Motor bearing lubricating oil adding device

Abstract

The utility model provides a motor bearing lubricating oil adding device which is arranged between a motor and a water pump body, a pump connecting seat is arranged on the water pump body, a motor end cover connected with the pump connecting seat is arranged on the motor, and a motor bearing is arranged on a motor shaft of the motor in a sleeved mode and installed on the motor end cover in a penetrating mode. The motor bearing lubricating oil adding device comprises a bearing gland arranged on the motor shaft in a sleeving mode and an oil injection pipe penetrating through a motor end cover, the bearing gland is located below the motor bearing, an oil storage tank located on the periphery of the motor shaft is formed between the bearing gland and the motor bearing, and the inner end of the oil injection pipe is connected to the bearing gland and communicated with the oil storage tank. According to the motor bearing lubricating oil adding device provided by the utility model, the operation of adding lubricating grease to the motor bearing can be carried out only by butting external oil adding equipment with the outer end of the oil filling pipe, and parts such as the motor, the pump connecting seat and the impeller do not need to be disassembled, so that the lubricating maintenance efficiency of the motor bearing is greatly improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of motor bearing lubrication, and in particular relates to a motor bearing lubricating oil adding device. Background Art

[0002] The vertical water pump motor unit is a vertical installation structure with the motor on top and the water pump on the bottom. Its inlet and outlet diameters are the same and located on the same center line. It can be installed in the pipeline like a valve. It has a compact and beautiful appearance and occupies a small area. It is widely used in the mechanical field.

[0003] In actual use, in order to ensure the stable operation of the water pump motor unit, it is necessary to regularly add grease to the bearings in the motor for maintenance. The impeller of the vertical water pump motor unit is directly installed on the extended shaft of the motor. If you want to add lubricating oil to the motor bearing, you need to first remove the motor and use a crane to separate the motor from the water pump, and then remove the impeller, shaft seal, machine-pump connector and other components in turn. The operation is cumbersome and time-consuming, which greatly affects the operation of the water pump system. Utility Model Content

[0004] The embodiment of the utility model provides a motor bearing lubricating oil adding device, which can add lubricating grease to the motor bearing without disassembling the motor, the machine pump connecting seat and the impeller and other components, thereby greatly improving the lubrication and maintenance efficiency of the motor bearing.

[0005] To achieve the above-mentioned purpose, the technical solution adopted by the utility model is: to provide a motor bearing lubricating oil adding device, which is arranged between the motor and the water pump body, and is used to add lubricating oil to the motor bearing, the water pump body is provided with a machine pump connecting seat, the motor is provided with a motor end cover connected to the machine pump connecting seat, the motor bearing is sleeved on the motor shaft of the motor and is installed through the motor end cover, the motor bearing lubricating oil adding device includes a bearing pressure cover sleeved on the motor shaft and an oil filling pipe arranged through the motor end cover, the bearing pressure cover is located below the motor bearing, and an oil storage tank located on the outer periphery of the motor shaft is formed between the bearing pressure cover and the motor bearing, and the inner end of the oil filling pipe is connected to the bearing pressure cover and communicated with the oil storage tank.

[0006] As another embodiment of the utility model, the oil filling pipe includes an extended section, a vertical section and an inner extending section which are connected in sequence. The vertical section is arranged to penetrate the motor end cover in the up and down directions. The extended section is connected to the upper end of the vertical section and gradually extends obliquely outward and upward. The inner extending section is connected to the lower end of the vertical section and extends toward one side of the bearing cover until it is connected to the bearing cover.

[0007] As another embodiment of the utility model, a through hole communicating with the oil storage tank is formed through the outer peripheral wall of the bearing gland, and the inner end of the inner extension section is inserted into the through hole.

[0008] As another embodiment of the utility model, a T-shaped seal is sleeved on the outer periphery of the inner extension section, and the small diameter end of the T-shaped seal is inserted into the straight through hole.

[0009] As another embodiment of the utility model, a flexible section is provided in the middle of the extension section, and both ends of the flexible section are connected to the extension section through an intermediate body respectively.

