Waterproof motor

Abstract

The utility model relates to the technical field of motors, and discloses a waterproof motor, which comprises a casing with a central hole and an annular cavity formed inside, a stator assembly is assembled in the annular cavity and comprises a winding coil and an insulating framework for winding the winding coil and preventing the winding coil from being in contact with the casing, a filling space for filling liquid plastic to achieve sealing exists among the insulation framework, the winding coil and the machine shell, the plastic in the filling space is solidified to form a first sealing protection layer, and the machine shell is provided with a feeding port which is communicated with the filling space and used for injecting flowing plastic. The insulating framework is provided with the first sealing structure for improving the sealing performance of the joint of the insulating framework and the plastic, and the waterproof motor is provided with the first sealing structure, so that the sealing performance of the joint of the plastic and the insulating framework after the plastic is filled and cured is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of motors, in particular to a waterproof motor. Background Art

[0002] As a tool for converting electrical energy into mechanical energy, motors are widely used in various electric devices. Different types of electric devices have different working environments. Some electric devices need to work underwater, so motors are required to have waterproof performance.

[0003] Comparative Document 1: Chinese Patent with Application No. 202221579514.3 discloses an elevator door motor and an elevator. The elevator door motor includes a rotor assembly and a stator assembly, and the rotor assembly can rotate relative to the stator assembly; the stator assembly includes: a stator, fixedly arranged relative to the rotor assembly; an insulating skeleton, mounted on the stator; and a coil, wound around the insulating skeleton to form a winding.

[0004] Comparative Document 2: The application text of Chinese Patent with Application No. 202111277972.1 discloses a method for demolding and manufacturing a waterproof DC motor. The demolding steps are as follows: A. Place the motor in a mold; B. The staff injects glue into the mold through a glue injector so that the plastic is in full contact with the motor; C. After natural cooling, the user takes out the motor from the mold; D. After taking it out, trim the solidified glue on the surface of the motor.

[0005] Comparative Document 1 discloses the internal structure of the motor, and Comparative Document 2 discloses that by injecting plastic into the inner cavity of the motor, a sealed protective layer that seals and wraps the coil is formed after the plastic solidifies.

[0006] However, the coil is wound around the insulating skeleton, and the contact surface between the plastic and the insulating skeleton is a plane, and the tightness of the combination between the two is relatively low, resulting in poor sealing performance between the two, exposing the coil to water and causing the waterproof function to fail. Summary of the Utility Model

[0007] Aiming at the disadvantage of poor sealing performance at the connection between the plastic and the insulating skeleton after solidification in the prior art, the utility model provides a waterproof motor.

[0008] To solve the above technical problems, the utility model is solved by the following technical solutions:

[0009] A waterproof motor, comprising a housing having a central hole and an annular chamber formed inside, a stator assembly is assembled in the annular chamber, the stator assembly includes a winding coil and an insulating skeleton for winding the winding coil and preventing the winding coil from contacting the housing, there is a filling space for filling with liquid plastic to achieve sealing between the insulating skeleton, the winding coil and the housing, and after the plastic in the filling space is cured, a first sealing protection layer is formed, a feed port communicating with the filling space and used for injecting flowing plastic is arranged on the housing, and a first sealing structure for increasing the sealing performance at the joint between it and the plastic is arranged on the insulating skeleton.

[0010] Adopting the above scheme, the housing is placed in a mold for injecting glue, and the plastic enters the annular chamber through the feed port to completely fill the filling space, that is, the insulating skeleton and the winding coil are completely wrapped by the plastic to achieve sealing. After the plastic is cured, it is coated on the stator assembly. And a first sealing structure is arranged on the insulating skeleton to increase the sealing performance between the plastic and the insulating skeleton, improve the waterproof performance, and at the same time increase the bonding firmness, thereby increasing the connection strength and reducing the possibility of the two separating.

[0011] Preferably, the first sealing structure is a plurality of protrusions and / or grooves that bite with the cured plastic and / or a convex ring concentric with the central hole and / or a concave ring concentric with the central hole.

[0012] Adopting the above scheme, since a plurality of protrusions or grooves or convex rings or concave rings are arranged on the insulating skeleton, the plastic is filled in the grooves or concave rings, or filled in the clamping grooves formed between adjacent protrusions or convex rings. After the plastic is cured, it bites with the protrusions or grooves or convex rings or concave rings, increasing the sealing performance and bonding firmness between the cured plastic and the insulating skeleton.

