Improved sealing structure of motor bearing

Abstract

The utility model relates to the technical field of motor sealing, and discloses an improved motor bearing sealing structure, which is characterized in that a bearing outer cover for limiting the outer side of an assembly bearing is arranged on the outer side surface of a motor end cover, and a bearing inner cover for limiting the inner side of the assembly bearing is arranged on the inner side surface of the motor end cover; a rotating sealing ring in sealing fit with a motor rotating shaft is embedded in the bearing outer cover, fit clearances are formed between the inner ring surface and the side surface of the bearing inner cover and the balance ring, a plurality of concentrically-arranged annular protrusions are arranged on the side surface of the bearing inner cover, and sealing grooves are formed in the balance ring and correspond to the annular protrusions. And a labyrinth gap communicated with the outside is formed between each annular bulge and the sealing groove. According to the improved sealing structure of the motor bearing, on the premise of protecting the assembly bearing, corrosive substances are prevented from entering the motor to the greatest extent, the service life of the motor is prolonged, and the protection grade of the motor is improved.

Description

Technical Field

[0001] This utility model relates to the field of motor sealing technology, and in particular to an improved structure for motor bearing sealing. Background Technology

[0002] The improved seal structure for motor bearings is a sealing structure designed to prevent dust, water, acid gas, and other impurities from entering the bearing and to prevent the loss of bearing lubricant. A well-designed and reliable improved seal structure for motor bearings is crucial for the safe operation of the motor.

[0003] Most existing bearing sealing structures involve placing labyrinth rings outside the bearing. While this can improve sealing performance to some extent, it places high demands on the processing and assembly of components, has poor operational reliability, and is prone to failure. In addition, to ensure the normal and stable function of the bearing, lubricant needs to be added to the bearing structure frequently. This lubricant is not only prone to leakage to the outside, but it can also easily mix with corrosive substances from the outside and enter the motor stator and rotor, affecting the motor's performance and service life.

[0004] Therefore, it is necessary to improve the design of both the inner and outer sides of the bearing to enhance the motor's protection level. Utility Model Content

[0005] The purpose of this invention is to provide an improved sealing structure for motor bearings to solve the problems mentioned in the background section.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] An improved sealing structure for a motor bearing includes a motor shaft and a motor end cover. A mounting bearing is disposed between the motor shaft and the motor end cover. A balance ring is disposed on the motor shaft and inside the mounting bearing. An outer bearing cover is disposed on the outer side of the motor end cover to limit the outer side of the mounting bearing, and an inner bearing cover is disposed on the inner side of the motor end cover to limit the inner side of the mounting bearing. A rotary sealing ring that seals with the motor shaft is embedded on the outer bearing cover. The inner ring surface and side surface of the inner bearing cover form a fitting gap with the balance ring. Several concentrically arranged annular protrusions are disposed on the side surface of the inner bearing cover. A sealing groove is formed on the balance ring corresponding to each annular protrusion. A labyrinth gap connecting the annular protrusions and the sealing grooves is formed between each annular protrusion and the sealing groove.

[0008] As an alternative, the motor shaft, motor end cover, bearing outer cover and bearing inner cover are arranged to form an oil injection cavity, the assembly bearing is located in the oil injection cavity, the labyrinth gap is connected to the oil injection cavity, the outer surface of the motor end cover is provided with an oil injection hole, and the motor end cover is provided with a flow channel that connects the oil injection hole and the oil injection cavity.

[0009] As an alternative, the outer side of the outer ring of the bearing is axially abutted by the bearing cover, and the outer side of the inner ring of the bearing is axially abutted by the retaining ring on the motor shaft.

[0010] As an alternative, a notch is provided on the surface of the outer ring of the bearing near the bearing cover, and a positioning block that mates with the notch is provided on the bearing cover.

[0011] As an alternative, a threaded locking block is provided on the motor shaft, which presses against the retaining ring, keeping the retaining ring against the assembly bearing.

[0012] As an alternative, the inner side of the outer ring of the bearing is axially abutted by the inner cover of the bearing, and the inner side of the inner ring of the bearing is axially abutted by the balance ring.

