Bearing assembly and motor

Abstract

The invention provides a bearing assembly and a motor, the bearing assembly comprises a motor end cover, a first gland, a second gland, a bearing and an impeller, the first gland is arranged at one axial end of the motor end cover, and the second gland is arranged at the other axial end of the motor end cover; the first gland, the motor end cover and the second gland are all located on the periphery of a motor rotating shaft, a bearing chamber is defined by the first gland, the motor end cover and the second gland and the motor rotating shaft, the bearing and the impeller are both arranged in the bearing chamber, and the impeller is arranged on the periphery of the motor rotating shaft in a sleeving mode and can integrally rotate along with the motor rotating shaft. The impeller is located in a first space between the first gland and the bearing so that at least part of oil can be prevented from being sprayed to the first gland. According to the bearing gland, the situation that lubricating is affected due to the fact that the amount of circulating lubricating oil is reduced due to the fact that grease adheres to the inner wall of the gland can be prevented, and the problem that lubrication fails due to the fact that grease adheres to the inner wall of the bearing gland is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of motors, and in particular to a bearing assembly and a motor. Background Art

[0002] Permanent magnet synchronous motors can be used for variable frequency speed regulation and have the advantages of low temperature rise, high power density, good starting performance, high light load efficiency, small size and light weight, etc. They have become a hot topic in the field of motor research. With the advancement of the national energy conservation and emission reduction policies, high-consumption enterprises in all walks of life are carrying out energy-saving transformation.

[0003] In order to achieve energy-saving targets, most companies give priority to the transformation of high-power motors. Since high-power motors all use open bearings, they need to be independently injected with bearing grease for lubrication. Through research and paper review, it is found that the life of the motor mainly depends on the life of the bearing, but the life of the bearing is mainly related to the ambient temperature of the bearing, shaft extension stress and grease quality; in order to ensure the reliable operation of the motor, improving the life of the bearing is a key issue that technicians in this field need to solve urgently.

[0004] Since the motor bearings in the prior art have technical problems such as grease adhering to the inner wall of the bearing gland causing lubrication failure, the present invention studies and designs a bearing assembly and a motor. Summary of the invention

[0005] Therefore, the technical problem to be solved by the present invention is to overcome the defect of the motor bearing in the prior art that grease adheres to the inner wall of the bearing gland and causes lubrication failure, thereby providing a bearing assembly and a motor.

[0006] In order to solve the above problems, the present invention provides a bearing assembly, which includes:

[0007] A motor end cover, a first pressure cover, a second pressure cover, a bearing and an impeller, wherein the first pressure cover is arranged at one axial end of the motor end cover, and the second pressure cover is arranged at the other axial end of the motor end cover. The first pressure cover, the motor end cover and the second pressure cover are all located at the outer periphery of the motor shaft and form a bearing chamber with the motor shaft. The bearing and the impeller are both arranged in the bearing chamber. The impeller is sleeved on the outer periphery of the motor shaft and can rotate integrally with the motor shaft. The impeller is located in a first space between the first pressure cover and the bearing to block at least part of the oil from being sprayed onto the first pressure cover.

[0008] In some embodiments,

[0009] The bearing comprises an inner ring and an outer ring, wherein the inner ring is sleeved on the outer circumference of the motor shaft and can rotate integrally with the motor shaft, the outer ring is fixed to the inner circumferential wall of the motor end cover, an axial channel is provided between the inner ring and the outer ring, a rolling body is provided in the axial channel, the impeller is opposite to the axial channel, and the impeller completely blocks the axial channel within the axial projection plane of the motor shaft to prevent at least part of the oil from the axial channel from being sprayed onto the inner wall of the first pressure cover.

[0010] In some embodiments,

[0011] The impeller and the bearing have a gap greater than 0 in the axial direction of the motor shaft, so that the axial channel of the bearing is connected with the first space through the gap, so that lubricating oil can enter the first space through the axial channel and the gap.