[0010] As another embodiment of the utility model, the outer end of the extension section is connected to an oil injection piece, which includes a shell threadedly connected to the extension section, a steel ball slidably connected to the shell, and a return spring connected between the shell and the steel ball. The outer end of the shell is provided with an oil filling port, and the return spring is used to elastically push the steel ball to seal the oil filling port. A mounting ring seat with a protruding ring toward one side of the central axis is provided in the shell, and the return spring is arranged between the mounting ring seat and the steel ball.

[0011] As another embodiment of the utility model, a tapered guide groove with a diameter gradually decreasing from the outside to the inside is provided on the outer end surface of the shell, and the oil filling port is penetrated on the groove bottom wall of the tapered guide groove.

[0012] As another embodiment of the utility model, the oil filling port is covered with an elastic filter.

[0013] As another embodiment of the utility model, the outer end of the shell is threadedly connected with a dust cover.

[0014] As another embodiment of the utility model, a sealing ring is connected to the inner periphery of the bearing gland, and a plurality of raised rings for sealing the outer peripheral wall of the motor shaft are arranged on the inner peripheral wall of the sealing ring, and the plurality of raised rings are arranged at intervals along the axial direction of the sealing ring.

[0015] The beneficial effect of the motor bearing lubricating oil adding device provided by the utility model is that: compared with the prior art, the motor bearing lubricating oil adding device of the utility model, by setting the oil filling pipe through the motor end cover and connecting the inner end of the oil filling pipe with the bearing pressure cover, so that the oil filling pipe is connected with the oil storage tank in the bearing pressure cover. When the motor bearing needs to be lubricated, it is only necessary to connect the external refueling equipment with the outer end of the oil filling pipe to fill the lubricating grease into the oil storage tank, and then lubricate the motor bearing above the oil storage tank, without the need to disassemble the motor, the machine pump connecting seat and the impeller and other components, thereby greatly improving the lubrication and maintenance efficiency of the motor bearing. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0017] Figure 1 A schematic diagram of the position structure of the motor bearing lubricating oil adding device provided in the embodiment of the utility model in the water pump motor unit;

[0018] Figure 2 A schematic diagram of the structure of the motor bearing lubricating oil adding device provided by the embodiment of the utility model

[0019] Figure 3 For the utility model embodiment Figure 2 A schematic diagram of the enlarged structure of the middle part A;

[0020] Figure 4 For the utility model embodiment Figure 2 Schematic diagram of the cross-section structure of the middle B part;

[0021] Figure 5 A schematic structural diagram of another embodiment of an extension segment provided in an embodiment of the utility model.

[0022] Among them, the reference numerals in the figure are:

[0023] 1. Bearing gland; 11. Oil storage tank; 12. Straight-through hole; 2. Oil filling pipe; 21. Extension section; 211. Flexible section; 2111. Connecting seat; 212. Intermediate body; 22. Upright section; 23. Inner extension section; 3. T-type seal; 4. Oil filling piece; 41. Housing; 411. Conical guide groove; 412. Oil filling port; 413. Mounting ring seat; 42. Steel ball; 43. Reset spring; 44. Elastic filter; 45. Dust cover; 5. Sealing ring; 51. Raised ring; 10. Motor; 101. Motor end cover; 102. Motor shaft; 1021. Groove; 20. Water pump body; 30. Pump connection seat; 40. Motor bearing; 50. Impeller. DETAILED DESCRIPTION

[0024] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0025] It should be noted that when an element is referred to as being "disposed on" another element, it may be directly on another element or indirectly on another element. It should be understood that the orientation or positional relationship indicated by the terms "length", "width", "upper", "lower", "front", "back", "top", "bottom", "inside", "outside", etc. is based on the orientation or positional relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. The terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meanings of "multiple" and "several" are two or more, unless otherwise clearly and specifically defined.

