Rotor assembly, compressor and air conditioner

Abstract

The application discloses a rotor assembly, a compressor and an air conditioner, relates to the technical field of compressors, and aims to solve the problem of large noise of a rotor assembly during rotation. The rotor assembly provided by the application comprises a first rotor, a first shaft body, a second rotor and a second shaft body. The first rotor comprises first and second tooth portions with opposite rotation directions. The first shaft body carries the first rotor. The second rotor comprises third and fourth tooth portions. The third tooth portion is engaged with the first tooth portion, and the fourth tooth portion is engaged with the second tooth portion. The second shaft body carries the second rotor. One of the first and second tooth portions is made of a metal material, and the other is made of a non-metal material. One of the third and fourth tooth portions is made of the metal material, and the other is made of the non-metal material. The application can reduce the noise of the rotor assembly during rotation.

Description

Technical Field

[0001] This application relates to the field of compressor technology, and more particularly to a rotor assembly, compressor and air conditioner. Background Technology

[0002] A compressor is a driven fluid machine that raises low-pressure gas to high-pressure gas. It is the heart of a refrigeration system. It draws in low-temperature, low-pressure refrigerant gas through the suction pipe, compresses the gas, and then discharges high-temperature, high-pressure refrigerant gas through the discharge pipe, providing power for the refrigeration cycle. Compressors are classified into reciprocating compressors, screw compressors, centrifugal compressors, linear compressors, etc.

[0003] A screw compressor typically contains a pair of parallel screw rotors (i.e., rotor assemblies), which are housed within the compressor's casing. As the screw rotors rotate, this space periodically increases and decreases, causing it to periodically connect and close with the intake and exhaust ports, thus completing the intake, compression, and exhaust processes.

[0004] However, since the rotors in the existing rotor assemblies are all made of metal, the rotor assemblies generate a lot of noise during rotation. Summary of the Invention

[0005] The rotor assembly, compressor, and air conditioner provided in this application are used to solve the problem of excessive noise during the rotation of the rotor assembly.

[0006] To achieve the above objectives, in a first aspect, the rotor assembly provided in this application includes: a first rotor, including a first tooth and a second tooth with opposite rotation directions; a first shaft for carrying the first rotor; a second rotor, including a third tooth and a fourth tooth, wherein the third tooth meshes with the first tooth and the fourth tooth meshes with the second tooth; and a second shaft for carrying the second rotor; wherein one of the first tooth and the second tooth is made of a metallic material and the other is made of a non-metallic material, and / or one of the third tooth and the fourth tooth is made of the metallic material and the other is made of the non-metallic material.

[0007] In some embodiments of this application, the first tooth and the fourth tooth are made of one of the metal material or the non-metal material, and the second tooth and the third tooth are made of another of the metal material or the non-metal material.

[0008] In some embodiments of this application, three of the first, second, third, and fourth teeth are made of the metal material, and the remaining one of the first, second, third, and fourth teeth is made of the non-metal material.

[0009] In some embodiments of this application, three of the first, second, third, and fourth teeth are made of the non-metallic material, and the remaining one of the first, second, third, and fourth teeth is made of the metallic material.

[0010] In some embodiments of this application, three of the first, second, third, and fourth teeth are made of the non-metallic material, while the remaining teeth are made of the metallic material.

[0011] In some embodiments of this application, the first tooth and the first shaft are manufactured using an integral molding process.

[0012] In some embodiments of this application, both the first tooth and the first shaft are made of the metal material.

[0013] In some embodiments of this application, the first tooth and the second tooth are made of different metal materials, or the third tooth and the fourth tooth are made of different metal materials.

[0014] In some embodiments of this application, the metal material is ductile iron, cast steel, carbon steel forgings, or chromium steel.

[0015] In some embodiments of this application, the third tooth and the fourth tooth are made of different non-metallic materials.

[0016] In some embodiments of this application, the non-metallic material is carbon fiber, graphite, PTFE, or PEEK.

[0017] In some embodiments of this application, the first tooth and the first shaft are manufactured using an integral molding process.

[0018] In some embodiments of this application, both the first tooth and the first shaft are made of the metal material or the non-metal material.

[0019] Compared to existing technologies, this application achieves partial meshing of the first and second rotors by having one of the first and second teeth made of a metallic material and the other of a non-metallic material, and / or one of the third and fourth teeth made of the metallic material and the other of the non-metallic material. This allows for the meshing of the first and second rotors to be either metallic teeth or non-metallic teeth, thereby avoiding the situation where all teeth of the first and second rotors are made of metallic materials. In other words, it avoids the meshing of the first and second rotors to be either metallic teeth or non-metallic teeth, thus reducing the noise of the first and second rotors during rotation.

