CN216632267U

CN216632267U - Concave aluminum electrolytic capacitor shell and forming die thereof

Info

Publication number: CN216632267U
Application number: CN202120704411.4U
Authority: CN
Inventors: 艾亮; 徐勋安; 潘振炎
Original assignee: Hunan Aihua Group Co Ltd
Current assignee: Hunan Aihua Group Co Ltd
Priority date: 2021-04-07
Filing date: 2021-04-07
Publication date: 2022-05-31
Anticipated expiration: 2031-04-07

Abstract

The application discloses an inwards concave aluminum electrolytic capacitor shell and a forming die thereof. The concave aluminum electrolytic capacitor shell is cuboid or cylindrical, and the bottom of the shell is concave inwards to form a boss inside the shell. In the utility model, the bottom of the shell of the aluminum electrolytic capacitor is inwards sunken to enhance the strength of the bottom of the shell to a certain extent; meanwhile, when the aluminum electrolytic capacitor generates a small amount of gas during aging, the concave part at the bottom of the shell is firstly pushed outwards, rather than the bottom of the shell is directly bulged.

Description

Concave aluminum electrolytic capacitor shell and forming die thereof

Technical Field

The utility model relates to an aluminum electrolytic capacitor, in particular to an inwards concave aluminum electrolytic capacitor shell and a forming die thereof.

Background

The shell of the existing aluminum electrolytic capacitor is generally an aluminum shell, the shape of the shell is generally a cylinder, and a small part of the shell is a cuboid. The conventional aluminum electrolytic capacitor has a case as shown in fig. 1, which is flat at the bottom and is then provided with an explosion-proof tank. However, in the production, the volume ratio of products with larger aluminum shells, particularly products with the diameter of more than 13mm, is higher, and the products are easy to generate bad drum tops after aging, and are called as bulges in the industry; this is because electrolysis is very likely to occur during aging to generate gas. The bulge product is to be scrapped after being detected by the appearance, and actually the electrical property of the bulge product is also in accordance with the requirement, only the appearance is not in accordance with the requirement, and the direct scrapping is a waste.

SUMMERY OF THE UTILITY MODEL

The technical problem to be solved by the utility model is to overcome the defects of the prior art and provide the shell of the aluminum electrolytic capacitor, which can solve the problem that the traditional aluminum electrolytic capacitor slightly bulges, thereby improving the yield of a production line.

In order to solve the technical problems, the technical scheme provided by the utility model is as follows: an inwards-concave shell of an aluminum electrolytic capacitor is rectangular or cylindrical, and the bottom of the shell is inwards concave to form a boss inside the shell.

Preferably, the inward-recessed depth of the bottom of the casing is 0.5-2 mm.

In the above-mentioned recessed aluminum electrolytic capacitor case, preferably, an explosion-proof groove is formed on the inner side or the outer side of the boss.

Preferably, a buffering surface is formed between the boss and the bottom of the casing, and an arc shape is formed between the buffering surface and the boss.

A forming die of an inwards concave aluminum electrolytic capacitor shell comprises an upper die and a lower die; a supporting table surface of a shell is formed at the top of the lower die, and the middle part of the supporting table surface is sunken downwards; the lower die is downwards sunken to form a sunken bottom surface, the periphery of the sunken bottom surface is a side surface, and the joint between the side surface and the sunken bottom surface is designed into an arc shape; the upper die protrudes downwards, and the downward protruding position of the upper die corresponds to the downward recessed position of the lower die; and the shape of the downward projection of the upper die matches the shape of the downward depression of the lower die.

In the above concave aluminum electrolytic capacitor shell forming die, preferably, the downwardly convex surface of the upper die is provided with a convex strip for punching the explosion-proof groove.

In the above concave aluminum electrolytic capacitor shell forming mold, preferably, a positioning block is formed at one side of the lower mold, and a pushing block is arranged at the side edge of the positioning block; the positioning block is fan-shaped, and the radian of the fan-shaped is the same as that of the inside of the cylindrical shell; the shape of the push block is matched with that of the positioning block.

In the above concave aluminum electrolytic capacitor shell forming mold, preferably, a positioning block is formed at one side of the lower mold, and a pushing block is arranged at the side edge of the positioning block; the locating piece is rectangular, and the width of locating piece is the same with the inside width of square shell.

