Transformer injection molding packaging mold

Abstract

The utility model discloses a transformer injection molding packaging mold, and belongs to the technical field of transformer production. The mold comprises an upper mold and a lower mold, a plurality of upper shell cavity grooves are formed in the bottom of the upper mold, upper mold exhaust grooves are formed in the bottom of the upper mold, the upper mold exhaust grooves are communicated with the upper shell cavity grooves, injection molding blind holes are formed in the bottom of the upper mold, the injection molding blind holes are communicated with the upper shell cavity grooves through upper mold injection molding runners, and the upper mold exhaust grooves are communicated with the lower mold exhaust grooves. A lower shell cavity groove is formed in the position, corresponding to the upper shell cavity groove, of the top of the lower mold, a lower mold exhaust groove is formed in the position, corresponding to the upper mold exhaust groove, of the top of the lower mold, and an injection molding hole is formed in the position, corresponding to the injection molding blind hole, of the lower mold. And the lower mold is provided with a lower mold injection molding runner which is communicated with the upper mold injection molding runner and the lower shell cavity groove. During injection molding packaging, epoxy resin is injected into the upper shell cavity groove and the lower shell cavity groove at the same time, and exhaust is conducted in time, so that it is guaranteed that epoxy resin is densely filled, and the packaging quality of the transformer is guaranteed.

Description

Technical Field

[0001] The utility model relates to a transformer injection packaging mold, belonging to the technical field of transformer production. Background Art

[0002] The rapid development of the electronics industry toward miniaturization, integration, high frequency, and high reliability has placed higher demands on the electronic components used. Low-power pulse transformers are being required not only to have improved functionality but also to be compact. For example, low-leakage inductance plastic-encapsulated drive transformers require injection molding to ensure the lifespan and quality of the core and wire wrap, ensuring high reliability.

[0003] Chinese patent publication CN101593620 discloses a method for packaging electronic transformer cores. The metal forming mold employed is a split mold composed of a front mold plate, a rear mold plate, and multiple screw locks. Multiple linearly arranged recesses are punched into the front and rear mold plates, forming cavities precisely accommodating the high-voltage and low-voltage coils of the transformer core. A spacer is placed between adjacent transformer cores. Using a metal forming mold for curing overcomes the drawback of traditional packaging, where the epoxy resin is heated simultaneously with the plastic housing, preventing the epoxy resin from curing at a reasonable temperature due to the plastic housing's temperature resistance. Heat treatment can be performed according to the epoxy resin's curing temperature, resulting in a more complete cure and significantly reducing heating time and energy consumption.

[0004] However, while the cavity on the mold accommodates the high-voltage coil and low-voltage coil of the transformer core, a certain amount of air is also filled in the cavity. During the potting process, the air in the cavity is compressed and the air pressure increases, which will eventually cause the epoxy resin to be filled loosely in the cavity, seriously affecting the packaging quality of the electronic transformer core. Utility Model Content

[0005] In order to solve the above technical problems, the utility model provides a transformer injection packaging mold.

[0006] The utility model is achieved through the following technical solutions:

[0007] A transformer injection packaging mold includes an upper mold and a lower mold, wherein the bottom of the upper mold is provided with a plurality of upper shell cavities, the bottom of the upper mold is provided with an upper mold exhaust groove, and the upper mold exhaust groove is connected to the upper shell cavity, the bottom of the upper mold is provided with an injection blind hole, and the injection blind hole is connected to the upper shell cavity through the upper mold injection flow channel, the top of the lower mold is provided with a lower shell cavity at a position corresponding to the upper shell cavity, the top of the lower mold is provided with a lower mold exhaust groove at a position corresponding to the upper mold exhaust groove, the lower mold is provided with an injection hole at a position corresponding to the injection blind hole, and the lower mold is provided with a lower mold injection flow channel connecting the upper mold injection flow channel and the lower shell cavity.

[0008] The upper mold comprises an upper mold frame, an upper mold box and an upper mold cavity, and the upper mold cavity is installed on the bottom of the upper mold frame through the upper mold box.

[0009] The upper mold box is detachably connected to the upper mold frame. The upper mold box is provided with multiple upper mold positioning holes. The upper mold cavity is provided with upper mold threaded holes at positions corresponding to the upper mold positioning holes. The upper mold cavity is connected to the upper mold box through upper mold screws.

