Rotor assemblies, compressors and air conditioners

Abstract

The embodiment of the present invention discloses a rotor assembly, comprising: a first shaft body, 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 less than the outer diameter of the first shaft body; and a first rotor, sleeved on the first shaft body; a first gap is provided between the first rotor and the outer wall of the first shaft body, and the radial cross section between the second surface and the first rotor is crescent-shaped. The present invention also relates to a compressor and an air conditioner. The rotor assembly, compressor and air conditioner provided by the present invention can achieve lubrication between the rotor and the shaft body through an oil circuit, and can simplify the structure of the rotor assembly.

Description

Technical Field

[0001] The present invention relates to the technical field of compressors, and in particular to a rotor assembly, a compressor and an air conditioner. Background Art

[0002] The compressor is generally provided with a pair of parallel helical rotors, which are placed in the space volume of the screw compressor shell. During the rotation of the pair of helical rotors, the space volume will increase and decrease periodically, so that the space volume is periodically connected and closed with the air inlet and the exhaust port, and the process of suction, compression and exhaust can be completed. An oil circuit is provided in the compressor to supply oil from the oil supply port of the compressor to the helical rotor. However, multiple oil circuits need to be provided for multiple rotors in a multi-rotor compressor, making the structure of the rotor assembly more complicated. Summary of the invention

[0003] In view of this, an embodiment of the present invention provides a rotor assembly, a compressor and an air conditioner, which can achieve lubrication of multiple rotors through one oil circuit and simplify the structure of the rotor assembly.

[0004] To solve the above problems, the technical solution provided by the present invention is as follows:

[0005] A first aspect of the present invention provides a rotor assembly, the rotor assembly comprising:

[0006] a first shaft body, comprising an outer wall, wherein the outer wall comprises a first surface and a second surface radially adjacent to the first surface; a radial distance from the first surface to the axis of the first shaft body is equal to an outer diameter of the first shaft body, and a radial distance from the second surface to the axis of the first shaft body is less than the outer diameter of the first shaft body; and

[0007] At least one 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.

[0008] In an optional embodiment of the present 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.

[0009] In an optional embodiment of the present invention, an oil inlet channel is provided inside the first shaft body, an opening of the oil inlet channel on the outer wall is arranged in the second surface, and the lubricant in the oil inlet channel enters the first gap through the opening.

[0010] In an optional embodiment of the present invention, the first shaft body further includes a third surface connecting the first surface and the second surface, the second surface and the third surface form a groove, and the groove is connected to the opening of the oil inlet channel.

[0011] In an optional embodiment of the present invention, the oil inlet channel includes a first channel arranged axially along the first shaft body and at least one second channel arranged radially along the first shaft body, the first channel is connected to the first gap through the second channel, the opening of the second channel on the outer wall is connected to the first gap, and the size of the second channel gradually increases along the oil outlet direction.

[0012] In an optional embodiment of the present invention, the first rotor further comprises:

[0013] a suction end surface; and

[0014] At least one oil storage cavity is formed by being recessed from the suction end surface toward 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 from the oil storage cavity.

[0015] In an optional embodiment of the present invention, at least one third channel is further provided on the first rotor, and the oil storage chamber is connected with the tooth grooves of the first rotor through the third channel. The lubricant retained in the oil storage chamber flows into the tooth grooves of the first rotor through the third channel to lubricate the first rotor and the rotor meshing with the first rotor.

[0016] In an optional embodiment of the present invention, the rotor assembly further comprises:

[0017] At least one first bearing is sleeved on the first shaft and carries the first rotor, the first bearing and the first rotor can rotate relative to the first shaft, the second channel is connected to the second gap between the first bearing and the first shaft; there is a gap between two adjacent first bearings, and the gap is connected to the second channel; there is a third gap between the first rotor and the first bearing, the third gap is connected to the gap, the oil storage chamber is connected to the third gap, and the lubricant in the second gap flows from the third gap into the oil storage chamber and flows out of the oil storage chamber.

[0018] In an optional embodiment of the present invention, an oil storage tank is further provided on the first rotor, the oil storage tank is connected to the gap, and the lubricant in the oil storage tank flows into the second gap through the gap.

[0019] In an optional embodiment of the present invention, the rotor assembly further comprises:

[0020] a second shaft; and

[0021] A third rotor is sleeved on the second shaft, and the third rotor is meshed with the first rotor.

[0022] In an optional embodiment of the present invention, the rotor assembly further comprises:

[0023] a second rotor, coaxially arranged with the first rotor, the first rotor and the second rotor having opposite thread directions, and the second rotor being sleeved on the first shaft through at least one second bearing; and

[0024] A fourth rotor is coaxially arranged with the third rotor, and the thread rotation directions of the third rotor and the fourth rotor are opposite.

[0025] A second aspect of the present invention provides a rotor assembly, the rotor assembly comprising:

[0026] A first shaft body, comprising an outer wall, wherein the outer wall comprises a first region and a second region radially adjacent to the first region, wherein a radial force in the first region is greater than a radial force in the second region; and

[0027] At least one first rotor is sleeved on the first shaft body, and the opening of the oil inlet channel on the outer wall is connected to the first gap between the first rotor and the first shaft body.