[0012] In some embodiments,

[0013] A first channel is provided on the first pressure cover, and a second channel is provided on the motor end cover. The first channel can introduce oil from the outside of the first pressure cover, one end of the second channel is connected to the first channel, and the other end of the second channel is connected to the bearing chamber to conduct the oil into the bearing chamber.

[0014] In some embodiments,

[0015] The second channel extends along the axial direction of the motor shaft, and a second space is defined between the second pressure cover and the bearing. The bearing chamber includes the second space, and the other end of the second channel is connected to the second space so that lubricating oil can be guided into the second space and enter the axial channel of the bearing through the second space.

[0016] In some embodiments,

[0017] It also includes an external heat dissipation pipe, one end of which is passed upward from the outer lower end of the first pressure cover into the interior of the first pressure cover to communicate with the first space, and the other end of the external heat dissipation pipe is communicated with the first channel on the first pressure cover to conduct the lubricating oil in the first space to the first channel through the external heat dissipation pipe at its lower end.

[0018] In some embodiments,

[0019] The first channel is located at the upper end of the first pressure cover, and the first channel extends along the axial direction of the motor shaft. The first pressure cover is also provided with an injection port, and the injection port extends downward from the outer upper end of the first pressure cover into the interior of the first pressure cover along the vertical direction until it is connected with the first channel, and the other end of the external heat dissipation pipe is connected with the injection port to be connected with the first channel through the injection port.

[0020] In some embodiments,

[0021] The oil in the external heat dissipation pipe can also be cooled by the airflow outside the first pressure cover, and the oil in the external heat dissipation pipe can also be cooled by the airflow driven by the cooling fan of the motor.

[0022] In some embodiments,

[0023] The impeller comprises a circular ring and blades, wherein the blades are connected to the outer peripheral wall of the circular ring and protrude outward, the circular ring is interference-fitted on the outer peripheral wall of the motor shaft, and there are a plurality of blades, which are spaced apart along the circumference of the circular ring.

[0024] The present invention also provides a motor, which comprises the above-mentioned bearing assembly.

[0025] A bearing assembly and a motor provided by the present invention have the following beneficial effects:

[0026] 1. The present invention arranges an impeller inside the bearing chamber, and the impeller is sleeved with the outer circumference of the motor shaft and can move integrally with the motor shaft, thereby achieving the function of driving and stirring the oil inside the bearing chamber and improving the utilization rate of the grease. At the same time, the impeller is also located in the first space between the first pressure cover and the bearing, and can block at least part of the oil from being sprayed and attached to the first pressure cover, preventing the grease from adhering to the inner wall of the pressure cover and causing a reduction in the amount of circulating lubricating oil to affect lubrication, thereby solving the problem of lubrication failure caused by the grease adhering to the inner wall of the bearing pressure cover. In addition, the present invention can drive the flow of oil and accelerate its flow through the impeller structure (the structure of the bearing grease circulation fan), thereby further improving the cooling and heat dissipation effect on the bearing, reducing the operating temperature of the bearing, improving the grease quality, and improving the reliability of the motor.

[0027] 2. The present invention also provides an external heat dissipation pipe on the outside of the gland, so that the lubricating oil at the bottom of the first space inside the first gland can be exported after lubrication and heat dissipation, and the oil is further introduced into the first channel of the first gland after effective heat dissipation on the outside of the gland, thereby completing the oil circulation, and the oil after cooling and heat dissipation on the outside can further enter the inside of the bearing chamber, cool and lubricate the heat-generating components such as the bearing again, which can further improve the heat dissipation and lubrication effect of the bearing, further increase the life of the bearing, and improve the reliability of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is the whole machine structure diagram of the motor of the present invention;

[0029] Figure 2 yes Figure 1 A partial enlarged view of part A;

[0030] Figure 3 It is a structural diagram of the impeller (grease circulation fan) of the present invention;

[0031] Figure 4 It is a structural schematic diagram of an external heat dissipation pipe of the present invention;

[0032] Figure 5 It is a curve chart comparing the motor life of the present invention with that of the prior art.