[0026] Please also read Figure 1 and Figure 5 , the motor bearing lubricating oil adding device provided by the utility model is now described. The motor bearing lubricating oil adding device is arranged between the motor 10 and the water pump body 20, and is used to add lubricating oil to the motor bearing 40. The water pump body 20 is provided with a machine pump connection seat 30, and the motor 10 is provided with a motor end cover 101 connected to the machine pump connection seat 30. The motor bearing 40 is sleeved on the motor shaft 102 of the motor 10 and is installed through the motor end cover 101. The motor bearing lubricating oil adding device includes a bearing pressure cover 1 sleeved on the motor shaft 102 and an oil filling pipe 2 arranged through the motor end cover 101. The bearing pressure cover 1 is located below the motor bearing 40, and an oil storage tank 11 located on the outer periphery of the motor shaft 102 is formed between the bearing pressure cover 1 and the motor bearing 40. The inner end of the oil filling pipe 2 is connected to the bearing pressure cover 1 and communicates with the oil storage tank 11.

[0027] Compared with the prior art, the motor bearing lubricating oil adding device provided in the present embodiment has an oil filling pipe 2 which is arranged on the motor end cover 101 and the inner end of the oil filling pipe 2 is connected to the bearing pressure cover 1 so that the oil filling pipe 2 is connected to the oil storage tank 11 in the bearing pressure cover 1. When the motor bearing 40 needs to be lubricated, it is only necessary to connect the external refueling equipment with the outer end of the oil filling pipe 2 to fill the lubricating grease into the oil storage tank 11, and then lubricate the motor bearing 40 above the oil storage tank 11, without the need to disassemble the motor 10, the machine pump connecting seat 30, the impeller 50 and other components, thereby greatly improving the lubrication and maintenance efficiency of the motor bearing 40.

[0028] In this embodiment, the top surface of the pump coupling seat 30 is connected to the motor end cover 101 by bolts, and the bottom surface is connected to the water pump body 20 by bolts, so that the motor 10 and the water pump body 20 form a vertical water pump motor unit. The motor end cover 101 is provided with a bearing hole, and the motor bearing 40 is placed in the bearing hole. The top surface of the inner ring of the motor bearing 40 is positioned by the shoulder of the motor shaft 102, and the bottom surface of the outer ring of the motor bearing 40 is positioned by the bearing pressure cover 1, which ensures the positioning and installation of the motor bearing 40.

[0029] Specifically, a positioning groove is provided on the bearing gland 1, and the bottom surface of the positioning groove is finely processed to abut against the bottom surface of the outer ring of the motor bearing 40 to position the outer ring of the motor bearing 40. The oil storage tank 11 is opened on the bottom surface of the positioning groove, and is used to store the lubricating grease injected from the oil filling pipe 2 and lubricate the upper motor bearing 40.

[0030] It should be noted that lubricating oil refers to a liquid or semi-solid lubricant used in various mechanical equipment to reduce friction and protect machinery and processed parts. It mainly plays the role of lubrication, cooling, rust prevention, cleaning, sealing and buffering. The lubricating oil in the motor bearing lubricating oil adding device refers to a semi-solid grease for bearing lubrication, such as mechanical butter. When the external refueling equipment applies filling pressure to the oil filling pipe 2, the lubricating grease in the oil storage tank 11 can lubricate the motor bearing 40 located above the oil storage tank 11.

[0031] As a specific implementation of the motor bearing lubricating oil adding device provided by the utility model, see Figure 2 The oil filling pipe 2 includes an extended section 21, a vertical section 22 and an inner section 23 which are connected in sequence. The vertical section 22 is arranged to penetrate the motor end cover 101 along the up and down direction. The extended section 21 is connected to the upper end of the vertical section 22 and gradually extends outward and upward. The inner section 23 is connected to the lower end of the vertical section 22 and extends to one side of the bearing cover 1 until it is connected to the bearing cover 1.

[0032] In this embodiment, a through hole matching the outer diameter of the upright section 22 is provided on the motor end cover 101, and the upright section 22 is inserted into the through hole and welded, so that the upright section 22 is fixed on the motor end cover 101, which does not damage the sealing of the water pump motor unit and facilitates the connection operation of each section of the oil filling pipe 2. The connection between the extended section 21 and the inner extension section 23 and the upright section 22 can be a detachable connection method of threaded connection. Specifically, external threads are respectively provided on the outer peripheral walls of the connecting parts of the extended section 21, the inner extension section 23 and the upright section 22, and are respectively connected through elbows with internal threads. The bending angle of the elbow can be determined according to the installation angle between the extended section 21, the inner extension section 23 and the upright section 22. For example, the elbow between the extended section 21 and the upright section 22 can be a 135° elbow, so that the extended section 21 can be installed tilted outward and upward. The inclined arrangement of the extended section 21 outward and upward can facilitate the connection of the oil filling pipe 2 with the external refueling equipment.