[0028] In an optional embodiment of the present invention, the outer wall located in the second area is a plane, and a radial cross-section between the outer wall located in the second area and the first rotor is crescent-shaped.

[0029] In an optional embodiment of the present invention, an oil inlet channel connected to the first gap is opened inside the first shaft, and the opening of the oil inlet channel on the outer wall is arranged in the second area. The lubricant in the oil inlet channel enters the first gap through the opening.

[0030] In an optional embodiment of the present invention, the oil inlet channel includes a first channel arranged along the axial direction of the first shaft body and at least one second channel arranged along the radial direction of the first shaft body, the first channel is connected to the first gap through the second channel; the second channel is connected to the first gap through the opening on the outer wall, and at least one groove is formed from the outer wall of the first shaft body to the inside of the first shaft body, and the groove is arranged in the second area and connected to the second channel. In an optional embodiment of the present invention, the first rotor also includes;

[0031] a suction end surface; and

[0032] At least one oil storage cavity is formed by being recessed from the suction end surface toward 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 from the oil storage cavity.

[0033] In an optional embodiment of the present invention, the rotor assembly further comprises:

[0034] At least one first bearing is sleeved on the first shaft and carries the first rotor, the first bearing and the first rotor can rotate relative to the first shaft, the second channel is connected to the second gap between the first bearing and the first shaft; there is a gap between two adjacent first bearings, and the gap is connected to the second channel; there is a third gap between the first rotor and the first bearing, and the third gap is connected to the gap, and the lubricant in the second gap flows from the third gap into the oil storage cavity and flows out of the oil storage cavity.

[0035] A third aspect of the present invention provides a compressor, comprising the rotor assembly as described above.

[0036] A fourth aspect of the present invention provides an air conditioner, comprising the compressor as described above.

[0037] The rotor assembly, compressor and air conditioner provided by the present invention have an oil inlet channel connected to the first gap between the first rotor and the first shaft body inside the first shaft body, and the opening of the oil inlet channel on the outer wall is set in the second area where the radial force is relatively small. The lubricant can enter the first gap through the opening and establish an oil film in the first area where the radial force is relatively large on the outer wall of the first shaft body. The oil film can withstand the radial force generated during the rotation of the rotor, thereby reducing the radial load of the rotor during operation. Lubrication of the first rotor and the first shaft body is achieved through an oil inlet channel, which simplifies the structure of the rotor assembly and improves the operating life of the compressor. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0039] Figure 1 is a schematic structural diagram of a rotor assembly provided by a first embodiment of the present invention;

[0040] Figure 2 yes Figure 1 A schematic cross-sectional view of a structure consisting of a first rotor, a first shaft and a first bearing in the rotor assembly shown;

[0041] Figure 3 yes Figure 1 A schematic diagram of the exhaust end face of the rotor assembly shown;

[0042] Figure 4 yes Figure 2 A three-dimensional schematic diagram of the first axis;

[0043] Figure 5 yes Figure 1 A schematic diagram of the formation of oil film pressure of the rotor assembly;

[0044] Figure 6 yes Figure 2 A three-dimensional schematic diagram of the first bearing;

[0045] Figure 7 yes Figure 2 A schematic diagram of the suction end surface of the first rotor, the first shaft and the first bearing of the rotor assembly shown;

[0046] Figure 8 It is a cross-sectional schematic diagram of a structure consisting of a first rotor and a first shaft (excluding a first bearing) provided in a second embodiment of the present invention.

[0047] Description of reference numerals:

[0048] 100: rotor assembly; 11: first rotor; 111: first tooth portion; 112: first tooth groove; 113: suction end surface; 114: oil storage chamber; 115: third channel; 12: first shaft body; 121: outer wall; 1211: first area; 1212: second area; 1213: first surface; 1214: second surface; 1215: third surface; 13: oil inlet channel; 131: first channel; 1311: inner wall; 132: second channel; 133: groove; 14: first bearing; 151: first gap; 152: second gap; 153: third gap; 16: gap; 17: oil storage tank; 19: second rotor; 10: second bearing;

[0049] 21: second shaft body; 22: third rotor; 221: second tooth portion; 222: second tooth groove; 20: fourth rotor; 23: third bearing; 24: first bearing shell; 25: first bearing cavity; 26: fourth bearing; 27: second bearing shell; 28: second bearing cavity; 29: rotor shell; 291: first oil return port; 292: second oil return port;

[0050] 30: oil distributor; 31: oil distributor chamber; 311: first oil inlet; 312: first oil outlet; 313: second oil outlet;

[0051] 40: oil guide member; 41: oil guide chamber; 411: second oil inlet; 412: third oil outlet;

[0052] 60: First oil return piece;

[0053] 70: Second oil return part. DETAILED DESCRIPTION

[0054] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention. In addition, it should be understood that the specific implementation methods described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention. In the present invention, unless otherwise specified, in the description of the present invention, it should be understood that the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined. "Inside" and "outside" refer to the outline of the device.

