CN-224201118-U - Multidirectional combined type dynamic seal assembly used in permanent magnet semi-direct drive device

Abstract

The utility model provides a multidirectional compound dynamic seal assembly used in a permanent magnet semi-direct drive device, which comprises an inner tooth shaft sleeve and an oil slinger, wherein a lower mounting hole is formed in the lower end of the inner tooth shaft sleeve, the lower end of the inner tooth shaft sleeve is sleeved on an output shaft of a motor through the lower mounting hole, an upper mounting hole is formed in the upper end of the inner tooth shaft sleeve, an inner gear is arranged on the inner wall of the upper mounting hole and meshed with a sun gear of a speed reducer, the oil slinger is arranged at the upper end of the inner tooth shaft sleeve, the oil slinger and the inner tooth shaft sleeve synchronously rotate, a bottom plate is located below the oil slinger, and an oil drain hole is formed in a box body. Under the centrifugal force effect that the oil slinger rotated and produced, the lubricating oil from the sun gear is thrown all around, and the skeleton oil blanket only is used for blocking oil mist and a small amount of lubricating oil that splashes, prolongs the life of skeleton oil blanket, has promoted seal assembly's reliability, reduces equipment overall maintenance cost.

Inventors

• MA XIAOLU
• LI XIAOJIANG
• LIU WENYUAN
• ZHANG YAYU

Assignees

• 北京电力设备总厂有限公司

Dates

Publication Date

20260505

Application Date

20250530

Claims (10)

1. 1. The multidirectional combined type dynamic seal assembly for the permanent magnet semi-direct drive device comprises a speed reducer and a motor, wherein the speed reducer comprises a box body and a bottom plate, the bottom plate is connected with the lower end of the box body, the multidirectional combined type dynamic seal assembly is characterized in that the seal assembly comprises an internal tooth shaft sleeve and an oil slinger, wherein, The lower end of the internal tooth shaft sleeve is provided with a lower installation hole, the lower end of the internal tooth shaft sleeve is sleeved on the output shaft of the motor through the lower installation hole, and the internal tooth shaft sleeve and the output shaft of the motor synchronously rotate; an upper mounting hole is formed in the upper end of the inner tooth shaft sleeve, an inner gear is arranged on the inner wall of the upper mounting hole, and the inner gear is meshed with a sun gear of the speed reducer; The oil slinger is arranged at the upper end of the internal gear sleeve, the oil slinger and the internal gear sleeve synchronously rotate, the bottom plate is positioned below the oil slinger, and the box body is provided with an oil drain hole.
2. 2. The multi-directional compound dynamic seal assembly for a permanent magnet semi-direct drive apparatus of claim 1, wherein, The center department of bottom plate is provided with the oil blanket seat, install the skeleton oil blanket in the oil blanket seat, the skeleton oil blanket can be right the internal tooth axle sleeve with the junction of bottom plate seals.
3. 3. The multi-directional compound dynamic seal assembly for a permanent magnet semi-direct drive apparatus of claim 1, wherein, The bottom plate is of a conical structure, and the position of the center of the bottom plate is higher than the position of the edge of the bottom plate.
4. 4. The multi-directional compound dynamic seal assembly for a permanent magnet semi-direct drive apparatus of claim 2, wherein, The oil drain hole is positioned at the bottom of the box body, and the position of the oil seal seat is higher than the position of the oil drain hole.
5. 5. The multi-directional compound dynamic seal assembly for a permanent magnet semi-direct drive apparatus of claim 2, wherein, And the lip of the framework oil seal and the outer wall of the inner tooth shaft sleeve form contact type dynamic seal.
6. 6. The multi-directional compound dynamic seal assembly for a permanent magnet semi-direct drive apparatus of claim 1, wherein, The internal tooth shaft sleeve is in interference fit with an output shaft of the motor.
7. 7. The multi-directional compound dynamic seal assembly for a permanent magnet semi-direct drive apparatus of claim 2, wherein, The oil slinger comprises a mounting portion, a connecting portion and a body, wherein the mounting portion, the connecting portion and the body are of an integral structure, the cross section of the mounting portion is annular, the cross section of the body is annular, the connecting portion is of a barrel-shaped structure, the upper end of the connecting portion is connected with the outer wall of the mounting portion, and the lower end of the connecting portion is connected with the inner wall of the body.
8. 8. The multi-directional compound dynamic seal assembly for a permanent magnet semi-direct drive apparatus of claim 7, wherein, The axis of the connecting part is collinear with the axis of the internal tooth shaft sleeve, the connecting part is sleeved on the internal tooth shaft sleeve through clearance fit, the mounting part covers the upper end of the internal tooth shaft sleeve, and the mounting part is connected with the upper end of the internal tooth shaft sleeve through a bolt; The cross section of the body is perpendicular to the axis of the internal tooth shaft sleeve.
9. 9. The multi-directional compound dynamic seal assembly for a permanent magnet semi-direct drive apparatus of claim 7, wherein, The external diameter of body is greater than the external diameter of oil blanket seat and is less than the internal diameter of box.
10. 10. The multi-directional compound dynamic seal assembly for a permanent magnet semi-direct drive apparatus of claim 7, wherein, An annular groove is formed in the outer wall of the inner tooth shaft sleeve, which is located at the inner side of the body, and a sealing ring is arranged in the annular groove.