[0013] As an alternative, the bearings used in the assembly are ball bearings and / or cylindrical roller bearings.

[0014] The beneficial effects of this utility model are:

[0015] This improved motor bearing sealing structure, through the design of a rotating sealing ring on the outer bearing cover, blocks most external debris from entering the bearing assembly. Furthermore, a labyrinth structure is designed between the inner bearing cover and the balance ring, making it difficult for lubricant and debris to flow into the motor. This protects the bearing assembly while minimizing the entry of corrosive substances into the motor, extending its service life and improving its protection level. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the improved motor bearing sealing structure provided in this embodiment of the utility model;

[0017] Figure 2 yes Figure 1 Enlarged view of point A in the middle;

[0018] Figure 3 yes Figure 1 Enlarged view of section B in the middle.

[0019] In the attached image:

[0020] 1. Motor shaft; 2. Motor end cover; 3. Assembly bearing; 4. Balance ring; 5. Bearing outer cover; 6. Bearing inner cover; 7. Rotary seal ring; 8. Fitting clearance; 9. Annular protrusion; 10. Sealing groove; 11. Labyrinth gap; 12. Oil filling chamber; 13. Oil filling hole; 14. Flow channel; 15. Notch; 16. Positioning block; 17. Locking block; 18. Retaining ring; 19. Spacer ring. Detailed Implementation

[0021] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0022] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0023] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0024] In the description of this embodiment, terms such as "upper," "lower," "left," and "right" are based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of description and simplification of operation, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0025] Furthermore, the terms "first" and "second" are merely used to distinguish between different terms in description and do not have any special meaning.

[0026] Please see Figures 1 to 3 As shown, this embodiment provides an improved sealing structure for a motor bearing, including a motor shaft 1 and a motor end cover 2. An assembly bearing 3 is provided between the motor shaft 1 and the motor end cover 2, and a balance ring 4 is provided on the motor shaft 1 and inside the assembly bearing 3.

[0027] Among them, an outer bearing cover 5 is provided on the outer side of the motor end cover 2 to limit the outer side of the assembled bearing 3, and an inner bearing cover 6 is provided on the inner side of the motor end cover 2 to limit the inner side of the assembled bearing 3. A rotary sealing ring 7 is embedded on the outer bearing cover 5 to seal with the motor shaft 1. The inner ring surface and side surface of the inner bearing cover 6 form a fitting gap 8 with the balance ring 4. Several concentric annular protrusions 9 are provided on the side surface of the inner bearing cover 6. A sealing groove 10 is provided on the balance ring 4 corresponding to each annular protrusion 9. A labyrinth gap 11 connecting the annular protrusions 9 and the sealing groove 10 is formed between each annular protrusion 9 and the sealing groove 10.

[0028] Therefore, by designing a rotating sealing ring 7 on the outer cover 5 of the bearing, most of the external debris is blocked from entering the assembly bearing 3. A labyrinth structure is designed between the inner cover 6 of the bearing and the balance ring 4, making it difficult for lubricant and debris at the assembly bearing 3 to flow into the motor. Even if lubricant overflows, the overflow location is at the labyrinth gap 11. Thus, while protecting the assembly bearing 3, corrosive substances are prevented from entering the motor to the greatest extent, extending the service life of the motor and improving the protection level of the motor.

[0029] Optionally, the motor shaft 1, motor end cover 2, bearing outer cover 5 and bearing inner cover 6 enclose each other to form an oil injection cavity 12, the mounting bearing 3 is located in the oil injection cavity 12, the labyrinth gap 11 communicates with the oil injection cavity 12, the outer surface of the motor end cover 2 is provided with an oil injection hole 13, and the motor end cover 2 is provided with a flow channel 14 that communicates the oil injection hole 13 with the oil injection cavity 12.

[0030] Therefore, lubricant can be added to the assembled bearing 3 periodically through the oil injection hole 13 to ensure the stable working condition of the assembled bearing 3.

[0031] Optionally, the outer side of the outer ring of the assembly bearing 3 is axially abutted by the bearing outer cover 5, and the outer side of the inner ring of the assembly bearing 3 is axially abutted by the retaining ring 18 on the motor shaft 1, thereby forming a reliable limit on the outer side of the assembly bearing 3.

