CN112780561A

CN112780561A - Rotor subassembly, compressor and air conditioner

Info

Publication number: CN112780561A
Application number: CN202110221174.0A
Authority: CN
Inventors: 张治平; 龙忠铿; 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

Abstract

The embodiment of the invention discloses a rotor assembly, which comprises: a first shaft comprising an outer wall, the outer wall comprising a first surface and a second surface radially adjacent to the first surface; the radial distance from the first surface to the axis of the first shaft body is equal to the outer diameter of the first shaft body, and the radial distance from the second surface to the axis of the first shaft body is smaller than the outer diameter of the first shaft body; the first rotor is sleeved on the first shaft body; a first gap is formed between the first rotor and the outer wall of the first shaft body, and the radial section between the second surface and the first rotor is crescent. The invention also relates to a compressor and an air conditioner. The rotor assembly, the compressor and the air conditioner provided by the invention can realize lubrication between the rotor and the shaft body through one oil way, and simultaneously can simplify the structure of the rotor assembly.

Description

Rotor subassembly, compressor and air conditioner

Technical Field

The invention 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. An oil passage is provided in the compressor to supply oil from the compressor oil supply port to the screw rotor. But a plurality of oil circuits need to be arranged corresponding to a plurality of rotors in the multi-rotor compressor, so that the structure of the rotor assembly is more complex.

Disclosure of Invention

In view of this, embodiments of the present invention provide a rotor assembly, a compressor, and an air conditioner, which can implement lubrication of a plurality of rotors through one oil path, and can simplify the structure of the rotor assembly.

In order to solve the above problems, the technical scheme provided by the invention is as follows:

the present invention provides in a first aspect a rotor assembly comprising:

a first shaft comprising an outer wall, the outer wall comprising a first surface and a second surface radially adjacent the first surface; the radial distance from the first surface to the axis of the first shaft body is equal to the outer diameter of the first shaft body, and the radial distance from the second surface to the axis of the first shaft body is smaller than the outer diameter of the first shaft body; and

the first rotor is sleeved on the first shaft body; a first gap is formed between the first rotor and the outer wall of the first shaft body.

In an optional embodiment of the invention, the second surface is connected to the first surface, and a radial cross section between the second surface and the first rotor is crescent-shaped.

In an optional embodiment of the present invention, an oil inlet passage is formed inside the first shaft body, an opening of the oil inlet passage on the outer wall is disposed in the second surface, and lubricant in the oil inlet passage enters the first gap through the opening.

In an optional embodiment of the present invention, the first shaft further includes a third surface connecting the first surface and the second surface, the second surface and the third surface enclose a groove, and the groove communicates with the opening of the oil inlet passage.

In an optional embodiment of the present invention, the oil inlet passage includes a first passage axially disposed along the first shaft and at least a second passage radially disposed along the first shaft, the first passage communicates with the first gap through the second passage, an opening of the second passage on the outer wall communicates with the first gap, and a size of the second passage gradually increases along an oil outlet direction.

In an optional embodiment of the invention, the first rotor further comprises:

an air suction end face; and

at least one oil storage cavity formed by sinking from the air suction end to the interior of the first rotor; the oil storage cavity is communicated with the first gap, and the lubricant in the first gap flows into the oil storage cavity and flows out of the oil storage cavity.

In an optional embodiment of the present invention, the first rotor is further provided with at least one third channel, the oil storage cavity is communicated with the tooth space of the first rotor through the third channel, and the lubricant retained in the oil storage cavity flows into the tooth space of the first rotor through the third channel to lubricate the first rotor and the rotor engaged with the first rotor.

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

the first bearing is sleeved on the first shaft body and bears the first rotor, the first bearing and the first rotor can rotate relative to the first shaft body, and the second channel is communicated with a second gap between the first bearing and the first shaft body; a gap is formed between every two adjacent first bearings and communicated with the second channel; and a third gap is formed between the first rotor and the first bearing, the third gap is communicated with the gap, the oil storage cavity is communicated with the third gap, and the lubricant in the second gap flows into the oil storage cavity from the third gap and flows out of the oil storage cavity.

In an optional embodiment of the present invention, the first rotor further has an oil storage groove, the oil storage groove communicates with the gap, and the lubricant in the oil storage groove flows into the second gap through the gap.

a second shaft body; and

and the third rotor is sleeved on the second shaft body and meshed with the first rotor.

the second rotor is coaxial with the first rotor, the thread turning directions of the first rotor and the second rotor are opposite, and the second rotor is sleeved on the first shaft body through at least one second bearing; and

and the fourth rotor is coaxially arranged with the third rotor, and the thread directions of the third rotor and the fourth rotor are opposite.

A second aspect of the present invention provides a rotor assembly comprising:

a first shaft comprising an outer wall, the outer wall comprising a first region and a second region radially adjacent the first region, the radial force in the first region being greater than the radial force in the second region; and

at least one first rotor is sleeved on the first shaft body, and the oil inlet channel is communicated with the opening in the outer wall to form a first gap between the first rotor and the first shaft body.