[0013] Preferably, the first sealing structure is arranged on the outer wall and / or inner wall of the insulating skeleton.

[0014] Adopting the above scheme, since there is a filling space for filling with liquid and curable plastic between the insulating skeleton, the winding coil and the housing to achieve sealing, so arranging the first sealing structure on the outer wall and / or inner wall of the insulating skeleton can achieve biting with the cured plastic.

[0015] Preferably, the cross-section of the insulating skeleton is in a "U" shape with the opening facing away from the central hole, the first sealing structure is arranged on the outer wall of the insulating skeleton, and an expansion structure for increasing the injection glue thickness that bites with the first sealing structure is arranged between the housing and the first sealing structure.

[0016] With the above solution, to ensure the connection strength after the first sealing structure and the cured plastic are interlocked, a certain thickness is required at the interlocking part of the plastic and the first sealing structure. And to ensure the winding space of the winding coil, the first sealing structure needs to be arranged on the outer wall of the insulating skeleton, and then an expansion structure is arranged between the housing and the first sealing structure to increase the thickness of the injected glue for the interlocking of the plastic and the first sealing structure.

[0017] Preferably, the expansion structure includes a convex part that bulges from the housing in a direction away from the first sealing structure and an expansion space formed between the convex part and the first sealing structure to increase the filling thickness of the plastic.

[0018] With the above solution, by deforming the housing to bulge outwards, an expansion space for increasing the filling thickness of the plastic is formed.

[0019] Preferably, a rubber coating layer is provided on the outside of the housing except for the inner wall of the central hole.

[0020] With the above solution, the motor is placed in a mold for injecting glue, and after the plastic is cured, a rubber coating layer is formed to block the feed port and further improve the waterproof performance. The outer wall of the housing located inside the central hole is not coated with the rubber coating layer.

[0021] Preferably, a cover for completely blocking the central hole is provided at one end of the housing, and a circular folded edge is turned outwards at the opening of the cover, and the circular folded edge is hermetically embedded between the rubber coating layer and the outer wall of the housing.

[0022] With the above solution, one end of the central hole is used to insert the rotor assembly, and the other end can be closed to form a seal. By providing a cover to block one end of the central hole and limiting the circular folded edge between the rubber coating layer and the outer wall of the housing through the rubber coating layer formed by injecting glue, the cover is fixed on the housing.

[0023] Preferably, a second sealing structure that interlocks with the cured rubber coating layer is convexly provided on one side of the circular folded edge close to the rubber coating layer.

[0024] With the above solution, the second sealing structure is provided to increase the sealing performance between the plastic and the circular folded edge, and at the same time improve the bonding firmness.

[0025] Preferably, a wiring part with one end extending outside the rubber coating layer is fixedly provided on the insulating skeleton, a protective cover is clamped on the rubber coating layer, a glue injection chamber with an opening and for injecting and sealing the wiring part with epoxy sealant is formed between the protective cover and the rubber coating layer, and a wire that is sealed and passes out to the outside is connected to the wiring part.

[0026] With the above solution, one end of the wiring part located inside the casing is connected to the insulating skeleton and protected by the rubber coating layer to achieve waterproofing. However, the other end penetrates through the rubber coating layer and is located outside the rubber coating layer. Therefore, a protective cover needs to be added. After the protective cover is snap-fitted onto the rubber coating layer, a glue injection chamber with an opening is formed by enclosing with the rubber coating layer. Glue is injected into the glue injection chamber until the epoxy sealant completely submerges the wiring part, so that the epoxy sealant completely wraps the wiring part after curing, and one end of the wire is hermetically led out to the outside for subsequent electrical connection.

[0027] Preferably, a buckle for fixing the rotor assembly is provided on the side of the rubber coating layer away from the cover. The buckle includes a clamping section that cooperates with the rubber coating layer to clamp the rotor assembly and an installation part provided on the clamping section and fixedly connected to the rubber coating layer. The installation part includes a horizontal section parallel to the clamping section and a connecting section with two ends respectively connected to the horizontal section and the clamping section. A fixing slot for inserting the horizontal section is provided on the rubber coating layer.