[0033] The reference numerals are as follows:

[0034] 1. Motor end cover; 2. Second pressure cover; 3. Bearing; 4. Motor shaft; 5. First pressure cover; 6. Impeller; 7. Bearing chamber; 8. First space; 9. Axial channel; 10. Rolling body; 11. First channel; 12. Second channel; 13. Second space; 14. External heat dissipation pipe; 15. Injection port. DETAILED DESCRIPTION

[0035] 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, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0037] Unless otherwise specifically stated, the relative arrangement of the parts and steps described in these embodiments, numerical expressions and numerical values ​​do not limit the scope of the present invention. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be regarded as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0038] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the devices or elements referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention. The directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0039] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0040] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0041] like Figure 1-5As shown, the present invention provides a bearing assembly, which includes:

[0042] A motor end cover 1, a first pressure cover 5, a second pressure cover 2, a bearing 3 and an impeller 6, wherein the first pressure cover 5 is arranged at one axial end of the motor end cover 1, and the second pressure cover 2 is arranged at the other axial end of the motor end cover 1. The first pressure cover 5, the motor end cover 1 and the second pressure cover 2 are all located at the outer periphery of the motor shaft 4 and form a bearing chamber 7 with the motor shaft 4. The bearing 3 and the impeller 6 are both arranged in the bearing chamber 7. The impeller 6 is sleeved on the outer periphery of the motor shaft 4 and can rotate integrally with the motor shaft 4. The impeller 6 is located in a first space 8 between the first pressure cover 5 and the bearing 3 to prevent at least part of the oil from being sprayed onto the first pressure cover 5.

[0043] The present invention arranges an impeller inside the bearing chamber, and the impeller is sleeved with the outer circumference of the motor shaft and can move integrally with the motor shaft, thereby achieving the function of driving and stirring the oil inside the bearing chamber and improving the utilization rate of the grease. At the same time, the impeller is also located in the first space between the first pressure cover and the bearing, and can block at least part of the oil from being sprayed and attached to the first pressure cover, preventing the grease from adhering to the inner wall of the pressure cover and causing a reduction in the amount of circulating lubricating oil to affect lubrication, thereby solving the problem of lubrication failure caused by the grease adhering to the inner wall of the bearing pressure cover. In addition, the present invention can drive the flow of oil and accelerate its flow through the impeller structure (the structure of the bearing grease circulation fan), thereby further improving the cooling and heat dissipation effect on the bearing, reducing the operating temperature of the bearing, improving the grease quality, and improving the reliability of the motor.

[0044] The grease circulation fan (impeller) structure of the bearing of the present invention has an interference fit with the rotating shaft and is fastened to the rotating shaft. As the motor runs, a force is formed toward the N end (or tail end, i.e., toward the second gland 2) of the motor to block the grease and prevent it from adhering to the inner wall of the bearing gland (to prevent it from adhering to the first gland 5, the first gland is the outer cover, and the second gland is the inner cover), thereby solving the problem of grease failure (the D end of the motor is the front end, i.e., the end toward the first gland 5).

[0045] The grease circulation fan structure of the bearing of the present invention improves the utilization rate of grease. Through the operation of the circulation fan, the bearing grease is pushed to the bearing end and fully adhered to the bearing, thereby ensuring the lubricity of the bearing and effectively reducing the injection weight of the grease. The grease circulation fan structure of the bearing of the present invention ensures full contact between the grease and the bearing, reduces friction loss, and indirectly reduces the operating temperature of the bearing; it simultaneously allows the grease to be fully stirred, avoiding the situation in which the quality of the grease is reduced due to the long-term local use of grease in traditional structures; it improves the effects of the two major factors that affect the life of the bearing (lubrication and cooling), thereby improving the reliability of the motor.