[0032] Furthermore, a notch 15 is provided on the surface of the outer ring of the bearing 3 near the bearing cover 5, and a positioning block 16 that mates with the notch 15 is provided on the bearing cover 5.

[0033] Therefore, by engaging the positioning block 16 with the notch 15, the positioning accuracy of the assembled bearing 3 is further improved.

[0034] Furthermore, a threaded locking block 17 is provided on the motor shaft 1, which presses against the retaining ring 18, so that the retaining ring 18 remains against the assembly bearing 3.

[0035] Therefore, the locking block 17 further enhances the limiting function of the retaining ring 18 on the assembled bearing 3.

[0036] Optionally, the inner side of the outer ring of the assembly bearing 3 is axially abutted by the bearing inner cover 6, and the inner side of the inner ring of the assembly bearing 3 is axially abutted by the balance ring 4, thereby forming a reliable limit on the inner side of the assembly bearing 3.

[0037] Optionally, the bearing 3 is a ball bearing and / or a cylindrical roller bearing. This embodiment uses a ball bearing and a cylindrical roller bearing as an example. The ball bearing is limited by the outer bearing cover 5, and the cylindrical roller bearing is limited by the inner bearing cover 6. The ball bearing and the cylindrical roller bearing are separated by a spacer 19.

[0038] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. An improved structure of motor bearing seal, comprising a motor rotating shaft (1) and a motor end cover (2), an assembled bearing (3) is arranged between the motor rotating shaft (1) and the motor end cover (2), a balance ring (4) is arranged on the motor rotating shaft (1) and located on the inner side of the assembled bearing (3), characterized in that, The outer side of the motor end cover (2) is provided with a bearing outer cover (5) for limiting the outer side of the assembly bearing (3), the inner side of the motor end cover (2) is provided with a bearing inner cover (6) for limiting the inner side of the assembly bearing (3), the bearing outer cover (5) is embedded with a rotating sealing ring (7) in sealing cooperation with the motor rotating shaft (1), the inner ring surface and the side surface of the bearing inner cover (6) are both formed with a cooperation gap (8) with the balance ring (4), and the side surface of the bearing inner cover (6) is provided with a plurality of annular protrusions (9) arranged concentrically, and the balance ring (4) is provided with a sealing groove (10) corresponding to each annular protrusion (9), and the annular protrusion (9) and the sealing groove (10) form a labyrinth gap (11) communicating with the outside.

2. The motor bearing seal improvement of claim 1 wherein, The motor rotating shaft (1), the motor end cover (2), the bearing outer cover (5) and the bearing inner cover (6) form an oil injection cavity (12) therebetween, the assembly bearing (3) is located in the oil injection cavity (12), the labyrinth gap (11) communicates with the oil injection cavity (12), and the outer surface of the motor end cover (2) is provided with an oil injection hole (13), and the motor end cover (2) is provided with a flow channel (14) communicating the oil injection hole (13) with the oil injection cavity (12).

3. The motor bearing seal improvement of claim 1 wherein, The outer side of the outer ring part of the assembly bearing (3) is axially abutted by the bearing outer cover (5), and the outer side of the inner ring part of the assembly bearing (3) is axially abutted by the stop ring (18) on the motor rotating shaft (1).

4. The motor bearing seal improvement of claim 3 wherein, The surface of the outer ring part of the assembly bearing (3) close to the bearing outer cover (5) is provided with a notch (15), and the bearing outer cover (5) is provided with a positioning block (16) matched with the notch (15).

5. The motor bearing seal improvement of claim 3 wherein, The motor rotating shaft (1) is provided with a threaded locking block (17), the locking block (17) presses the stop ring (18), so that the stop ring (18) abuts against the assembly bearing (3).

6. The motor bearing seal improvement of claim 1 wherein, The inner side of the outer ring part of the assembly bearing (3) is axially abutted by the bearing inner cover (6), and the inner side of the inner ring part of the assembly bearing (3) is axially abutted by the balance ring (4).

7. The motor bearing seal improvement of claim 1 wherein, The assembly bearing (3) is a ball bearing and / or a cylindrical roller bearing.

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