Motor bearing sealing structure
By setting up a multi-layer sealing structure and oil injection and discharge holes in the motor bearing, the grease pollution problem caused by seal failure in the underground environment of coal mines is solved, ensuring the service life of the grease and the normal operation of the motor.
Patent Information
- Application Number
- CN202421291152.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-07
- Publication Date
- 2024-12-27
- Estimated Expiration
- 2034-06-07
AI Technical Summary
The underground environment of the coal mine is harsh, and the existing sealing structure cannot effectively prevent external water and coal dust from entering the oil chamber, resulting in grease contamination and affecting the bearing life. The grease may overflow or flow into the motor cavity to contaminate the winding, resulting in insulation failure.
The first seal, the second seal and the third seal are provided in the motor bearing, and between the outer small cover and the motor shaft, the inner small cover and the motor shaft, a metal support frame and high-temperature and wear-resistant rubber are used, and a ring metal spring is equipped with a ring and shoulders to ensure the firmness and guidance of the sealing structure, and set oil injection and drain holes on the outer small cover to manage the grease.
Effectively prevent external water and coal dust from entering, prevent grease from spilling or flowing into the motor cavity, protect bearings and windings, extend service life and avoid insulation failure.
Smart Images
Figure CN222254735U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of motor manufacturing, in particular to a sealing structure of a motor shaft. Background Art
[0002] Due to the harsh environment and complex working conditions in coal mines, electrical equipment is exposed to water or immersion, and there is a lot of coal dust and coal powder. Water or coal dust from the outside that enters the oil chamber will destroy the lubricating effect of the grease, affect the service life of the bearing, and even cause bearing damage. In the existing sealing structure, a seal is set at the outer small cover. After the oil seal fails, water or coal dust will enter the oil chamber and contaminate the grease, causing bearing damage. A felt ring oil seal is used at the inner small cover. The felt ring oil seal is made of felt cut into corresponding sizes with large size deviations. It is soaked in gasoline for a certain period of time and formed into a ring. The oil sealing effect is poor, and improper installation of the felt ring oil seal will cause wear on the shaft surface, resulting in seal failure, causing the grease in the oil chamber to enter the inner cavity of the motor and contaminate the winding. Utility Model Content
[0003] In order to solve the above technical problems, the purpose of the utility model is to provide a motor bearing sealing structure, wherein a first seal and a second seal are arranged between the outer small cover and the motor shaft, and a third seal is arranged between the inner small cover and the motor shaft; an oil injection and drain hole is arranged on the outer small cover and is connected to the oil chamber of the outer small cover; the first seal, the second seal and the third seal have the same structure, and all include a metal support frame, the support frame is wrapped with high temperature and wear-resistant rubber, the cross-section of the support frame is a semi-closed rectangle, and an annular metal spring is arranged in the rectangle; a first shaft shoulder is arranged at the second oil seal; a second shaft shoulder is arranged on the right side of the oil seal platform. The purpose of setting the shaft shoulder is to position and prevent the second oil seal and the third oil seal from moving in series;
[0004] In order to ensure the firmness of the rubber and metal support frame being pressed into one, an annular protrusion is added to the outer side of the support frame.
[0005] In order to position the bearing and store grease, a bearing shoulder is arranged on the inner side of the bearing, and the bearing shoulder is more than 3 mm lower than the oil seal platform.
[0006] In order to play a guiding role, chamfers are set on the oil seal shoulder and the oil seal platform.
