used for liquid inlet, and a second end of the first channel is communicated with the liquid inlet.

In an optional implementation manner of the present invention, the rotor assembly further includes a housing, the first rotor is rotatably disposed in the housing, the cylinder is fixedly disposed outside the housing, and the first shaft extends out of the housing and is rotatably connected to the cylinder.

In an optional implementation manner of the present invention, the rotor assembly further includes a thrust bearing, the thrust bearing is disposed at one end of the first shaft, and the thrust bearing is configured to limit the first shaft from moving in a direction of the acting force.

In a second aspect, an embodiment of the present invention further provides a compressor, which includes a motor and the rotor assembly as described above, where the motor is in transmission connection with the first shaft body.

In a third aspect, an embodiment of the present invention further provides an air conditioner, including the compressor as described above.

According to the rotor assembly, the compressor and the air conditioner, the hydraulic device is arranged on the first shaft body, acting force which is along the axial direction of the first shaft body and faces to the preset direction is applied to the first shaft body through the hydraulic device, so that the first rotor has acting force in a single direction when rotating, the specific direction of the axial force in the single direction of the first rotor in the operation process can be determined, and related measures can be taken to limit the axial force in the single direction. Compared with the prior art, can all restrict the both ends of first axis body, and can only restrict the one end of first axis body to the effect direction of this axial force can, the effectual structure size who has less the rotor subassembly. Therefore, when the rotor assembly provided by the embodiment of the utility model is applied to a compressor, the structural size of the rotor assembly can be reduced under the condition that the air displacement of the compressor is basically not influenced and the stability of the compressor is basically not influenced, so that the size of the compressor is reduced. For example, compared with the prior art that two thrust bearings are adopted to limit one rotor structure, the embodiment of the utility model can adopt one thrust bearing to limit one rotor so as to stably run, so that the structural size of the rotor assembly can be effectively reduced. And by providing a first rotor comprising a first working portion and a second working portion that can mesh with other rotor structures such as a second rotor during rotation of the first rotor, the first working portion of the first rotor meshes with a third working portion of the second rotor, and the second working portion of the first rotor meshes with a fourth working portion of the second rotor, two sets of rotor pairs can be formed, the meshing of the first rotor and the second rotor of the embodiment of the present invention is equivalent to two screw compressors in parallel compared to the prior art. Therefore, the compressor provided by the embodiment of the utility model can greatly reduce the size of the compressor under the condition of the same or similar air displacement as that of a screw compressor in the prior art.

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 partial schematic view of a compressor according to an embodiment of the present invention.

Fig. 2 is a first partial schematic view of a connection between the first shaft and the cylinder in fig. 1.

Fig. 3 is a second partial schematic view of the connection between the first shaft and the cylinder in fig. 1.

Fig. 4 is a third partial schematic view of the connection between the first shaft and the cylinder in fig. 1.

Fig. 5 is a fourth partial schematic view of the connection between the first shaft and the cylinder in fig. 1.

Reference numerals:

100. a compressor; 10. a motor; 20. a rotor assembly;

21. a first shaft body; 211. a first axis; 212. a first seal groove; 213. a second seal groove; 214. positioning the shaft shoulder;

22. a first rotor; 221. a first working portion; 222. a second working portion;

23. a second shaft body; 231. a second axis; 232. a first channel;

24. a second rotor; 241. a third working section; 242. a fourth working section;

25. a housing; 251. a housing body; 252. a first end cap; 2521. a second channel; 253. a second end cap;

26. a hydraulic device; 261. a cylinder body; 2611. a first space; 2612. a second space; 2613. a liquid inlet; 2614. annular seal teeth; 262. a piston;

27. a thrust bearing;

30. a seal ring; 40. a slip ring; 50. a fastener;

h1, first direction; h2, second direction.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. It is to be understood that the embodiments described are only a few embodiments of the present application and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without inventive step, are within the scope of the present application.

