Explosion-proof flame-retardant capacitor

Abstract

The utility model discloses an explosion-proof flame-retardant capacitor, which comprises a capacitor body, an explosion-proof flame-retardant block, an insulating sleeve wrapping the explosion-proof flame-retardant block and the capacitor body, and a metal explosion-proof fixing device sleeved on the insulating sleeve, wherein the explosion-proof flame-retardant block is arranged at one end, provided with the explosion-proof valve, of the capacitor body, and is tightly attached to the explosion-proof valve of the capacitor body; the insulating sleeve sleeves the explosion-proof flame-retardant block and the capacitor body together; and the metal explosion-proof fixing device is sleeved at the tail part of the insulating sleeve. The explosion-proof and flame-retardant capacitor has good explosion-proof and flame-retardant effects, can prevent fire disasters caused by explosion of the capacitor core bag, can be stably and fixedly installed on a circuit board, and is high in safety performance.

Description

Technical Field

[0001] This utility model belongs to the field of electronic device technology, and in particular relates to an explosion-proof and flame-retardant capacitor. Background Technology

[0002] Among various capacitors, explosion-proof and flame-retardant capacitors are more popular than other types of capacitors. For the same size, aluminum electrolytic capacitors can achieve a larger CV value per unit area, store more charge, and are cheaper.

[0003] Explosion-proof and flame-retardant capacitors are generally equipped with explosion-proof structures, such as explosion-proof valves or explosion-proof holes. Typically, the explosion-proof devices of most explosion-proof and flame-retardant capacitors are located on the aluminum shell, such as explosion-proof holes or explosion-proof valves designed on the bottom or side. The main purpose is that during the use of the explosion-proof and flame-retardant capacitor, if a performance abnormality occurs and the capacitor itself heats up, the electrolyte inside the capacitor will vaporize and generate a large amount of gas inside the shell. When the gas pressure exceeds the pressure release value of the explosion-proof valve, the explosion-proof valve will open, releasing the electrolyte and gas, thus preventing the capacitor from exploding.

[0004] Although most aluminum electrolytic capacitors are designed with explosion-proof structures, capacitor bursting can still occur. Explosion-proof and flame-retardant capacitors, because their electrolyte is primarily composed of ethylene glycol and polymer materials, which are flammable, and adsorbed onto the electrolytic paper, which is also flammable, can easily cause the capacitor core to ignite upon bursting due to the spark. Once a capacitor catches fire, it can damage the entire device using the capacitor, or even cause a serious fire, endangering the user's property and life. Therefore, the explosion-proof and flame-retardant design of explosion-proof capacitors is extremely important.

[0005] The above background information is provided only to aid in understanding the inventive concept and technical solution of this utility model. It does not necessarily belong to the prior art of this patent application. In the absence of clear evidence that the above information was disclosed on the filing date of this patent application, the above background information should not be used to evaluate the novelty and inventiveness of this application. Utility Model Content

[0006] The purpose of this invention is to provide an explosion-proof and flame-retardant capacitor to solve at least one of the problems mentioned in the background section.

[0007] To achieve the above objectives, the technical solution of this utility model embodiment is implemented as follows:

[0008] An explosion-proof and flame-retardant capacitor includes a capacitor body, an explosion-proof and flame-retardant block, an insulating sleeve covering the explosion-proof and flame-retardant block and the capacitor body, and a metal explosion-proof fixing device fitted onto the insulating sleeve; wherein, the explosion-proof and flame-retardant block is disposed at the end of the capacitor body where the explosion-proof valve is located, and is in close contact with the explosion-proof valve of the capacitor body; the insulating sleeve connects the explosion-proof and flame-retardant block and the capacitor body together; and the metal explosion-proof fixing device is fitted onto the tail end of the insulating sleeve.

[0009] In some embodiments, the insulating sleeve includes a first part and a second part; the first part is used to accommodate the capacitor body, and the second part is used to accommodate the explosion-proof and flame-retardant block.

[0010] In some embodiments, the metal explosion-proof fixing device includes a first explosion-proof space and a second explosion-proof space with unequal inner diameters; wherein the inner diameter of the first explosion-proof space is equal to the outer diameter of the second part of the insulating sleeve, and the inner diameter of the second explosion-proof space is equal to the outer diameter of the first part of the insulating sleeve.

