Multidirectional combined type dynamic sealing assembly used in permanent magnet semi-direct drive device

Abstract

The utility model provides a multidirectional combined type dynamic seal assembly used in a permanent magnet semi-direct drive device, which comprises an inner gear shaft sleeve and an oil slinger, the lower end of the inner gear shaft sleeve is provided with a lower mounting hole, and the lower end of the inner gear 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 gear 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 inner gear shaft sleeve, the oil slinger and the inner gear shaft sleeve rotate synchronously, the bottom plate is located below the oil slinger, and an oil discharge hole is formed in the box body. Under the action of centrifugal force generated by rotation of the oil slinger, lubricating oil from the sun gear is thrown to the periphery, the framework oil seal is only used for blocking oil mist and a small amount of splashing lubricating oil, the service life of the framework oil seal is prolonged, the reliability of a sealing assembly is improved, and the overall maintenance cost of equipment is reduced.

Description

Technical Field

[0001] This utility model relates to the field of mechanical transmission technology, and in particular to a multi-directional composite dynamic sealing assembly for use in a permanent magnet semi-direct drive device. Background Technology

[0002] Compared to the traditional combination of a three-phase asynchronous motor and a vertical heavy-duty reducer, the permanent magnet semi-direct drive gear motor used in medium-speed coal mills has significant advantages, including smaller footprint, higher transmission efficiency, and lower overall energy consumption. The upper part of the permanent magnet semi-direct drive gear motor is a single-stage planetary reducer with oil lubrication; the lower part is a permanent magnet synchronous motor. Abnormal intrusion of fluid media can cause serious malfunctions; therefore, the reliability of the sealing structure at the connection between the reducer and the motor is crucial to the safe operation of the entire equipment.

[0003] The existing sealing structure involves mounting a bushing on the motor shaft, placing a skeleton oil seal at the bottom of the gearbox oil sump, and installing the skeleton oil seal in an oil seal groove in the center of the housing base plate. The lip of the skeleton oil seal forms a contact dynamic seal with the outer diameter of the bushing. Because the lifespan of the skeleton oil seal is approximately 2-3 years under the operating frequency conditions of a permanent magnet semi-direct drive gear motor, while the overall expected maintenance cycle of the equipment is 8-10 years, a contradiction arises where the lifespan of the seal is shorter than the expected maintenance cycle of the equipment. Furthermore, the application conditions of the skeleton oil seal place strict requirements on the machining accuracy of the installation position and the radial runout of the rotating parts (shoulder sleeve). The frequent vibrations of medium-speed mills are not conducive to achieving an ideal working environment for the skeleton oil seal, which also increases the risk of premature damage to the sealing structure. Utility Model Content

[0004] The purpose of this invention is to provide a multi-directional composite dynamic sealing assembly for use in permanent magnet semi-direct drive devices. This sealing assembly can improve the reliability of sealing in permanent magnet semi-direct drive gear motors, extend the service life of skeleton oil seals, and reduce the overall maintenance cost of equipment.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A multi-directional composite dynamic sealing assembly for a permanent magnet semi-direct drive device is disclosed. The permanent magnet semi-direct drive device includes a reducer and a motor. The reducer includes a housing and a base plate, with the base plate connected to the lower end of the housing. The sealing assembly includes an internal gear bushing and an oil slinger ring. The lower end of the internal gear bushing has a lower mounting hole, through which it is fitted onto the output shaft of the motor. The internal gear bushing rotates synchronously with the output shaft of the motor. The upper end of the internal gear bushing has an upper mounting hole, on which an internal gear is mounted. The internal gear meshes with the sun gear of the reducer. The oil slinger ring is located at the upper end of the internal gear bushing and rotates synchronously with it. The base plate is located below the oil slinger ring, and the housing has an oil drain hole.

[0007] Furthermore, in the aforementioned multi-directional composite dynamic sealing assembly for a permanent magnet semi-direct drive device, an oil seal seat is provided at the center of the base plate, and a skeleton oil seal is installed inside the oil seal seat. The skeleton oil seal can seal the connection between the internal gear bushing and the base plate.