In an optional embodiment of the present invention, the outer wall in the second region is a plane, and a radial cross section between the outer wall in the second region and the first rotor is crescent-shaped.

In an optional embodiment of the present invention, an oil inlet passage communicated with the first gap is formed inside the first shaft body, an opening of the oil inlet passage on the outer wall is disposed in the second region, and a lubricant in the oil inlet passage enters the first gap through the opening.

In an optional embodiment of the present invention, the oil inlet passage includes a first passage axially disposed along the first shaft and at least a second passage radially disposed along the first shaft, and the first passage communicates with the first gap through the second passage; the opening of the second channel on the outer wall is communicated with the first gap, at least one groove is formed from the outer wall of the first shaft body to the inner part of the first shaft body in a concave mode, and the groove is arranged in the second area and communicated with the second channel. In an alternative embodiment of the invention, the first rotor further comprises;

an air suction end face; and

the first bearing is sleeved on the first shaft body and bears the first rotor, the first bearing and the first rotor can rotate relative to the first shaft body, and the second channel is communicated with a second gap between the first bearing and the first shaft body; a gap is formed between every two adjacent first bearings and communicated with the second channel; and a third gap is formed between the first rotor and the first bearing, the third gap is communicated with the gap, and the lubricant in the second gap flows into the oil storage cavity from the third gap and flows out of the oil storage cavity.

A third aspect of the invention provides a compressor comprising a rotor assembly as described above.

A fourth aspect of the present invention provides an air conditioner including the compressor as described above.

According to the rotor assembly, the compressor and the air conditioner, the oil inlet channel communicated with the first gap between the first rotor and the first shaft body is arranged in the first shaft body, the opening of the oil inlet channel on the outer wall is arranged in the second area with relatively small radial force, a lubricant can enter the first gap through the opening and establish an oil film in the first area with relatively large radial force on the outer wall of the first shaft body, the oil film can bear the radial force generated in the rotation process of the rotor, so that the radial load of the rotor in the operation process can be reduced, the lubrication of the first rotor and the first shaft body is realized through the oil inlet channel, the structure of the rotor assembly is simplified, and the service life of the compressor is prolonged.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1 is a schematic structural view of a rotor assembly according to a first embodiment of the present invention;

fig. 2 is a cross-sectional view illustrating a structure of a first rotor, a first shaft, and a first bearing in the rotor assembly shown in fig. 1;

FIG. 3 is a schematic view of an exhaust end face of the rotor assembly shown in FIG. 1;

fig. 4 is a perspective view of the first shaft body shown in fig. 2.

FIG. 5 is a schematic diagram illustrating oil film pressure buildup for the rotor assembly of FIG. 1;

FIG. 6 is a schematic perspective view of the first bearing of FIG. 2;

FIG. 7 is a schematic view of a suction end face of the first rotor, the first shaft, and the first bearing of the rotor assembly shown in FIG. 2;

fig. 8 is a cross-sectional view schematically illustrating a structure of a first rotor and a first shaft body (excluding a first bearing) according to a second embodiment of the present invention.

Description of reference numerals:

100: a rotor assembly; 11: a first rotor; 111: a first tooth portion; 112: a first tooth slot; 113: a suction end face; 114: an oil storage cavity; 115: a third channel; 12: a first shaft body; 121: an outer wall; 1211: a first region; 1212: a second region; 1213: a first surface; 1214: a second surface; 1215: a third surface; 13: an oil inlet channel; 131: a first channel; 1311: an inner wall; 132: a second channel; 133: a groove; 14: a first bearing; 151, a first gap; 152: a second gap; 153: a third gap; 16: a gap; 17: an oil storage tank; 19: a second rotor; 10: a second bearing;

21: a second shaft body: 22: a third rotor; 221: a second tooth portion; 222: a second tooth slot; 20: a fourth rotor; 23: a third bearing; 24: a first bearing shell; 25: a first bearing cavity; 26: a fourth bearing; 27: a second bearing shell; 28: a second bearing cavity; 29: a rotor case; 291: a first oil return port; 292: a second oil return port;

30: an oil distributing part; 31: an oil dividing cavity; 311: a first oil inlet; 312: a first oil outlet; 313: a second oil outlet;

40: an oil guide member; 41: an oil guide cavity; 411: a second oil inlet; 412: a third oil outlet;

60: a first oil return member;

70: and a second oil return member.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention. Furthermore, it should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, and are not intended to limit the present invention. In the present invention, in the description of the present invention, without making a contrary explanation, it is to be understood that the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise. While "inner" and "outer" are with respect to the outline of the device.

The present invention may repeat reference numerals and/or letters in the various implementations, such repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed.

The embodiment of the invention provides a female rotor assembly, a compressor and an air conditioner. The following are detailed below. It should be noted that the following description of the embodiments is not intended to limit the preferred order of the embodiments.

Referring to fig. 1 and 7, a rotor assembly 100 is provided according to a first embodiment of the present invention. The rotor assembly 100 is applied to a compressor.