The embodiment of the utility model provides a rotor assembly, a compressor and an air conditioner, which can reduce the size of the compressor on the basis of basically unchanging the displacement of the compressor. This will be explained below with reference to the drawings.

Referring to fig. 1, fig. 1 is a partial schematic view of a compressor according to an embodiment of the present invention. The compressor shown in FIG. 1 may be a screw compressor, such as compressor 100 being an opposed screw compressor. The compressor 100 may include a motor 10 and a rotor assembly 20, the motor 10 is in driving connection with the rotor assembly 20 to drive the rotor assembly 20 to rotate, wherein the rotor assembly 20 may include a first shaft body 21, a first rotor 22, a second shaft body 23, a second rotor 24 and a housing 25. The housing 25 may accommodate the first rotor 22 and the second rotor 24, and the housing 25 may accommodate a portion of the first shaft body 21 and a portion of the second shaft body 23, i.e., the housing 25 has an accommodation space that accommodates the first rotor 22, the second rotor 24, a portion of the first shaft body 21, and a portion of the second shaft body 23. The first shaft body 21 carries the first rotor 22, the second shaft body 23 carries the second shaft body 23, and the first shaft body 21 and the second shaft body 23 are rotatably connected with the housing 25, i.e., the housing 25 plays a role of supporting the first shaft body 21 and the second shaft body 23.

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 described above are used for distinguishing between 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.

The first rotor 22 and the second rotor 24 are meshed. In an embodiment of the present invention, the first rotor 22 may be a male rotor and the second rotor 24 may be a female rotor.

Here, the first rotor 22 as a male rotor may be understood as a driving rotor, and the second rotor 24 as a female rotor may be understood as a driven rotor, respectively, with the first rotor 22. For example, the first rotor 22 may be drivingly connected to a drive assembly, such as the motor 10 (including but not limited to a permanent magnet motor), and the first rotor 22 may be driven to rotate by the drive assembly, such that the first rotor 22 rotates while simultaneously rotating the second rotor 24.

Referring to fig. 1, the first rotor 22 is carried by the first shaft 21, and is in transmission connection with the motor 10 through the first shaft 21. The motor 10 may drive the first shaft 21 to rotate, and the first shaft 21 may rotate along the first axis 211 of the first shaft 21 together with the first rotor 22 carried by the first shaft. I.e., the first rotor 22 may rotate within the housing 25 along the first axis 211. In the embodiment of the present invention, the first rotor 22 may be integrally formed with the first shaft body 21. In other embodiments of the present invention, a portion of the first rotor 22 may be integrally formed with the first shaft 21, and a portion of the first rotor may be sleeved on the first shaft 21. In other embodiments of the present invention, the first rotor 22 can be directly sleeved on the first shaft 21.

Illustratively, the first rotor 22 may have at least two parts such as the first rotor 22 having a first working portion 221 and a second working portion 222, and both the first working portion 221 and the second working portion 222 may be integrally formed with the first shaft body 21. One of the first working portion 221 and the second working portion 222, such as the first working portion 221, may be integrally formed with the first shaft 21, and the other one, such as the second working portion 222, may be sleeved on the first shaft 21. Or the first working portion 221 and the second working portion 222 are both sleeved on the first shaft 21.

With continued reference to fig. 1, the first and second working

portions

221, 222 of the first rotor 22 may be helical lobes, which may also be referred to as male lobes. The number of the spiral leaves can be more than one. The first working portion 221 and the second working portion 222 of the present embodiment are configured to have opposite helical directions, i.e., the rotational directions of the first working portion 221 and the second working portion 222 are opposite. When the first rotor 22 and the second rotor 24 rotate in mesh with each other, an opposing axial force is generated between the first working portion 221 and the second working portion 222, which can also be understood as an opposing axial flow between the first working portion 221 and the second working portion 222. Due to the symmetry of the axial forces, the opposing axial forces generated between the first working portion 221 and the second working portion 222 can be nearly cancelled out.