[0020] Secondly, this application also provides a compressor that includes the aforementioned rotor assembly.

[0021] Since the rotor assembly in the compressor provided in this application and the aforementioned rotor assembly adopt the same structure, they can solve the same technical problems and achieve the same expected results.

[0022] Thirdly, this application also provides an air conditioner, which includes the aforementioned compressor.

[0023] Since the rotor assembly in the compressor of the air conditioner provided in this application and the aforementioned rotor assembly adopt the same structure, they can solve the same technical problems and achieve the same expected results. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the rotor assembly provided in an embodiment of this application;

[0025] Figure 2 This is another structural schematic diagram of the rotor assembly provided in an embodiment of this application.

[0026] The main reference numerals in the drawings of this application are explained as follows:

[0027] 1-First rotor; 11-First tooth; 111-First helical blade; 12-Second tooth; 121-Second helical blade; 10-First shaft; 101-First end; 102-Second end; 2-Second rotor; 21-Third tooth; 211-Third helical blade; 22-Fourth tooth; 221-Fourth helical blade; 20-Second shaft; 201-Third end; 202-Fourth end. Detailed Implementation

[0028] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0029] In the description of this application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0030] Reference Figure 1 and Figure 2 The rotor assembly provided in this application embodiment includes a first rotor 1 and a second rotor 2. The first rotor 1 includes a first tooth 11 and a second tooth 12 with opposite rotation directions. A first shaft 10 carries the first rotor 1. The second rotor 2 includes a third tooth 21 and a fourth tooth 22, wherein the third tooth 21 meshes with the first tooth 11 and the fourth tooth 22 meshes with the second tooth 12. A second shaft 20 carries the second rotor 2. The first tooth 11 and the second tooth 12 are made of a metallic material and the other is made of a non-metallic material, and / or the third tooth 21 and the fourth tooth 22 are made of the metallic material and the other is made of the non-metallic material.

[0031] Compared to existing technologies, one of the first tooth 11 and the second tooth 12 is made of a metal material and the other is made of a non-metal material, and / or one of the third tooth 21 and the fourth tooth 22 is made of the metal material and the other is made of the non-metal material, so as to achieve partial meshing of the first rotor 1 and the second rotor 2 by the meshing of the teeth made of metal materials and the teeth made of non-metal materials, or the meshing of the teeth made of non-metal materials with the teeth made of non-metal materials. This avoids the situation where all the teeth of the first rotor 1 and the second rotor 2 are made of metal materials, that is, it avoids the meshing of the first rotor 1 and the second rotor 2 by the meshing of the teeth made of metal materials with the teeth made of metal materials, thereby reducing the noise of the first rotor 1 and the second rotor 2 during rotation.

[0032] It is understood that the rotor assembly in this application is a four-rotor structure, namely, the first rotor 1 includes a first tooth 11 and a second tooth 12 arranged coaxially, and the second rotor 2 includes a third tooth 21 and a fourth tooth 22 arranged coaxially. The first shaft 10 is parallel to the second shaft 20, and the axis of the first shaft 10 is parallel to the axis of the second shaft 20.

[0033] In the description of this application, it should be understood that the terms "first," "second," etc., are used to distinguish different objects, not to describe a specific order. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion.

[0034] To better understand the scheme of "one of the first tooth 11 and the second tooth 12 being made of a metallic material and the other of a non-metallic material, and / or one of the third tooth 21 and the fourth tooth 22 being made of the metallic material and the other of the non-metallic material", the above scheme will be explained in detail below in combination with three cases.

[0035] Firstly, one of the teeth 11 and 12 on the first rotor 1 is made of a material either metal or non-metal, and the other tooth 11 and 12 is made of the same material or the same non-metal.

[0036] Secondly, one of the third tooth 21 and the fourth tooth 22 on the second rotor 2 is made of a material of metal or non-metal, and the other tooth is made of the same material or non-metal.

[0037] Thirdly, one of the first tooth 11 and the second tooth 12 on the first rotor 1 is made of a material of metal or non-metal, and the other tooth is made of the same material. Furthermore, one of the third tooth 21 and the fourth tooth 22 on the second rotor 2 is made of a material of metal or non-metal, and the other tooth is made of the same material.

