Plastic package direct current motor with dustproof structure

Abstract

The utility model discloses a plastic package direct current motor with dustproof structure, including stator and the plastic package spare of cladding in the outside of stator, install rotor in the plastic package spare, the front end cover is fixed in the middle part of the front end of plastic package spare, and the front end cover and plastic package spare are directly fixed together when injection moulding directly, and the front part of the rotating shaft of rotor projects the middle part through -hole of front end cover, it realizes the sealing of front part through the elastic rubber sealing block at the front end cover, realizes rear sealing also through rear end cover to guarantee the normal rotation of rotor, guarantees the service life of whole motor.

Description

Technical Field

[0001] This utility model relates to the field of motor equipment technology, and more specifically to a plastic-encapsulated DC motor with a dustproof structure. Background Technology

[0002] Plastic-encapsulated DC motors use plastic encapsulation technology to encapsulate the stator core and windings of the motor entirely with engineering plastics (such as BMC). The rotor is located within a cavity in the center of the plastic-encapsulated housing, with end caps covering the open ends of the housing. Additionally, a front end cap is installed at the point where the rotor shaft extends out of the housing.

[0003] The gap between the central through hole at the front cover and the outer wall of the shaft allows external water or dust to enter the motor through the gap, affecting the normal rotation of the rotor and the normal operation of the motor. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a plastic-encapsulated DC motor with a dustproof structure. It achieves front sealing through an elastic rubber sealing block at the front end cover and rear sealing through the rear end cover, thereby ensuring normal rotor rotation and guaranteeing the service life of the entire motor.

[0005] The solution of this utility model to the aforementioned technical problem is:

[0006] A dustproof encapsulated DC motor includes a stator and an encapsulated component covering the outside of the stator. A rotor is installed in the encapsulated component. A front end cover is fixed to the middle of the front end of the encapsulated component. The front end cover and the encapsulated component are directly fixed together during injection molding. The front part of the rotor shaft extends out of the middle through hole of the front end cover. Its structure is basically the same as the existing structure and will not be described in detail here.

[0007] The front end cover has a forward-extending sleeve portion formed at the edge of the middle front face. A rotating shaft has an annular groove formed on the outer side of the sleeve portion. An elastic rubber sealing block is inserted into the rotating shaft. The inner sidewall of the middle part of the elastic rubber sealing block is embedded in the annular groove. An outer annular block is fixed at the outer sidewall of the elastic rubber sealing block. A self-lubricating sleeve is fixed on the inner sidewall of the sleeve portion. The outer sidewall of the outer annular block is in close contact with the inner sidewall of the self-lubricating sleeve.

[0008] An annular self-lubricating layer is fixed on the front surface of the middle part of the front end cover, and the rear end face of the outer annular block is in close contact with the front end face of the annular self-lubricating layer.

[0009] A front limiting annular plate is fixed on the front end face of the sleeve body. The front part of the rotor shaft extends out of the middle through hole of the front limiting annular plate. An annular groove is formed on the rear wall surface of the front limiting annular plate. The front annular wear-resistant plate is nested in the annular groove. Its front end face is pressed against the front end face of the annular groove and is fixed by adhesive. The rear end face of the front annular wear-resistant plate is pressed against the front end face of the outer annular block.

[0010] The rear end cap is fitted into the middle of the rear end of the molding compound. The edge of the front end face of the rear end cap is formed with a forward-extending rear sleeve fitting part. The outer wall of the rear sleeve fitting part is pressed against and fixed to the inner wall of the rear end of the molding compound.

[0011] The outstanding effect of this utility model is:

[0012] It achieves front sealing through an elastic rubber sealing block at the front end cover and rear sealing through the rear end cover, thus ensuring normal rotor rotation and extending the overall lifespan of the motor. Furthermore, the outer annular block installed at the elastic rubber sealing block provides a guiding function, preventing the elastic rubber sealing block from deflecting and ensuring its proper sealing effect. Attached Figure Description

[0013] Figure 1 This is a partial structural schematic diagram of the present invention;

[0014] Figure 2 yes Figure 1 A magnified view of a portion of the image;

[0015] Figure 3 yes Figure 1 A magnified view of another part. Detailed Implementation

[0016] For example, see below. Figures 1 to 3 As shown, a plastic-encapsulated DC motor with a dustproof structure includes a stator 10 and a plastic encapsulation 20 covering the outside of the stator 10. A rotor 30 is installed in the plastic encapsulation 20. A front end cover 40 is fixed to the middle of the front end of the plastic encapsulation 20. The front end cover 40 is formed and fixed together with the plastic encapsulation 20 during injection molding.

[0017] The front part of the rotor 30's shaft extends out of the middle through hole of the front end cover 40;

[0018] Furthermore, the front end cover 40 has a forward-extending sleeve portion 41 formed on the edge of the middle front end face. The rotating shaft has an annular groove 11 formed on the outer side of the sleeve portion 41. The elastic rubber sealing block 12 is inserted into the rotating shaft, that is, the elastic rubber sealing block 12 has a central through hole formed in the middle. The rotating shaft is inserted into the central through hole. The inner sidewall of the central through hole of the elastic rubber sealing block 12 is embedded in the annular groove 11. An outer annular block 13 is fixed on the outer sidewall of the elastic rubber sealing block 12. A self-lubricating sleeve 14 is fixed on the inner sidewall of the sleeve portion 41. The outer sidewall of the outer annular block 13 is in close contact with the inner sidewall of the self-lubricating sleeve 14.

[0019] An annular self-lubricating layer 42 is fixed on the middle front surface of the front end cover 40. The annular self-lubricating layer 42 is located in the sleeve part 41, and the rear end face of the outer annular block 13 is in close contact with the front end face of the annular self-lubricating layer 42.

