A large-capacity long-life bolt-type aluminum electrolytic capacitor

Abstract

The utility model belongs to the technical field of aluminum electrolytic capacitor, and disclose a big capacity long life's bolt type aluminum electrolytic capacitor, including the shell body, the top of shell body is connected with the end cover body, is provided with elastic component and limit component respectively on the shell body, the inside of shell body is connected with aluminum core package body, the inside of end cover body is connected with two screw pieces, the surface of two screw pieces all is connected with the welding spot. The utility model discloses a plurality of flow guide holes is arranged on the limiting board, and the flow channel formed by flow guide hole is beneficial to make the aluminum core package body be fully infiltrated, and the stability of the overall capacity of shell body is assisted to improve, avoids appearing the situation that electrolyte can not infiltrate aluminum core package body, and the bubble discharge is assisted to speed up through the flow guide hole of uniform arrangement, because the common reason of the low initial capacity is that bubble remains, and therefore setting flow guide hole is more beneficial to reduce the overall initial capacity attenuation of aluminum core package body.

Description

Technical Field

[0001] This utility model belongs to the technical field of aluminum electrolytic capacitors, specifically a bolt-type aluminum electrolytic capacitor with large capacity and long life. Background Technology

[0002] Two conductors placed close together, with a non-conductive insulating medium sandwiched between them, constitute a capacitor. When a voltage is applied between the two plates of a capacitor, the capacitor stores charge. The capacitance of a capacitor is numerically equal to the ratio of the charge on one conductive plate to the voltage between the two plates. The basic unit of capacitance is the farad, which is usually represented by the letter C in circuit diagrams. Capacitors play an important role in circuits such as tuning, bypassing, coupling, and filtering. They are used in the tuning circuit of transistor radios, as well as in the coupling and bypass circuits of color televisions.

[0003] Meanwhile, a bolt-type aluminum electrolytic capacitor with application number CN202122041475.3 includes a main shell, an mounting plate movably embedded inside the main shell, a support plate movably embedded above the mounting plate inside the main shell, a second lead movably embedded on the upper surface of the support plate, a connecting seat movably embedded on the upper surface of the mounting plate, a disassembly groove on the upper surface of the main shell, a core movably mounted inside the main shell, a first lead fixedly embedded at the upper end of the core, a connecting seat passing through the mounting plate and movably connected to the first lead, a second lead passing through the support plate and movably connected to the connecting seat, and a limit rod fixedly mounted on the lower surface of the support plate.

[0004] However, the following problems were found in the implementation of the relevant technology: Traditional glue fixing methods have problems such as high-temperature aging and cracking leading to loosening of the core, and glue penetration into the electrolytic paper affecting electrolyte wetting. If high-temperature aging causes the core to fail to limit its position, the lifespan will be much shorter than the entire lifespan of the capacitor. The bolt-type aluminum electrolytic capacitor mentioned above has certain shortcomings. It has a movable core installed inside the shell, but the core is the core of the capacitor. If the core is only movable and lacks a limiting structure, the core may shift, loosen and fall off. Not only will the capacitor itself be completely scrapped, but it may also affect the entire circuit system through leakage current, short circuit, electrolyte corrosion and other issues, causing equipment losses far exceeding the value of the capacitor itself. Utility Model Content

[0005] To address the problems mentioned in the background art, this utility model provides a bolt-type aluminum electrolytic capacitor with large capacity and long lifespan. It has the advantages of conveniently limiting and fixing the aluminum core body and resisting vibration, as well as the advantages of assisting in increasing the overall initial capacity of the capacitor and extending its service life.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a high-capacity, long-life bolt-type aluminum electrolytic capacitor, comprising a housing, an end cap body connected to the top of the housing, an elastic component and a limiting component respectively provided on the housing, an aluminum core body connected to the inner side of the housing, two screw connectors connected to the inner side of the end cap body, welding points connected to the surfaces of the two screw connectors, strip-shaped guide foils connected to the bottom ends of the two welding points, and the bottom ends of the two strip-shaped guide foils connected to the top of the aluminum core body, and an explosion-proof valve connected to the surface of the end cap body;

[0007] The surface of the elastic component is connected to the inner side of the outer shell to drive the elastic component to extend and retract in the horizontal direction;

[0008] The surface of the limiting component is connected to the surface of the elastic component to drive the limiting component to move horizontally and limit the aluminum core package body.