Referring to fig. 1 to fig. 2 again, in an alternative embodiment of the present invention, the rotor assembly 100 includes at least a first rotor 11, a first shaft 12 and at least a first bearing 14. The first rotor 11 and the first bearing 14 are sleeved on the first shaft 12, and the first bearing 14 is located between the first rotor 11 and the first shaft 12 and bears the first rotor 11. A second gap 152 is formed between the first shaft 12 and the first bearing 14. A third gap 153 is formed between the first bearing 14 and the first rotor 11.

In an alternative embodiment of the present invention, the first bearing 14 is fixedly connected to the first rotor 11, and the first rotor 11 and the first bearing 14 can rotate relative to the first shaft 12.

In an alternative embodiment of the present invention, the first bearing 14, the first shaft body 12 and the first rotor 11 form a sliding bearing structure, and an inner ring and an outer ring of the sliding bearing structure are formed between the first bearing 14 and the first shaft body 12.

In an alternative embodiment of the present invention, the first rotor 11 includes a plurality of first tooth portions 111, and a first slot 112 is formed between two adjacent first tooth portions 111.

In an alternative embodiment of the present invention, the surfaces of the first tooth portion 111 and the first slot 112 are provided with ceramic coatings for heat dissipation and friction reduction.

Referring to fig. 3, the first rotor 11 further includes a gas suction end surface 113, at least one oil storage chamber 114 is formed by recessing from the gas suction end surface 113 to the inside of the first rotor 11, the oil storage chamber 114 is communicated with the third gap 153, and the lubricant in the second gap 152 can flow into the oil storage chamber 114 from the third gap 153, and is retained in the oil storage chamber 114 or flows out from the oil storage chamber 114. Preferably, the oil storage chamber 114 is opened on the first tooth portion 111. The first rotor 11 is further provided with at least one third channel 115, and the third channel 115 is communicated with the oil storage chamber 114. The third channel 115 is disposed within the first spline 112. During the start-up of the compressor, the lubricant in the oil reservoir chamber 114 may flow into the first tooth grooves 112 of the first rotor 11 through the third passages 115 to lubricate the first rotor 11 and the third rotor 22 (see below) engaged with the first rotor 11.

Specifically, referring to fig. 2 and 4 again, the first shaft 12 is substantially cylindrical. The first shaft 12 includes an outer wall 121. An oil inlet channel 13 has been seted up to the inside of first axis body 12, oil inlet channel 13 includes one along first passageway 131 that first axis body 12 axial set up and at least one along the radial second passageway 132 that sets up of first axis body 12, first passageway 131 pass through second passageway 132 with second clearance 152 communicates.

Referring to fig. 4-5, in an alternative embodiment of the present application, the outer wall 121 includes a first region 1211 and a second region 1212 radially adjacent to the first region 1211. The radial force in the first region 1211 is greater than the radial force in the second region 1212. In fig. 4, L1 is the radial force direction, and L2 is the oil film pressure diagram. The opening of the second passage 132 on the outer wall 121 is disposed in the second region 1212, so that the lubricant in the oil inlet passage 13 enters the second gap 152 through the opening.

Specifically, referring to fig. 4, in an alternative embodiment of the present invention, a groove 133 is further formed on the outer wall 121 of the first shaft 12, and the groove 133 is formed by recessing from the outer wall 121 to the first channel 131. The groove 133 is disposed in the second region 1212 and communicates with the second channel 132 and the second gap 152.

Preferably, the number of the grooves 133 is plural, so that the lubricant can be more quickly introduced into the second gap 152, and the lubricant flowing out from the second channel 132 can more smoothly flow into the second gap 152. Preferably, the number of the grooves 133 may be set according to the number of the second channels 132.

In an alternative embodiment of the present invention, the groove 133 penetrates the outer wall 121 and has a size larger than that of the second channel 132.

Specifically, referring to fig. 5, in an alternative embodiment of the present application, the outer wall 121 located in the second region 1212 is a plane, and a radial cross section between the outer wall 121 located in the second region 1212 and the first rotor 11 is crescent-shaped.

Referring to fig. 3-4, in an alternative embodiment of the present application, the outer wall 121 further includes a first surface 1213 and a second surface 1214 radially adjacent to the first surface 1213, a radial distance from the first surface 1213 to an axis of the first shaft 12 is equal to an outer diameter of the first shaft 12, and a radial distance from the second surface 1214 to the axis of the first shaft 12 is smaller than the outer diameter of the first shaft 12. The opening of the second channel 132 in the outer wall 121 is disposed in the second surface 1214.

Specifically, referring to fig. 4, in an alternative embodiment of the present invention, the first shaft 12 further includes a third surface 1215 connecting the first surface 1213 and the second surface 1214, the second surface 1214 and the third surface 1215 define a groove 133, and the groove 133 is communicated with the second channel 132.