It is to be noted that, in the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

With continued reference to fig. 1, the second rotor 24 is carried by the second shaft 23, the second shaft 23 is configured to rotatably support the second rotor 24, and the second rotor 24 can rotate relative to the second shaft 23. The second rotor 24 is engaged with the first rotor 22 and is driven by the first rotor 22 to rotate on the second shaft 23 along the second axis 231 of the second shaft 23. The second rotor 24 may have at least two portions such as the second rotor 24 having a third working portion 241 and a fourth working portion 242, both the third working portion 241 and the fourth working portion 242 being fitted over the second shaft body 23. The third working portion 241 and the fourth working portion 242 are both rotatable within the housing 25 about the second axis 231.

The third working portion 241 engages the first working portion 221 and the fourth working portion 242 engages the second working portion 222. Wherein the third working portion 241 has a rotation direction opposite to that of the first working portion 221 and the fourth working portion 242 has a rotation direction opposite to that of the second working portion 222.

The third working portion 241 and the fourth working portion 242 of the second rotor 24 may be helical lobes, which may also be referred to as female lobes. The number of the spiral leaves can be one or more. The third working portion 241 and the fourth working portion 242 of the present embodiment are configured to have opposite helical directions, i.e., the third working portion 241 and the fourth working portion 242 have opposite rotational directions. When the first and

second rotors

22, 24 rotate in mesh with each other, an opposing axial force is generated between the third and fourth working

portions

241, 242, which may also be understood as an opposing axial flow between the third and fourth working

portions

241, 242. Due to the symmetry of the axial forces, the opposing axial forces generated between the third working portion 241 and the fourth working portion 242 can be nearly cancelled.

The first rotor 22 of the embodiment of the present invention includes the first working portion 221 and the second working portion 222, and may be engaged with other rotor structures such as the second rotor 24 during the rotation of the first rotor 22, the first working portion 221 of the first rotor 22 is engaged with the third working portion 241 of the second rotor 24, and the second working portion 222 of the first rotor 22 is engaged with the fourth working portion 242 of the second rotor 24 to form two sets of rotor pairs, compared to the prior art, the engagement of the first rotor 22 and the second rotor 24 of the embodiment of the present invention is equivalent to two screw compressors connected in parallel. Therefore, the compressor 100 according to the embodiment of the present invention can greatly reduce the size of the compressor 100 under the condition of the same or similar discharge capacity of the screw compressor in the prior art.

For the first rotor 22 and the second rotor 24, when the first rotor 22 and the second rotor 24 are meshed with each other and rotate together, due to the fact that the opposite rotation directions between the first working portion 221 and the second working portion 222 can generate opposite axial forces, and the opposite rotation directions between the third working portion 241 and the fourth working portion 242 can generate opposite axial forces, the axial forces between the first working portion 221 and the second working portion 222 can be offset to some extent, and the axial forces between the third working portion 241 and the fourth working portion 242 can be offset to some extent.

It should be noted, however, that in actual production processes, it has been found that, on the one hand, there are some differences in the construction of the different parts of the first rotor 22 and some differences in the construction of the different parts of the second rotor 24, due to manufacturing variations. And the first rotor 22 and the second rotor 24 may also differ from each other. The other side has tolerance and deviation problems due to assembly, which causes a certain difference in fit between the first rotor 22 and the second rotor 24. This in turn results in the impossibility of a complete cancellation of the axial forces between the first working portion 221 and the second working portion 222 and a complete cancellation of the axial forces between the third working portion 241 and the fourth working portion 242. The inability to rotate the first rotor 22 and the second rotor 24 in mesh with each other results in nearly complete cancellation of the axial forces, yet results in a resultant of the axial forces in random directions. As shown in fig. 1, the resultant axial force may be directed in the first direction H1, and the resultant axial force may be directed in the second direction H2.

