Motor assembly and compressor

Abstract

The utility model provides a motor assembly and a compressor. The motor assembly comprises a rotating shaft which is provided with a rotor; two bearing supports; and positioning the sleeve. According to the motor assembly and the compressor provided by the utility model, the positioning sleeve is arranged, the bearing supports of the two gas bearings are axially positioned, the positioning sleeve can be precisely machined, the positioning precision of the two bearing supports is improved by utilizing the machining precision of the positioning sleeve, and the high-precision installation of the gas bearings is realized; the problem that in the prior art, a motor shell is complex in structure and cannot meet the installation precision of a gas bearing is solved, the installation precision of a gas bearing support can be greatly improved, the working reliability of the gas bearing under a small gas film gap is guaranteed, the operation reliability of a gas suspension compressor is improved, and therefore the assembly precision of a motor assembly and the compressor is guaranteed; and the reliability of the compressor is ensured.

Description

Technical Field

[0001] This utility model relates to the field of compression equipment technology, and in particular to a motor assembly and a compressor. Background Technology

[0002] Air-suspension compressors use gas bearings to support the rotor, achieving oil-free and frictionless operation. The gas bearings use gas as the lubricating medium. Due to the low viscosity of the gas and its micron-level film thickness, the bearings require extremely high installation precision inside the compressor. Tilting during installation significantly reduces the bearing's load-bearing capacity and makes it prone to rubbing against each other.

[0003] Gas bearings require high coaxiality between the primary and secondary radial gas bearings, as well as high perpendicularity between the thrust bearing and the primary and secondary bearing supports. Currently, gas bearing supports are typically mounted directly on the cylinder. However, the cylinder structure is complex, meaning the mounting surfaces for the bearing supports can only be machined using milling or boring. The machining accuracy of these mounting surfaces is often low, making it difficult to guarantee the installation accuracy of the gas bearing. This can reduce the bearing's load-bearing capacity and, in severe cases, lead to bearing wear, affecting the compressor's reliability. Utility Model Content

[0004] To address the technical problem of low positioning accuracy of gas bearings affecting compressor reliability in existing technologies, a motor assembly and compressor are provided that utilize a positioning sleeve to axially position the bearing support of the gas bearing to improve reliability.

[0005] A motor assembly, comprising:

[0006] A rotating shaft, on which a rotor is mounted;

[0007] The rotor has two bearing supports, and the rotating shaft is connected to the two bearing supports respectively via gas bearings, with the two bearing supports located on both sides of the rotor.

[0008] A positioning sleeve is sleeved on the rotating shaft, with one end of the positioning sleeve abutting against one of the bearing supports and the other end abutting against another of the bearing supports.

[0009] The motor assembly also includes a stator disposed within the positioning sleeve, and the rotor is rotatably disposed inside the stator.

[0010] The outer wall surface of the stator abuts against the inner wall surface of the positioning sleeve.

[0011] The gas bearing includes a radial gas bearing, which is sleeved on the rotating shaft and disposed on a corresponding bearing support.

[0012] The bearing support has a positioning surface facing the rotor, and the positioning surface abuts against the end face of the positioning sleeve.

[0013] A radial positioning structure is provided on the positioning surface, and the radial positioning structure abuts against the inner surface of the positioning sleeve.

[0014] The positioning surface and / or the end face of the positioning sleeve are formed by grinding.

[0015] A compressor comprising the aforementioned motor assembly.

[0016] The compressor also includes an impeller disposed on the rotating shaft, and the impeller is located on the side of the bearing support away from the rotor.

[0017] The number of impellers is two, both of which are mounted on the rotating shaft, and both bearing supports are located between the two impellers.

[0018] The motor assembly and compressor provided by this utility model, by setting a positioning sleeve, axially positions the bearing supports of two gas bearings. The positioning sleeve can be precision machined, and the machining accuracy of the positioning sleeve is used to improve the positioning accuracy of the two bearing supports, realizing high-precision installation of gas bearings. This avoids the problem in the prior art where the complex structure of the motor housing cannot meet the installation accuracy of gas bearings. It can significantly improve the installation accuracy of gas bearing supports, ensure the working reliability of gas bearings under small film gaps, improve the operational reliability of air suspension compressors, thereby ensuring the assembly accuracy of motor assembly and compressor, and thus ensuring the reliability of compressor. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of the motor assembly provided in an embodiment of the present utility model;

[0020] Figure 2 A schematic diagram of the compressor provided in an embodiment of this utility model;

[0021] In the picture:

[0022] 1. Shaft; 2. Rotor; 3. Bearing support; 4. Gas bearing; 5. Positioning sleeve; 6. Stator; 7. Radial positioning structure; 8. Impeller. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only for explaining this utility model and are not intended to limit this utility model.