[0046] In some embodiments,

[0047] The bearing 3 includes a bearing inner ring and a bearing outer ring. The bearing inner ring is sleeved on the outer circumference of the motor shaft 4 and can rotate integrally with the motor shaft 4. The bearing outer ring is fixed to the inner circumferential wall of the motor end cover 1. An axial channel 9 is provided between the bearing inner ring and the bearing outer ring. A rolling body 10 is provided in the axial channel 9. The impeller 6 is opposite to the axial channel 9. In the axial projection plane of the motor shaft 4, the impeller 6 completely blocks the axial channel 9 to prevent at least part of the oil from the axial channel 9 from being sprayed onto the inner wall of the first pressure cover 5.

[0048] This is the preferred structural form of the bearing assembly of the present invention. The bearing includes an inner and outer ring of the bearing, and an axial channel is provided between the inner and outer rings, in which rolling bodies can be arranged. The axial channel is a channel through which lubricating oil flows, thereby lubricating the rolling rolling bodies, thereby achieving the purpose of lubricating and dissipating heat and cooling the bearing friction parts. In addition, the impeller of the present invention completely blocks the axial channel within the axial projection surface of the motor shaft, and can block the oil from the axial channel to the greatest extent, preventing the oil cup from spraying onto the inner wall of the first pressure cover, and can further prevent grease from adhering to the inner wall of the pressure cover, resulting in a reduction in the amount of circulating lubricating oil and affecting the lubrication effect, further solving the problem of lubrication failure caused by grease adhering to the inner wall of the bearing pressure cover, and utilizing the rotating impeller to improve the lubrication effect and heat dissipation and cooling effect on the bearing.

[0049] In some embodiments,

[0050] In the axial direction of the motor shaft 4, the impeller 6 and the bearing 3 have a gap greater than 0, so that the axial channel 9 of the bearing 3 is connected with the first space 8 through the gap, so that the lubricating oil can enter the first space 8 through the axial channel 9 and the gap.

[0051] The present invention further provides a gap greater than 0 between the impeller and the bearing in the axial direction, so that the oil from the axial channel can be introduced into the first space through the gap to avoid splashing onto the inner wall of the first pressure cover, thereby achieving cooling and lubricating the bearing while avoiding oil splashing onto the inner wall of the first pressure cover to prevent adhesion, and the oil entering the first space can be guided out through an external heat dissipation pipe for heat dissipation, thereby achieving oil circulation and improving the heat dissipation efficiency and lubrication efficiency of the bearing.

[0052] In some embodiments,

[0053] A first channel 11 is provided on the first pressure cover 5, and a second channel 12 is provided on the motor end cover 1. The first channel 11 can introduce oil from the outside of the first pressure cover 5. One end of the second channel 12 is connected to the first channel 11, and the other end of the second channel 12 is connected to the bearing chamber 7 to conduct the oil into the bearing chamber 7.

[0054] The present invention can also introduce oil from the outside through the first channel arranged on the first pressure cover and the second channel arranged on the motor end cover, and guide the oil to the bearing chamber through the transmission of the second channel, thereby achieving lubrication and heat dissipation of the bearing in the bearing chamber.

[0055] In some embodiments,

[0056] The second channel 12 extends along the axial direction of the motor shaft 4. A second space 13 is defined between the second gland 2 and the bearing 3. The bearing chamber 7 includes the first space 8 and the second space 13. The other end of the second channel 12 is connected to the second space 13 so that the lubricating oil can be guided into the second space 13 and enter the axial channel 9 of the bearing 3 through the second space 13.

[0057] This is the preferred structural form of the second channel and the bearing chamber of the present invention. The second channel preferably extends in the axial direction. The bearing chamber includes a first space and a second space. The second space is the space between the second pressure cover and the bearing. The second space is used to receive the lubricating oil transmitted from the second channel and guide the oil to the axial channel of the bearing.