Compared with the prior art, the utility model has the advantages that: in the utility model, the bottom of the shell of the aluminum electrolytic capacitor is inwards sunken to enhance the strength of the bottom of the shell to a certain extent; meanwhile, when the aluminum electrolytic capacitor generates a small amount of gas during aging, the concave part at the bottom of the shell is firstly pushed outwards, rather than the bottom of the shell is directly bulged.

Drawings

Fig. 1 is a schematic structural diagram of a conventional aluminum electrolytic capacitor case in the background art.

Fig. 2 is a schematic structural view of the housing in embodiment 1.

Fig. 3 is a schematic structural view of the housing on the molding die in embodiment 1.

Fig. 4 is an enlarged schematic view of the structure at a in fig. 3.

Fig. 5 is a schematic structural view of an upper die in embodiment 1.

Fig. 6 is a schematic structural view of a lower die in embodiment 1.

Fig. 7 is a schematic structural view of an upper die in embodiment 2.

Fig. 8 is a schematic structural view of a lower die in embodiment 2.

Description of the figures

1. A boss; 2. a buffer surface; 3. an upper die; 31. a protrusion; 32. an explosion-proof groove; 4. a lower die; 41. supporting the table top; 42. a recessed bottom surface; 43. a side surface; 44. positioning blocks; 5. and (7) pushing the block.

Detailed Description

In order to facilitate an understanding of the utility model, the utility model will be described more fully and in detail below with reference to the accompanying drawings and preferred embodiments, but the scope of the utility model is not limited to the specific embodiments below.

It should be particularly noted that when an element is referred to as being "fixed to, connected to or communicated with" another element, it can be directly fixed to, connected to or communicated with the other element or indirectly fixed to, connected to or communicated with the other element through other intermediate connecting components.

Unless otherwise defined, all terms of art used hereinafter have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of the present invention.

Example 1

As shown in fig. 2, the concave aluminum electrolytic capacitor shell is cylindrical, and the bottom of the shell is concave inwards to form a boss 1 inside the shell; an explosion-proof groove 32 is formed on the outer side of the boss 1. The depth of the inward recess at the bottom of the shell is 1 mm. In the present embodiment, the explosion-proof groove 32 is provided on the boss 1, and the function of the explosion-proof groove 32 is not affected.

In this embodiment, a buffer surface 2 is formed between the boss 1 and the bottom of the housing, and an arc shape is formed between the buffer surface 2 and the boss 1. The core bag is directly placed on the boss 1, the boss 1 is a plane in the embodiment, if the edge of the plane is a fracture, mechanical damage is easily caused to the bottom of the core bag, and therefore a short circuit is caused, and therefore an arc shape is formed between the buffer surface 2 and the boss 1 in the embodiment. In other embodiments, the shape of the recess in the bottom of the shell can be set into a circular arch shape directly; namely, the bottom of the shell is inwards sunken to form a circular arch boss 1.

In the embodiment, the bottom of the shell of the aluminum electrolytic capacitor is inwards sunken to a certain extent, so that the strength of the bottom of the shell can be enhanced; meanwhile, when the aluminum electrolytic capacitor generates a small amount of gas during aging, the concave part at the bottom of the shell is firstly pushed outwards instead of directly causing the bottom of the shell to bulge, so that the yield of the production line is improved. Meanwhile, the improvement of the housing in the embodiment does not affect the normal operation of the explosion-proof slot 32.

The embodiment also provides a concave forming die of the aluminum electrolytic capacitor shell, which comprises an upper die 3 and a lower die 4; a supporting table 41 of a shell is formed at the top of the lower die 4, and the middle part of the supporting table 41 is sunken downwards; the lower die 4 is recessed downwards to form a recessed bottom 42, the periphery of the recessed bottom 42 is a side 43, and the joint between the side 43 and the recessed bottom 42 is designed into an arc shape. The upper die 3 protrudes downward to form a protruding part 31, and the position of the downward protrusion of the upper die 3 corresponds to the position of the downward depression of the lower die 4; and the downwardly convex shape of the upper die 3 matches the downwardly concave shape of the lower die 4. In fact, in this embodiment, the lower die 4 acts as a support shell, and in operation the upper die 3 presses the bottom of the conventional shell against the lower die 4 to form a boss 1 inwardly in the bottom of the shell. The lower die 4 and the upper die 3 are correspondingly shaped, each corresponding to the shape of the boss 1 to be formed. When the aluminum electrolytic capacitor works, a shell of a traditional aluminum electrolytic capacitor is firstly placed on the lower die 4, and the upper die 3 is pressed downwards after positioning, so that the bottom of the shell is inwards sunken to form a boss 1. Because the convex strip for punching the explosion-proof groove 32 is arranged on the downward convex surface of the upper die 3, the explosion-proof groove 32 is formed on the boss 1 when the upper die 3 is extruded downwards.

