An end cover structure for an electric motor

Abstract

This utility model relates to the field of motor technology, and particularly to an end cover structure for a motor, including an end cover and a bearing bushing. The bearing bushing is embedded in the bearing chamber of the end cover, and the expansion coefficients of the bearing bushing and the bearing outer ring are the same. The outer ring of the bearing bushing has a second flow channel that communicates with a first flow channel on the end cover. The bearing bushing of this utility model, embedded in the bearing chamber of the end cover, and having the same expansion coefficients as the bearing outer ring, ensures that the bearing bushing and bearing maintain an optimal transition fit when the ambient temperature changes, preventing both high-temperature loosening and low-temperature seizing. The second flow channel on the outer ring of the bearing bushing, connected to the first flow channel on the end cover, allows for the injection of a highly thermally conductive liquid into the flow channel. The heat generated on the bearing during motor operation can be rapidly exchanged between the liquid on the outer ring of the bearing and the cooling liquid on the outside of the end cover, thereby reducing the bearing temperature.

Description

Technical Field

[0001] This utility model relates to the field of motor technology, and in particular to an end cover structure for a motor. Background Technology

[0002] The outdoor unit motor of a household air conditioner operates for extended periods in harsh environments characterized by high temperature, high humidity, and vibration. The lifespan of its bearings is crucial to the overall reliability and quietness of the unit. Extreme temperature variations cause differences in the coefficients of thermal expansion between aluminum alloy or powder metallurgy bearing housings and the outer ring of steel bearings, leading to changes in the clearance of the bearing balls and accelerating wear. Simultaneously, high temperatures can cause premature oxidation and drying of the bearing grease, ultimately resulting in failure. Utility Model Content

[0003] This invention solves the problems in related technologies and proposes an end cover structure for an electric motor. The bearing bushing is embedded in the bearing chamber of the end cover, and the expansion coefficient of the bearing bushing and the outer ring of the bearing are the same. This ensures that the bearing bushing and the bearing always maintain the best transition fit when the ambient temperature changes, preventing both high-temperature loosening and low-temperature seizing. The outer ring of the bearing bushing has a second flow channel that is connected to the first flow channel on the end cover. A liquid with high thermal conductivity is injected into the flow channel. The heat generated on the bearing by the motor operation can be quickly exchanged between the liquid on the outer ring of the bearing and the cooling liquid on the outside of the end cover, thereby achieving the purpose of reducing the bearing temperature.

[0004] To solve the above-mentioned technical problems, this utility model is achieved through the following technical solution: an end cover structure for an electric motor, including an end cover and a bearing bushing, wherein the bearing bushing is embedded in the bearing chamber of the end cover and the bearing bushing has the same coefficient of expansion as the outer ring of the bearing, and the outer ring of the bearing bushing has a second flow channel that communicates with a first flow channel on the end cover.

[0005] As a preferred embodiment, the outer peripheral surface of the end cap is provided with a plurality of heat dissipation ribs along the circumferential direction.

[0006] As a preferred embodiment, the end cap includes a cylindrical body and a cover for closing one end of the cylindrical body, wherein a cylindrical bearing chamber is provided on one side of the cover inside the cylindrical body.

[0007] As a preferred embodiment, the cover body is provided with several sets of reinforcing ribs on one side of the cylinder body. Each set of reinforcing ribs is radially arranged with the cylinder body as the center. Each set of reinforcing ribs consists of at least two reinforcing ribs and there are gaps between the reinforcing ribs in each set.

[0008] As a preferred embodiment, the cover is provided with a wire outlet hole.

[0009] As a preferred embodiment, the outer periphery of the open end of the cylinder is provided with multiple mounting ears.

[0010] As a preferred embodiment, the inner wall of the cylinder is provided with a circumferential stop.

[0011] Compared with the prior art, the beneficial effects of this utility model are as follows: The bearing bushing of this utility model is embedded in the bearing chamber of the end cover. The expansion coefficient of the bearing bushing and the outer ring of the bearing are the same, which can ensure that the bearing bushing and the bearing always maintain the best transition fit when the ambient temperature changes. This prevents loosening at high temperature and avoids seizing at low temperature. The outer ring of the bearing bushing has a second flow channel that is connected to the first flow channel on the end cover. A liquid with high thermal conductivity is injected into the flow channel. The heat generated on the bearing by the motor operation can be quickly exchanged between the liquid on the outer ring of the bearing and the cooling liquid on the outside of the end cover, thereby achieving the purpose of reducing the bearing temperature. Several heat dissipation ribs are provided along the circumferential direction on the outer circumferential surface of the end cover for heat dissipation. Several sets of reinforcing ribs are also provided on one side of the cover body located inside the cylinder to increase the strength of the end cover. There are gaps between the reinforcing ribs in each set for the drainage of condensate, which helps to maintain a dry environment inside the motor. A stop is provided along the circumferential direction on the inner wall of the end cover. The stop acts as a limit for the stator, effectively preventing the stator from moving excessively downward during motor operation or assembly. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the end cap structure of this utility model; Figure 3 This is a schematic diagram of the end cap structure of this utility model; Figure 4 This is a schematic diagram of the structure of the bearing bushing of this utility model.

