Motor assembly structure for compressor, bearing and compressor
By adding a third bearing to the compressor and connecting it to the housing via a bracket, a new support and limiting structure is formed, which solves the problem of lateral bending of the eccentric shaft caused by the centrifugal force of the motor rotor, and realizes the reliability and stability of the compressor at high speed.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- XIAN QINGAN REFRIGERATION EQUIP CO LTD
- Filing Date
- 2025-05-27
- Publication Date
- 2026-05-12
AI Technical Summary
In the existing technology, the centrifugal force of the motor rotor is large, which leads to large lateral bending of the shaft and easy friction failure. The existing compressor assembly method cannot effectively constrain the motor rotor of large displacement compressor.
A third bearing is added to the compressor. The third bearing is sleeved on the outside of the motor rotor and connected to the housing through a bracket. The bracket is welded to the housing and the bracket is connected to the third bearing by bolts. A connecting shaft hole is set in the middle of the third bearing. A bushing is installed in the connecting shaft hole. The bushing is interference-fitted with the eccentric shaft to form a new support and limiting structure.
It effectively reduces the lateral bending of the eccentric shaft caused by centrifugal force at high speeds, avoids friction failures, ensures the reliability and stability of the compressor, and improves the motor's fixing stability and ease of disassembly.
Smart Images
Figure CN224233480U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of compressor assembly technology, and relates to a motor assembly structure, bearing and compressor for compressors. Background Technology
[0002] For large-displacement rotary compressors, the eccentric shaft that fixes the motor rotor is a cantilever beam structure. When the compressor operates at high speed, the centrifugal force of the motor rotor is large, resulting in significant lateral bending of the shaft, which can easily lead to motor failure due to friction. However, the existing assembly method of the motor inside the compressor provides limited constraints on the motor rotor and cannot meet the requirements of large-displacement compressors. Utility Model Content
[0003] The purpose of this invention is to solve the problem that the centrifugal force of the motor rotor in the prior art is large, which leads to large lateral bending of the shaft and easy failure of the motor due to friction. The invention provides a motor assembly structure, bearing and compressor for compressor, with the aim of reducing the lateral bending of the eccentric shaft caused by the centrifugal force on the motor rotor when the compressor is running at high speed.
[0004] To achieve the above objectives, the present invention adopts the following technical solution:
[0005] An electric motor assembly structure for a compressor includes a housing, a motor disposed within the housing, and a third bearing, a first bearing, and a second bearing arranged sequentially from top to bottom around the motor.
[0006] The first bearing is sleeved in the middle of the eccentric shaft, the second bearing is sleeved in the lower part of the eccentric shaft, and the third bearing is sleeved in the upper part of the eccentric shaft. The third bearing is connected to the housing.
[0007] A further improvement of this utility model is that
[0008] The third bearing is connected to the housing via a bracket.
[0009] The bracket is welded to the housing, and the bracket is connected to the third bearing by bolts.
[0010] The support has several circumferentially distributed components.
[0011] The support has four circumferentially distributed components.
[0012] The area of the cross-section of the bracket is smaller than the area of the cross-section of the cut edge of the motor stator to be assembled.
[0013] A bearing includes a third bearing body, wherein a threaded hole is formed on the third bearing body for connecting to a housing;
[0014] The third bearing body has a connecting shaft hole in the middle, and the axial height of the connecting shaft hole is greater than the axial height of the third bearing body.
[0015] The connecting shaft hole is assembled with the eccentric shaft.
[0016] A bushing is installed inside the connecting shaft hole.
[0017] The bushing is interference-fitted with the connecting shaft hole.
[0018] A compressor, characterized in that it includes the assembly structure described in any one of the utility models.
[0019] Compared with the prior art, the present invention has the following beneficial effects:
[0020] This utility model discloses a motor assembly structure for a compressor. The third bearing is sleeved on the outside of the motor rotor, forming a new support for the eccentric shaft. When the lateral bending of the eccentric shaft exceeds a certain range, it provides a limiting and supporting effect on the eccentric shaft, avoiding friction failure of the motor and thus ensuring the reliability of the compressor during high-speed operation. At the same time, the third bearing is connected to the housing, ensuring the stability of the third bearing and preventing motor failure due to friction.