[0033] As a specific implementation of the motor bearing lubricating oil adding device provided by the utility model, see Figure 2 and Figure 3 A through hole 12 communicating with the oil storage tank 11 is formed through the outer peripheral wall of the bearing cover 1 , and the inner end of the inner extension section 23 is inserted into the through hole 12 .

[0034] In this embodiment, the diameter of the through hole 12 matches the outer diameter of the inner extension section 23 to facilitate the insertion of the inner extension section 23. Furthermore, the inner end of the inner extension section 23 is tapered to facilitate the flow of lubricating grease in the through hole 12 to the oil storage tank 11.

[0035] As a specific implementation of the motor bearing lubricating oil adding device provided by the utility model, see Figure 3 A T-shaped seal 3 is sleeved on the outer periphery of the inner extension section 23 , and the small-diameter end of the T-shaped seal 3 is inserted into the straight through hole 12 .

[0036] In this embodiment, a countersunk hole with a diameter larger than the inner diameter of the straight hole 12 is provided on the outer peripheral wall of the bearing cover 1, and the countersunk hole is connected to the straight hole 12. The T-type seal 3 is first sleeved on the outer periphery of the inner extension section 23. After the inner end of the inner extension section 23 is inserted into the straight hole 12, the T-type seal 3 is pushed toward the straight hole 12 until the small diameter end of the T-type seal 3 is inserted into the countersunk hole.

[0037] Specifically, the T-shaped seal 3 is made of rubber material and has good resilience, so that the T-shaped seal 3 is in an elastic abutment state with the inner extension section 23 and the countersunk hole, so that a good seal is formed between the inner extension section 23 and the straight through hole 12 to prevent lubricating grease from leaking into the machine pump connecting seat 30.

[0038] As a specific implementation of the motor bearing lubricating oil adding device provided by the utility model, see Figure 5 A flexible section 211 is provided in the middle of the extension section 21 , and both ends of the flexible section 211 are connected to the extension section 21 through an intermediate body 212 .

[0039] In this embodiment, the extension section 21 is divided into two parts from the middle of the extension section 21, and the flexible section 211 is connected to the two parts through two intermediate bodies 212 to improve the spatial adaptability of the extension section 21. The flexible section 211 is a hose structure with connecting seats 2111 at both ends. The hose can be a steel hose to ensure the pressure bearing capacity of the flexible section 211. The connecting seat 2111 is provided with an internal thread, and the intermediate body 212 is provided with a corresponding external thread. The extension section 21 and the intermediate body 212 can be welded as a whole or detachably connected in the form of a threaded connection. By connecting a flexible section 211 in the middle of the extension section 21, it is easy to connect the oil filling pipe 2 with the external refueling equipment in a narrow space, so that the oil filling pipe 2 has good applicability.

[0040] As a specific implementation of the motor bearing lubricating oil adding device provided by the utility model, see Figure 2 and Figure 4 The outer end of the extension section 21 is connected to an oil injection piece 4, which includes a shell 41 threadedly connected to the extension section 21, a steel ball 42 slidably connected to the shell 41, and a return spring 43 connected between the shell 41 and the steel ball 42. An oil injection port 412 is provided at the outer end of the shell 41. The return spring 43 is used to elastically push the steel ball 42 to block the oil injection port 412. A mounting ring seat 413 protruding toward one side of the central axis is provided in the shell 41, and the return spring 43 is arranged between the mounting ring seat 413 and the steel ball 42.