[0058] In some embodiments,

[0059] It also includes an external heat dissipation pipe 14, one end of which is inserted upward from the lower end of the outer side of the first pressure cover 5 into the interior of the first pressure cover 5 to communicate with the first space 8, and the other end of the external heat dissipation pipe 14 is communicated with the first channel 11 on the first pressure cover 5 to conduct the lubricating oil in the first space 8 to the first channel 11 through the external heat dissipation pipe 14 at its lower end.

[0060] The present invention also arranges an external heat dissipation pipe on the outside of the gland, so that the lubricating oil at the bottom of the first space inside the first gland can be exported after lubrication and heat dissipation, and the oil is further passed into the first channel of the first gland after effective heat dissipation on the outside of the gland, thereby completing the oil circulation, and the oil after cooling and heat dissipation on the outside can further enter the inside of the bearing chamber, cool and lubricate the heat-generating components such as the bearing again, which can further improve the heat dissipation and lubrication effect of the bearing, further increase the life of the bearing, and improve the reliability of the motor.

[0061] In some embodiments,

[0062] The first channel 11 is located at the upper end of the first pressure cover 5. The first channel 11 extends along the axial direction of the motor shaft 4. The first pressure cover 5 is also provided with an injection port 15. The injection port 15 extends downward from the outer upper end of the first pressure cover 5 into the interior of the first pressure cover 5 along the vertical direction until it is connected with the first channel 11. The other end of the external heat dissipation pipe 14 is connected with the injection port 15 to be connected with the first channel 11 through the injection port 15.

[0063] This is a further preferred structural form of the bearing assembly of the present invention. The first channel and the injection port are both located at the upper end of the first gland. Lubricating oil is introduced through the injection port and injected into the first channel from top to bottom. The oil is then introduced into the bearing chamber through the second channel, and the oil is guided out through one end of the external heat dissipation pipe at the lower end of the first gland. The oil is then guided back to the injection port at the upper end of the first gland outside the first gland, thereby realizing the circulation of oil and improving its fluidity, which can improve the lubrication and heat dissipation effects on the bearing.

[0064] In some embodiments,

[0065] The oil in the external heat dissipation pipe 14 can also be cooled by the airflow outside the first pressure cover 5, and the oil in the external heat dissipation pipe 14 can also be cooled by the airflow driven by the cooling fan of the motor.

[0066] The external heat dissipation pipe of the present invention is outside the first pressure cover and can be cooled by external natural air or by the airflow driven by the cooling fan of the motor, thereby further improving the heat dissipation and cooling effect of the lubricating oil and further improving the heat dissipation and lubrication performance of the bearing.

[0067] In some embodiments,

[0068] The impeller 6 includes a circular ring and blades, wherein the blades are connected to the outer peripheral wall of the circular ring and protrude outward, and the circular ring is interference-fitted on the outer peripheral wall of the motor shaft 4. There are multiple blades, and the multiple blades are arranged at intervals along the circumference of the circular ring.

[0069] This is the preferred structural form of the impeller of the present invention, which can rotate integrally with the rotation of the motor shaft, thereby driving the lubricating oil to be continuously introduced from the injection port, cooling and lubricating the bearing in the bearing chamber, and finally being discharged through the external heat dissipation pipe. The lubricating oil after being cooled by air on the outside further enters the first pressure cover, realizing the circulation of oil, and further improving the lubrication and cooling effects on the bearing.

[0070] The present invention also provides a motor, which comprises the above-mentioned bearing assembly.

[0071] The motor of the present invention has the following beneficial effects:

[0072] 1. The grease circulation fan structure of the bearing of the present invention can solve the failure problem caused by grease adhering to the inner wall of the bearing gland.

[0073] 2. The grease circulation fan structure of the bearing of the present invention can improve the utilization rate of grease and reduce the amount of grease injected.