[0021] Furthermore, in this invention, the third bearing is connected to the housing via a bracket, which serves as the connection carrier to ensure the stability of the connection and the flexibility of adjustment.
[0022] Furthermore, in this utility model, the bracket is welded to the shell to improve the connection stability, and the bracket is connected to the third bearing by bolts to facilitate the disassembly of the third bearing. The adoption of a detachable third bearing body installation method reduces the difficulty of concentric adjustment between the third bearing bush and the eccentric shaft, which is conducive to ensuring the support effect of the third bearing structure on the eccentric shaft.
[0023] Furthermore, in this invention, the bracket is circumferentially distributed in several parts to ensure the stability of the connection.
[0024] This utility model discloses a bearing, wherein a connecting shaft hole is provided in the middle of the third bearing body, and the axial height of the connecting shaft hole is greater than the axial height of the third bearing body; the connecting shaft hole is assembled with the eccentric shaft of the compressor, which can better constrain the lateral bending generated by the eccentric shaft. When the compressor is running at high speed, it reduces the lateral bending of the eccentric shaft caused by the centrifugal force on the motor rotor, and avoids motor failure due to friction.
[0025] Furthermore, in this invention, a bushing is provided inside the connecting shaft hole. As the rotational speed increases, the skewness continues to increase. When the upper part of the eccentric shaft comes into contact with the bushing, the bushing, supported by the third bearing body, limits the further increase in the skewness of the eccentric shaft, thereby limiting the skewness within a certain range and ensuring the safety and reliability of the motor.
[0026] This utility model discloses a compressor in which a third bearing is added during the assembly of the motor inside the compressor. The third bearing is sleeved on the outside of the motor rotor. The purpose is to reduce the lateral bending of the eccentric shaft caused by the centrifugal force on the motor rotor when the compressor is running at high speed. At the same time, the third bearing is connected to the housing to ensure the stability of the third bearing and avoid motor failure due to friction. Attached Figure Description
[0027] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.
[0028] Figure 1 This is a structural diagram of the compressor according to an embodiment of the present utility model;
[0029] Figure 2 This is a structural diagram of the third bearing according to an embodiment of the present utility model;
[0030] Figure 3 This is a diagram showing the relative positions of the bracket and the motor stator in an embodiment of the present invention.
[0031] Figure 4 This is a structural diagram of the support structure in Embodiment 3 of this utility model;
[0032] Figure 5 This is a structural diagram of the support structure in Embodiment 4 of this utility model.
[0033] Wherein: 1-Third bearing; 2-Motor; 3-First bearing; 4-Second bearing; 5-Third bearing body; 6-Bracket; 7-Bushing; 8-Bolt; 9-Housing; 10-Motor stator cut edge; 11-Motor stator. Detailed Implementation
[0034] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.
[0035] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.
[0036] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.
[0037] In the description of the embodiments of this utility model, it should be noted that if terms such as "upper," "lower," "horizontal," or "inner" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use, they are only for the convenience of describing the utility model 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, and therefore should not be construed as a limitation on the utility model. Furthermore, terms such as "first" and "second" are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.
[0038] Furthermore, the use of the term "horizontal" does not imply that the component must be absolutely horizontal, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.
[0039] In the description of the embodiments of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" 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 mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of 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.
[0040] The present invention will now be described in further detail with reference to the accompanying drawings:
[0041] See Figures 1 to 5 This utility model discloses a motor assembly structure, bearing, and compressor for a compressor. The purpose is to provide a third bearing structure and compressor that support the upper eccentric shaft of the motor during high-speed operation. Specifically, it includes:
[0042] Example 1
[0043] See Figure 1 This utility model discloses a motor assembly structure for a compressor, including a housing 9, a motor 2 is disposed inside the housing 9, and a third bearing 1, a first bearing 3 and a second bearing 4 are arranged sequentially from top to bottom around the motor 2; the first bearing 3 is sleeved on the middle part of the eccentric shaft, the second bearing 4 is sleeved on the lower part of the eccentric shaft, and the third bearing 1 is sleeved on the upper part of the eccentric shaft, and the third bearing 1 is connected to the housing 9.