[0010] An even number of upper shell cavity grooves are formed at the bottom of the upper mold cavity.

[0011] The upper shell cavity is in the shape of a cuboid with an open bottom, and three side surfaces of the upper shell cavity are connected to upper mold exhaust grooves.

[0012] An even number of upper shell cavities are divided into a group of two, and the upper mold injection runner includes a first upper mold injection runner and a second upper mold injection runner. The second upper mold injection runner connects the two upper shell cavities in the same group, and the second upper mold injection runner is connected to the injection blind hole through the first upper mold injection runner.

[0013] The lower mold comprises a lower mold frame, a lower mold box and a lower mold cavity, and the lower mold cavity is installed on the top of the lower mold frame through the lower mold box.

[0014] The lower mold box is detachably connected to the lower mold frame. The lower mold box is provided with multiple lower mold positioning holes. The lower mold cavity is provided with lower mold threaded holes at positions corresponding to the lower mold positioning holes. The lower mold cavity is connected to the lower mold box through lower mold screws.

[0015] A plurality of lower shell cavities are provided on the top of the lower mold cavity, and every two lower shell cavities are divided into a group. The lower mold injection runner includes a first lower mold injection runner, and the first lower mold injection runner is connected to the two lower shell cavities in the same group. The position of the first lower mold injection runner is opposite to the position of the second upper mold injection runner, and is connected to the second upper mold injection runner.

[0016] The beneficial effects of the utility model are as follows: during the injection molding packaging process of the transformer, on the one hand, epoxy resin is injected into the gap between the transformer and the upper shell cavity groove and the gap between the transformer and the lower shell cavity groove; on the other hand, the air in the cavity surrounded by the upper shell cavity groove and the lower shell cavity groove can be discharged in time through the exhaust channel surrounded by the upper mold exhaust groove and the lower mold exhaust groove, thereby ensuring that the epoxy resin is densely filled and the packaging quality of the transformer is guaranteed. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic structural diagram of the upper mold of the present utility model;

[0018] Figure 2 for Figure 1 Left view of;

[0019] Figure 3 This is a schematic structural diagram of the upper mold cavity of the present utility model;

[0020] Figure 4 This is a schematic structural diagram of the lower mold of the present utility model;

[0021] Figure 5 for Figure 4 Left view of;

[0022] Figure 6 It is a structural schematic diagram of the lower mold cavity of the present utility model.

[0023] In the figure: 1-upper mold, 10-upper shell cavity, 11-injection blind hole, 12-first upper mold injection flow channel, 13-upper mold positioning hole, 14-upper mold frame, 15-upper mold box, 16-upper mold cavity, 17-upper mold screw, 18-upper mold exhaust groove, 19-second upper mold injection flow channel;

[0024] 2-lower mold, 20-injection hole, 21-lower shell cavity, 22-lower mold frame, 23-lower mold box, 24-lower mold cavity, 25-lower mold screw, 26-first lower mold injection flow channel, 27-lower mold exhaust groove, 28-lower mold positioning hole. DETAILED DESCRIPTION

[0025] The technical solution of the present invention is further described below, but the scope of protection claimed is not limited to the described solution.

[0026] like Figures 1 to 6As shown, a transformer injection packaging mold described in the present invention includes an upper mold 1 and a lower mold 2. The bottom of the upper mold 1 is provided with a plurality of upper shell cavities 10, and the bottom of the upper mold 1 is processed with an upper mold exhaust groove 18, and the upper mold exhaust groove 18 is connected to the upper shell cavity 10. The bottom of the upper mold 1 is processed with an injection blind hole 11, and the injection blind hole 11 is connected to the upper shell cavity 10 through the upper mold injection runner. The top of the lower mold 2 is provided with a lower shell cavity 21 at a position corresponding to the upper shell cavity 10, and the top of the lower mold 2 is processed with a lower mold exhaust groove 27 at a position corresponding to the upper mold exhaust groove 18. The lower mold 2 is processed with an injection hole 20 at a position corresponding to the injection blind hole 11, and the lower mold 2 is processed with a lower mold injection runner connecting the upper mold injection runner and the lower shell cavity 21. In the open mold state, the transformer to be injection molded and encapsulated is placed in the lower shell cavity 21, and then the mold is closed so that the transformer is located in the cavity surrounded by the upper shell cavity 10 and the lower shell cavity 21. Epoxy resin is injected through the injection hole 20, and the epoxy resin flows into the gap between the upper shell cavity 10 and the transformer through the injection blind hole 11 and the upper mold injection flow channel, and flows into the gap between the lower shell cavity 21 and the transformer through the injection blind hole 11, the upper mold injection flow channel and the lower mold injection flow channel. The air in the cavity surrounded by the upper shell cavity 10 and the lower shell cavity 21 is discharged through the exhaust channel surrounded by the upper mold exhaust groove 18 and the lower mold exhaust groove 27, thereby ensuring that the epoxy resin is densely filled and the packaging quality of the transformer is guaranteed.