[0055] The present invention may repeat reference numerals and / or reference letters in different embodiments. Such repetition is for the purpose of simplicity and clarity and does not in itself indicate the relationship between the various embodiments and / or settings discussed.

[0056] The embodiments of the present invention provide a female rotor assembly, a compressor and an air conditioner. The embodiments are described in detail below. It should be noted that the description order of the following embodiments is not intended to limit the preferred order of the embodiments.

[0057] See also Figure 1 and Figure 7 A first embodiment of the present invention provides a rotor assembly 100. The rotor assembly 100 is applied to a compressor.

[0058] Please refer again Figure 1 to Figure 2 In an optional embodiment of the present invention, the rotor assembly 100 includes at least one first rotor 11, a first shaft 12, and at least one 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 carries the first rotor 11. There is a second gap 152 between the first shaft 12 and the first bearing 14. There is a third gap 153 between the first bearing 14 and the first rotor 11.

[0059] In an optional 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 .

[0060] In an optional embodiment of the present invention, the first bearing 14 , the first shaft 12 and the first rotor 11 constitute a sliding bearing structure, and the first bearing 14 and the first shaft 12 form inner and outer rings of the sliding bearing structure.

[0061] In an optional embodiment of the present invention, the first rotor 11 includes a plurality of first tooth portions 111 , and a first tooth groove 112 is formed between two adjacent first tooth portions 111 .

[0062] In an optional embodiment of the present invention, the surfaces of the first tooth portion 111 and the first tooth groove 112 are provided with a ceramic coating for heat dissipation and friction reduction.

[0063] See also Figure 3 The first rotor 11 further includes an air intake end surface 113, which is recessed from the air intake end surface 113 to the inside of the first rotor 11 to form at least one oil storage cavity 114, and the oil storage cavity 114 is connected to the third gap 153. The lubricant in the second gap 152 can flow from the third gap 153 into the oil storage cavity 114, and remain in the oil storage cavity 114 or flow out from the oil storage cavity 114. Preferably, the oil storage cavity 114 is provided on the first tooth portion 111. The first rotor 11 is also provided with at least one third channel 115, and the third channel 115 is connected to the oil storage cavity 114. The third channel 115 is provided in the first tooth groove 112. During the start-up process of the compressor, the lubricant in the oil storage cavity 114 can flow into the first tooth groove 112 of the first rotor 11 through the third channel 115 to lubricate the first rotor 11 and the third rotor 22 (see below) meshing with the first rotor 11.

[0064] For details, please refer again to Figure 2 and Figure 4 The first shaft body 12 is substantially cylindrical. The first shaft body 12 includes an outer wall 121. An oil inlet channel 13 is provided inside the first shaft body 12. The oil inlet channel 13 includes a first channel 131 arranged along the axial direction of the first shaft body 12 and at least one second channel 132 arranged along the radial direction of the first shaft body 12. The first channel 131 is connected to the second gap 152 through the second channel 132.

[0065] See also Figure 4-5In an optional 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. Figure 4 L1 is the radial force direction, and L2 is a schematic diagram of oil film pressure. The opening of the second channel 132 on the outer wall 121 is arranged in the second region 1212 so that the lubricant in the oil inlet channel 13 enters the second gap 152 through the opening.

[0066] Specifically, see Figure 4 In an optional embodiment of the present invention, a groove 133 is further formed on the outer wall 121 of the first shaft body 12, and the groove 133 is formed by being recessed from the outer wall 121 toward the first channel 131. The groove 133 is disposed in the second region 1212 and connects the second channel 132 and the second gap 152.

[0067] Preferably, the number of the grooves 133 is plural, so that the lubricant can enter the second gap 152 faster, so that the lubricant flowing out of the second channel 132 can flow more smoothly into the second gap 152. Preferably, the number of the grooves 133 can be set according to the number of the second channels 132.

[0068] In an optional embodiment of the present invention, the groove 133 passes through the outer wall 121 and has a size greater than that of the second channel 132 .

[0069] Specifically, see Figure 5 In an optional embodiment of the present application, the outer wall 121 located in the second area 1212 is a plane, and the radial cross-section between the outer wall 121 located in the second area 1212 and the first rotor 11 is crescent-shaped.

[0070] See also Figure 3-4 In an optional 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, the radial distance from the first surface 1213 to the axis of the first shaft body 12 is equal to the outer diameter of the first shaft body 12, and the radial distance from the second surface 1214 to the axis of the first shaft body 12 is less than the outer diameter of the first shaft body 12. The opening of the second channel 132 on the outer wall 121 is arranged in the second surface 1214.

[0071] Specifically, see Figure 4In an optional embodiment of the present invention, the first shaft body 12 also includes a third surface 1215 connecting the first surface 1213 and the second surface 1214 , and the second surface 1214 and the third surface 1215 form a groove 133 , and the groove 133 is connected to the second channel 132 .