[0011] In some embodiments, the outer diameter of the first portion of the insulating sleeve is larger than the outer diameter of the second portion.

[0012] In some embodiments, the second explosion-proof space has a fixed pin that is flush with the opening of the second explosion-proof space and tangent to the inner circle of the second explosion-proof space.

[0013] In some embodiments, the capacitor body includes an aluminum shell, a core package installed inside the aluminum shell, and a cover plate for encapsulating the core package inside the aluminum shell; wherein, the explosion-proof valve is provided at the bottom of the aluminum shell; the core package includes a plurality of electrolytic paper layers, an aluminum foil layer, and lead-out pins disposed on the aluminum foil layer, the lead-out pins extending outward through the cover plate.

[0014] In some embodiments, the explosion-proof and flame-retardant block is provided with a plurality of vent holes.

[0015] In some embodiments, the diameter of the explosion-proof flame-retardant block is less than or equal to the diameter of the cover plate.

[0016] In some embodiments, the surface size of the explosion-proof flame-retardant block is equal to the size of the bottom surface of the core package, or the surface size of the explosion-proof flame-retardant block is greater than the size of the bottom surface of the core package, but less than or equal to the size of the bottom surface of the capacitor body.

[0017] In some embodiments, the vent holes are arranged around the center of the explosion-proof and flame-retardant block, wherein the density of vent holes in the central portion is greater than the density of vent holes in the edge portion.

[0018] The beneficial effects of this utility model's technical solution are:

[0019] Compared with existing technologies, the explosion-proof and flame-retardant capacitor of this invention has excellent explosion-proof and flame-retardant effects, which can prevent fires caused by the explosion of the capacitor core, and can be stably fixed on the circuit board, with high safety performance. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a three-dimensional schematic diagram of an embodiment of the explosion-proof and flame-retardant capacitor of the present invention;

[0022] Figure 2 This is a partially exploded schematic diagram of an embodiment of the explosion-proof and flame-retardant capacitor of the present invention;

[0023] Figure 3 This is a schematic diagram of the internal structure of an explosion-proof and flame-retardant capacitor according to an embodiment of the present invention after being cut open.

[0024] Figure 4 This is a schematic diagram of the separation of the insulating sleeve and the capacitor body of an explosion-proof and flame-retardant capacitor according to an embodiment of the present invention;

[0025] Figure 5 This is a three-dimensional schematic diagram of the explosion-proof and flame-retardant block of an explosion-proof and flame-retardant capacitor according to an embodiment of the present invention;

[0026] Figure 6 This is a cross-sectional schematic diagram of the explosion-proof and flame-retardant block of an explosion-proof and flame-retardant capacitor according to an embodiment of the present invention;

[0027] Figure 7 This is an exploded view of an embodiment of the explosion-proof and flame-retardant capacitor of the present invention;

[0028] Figure 8 This is another exploded view of an embodiment of the explosion-proof and flame-retardant capacitor of the present invention;

[0029] Figure 9 This is a three-dimensional schematic diagram of another embodiment of the explosion-proof and flame-retardant capacitor of the present invention;

[0030] Figure 10 yes Figure 9 A cross-sectional internal view of the explosion-proof and flame-retardant capacitor in the embodiment;

[0031] Figure 11 yes Figure 9 A partially enlarged cross-sectional schematic diagram of the explosion-proof and flame-retardant capacitor in the embodiment;

[0032] Figure 12 yes Figure 9 A three-dimensional schematic diagram of the metal explosion-proof fixing device for an explosion-proof and flame-retardant capacitor, as shown in the embodiment.

[0033] Figure 13 yes Figure 9 An exploded perspective view of the explosion-proof and flame-retardant capacitor of the embodiment. Detailed Implementation

[0034] To make the technical problems, technical solutions, and beneficial effects of the embodiments of this utility model clearer and more understandable, and to enable those skilled in the art to better understand the solutions of this utility model, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of this utility model.

[0035] It should be noted that when a component is referred to as "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as "connected to" another component, it can be directly connected to or indirectly connected to that other component. Furthermore, a connection can be for both fixing and circuit connection purposes.