[0009] Preferably, the elastic component includes eight limiting sleeves, all of which are disposed on the inner wall of the outer shell. Each limiting sleeve has a sliding rod slidably connected to its inner side, and an expansion spring is sleeved on the outer side of each limiting sleeve.

[0010] Preferably, each of the limiting sleeves and each of the sliding rods is made of 304 stainless steel, and each of the expansion springs is made of nickel-based high-temperature alloy.

[0011] Preferably, the limiting assembly includes four limiting plates, each of which is disposed at one end of every two sliding rods. An insulating pad is connected to one side of each of the four limiting plates, and a plurality of flow guiding holes are formed on the surface of each of the four limiting plates and the surface of each of the four insulating pads.

[0012] Preferably, the two ends of each pair of expansion springs are connected to the inner wall of the outer casing and the other side of each limiting plate, respectively.

[0013] Preferably, the limiting plate is made of polytetrafluoroethylene.

[0014] Preferably, the surfaces of all four insulating pads are in contact with the surface of the aluminum core package body.

[0015] Preferably, both of the screw connectors are made of high-purity electrolytic copper.

[0016] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0017] 1. This utility model uses the sliding action of the slide rod combined with the strong elastic pushing action of the expansion spring to drive the displacement of the limiting plate, which facilitates physical pressure limiting of the aluminum core package body and prevents the aluminum core package body from falling off. Moreover, it is safer than the traditional glue fixing method, with no risk of chemical aging, avoiding cracking, delamination, and other situations that could lead to loosening of the aluminum core package body, poor contact of the electrode tabs, and leakage. It does not react with electrolytes or aluminum foil, and has no negative impact on electrical performance. Furthermore, the elasticity of the expansion spring itself allows the aluminum core package body to expand and contract to adapt to the size of the aluminum core package body when there are certain dimensional fluctuations. Compared with the inelastic characteristics of glue curing, it is more conducive to compatibility with the size of the aluminum core package body.

[0018] 2. This utility model has several flow guide holes set on the limiting plate. The flow channels formed by the flow guide holes facilitate the full wetting of the aluminum core package body, which helps to improve the stability of the overall capacity of the outer shell and avoids the situation where the electrolyte cannot wet the aluminum core package body. In addition, the evenly distributed flow guide holes play an auxiliary role in accelerating the discharge of air bubbles. Since residual air bubbles are a common cause of low initial capacity, setting flow guide holes is more conducive to reducing the overall initial capacity decay. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0020] Figure 2 This is one of the cross-sectional structural schematic diagrams of this utility model;

[0021] Figure 3 This utility model Figure 2 A magnified structural diagram at point A;

[0022] Figure 4 This is the second cross-sectional structural schematic diagram of the present invention;

[0023] Figure 5 This utility model Figure 4 A magnified structural diagram at point B.

[0024] In the diagram: 1. Outer shell;

[0025] 2. Elastic component; 21. Limiting sleeve; 22. Slide rod; 23. Expansion spring;

[0026] 3. Limiting component; 31. Limiting plate; 32. Insulating pad; 33. Flow guide hole;

[0027] 4. End cap body; 5. Aluminum core package body; 6. Screw connector; 7. Explosion-proof valve; 8. Welding point; 9. Strip guide foil. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0029] like Figures 1 to 5 As shown, this utility model provides a high-capacity, long-life bolt-type aluminum electrolytic capacitor, including a housing 1, an end cap body 4 connected to the top of the housing 1, an elastic component 2 and a limiting component 3 respectively provided on the housing 1, an aluminum core body 5 connected to the inner side of the housing 1, two screw connectors 6 connected to the inner side of the end cap body 4, welding points 8 connected to the surface of the two screw connectors 6, strip-shaped guide foil strips 9 connected to the bottom of the two welding points 8, and the bottom of the two strip-shaped guide foil strips 9 connected to the top of the aluminum core body 5, and an explosion-proof valve 7 connected to the surface of the end cap body 4.