Specifically, referring to fig. 5, in an alternative embodiment of the present invention, the second surface 1214 is connected to the first surface 1213, and a radial cross section between the second surface 1214 and the first rotor 11 is crescent-shaped.

Referring to fig. 2-4 again, the first channel 131 penetrates the first shaft 12 along the axial direction of the first shaft 12. The first channel 131 includes an inner wall 1311. The second channel 132 passes through the inner wall 1311 and the outer wall 121. The groove 133 is concavely formed from the outer wall 121 toward the inner wall 1311.

In an alternative embodiment of the present invention, the inner wall 1311 is smooth, which reduces the resistance of the lubricant to flow in the oil inlet passage 13.

In an alternative embodiment of the present invention, the first channel 131 is a straight cylinder to prevent the freon gasification from affecting the smooth oil path.

The number of the second channels 132 may be multiple, and the second channels 132 are spaced in the first shaft body 12, so that the lubricant can enter the second gaps 15 more uniformly, and can lubricate the positions of the first shaft body 12 more uniformly. Preferably, the number of the second channels 132 may be set according to the number of the first bearings 14 and the second bearings 10, and the relationship between the number of the second channels 132 and the sum of the number of the first bearings 14 and the second bearings 10 is: assuming a total of N first bearings 14 and second bearings 10, the number of the second passages 132 needs to be greater than N-1, where N is a positive integer greater than 2.

In an alternative embodiment of the present invention, the size of the second passage 132 gradually increases along the oil outlet direction. The "oil discharge direction" herein refers to a direction from the first passage 131 to the second passage 132.

In an alternative embodiment of the present invention, the angle and size of the second channel 132 are set according to the gas force and the bearing force.

In an optional embodiment of the present invention, the outer wall 121 of the first shaft 12 is further provided with a groove 133, and the groove 133 is formed by recessing from the outer wall 121 to the inner wall 1311. The groove 133 is disposed in the second region 1212 and communicates with the second channel 132 and the second gap 152. Preferably, the number of the grooves 133 is plural, so that the lubricant can be more quickly introduced into the second gap 152, and the lubricant flowing out from the second channel 132 can more smoothly flow into the second gap 152. Preferably, the number of the grooves 133 may be set according to the number of the second channels 132. In an alternative embodiment of the present invention, the groove 133 penetrates the outer wall 121 and has a size larger than that of the second channel 132. Too large a size of the groove 133 affects the bearing capacity of the first shaft body 12, and too small a size affects the oil output amount of the lubricant, and therefore, the size of the groove 133 needs to be selected according to actual needs.

Referring to fig. 2 and 6, it should be noted that the first bearing 14 is provided with a communication hole 141, and the communication hole 141 communicates the inner surface and the outer surface of the first bearing 14 so that the lubricant can lubricate the inner surface and the outer surface of the first bearing 14. The outer wall of the first bearing 14 is further provided with a through groove 142 communicating with the communication hole 141, the through groove 142 communicates with the gap 16 between two adjacent first bearings 14, and the through groove 142 can accelerate the flow of the lubricant between the first rotor 11 and the first shaft body 12, so that the lubricant can more easily flow into the third channel 115 (see below) of the first rotor 11.

In an optional embodiment of the present invention, the length of the first bearing 14 and/or the second bearing 10 is limited, an appropriate number of the first bearing 14 and/or the second bearing 10 are provided according to the length of the first shaft 12, and a corresponding number of the second channels 132 are provided according to the number of the first bearing 14 and/or the second bearing 10.

Specifically, referring to fig. 2 again, the first rotor 11 corresponds to at least one first bearing 14. Gaps 16 are formed between two adjacent first bearings 14, and one gap 16 is communicated with one second channel 132. The other two second passages 132 correspond to one first bearing 14, respectively. In the present embodiment, each of the first rotors 11 corresponds to two first bearings 14, and two first bearings 14 correspond to three second passages 132. In other alternative embodiments, the number of the second passages 132 corresponding to two first bearings 14 is not limited to 3.

Specifically, referring to fig. 2 again, the first rotor 11 further has a plurality of oil reservoirs 17, and at least one of the oil reservoirs 17 is communicated with at least one of the gaps 16. The oil reservoir 17 contains a quantity of lubricant to provide the lubricant required by the sliding bearing arrangement during compressor start-up. During the start-up of the compressor, the lubricant in the oil storage groove 17 is squeezed into the second gap 152 through the gap 16 and the groove 133 to lubricate the first shaft 12 and the first bearing 14 and/or the second bearing 10.

Referring to fig. 1-2 again, the rotor assembly 100 further includes a second shaft 21 and at least one third rotor 22 sleeved on the second shaft 21. The third rotor 22 is positioned corresponding to and intermeshes with the first rotor 11. The third rotor 22 is sleeved on the second shaft body 21.

In an alternative embodiment of the present invention, the third rotor 22 and the second shaft body 21 are an integral structure.