[0036] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0037] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the embodiments of this utility model, unless otherwise expressly specified and limited, "multiple" means two or more. Terms such as "installed," "connected," "joined," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; a mechanical connection or an electrical connection; a direct connection or an indirect connection through an intermediate medium; or a connection within two components or an interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0038] Reference Figures 1-5 , Figures 7-9 As shown in the figure, as an embodiment of the present invention, an explosion-proof and flame-retardant capacitor 100 is provided, including a capacitor body 10, an explosion-proof and flame-retardant block 11, an insulating sleeve 12 covering the explosion-proof and flame-retardant block 11 and the capacitor body 10, and a metal explosion-proof fixing device 40 sleeved on the insulating sleeve; wherein, the explosion-proof and flame-retardant block 11 is disposed at one end of the capacitor body where the explosion-proof valve 1010 is located, and is in close contact with the explosion-proof valve 1010 of the capacitor body; the insulating sleeve 12 sleeves the explosion-proof and flame-retardant block 11 and the capacitor body 10 together.

[0039] Reference Figure 7 , Figure 8 As shown, the capacitor body 10 includes an aluminum shell 101, a core package 20 installed inside the aluminum shell 101, and a cover plate 30 for encapsulating the core package 20 inside the aluminum shell 101; wherein, an explosion-proof valve 1010 is provided at the bottom of the aluminum shell; the core package 20 includes a plurality of electrolytic paper layers, an aluminum foil layer, and lead-out pins 201 disposed on the aluminum foil layer, the lead-out pins 201 extending outward through the cover plate 30.

[0040] Reference Figure 2 , Figure 3 , Figure 4As shown, in some embodiments, the insulating sleeve 12 includes a first portion 120 and a second portion 121; the length of the first portion 120 is greater than the length of the second portion 121, wherein the first portion is used to accommodate the capacitor body 10, and the second portion 121 is used to accommodate the explosion-proof flame-retardant block 11. In some embodiments, the length of the first portion 120 is equal to the length of the capacitor body 10; the inner diameter of the first portion 120 is adapted to the outer diameter of the capacitor body 10, such that the side of the capacitor body 10 is in complete contact with the inner wall of the first portion 120. In some embodiments, the inner diameter of the second portion 121 is equal to the outer diameter of the explosion-proof flame-retardant block 11, and the open end of the second portion 121 is sealed by a rolled edge to cover the periphery of the explosion-proof flame-retardant block, such that the explosion-proof flame-retardant block 11 abuts against the explosion-proof valve 1010 of the capacitor body 10. In some embodiments, the outer diameter of the first portion 120 of the insulating sleeve 12 is greater than the outer diameter of the second portion 121.

[0041] Reference Figure 3 , Figures 5-8 As shown, in some embodiments, the explosion-proof flame-retardant block 11 is provided with a plurality of vent holes 110. In some embodiments, the explosion-proof flame-retardant block 11 is circular, and the direction of the plurality of vent holes 110 is perpendicular to the radial direction of the circular explosion-proof flame-retardant block 11. In some embodiments, the vent holes 110 are arranged around the center of the explosion-proof flame-retardant block 11, wherein the vent hole density of the central portion is greater than the vent hole density of the edge portion. (Refer to...) Figure 4 , Figure 5 As shown, in some embodiments, the vent 110 is cross-shaped. This cross-shaped design increases the gas flow rate through the air passage while preventing the passage of large liquid or solid particles. In some embodiments, the explosion-proof flame-retardant block 11 is a high-porosity flame-retardant sponge block or a high-porosity flame-retardant sheet. In some embodiments, the material of the explosion-proof flame-retardant block 11 is one or a combination of foamed cement, foamed metal sponge, foamed polymer sponge, and multi-layer genuine leather. In some embodiments, the surface size of the explosion-proof flame-retardant block 11 is equal to the size of the bottom surface of the core package, or the surface size of the explosion-proof flame-retardant block 11 is larger than the size of the bottom surface of the core package but smaller than or equal to the size of the bottom surface of the capacitor body, thereby ensuring that the explosion-proof flame-retardant block completely covers the explosion-proof valve 1010 at the bottom of the capacitor body.