[0072] Specifically, see Figure 5 In an optional embodiment of the present invention, the second surface 1214 is connected to the first surface 1213, and the radial cross-section between the second surface 1214 and the first rotor 11 is crescent-shaped.

[0073] Please refer again Figure 2-4 The first channel 131 penetrates the first shaft body 12 along the axial direction of the first shaft body 12. The first channel 131 includes an inner wall 1311. The second channel 132 penetrates the inner wall 1311 and the outer wall 121. The groove 133 is formed by being recessed from the outer wall 121 to the inner wall 1311.

[0074] In an optional embodiment of the present invention, the inner wall 1311 is smooth, which can reduce the resistance of the lubricant when it flows in the oil inlet channel 13.

[0075] In an optional embodiment of the present invention, the first channel 131 is in a straight cylindrical shape to prevent the gasification of Freon from affecting the smoothness of the oil circuit.

[0076] The number of the second channels 132 may be multiple, and the multiple second channels 132 are arranged at intervals in the first shaft body 12, so that the lubricant can enter each position of the second gap 15 more evenly, and lubricate each position of the first shaft body 12 more evenly. Preferably, the number of the second channels 132 can 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 that there are N first bearings 14 and second bearings 10 in total, the number of the second channels 132 needs to be greater than N-1, wherein N is a positive integer greater than 2.

[0077] In an optional embodiment of the present invention, the size of the second channel 132 gradually increases along the oil outlet direction. Here, the “oil outlet direction” refers to the direction from the first channel 131 to the second channel 132 .

[0078] In an optional embodiment of the present invention, the angle and size of the second channel 132 are set according to the gas force and the bearing capacity.

[0079] In an optional embodiment of the present invention, a groove 133 is further provided on the outer wall 121 of the first shaft body 12, and the groove 133 is formed by being recessed from the outer wall 121 to the inner wall 1311. The groove 133 is arranged in the second area 1212 and connects the second channel 132 and the second gap 152. Preferably, there are multiple grooves 133, which can allow the lubricant to enter the second gap 152 faster, so that the lubricant flowing out of the second channel 132 can flow into the second gap 152 more smoothly. Preferably, the number of the grooves 133 can be set according to the number of the second channels 132. In an optional embodiment of the present invention, the groove 133 runs through the outer wall 121 and its size is larger than the size of the second channel 132. If the size of the groove 133 is too large, it will affect the bearing capacity of the first shaft body 12, and if it is too small, it will affect the oil output of the lubricant. Therefore, the size of the groove 133 needs to be selected according to actual needs.

[0080] See also Figure 2 and Figure 6 It should be noted that the first bearing 14 is provided with a connecting hole 141, and the connecting hole 141 connects 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 also provided with a through groove 142 connected with the connecting hole 141, and the through groove 142 is connected with the gap 16 between two adjacent first bearings 14. The through groove 142 can accelerate the flow of lubricant between the first rotor 11 and the first shaft body 12, so that the lubricant can flow more easily into the third channel 115 (see below) of the first rotor 11.

[0081] In an optional embodiment of the present invention, the length of the first bearing 14 and / or the second bearing 10 is limited, and an appropriate number of the first bearings 14 and / or the second bearings 10 are set according to the length of the first shaft 12, and a corresponding number of the second channels 132 are opened according to the number of the first bearings 14 and / or the second bearings 10.

[0082] For details, please refer again to Figure 2 , the first rotor 11 corresponds to at least one first bearing 14. There is a gap 16 between two adjacent first bearings 14, and one of the gaps 16 is connected to one of the second channels 132. The other two second channels 132 correspond to one of the first bearings 14, respectively. In this embodiment, each of the first rotors 11 corresponds to two of the first bearings 14, and two of the first bearings 14 correspond to three of the second channels 132. In other optional embodiments, the number of the second channels 132 corresponding to the two first bearings 14 is not limited to three.

[0083] For details, please refer again to Figure 2 The first rotor 11 is also provided with a plurality of oil storage tanks 17, at least one of which is in communication with at least one of the gaps 16. A certain amount of lubricant is stored in the oil storage tank 17 to provide lubricant required by the sliding bearing structure during the compressor startup process. During the compressor startup process, the lubricant in the oil storage tank 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.

[0084] Please refer again Figure 1-2 The rotor assembly 100 further includes a second shaft 21 and at least one third rotor 22 mounted on the second shaft 21. The third rotor 22 corresponds to the first rotor 11 and meshes with each other. The third rotor 22 is mounted on the second shaft 21.

[0085] In an optional embodiment of the present invention, the third rotor 22 and the second shaft body 21 are an integrated structure.

[0086] In this embodiment, the third rotor 22 is an active 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 an active rotor, and the first rotor 11 drives the third rotor 22 to rotate.