[0030] The surface of the elastic component 2 is connected to the inner side of the outer shell 1 to drive the elastic component 2 to extend and retract in the horizontal direction;

[0031] The surface of the limiting component 3 is connected to the surface of the elastic component 2 so as to drive the limiting component 3 to move horizontally to limit the aluminum core package body 5.

[0032] Specifically, the elastic component 2 includes eight limiting sleeves 21, all of which are set on the inner wall of the outer shell 1. Each limiting sleeve 21 has a sliding rod 22 slidably connected to its inner side, and an expansion spring 23 is sleeved on the outer side of each limiting sleeve 21 to facilitate the subsequent movement of the limiting plate 31 to fix the aluminum core package body 5.

[0033] Furthermore, each limiting sleeve 21 and each sliding rod 22 are made of 304 stainless steel, which is resistant to electrolyte corrosion, has sufficient rigidity, is easy to weld with the limiting plate 31 and the outer shell 1, and has a moderate cost. Each expansion spring 23 is made of nickel-based high-temperature alloy, which helps to improve durability.

[0034] Furthermore, the limiting component 3 includes four limiting plates 31, each of which is respectively set at one end of every two sliding rods 22, so as to limit the aluminum core package body 5. An insulating pad 32 is connected to one side of each of the four limiting plates 31. Several guide holes 33 are opened on the surface of the four limiting plates 31 and the surface of the four insulating pads 32. The guide holes 33 can serve as exhaust channels. During the standing stage after the electrolyte is filled, air can be discharged upward through the guide holes 33, which helps to reduce the air bubbles remaining between the aluminum core package body 5 and the limiting plates 31 and the insulating pads 32. Since air bubbles will occupy the electrolyte space, causing some aluminum foil to be unable to participate in the reaction and reducing the actual capacity, promoting the removal of air bubbles also helps to increase the actual capacity.

[0035] It is worth noting that the two ends of each pair of expansion springs 23 are connected to the inner wall of the outer shell 1 and the other side of each limiting plate 31, respectively, so as to facilitate a stable connection.

[0036] It is worth noting that the limiting plate 31 is made of polytetrafluoroethylene, which has the characteristics of high insulation, resistance to electrolyte swelling, and high temperature resistance.

[0037] It is worth mentioning that the surfaces of the four insulating pads 32 are all in contact with the surface of the aluminum core body 5, which facilitates the insulation function.

[0038] It is worth emphasizing that both screw connectors 6 are made of high-purity electrolytic copper, which helps to improve durability.

[0039] The limiting sleeve 21, limiting plate 31, and insulating pad 32 are existing technologies and will not be described in detail. Additionally, this utility model also includes a power supply, controller, and switch, which are not the main technical points of this patent and will not be described in detail. The "front, rear, left, and right" views of this device are... Figure 1 The direction shown in the diagram is the reference.

[0040] Working principle: First, the limiting plate 31 is pressed against the aluminum core package body 5 by the pushing action of the expansion spring 23, and an appropriate clamping force is generated on the aluminum core package body 5 to form a clamping force on the aluminum core package body 5, so as to prevent the aluminum core package body 5 from shaking radially inside the outer shell 1. After confirming that the limiting force of the limiting plate 31 on the aluminum core package body 5 is qualified, the end cover body 4 and the outer shell 1 are sealed. At this time, the relative positions of the limiting sleeve 21, the slide rod 22, and the expansion spring 23 are locked, and the limiting force of the limiting plate 31 on the aluminum core package body 5 remains stable. The operation is simple to achieve the limiting and fixing of the aluminum core package body 5 without the need for glue. Compared with the traditional glue fixing method, it is safer, has no risk of chemical aging, and avoids cracking, delamination, and other situations that may lead to loosening of the aluminum core package body 5, poor contact of the electrode tabs, and leakage. Moreover, it does not react with electrolyte, aluminum foil, etc., and has no negative impact on electrical performance.