[0041] In this embodiment, the external refueling device is a commonly used grease gun, which has a pointed nozzle that docks with the oil filling piece 4. When filling oil, the steel ball 42 is pushed into the inside of the oil filling piece 4 by the pointed nozzle on the grease gun, and its pushing force is greater than the pushing force of the return spring 43 on the steel ball 42, so that the oil filling port 412 can be opened, and then the grease gun is operated to fill the lubricating grease into the oil filling pipe 2 through the oil filling piece 4; after the oil filling is completed, the grease gun is removed, and the steel ball 42 loses the pushing effect of the pointed nozzle and slides outwards to block the oil filling port 412 under the pushing effect of the return spring 43, preventing the lubricating grease in the oil filling pipe 2 from overflowing.

[0042] As a specific implementation of the motor bearing lubricating oil adding device provided by the utility model, see Figure 4 A conical guide groove 411 whose diameter gradually decreases from the outside to the inside is provided on the outer end surface of the shell 41 , and the oil filling port 412 is located on the bottom wall of the conical guide groove 411 .

[0043] In this embodiment, in actual application, when the tip of the grease gun butts against the steel ball 42 on the oil injection piece 4, it is easy to slip, resulting in an unreliable butt joint. In view of this, a tapered guide groove 411 is provided on the outer end surface of the housing 41, and the oil injection port 412 is moved inwardly to the groove bottom wall of the tapered guide groove 411. When injecting oil, the tip of the grease gun is butt-jointed in the tapered guide groove 411 and then a thrust force is applied to the steel ball 42. Due to the guiding effect of the tapered guide groove 411, the butt joint between the grease gun and the oil injection piece 4 is more stable and easy to operate.

[0044] As a specific implementation of the motor bearing lubricating oil adding device provided by the utility model, see Figure 4 The oil filling port 412 is covered with an elastic filter screen 44 .

[0045] In this embodiment, the elastic filter 44 can elastically bulge outward and fit on the surface of the steel ball 42 when the steel ball 42 blocks the oil filling port 412, and can also elastically concave inward as the grease gun tip pushes when the oil filling piece 4 is connected to the grease gun. The elastic filter 44 can not only filter impurities in the lubricating grease during oil filling, but also because the material of the elastic filter 44 is much rougher than the surface of the steel ball 42, the elastic filter 44 can also increase the friction between the grease gun tip and the steel ball 42, which helps to increase the stability of the connection process between the grease gun and the oil filling piece 4.

[0046] As a specific implementation of the motor bearing lubricating oil adding device provided by the utility model, see Figure 4 The outer end of the housing 41 is threadedly connected with a dust cover 45 .

[0047] In this embodiment, after the oil filling is completed, the dust cover 45 is rotated until the dust cover 45 is connected to the outer end of the shell 41 to block the conical guide groove 411 on the oil filling piece 4 to prevent foreign matter such as dust from entering the oil filling piece 4 to block the oil filling port 412.

[0048] As a specific implementation of the motor bearing lubricating oil adding device provided by the utility model, see Figure 2 and Figure 3 The inner circumference of the bearing gland 1 is connected with a sealing ring 5 , and the inner circumferential wall of the sealing ring 5 is provided with a plurality of raised rings 51 for sealing the outer circumferential wall of the motor shaft 102 , and the plurality of raised rings 51 are arranged at intervals along the axial direction of the sealing ring 5 .

[0049] Due to the vertical installation of the water pump motor unit, the lubricating grease in the oil storage tank 11 is easy to overflow downward along the connection gap between the bearing gland 1 and the motor shaft 102 under the action of gravity to form leakage. In addition, the water pump motor unit will vibrate during operation, which further promotes the occurrence of the above leakage phenomenon. The leaked lubricating grease adheres to the pump connection seat 30 and is difficult to clean, resulting in a waste of lubricating grease.

[0050] In this embodiment, an installation groove is provided on the inner wall of the bearing cover 1, and the sealing ring 5 is pushed into the installation groove. After the motor shaft 102 and the bearing cover 1 are installed, the raised ring 51 on the sealing ring 5 can be pressed against the outer peripheral wall of the motor shaft 102, thereby increasing the sealing between the bearing cover 1 and the motor shaft 102.

