Brushless motor iron core plastic coating mold

Abstract

The utility model relates to a brushless motor iron core plastic coating mould which is provided with an upper mould body, a lower mould body and a middle mould body, a forming mould is arranged in the middle mould body, a cavity for placing a motor iron core to be coated with plastic is arranged in the forming mould, an injection molding runner is arranged between the upper mould body and the cavity of the forming mould, four plastic coating areas are uniformly distributed in the circumferential direction of the motor iron core, and the plastic coating areas are arranged in the middle mould body. Two spaced inserts are positioned and arranged in the cavity corresponding to each plastic coating area, the lower ends of the two inserts in each plastic coating area are embedded in the motor iron core, the upper ends of the two inserts are matched with the upper end of the cavity, and exhaust grooves are formed in the outer side surfaces of the inserts. According to the utility model, the inserts of which the outer side surfaces are provided with the exhaust grooves are positioned in the four plastic coating areas of the motor iron core, so that trapped air generated on the surface of the motor iron core can be timely exhausted through the exhaust grooves in the plastic coating process, the collapse phenomenon of the plastic coating areas caused by accumulation of the trapped air in the plastic coating areas can be effectively prevented, and the service life of the motor iron core is prolonged. And the plastic coating quality of the surface of the motor iron core is ensured.

Description

Technical Field

[0001] This utility model relates to the field of mold technology, and in particular to a plastic mold for encasing a brushless motor core. Background Technology

[0002] The core of a brushless motor requires a plastic coating process using injection molding. PPS GF40 is a glass fiber reinforced polyphenylene sulfide (PPS) material containing 40% glass fiber. This material has high strength, high rigidity, and good heat resistance, making it suitable for manufacturing high-temperature engineering plastic profiles. Therefore, it is commonly used for plastic coating the surface of brushless motor cores.

[0003] The plastic coating mold for brushless motor cores is used to inject molten plastic particles into the motor core mold, which then cools to form a fixed structure to meet the insulation requirements of the motor. However, during the plastic coating process, due to the characteristics of PPS GF40 material, air entrapment often occurs on the surface of the core. Moreover, as the injection process continues, the air entrapment becomes more severe, even causing the injection area to collapse, thus affecting the quality of the plastic coating on the core surface. Utility Model Content

[0004] The technical problem to be solved by this utility model is: in order to overcome the shortcomings of the prior art, this utility model provides a brushless motor core encapsulation mold that can eliminate air entrapment during the injection molding process and ensure the quality of the encapsulation.

[0005] The technical solution adopted by this utility model to solve its technical problem is: a brushless motor core plastic coating mold, which has an upper mold body, a lower mold body and an intermediate mold body disposed between the upper mold body and the lower mold body. The intermediate mold body is provided with a forming mold, and the forming mold has a cavity for placing the motor core to be plastic coated. An injection flow channel is provided between the upper mold body and the cavity of the forming mold. The motor core is evenly distributed with four plastic coating areas around its circumference. Two inserts are positioned in the cavity of each plastic coating area, and the lower ends of the two inserts in each plastic coating area are embedded in the motor core. The upper ends of the two inserts cooperate with the upper end of the cavity. An exhaust groove is provided on the outer surface of the insert.

[0006] Preferably, the diameter of the exhaust groove is 1.5 to 2 mm.

[0007] Specifically, the exhaust groove includes a main exhaust groove located on the upper part of the insert, and the lower end of the main exhaust groove is connected to a branch exhaust groove corresponding to the inner and outer sides of the motor core. The branch exhaust groove is connected to the plastic-coated area of ​​the inner and outer sides of the motor core.

[0008] Furthermore, the molding mold includes an upper mold, a middle mold, and a lower mold. The upper mold has a mold core with a central hole at its center. The bottom surface of the mold core has four arc-shaped flow channels corresponding to the four plastic coating areas. The injection flow channels are connected to the upper end of the central hole, and the lower end of the central hole is connected to the arc-shaped flow channels.

[0009] To facilitate the ejection of the plastic-coated motor core from the mold, a push plate is installed inside the lower mold body, and the push plate is equipped with a push rod that can eject the plastic-coated motor core.

[0010] The beneficial effects of this utility model are as follows: By positioning and setting inserts with exhaust grooves on the outer surface in the four plastic coating areas of the motor core, the trapped air generated on the surface of the motor core during the plastic coating process can be discharged in time through the exhaust grooves, thereby effectively preventing the accumulation of trapped air in the plastic coating area and causing the plastic coating area to collapse, thus ensuring the plastic coating quality of the motor core surface. Attached Figure Description

[0011] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0012] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0013] Figure 2 This is a schematic diagram of the molding die described in this utility model.

[0014] Figure 3 This is a schematic diagram of the structure of the molding mold after the upper mold is removed.

[0015] Figure 4 This is a schematic diagram of the structure of the molding mold after the upper and lower mold layers are removed.

[0016] Figure 5 yes Figure 4 A magnified structural diagram of point A in the middle.

[0017] Figure 6 This is a bottom view of the mold core described in this utility model.