[0007] The utility model has the advantages that it can prevent three situations from occurring: first, it can prevent external water and coal dust from entering the motor and contaminating the grease; second, it can prevent the grease in the bearing chamber from overflowing out of the motor cavity and contaminating the environment and equipment; third, it can prevent the grease from flowing into the motor cavity and contaminating the motor winding, causing the winding to become damp and the insulation to fail. BRIEF DESCRIPTION OF THE DRAWINGS
[0008] Figure 1 It is a schematic diagram of the structure of the utility model;
[0009] Figure 2 It is a schematic diagram of the structure of the oil seal;
[0010] In the figure, 1. motor shaft, 2. first oil seal, 3. second oil seal, 4. oil filling hole, 5. outer small cover, 6. sealing ring, 7. end cover, 8. retaining ring, 9. bearing, 11. inner small cover, 12. third oil seal, 13. bearing shoulder, 14. second shoulder, 15. first shoulder, 16. oil seal platform, 151. chamfer. DETAILED DESCRIPTION
[0011] The utility model is described in detail below in conjunction with the accompanying drawings. As shown in the figure, in the utility model, 1 is a motor shaft, which is a rotating component, 5 is an outer small cover, on which two sealing grooves are arranged, on which a first oil seal 2 and a second oil seal 3 are placed respectively, their outer diameters are tightly matched with the sealing grooves, and they are relatively stationary with the outer small cover, and the lip is in contact with the motor shaft to form a dynamic seal, and a first shaft shoulder 15 is arranged at the second oil seal 3 to play a role in positioning and preventing the oil seal from moving in series; 11 is an inner small cover, in which a sealing groove is arranged, and a third oil seal 12 is installed here to prevent grease in the oil chamber from entering the interior of the motor, polluting the motor winding, causing the winding to be damp, and causing insulation failure, and a second shaft shoulder 14 is arranged on the right side of the oil seal platform 16 to play a role in positioning and preventing the third oil seal 12 from moving in series.
[0012] The function of the first oil seal 2 is to prevent external water and dust from entering the oil chamber, and the function of the second oil seal 3 is to prevent the grease in the oil chamber from overflowing out of the cavity. At the same time, if the first seal fails, the second seal can still continue to provide protection. In addition, an oil injection and discharge hole 4 is provided on the outer small cover, which is connected to the oil chamber of the outer small cover for injecting new grease and discharging waste grease; the function of the third oil seal 12 is to prevent grease from flowing into the motor cavity, contaminating the motor winding, causing the winding to be damp and causing insulation failure.
[0013] The outer small cover and the inner small cover are both connected to the end cover 7, and the end cover 7 serves to fix the outer ring of the bearing and provide support; the oil chamber side end faces of the outer small cover 5 and the inner small cover 11 are in contact with the end faces on both sides of the outer ring of the bearing to fix the bearing and prevent stringing; 6 is a sealing ring, which serves as a static seal; 9 is a bearing, and the outer side of the bearing is fixed with a retaining ring 8; a bearing shoulder 13 is provided on the inner side of the bearing, which is more than 3 mm lower than the oil seal platform 16, and serves to position the bearing and store grease; a chamfer 151 is added to the bearing shoulder 13 and the oil seal platform 16 to guide the installation of the oil seal.
Claims
1. A motor bearing sealing structure, characterized in that: A first seal and a second seal are arranged between the outer small cover and the motor shaft, and a third seal is arranged between the inner small cover and the motor shaft; an oil injection and discharge hole is arranged on the outer small cover and is communicated with the oil chamber of the outer small cover; the first seal, the second seal and the third seal have the same structure, and all include a metal support frame, the support frame is wrapped with high temperature and wear-resistant rubber, the cross section of the support frame is a semi-closed rectangle, and the annular metal spring is arranged in the rectangle; a first shaft shoulder is arranged at the second oil seal; A second shaft shoulder is arranged on the right side of the oil seal platform.
2. The motor bearing sealing structure according to claim 1, characterized in that: An annular protrusion is added to the outer side of the support frame.
3. The motor bearing sealing structure according to claim 1, characterized in that: A bearing shoulder is arranged inside the bearing, and the bearing shoulder is more than 3 mm lower than the oil seal platform.
4. The motor bearing sealing structure according to claim 1, characterized in that: Chamfers are set on the oil seal shoulder and the oil seal platform.