[0008] Furthermore, in the aforementioned multi-directional composite dynamic sealing assembly for a permanent magnet semi-direct drive device, the base plate has a conical structure, and the center of the base plate is located higher than the edge of the base plate.

[0009] Furthermore, in the aforementioned multi-directional composite dynamic sealing assembly for a permanent magnet semi-direct drive device, the oil drain hole is located at the bottom of the housing, and the oil seal seat is located at a position higher than the oil drain hole.

[0010] Furthermore, in the aforementioned multi-directional composite dynamic seal assembly for a permanent magnet semi-direct drive device, the lip of the skeleton oil seal forms a contact dynamic seal with the outer wall of the internal gear bushing.

[0011] Furthermore, in the aforementioned multi-directional composite dynamic seal assembly for a permanent magnet semi-direct drive device, the internal gear bushing and the output shaft of the motor are interference-fitted.

[0012] Furthermore, in the aforementioned multi-directional composite dynamic sealing assembly for a permanent magnet semi-direct drive device, the oil slinger ring includes a mounting portion, a connecting portion, and a body. The mounting portion, the connecting portion, and the body are an integral structure. The cross-section of the mounting portion is annular, the cross-section of the body is annular, and the connecting portion is a barrel-shaped structure. The upper end of the connecting portion is connected to the outer wall of the mounting portion, and the lower end of the connecting portion is connected to the inner wall of the body.

[0013] Furthermore, in the aforementioned multi-directional composite dynamic seal assembly for a permanent magnet semi-direct drive device, the axis of the connecting part is collinear with the axis of the internal gear sleeve, the connecting part is fitted onto the internal gear sleeve with a clearance fit, the mounting part covers the upper end of the internal gear sleeve, and the mounting part and the upper end of the internal gear sleeve are connected by bolts; the cross-section of the body is perpendicular to the axis of the internal gear sleeve.

[0014] Furthermore, in the aforementioned multi-directional composite dynamic sealing assembly for a permanent magnet semi-direct drive device, the outer diameter of the body is larger than the outer diameter of the oil seal seat and smaller than the inner diameter of the housing.

[0015] Furthermore, in the aforementioned multi-directional composite dynamic sealing assembly for a permanent magnet semi-direct drive device, an annular groove is provided on the outer wall of the internal gear bushing located inside the body, and a sealing ring is provided in the annular groove.

[0016] Analysis reveals that this utility model discloses a multi-directional composite dynamic sealing assembly for a permanent magnet semi-direct drive device. The oil slinger ring of this sealing assembly completely shields the skeleton oil seal, causing the lubricating oil from the sun gear to be thrown outwards by the centrifugal force generated by the rotation of the oil slinger ring. Simultaneously, the sealing ring blocks any potential leakage of small amounts of lubricating oil, preventing lubricating oil from entering the skeleton oil seal from above. This extends the service life of the skeleton oil seal, improves the reliability of the sealing assembly, and reduces the overall maintenance cost of the equipment. This sealing assembly utilizes the centrifugal force and gravity generated by the rotation of the oil slinger ring to discharge the lubricating oil from the reducer through the drain hole. The skeleton oil seal only serves to block oil mist and a small amount of splashed lubricating oil, reducing the impact of the unstable lifespan of the skeleton oil seal under complex operating conditions on the overall quality of the equipment. Attached Figure Description

[0017] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation of the present invention. Wherein:

[0018] Figure 1 This is a structural schematic diagram of an embodiment of the present utility model.

[0019] Figure 2 This is a three-dimensional structural diagram of an embodiment of the present utility model.

[0020] Figure 3 This is a cross-sectional three-dimensional structural diagram of an embodiment of the present invention.

[0021] Figure 4 This is a three-dimensional structural diagram of an oil-slinging ring according to an embodiment of the present invention.