[0074] 3. The grease circulation fan structure of the bearing of the present invention can reduce the operating temperature of the bearing, improve the quality of grease, and improve the reliability of the motor.

[0075] The reliability of existing high-power motors is very high. Problems are usually caused by bearings, so bearing maintenance is very important. Since high-power motors all use open bearings, they need to be injected with grease for use to ensure the lubricity of the bearings. Through research and paper review, it is found that the life of the motor mainly depends on the life of the bearing, but the life of the bearing is mainly related to the ambient temperature of the bearing, shaft extension stress and grease quality; in order to ensure the reliable operation of the motor, improving the life of the bearing is a key issue that technicians in this field need to solve urgently.

[0076] Traditional motors use inner and outer glands to fix the bearings in the end cover bearing chamber. However, in order to reduce costs and weight, the bearing gland is hollowed out, resulting in a larger space in the bearing chamber. When injecting grease, it is not known whether the entire bearing is completely covered, so the bearing chamber needs to be filled up, which increases the amount of grease used and increases the cost of the motor. When the motor is running, the outer ring of the bearing and the gland are stationary, and only the shaft drives the inner ring of the bearing to rotate, which will cause the grease to overflow into the inner and outer glands, causing most of the grease to adhere to the surface of the gland, losing the bearing lubrication function, increasing the mechanical friction of the bearing, and greatly reducing the bearing life.

[0077] The present invention provides a motor, such as Figure 1 This motor uses a new bearing system structure, such as Figure 2 The enlarged view of the motor bearing system, the bearing system structure consists of the motor end cover 1, the second gland 2, the first gland 5, the bearing 3, the motor shaft 4 and the bearing grease circulation fan (impeller 6); the motor bearing grease is injected into the bearing system through the upper end oiling nozzle, and the bearing grease circulation fan structure is invented, such as Figure 4 , 5 , improve the utilization rate of grease; through the operation of the circulating fan, the bearing grease is pushed to the motor bearing, so that the bearing grease is fully attached to the bearing, ensuring the lubricity of the bearing, effectively reducing the injection weight of grease, and greatly reducing the cost of the motor.

[0078] The bearing grease circulation fan structure of the present invention is as follows: Figure 2 , 3The circulating fan structure has an interference fit with the rotating shaft and is fastened to the rotating shaft. As the motor rotates, a force is formed toward the N end of the motor to block the grease and prevent it from adhering to the inner wall of the bearing cover. It can even absorb the grease on the inner wall of the bearing cover to the bearing end, solving the problem of grease failure.

[0079] The bearing grease circulation fan in the novel bearing system structure of the present invention ensures sufficient contact between the grease and the bearing, reduces the friction loss of the bearing, avoids the problem of bearing temperature rise caused by bearing friction, and greatly improves the life of the bearing; at the same time, the grease is fully stirred, avoiding the long-term local use of grease in traditional structures, which leads to a decline in grease quality and failure of bearing lubrication.

[0080] The present invention avoids the two major factors of increasing the life of the bearing, namely, high temperature and grease quality, and effectively increases the life of the motor bearing, thereby improving the reliability of the motor. Figure 5 The motor life comparison chart shows that the motor life is effectively increased by 8%-12%. Synchronization also saves 2%-5% of grease usage, reducing the cost of the motor.

[0081] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the present invention. The above description is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and variations can be made without departing from the technical principles of the present invention. These improvements and variations should also be regarded as the protection scope of the present invention.

Claims

1. A bearing assembly, characterized in that: include: A motor end cover (1), a first pressure cover (5), a second pressure cover (2), a bearing (3) and an impeller (6), wherein the first pressure cover (5) is arranged at one axial end of the motor end cover (1), and the second pressure cover (2) is arranged at the other axial end of the motor end cover (1); the first pressure cover (5), the motor end cover (1) and the second pressure cover (2) are all located on the outer periphery of the motor shaft (4) and form a bearing chamber (7) with the motor shaft (4); the bearing (3) and the impeller (6) are both arranged in the bearing chamber (7); the impeller (6) is sleeved on the outer periphery of the motor shaft (4) and can rotate integrally with the motor shaft (4); the impeller (6) is located in a first space (8) between the first pressure cover (5) and the bearing (3) so as to block at least part of the oil from being sprayed onto the first pressure cover (5).