In this embodiment, the third rotor 22 is a driving rotor, the first rotor 11 is a driven rotor, and the third rotor 22 drives the first rotor 11 to rotate. In other embodiments, the third rotor 22 may also be a driven rotor, the first rotor 11 is a driving rotor, and the first rotor 11 drives the third rotor 22 to rotate.

The third rotor 22 includes a plurality of second tooth portions 221, and a second tooth slot 222 is formed between any two adjacent second tooth portions 221. The second tooth portion 221 is housed in the first tooth groove 112, and the first tooth portion 111 is housed in the second tooth groove 222. Referring to fig. 2 again, in an alternative embodiment of the present invention, the rotor assembly 100 further includes a second rotor 19 disposed on the first shaft 12 and a fourth rotor 20 disposed on the second shaft 21, the second rotor 19 and the first rotor 11 have opposite screw threads, and the fourth rotor 20 and the third rotor 22 have opposite screw threads. The fourth rotor 20 meshes with the second rotor 19.

In an alternative embodiment of the present invention, the second rotor 19 is sleeved on the first shaft 12 and is rotatably connected to the first shaft 12 through a second bearing 10. The second bearing 10 is arranged in the same manner as the first bearing 14. That is, the second bearing 10 and the first shaft body 12 also have a second gap 152 therebetween. It should be noted that the second bearing 10 is also provided with a communication hole and a through groove, and the specific structure is similar to that of the communication hole and the through groove of the first bearing 14, and the detailed description is omitted here.

The first rotor 11 and the third rotor 22 generate an axial force in a first direction during compression, the second rotor 19 and the fourth rotor 20 generate an axial force in a second direction during compression, the first direction and the second direction are opposite, and the axial force in the first direction and the axial force in the second direction can at least partially cancel each other, so that the problem of excessive axial force can be solved.

It should be noted that, the first rotor 11 and the third rotor 22 generate an axial force in a first direction during the compression process, the second rotor 19 and the fourth rotor 20 generate an axial force in a second direction during the compression process, the first direction and the second direction are opposite, and if the axial force in the first direction and the axial force in the second direction are completely cancelled, the bearing for bearing the first shaft body and the second shaft body may only include a radial bearing, and no thrust bearing is provided. If the axial force remaining after the axial force in the first direction and the axial force in the second direction are partially cancelled is small, the impact of the collision of the first rotor 11 and the third rotor 22 with the rotor case 29 is also small, and the bearing that carries the first shaft body and the second shaft body may include only a radial bearing without providing a thrust bearing.

It can be understood that, because of the manufacturing process problem, the first rotor 11 and the third rotor 22 both have a certain tolerance range, which results in that the teeth of the first rotor 11 and the third rotor 22 are not completely symmetrical, and the teeth of the third rotor 22 and the fourth rotor 20 are not completely symmetrical, which further results in that the direction of the axial force after the axial force in the first direction and the axial force in the second direction are partially cancelled is uncertain, and thrust bearings in two directions need to be provided. The present embodiment may change the structure of the first rotor 11 and the second rotor 19 and/or the third rotor 22 and the fourth rotor 20, so that the axial force in one direction is constantly greater than the axial force in the other direction within the tolerance range of the first rotor 11 and the third rotor 22, the second rotor 19 and the fourth rotor 20, so that the resultant force of the axial forces generated after the first rotor and the third rotor and the second rotor and the fourth rotor are meshed to rotate is a fixed direction, and therefore, only one direction thrust bearing may be provided, and one direction thrust bearing is omitted. For example, by changing the structure of the first rotor and the third rotor so that the axial force in the first direction is greater than the axial force in the second direction. Specifically, at least one of the length, diameter, tooth density, tooth thickness and end profile of the teeth of the first rotor and the third rotor may be changed, so that the axial force in the first direction generated during the compression process is greater than the axial force in the second direction generated during the compression process of the second rotor and the fourth rotor. Thereby omitting the thrust bearings on the first shaft body and the second shaft body that correspond to the axial force in the second direction.

In an alternative embodiment of the present invention, the fourth rotor 20 is tightly fitted with the second shaft body 21.

In an alternative embodiment of the present invention, the third rotor 22 and the fourth rotor 20 are connected to the second shaft 21 through the same key (not shown), the key is used to transmit torque, the third rotor 22 drives the fourth rotor 20 to rotate, and the fourth rotor 20 drives the second rotor 19 to rotate.

Referring to fig. 1 again, in an alternative embodiment of the present invention, the rotor assembly 100 further includes a set of a third bearing 23, a first bearing housing 24, a fourth bearing 26 and a second bearing housing 27, which are disposed on the second shaft body 21, the third bearing 23 is located on the non-motor side of the corresponding compressor, the fourth bearing 26 is located on the motor side of the corresponding compressor, and the third rotor 22 is located between the third bearing 23 and the fourth bearing 26. The first bearing shell 24 has a first bearing chamber 25 which accommodates the third bearing 23. The second bearing housing 27 has a second bearing cavity 28 that accommodates the fourth bearing 26.