On the other hand, in the product quantification of the compressor 100, the resultant axial force directions generated by the rotors in the compressors 100 are different due to the difference between the rotors in the compressors 100, for example, the resultant axial force directions of the rotors in some compressors 100 are directed toward the first direction H1, and the resultant axial force directions of the rotors in some compressors 100 are directed toward the second direction H2. That is, a resultant force with random axial direction and random numerical value occurs in the whole rotor shaft system, so that the whole shaft system is randomly pushed to one of the two exhaust end surfaces, and the exhaust end surface of the side rotor is contacted and rubbed with the end surface of the shell 25, thereby causing the occurrence of faults.

In the related art, in order to ensure that all the molded compressors 100 can stably operate, two sets of thrust bearings 27 (or axial force bearings) are sleeved on each shaft body of the compressor 100 to limit the resultant axial force of the rotors in all the molded compressors 100, so as to ensure that all the molded compressors 100 can stably operate.

Therefore, the bearing limit of the thrust bearing 27 is still inevitably needed, and due to the randomness of the resultant force direction, the thrust bearing 27 needs to meet the requirement that the bearing limit can be carried in both directions, that is, in order to ensure the limitation of the resultant axial force of the rotor in the actual production and processing process of the compressor 100, the thrust bearing 27 (axial force bearing) in two directions still needs to be limited on one rotating shaft, such as the compressor 100 is provided with two sets of thrust bearings 27 with opposite bearing directions, so as to ensure that the resultant axial force in two directions which occurs randomly is carried. For an independent compressor 100, the direction of the resultant force of the axial force randomly generated is always unchanged, one group of thrust bearings 27 is used for limiting, and the other group of thrust bearings 27 is completely idle, so that the cost performance is low, redundant mechanical loss and lubricating oil demand are added, and the failure rate of the compressor 100 is increased. Finally, the size and the cost of the compressor 100 assembly are increased, the mechanical efficiency of shafting operation is reduced to a certain extent, and the requirement of lubricating oil quantity is increased.

Based on this, as shown in fig. 1, the embodiment of the present invention has the hydraulic device 26 disposed on the first shaft body 21, and applies a force to the first shaft body 21 in the axial direction of the first shaft body 21 and in a predetermined direction through the hydraulic device 26, so as to ensure that the first rotor 22 and the second rotor 24 have a definite resultant axial force in a single axial direction when the first rotor 22 and the second rotor 24 are meshed with each other and rotate together. Therefore, the embodiment of the present invention only needs to provide the thrust bearing 27 on one end of the first shaft body 21 to achieve the limitation of the resultant force of the axial force in the determined single axial direction, and it can be understood that the thrust bearing 27 can limit the first shaft body 21 from moving in the direction of the thrust force, so as to ensure that the first rotor 22 and the second rotor 24 of the compressor 100 according to the embodiment of the present invention can stably rotate without causing the exhaust end face of the rotor to contact and rub with the end face of the housing 25. Compared with the related art in which two thrust bearings 27 are required to be fixed to both ends of one shaft body, the compressor 100 according to the embodiment of the present invention can save a plurality of thrust bearings 27, and can reduce the overall size and cost of the compressor 100. Meanwhile, the number of the thrust bearings 27 is reduced, so that the shafting operation efficiency can be improved to a certain extent, and the requirement on the amount of lubricating oil is reduced.

It is understood that the first shaft body 21 has a first end portion and a second end portion which are oppositely arranged, the first working portion 221 and the second working portion 222 are located between the first end portion and the second end portion, and the hydraulic device 26 may be arranged on the first end portion or the second end portion of the first shaft body 21, as long as it can apply a force to the first shaft body 21 along the axial direction of the first shaft body 21 and towards a preset direction. For example, as shown in fig. 1, the preset direction may be a direction along the axial direction of the first shaft body 21 and toward the motor 10, and at this time, a direction along the axial direction of the first shaft body 21 and toward the motor 10 may be defined as a first direction H1, and a direction opposite to the first direction H1 may be defined as a second direction H2. For example, referring to fig. 1, the hydraulic device 26 is disposed at one end of the first shaft 21 close to the motor 10, and the hydraulic device 26 applies a predetermined acting force in the first direction H1 to the first shaft 21, it can be understood that the predetermined acting force in the first direction H1 applied by the hydraulic device 26 needs to be: the first shaft body 21 can be made to have the resultant axial force along the first direction H1, and the first rotor 22 and the second rotor 24 have the determined resultant axial force facing the first direction H1, and then the resultant axial force in the determined direction can be limited by taking relevant measures according to the resultant axial force in the determined direction, such as providing a thrust bearing 27 at one end of the first shaft body 21, and limiting the resultant axial force in the determined direction by the thrust bearing 27. Since the space of the end of the first shaft 21 close to the motor 10 is small, the thrust bearing 27 may be installed at the end of the first shaft 21 away from the motor 10 in order to facilitate the installation of the thrust bearing 27. Of course, if the space allows, the thrust bearing 27 may be disposed at one end of the first shaft body 21 close to the motor 10, and it is understood that the specific location of the thrust bearing 27 may be selected according to the specific situation, as long as it can play a role of limiting the movement of the first shaft body 21 in the direction of the force.