[0087] The third rotor 22 includes a plurality of second teeth 221, and a second tooth slot 222 is formed between any two adjacent second teeth 221. The second teeth 221 are received in the first tooth slot 112, and the first teeth 111 are received in the second tooth slot 222. Figure 2 In an optional 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 has a thread rotation direction opposite to that of the first rotor 11, and the fourth rotor 20 has a thread rotation direction opposite to that of the third rotor 22. The fourth rotor 20 is meshed with the second rotor 19.

[0088] In an optional embodiment of the present invention, the second rotor 19 is sleeved on the first shaft body 12 and is rotatably connected to the first shaft body 12 through a second bearing 10. The second bearing 10 is arranged in the same manner as the first bearing 14. That is, there is also a second gap 152 between the second bearing 10 and the first shaft body 12. It should be noted that the second bearing 10 is also provided with a connecting hole and a through groove, and the specific structure is similar to the structure of the connecting hole and the through groove of the first bearing 14, which will not be repeated here.

[0089] The first rotor 11 and the third rotor 22 generate an axial force in a first direction during compression, and 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 offset each other, thereby improving the problem of excessive axial force.

[0090] It should be noted that the first rotor 11 and the third rotor 22 generate an axial force in a first direction during compression, and the second rotor 19 and the fourth rotor 20 generate an axial force in a second direction during compression, and the first direction and the second direction are opposite. If the axial force in the first direction and the axial force in the second direction are completely offset, the bearings supporting the first shaft body and the second shaft body may only include radial bearings, and no thrust bearing is provided. If the remaining axial force after the axial force in the first direction and the axial force in the second direction are partially offset is very small, the impact of the collision between the first rotor 11 and the third rotor 22 and the rotor shell 29 is also very small, and the bearings supporting the first shaft body and the second shaft body may only include radial bearings, and no thrust bearing is provided.

[0091] It is understandable that due to manufacturing process problems, the first rotor 11 and the third rotor 22 have a certain tolerance range, resulting in the teeth of the first rotor 11 and the third rotor 22 not being completely symmetrical, and the teeth of the third rotor 22 and the fourth rotor 20 not being completely symmetrical, which in turn results in the direction of the axial force after the axial force in the first direction and the axial force in the second direction are partially offset being uncertain, and thrust bearings in two directions need to be provided. In this embodiment, the structure of the first rotor 11 and the second rotor 19 and / or the third rotor 22 and the fourth rotor 20 can be changed so that within the tolerance range of the first rotor 11 and the third rotor 22, the second rotor 19 and the fourth rotor 20, the axial force in one direction is constantly greater than the axial force in the other direction, so that the resultant force of the axial force generated after the meshing rotation of the first rotor and the third rotor and the second rotor and the fourth rotor is in a fixed direction, so only one direction thrust bearing can be provided, and one direction thrust bearing can be omitted. For example, by changing the structure of the first rotor and the third rotor, 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 can 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 corresponding to the axial force in the second direction.

[0092] In an optional embodiment of the present invention, the fourth rotor 20 is tightly matched with the second shaft 21 .

[0093] In an optional embodiment of the present invention, the third rotor 22 and the fourth rotor 20 are connected to the second shaft 21 via the same key (not shown), and the key serves 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.

[0094] Please refer again Figure 1 In an optional embodiment of the present invention, the rotor assembly 100 further includes a set of third bearings 23, first bearing shells 24, fourth bearings 26 and second bearing shells 27 arranged on the second shaft body 21, the third bearings 23 are located on the non-motor side of the corresponding compressor, the fourth bearings 26 are located on the motor side of the corresponding compressor, and the third rotor 22 is located between the third bearings 23 and the fourth bearings 26. The first bearing shell 24 has a first bearing cavity 25 for accommodating the third bearing 23. The second bearing shell 27 has a second bearing cavity 28 for accommodating the fourth bearing 26.

[0095] Please refer again Figure 1In an optional embodiment of the present invention, the rotor assembly 100 further includes an oil separator 30 located on a side of the third bearing 23 away from the third rotor 22. The oil separator 30 includes an oil separator chamber 31. The oil separator chamber 31 is respectively connected to the first channel 131 and the first bearing chamber 25. After the lubricant is separated by the oil separator 30, a portion 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 chamber 25 to lubricate the third bearing 23.

[0096] In this embodiment, the oil separation 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 in communication with the first oil outlet 312 and the second oil outlet 313. The first oil outlet 312 is in communication with the first channel 131, and the second oil outlet 313 is in communication with the first bearing chamber 25. The lubricant enters the oil separation 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.

[0097] Of course, in other embodiments, the first oil inlet 311 may not be configured as a part of the oil separation chamber 31 , but may be configured separately from the first oil outlet 312 and the second oil outlet 313 .

[0098] In this embodiment, the oil separator 30 is further provided with a throttle plug or the oil separator 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 .