[0044] In this embodiment of the utility model, the third bearing is sleeved on the outside of the motor rotor to form a new support for the eccentric shaft. When the lateral bending of the eccentric shaft exceeds a certain range, it provides a limiting and supporting effect on the eccentric shaft, avoiding friction failure of the motor and thus ensuring the reliability of the compressor during high-speed operation. At the same time, the third bearing is connected to the housing, ensuring the stability of the third bearing and avoiding motor failure due to friction.
[0045] Example 2
[0046] This utility model discloses a motor assembly structure for a compressor, including a housing 9, a motor 2 disposed inside the housing 9, and a third bearing 1, a first bearing 3, and a second bearing 4 arranged sequentially from top to bottom around the motor 2; the first bearing 3 is sleeved on the middle part of the eccentric shaft, the second bearing 4 is sleeved on the lower part of the eccentric shaft, and the third bearing 1 is sleeved on the upper part of the eccentric shaft. The third bearing 1 is connected to the housing 9, and the third bearing 1 is connected to the housing 9 through a bracket 6.
[0047] Furthermore, the bracket 6 is welded to the housing 9, and a threaded hole is opened on each bracket 6. The bracket 6 is connected to the third bearing 1 by bolts 8.
[0048] Furthermore, there are several brackets 6 distributed circumferentially, and these brackets 6 are evenly distributed. The evenly distributed brackets are fixedly connected to the shell. The third bearing body is installed in a detachable manner, which reduces the difficulty of concentric adjustment between the third bearing bush and the eccentric shaft and helps to ensure the support effect of the third bearing structure on the eccentric shaft.
[0049] Example 3
[0050] This utility model discloses a motor assembly structure for a compressor, including a housing 9. A motor 2 is housed within the housing 9. A third bearing 1, a first bearing 3, and a second bearing 4 are arranged sequentially from top to bottom around the motor 2. The first bearing 3 is fitted onto the middle of an eccentric shaft, the second bearing 4 is fitted onto the lower part of the eccentric shaft, and the third bearing 1 is fitted onto the upper part of the eccentric shaft. The third bearing 1 is connected to the housing 9 via a bracket 6. Specifically, the bracket 6 is welded to the housing 9, and each bracket 6 has a threaded hole. The bracket 6 is connected to the third bearing 1 via bolts 8. Four brackets 6 are distributed circumferentially. See [reference needed]. Figure 4 .
[0051] Example 4
[0052] This utility model discloses a motor assembly structure for a compressor, including a housing 9. A motor 2 is housed within the housing 9. A third bearing 1, a first bearing 3, and a second bearing 4 are arranged sequentially from top to bottom around the motor 2. The first bearing 3 is fitted onto the middle of an eccentric shaft, the second bearing 4 is fitted onto the lower part of the eccentric shaft, and the third bearing 1 is fitted onto the upper part of the eccentric shaft. The third bearing 1 is connected to the housing 9 via a bracket 6. The bracket 6 is welded to the housing 9, and each bracket 6 has a threaded hole. The bracket 6 is connected to the third bearing 1 via bolts 8. Six brackets 6 are distributed circumferentially. See [reference needed]. Figure 5 .
[0053] Large-displacement rotary compressors inevitably employ large motor rotors. When the compressor operates at high speeds, the centrifugal force of the motor rotor is significant. For the eccentric shaft mounted in a cantilever beam structure, this can result in substantial lateral bending, making the motor prone to friction failure. Adding a third bearing on the upper side of the motor provides additional support for the eccentric shaft. When the lateral bending of the eccentric shaft exceeds a certain range, it provides limiting and support, preventing motor friction failure and ensuring the reliability of the compressor during high-speed operation.
[0054] Example 5
[0055] This embodiment discloses a bearing, including a third bearing body 5, on which a threaded hole is formed for connecting a housing 9; a connecting shaft hole is provided in the middle of the third bearing body 5, and the axial height of the connecting shaft hole is greater than the axial height of the third bearing body 5; the connecting shaft hole is assembled with the eccentric shaft of the compressor motor.
[0056] A connecting shaft hole is provided in the middle of the third bearing body. The axial height of the connecting shaft hole is greater than the axial height of the third bearing body. The connecting shaft hole is assembled with the eccentric shaft of the compressor, which can better constrain the lateral bending of the eccentric shaft. When the compressor is running at high speed, it reduces the lateral bending of the eccentric shaft caused by the centrifugal force on the motor rotor, and avoids motor failure due to friction.