In order to more clearly explain the structure of the hydraulic device 26, the specific structure of the hydraulic device 26 will be described below with reference to the drawings.

For example, the hydraulic device 26 of the embodiment of the present invention may apply the force by using high-pressure oil, and of course, other liquids that do not have a great influence on the compressor 100 may be used, and the present invention is not limited thereto.

As shown in fig. 1, the hydraulic device 26 may include a cylinder 261 and a piston 262, the cylinder 261 is fixedly disposed outside the housing 25, one end of the first shaft 21 penetrates through the housing 25 and the cylinder 261, the piston 262 is disposed on the first shaft 21 and located in the cylinder 261, wherein the piston 262 divides the cylinder 261 into a first space 2611 and a second space 2612, the second space 2612 is used for injecting liquid to make the pressure of the second space 2612 greater than that of the first space 2611, when the pressure difference is formed between the second space 2612 and the first space 2611, the liquid exerts a force towards the first space 2611 on the piston 262, since the piston 262 is provided on the first shaft body 21, the force can also act on the first shaft body 21, that is, a pressure difference is formed between the second space 2612 and the first space 2611, so that the first shaft body 21 has a force along the axial direction of the first shaft body 21 and toward a predetermined direction. For example, as shown in fig. 1, the first space 2611 is located on a side of the piston 262 close to the motor 10, the second space 2612 is located on a side of the piston 262 away from the motor 10, a fluid inlet 2613 is provided on the cylinder 261, the fluid inlet 2613 is communicated with the second space 2612, at this time, the fluid inlet 2613 may be externally connected with an oil pump, and the oil pump injects high-pressure oil into the second space 2612 through the fluid inlet 2613, so that pressure of the high-pressure oil acting on the piston 262 can be transmitted to the first shaft body 21 through the piston 262, and the first shaft body 21 has an acting force (i.e., an acting force in a first direction H1) along an axial direction of the first shaft body 21 and in a direction toward the first space 2611.

Of course, in other embodiments, the first space 2611 may be located on a side of the piston 262 facing away from the motor 10, the second space 2612 may be located on a side of the piston 262 facing away from the motor 10, the cylinder 261 is provided with a fluid inlet 2613, the fluid inlet 2613 is communicated with the second space 2612, at this time, the fluid inlet 2613 may be externally connected with an oil pump, and the oil pump injects high-pressure oil into the second space 2612 through the fluid inlet 2613, so that the pressure of the high-pressure oil acting on the piston 262 may be transmitted to the first shaft body 21 through the piston 262, and the first shaft body 21 may have an acting force along the axial direction of the first shaft body 21 and toward the second direction H2.

In order to fully utilize the spatial structure of the rotor assembly 20, the liquid inlet channel may be combined with the shaft body, for example, as shown in fig. 1, a first channel 232 that penetrates in the axial direction of the second shaft body 23 is disposed on the second shaft body 23, that is, the second shaft body 23 may be made into a hollow structure, one end of the first channel 232 is communicated with the liquid inlet 2613, and one end of the first channel 232 away from the liquid inlet 2613 may be used for liquid inlet, that is, high-pressure oil may flow to the liquid inlet 2613 through the first channel 232 of the second shaft body 23.