[0038] Based on the above embodiments, the first rotor 1 can be connected to a drive component such as a motor (including but not limited to a permanent magnet motor) and driven to rotate by the drive component. That is, the first rotor 1 is a male rotor, and as a male rotor, the first rotor 1 can be understood as an active rotor. The first rotor 1 is provided with a shaft hole that mates with the first shaft 10, and the first rotor 1 is sleeved on the first shaft 10 through the shaft hole. While the first rotor 1 rotates around the axis of the first shaft 10, it drives the second rotor 2 to rotate together through meshing.

[0039] Therefore, the second rotor 2 is a female rotor, and as a female rotor, the second rotor 2 can be understood as a driven rotor. The second rotor 2 is provided with a shaft hole that mates with the second shaft 20. The second rotor 2 is sleeved on the second shaft 20 through the shaft hole, and the second rotor 2 can rotate around the axis of the second shaft 20.

[0040] In some embodiments of this application, there is a gap between the end faces of the first tooth 11 and the second tooth 12 that are close to each other in the first rotor 1 of this application. It is understood that there is a gap or no contact between the first tooth 11 and the second tooth 12 to ensure that the distance between the first tooth 11 and the fourth tooth 22 is large and that the two do not interfere with each other; the distance between the second tooth 12 and the third tooth 21 is large and that the two do not interfere with each other.

[0041] The following describes in detail, with reference to several embodiments, a scheme in which one of the two teeth on at least one of the first rotor 1 and the second rotor 2 is made of a material of either metal or non-metal, and the other of the two teeth is made of either the metal material or the non-metal material.

[0042] In some embodiments, the first tooth 11 and the fourth tooth 22 are made of one of the metal material or the non-metal material, and the second tooth 12 and the third tooth 21 are made of another of the metal material or the non-metal material. That is, the materials of the two teeth located on the same shaft are different, the materials of the two teeth that mesh with each other are different, and the materials of the two teeth that are diagonally opposite are the same. This ensures that the materials of the teeth that mesh with the first rotor 1 and the second rotor 2 are different, thereby further reducing the noise generated during the rotation of the rotor assembly.

[0043] For example, the first tooth 11 is made of a metallic material, the second tooth 12 is made of a non-metallic material, the third tooth 21 is made of a non-metallic material, and the fourth tooth 22 is made of a metallic material.

[0044] Alternatively, the first tooth 11 may be made of a non-metallic material, the second tooth 12 may be made of a metallic material, the third tooth 21 may be made of a metallic material, and the fourth tooth 22 may be made of a non-metallic material.

[0045] In other embodiments, three of the aforementioned first tooth 11, second tooth 12, third tooth 21, and fourth tooth 22 are made of the metal material, while the remaining tooth is made of the non-metal material. That is, three of the four teeth are made of metal and the remaining tooth is made of non-metal, thereby ensuring that the rotor assembly has good wear resistance during rotation. This is suitable for operating conditions where noise requirements are not very strict but wear resistance of the rotor assembly is high.

[0046] That is, the first tooth 11 is made of metal, the second tooth 12 is made of metal, the third tooth 21 is made of metal, and the fourth tooth 22 is made of non-metallic material.

[0047] Alternatively, the first tooth 11 may be made of a non-metallic material, the second tooth 12 may be made of a metallic material, the third tooth 21 may be made of a metallic material, and the fourth tooth 22 may be made of a metallic material.

[0048] Alternatively, the first tooth 11 may be made of a metallic material, the second tooth 12 may be made of a non-metallic material, the third tooth 21 may be made of a metallic material, and the fourth tooth 22 may be made of a metallic material.

[0049] Alternatively, the first tooth 11 may be made of a metal material, the second tooth 12 may be made of a metal material, the third tooth 21 may be made of a non-metallic material, and the fourth tooth 22 may be made of a metal material.

[0050] Based on the above embodiments, the first tooth 11 and the second tooth 12 are made of different metal materials, or the third tooth 21 and the fourth tooth 22 are made of different metal materials.

[0051] That is, the two teeth on the same shaft are made of different types of metal materials, so that each tooth can be selected with a more suitable metal according to its actual use (i.e. wear and service life) to improve the performance of the rotor assembly.

[0052] In other embodiments, three of the aforementioned first tooth 11, second tooth 12, third tooth 21, and fourth tooth 22 are made of the non-metallic material, while the remaining tooth is made of the metallic material. That is, three of the four teeth are made of non-metallic material, and the remaining tooth is made of metallic material. This allows the meshing teeth to achieve a combination of metal and non-metal, or non-metal and non-metal, resulting in better performance and noise levels. This makes it suitable for operating conditions with high noise requirements and relatively low wear resistance requirements for rotor components.