[0022] Explanation of reference numerals in the attached drawings: 1 Sun gear; 2 Oil slinger ring; 3 Base plate; 4 Bolt; 5 Internal gear bushing; 6 Sealing ring; 7 Oil seal seat; 8 Skeleton oil seal; 9 Output shaft; 10 Oil drain hole; 11 Housing; 12 Mounting part; 13 Connecting part; 14 Body. Detailed Implementation

[0023] The present invention will now be described in detail with reference to the accompanying drawings and embodiments. Various examples are provided by way of explanation of the present invention and not by way of limitation. In fact, those skilled in the art will recognize that modifications and variations can be made to the present invention without departing from the scope or spirit of the invention. For example, a feature shown or described as part of one embodiment may be used in another embodiment to produce yet another embodiment. Therefore, it is desirable that the present invention encompass such modifications and variations that fall within the scope of the appended claims and their equivalents.

[0024] In the description of this utility model, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," and "bottom," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and do not require that this utility model be constructed and operated in a specific orientation; therefore, they should not be construed as limitations on this utility model. The terms "connected," "linked," and "set up" used in this utility model should be interpreted broadly. For example, they can refer to a fixed connection or a detachable connection; a direct connection or an indirect connection through intermediate components; a wired connection, a radio connection, or a wireless communication signal connection. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances.

[0025] The accompanying drawings illustrate one or more examples of the present invention. The detailed description uses numerals and letters to refer to features in the drawings. Similar or analogous reference numerals in the drawings and description have been used to refer to similar or analogous parts of the present invention. As used herein, the terms “first,” “second,” and “third,” etc., are used interchangeably to distinguish one component from another and are not intended to indicate the location or importance of individual components.

[0026] like Figures 1 to 4 As shown, according to an embodiment of this utility model, a multi-directional composite dynamic sealing assembly (multi-directional refers to the radial and axial directions of the internal gear bushing 5) is provided for use in a permanent magnet semi-direct drive device. The permanent magnet semi-direct drive device (i.e., a permanent magnet semi-direct drive gear motor) includes a reducer and a motor. The lower end of the reducer is connected to the upper end of the motor. This sealing assembly is used to seal the connection between the reducer and the motor. The reducer includes a housing 11 and a base plate 3. The base plate 3 is connected to the lower end of the housing 11. Figure 1 and Figure 2 As shown, the sealing assembly includes an internal gear sleeve 5 and an oil slinger ring 2. The internal gear sleeve 5 passes through the base plate 3, and its lower end is located inside the motor. The lower end of the internal gear sleeve 5 is provided with a lower mounting hole, the axis of which is collinear with the axis of the internal gear sleeve 5. The lower end of the internal gear sleeve 5 is sleeved on the output shaft 9 of the motor through the lower mounting hole, and the internal gear sleeve 5 rotates synchronously with the output shaft 9 of the motor. The upper end of the internal gear sleeve 5 is located inside the reducer, and its upper end is provided with an upper mounting hole, the axis of which is collinear with the axis of the internal gear sleeve 5. An internal gear is provided on the inner wall of the upper mounting hole, and the internal gear meshes with the sun gear 1 of the reducer to transmit torque. The oil slinger ring 2 is located at the upper end of the internal gear sleeve 5 and rotates synchronously with the internal gear sleeve 5. The base plate 3 is located below the oil slinger ring 2, and the housing 11 is provided with an oil drain hole 10. During the operation of the permanent magnet semi-direct drive gear motor, the lubricating oil from the direction of the sun gear 1 is thrown to all sides by the centrifugal force generated by the rotation of the oil slinger ring 2, and the lubricating oil thrown to all sides of the oil slinger ring 2 is discharged through the oil drain hole 10.

[0027] Furthermore, an oil seal seat 7 is provided at the center of the base plate 3, and a skeleton oil seal 8 is installed inside the oil seal seat 7. The skeleton oil seal 8 can seal the connection between the internal gear bushing 5 and the base plate 3.