[0027] The upper mold 1 includes an upper mold frame 14 , an upper mold box 15 and an upper mold cavity 16 . The upper mold cavity 16 is installed at the bottom of the upper mold frame 14 through the upper mold box 15 .

[0028] The upper mold box 15 is detachably connected to the upper mold frame 14. Multiple upper mold positioning holes 13 are machined into the upper mold box 15. Upper mold cavity 16 is provided with upper mold threaded holes at positions corresponding to the upper mold positioning holes 13. Upper mold cavity 16 is connected to the upper mold box 15 via upper mold screws 17. During use, the upper mold box 15 is screwed to the upper mold frame 14. One end of the upper mold screw 17 passes through the upper mold positioning holes 13 and connects to the upper mold threaded hole, thereby attaching the upper mold cavity 16 to the upper mold box 15.

[0029] An even number of upper shell cavity grooves 10 are defined at the bottom of the upper mold cavity 16 .

[0030] The upper shell cavity 10 is in the shape of a cuboid with an open bottom, and three side surfaces of the upper shell cavity 10 are connected to upper mold exhaust grooves 18 .

[0031] An even number of upper shell cavities 10 are grouped into two groups, and the upper mold injection flow channel includes a first upper mold injection flow channel 12 and a second upper mold injection flow channel 19. The second upper mold injection flow channel 19 connects the two upper shell cavities 10 in the same group, and the second upper mold injection flow channel 19 is connected to the injection blind hole 11 through the first upper mold injection flow channel 12. Figure 1 As shown, one injection blind hole 11 can be connected to six second upper mold injection channels 19 through the first upper mold injection channel 12 respectively, and epoxy resin can be supplied to 12 upper shell cavities 10 at the same time. The number of injection blind holes 11 is determined according to the number of upper shell cavities 10 at the bottom of the upper mold cavity 16.

[0032] The lower mold 2 includes a lower mold frame 22 , a lower mold box 23 and a lower mold cavity 24 . The lower mold cavity 24 is installed on the top of the lower mold frame 22 through the lower mold box 23 .

[0033] The lower mold box 23 is detachably connected to the lower mold frame 22. Multiple lower mold positioning holes 28 are machined into the lower mold box 23. Lower mold cavity 24 is machined with lower mold threaded holes at positions corresponding to the lower mold positioning holes 28. Lower mold cavity 24 is connected to the lower mold box 23 via lower mold screws 25. During use, the lower mold box 23 is screwed to the lower mold frame 22. One end of the lower mold screw 25 passes through the lower mold positioning holes 28 and connects to the lower mold threaded hole, thereby attaching the lower mold cavity 24 to the lower mold box 23.

[0034] The top of the lower mold cavity 24 is processed with multiple lower shell cavities 21, and every two lower shell cavities 21 are divided into a group. The lower mold injection runner includes a first lower mold injection runner 26, and the first lower mold injection runner 26 connects the two lower shell cavities 21 in the same group. The position of the first lower mold injection runner 26 is opposite to the position of the second upper mold injection runner 19, and is connected to the second upper mold injection runner 19.