[0053] That is, the first tooth 11 is made of metal, the second tooth 12 is made of non-metal, the third tooth 21 is made of non-metal, and the fourth tooth 22 is made of non-metal.

[0054] Alternatively, the first tooth 11 may be made of a non-metallic material, the second tooth 12 may be made of a metallic material, the third tooth 21 may be made of a non-metallic material, and the fourth tooth 22 may be made of a non-metallic material.

[0055] Alternatively, the first tooth 11 may be made of a non-metallic material, the second tooth 12 may be made of a non-metallic material, the third tooth 21 may be made of a metallic material, and the fourth tooth 22 may be made of a non-metallic material.

[0056] Alternatively, the first tooth 11 may be made of a non-metallic material, the second tooth 12 may be made of a non-metallic material, the third tooth 21 may be made of a non-metallic material, and the fourth tooth 22 may be made of a metallic material.

[0057] Similarly, the first tooth 11 and the second tooth 12 are made of different non-metallic materials, or the third tooth 21 and the fourth tooth 22 are made of different non-metallic materials.

[0058] That is, the two teeth on the same shaft are made of different types of non-metallic materials, so that each tooth can be selected with a more suitable non-metal based on its actual use (i.e. wear, noise), ensuring that the rotor assembly has high performance while keeping the noise low.

[0059] In other embodiments, the first tooth 11 and the third tooth 21 are made of one of the metal material or the non-metal material, and the second tooth 12 and the fourth tooth 22 are made of another of the metal material or the non-metal material, thereby ensuring that the meshing teeth are made of the same material and that the wear between them is similar, thus ensuring that the operation of the meshing parts is relatively stable and reliable.

[0060] That is, the two teeth on the same shaft are made of different materials, while the two teeth that mesh with each other are made of the same material. It can be understood that the first tooth 11 and the fourth tooth 22 are made of different materials, and the second tooth 12 and the third tooth 21 are made of different materials.

[0061] For example, the first tooth 11 is made of a non-metallic material, the second tooth 12 is made of a metallic material, the third tooth 21 is made of a non-metallic material, and the fourth tooth 22 is made of a metallic material.

[0062] Alternatively, the first tooth 11 may be made of a metallic material, the second tooth 12 may be made of a non-metallic material, the third tooth 21 may be made of a metallic material, and the fourth tooth 22 may be made of a non-metallic material.

[0063] Based on the above embodiments, according to the material strength and stiffness, and combined with the part shape, machinability and cost of the teeth in the rotor assembly, the above metal material is determined to be ductile iron, cast steel, carbon steel forgings or chromium steel.

[0064] In addition, the non-metallic material is carbon fiber, graphite, PTFE or PEEK.

[0065] Firstly, the good self-lubricating properties of carbon fiber, graphite, PTFE, or PEEK enable the rotor assembly to achieve vibration reduction and noise reduction.

[0066] Secondly, because carbon fiber, graphite, PTFE, or PEEK have low coefficients of thermal expansion, the problem of large dimensional changes in the teeth caused by temperature variations can be avoided when the teeth are made of non-metallic materials.

[0067] Third, the strength of carbon fiber, graphite, PTFE, or PEEK is sufficient to ensure the service life of the rotor assembly.

[0068] In some embodiments of this application, the first tooth 11 is a hollow cylindrical member with a first helical blade 111 on its outer surface; the second tooth 12 is a hollow cylindrical member with a second helical blade 121 on its outer surface; the threads of the first helical blade 111 and the second helical blade 121 are opposite, that is, the threads of the first tooth 11 and the second tooth 12 are opposite; wherein, the number of the first helical blades 111 is at least two, and the number of the second helical blades 121 is at least two. The first shaft 10 carries the first tooth 11 and the second tooth 12 of the first rotor 1; the first shaft 10 has a first end 101 and a second end 102, and the first tooth 11 and the second tooth 12 are confined between the first end 101 and the second end 102; the first tooth 11 and the second tooth 12 are rotatable on the first shaft 10 along the axis of the first shaft 10.

[0069] Furthermore, when the first rotor 1 and the second rotor 2 mesh and rotate with each other, the first tooth 11 and the second tooth 12 of the first rotor 1 rotate in opposite directions. As a result, opposite axial forces are generated between the first tooth 11 and the second tooth 12. This can also be understood as opposite axial flows being generated between the first tooth 11 and the second tooth 12. Due to the symmetry of the axial forces, the opposite axial forces generated between the first tooth 11 and the second tooth 12 of the first rotor 1 can almost cancel each other out.