[0099] Please refer again Figure 1 In an optional embodiment of the present invention, the rotor assembly 100 further includes an oil guide member 40 located on a side of the fourth bearing 26 away from the fourth rotor 20, and the oil guide member 40 includes an oil guide chamber 41. The oil guide chamber 41 is respectively connected to the first channel 131 and the second bearing chamber 28. Specifically, the oil separator 30 and the oil guide member 40 are respectively located at both ends of the first shaft body 12 along the axial direction thereof. Part of the lubricant flows from the first channel 131 into the oil guide chamber 41, and then flows from the oil guide chamber 41 into the second bearing chamber 28 to lubricate the fourth bearing 26.

[0100] In this embodiment, the oil guide member 40 is further provided with a throttle plug or the oil guide member 40 itself is a throttle plug with a diversion function to control the amount of lubricant entering the second bearing cavity 28 .

[0101] In this embodiment, the oil guide cavity 41 further includes a second oil inlet 411 and a third oil outlet 412 connected to the second oil inlet 411 , the second oil inlet 411 is connected to the first channel 131 , and the third oil outlet 412 is connected to the second bearing cavity 28 .

[0102] See also Figure 1 and Figure 7 In an optional embodiment of the present invention, the rotor assembly 100 further includes a rotor shell 29 , and the first rotor 11 , the second rotor 19 , the third rotor 22 and the fourth rotor 20 are accommodated in the rotor shell 29 .

[0103] In an optional embodiment of the present invention, the rotor shell 29 includes a first oil return port 291 and a second oil return port 292. The first oil return port 291 is formed on the end surface of the rotor shell 29 facing the third bearing 23 and is connected to the second tooth groove 222. The second oil return port 292 is formed on the end surface of the rotor shell 29 facing the fourth bearing 26 and is connected to the tooth groove of the fourth rotor 20.

[0104] In another optional embodiment of the present invention, the first oil return port 291 and the second oil return port 292 may also be connected to the second tooth groove 222 of the third rotor 22 or the tooth groove of the fourth rotor 20 .

[0105] In another optional embodiment of the present invention, the rotor housing 29 may also include only one first oil return port 291 or one second oil return port 292 .

[0106] In an optional 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 chamber is connected to the first bearing chamber 25, and the other end is connected to the first oil return port 291. The lubricant flowing out of the first bearing chamber 25 flows through the first oil return chamber and the first oil return port 291 into the volume between the first rotor 11 and the third rotor 22 that mesh with each other and / or the volume between the second rotor 19 and the fourth rotor 20 that mesh with each other, that is, flows into the second tooth groove 222 or the tooth groove of the fourth rotor 20 to lubricate the first rotor 11 and the third rotor 22 and / or the second rotor 19 and the fourth rotor 20 that mesh with each other.

[0107] In an optional embodiment of the present invention, the rotor assembly 100 further includes a second oil return member 70 connecting the fourth bearing 26 and the second oil return port 292, and the second oil return member 70 includes a second oil return chamber (not shown). One end of the second oil return chamber is connected to the second bearing chamber 28, and the other end is connected to the second oil return port 292. The lubricant flowing out of the second bearing chamber 28 flows into the tooth groove of the fourth rotor 20 or into the second tooth groove 222 through the first oil return chamber and the first oil return port 291.

[0108] In one 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 connected to the second bearing chamber 28 through the oil guide chamber 41. In this case, the oil guide member 40 has a flow diversion function.

[0109] In an optional embodiment of the present invention, the lubricant is refrigeration oil, which can not only lubricate the rotor assembly 100 but also dissipate heat and provide cooling.

[0110] For ease of understanding, the rotor assembly 100 may have an oil circuit, such as Figure 1 As shown, Figure 1 The arrows shown indicate the flow direction of the lubricant. The lubricant can supply oil to the bearings of the first rotor 11 and the bearings on the left and right sides of the third rotor 22 through the first oil inlet 311. After the bearings are lubricated, the lubricant finally enters the inter-rotor volume to lubricate the meshing parts of the first rotor 11 and the third rotor 22. The flow path of the lubricant may include three oil paths:

[0111] The first oil path includes: a main oil path consisting of a first oil inlet 311 , a first channel 131 in the first shaft body 12 , a branch oil path consisting of a second channel 132 in the first shaft body 12 , a second gap 152 between the first bearing 14 and the first rotor 11 , a third gap 153 and an oil storage chamber 114 .

[0112] The second oil path includes: the first oil inlet 311, the oil separation chamber 31 in the first oil separation member 30, the first bearing chamber 25, the first oil return chamber in the first oil return member 60, the first oil return port 291 and the rotor inter-tooth volume.

[0113] The third oil path includes: the first channel 131, the oil guide cavity 41 in the oil guide member 40, the second bearing cavity 28, the second oil return cavity in the second oil return member 70, the second oil return port 292 and the rotor inter-tooth volume. The first rotor, the second rotor and all bearings can be lubricated through a first oil inlet 311.

[0114] The first oil path, the second oil path, and the third oil path may exist separately, or any two or all three of them may exist at the same time.

[0115] See also Figure 8 The second embodiment of the present invention provides a rotor assembly, which is similar in 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.

[0116] In an optional embodiment of the present invention, the first rotor 11 is made of a self-lubricating non-metallic material, and the first shaft 12 is made of a cemented carbide material.