In the embodiment, a positioning block 44 is formed on one side of the lower die 4, and a pushing block 5 is arranged on the side edge of the positioning block 44; the positioning block 44 is in a sector shape, and the radian of the sector shape is the same as that of the inside of the cylindrical shell; the shape of the push block 5 matches the shape of the positioning block 44. In the embodiment, since the housing is cylindrical, after the housing is placed on the lower mold 4, the housing can be positioned by only abutting one side of the housing against the lower mold 4; however, in order to position the center of the bottom of the housing at the time of positioning to correspond to the center of the lower mold 4, in this embodiment, a positioning block 44 is provided on one side of the lower mold 4; the ejector 5 thus completes the positioning of the housing after pushing it against the positioning block 44 on the lower die 4, while a larger clearance exists between the other side of the lower die 4 and the housing, so that the housing can be easily placed on the lower die 4.

Example 2

In this embodiment, a mold for forming a bottom portion of a rectangular parallelepiped case is provided, and the structure is the same as that of the mold in embodiment 1, but in this embodiment, the mold is a square case, and therefore, the lower mold 4 and the upper mold 3 are also changed to have a rectangular shape. In this embodiment, there are some differences in the positioning structure; a positioning block 44 is formed on one side of the lower die 4, and a push block 5 is arranged on the side edge of the positioning block 44; the positioning block 44 has a rectangular shape, and the width of the positioning block 44 is the same as the width of the inside of the square housing. In this embodiment, the positioning block 44 has the same width as the square housing, but it is ensured that the housing can be smoothly placed on the lower mold 4, that is, the lower mold 4 can smoothly extend into the housing. During positioning, the pushing block 5 is only required to move the side of the shell close to the pushing block 5 to abut against the positioning block 44 on the lower die 4 to complete the positioning of the shell.

Claims

1. An internal concave aluminum electrolytic capacitor shell is characterized in that: the shell is cuboid or cylindrical, and the bottom of the shell is inwards sunken to form a boss inside the shell.

2. The recessed aluminum electrolytic capacitor case of claim 1, wherein: the depth of the inward recess at the bottom of the shell is 0.5-2 mm.

3. The recessed aluminum electrolytic capacitor case of claim 1, wherein: an explosion-proof groove is formed on the inner side or the outer side of the boss.

4. The recessed aluminum electrolytic capacitor case of claim 1, wherein: a buffering surface is formed between the boss and the bottom of the shell, and an arc shape is formed between the buffering surface and the boss.

5. An indent forming die for an aluminum electrolytic capacitor shell is characterized in that: comprises an upper die and a lower die; a supporting table surface of a shell is formed at the top of the lower die, and the middle of the supporting table surface is sunken downwards; the lower die is downwards sunken to form a sunken bottom surface, the periphery of the sunken bottom surface is a side surface, and the joint between the side surface and the sunken bottom surface is designed into an arc shape; the upper die protrudes downwards, and the downward protruding position of the upper die corresponds to the downward recessed position of the lower die; and the downwardly convex shape of the upper die matches the downwardly concave shape of the lower die.

6. The female aluminum electrolytic capacitor shell forming die of claim 5, characterized in that: and a raised line for punching the explosion-proof groove is arranged on the surface of the downward bulge of the upper die.

7. The female aluminum electrolytic capacitor shell forming die of claim 5, characterized in that: a positioning block is formed on one side of the lower die, and a pushing block is arranged on the side edge of the positioning block; the positioning block is fan-shaped, and the radian of the fan-shaped is the same as that of the inside of the cylindrical shell; the shape of the push block is matched with that of the positioning block.

8. The female aluminum electrolytic capacitor shell forming die of claim 5, characterized in that: a positioning block is formed on one side of the lower die, and a pushing block is arranged on the side edge of the positioning block; the locating piece is rectangular, and the width of locating piece is the same with the inside width of square shell.