[0028] With the above solution, after one end of the rotor assembly is inserted into the central hole, it needs to be fixed on the casing. Therefore, a buckle is required. The installation part of the buckle is fixedly connected to the rubber coating layer, so that the clamping section of the buckle is located on the side of the casing away from the cover and is parallel to the rubber coating layer on that side. After the rotor assembly is assembled, the clamping section and the rubber coating layer cooperate to clamp the rotor assembly. The force direction between the clamping section and the rotor assembly is along the axial direction of the central hole. If a connecting section is directly provided to engage with the rubber coating layer through friction, the buckle is likely to break away from the rubber coating layer. Therefore, a horizontal section parallel to the clamping section is provided and the horizontal section is inserted into the fixing slot for fixation, making the installation of the buckle more secure.

[0029] Due to the adoption of the above technical solutions, the present utility model has remarkable technical effects: the plastic is cured and engages with the protrusion or groove or convex ring or concave ring, increasing the sealing performance and the bonding firmness between the cured plastic and the insulating skeleton; the rubber coating layer seals the feeding port and fixes the cover on the casing, and a protective cover is added and glue is injected into the glue injection chamber to seal the wiring part, further increasing the sealing and waterproof performance. Description of the Drawings

[0030] Figure 1 is a schematic diagram of a waterproof motor in the embodiment;

[0031] Figure 2 is a top view of a waterproof motor in the embodiment;

[0032] Figure 3 is Figure 2 the cross-sectional view taken along A-A in

[0033] Figure 4 is Figure 3 the enlarged view at B in

[0034] Figure 5It is an exploded view of a waterproof motor in an embodiment.

[0035] The names of the parts referred to by the respective numerical labels in the above drawings are as follows: 1. Central hole; 2. Annular chamber; 3. Housing; 4. Stator assembly; 401. Winding coil; 402. Insulating skeleton; 5. Filling space; 6. Feed port; 7. First sealing protective layer; 8. Convex ring; 9. Convex part; 10. Expansion space; 11. Rubber coating layer; 12. Cover; 13. Annular flange; 14. Annular bump; 15. Wiring part; 16. Protective cover; 17. Glue injection chamber; 18. Second sealing protective layer; 19. Conducting wire; 20. Card slot; 21. Card block; 22. Snap fastener; 2201. Clamping section; 2202. Horizontal section; 2203. Connecting section; 23. Fixed slot. Detailed implementation mode

[0036] The present utility model will be further described in detail below in conjunction with the drawings and embodiments.

[0037] Embodiment

[0038] A waterproof motor, referring to Figures 1 to 5 , includes a housing 3 with a central hole 1 penetrating through the center. There is an annular chamber 2 inside the housing 3. A feed port 6 is provided on the outer wall of the housing 3 away from the central hole 1 to communicate the annular chamber 2 with the outside.

[0039] A stator assembly 4 is assembled in the annular chamber 2. The stator assembly 4 includes an insulating skeleton 402 fixedly arranged in the annular chamber 2. The insulating skeleton 402 is arranged in an annular shape concentric with the central hole 1, and the cross-section of the insulating skeleton 402 is in a "U" shape with the opening facing away from the central hole 1. The stator assembly 4 further includes a winding coil 401 wound in the "U" - shaped opening of the insulating skeleton 402. Since the winding coil 401 is located in the "U" - shaped opening of the insulating skeleton 402, the winding coil 401 is prevented from contacting the housing 3.

[0040] There is a filling space 5 between the insulating skeleton 402, the winding coil 401 and the housing 3 for filling with a liquid and curable plastic to achieve sealing. The plastic enters the annular chamber 2 through the feed port 6 and completely fills the filling space 5. After the plastic is cured, a first sealing protective layer 7 is formed to seal and coat the stator assembly 4.

[0041] A first sealing structure is provided on the insulating skeleton 402 to increase the sealing performance between the insulating skeleton 402 and the first sealing protective layer 7. The first sealing structure is a number of protrusions and / or grooves that engage with the first sealing protective layer 7 and / or a convex ring 8 concentric with the central hole 1 and / or a concave ring concentric with the central hole 1. In this embodiment, the first sealing structure is a number of convex rings 8 concentric with the central hole 1.