[0057] Example 6
[0058] This embodiment discloses a bearing, including a third bearing body 5, on which a threaded hole is formed for connecting a housing 9; a connecting shaft hole is provided in the middle of the third bearing body 5, and the axial height of the connecting shaft hole is greater than the axial height of the third bearing body 5; the connecting shaft hole is assembled with the eccentric shaft of the compressor, and a bushing 7 is provided in the connecting shaft hole, with the bushing 7 and the connecting shaft hole having an interference fit.
[0059] For large-scale compressors, the centrifugal force of the motor rotor is significant, resulting in a large eccentric shaft misalignment during high-speed operation. This can easily lead to motor failure due to friction between the stator and rotor. In this embodiment 1, when the compressor rotates at high speed, the eccentric shaft exhibits a certain degree of misalignment under the centrifugal force of the motor rotor. As the speed increases, the misalignment continues to increase. When the upper part of the eccentric shaft contacts the bushing, the bushing, supported by the third bearing body, limits the further increase in the eccentric shaft misalignment, thus confining the misalignment within a certain range and ensuring the safety and reliability of the motor.
[0060] Example 7
[0061] This embodiment discloses a compressor, including the assembly structure described in this embodiment. During compressor assembly, the upper part of the eccentric shaft is inserted into the bushing 7 of the third bearing structure 1. The size of the bracket 6 does not exceed the size of the tangential edge 10 of the motor stator and does not affect the assembly of the motor stator 11. Specifically, the cross-section of the bracket 6 is smaller than the cross-section of the tangential edge 10 of the motor stator. The assembly sequence of the bracket 6 is flexible and can be assembled before or after the motor stator 11.
[0062] A third bearing is added to the upper side of the motor to provide new support for the eccentric shaft. When the lateral bending of the eccentric shaft exceeds a certain range, it provides limiting and support to the eccentric shaft, preventing motor friction failure and ensuring the reliability of the compressor during high-speed operation.
[0063] Furthermore, the third bearing structure inside the compressor has limits in all directions, ensuring structural safety and reliability; the installation sequence of the motor stator and bracket is flexible and can be selected according to actual conditions.
[0064] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.
Claims
1. A motor assembly structure for a compressor, characterized in that, Includes a housing (9), inside which a motor (2) is installed, and around the motor (2) from top to bottom, a third bearing (1), a first bearing (3), and a second bearing (4) are arranged sequentially. The first bearing (3) is sleeved in the middle of the eccentric shaft, the second bearing (4) is sleeved in the lower part of the eccentric shaft, and the third bearing (1) is sleeved in the upper part of the eccentric shaft. The third bearing (1) is connected to the housing (9).
2. The motor assembly structure for a compressor according to claim 1, characterized in that, The third bearing (1) is connected to the housing (9) via a bracket (6).
3. The motor assembly structure for a compressor according to claim 2, characterized in that, The bracket (6) is welded to the housing (9), and the bracket (6) is connected to the third bearing (1) by bolts (8).
4. The motor assembly structure for a compressor according to claim 2, characterized in that, The support (6) has several circumferentially distributed components.
5. The motor assembly structure for a compressor according to claim 4, characterized in that, The support (6) has four circumferentially distributed components.
6. The motor assembly structure for a compressor according to claim 2, characterized in that, The cross-sectional area of the bracket (6) is smaller than the cross-sectional area of the cut edge of the motor stator to be assembled.
7. A bearing used in the assembly structure of claim 1, characterized in that, Includes a third bearing body (5), on which a threaded hole is provided for connecting the housing (9); The third bearing body (5) is provided with a connecting shaft hole in the middle, and the axial height of the connecting shaft hole is greater than the axial height of the third bearing body (5). The connecting shaft hole is assembled with the eccentric shaft.
8. A bearing according to claim 7, characterized in that, A bushing (7) is provided inside the connecting shaft hole.
9. A bearing according to claim 8, characterized in that, The bushing (7) is interference-fitted with the connecting shaft hole.
10. A compressor, characterized in that, Includes the assembly structure described in any one of claims 1-6.