[0117] In an optional embodiment of the present invention, the first rotor 11 is made of cemented carbide material, and the first shaft 12 is made of self-lubricating non-metallic material.

[0118] In an optional embodiment of the present invention, the third rotor 22 is made of forged steel or cast iron. When the first rotor 11 is made of 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 meshing motions of metal and non-metallic materials, which is beneficial to increase the smoothness of transmission and reduce vibration and noise during the operation of the compressor.

[0119] In an optional 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 and the second rotor is made of a self-lubricating non-metallic material, the first rotor 11 and the third rotor 22 are meshed with metal and non-metallic materials, which is beneficial to increase the smoothness of the transmission and reduce the vibration and noise during the operation of the compressor.

[0120] In an optional embodiment of the present invention, the first rotor 11 may also be made of hard alloy steel, and the third rotor 22 may be made of forged steel or cast iron.

[0121] The embodiment of the present invention further provides a compressor, which may be a screw compressor, such as an opposed screw compressor. It should be noted that the compressor involved in the present invention is not limited to a screw compressor, such as a scroll compressor.

[0122] The compressor includes a rotor assembly defined in combination with one or more of the above embodiments.

[0123] The compressor further includes a motor, which drives the second shaft 21 , the second shaft 21 drives the third rotor 22 , and the third rotor 22 drives the first rotor 11 .

[0124] An embodiment of the present invention further provides an air conditioner, comprising a compressor defined in combination with one or more of the above embodiments.

[0125] The rotor assembly, compressor and air conditioner provided by the present invention, 1) at least one second channel connected to the second gap and the first gap is formed on the first shaft body, and the opening of the second channel on the outer wall of the first shaft body is set in the second area on the outer wall of the first shaft body where the radial force is relatively small, the lubricant can smoothly flow into the second gap and the first gap through the first channel and the second channel and establish an oil film in the first area on the outer wall of the first shaft body where the radial force is relatively large, the oil film can withstand the radial force generated during the rotation of the first rotor, thereby reducing the radial load of the first rotor during operation, thereby lubricating the first rotor and the first shaft body, reducing friction, and improving the operation of the compressor. service life; 2) an oil separator or an oil guide member is arranged between the first channel of the first shaft body and the first bearing cavity or the second bearing cavity, and the lubricant can enter the corresponding bearing cavity through the oil separator or the oil guide member, so as to lubricate the third and fourth bearings, and the oil guide member and the oil separator can also control the amount of lubricant entering the first bearing cavity and the second bearing cavity; 3) a first or second oil return port connected to the tooth groove of the third rotor or the fourth rotor is opened on the side of the rotor shell accommodating the first rotor and the second rotor facing the third or fourth bearing, and a first or second oil return member is arranged to guide the lubricant to the volume between the mutually meshing rotors, which can not only lubricate the mutually meshing rotors, but also reduce the risk of tooth top leakage of the third rotor and the fourth rotor. 4) The oil circuit structure of the rotor assembly provided by the present invention is composed of an oil inlet channel, an oil guide member, an oil distributor, a first bearing cavity, a second bearing cavity, a first oil return member, a second oil return member, a first oil return port, a second oil return port, and mutually meshing rotor volumes. It has a compact structure and can simultaneously complete the lubrication and oil supply to the bearings on both sides of the third rotor and the fourth rotor, the lubrication and oil supply between the first shaft body and the first bearing or the first rotor and the first shaft body, and the lubrication and oil supply to the mutually meshing rotors.

[0126] The above is a detailed introduction to a rotor assembly, a compressor and an air conditioner provided in an embodiment of the present invention. Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation methods and application scopes. In summary, the content of this specification should not be understood as a limitation on the present invention.

Claims

1. A rotor assembly, characterized in that: The rotor assembly comprises: A first shaft body, comprising an outer wall, wherein the outer wall comprises a first surface and a second surface radially adjacent to the first surface; a radial distance from the first surface to the axis of the first shaft body is equal to an outer diameter of the first shaft body, and a radial distance from the second surface to the axis of the first shaft body is less than the outer diameter of the first shaft body; at least one first rotor, sleeved on the first shaft; a first gap is formed between the first rotor and the outer wall of the first shaft; and At least one first bearing is sleeved on the first shaft and carries the first rotor, the first bearing and the first rotor can rotate relative to the first shaft; an oil inlet channel is provided inside the first shaft, the oil inlet channel includes a first channel arranged along the axial direction of the first shaft and at least one second channel arranged along the radial direction of the first shaft, the first channel is connected to the first gap through the second channel, and the second channel is connected to the second gap between the first bearing and the first shaft; there is a gap between two adjacent first bearings, and the gap is connected to the second channel; there is a third gap between the first rotor and the first bearing, and the third gap is connected to the gap, the first bearing is provided with a connecting hole and a through groove connected to the connecting hole, the connecting hole connects the inner surface and the outer surface of the first bearing, so that the lubricant can lubricate the inner surface and the outer surface of the first bearing, and the through groove is connected to the gap between two adjacent first bearings; a plurality of oil storage tanks are also provided on the first rotor, at least one of the oil storage tanks is connected to at least one of the gaps.