[0018] In the diagram: 1. Upper mold body, 2. Lower mold body, 3. Middle mold body, 4. Molding mold, 4-1. Upper layer mold, 4-2. Middle layer mold, 4-3. Lower layer mold, 5. Motor core, 5-1. Plastic coating area, 6. Cavity, 7. Injection runner, 8. Insert, 9. Venting groove, 9-1. Main air groove, 9-2. Support air groove, 10. Mold core, 10-1. Center hole, 10-2. Arc-shaped runner, 11. Push plate, 12. Ejector pin. Detailed Implementation

[0019] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the present invention, and therefore only show the components relevant to the present invention.

[0020] like Figures 1-6 The illustrated brushless motor core plastic coating mold has an upper mold body 1, a lower mold body 2, and an intermediate mold body 3 disposed between the upper mold body 1 and the lower mold body 2. The intermediate mold body 3 is provided with a forming mold 4. The forming mold 4 includes an upper mold 4-1, a middle mold 4-2, and a lower mold 4-3. The upper mold 4-1, the middle mold 4-2, and the lower mold 4-3 form a cavity 6. The motor core 5 to be plastic coated is disposed in the cavity 6. A mold core 10 is provided at the center of the cavity 6. An injection flow channel 7 is provided between the upper mold body 1 and the cavity 6 of the forming mold 4.

[0021] The motor core 5 has four plastic-coated areas 5-1 evenly distributed around its circumference. The mold core 10 has a central hole 10-1 at its center. The bottom surface of the mold core 10 has four arc-shaped flow channels 10-2 corresponding to the four plastic-coated areas 5-1. The injection flow channel 7 is connected to the upper end of the central hole 10-1, and the lower end of the central hole 10-1 is connected to the arc-shaped flow channel 10-2.

[0022] Two spaced inserts 8 are positioned in the cavity 6 of each plastic-coated area 5-1. The lower ends of the two inserts 8 in each plastic-coated area 5-1 are embedded in the motor core 5, and the upper ends of the two inserts 8 are engaged with the upper end of the cavity 6. An exhaust groove 9 is provided on the outer surface of the inserts 8.

[0023] The exhaust groove 9 includes a main air groove 9-1 located on the upper part of the insert 8. The lower end of the main air groove 9-1 is connected to a branch air groove 9-2 corresponding to the inner and outer sides of the motor core 5. The branch air groove 9-2 is connected to the plastic-coated area 5-1 on the inner and outer sides of the motor core 5.

[0024] The preferred diameter of the exhaust groove 9 is 1.8 mm.

[0025] A push plate 11 is installed between the two side plates of the lower mold body 2. The push plate 11 is provided with a push rod 12 that can push out the plastic-coated motor core 5.

[0026] During the coating process, molten PPS GF40 enters the coating mold through the injection runner 7. The molten liquid flows through the central hole 10-1 of the mold core 10 into the arc-shaped runner 10-2 and then flows to the four coating areas 5-1 to coat the surface of the motor core 5. During this process, the trapped air generated by the molten PPS GF40 on the surface of the motor core 5 can be discharged in time through the venting groove 9, which can effectively prevent the trapped air accumulated in the coating area 5-1 from collapsing and ensure the coating quality of the motor core 5.

[0027] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A plastic mold for encapsulating a brushless motor core, comprising an upper mold body (1), a lower mold body (2), and an intermediate mold body (3) disposed between the upper mold body (1) and the lower mold body (2), characterized in that: The intermediate mold (3) is provided with a molding mold (4). The molding mold (4) has a cavity (6) for placing the motor core (5) to be coated. An injection flow channel (7) is provided between the upper mold (1) and the cavity (6) of the molding mold (4). The motor core (5) has four coating areas (5-1) evenly distributed around its circumference. Two inserts (8) are positioned in the cavity (6) of each coating area (5-1). The lower ends of the two inserts (8) in each coating area (5-1) are embedded in the motor core (5). The upper ends of the two inserts (8) are matched with the upper end of the cavity (6). An exhaust groove (9) is provided on the outer surface of the insert (8).

2. The plastic molding for brushless motor core as described in claim 1, characterized in that: The diameter of the exhaust groove (9) is 1.5 to 2 mm.

3. The plastic molding for brushless motor core as described in claim 2, characterized in that: The exhaust groove (9) includes a main air groove (9-1) located on the upper part of the insert (8). The lower end of the main air groove (9-1) is connected to a branch air groove (9-2) corresponding to the inner and outer sides of the motor core (5). The branch air groove (9-2) is connected to the plastic-coated area (5-1) on the inner and outer sides of the motor core (5).

4. The plastic molding for brushless motor core as described in claim 1, characterized in that: The molding mold (4) includes an upper mold (4-1), a middle mold (4-2) and a lower mold (4-3). The upper mold (4-1) is provided with a mold core (10). The mold core (10) has a central hole (10-1) at its center. The bottom surface of the mold core (10) has four arc-shaped flow channels (10-2) corresponding to the four plastic coating areas (5-1). The injection flow channel (7) is connected to the upper end of the central hole (10-1), and the lower end of the central hole (10-1) is connected to the arc-shaped flow channel (10-2).

5. The plastic molding for brushless motor core as described in claim 1, characterized in that: The lower mold body (2) is equipped with a push plate (11), and the push plate (11) is provided with a push rod (12) that can push out the plastic-coated motor core (5).

Images