[0042] A plurality of convex rings 8 are arranged on the outer wall of the insulating skeleton 402, where the outer wall of the insulating skeleton 402 is the side wall of the insulating skeleton 402 that is far from the winding coil 401 and close to the inner wall of the machine housing 3. The machine housing 3 deforms and bulges in a direction away from the convex ring 8 to form a convex portion 9, so that an expansion space 10 for increasing the plastic filling thickness is formed between the convex portion 9 and the convex ring 8.

[0043] An encapsulation layer 11 is provided on the outside of the machine housing 3 except for the inner wall of the central hole 1. One end of the machine housing 3 is provided with a cover 12 that can completely block the central hole 1. An annular flange 13 is turned outwards at the opening of the cover 12, and the annular flange 13 is hermetically embedded between the encapsulation layer 11 and the outer wall of the machine housing 3.

[0044] On one side of the annular flange 13 close to the encapsulation layer 11, a second sealing structure that engages with the cured encapsulation layer 11 protrudes. The second sealing structure is at least one annular protrusion 14 that engages with the encapsulation layer 11 and is concentric with the central hole 1.

[0045] A wiring portion 15 is fixedly arranged on the insulating skeleton 402, and one end of the wiring portion 15 extends away from the central hole 1 to the outside of the encapsulation layer 11. A protective cover 16 is clamped on the encapsulation layer 11. An injection cavity 17 with an opening is formed between the protective cover 16 and the encapsulation layer 11. One end of the wiring portion 15 away from the insulating skeleton 402 is located in the injection cavity 17. Epoxy sealant is injected into the injection cavity 17 to completely submerge and seal the wiring portion 15. After the epoxy sealant cures, a second sealing protection layer 18 that hermetically wraps the wiring portion 15 is formed. A wire 19 is connected to the wiring portion 15 and hermetically passes through the second sealing protection layer 18 to the outside.

[0046] A card slot 20 is recessed on the encapsulation layer 11, and a card block 21 protrudes on the protective cover 16. The card block 21 is inserted into the card slot 20 to achieve the clamping connection between the encapsulation layer 11 and the protective cover 16.

[0047] On the side of the encapsulation layer 11 away from the cover 12, a buckle 22 for fixing the rotor assembly is provided. The buckle 22 includes a clamping section 2201 and a mounting portion that are fixedly connected. The clamping section 2201 is parallel to the side of the encapsulation layer 11 away from the cover 12 and can cooperate with the encapsulation layer 11 to clamp the rotor assembly. The mounting portion is fixedly connected to the encapsulation layer 11. The mounting portion includes a horizontal section 2202 parallel to the clamping section 2201 and a connecting section 2203 whose two ends are respectively connected to the horizontal section 2202 and the clamping section 2201. A fixing slot 23 for horizontally inserting the horizontal section 2202 is provided on the encapsulation layer 11. The rotor assembly is a prior art and is not shown in the figure and will not be elaborated here.

[0048] The housing 3 is placed into the mold, the cover 12 is lapped on the outer wall of the housing 3 to block the central hole 1, and glue is injected into the mold. Part of the plastic enters the annular chamber 2 through the feed port 6 and fills the clamping groove formed between the filling space 5 and several convex rings 8; part of the plastic wraps around the outside of the housing 3 and fills the space between the annular flange 13 and the annular bump 14. After the plastic solidifies, the plastic in the annular chamber 2 solidifies to form the first sealing protective layer 7 that hermetically wraps the stator assembly 4. The first sealing protective layer 7 engages with the convex ring 8 to increase the sealing performance between the first sealing protective layer 7 and the insulating skeleton 402; the plastic outside the housing 3 forms a rubber coating layer 11 that covers the outer wall of the housing 3 except for the inner wall of the central hole 1, and the cover 12 is fixed to the housing 3 by clamping the annular flange 13 tightly between the rubber coating layer 11 and the outer wall of the housing 3. The rubber coating layer 11 engages with the annular flange 13 to increase the sealing performance between the rubber coating layer 11 and the cover 12.