2. The rotor assembly according to claim 1, characterized in that 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.

3. The rotor assembly according to claim 1, characterized in that The opening of the oil inlet passage on the outer wall is arranged in the second surface, and the lubricant in the oil inlet passage enters into the first gap through the opening.

4. The rotor assembly according to claim 3, characterized in that: The first shaft body further includes a third surface connecting the first surface and the second surface. The second surface and the third surface form a groove, and the groove is connected to the opening of the oil inlet channel.

5. The rotor assembly according to claim 3, characterized in that: The opening of the second channel on the outer wall is connected to the first gap, and the size of the second channel gradually increases along the oil outlet direction.

6. The rotor assembly according to claim 5, characterized in that The first rotor also includes: a suction end surface; and At least one oil storage cavity is formed by being recessed from the suction end surface toward 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 from the oil storage cavity.

7. The rotor assembly according to claim 6, characterized in that At least one third channel is also provided on the first rotor, and the oil storage chamber is connected with the tooth groove of the first rotor through the third channel. The lubricant retained in the oil storage chamber flows into the tooth groove of the first rotor through the third channel to lubricate the first rotor and the rotor meshing with the first rotor.

8. The rotor assembly according to claim 6, characterized in that The rotor assembly further comprises: The oil storage chamber is communicated with the third gap, and the lubricant in the second gap flows from the third gap into the oil storage chamber and flows out of the oil storage chamber.

9. The rotor assembly according to claim 8, characterized in that The first rotor is also provided with an oil storage groove, the oil storage groove is connected to the gap, and the lubricant in the oil storage groove flows into the second gap through the gap.

10. The rotor assembly according to any one of claims 1 to 9, characterized in that: The rotor assembly further comprises: a second shaft; and A third rotor is sleeved on the second shaft, and the third rotor is meshed with the first rotor.

11. The rotor assembly according to claim 10, wherein: The rotor assembly further comprises: a second rotor, coaxially arranged with the first rotor, the first rotor and the second rotor having opposite thread directions, and the second rotor being sleeved on the first shaft through at least one second bearing; and A fourth rotor is coaxially arranged with the third rotor, and the thread rotation directions of the third rotor and the fourth rotor are opposite.

12. A rotor assembly, characterized in that: The rotor assembly comprises: A first shaft body, comprising an outer wall, wherein the outer wall comprises a first region and a second region radially adjacent to the first region, wherein a radial force in the first region is greater than a radial force in the second region; at least one first rotor, sleeved on the first shaft, an oil inlet passage is provided inside the first shaft, and an opening of the oil inlet passage on the outer wall is connected to a first gap between the first rotor and the first shaft; and At least one first bearing is sleeved on the first shaft and carries the first rotor, the first bearing and the first rotor can rotate relative to the first shaft; the oil inlet channel includes a first channel arranged along the axial direction of the first shaft and at least one second channel arranged along the radial direction of the first shaft, the first channel is connected to the first gap through the second channel, and the second channel is connected to the second gap between the first bearing and the first shaft; there is a gap between two adjacent first bearings, and the gap is connected to the second channel; there is a third gap between the first rotor and the first bearing, and the third gap is connected to the gap, the first bearing is provided with a connecting hole and a through groove connected to the connecting hole, the connecting hole connects the inner surface and the outer surface of the first bearing, so that the lubricant can lubricate the inner surface and the outer surface of the first bearing, and the through groove is connected to the gap between two adjacent first bearings; a plurality of oil storage tanks are also provided on the first rotor, at least one of the oil storage tanks is connected to at least one of the gaps.

13. The rotor assembly according to claim 12, wherein: 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.

14. The rotor assembly according to claim 12, wherein: The opening of the oil inlet passage on the outer wall is arranged in the second region, and the lubricant in the oil inlet passage enters the first gap through the opening.

15. The rotor assembly according to claim 14, wherein: The opening of the second channel on the outer wall is connected to the first gap. At least one groove is formed by recessing from the outer wall of the first shaft body toward the inside of the first shaft body. The groove is disposed in the second area and connected to the second channel.

16. The rotor assembly according to claim 15, wherein: The first rotor further comprises: a suction end surface; and At least one oil storage cavity is formed by being recessed from the suction end surface toward 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 from the oil storage cavity.

17. The rotor assembly of claim 16, wherein: The rotor assembly further comprises: The first rotor further comprises: A suction end surface; At least one oil storage cavity is formed by being recessed from the suction end toward the interior of the first rotor; the oil storage cavity is communicated with the third gap, and the lubricant in the second gap flows from the third gap into the oil storage cavity and flows out of the oil storage cavity.

18. A compressor, characterized in that: The compressor comprises a rotor assembly according to any one of claims 1 to 17.

19. An air conditioner, characterized in that: The air conditioner includes the compressor as claimed in claim 18.

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