Referring to fig. 1 again, in an alternative embodiment of the present invention, the rotor assembly 100 further includes an oil separating member 30 located on a side of the third bearing 23 away from the third rotor 22. The oil distributing member 30 includes a first oil distributing chamber 31. The first oil-dividing chamber 31 is respectively communicated with the first passage 131 and the first bearing chamber 25. After the lubricant is separated by the oil separating member 30, a part of the lubricant flows into the first channel 131 and enters the second gap 152 through the second channel 132 to lubricate the first shaft 12 and the first bearing 14 and/or the second bearing 10; another portion of the lubricant flows into the first bearing cavity 25 to lubricate the third bearing 23.

In this embodiment, the oil-dividing chamber 31 further includes a first oil inlet 311, a first oil outlet 312 and a second oil outlet 313, the first oil inlet 311 is communicated with the first oil outlet 312 and the second oil outlet 313, the first oil outlet 312 is communicated with the first channel 131, and the second oil outlet 313 is communicated with the first bearing chamber 25. The lubricant enters the oil-dividing chamber 31 from the first oil inlet 311, enters the first channel 131 from the first oil outlet 312, and enters the first bearing chamber 25 from the second oil outlet 313.

Of course, in other embodiments, the first oil inlet 311 may not be disposed as a part of the oil-dividing chamber 31, but may be disposed separately from the first oil outlet 312 and the second oil outlet 313.

In this embodiment, the oil separating member 30 further has a throttle plug thereon or the oil separating member 30 itself is a throttle plug with a flow dividing function, so as to control the amount of lubricant entering the first bearing cavity 25.

Referring to fig. 1 again, in an alternative embodiment of the present invention, the rotor assembly 100 further includes an oil guiding member 40 located on a side of the fourth bearing 26 away from the fourth rotor 20, and the oil guiding member 40 includes an oil guiding cavity 41. The oil guide chamber 41 is respectively communicated with the first channel 131 and the second bearing chamber 28. Specifically, the oil distributing member 30 and the oil guiding member 40 are respectively located at two ends of the first shaft 12 along the axial direction thereof. Part of the lubricant flows into the oil guide chamber 41 from the first passage 131, and then flows into the second bearing chamber 28 from the oil guide chamber 41 to lubricate the fourth bearing 26.

In this embodiment, the oil guide 40 further has a choke plug thereon or the oil guide 40 itself is a choke plug with a flow dividing function to control the amount of lubricant entering the second bearing cavity 28.

In this embodiment, the oil guide cavity 41 further includes a second oil inlet 411 and a third oil outlet 412 communicating with the second oil inlet 411, the second oil inlet 411 is communicated with the first channel 131, and the third oil outlet 412 is communicated with the second bearing cavity 28.

Referring to fig. 1 and 7, in an alternative embodiment of the present invention, the rotor assembly 100 further includes a rotor housing 29, and the first rotor 11, the second rotor 19, the third rotor 22 and the fourth rotor 20 are accommodated in the rotor housing 29.

In an alternative embodiment of the present invention, the rotor case 29 includes a first oil return port 291 and a second oil return port 292, the first oil return port 291 is formed on an end surface of the rotor case 29 facing the third bearing 23 and is communicated with the second tooth groove 222, and the second oil return port 292 is formed on an end surface of the rotor case 29 facing the fourth bearing 26 and is communicated with the tooth groove of the fourth rotor 20.

In another optional embodiment of the present invention, the first oil return opening 291 and the second oil return opening 292 may also be both communicated with the second tooth slot 222 of the third rotor 22 or the tooth slot of the fourth rotor 20.

In yet another alternative embodiment of the present invention, the rotor case 29 may further include only one first oil return port 291 or one second oil return port 292.

In an alternative embodiment of the present invention, the rotor assembly 100 further includes a first oil return member 60 connecting the first bearing housing 24 and the first oil return port 291, and the first oil return member 60 includes a first oil return chamber (not shown). One end of the first oil return cavity is communicated with the first bearing cavity 25, and the other end is communicated with the first oil return hole 291. The lubricant flowing out of the first bearing cavity 25 flows into the volume between the first rotor 11 and the third rotor 22 engaged with each other and/or the volume between the second rotor 19 and the fourth rotor 20 engaged with each other, that is, into the tooth grooves 222 or the tooth grooves of the fourth rotor 20 through the first oil return cavity and the first oil return hole 291, so as to lubricate the first rotor 11 and the third rotor 22 and/or the second rotor 19 and the fourth rotor 20 engaged with each other.

In an alternative embodiment of the present invention, the rotor assembly 100 further includes a second oil return member 70 connected to the fourth bearing 26 and the second oil return opening 292, and the second oil return member 70 includes a second oil return chamber (not shown). One end of the second oil return cavity is communicated with the second bearing cavity 28, and the other end of the second oil return cavity is communicated with the second oil return hole 292. The lubricant flowing out of the second bearing chamber 28 flows into the tooth grooves of the fourth rotor 20 or the second tooth grooves 222 through the first oil return chamber and the first oil return port 291.