[0035] Specifically, in the open mold state, the transformer to be injection molded and encapsulated is placed in the lower shell cavity 21, and then the mold is closed so that the transformer is located in the cavity surrounded by the upper shell cavity 10 and the lower shell cavity 21, and epoxy resin is injected through the injection hole 20. The epoxy resin flows into the gap between the upper shell cavity 10 and the transformer through the injection blind hole 11, the first upper mold injection flow channel 12 and the second upper mold injection flow channel 19. At the same time, the epoxy resin in the second upper mold injection flow channel 19 flows into the gap between the lower shell cavity 21 and the transformer through the first lower mold injection flow channel 26. The air in the cavity surrounded by the upper shell cavity 10 and the lower shell cavity 21 is discharged through the exhaust channel surrounded by the upper mold exhaust groove 18 and the lower mold exhaust groove 27, thereby ensuring that the epoxy resin is densely filled and the packaging quality of the transformer is guaranteed.

Claims

1. A transformer injection packaging mold, characterized in that: The invention comprises an upper mold (1) and a lower mold (2); a plurality of upper shell cavity grooves (10) are provided at the bottom of the upper mold (1); an upper mold exhaust groove (18) is provided at the bottom of the upper mold (1), and the upper mold exhaust groove (18) is connected to the upper shell cavity groove (10); an injection blind hole (11) is provided at the bottom of the upper mold (1); the injection blind hole (11) is connected to the upper shell cavity groove (10) through an upper mold injection flow channel; a lower shell cavity groove (21) is provided at the top of the lower mold (2) at a position corresponding to the upper shell cavity groove (10); a lower mold exhaust groove (27) is provided at the top of the lower mold (2) at a position corresponding to the upper mold exhaust groove (18); an injection hole (20) is provided on the lower mold (2) at a position corresponding to the injection blind hole (11); and a lower mold injection flow channel is provided on the lower mold (2) to connect the upper mold injection flow channel and the lower shell cavity groove (21).

2. The transformer injection molding mold according to claim 1, characterized in that: The upper mold (1) comprises an upper mold frame (14), an upper mold box (15) and an upper mold cavity (16); the upper mold cavity (16) is installed at the bottom of the upper mold frame (14) through the upper mold box (15).

3. The transformer injection molding mold according to claim 2, characterized in that: The upper mold box (15) is detachably connected to the upper mold frame (14); a plurality of upper mold positioning holes (13) are provided on the upper mold box (15); upper mold threaded holes are provided on the upper mold cavity (16) at positions corresponding to the upper mold positioning holes (13); and the upper mold cavity (16) is connected to the upper mold box (15) via upper mold screws (17).

4. The transformer injection molding mold according to claim 2, characterized in that: An even number of upper shell cavity grooves (10) are formed at the bottom of the upper mold cavity (16).

5. The transformer injection packaging mold according to claim 4, characterized in that: The upper shell cavity (10) is in the shape of a rectangular parallelepiped with an opening at the bottom, and three side surfaces of the upper shell cavity (10) are connected to upper die exhaust grooves (18).

6. The transformer injection packaging mold according to claim 4, characterized in that: An even number of the upper shell cavity grooves (10) are grouped into two groups, and the upper mold injection flow channel comprises a first upper mold injection flow channel (12) and a second upper mold injection flow channel (19). The second upper mold injection flow channel (19) is connected to the two upper shell cavity grooves (10) in the same group, and the second upper mold injection flow channel (19) is connected to the injection blind hole (11) through the first upper mold injection flow channel (12).

7. The transformer injection packaging mold according to claim 6, characterized in that: The lower mold (2) comprises a lower mold frame (22), a lower mold box (23) and a lower mold cavity (24), and the lower mold cavity (24) is installed on the top of the lower mold frame (22) through the lower mold box (23).

8. The transformer injection packaging mold according to claim 7, characterized in that: The lower mold box (23) is detachably connected to the lower mold frame (22); a plurality of lower mold positioning holes (28) are provided on the lower mold box (23); lower mold threaded holes are provided on the lower mold cavity (24) at positions corresponding to the lower mold positioning holes (28); and the lower mold cavity (24) is connected to the lower mold box (23) via lower mold screws (25).

9. The transformer injection packaging mold according to claim 7, characterized in that: The top of the lower mold cavity (24) is provided with a plurality of lower shell cavity grooves (21), and every two lower shell cavity grooves (21) form a group. The lower mold injection flow channel comprises a first lower mold injection flow channel (26), and the first lower mold injection flow channel (26) is connected to the two lower shell cavity grooves (21) in the same group. The position of the first lower mold injection flow channel (26) is opposite to the position of the second upper mold injection flow channel (19), and is connected to the second upper mold injection flow channel (19).

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