[0042] Reference Figure 2 , Figure 7 , Figure 8As shown, in some embodiments, the cover plate 30 has a circular hole 301, and the guide pin 201 extending from the core package 20 passes through the circular hole 301 on the cover plate 30 and extends outward. In some embodiments, the cover plate 30 is a rubber stopper; the core package 20 is placed inside the aluminum shell, and the opening of the aluminum shell 101 is sealed by the rubber stopper, with the opening of the aluminum shell being rolled to fix the rubber stopper. In some embodiments, the surface of the rubber stopper is provided with protrusions 302. This design can increase the redundancy of the rubber stopper and enhance the sealing effect of the cover plate.

[0043] In some embodiments, the cover plate 30 is circular, and the diameter of the explosion-proof flame-retardant block 11 is less than or equal to the diameter of the cover plate 30. In some embodiments, the thickness of the explosion-proof flame-retardant block 11 is less than the thickness of the cover plate 30.

[0044] In some embodiments, the core package 20 includes a first electrolytic paper layer, an anode aluminum foil layer, a second electrolytic paper layer, and a cathode aluminum foil layer arranged sequentially from the inside out; a positive electrode lead-out pin is riveted to the anode aluminum foil layer, and a negative electrode lead-out pin is riveted to the cathode aluminum foil layer; wherein, a sandwich paper film is provided at the position where the positive electrode lead-out pin is riveted to the anode aluminum foil layer and / or at the position where the negative electrode lead-out pin is riveted to the cathode aluminum foil layer; the first electrolytic paper layer, the anode aluminum foil layer with the riveted positive electrode lead-out pin, the second electrolytic paper layer, and the cathode aluminum foil layer with the riveted negative electrode lead-out pin are wound together to form the core package. In some embodiments, the core package 20 has a through hole along its central axis. In some embodiments, the positive electrode lead-out pin and the negative electrode lead-out pin have the same structure; the positive electrode lead-out pin includes a flat, sheet-like riveting portion, the height of which is less than the height of the sandwich paper film. In some embodiments, the positive electrode needle and the negative electrode needle have different structures, the thickness of the negative electrode needle is 100 μM-200 μM, and the thickness of the negative electrode aluminum foil layer is 20 μM-60 μM.

[0045] In some embodiments, the thickness of the electrolytic paper layer is 40µm-70µm, and the electrolytic paper is a double-layer composite paper with a rotary screen or a double-layer composite paper with a rotary screen and a special screen. In some embodiments, the fiber structure of the electrolytic paper is circular.

[0046] Reference Figures 9-13As shown in another embodiment of this utility model, a metal explosion-proof fixing device 40 is provided at the end of the explosion-proof and flame-retardant capacitor opposite to the cover plate 30. The metal explosion-proof fixing device 40 includes a first explosion-proof space and a second explosion-proof space with unequal inner diameters, and a fixing pin 401 extending from the second explosion-proof space. The metal explosion-proof fixing device 40 is sleeved on the tail of the insulating sleeve 12, wherein the inner diameter of the first explosion-proof space is equal to the outer diameter of the second part 121 of the insulating sleeve 12, and the inner diameter of the second explosion-proof space is equal to the outer diameter of the first part 120 of the insulating sleeve 12, so that the tail of the insulating sleeve 12 is in complete contact with the inner wall of the metal explosion-proof fixing device. In some embodiments, a gap is provided between the bottom of the insulating sleeve 12 and the end of the metal explosion-proof fixing device.

[0047] Reference Figure 12 As shown, there are two fixed pins 401, which are respectively located on both sides of the second explosion-proof space. In some embodiments, the fixed pins 401 are in the shape of straight plates, flush with the opening of the second explosion-proof space, and tangent to the inner circle of the second explosion-proof space. With this arrangement, the electrolytic capacitor can be stably mounted and fixed on the circuit board during installation.