[0028] Furthermore, the base plate 3 has a conical structure, with its center position higher than its edge position. The lubricating oil falling from various parts inside the reducer flows along the inner wall of the reducer housing 11 and the conical surface of the base plate 3 to the surrounding area, and together with the lubricating oil thrown outward by the oil slinger ring 2, forms an oil pool. The lubricating oil in the oil pool is discharged through the oil drain hole 10.

[0029] Furthermore, the oil drain hole 10 is located at the bottom of the housing 11. The lubricating oil falling into the bottom of the housing 11 of the reducer flows to the oil drain hole 10 under the action of gravity. The position of the oil seal seat 7 is higher than the position of the oil drain hole 10, so that the plane on which the skeleton oil seal 8 is located is always higher than the liquid level of the lubricating oil on the base plate 3, ensuring that the lubricating oil on the base plate 3 cannot enter the interior of the skeleton oil seal 8.

[0030] Furthermore, the lip of the skeleton oil seal 8 forms a contact dynamic seal with the outer wall of the internal gear sleeve 5. The skeleton oil seal 8 can block the oil mist and a small amount of splashed lubricating oil formed in the reducer, ensuring the sealing effect of the sealing assembly.

[0031] Furthermore, the internal gear sleeve 5 and the output shaft 9 of the motor are interference fit.

[0032] Furthermore, such as Figure 4As shown, the oil slinger ring 2 includes a mounting part 12, a connecting part 13, and a body 14. The mounting part 12, the connecting part 13, and the body 14 are an integral structure. The cross-section of the mounting part 12 is annular, the cross-section of the body 14 is annular, and the connecting part 13 is a barrel-shaped structure. The upper end of the connecting part 13 is connected to the outer wall of the mounting part 12, and the lower end of the connecting part 13 is connected to the inner wall of the body 14.

[0033] Furthermore, the axis of the connecting part 13 is collinear with the axis of the internal gear sleeve 5. The connecting part 13 is fitted onto the internal gear sleeve 5 with a clearance fit. The mounting part 12 covers the upper end of the internal gear sleeve 5. The mounting part 12 and the upper end of the internal gear sleeve 5 are connected by bolts 4. The cross-section of the body 14 is perpendicular to the axis of the internal gear sleeve 5.

[0034] Furthermore, the outer diameter of the body 14 is larger than the outer diameter of the oil seal seat 7 and smaller than the inner diameter of the housing 11, ensuring that the oil slinger ring 2 can completely cover the skeleton oil seal 8.

[0035] Furthermore, such as Figure 3 As shown, an annular groove is provided on the outer wall of the internal gear sleeve 5 located inside the body 14, and a sealing ring 6 is provided in the annular groove. The sealing ring 6 forms a static seal in the mating surface between the internal gear sleeve 5 and the oil slinger ring 2. The sealing ring 6 can block the small amount of lubricating oil that leaks between the internal gear sleeve 5 and the oil slinger ring 2.

[0036] As can be seen from the above description, the embodiments of this utility model achieve the following technical effects:

[0037] 1. The oil slinger ring 2 completely covers the skeleton oil seal 8, so that the lubricating oil from the sun gear 1 is thrown to the surroundings by the centrifugal force generated by the rotation of the oil slinger ring 2. At the same time, the sealing ring 6 blocks the possible leakage of a small amount of lubricating oil, so that the lubricating oil from above the skeleton oil seal 8 will not enter the interior of the skeleton oil seal 8 at all, thus extending the service life of the skeleton oil seal 8, improving the reliability of the sealing assembly, and reducing the overall maintenance cost of the equipment.

[0038] 2. The position of the oil seal seat 7 is higher than that of the oil drain hole 10. All the lubricating oil falling into the bottom of the gearbox 11 of the reducer flows to the oil drain hole 10 under the action of gravity, so that the lubricating oil cannot enter the interior of the skeleton oil seal 8.