[0020] A front limiting annular plate 131 is fixed on the front end face of the sleeve part 41. The front part of the rotor 30's shaft extends out of the middle through hole of the front limiting annular plate 131. An annular groove is formed on the rear wall surface of the front limiting annular plate 131. The front annular wear-resistant plate 132 is nested in the annular groove. Its front end face is pressed against the front end face of the annular groove and fixed by adhesive. The rear end face of the front annular wear-resistant plate 132 is pressed against the front end face of the outer annular block 13.

[0021] With the above structure, the elastic rubber sealing block 12 can prevent external dust and other substances from entering through the gap between the inner wall of the central through hole of the front cover 40 and the outer wall of the rotating shaft, thus achieving a dustproof effect. At the same time, the outer wall, front face and rear face of its outer annular block 13 are in close contact with the inner wall of the corresponding self-lubricating sleeve 14, the front annular wear-resistant plate 132 and the annular self-lubricating layer 42, thus also having a certain waterproof effect.

[0022] Furthermore, a rear end cap 50 is fitted into the middle of the rear end of the molding compound 20. The edge of the front end face of the rear end cap 50 is formed with a forward-extending rear sleeve retaining part 51. The outer side wall of the rear sleeve retaining part 51 presses against and is fixed to the inner side wall of the rear end of the molding compound 20. An adhesive can also be applied between the two to further achieve fixation. The rear end cap 50 also has a dustproof effect on the rear end.

[0023] Furthermore, the rear end face of the plastic seal 20 is formed with a rearwardly extending annular protrusion 21, and an internal thread is formed on the inner side wall of the annular protrusion 21. The rear elastic sealing cover 60 is screwed onto the internal thread, and the middle of the front end face of the rear elastic sealing cover 60 is pressed against the middle of the rear end face of the rear end cover 50.

[0024] The rear end cover 50 is a metal cover, and the rear elastic sealing cover 60 has a stepped through hole formed in the middle. Its front end is a small diameter hole segment and its rear end is a large diameter hole segment. The heat-conducting metal block 61 is fixed in the stepped through hole, and its front end face is pressed against the middle of the rear wall surface of the rear end cover 50.

[0025] The heat-conducting metal block 61 is also stepped, with a large diameter at the rear end and a small diameter at the front end. It is fitted into the stepped through hole and cooperates with the stepped through hole. This structure allows the heat generated during operation of this embodiment to be transferred to the heat-conducting metal block 61 through the rear end cover 50, thereby contacting the outside and improving the heat dissipation effect.

[0026] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A plastic-encapsulated DC motor with a dustproof structure, comprising a stator (10) and a plastic encapsulation (20) covering the outside of the stator (10), wherein a rotor (30) is installed in the plastic encapsulation (20), characterized in that: The front end cover (40) is fixed at the middle of the front end of the plastic seal (20), and the front part of the rotor (30) shaft extends out of the middle through hole of the front end cover (40); The front end cover (40) has a forward-extending sleeve (41) formed on the edge of the middle front end face. The rotating shaft has an annular groove (11) formed on the outer side of the sleeve (41). The elastic rubber sealing block (12) is inserted into the rotating shaft. The inner sidewall of the middle part of the elastic rubber sealing block (12) is embedded in the annular groove (11). An outer annular block (13) is fixed on the outer sidewall of the elastic rubber sealing block (12). A self-lubricating sleeve (14) is fixed on the inner sidewall of the sleeve (41). The outer sidewall of the outer annular block (13) is close to the inner sidewall of the self-lubricating sleeve (14).

2. The encapsulated DC motor with a dustproof structure according to claim 1, characterized in that: An annular self-lubricating layer (42) is fixed on the middle front surface of the front end cover (40), and the rear end face of the outer annular block (13) is in close contact with the front end face of the annular self-lubricating layer (42).

3. A plastic-encapsulated DC motor with a dustproof structure according to claim 1, characterized in that: A front limiting annular plate (131) is fixed on the front end face of the sleeve part (41). The front part of the rotor (30) shaft extends out of the middle through hole of the front limiting annular plate (131). An annular groove is formed on the rear wall surface of the front limiting annular plate (131). The front annular wear-resistant plate (132) is nested in the annular groove. Its front end face is pressed against the front end face of the annular groove and fixed by adhesive. The rear end face of the front annular wear-resistant plate (132) is pressed against the front end face of the outer annular block (13).

4. A plastic-encapsulated DC motor with a dustproof structure according to claim 1, characterized in that: The rear end cap (50) is fitted in the middle of the rear end of the plastic seal (20). The edge of the front end face of the rear end cap (50) is formed with a forward-extending rear sleeve fitting part (51). The outer side wall of the rear sleeve fitting part (51) is pressed against and fixed on the inner side wall of the rear end of the plastic seal (20).

5. A plastic-encapsulated DC motor with a dustproof structure according to claim 4, characterized in that: The rear end face of the plastic seal (20) is formed with a rearwardly extending annular protrusion (21), and an internal thread is formed on the inner side wall of the annular protrusion (21). The rear elastic sealing cap (60) is screwed onto the internal thread, and the middle of the front end face of the rear elastic sealing cap (60) is pressed against the middle of the rear end face of the rear end cap (50).

6. A plastic-encapsulated DC motor with a dustproof structure according to claim 5, characterized in that: The rear end cover (50) is a metal cover, and the middle part of the rear elastic sealing cover (60) is formed with a stepped through hole. Its front end is a small diameter hole segment and its rear end is a large diameter hole segment. The heat-conducting metal block (61) is fixed in the stepped through hole, and its front end face is pressed against the middle part of the rear wall surface of the rear end cover (50).

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