For example, referring to fig. 1, the housing 25 may include a housing body 251, a first end cap 252 and a second end cap 253, the housing body 251 is used for accommodating the first rotor 22 and the second rotor 24, the first end cap 252 is disposed on one side of the housing body 251, the second end cap 253 is disposed on the other side of the housing body 251 opposite to the one side, such as the first end cap 252 is disposed on one side of the housing body 251 close to the motor 10, the second end cap 253 is disposed on one side of the housing body 251 away from the motor 10, one end of the first shaft body 21 and one end of the second shaft body 23 are rotatably connected to the first end cap 252, the other end of the second shaft body 23 and the other end of the second shaft body 23 are rotatably connected to the second end cap 253, and the thrust bearing 27 may be disposed on the first end cap 252 or the second end cap 253.

As shown in fig. 1, in order to facilitate the flow of the liquid, the first end cap 252 is provided with a second passage 2521, the cylinder 261 is provided in the first end cap 252, the fluid inlet 2613 in the cylinder 261 is communicated with one end of the second passage 2521, and the other end of the second passage 2521 is communicated with the first passage 232 of the second shaft 23, so that the external high-pressure oil can be flowed from the first passage 232 into the second space 2612.

Since the piston 262 is pressurized by the liquid, in order to prevent the liquid from leaking out of the cylinder 261, a sealing structure may be disposed at a connection position of the first shaft body 21 and the cylinder 261, and it can be understood that the first shaft body 21 and the cylinder 261 are rotatably connected, please refer to fig. 2, and fig. 2 is a first partial schematic view of a connection position between the first shaft body and the cylinder in fig. 1. Labyrinth seal can be adopted at the joint of the first shaft body 21 and the cylinder body 261, namely a plurality of annular seal teeth 2614 which are arranged in sequence can be arranged on the cylinder body 261, a series of closure gaps and expansion cavities are formed between the teeth, and the liquid generates throttling effect when passing through the gaps of the zigzag labyrinth to achieve the purpose of leakage resistance. Of course, a plurality of annular sealing teeth 2614 arranged in sequence may be provided on the first shaft body 21. In another embodiment, please refer to fig. 3, fig. 3 is a second partial schematic view of a connection between the first shaft and the cylinder in fig. 1. A gap seal may be employed at the connection of the first shaft body 21 and the cylinder body 261, that is, a sealing function with a slight gap between the moving members. Because the clearance exists between the matching parts, the friction force is small, the heat generation is less, the service life is long, and the structure is simple and compact and the size is small because no sealing material is used. In other embodiments, please refer to fig. 4, fig. 4 is a third partial schematic view of a connection between the first shaft and the cylinder in fig. 1. The joint of the first shaft 21 and the cylinder 261 may be sealed by a sealing ring, that is, a first sealing groove 212 for installing the sealing ring 30 may be disposed on the first shaft 21, the sealing ring 30 is sleeved in the first sealing groove 212, and the sealing between the first shaft 21 and the cylinder 261 is realized by the sealing ring 30, wherein the sealing ring 30 may be an O-ring. In another embodiment, please refer to fig. 5, fig. 5 is a fourth partial schematic view of a connection between the first shaft and the cylinder in fig. 1. The connection between the first shaft 21 and the cylinder 261 may be sealed by a sliding ring, that is, the first shaft 21 may be provided with a second sealing groove 213 for installing the sliding ring 40, the sliding ring 40 is sleeved in the second sealing groove 213, and the sliding ring 40 seals the first shaft 21 and the cylinder 261.

It can be understood that, since the cylinder 261 is finally sealed in the casing 25 of the compressor 100, there may be a slight leakage at the joint of the first shaft 21 and the cylinder 261, that is, a small amount of leaked liquid enters the compressor cycle without causing a great influence on the compressor 100, and at this time, there is no great requirement for the sealing performance at the joint of the first shaft 21 and the cylinder 261.