[0024] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.

[0025] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this utility model are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such terms can be used interchangeably where appropriate for the embodiments of the utility model described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0026] It should be noted that in the description of this utility model, the terms "upper," "lower," "left," "right," "inner," and "outer," which indicate directional or positional relationships, are based on the directional or positional relationships shown in the accompanying drawings. These are merely for ease of description and do not indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0027] Furthermore, it should be noted that, in the description of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "setting," and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection, an indirect connection through an intermediate medium, or a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0028] Gas bearings require high coaxiality between the primary and secondary radial gas bearings, as well as high perpendicularity between the thrust bearing and the primary and secondary bearing supports. Currently, gas bearing supports are typically mounted directly on the cylinder. However, the cylinder structure is complex, meaning the mounting surfaces for the bearing supports can only be machined using milling or boring. The machining accuracy of these mounting surfaces is often low, making it difficult to guarantee the installation accuracy of the gas bearing. This can reduce the bearing's load-bearing capacity and, in severe cases, lead to bearing wear, affecting the compressor's reliability.

[0029] Therefore, this application provides a method such as Figure 1 and Figure 2 The motor assembly shown includes: a rotating shaft 1 on which a rotor 2 is mounted; two bearing supports 3, the rotating shaft 1 being connected to the two bearing supports 3 via gas bearings 4, with the two bearing supports 3 located on opposite sides of the rotor 2; and a positioning sleeve 5 fitted onto the rotating shaft 1, one end of the positioning sleeve 5 engaging with one of the bearing supports 3 and the other end engaging with the other bearing support 3. By using the positioning sleeve 5, the bearing supports 3 of the two gas bearings 4 are axially positioned. The positioning sleeve 5 can be precision machined, and its machining accuracy improves the positioning accuracy of the two bearing supports 3, achieving high-precision installation of the gas bearings 4. This avoids the problem in existing technologies where the complex structure of the motor housing cannot meet the installation accuracy requirements of the gas bearings 4. It significantly improves the installation accuracy of the gas bearing 4 supports 3, ensuring the operational reliability of the gas bearings 4 under small film gaps, improving the operational reliability of the air-suspension compressor, thereby ensuring the assembly accuracy of the motor assembly and the compressor, and ultimately ensuring the reliability of the compressor.

[0030] Two bearing supports 3 are fixed to the left and right sides of the positioning sleeve 5. The positioning sleeve 5 is designed as a simple ring structure, which facilitates high-precision grinding of its inner diameter, outer diameter, and end faces using a high-precision grinding machine. This ensures that key tolerances such as the perpendicularity of the end face to the inner diameter, the flatness of the end face, and the coaxiality of the inner diameters on both sides of the positioning sleeve 5 are controlled to the micrometer level. The two bearing supports 3 are directly fixed to both ends of the positioning sleeve 5, guaranteeing high-precision installation of the bearing supports 3.

[0031] The motor assembly also includes a stator 6, which is disposed within the positioning sleeve 5, and the rotor 2 is rotatably disposed within the stator 6. The motor stator 6 is synchronously fixed inside the positioning sleeve 5, so that the positioning sleeve 5, together with the two bearing supports 3 and the motor stator 6, forms an assembly installed in the motor housing, making the motor assembly a whole, which facilitates the installation and use of the motor assembly.

[0032] Furthermore, the outer wall surface of the stator 6 abuts against the inner wall surface of the positioning sleeve 5. Because the positioning sleeve 5 has a relatively regular and simple shape, it is easy to perform high-precision grinding. Compared with the structure of the complex motor cylinder and the bearing support 3 directly fixed in the motor cylinder, the precision of the parts is easier to guarantee, the coaxiality of the two gas bearing 4 supports 3 is better, and the reliability of the compressor is higher.

[0033] The gas bearing 4 includes a radial gas bearing, which is sleeved on the rotating shaft 1. The radial gas bearing generates a gas film on the surface of the rotating shaft 1 to reliably support the rotating shaft 1. At the same time, since the reliability of the gas film needs to be guaranteed, the coaxiality and positioning accuracy of the radial gas bearing need to be guaranteed. The radial gas bearing is set on the corresponding bearing support 3. Therefore, the positioning accuracy of the radial gas bearing can be guaranteed by the positioning accuracy of the bearing support 3.