[0041] When the aluminum core package body 5 is stacked, a small amount of air may be trapped. By setting several guide holes 33 on the surface of the limiting plate 31 and the insulating pad 32, the guide holes 33 can serve as exhaust channels. During the standing stage after the electrolyte is injected, the air is facilitated to be discharged upward through the guide holes 33, which helps to reduce the air bubbles remaining between the aluminum core package body 5 and the limiting plate 31 and the insulating pad 32. Since air bubbles will occupy the electrolyte space, causing some aluminum foil to be unable to participate in the reaction and thus reducing the actual capacity, promoting the removal of air bubbles also helps to increase the actual capacity.

[0042] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0043] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A high-capacity, long-life bolt-type aluminum electrolytic capacitor, comprising a housing (1), characterized in that: The top of the outer shell (1) is connected to the end cap body (4). The outer shell (1) is provided with an elastic component (2) and a limiting component (3). The inner side of the outer shell (1) is connected to the aluminum core package body (5). The inner side of the end cap body (4) is connected to two screws (6). The surfaces of the two screws (6) are connected to welding points (8). The bottom ends of the two welding points (8) are connected to strip-shaped guide foils (9). The bottom ends of the two strip-shaped guide foils (9) are connected to the top of the aluminum core package body (5). The surface of the end cap body (4) is connected to an explosion-proof valve (7). The surface of the elastic component (2) is connected to the inner side of the outer shell (1) to drive the elastic component (2) to extend and retract in the horizontal direction; The surface of the limiting component (3) is connected to the surface of the elastic component (2) to drive the limiting component (3) to move horizontally to limit the aluminum core package body (5).

2. The bolt-type aluminum electrolytic capacitor with large capacity and long life according to claim 1, characterized in that: The elastic component (2) includes eight limiting sleeves (21), all of which are disposed on the inner wall of the outer shell (1). Each limiting sleeve (21) has a sliding rod (22) slidably connected to its inner side, and an expansion spring (23) is sleeved on the outer side of each limiting sleeve (21).

3. The bolt-type aluminum electrolytic capacitor with large capacity and long life according to claim 2, characterized in that: Each of the limiting sleeves (21) and each of the slide bars (22) is made of 304 stainless steel, and each of the expansion springs (23) is made of nickel-based high-temperature alloy.

4. A high-capacity, long-life bolt-type aluminum electrolytic capacitor according to claim 2, characterized in that: The limiting component (3) includes four limiting plates (31), each of the limiting plates (31) is respectively disposed at one end of each pair of sliding rods (22), and an insulating pad (32) is connected to one side of each of the four limiting plates (31). A plurality of flow guide holes (33) are opened on the surface of the four limiting plates (31) and the surface of the four insulating pads (32).

5. A high-capacity, long-life bolt-type aluminum electrolytic capacitor according to claim 4, characterized in that: The two ends of each pair of expansion springs (23) are respectively connected to the inner wall of the outer shell (1) and the other side of each of the limiting plates (31).

6. A high-capacity, long-life bolt-type aluminum electrolytic capacitor according to claim 4, characterized in that: The limiting plate (31) is made of polytetrafluoroethylene.

7. A high-capacity, long-life bolt-type aluminum electrolytic capacitor according to claim 4, characterized in that: The surfaces of the four insulating pads (32) are all in contact with the surface of the aluminum core body (5).

8. A high-capacity, long-life bolt-type aluminum electrolytic capacitor according to claim 1, characterized in that: Both of the aforementioned screw connectors (6) are made of high-purity electrolytic copper.

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