2. The bearing assembly according to claim 1, characterized in that: The bearing (3) comprises an inner bearing ring and an outer bearing ring. The inner bearing ring is sleeved on the outer circumference of the motor shaft (4) and can rotate integrally with the motor shaft (4). The outer bearing ring is fixed to the inner circumferential wall of the motor end cover (1). An axial channel (9) is provided between the inner bearing ring and the outer bearing ring. A rolling body (10) is provided in the axial channel (9). The impeller (6) is opposite to the axial channel (9). In the axial projection plane of the motor shaft (4), the impeller (6) completely blocks the axial channel (9) to prevent at least part of the oil from the axial channel (9) from being sprayed onto the inner wall of the first pressure cover (5).

3. The bearing assembly according to claim 2, characterized in that: In the axial direction of the motor shaft (4), the impeller (6) and the bearing (3) have a gap greater than 0, so that the axial channel (9) of the bearing (3) is connected with the first space (8) through the gap, so that lubricating oil can enter the first space (8) through the axial channel (9) and the gap.

4. The bearing assembly according to claim 2, characterized in that: The first gland (5) is provided with a first channel (11), and the motor end cover (1) is provided with a second channel (12); the first channel (11) can introduce oil from the outside of the first gland (5); one end of the second channel (12) is connected to the first channel (11), and the other end of the second channel (12) is connected to the bearing chamber (7) so as to conduct the oil to the bearing chamber (7).

5. The bearing assembly according to claim 4, characterized in that: The second channel (12) extends along the axial direction of the motor shaft (4); a second space (13) is provided between the second gland (2) and the bearing (3); the bearing chamber (7) includes the second space (13); the other end of the second channel (12) is connected to the second space (13) so that lubricating oil can be guided into the second space (13) and enter the axial channel (9) of the bearing (3) through the second space (13).

6. The bearing assembly according to claim 4, characterized in that: It also includes an external heat dissipation pipe (14), one end of which is inserted upward from the lower end of the exterior of the first gland (5) into the interior of the first gland (5) to communicate with the first space (8), and the other end of which is connected to the first channel (11) on the first gland (5) so as to conduct the lubricating oil in the first space (8) to the first channel (11) through the external heat dissipation pipe (14) at its lower end.

7. The bearing assembly according to claim 6, characterized in that: The first channel (11) is located at the upper end of the first gland (5), and the first channel (11) extends along the axial direction of the motor shaft (4). The first gland (5) is also provided with an injection port (15), and the injection port (15) extends downward from the outer upper end of the first gland (5) into the interior of the first gland (5) in a vertical direction until it is connected with the first channel (11), and the other end of the external heat dissipation pipe (14) is connected with the injection port (15) so as to be connected with the first channel (11) through the injection port (15).

8. The bearing assembly according to claim 6 or 7, characterized in that: The oil in the external heat dissipation pipe (14) can also be cooled by the airflow outside the first pressure cover (5), and the oil in the external heat dissipation pipe (14) can also be cooled by the airflow driven by the cooling fan of the motor.

9. The bearing assembly according to any one of claims 1 to 8, characterized in that: The impeller (6) comprises a circular ring and blades, wherein the blades are connected to the outer peripheral wall of the circular ring and protrude outward, and the circular ring is interference-fitted on the outer peripheral wall of the motor shaft (4). There are a plurality of blades, and the plurality of blades are arranged at intervals along the circumference of the circular ring.

10. A motor, characterized in that: A bearing assembly comprising any one of claims 1-9.

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