[0039] 3. The sealing assembly uses the centrifugal force and gravity generated by the rotation of the oil slinger ring 2 to discharge the lubricating oil in the reducer through the oil drain hole 10. The skeleton oil seal 8 is only used to block oil mist and a small amount of splashed lubricating oil, which reduces the impact of the unstable life of the skeleton oil seal 8 under complex working conditions on the overall quality of the equipment.

[0040] The above description is merely a preferred embodiment of this utility model and is not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A multi-directional composite dynamic sealing assembly for use in a permanent magnet semi-direct drive device, the permanent magnet semi-direct drive device comprising a reducer and a motor, the reducer comprising a housing and a base plate, the base plate being connected to the lower end of the housing, characterized in that, The sealing assembly includes an internal gear bushing and an oil slinger ring, wherein... The lower end of the internal gear bushing is provided with a lower mounting hole, and the lower end of the internal gear bushing is sleeved on the output shaft of the motor through the lower mounting hole. The internal gear bushing rotates synchronously with the output shaft of the motor. The upper end of the internal gear bushing is provided with an upper mounting hole, and an internal gear is provided on the inner wall of the upper mounting hole. The internal gear meshes with the sun gear of the reducer. The oil slinger ring is located at the upper end of the internal gear sleeve. The oil slinger ring rotates synchronously with the internal gear sleeve. The base plate is located below the oil slinger ring. The housing is provided with an oil drain hole.

2. The multi-directional composite dynamic sealing assembly for a permanent magnet semi-direct drive device according to claim 1, characterized in that, An oil seal seat is provided at the center of the base plate, and a skeleton oil seal is installed inside the oil seal seat. The skeleton oil seal can seal the connection between the internal gear bushing and the base plate.

3. The multi-directional composite dynamic sealing assembly for a permanent magnet semi-direct drive device according to claim 1, characterized in that, The base plate has a conical structure, and the center of the base plate is higher than the edge of the base plate.

4. The multi-directional composite dynamic sealing assembly for a permanent magnet semi-direct drive device according to claim 2, characterized in that, The oil drain hole is located at the bottom of the housing, and the oil seal seat is located at a position higher than the oil drain hole.

5. The multi-directional composite dynamic sealing assembly for a permanent magnet semi-direct drive device according to claim 2, characterized in that, The lip of the skeleton oil seal forms a contact dynamic seal with the outer wall of the internal gear bushing.

6. The multi-directional composite dynamic sealing assembly for a permanent magnet semi-direct drive device according to claim 1, characterized in that, The internal gear bushing and the output shaft of the motor are interference fit.

7. The multi-directional composite dynamic sealing assembly for a permanent magnet semi-direct drive device according to claim 2, characterized in that, The oil slinger ring includes an mounting part, a connecting part, and a body. The mounting part, the connecting part, and the body are an integral structure. The cross-section of the mounting part is annular, the cross-section of the body is annular, and the connecting part is a barrel-shaped structure. The upper end of the connecting part is connected to the outer wall of the mounting part, and the lower end of the connecting part is connected to the inner wall of the body.

8. The multi-directional composite dynamic sealing assembly for a permanent magnet semi-direct drive device according to claim 7, characterized in that, The axis of the connecting part is collinear with the axis of the internal gear sleeve. The connecting part is fitted onto the internal gear sleeve with a clearance fit. The mounting part covers the upper end of the internal gear sleeve. The mounting part and the upper end of the internal gear sleeve are connected by bolts. The cross-section of the body is perpendicular to the axis of the internal gear bushing.

9. The multi-directional composite dynamic sealing assembly for a permanent magnet semi-direct drive device according to claim 7, characterized in that, The outer diameter of the main body is larger than the outer diameter of the oil seal seat and smaller than the inner diameter of the housing.

10. The multi-directional composite dynamic sealing assembly for a permanent magnet semi-direct drive device according to claim 7, characterized in that, An annular groove is provided on the outer wall of the internal gear bushing located inside the body, and a sealing ring is provided in the annular groove.

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