[0070] Similarly, the second rotor 2 includes the third tooth 21 and the fourth tooth 22. The third tooth 21 is a hollow cylindrical component with a third helical blade 211 on its outer surface; the fourth tooth 22 is a hollow cylindrical component with a fourth helical blade 221 on its outer surface; the threads of the third helical blade 211 and the fourth helical blade 221 are opposite, that is, the threads of the third tooth 21 and the fourth tooth 22 are opposite. The third helical blade 211 of the third tooth 21 meshes with the first helical blade 111 of the first tooth 11, and the fourth helical blade 221 of the fourth tooth 22 meshes with the second helical blade 121 of the second tooth 12, so that the second rotor 2 and the first rotor 1 mesh with each other; wherein the number of the third helical blade 211 is at least two; the number of the fourth helical blade 221 is at least two. The second shaft 20 carries the third tooth 21 and the fourth tooth 22 of the second rotor 2; the second shaft 20 has a third end 201 and a fourth end 202, the third tooth 21 and the fourth tooth 22 are constrained between the third end 201 and the fourth end 202, and the third tooth 21 and the fourth tooth 22 rotate around the second shaft 20 along the axis of the second shaft 20 under the drive of the first tooth 11 and the second tooth 12.

[0071] Similarly, the opposite axial forces generated between the third tooth 21 and the fourth tooth 22 can also be understood as the opposite axial flows generated between the third tooth 21 and the fourth tooth 22. Due to the symmetry of the axial forces, the opposite axial forces generated between the third tooth 21 and the fourth tooth 22 of the second rotor 2 can almost cancel each other out.

[0072] In some embodiments of this application, the first tooth 11 and the first shaft 10 are manufactured by an integral molding process to avoid the mechanical accumulation error generated when the first tooth 11 is installed on the first shaft 10, thereby ensuring good coaxiality between the first tooth 11 and the first shaft 10. This avoids the problem of noise and severe local wear generated by the first tooth 11 and the third tooth 21 during rotation due to the installation error of the first tooth 11.

[0073] Based on the above embodiments, the first tooth 11 and the first shaft 10 are both made of the metal material or the non-metal material, that is, the first tooth 11 and the first shaft 10 are made of the same material, so as to ensure that the processing technology of the first tooth 11 and the first shaft 10 is simple and the above method is easier to implement.

[0074] Secondly, embodiments of this application also provide a compressor, which includes the aforementioned rotor assembly.

[0075] Since the rotor assembly in the compressor provided in this application and the aforementioned rotor assembly adopt the same structure, they can solve the same technical problems and achieve the same expected results.

[0076] Thirdly, embodiments of this application also provide an air conditioner, which includes the compressor described above.

[0077] Since the rotor assembly in the compressor of the air conditioner provided in this application and the aforementioned rotor assembly adopt the same structure, they can solve the same technical problem and achieve the same expected effect.

[0078] In the description of this specification, specific features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples.

[0079] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A rotor assembly, characterized in that, include: The first rotor includes a first tooth and a second tooth with opposite directions of rotation; The first shaft supports the first rotor; The second rotor includes a third tooth and a fourth tooth, wherein the third tooth meshes with the first tooth and the fourth tooth meshes with the second tooth; The second shaft supports the second rotor; wherein... One of the first tooth and the second tooth is made of a metallic material and the other is made of a non-metallic material, and / or one of the third tooth and the fourth tooth is made of the metallic material and the other is made of the non-metallic material; Two teeth on the same shaft are made of different materials, while two meshing teeth are made of the same material. There is a gap between the end faces of the first tooth and the second tooth that are close to each other.

2. The rotor assembly according to claim 1, characterized in that, The first tooth and the first shaft are manufactured using an integral molding process.

3. The rotor assembly according to claim 1, characterized in that, Both the first tooth and the first shaft are made of the metal material or the non-metal material.

4. The rotor assembly according to any one of claims 1 to 3, characterized in that, The metal material is ductile iron, cast steel, carbon steel forgings, or chromium steel. The non-metallic material is carbon fiber, graphite, PTFE, or PEEK.

5. A compressor, characterized in that, The rotor assembly includes any one of claims 1 to 4.

6. An air conditioner, characterized in that, Includes the compressor described in claim 5.

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