[0049] After demolding, one end of the wiring part 15 away from the insulating skeleton 402 is exposed outside the rubber coating layer 11, and a card slot 20 and a fixing slot 23 are formed on the rubber coating layer 11. The card block 21 on the protective cover 16 is inserted into the card slot 20 to snap the protective cover 16 onto the rubber coating layer 11 to form an injection chamber 17. Epoxy sealant is injected into the injection chamber 17 to completely submerge the sealed wiring part 15. After the epoxy sealant solidifies, it forms the second sealing protective layer 18 that hermetically wraps the wiring part 15. A wire 19 is connected to the wiring part 15 and passes through the second sealing protective layer 18 to the outside. The horizontal section 2202 of the buckle 22 is inserted into the fixing slot 23 to complete the installation of the buckle 22.

[0050] The above are only the preferred embodiments of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions falling within the concept of the present invention belong to the protection scope of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements should also be regarded as within the protection scope of the present invention.

Claims

1. A waterproof motor, comprising a casing (3) having a central hole (1) and an annular chamber (2) formed therein, a stator assembly (4) being mounted in the annular chamber (2), the stator assembly (4) comprising a winding coil (401) and an insulating frame (402) for the winding coil (401) to be wound around and preventing the winding coil (401) from contacting the casing (3), a filling space (5) for filling with liquid plastic to achieve sealing is provided between the insulating frame (402), the winding coil (401) and the casing (3), the plastic in the filling space (5) forms a first sealing protective layer (7) after solidification, and a feed port (6) is provided on the casing (3) for injecting flowing plastic, characterized in that: The insulating frame (402) is provided with a first sealing structure for increasing the sealing performance of the joint between the insulating frame (402) and the plastic.

2. A waterproof motor according to claim 1, characterized in that: The first sealing structure is a plurality of protrusions and / or grooves that engage with the solidified plastic and / or a protruding ring (8) concentric with the center hole (1) and / or a concave ring concentric with the center hole (1).

3. A waterproof motor according to claim 2, characterized in that: The first sealing structure is arranged on the outer wall and / or the inner wall of the insulating frame (402).

4. A waterproof motor according to claim 3, characterized in that: The cross section of the insulating frame (402) is in a "U" shape with the opening facing away from the central hole (1); the first sealing structure is arranged on the outer wall of the insulating frame (402); and an expansion structure for increasing the injection thickness that engages with the first sealing structure is arranged between the housing (3) and the first sealing structure.

5. A waterproof motor according to claim 4, characterized in that: The expansion structure comprises a convex portion (9) protruding from the housing (3) in a direction away from the first sealing structure, and an expansion space (10) formed between the convex portion (9) and the first sealing structure for increasing the thickness of the plastic filling.

6. The waterproof motor according to claim 1, characterized in that: The outside of the casing (3) except the inner wall of the central hole (1) is covered with a rubber coating layer (11).

7. A waterproof motor according to claim 6, characterized in that: A cover (12) capable of completely covering the central hole (1) is disposed at one end of the casing (3); an annular folded edge (13) is folded outward at the opening of the cover (12); and the annular folded edge (13) is sealingly embedded between the rubber coating layer (11) and the outer wall of the casing (3).

8. A waterproof motor according to claim 7, characterized in that: A second sealing structure is protrudingly provided on one side of the annular folded edge (13) close to the rubber coating layer (11) and engages with the cured rubber coating layer (11).

9. The waterproof motor according to claim 6, characterized in that: A wiring portion (15) having one end extending outside the rubber coating (11) is fixedly provided on the insulating frame (402); a protective cover (16) is clamped on the rubber coating (11); a glue injection chamber (17) having an opening and capable of injecting epoxy sealant to seal the wiring portion (15) is formed between the protective cover (16) and the rubber coating (11); and a wire (19) is connected to the wiring portion (15) and is sealed and passed through to the outside.

10. The waterproof motor according to claim 6, characterized in that: A buckle (22) for fixing the rotor assembly is provided on a side of the rubber coating (11) away from the cover (12); the buckle (22) comprises a clamping section (2201) cooperating with the rubber coating (11) to clamp the rotor assembly, and a mounting portion provided on the clamping section (2201) and fixedly connected to the rubber coating (11); the mounting portion comprises a horizontal section (2202) parallel to the clamping section (2201) and a connecting section (2203) with two ends respectively connected to the horizontal section (2202) and the clamping section (2201); and a fixing slot (23) for inserting the horizontal section (2202) is provided on the rubber coating (11).

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