In an embodiment of the present application, the second oil return member 70 may also be directly connected to the oil guide member 40, and the second oil return chamber is communicated with the second bearing chamber 28 through the oil guide chamber 41. At this time, the oil guide 40 has a flow dividing function.

In an alternative embodiment of the present invention, the lubricant is a refrigeration oil, which not only lubricates the rotor assembly 100, but also dissipates heat and cools.

For ease of understanding, the rotor assembly 100 may have an oil path, as shown in fig. 1, and the arrows shown in fig. 1 indicate the flow direction of the lubricant. The lubricant can complete bearing oil supply of the first rotor 11 and bearing lubrication oil supply of the left and right sides of the third rotor 22 through the first oil inlet 311. The lubricant having finished the bearing lubrication eventually enters the inter-rotor volume to lubricate the meshing portions of the first rotor 11 and the third rotor 22. The flow path of the lubricant may include three oil paths:

the first oil path includes: a first oil inlet 311, a main oil path formed by the first channel 131 in the first shaft 12, a branch oil path formed by the second channel 132 in the first shaft 12, a second gap 152 between the first bearing 14 and the first rotor 11, a third gap 153, and an oil storage cavity 114.

The second oil path includes: the first oil inlet 311, the oil separating cavity 31 in the first oil separating member 30, the first bearing cavity 25, the first oil returning cavity in the first oil returning member 60, the first oil returning hole 291 and the inter-tooth volume of the rotor.

The third oil path includes: the first channel 131, the oil guide cavity 41 in the oil guide 40, the second bearing cavity 28, the second oil return cavity in the second oil return member 70, the second oil return opening 292 and the rotor tooth space volume. Lubrication of the first rotor, the second rotor and all bearings can be achieved via a first oil inlet 311.

The first oil path, the second oil path, and the third oil path may exist respectively, or any two oil paths or three oil paths may exist simultaneously.

Referring to fig. 8, a second embodiment of the present invention provides a rotor assembly, which has a similar structure to the rotor assembly 100, except that: the rotor assembly does not include the first bearing 14 and the second bearing 10. In the second embodiment of the present invention, the first rotor 11 of the rotor assembly is directly sleeved on the first shaft 12 of the rotor assembly and can rotate relative to the first shaft 12, and the lubricant flowing out of the second channel 132 enters the first gap 151 between the first shaft 12 and the first rotor 11.

In an alternative embodiment of the present invention, the first rotor 11 is made of a self-lubricating non-metallic material, and the first shaft body 12 is made of a hard alloy material.

In an alternative embodiment of the present invention, the first rotor 11 is made of a hard alloy material, and the first shaft body 12 is made of a self-lubricating non-metallic material.

In an alternative embodiment of the present invention, the third rotor 22 is formed of forged steel or cast iron. When the first rotor 11 is made of a self-lubricating non-metallic material and the third rotor 22 is made of forged steel or cast iron, the first rotor 11 and the third rotor 22 are engaged with each other by the metal and the non-metallic material, so that the smoothness of transmission is improved, and the vibration and noise in the operation process of the compressor are reduced.

In an alternative embodiment of the present invention, the third rotor 22 may also be made of a self-lubricating non-metallic material. When the first rotor 11 is made of hard alloy steel material and the second rotor is made of self-lubricating non-metallic material, the first rotor 11 and the third rotor 22 are in meshed motion of metal and non-metallic material, so that the smoothness of transmission is improved, and vibration and noise in the running process of the compressor are reduced.

In an alternative embodiment of the present invention, the first rotor 11 may be made of a hard alloy steel material, and the third rotor 22 may be made of a forged steel or a cast iron material.

Embodiments of the present invention also provide a compressor, which may be a screw compressor, such as an opposed screw compressor. It should be noted that the compressor related to the present invention is not limited to the screw compressor, and the compressor may be a scroll compressor.

The compressor includes a rotor assembly as defined above in combination with one or more of the embodiments.

The compressor further comprises a motor, the motor drives the second shaft body 21, the second shaft body 21 drives the third rotor 22, and the third rotor 22 drives the first rotor 11.