[0034] Specifically, the bearing support 3 has a positioning surface facing the rotor 2, which abuts against the end face of the positioning sleeve 5. Both the positioning surface of the bearing support 3 and the end face of the positioning sleeve 5 are planes exposed outside the structure. Such planes are easy to process and can ensure processing accuracy, thereby ensuring the positioning accuracy of the radial gas bearing and the high-precision installation of the bearing support 3, thus improving the reliability of the compressor.

[0035] A radial positioning structure 7 is provided on the positioning surface, and the radial positioning structure 7 abuts against the inner surface of the positioning sleeve 5. The radial positioning structure 7 and the inner surface of the positioning sleeve 5 are used to further increase the radial positioning accuracy of the bearing support 3 and the positioning sleeve 5, and further improve the positioning accuracy of the gas bearing 4, ensuring the reliability of the compressor while ensuring a small gas film clearance.

[0036] Similarly, the gas bearing 4 also includes a thrust bearing. The side of the thrust bearing abuts against the positioning surface of the bearing support 3. Since the positioning sleeve 5 can ensure the positioning accuracy of the bearing support 3, the perpendicularity of the positioning surface of the bearing support 3 can also be guaranteed, thereby ensuring the positioning accuracy of the thrust bearing and further improving the reliability of the compressor.

[0037] The positioning surface and / or the end face of the positioning sleeve 5 are formed by grinding. Grinding ensures that the tolerances of the positioning surface and the end face of the positioning sleeve 5 are controlled at the micron level, achieving high-precision installation and ensuring the reliability of the compressor while maintaining a small air film gap.

[0038] A compressor comprising the aforementioned motor assembly.

[0039] The compressor also includes an impeller 8, which is mounted on the rotating shaft 1 and located on the side of the bearing support 3 away from the rotor 2. The rotation of the impeller 8 compresses the fluid, and by positioning the impeller 8 and rotor 2 on opposite sides of the bearing support 3, the installation accuracy of the impeller 8 can be simultaneously improved using the gas bearing 4, further enhancing the reliability of the compressor.

[0040] There are two impellers 8, both of which are mounted on the rotating shaft 1, and two bearing supports 3 are located between the two impellers 8. The two bearing supports 3 provide reliable and high-precision mounting support for the two impellers 8, further improving the reliability of the compressor.

[0041] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A motor assembly, characterized in that: include: A rotating shaft (1) on which a rotor (2) is mounted; Two bearing supports (3) are provided. The rotating shaft (1) is connected to the two bearing supports (3) respectively via gas bearings (4), and the two bearing supports (3) are located on both sides of the rotor (2). Positioning sleeve (5) is sleeved on the rotating shaft (1), and one end of the positioning sleeve (5) abuts against one of the bearing supports (3), and the other end abuts against another bearing support (3).

2. The motor assembly according to claim 1, characterized in that: The motor assembly also includes a stator (6), which is disposed inside the positioning sleeve (5), and the rotor (2) is rotatably disposed inside the stator (6).

3. The motor assembly according to claim 2, characterized in that: The outer wall surface of the stator (6) abuts against the inner wall surface of the positioning sleeve (5).

4. The motor assembly according to claim 1, characterized in that: The gas bearing (4) includes a radial gas bearing, which is sleeved on the rotating shaft (1) and disposed on the corresponding bearing support (3).

5. The motor assembly according to claim 1, characterized in that: The bearing support (3) has a positioning surface facing the rotor (2), and the positioning surface abuts against the end face of the positioning sleeve (5).

6. The motor assembly according to claim 5, characterized in that: A radial positioning structure (7) is provided on the positioning surface, and the radial positioning structure (7) abuts against the inner surface of the positioning sleeve (5).

7. The motor assembly according to claim 5, characterized in that: The positioning surface and / or the end face of the positioning sleeve (5) are formed by grinding.

8. A compressor, characterized in that: Includes the motor assembly according to any one of claims 1 to 7.

9. The compressor according to claim 8, characterized in that: The compressor also includes an impeller (8) disposed on the shaft (1) and the impeller (8) is located on the side of the bearing support (3) away from the rotor (2).

10. The compressor according to claim 9, characterized in that: There are two impellers (8), both of which are mounted on the rotating shaft (1), and both bearing supports (3) are located between the two impellers (8).

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