[0048] It is understood that the above description is a further detailed explanation of the present invention in conjunction with specific / preferred embodiments, and should not be construed as limiting the specific implementation of the present invention to these descriptions. For those skilled in the art, various substitutions or modifications can be made to these described embodiments without departing from the inventive concept, and all such substitutions or modifications should be considered within the scope of protection of this patent. In the description of this specification, the reference to terms such as "an embodiment," "some embodiments," "preferred embodiment," "example," "specific example," or "some examples," etc., indicates that the specific features, structures, materials, or characteristics described in connection with that embodiment or example are included in at least one embodiment or example of the present invention.

[0049] In this specification, the illustrative expressions of the terms used do not necessarily refer to the same embodiments or examples. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, those skilled in the art can combine and integrate the different embodiments or examples described herein, as well as the features of different embodiments or examples, without contradiction. Although embodiments of the present invention and their advantages have been described in detail, it should be understood that various changes, substitutions, and modifications can be made herein without departing from the scope defined by the appended claims.

[0050] Furthermore, the scope of this invention is not intended to be limited to the specific embodiments of the processes, machines, manufactures, material compositions, means, methods, and steps described in the specification. Those skilled in the art will readily understand that existing or later-developed disclosures, processes, machines, manufactures, material compositions, means, methods, or steps that perform substantially the same function as the corresponding embodiments described herein or obtain substantially the same results as the embodiments described herein can be utilized. Therefore, the appended claims are intended to include such processes, machines, manufactures, material compositions, means, methods, or steps within their scope.

Claims

1. An explosion-proof flame-retardant capacitor characterized by: The capacitor body, the explosion-proof and flame-retardant block, the insulating sleeve covering the explosion-proof and flame-retardant block and the capacitor body, and the metal explosion-proof fixing device sleeved on the insulating sleeve; wherein the explosion-proof and flame-retardant block is arranged at one end of the capacitor body provided with an explosion-proof valve, and closely contacts the explosion-proof valve of the capacitor body; the insulating sleeve sleeves the explosion-proof and flame-retardant block and the capacitor body together; and the metal explosion-proof fixing device is sleeved on the tail of the insulating sleeve.

2. The flame retardant, explosion-proof capacitor of claim 1, wherein: The insulating sleeve comprises a first part and a second part; the first part is used for accommodating the capacitor body, and the second part is used for accommodating the explosion-proof and flame-retardant block.

3. The flame retardant and explosion-proof capacitor of claim 2, wherein: The metal explosion-proof fixing device comprises a first explosion-proof space and a second explosion-proof space with different inner diameters; wherein the inner diameter of the first explosion-proof space is equal to the outer diameter of the second part of the insulating sleeve, and the inner diameter of the second explosion-proof space is equal to the outer diameter of the first part of the insulating sleeve.

4. The flame retardant and explosion-proof capacitor of claim 2, wherein: The outer diameter of the first part of the insulating sleeve is greater than the outer diameter of the second part.

5. The flame retardant and explosion-proof capacitor of claim 3, wherein: The second explosion-proof space is provided with a fixing pin, which is flush with the opening of the second explosion-proof space and tangent to the inner circle of the second explosion-proof space.

6. The flame retardant and explosion-proof capacitor of claim 1, wherein: The capacitor body comprises an aluminum shell, a core package mounted in the aluminum shell, and a cover plate for packaging the core package in the aluminum shell; wherein the bottom of the aluminum shell is provided with the explosion-proof valve; the core package comprises a plurality of electrolytic paper layers, an aluminum foil layer, and a lead-out needle arranged on the aluminum foil layer, which extends outward through the cover plate.

7. The flame retardant and explosion-proof capacitor of claim 6, wherein: The explosion-proof and flame-retardant block is provided with a plurality of air holes.

8. The flame retardant and explosion-proof capacitor of claim 6, wherein: The diameter of the explosion-proof and flame-retardant block is less than or equal to the diameter of the cover plate.

9. The flame retardant and explosion-proof capacitor of claim 6, wherein: The surface size of the explosion-proof and flame-retardant block is equal to the size of the bottom surface of the core package, or the surface size of the explosion-proof and flame-retardant block is greater than the size of the bottom surface of the core package and less than or equal to the size of the bottom surface of the capacitor body.

10. The flame retardant and explosion-proof capacitor of claim 7, wherein: The air holes are arranged around the center position of the explosion-proof and flame-retardant block, wherein the air hole density of the center part is greater than that of the edge part.

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