[0013] In the picture: 1. End cap, 11. Cylinder body, 12. Cover body, 13. Bearing chamber, 14. Outlet hole, 15. Mounting ear plate, 16. First flow channel, 17. Heat dissipation fin, 18. Reinforcing fin, 19. Stop, 2. Bearing bushing, 21. Second flow channel. Detailed Implementation

[0014] The technical solutions of the present utility model 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 utility model, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present utility model or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0015] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0016] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0017] In the description of this utility model, it should be understood that the directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" 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 utility model and simplifying the description. Unless otherwise stated, these directional terms 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 scope of protection of this utility model. The directional terms "inner" and "outer" refer to the inner and outer contours of each component itself.

[0018] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0019] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this utility model.

[0020] like Figures 1 to 4 As shown, an end cover structure for an electric motor includes an end cover 1 and a bearing bushing 2. The bearing bushing 2 is embedded in the bearing chamber 13 of the end cover 1. The bearing bushing 2 has the same coefficient of thermal expansion as the outer ring of the bearing. The bearing bushing 2 can ensure that it always maintains the best transition fit with the bearing when the ambient temperature changes, preventing both high-temperature loosening and low-temperature seizing. The outer ring of the bearing bushing 2 has a second flow channel 21 that communicates with the first flow channel 16 on the end cover 1. A liquid with high thermal conductivity is injected into the flow channel. The heat generated on the bearing by the motor operation can be quickly exchanged between the liquid on the outer ring of the bearing chamber 13 and the cooling liquid on the outside of the end cover 1, thereby achieving the purpose of reducing the bearing temperature.

[0021] In one embodiment, a plurality of heat dissipation ribs 17 are provided on the outer peripheral surface of the end cover 1 along the circumferential direction. The heat dissipation ribs 17 can be used for heat dissipation of the end cover 1. In this embodiment, there are multiple sets of heat dissipation ribs 17, and each set has 3-5 heat dissipation ribs 17.

[0022] In one embodiment, the end cap 1 includes a cylindrical body 11 and a cover 12 for closing one end of the cylindrical body 11. The cylindrical body 11 and the cover 12 are integrally formed, and a cylindrical bearing chamber 13 is provided on one side of the cover 12 inside the cylindrical body 11.

[0023] In one embodiment, the cover 12 is provided with a number of sets of reinforcing ribs 18 on one side inside the cylinder 11. Each set of reinforcing ribs 18 is radially arranged around the cylinder 11 to increase strength. Each set of reinforcing ribs 18 consists of at least two reinforcing ribs 18 and there is a gap between each set of reinforcing ribs 18. This gap can be used for the drainage of condensate, which helps to maintain a dry environment inside the motor.

[0024] In one embodiment, the cover 12 has a wire outlet hole 14 for wire outlet.

[0025] In one embodiment, a plurality of mounting lugs 15 are provided on the outer periphery of the open end of the cylinder 11. In this embodiment, there are four large mounting lugs distributed on both sides and two small mounting lugs distributed between the large mounting lugs, so that they can be installed with the housing of the motor.

[0026] In one embodiment, a stop 19 is provided around the inner wall of the cylinder 11 in the circumferential direction. The stop 19 plays a limiting role for the stator, effectively preventing the stator from moving excessively downward during motor operation or assembly.

[0027] The above are preferred embodiments of this utility model. Those skilled in the art can make changes and modifications to the above embodiments. Therefore, this utility model is not limited to the specific embodiments described above. Any obvious improvements, substitutions or modifications made by those skilled in the art based on this utility model shall fall within the protection scope of this utility model.

Claims

1. An end cover structure for an electric motor, characterized in that: Includes an end cap (1) and a bearing bush (2). The bearing bush (2) is embedded in the bearing chamber (13) of the end cap (1) and the bearing bush (2) has the same coefficient of expansion as the outer ring of the bearing. The outer ring of the bearing bush (2) has a second flow channel (21) that is connected to the first flow channel (16) on the end cap (1).

2. The end cover structure of the motor according to claim 1, characterized in that: The outer circumferential surface of the end cap (1) is provided with several heat dissipation ribs (17) along the circumferential direction.

3. The end cover structure of the motor according to claim 1, characterized in that: The end cap (1) includes a cylindrical body (11) and a cover (12) for closing one end of the cylindrical body (11). The cover (12) has a cylindrical bearing chamber (13) on one side inside the cylindrical body (11).

4. The end cover structure of the motor according to claim 3, characterized in that: The cover (12) is provided with several sets of reinforcing ribs (18) on one side inside the cylinder (11). Each set of reinforcing ribs (18) is radial with the cylinder (11) as the center. Each set of reinforcing ribs (18) consists of at least two reinforcing ribs (18) and there is a gap between each set of reinforcing ribs (18).

5. The end cover structure of the motor according to claim 3, characterized in that: The cover (12) has a wire outlet hole (14).

6. The end cover structure of the motor according to claim 3, characterized in that: The outer periphery of the open end of the cylinder (11) is provided with a plurality of mounting ear plates (15).

7. The end cover structure of the motor according to claim 3, characterized in that: The inner wall of the cylinder (11) is provided with a ring of stop (19) along the circumference.

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