Description

Multidirectional combined type dynamic seal assembly used in permanent magnet semi-direct drive device Technical Field The utility model relates to the technical field of mechanical transmission, in particular to a multidirectional composite dynamic seal assembly used in a permanent magnet semi-direct drive device. Background Compared with the traditional three-phase asynchronous motor and vertical heavy-load speed reducer combined use mode, the permanent magnet semi-direct drive gear motor adopted by the medium speed coal mill has the remarkable advantages of small occupied space, high transmission efficiency, low comprehensive energy consumption and the like. The upper half part of the permanent magnet half direct drive gear motor is a single-stage planetary reducer, oil lubrication is adopted, the lower half part of the permanent magnet half direct drive gear motor is a permanent magnet synchronous motor, serious faults can be caused by abnormal invasion of a fluid medium, and therefore whether a sealing structure at the joint of the reducer and the motor is reliable or not becomes a key point of the use safety of the whole equipment. The sealing structure in the prior art is characterized in that a shaft sleeve is arranged on a motor shaft, a framework oil seal is arranged at the bottom of an oil pool of a speed reducer, the framework oil seal is arranged in an oil seal groove in the center of a bottom plate of a box body, and a lip of the framework oil seal and the outer diameter of the shaft sleeve form contact type dynamic seal. Because the service life of the skeleton oil seal is about 2-3 years in the state of the power frequency operation of the permanent magnet semi-direct drive gear motor, and the whole expected maintenance period of the equipment is 8-10 years, the contradiction that the service life of the sealing element is smaller than the expected maintenance period of the equipment is generated. In addition, the application condition of the skeleton oil seal has strict requirements on the machining precision of the installation position and the radial runout of the rotating piece (shaft sleeve), and the working condition of frequent vibration of the medium-speed mill is unfavorable for the skeleton oil seal to obtain an ideal working environment, so that the risk of early damage of the sealing structure is increased. Disclosure of utility model The utility model aims to provide a multidirectional compound dynamic seal assembly for a permanent magnet semi-direct drive device, which can improve the sealing reliability in a permanent magnet semi-direct drive gear motor, prolong the service life of a framework oil seal and reduce the overall maintenance cost of equipment. In order to achieve the above object, the present utility model provides the following technical solutions: The multi-directional combined type dynamic sealing assembly used in the permanent magnet semi-direct driving device comprises a speed reducer and a motor, the speed reducer comprises a box body and a bottom plate, the bottom plate is connected with the lower end of the box body, the sealing assembly comprises an inner tooth shaft sleeve and an oil slinger, a lower mounting hole is formed in the lower end of the inner tooth shaft sleeve, the lower end of the inner tooth shaft sleeve is sleeved on an output shaft of the motor through the lower mounting hole, the inner tooth shaft sleeve and the output shaft of the motor synchronously rotate, an upper mounting hole is formed in the upper end of the inner tooth shaft sleeve, an inner gear is arranged on the inner wall of the upper mounting hole and is meshed with a sun gear of the speed reducer, the oil slinger is arranged at the upper end of the inner tooth shaft sleeve, the oil slinger and the inner tooth shaft sleeve synchronously rotate, and the bottom plate is located below the oil slinger, and an oil drain hole is formed in the box body. Further, in the multidirectional combined type dynamic seal assembly for the permanent magnet semi-direct drive device, an oil seal seat is arranged at the center of the bottom plate, a framework oil seal is arranged in the oil seal seat, and the framework oil seal can seal the joint of the inner tooth shaft sleeve and the bottom plate. Further, in the multi-directional composite dynamic seal assembly for the permanent magnet semi-direct drive device, the bottom plate is of a conical structure, and the center of the bottom plate is higher than the edge of the bottom plate. Further, in the multi-directional combined type dynamic seal assembly for the permanent magnet semi-direct drive device, the oil drain hole is located at the bottom of the box body, and the oil seal seat is located at a position higher than the oil drain hole. Further, in the multi-directional composite dynamic seal assembly for the permanent magnet semi-direct drive device, the lip of the skeleton oil seal and the outer wall of the inner tooth shaft sleeve form co