[0051] Furthermore, a plurality of axially arranged grooves 1021 are provided on the outer peripheral wall of the motor shaft 102, and a plurality of raised rings 51 are respectively clamped in the corresponding grooves 1021, so that a labyrinth-type sealing structure is formed between the bearing cover 1 and the motor shaft 102, thereby improving the sealing effect of the sealing ring 5 and effectively preventing the occurrence of the above-mentioned leakage phenomenon. At the same time, the provision of the sealing ring 5 also prevents the liquid in the water pump body 20 from entering the oil storage tank 11 upward along the motor shaft 102, causing erosion to the motor bearing 40 and reducing the service life of the motor bearing 40.

[0052] Specifically, the number of grooves 1021 on the motor shaft 102 is greater than the number of raised rings 51 on the sealing ring 5 to compensate for the axial error formed during the installation process and ensure that the raised rings 51 on the sealing ring 5 can be correspondingly engaged in the grooves 1021 to ensure the sealing effect of the sealing ring 5.

[0053] 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 principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A motor bearing lubricating oil adding device is arranged between the motor and the water pump body, and is used to add lubricating oil to the motor bearing. The water pump body is provided with a motor pump connecting seat, and the motor is provided with a motor end cover connected to the motor pump connecting seat. The motor bearing is sleeved on the motor shaft of the motor and is installed through the motor end cover, and is characterized in that: It includes a bearing cover sleeved on the motor shaft and an oil filling pipe penetrating the motor end cover. The bearing cover is located below the motor bearing and forms an oil storage tank located on the outer periphery of the motor shaft between the bearing cover and the motor bearing. The inner end of the oil filling pipe is connected to the bearing cover and communicated with the oil storage tank.

2. The motor bearing lubricating oil adding device according to claim 1, characterized in that: The oil filling pipe includes an extended section, a vertical section and an inner extending section which are connected in sequence. The vertical section is arranged to penetrate the motor end cover in the up and down directions. The extended section is connected to the upper end of the vertical section and gradually extends outward and upward. The inner extending section is connected to the lower end of the vertical section and extends to one side of the bearing cover until it is connected to the bearing cover.

3. The motor bearing lubricating oil adding device according to claim 2, characterized in that: A through hole communicating with the oil storage tank is formed through the outer peripheral wall of the bearing gland, and the inner end of the inner extension section is inserted into the through hole.

4. The motor bearing lubricating oil adding device according to claim 3, characterized in that: A T-shaped seal is sleeved on the outer periphery of the inner extension section, and the small-diameter end of the T-shaped seal is inserted into the straight-through hole.

5. The motor bearing lubricating oil adding device according to claim 2, characterized in that: A flexible section is provided in the middle of the extension section, and both ends of the flexible section are connected to the extension section through an intermediate body.

6. The motor bearing lubricating oil adding device according to claim 2, characterized in that: The outer end of the extension section is connected to an oil injection piece, and the oil injection piece includes a shell threadedly connected to the extension section, a steel ball slidably connected to the shell, and a return spring connected between the shell and the steel ball. The outer end of the shell is provided with an oil injection port, and the return spring is used to elastically push the steel ball to block the oil injection port. A mounting ring seat with a protruding ring toward one side of the central axis is provided in the shell, and the return spring is arranged between the mounting ring seat and the steel ball.

7. The motor bearing lubricating oil adding device according to claim 6, characterized in that: The outer end surface of the shell is provided with a tapered guide groove whose diameter gradually decreases from the outside to the inside, and the oil filling port is arranged through the bottom wall of the tapered guide groove.

8. The motor bearing lubricating oil adding device according to claim 7, characterized in that: The oil filling port is covered with an elastic filter screen.

9. The motor bearing lubricating oil adding device according to claim 6, characterized in that: The outer end of the shell is threadedly connected with a dust cover.

10. The motor bearing lubricating oil adding device according to any one of claims 1 to 9, characterized in that: The inner circumference of the bearing gland is connected with a sealing ring, and the inner circumferential wall of the sealing ring is provided with a plurality of raised rings for sealing the outer circumferential wall of the motor shaft, and the plurality of raised rings are arranged at intervals along the axial direction of the sealing ring.

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