The first shaft 21 is driven to rotate by the motor 10, and at this time, the piston 262 may be configured to rotate together with the first shaft 21, that is, the piston 262 is fixedly disposed on the first shaft 21, the piston 262 is movable relative to the cylinder 261, and in order to prevent the liquid in the second space 2612 from flowing to the first space 2611, the piston 262 is disposed in a sealed manner with the inner side wall of the cylinder 261. For example, a labyrinth seal may be used between the piston 262 and the cylinder 261, or a clearance seal may be used between the piston 262 and the cylinder 261. It is understood that there is no need for an excessive requirement for sealing between the piston 262 and the inner side wall of the cylinder 261, that is, the liquid in the second space 2612 may leak into the first space 2611 in a small amount, and as long as the leakage amount of the liquid is significantly smaller than the supply amount of the liquid, the liquid may exert sufficient pressure on the piston 262, that is, the hydraulic device 26 may act to exert a force on the piston 262 in the axial direction of the first shaft body 21 and toward a predetermined direction.

The piston 262 is fixedly disposed on the first shaft 21, and the piston 262 and the first shaft 21 are in interference fit. As shown in fig. 1, a positioning shoulder 214 may be provided on the first shaft body 21, the piston 262 may abut against the positioning shoulder 214, a fastener 50 may be provided on a side of the piston 262 facing away from the positioning shoulder 214, and the fastener 50 may fix the piston 262 to the first shaft body 21 together with the positioning shoulder 214. Wherein the fastener 50 may be a nut that is tightened onto the first shaft body 21 and that cooperates with the retaining shoulder 214 to secure the piston 262 on the first shaft body 21.

Embodiments of the present invention also provide an air conditioner including the compressor 100 as defined in combination with one or more of the above embodiments.

In the foregoing embodiments, 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 rotor assembly, the compressor and the air conditioner provided by the embodiments of the present application are described in detail, and the principles and embodiments of the present application are explained herein by applying specific examples, and the description of the embodiments is only used to help understand the method and the core idea 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:

2. The rotor assembly of claim 1, further comprising:

3. The rotor assembly according to claim 1 or 2, wherein the hydraulic device comprises a cylinder and a piston, the first shaft is arranged in the cylinder in a penetrating mode, the piston is arranged on the first shaft and located in the cylinder, the piston divides the cylinder into a first space and a second space, the second space is used for injecting liquid so that the pressure of the second space is higher than that of the first space, and the pressure difference between the second space and the first space enables the first shaft to have force along the axial direction of the first shaft and towards a preset direction.

4. The rotor assembly of claim 3 wherein the piston is configured to rotate with the first shaft, the piston being sealingly disposed with an inner sidewall of the cylinder.

5. The rotor assembly as claimed in claim 4, wherein the first shaft body is provided with a positioning shoulder, the piston abuts against the positioning shoulder, and a side of the piston facing away from the positioning shoulder is provided with a fastening member, and the fastening member and the positioning shoulder together fix the piston on the first shaft body.

6. The rotor assembly according to claim 3, wherein the cylinder body is provided with a liquid inlet, the liquid inlet is communicated with the second space, the second shaft body is provided with a first channel which is communicated along the axial direction of the second shaft body, a first end of the first channel is used for feeding liquid, and a second end of the first channel is communicated with the liquid inlet.

7. The rotor assembly of claim 3 further comprising a housing, wherein the first rotor is rotatably disposed within the housing, wherein the cylinder is fixedly disposed outside the housing, and wherein the first shaft extends out of the housing and is rotatably coupled to the cylinder.

8. The rotor assembly of claim 1 or 2, further comprising a thrust bearing disposed at one end of the first shaft body, the thrust bearing configured to limit movement of the first shaft body in a direction of the force.

9. A compressor comprising a motor and a rotor assembly as claimed in any one of claims 1 to 8, the motor being in driving connection with the first shaft.

10. An air conditioner characterized by comprising the compressor of claim 9.