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

The invention provides a rotor assembly, a compressor and an air conditioner, wherein 1) at least one second channel communicated with a second gap and a first gap is formed on a first shaft body, an opening of the second channel on the outer wall of the first shaft body is arranged in a second area with relatively small radial force on the outer wall of the first shaft body, a lubricant can smoothly flow into the second gap and the first gap through the first channel and the second channel, an oil film is established in a first area with relatively large radial force on the outer wall of the first shaft body, and the oil film can bear the radial force generated in the rotating process of a first rotor, so that the radial load of the first rotor in the operating process can be reduced, the first rotor and the first shaft body are lubricated, friction is reduced, and the operating life of the compressor is prolonged; 2) an oil distributing part or an oil guiding part is arranged between the first channel of the first shaft body and the first bearing cavity or the second bearing cavity, lubricant can enter the corresponding bearing cavity through the oil distributing part or the oil guiding part so as to lubricate the third bearing and the fourth bearing, and the oil guiding part and the oil distributing part can also control the amount of the lubricant entering the first bearing cavity and the second bearing cavity; 3) a first oil return port or a second oil return port communicated with a tooth groove of the third rotor or the fourth rotor is formed in one side, facing the third bearing or the fourth bearing, of a rotor shell containing the first rotor and the second rotor, and a first oil return part or a second oil return part is arranged, so that the lubricant is guided to the volumes of the rotors meshed with each other, the rotors meshed with each other can be lubricated, and the risk of tooth crest leakage of the third rotor and the fourth rotor can be reduced. 4) The oil circuit structure of the rotor assembly provided by the invention is composed of an oil inlet channel, an oil guide part, an oil distribution part, a first bearing cavity, a second bearing cavity, a first oil return part, a second oil return part, a first oil return port, a second oil return port and volumes among mutually meshed rotors, is compact in structure, and can simultaneously complete lubricating oil supply to bearings at two sides of a third rotor and a fourth rotor, lubricating oil supply to a first shaft body and a first bearing or between the first rotor and the first shaft body and lubricating oil supply to the mutually meshed rotors.

The above embodiments of the present invention provide a rotor assembly, a compressor and an air conditioner, and the principles and embodiments of the present invention are explained herein by using specific examples, and the above embodiments are only used to help understand the method and the core idea of the present invention; meanwhile, for those skilled in the art, according to the idea of the present invention, 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 invention.

Claims

1. A rotor assembly, characterized in that the rotor assembly comprises:

2. The rotor assembly of claim 1 wherein the second surface is connected to the first surface, and wherein a radial cross-section between the second surface and the first rotor is crescent-shaped.

3. The rotor assembly of claim 1 wherein the first shaft body defines an oil inlet passage therein, the oil inlet passage defining an opening in the outer wall disposed in the second surface, lubricant in the oil inlet passage entering the first gap through the opening.

4. The rotor assembly of claim 3 wherein said first shaft further comprises a third surface connecting said first surface and said second surface, said second surface and said third surface defining a recess, said recess communicating with said opening of said oil inlet passage.

5. The rotor assembly of claim 3 wherein the oil inlet passage comprises a first passage disposed axially along the first shaft and at least a second passage disposed radially along the first shaft, the first passage communicating with the first gap through the second passage, the second passage opening in the outer wall communicating with the first gap, the second passage increasing in size in the direction of oil production.

6. The rotor assembly of claim 5 wherein the first rotor further comprises:

an air suction end face; and

7. The rotor assembly as claimed in claim 6, wherein the first rotor further defines at least one third channel, the oil reservoir is communicated with the tooth space of the first rotor through the third channel, and the lubricant retained in the oil reservoir flows into the tooth space of the first rotor through the third channel to lubricate the first rotor and the rotor engaged with the first rotor.

8. The rotor assembly of claim 6, further comprising:

9. The rotor assembly as claimed in claim 8, wherein the first rotor further defines a reservoir, the reservoir communicating with the gap, and lubricant in the reservoir flowing into the second gap through the gap.

10. A rotor assembly as claimed in any one of claims 1 to 9, further comprising:

a second shaft body; and

11. The rotor assembly of claim 10, further comprising:

12. A rotor assembly, characterized in that the rotor assembly comprises:

13. The rotor assembly of claim 12 wherein said outer wall in said second region is planar and a radial cross-section between said outer wall in said second region and said first rotor is crescent-shaped.

14. The rotor assembly of claim 12 wherein the first shaft body defines an oil inlet passage therein that communicates with the first gap, the oil inlet passage having an opening in the outer wall disposed in the second region, the lubricant in the oil inlet passage entering the first gap through the opening.

15. The rotor assembly of claim 14 wherein the oil inlet passage comprises a first passage disposed axially along the first shaft and at least a second passage disposed radially along the first shaft, the first passage communicating with the first gap through the second passage; the opening of the second channel on the outer wall is communicated with the first gap, at least one groove is formed from the outer wall of the first shaft body to the inner part of the first shaft body in a concave mode, and the groove is arranged in the second area and communicated with the second channel.

16. The rotor assembly of claim 15 wherein the first rotor further comprises:

an air suction end face; and

17. The rotor assembly of claim 16, further comprising:

the first bearing is sleeved on the first shaft body and bears the first rotor, the first bearing and the first rotor can rotate relative to the first shaft body, and the second channel is communicated with a second gap between the first bearing and the first shaft body; a third gap is arranged between the first rotor and the first bearing and is communicated with the gap; the first rotor further includes:

an air suction end face;

at least one oil storage cavity formed by sinking from the air suction end to the interior of the first rotor; the oil storage cavity is communicated with the third gap, and the lubricant in the second gap flows into the oil storage cavity from the third gap and flows out of the oil storage cavity.

18. A compressor, characterized in that it comprises a rotor assembly as claimed in any one of claims 1 to 17.

19. An air conditioner characterized in that it comprises a compressor according to claim 18.