A safe and explosion-proof aluminum electrolytic capacitor

Abstract

This invention relates to the field of capacitor technology, specifically to a safe and explosion-proof aluminum electrolytic capacitor. The capacitor includes a cover plate, an inner shell fixed to the cover plate, a capacitor element disposed within the inner shell, and pins fixed to the cover plate that are connected to the capacitor element. It also includes an outer shell that slides around the inner shell. The inner shell has a vent, and the outer shell has an inlet. A gas storage unit is installed on the outer side of the outer shell to collect gas generated by the capacitor. A buffer ring is fixed to the cover plate, and a connector fixed to the bottom of the outer shell is fixed within the buffer ring. The outer side of the buffer ring is connected to the bottom of the gas storage unit. This invention, through its designed gas storage unit, allows the capacitor element to store gas generated under high pressure or high temperature. Compared to traditional top-venting systems, this prevents the generated high-temperature gas from being blown out, thus avoiding damage to other electrical components.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of capacitors, in particular to a safe and explosion-proof aluminum electrolytic capacitor. BACKGROUND

[0002] The aluminum electrolytic capacitor is made of an aluminum cylinder as a negative electrode, a liquid electrolyte inside, and a piece of curved aluminum strip as a positive electrode.

[0003] The aluminum electrolytic capacitor contains electrolyte inside. When the capacitor is in an overvoltage state, the high voltage will cause the electrolyte to decompose. When the decomposition voltage of the electrolyte is exceeded, the organic solvent (such as ethylene glycol) in the electrolyte may decompose to generate a large amount of gas. At the same time, when a large current or a high ambient temperature is passed, if the heat is not dissipated in time, the internal temperature may be too high. When the temperature reaches the boiling point of the electrolyte, the electrolyte will vaporize, changing from a liquid state to a gaseous state, and the volume will expand rapidly, causing the internal pressure to rise rapidly. These gases accumulate rapidly in the limited space inside the capacitor, causing the internal pressure to rise rapidly, and thus an explosion occurs. The existing aluminum electrolytic capacitor has a vent groove designed at the top of the shell. When the temperature expands, the vent groove breaks, thereby achieving pressure reduction by venting to avoid explosion. However, the gas generated at high temperature and high pressure is generally high-temperature gas. When the gas is vented, the high-temperature gas will be sprayed out, causing damage to other electrical components. SUMMARY

[0004] The present application aims to provide a safe and explosion-proof aluminum electrolytic capacitor to solve the problem of damage to other electrical components caused by high-temperature gas when the existing conventional electrolytic capacitor is vented at high temperature and high pressure.

[0005] To achieve the above-mentioned purpose, the present application provides the following technical solution: a safe and explosion-proof aluminum electrolytic capacitor, comprising a cover plate, an inner shell fixed on the cover plate, a component provided in the inner shell, a pin fixed on the cover plate and opposite to the component, an outer shell sleeved on the outer side of the inner shell, a vent opening provided on the inner shell, an air inlet opening provided on the outer shell, a gas storage unit installed on the outer side of the outer shell to collect the gas generated by the capacitor, and a buffer ring fixed on the cover plate, the buffer ring having a connecting piece fixed to the bottom of the outer shell, and the buffer ring being in abutment with the bottom of the gas storage unit.

[0006] Preferably, the gas storage unit comprises a gas storage sleeve, the top of the gas storage sleeve is fixed to the top of the outer shell, and the bottom of the gas storage sleeve is fixed to the outer side of the buffer ring.

[0007] Preferably, the gas storage sleeve is fixedly provided with a fitting ring, and the fitting ring is bonded to the outer wall of the outer shell.

[0008] Preferably, the number of air vents on the inner shell is multiple, and the air vents are distributed at equal angles on the outside of the top of the inner shell, the outer shell is provided with a plurality of groups of air inlets from top to bottom, the number of air inlets in each group is consistent with the number of air vents, and the inner diameters of the plurality of groups of air inlets increase from top to bottom, and the diameter of the air vent is larger than the diameter of the air inlet.

[0009] Preferably, a groove is formed in the inner wall of the outer shell, and a limiting strip matched with the groove is fixed to the outer wall of the inner shell.

[0010] Preferably, the gas storage sleeve is made of silicone rubber material.

[0011] Preferably, a polyvinyl chloride insulating film is attached to the inner side of the inner shell.

[0012] Preferably, the buffer ring is made of rubber material.

[0013] Preferably, the connecting piece includes a butt joint ring fixed to the inner side of the bottom of the buffer ring, and a plurality of connecting ropes fixed to the bottom of the outer shell are fixed to the butt joint ring.

[0014] Preferably, a bending line is arranged on the outer side of the buffer ring, and the bottom of the gas storage sleeve is fixed to the bending line.

[0015] Compared with the prior art, the beneficial effects of the present application are:

[0016] The gas storage unit designed in the present application can store the gas generated when the element is subjected to high pressure or high temperature, compared with the traditional top exhaust, the generated high-temperature gas can be prevented from blowing outwards, and damage to other electrical elements can be avoided. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the present application;

[0018] Figure 2 It is a schematic diagram of the structure of the present application after the gas storage sleeve is partially cut open;

[0019] Figure 3 It is a front view of the gas storage sleeve and the outer shell after being cut open;

[0020] Figure 4 It is a front view of the gas storage sleeve and the outer shell after being cut open;

[0021] Figure 5 It is a schematic diagram of the structure of the present application after the gas storage sleeve and the outer shell are partially cut open;

[0022] Figure 6 It is Figure 5 It is an enlarged view of A in the figure.

[0023] In the figure: 1, cover plate; 2, inner shell; 3, element; 4, outer shell; 5, air vent; 6, air inlet; 7, gas storage unit; 8, buffer ring; 9, connecting piece; 10, gas storage sleeve; 11, fitting ring; 12, groove; 13, limiting strip; 14, butt ring; 15, connecting rope; 16, bending line. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0025] Embodiment one: please refer to Figure 1 - Figure 5 , a safe and explosion-proof aluminum electrolytic capacitor shown in the figure, comprising a cover plate 1, the cover plate 1 is fixed with an inner shell 2, the inner shell 2 is provided with an element 3, the cover plate 1 is fixed with a pin butt joint with the element 3, further comprising an outer shell 4 sleeved on the outer side of the inner shell 2, the inner shell 2 is provided with an air vent 5, the outer shell 4 is provided with an air inlet 6, the outer side of the outer shell 4 is installed with a gas storage unit 7, the gas storage unit 7 is used to collect the gas generated by the capacitor; and a buffer ring 8 fixed on the cover plate 1, the buffer ring 8 is fixed with a connecting piece 9 fixed with the bottom of the outer shell 4, the outer side of the buffer ring 8 is butt jointed with the bottom of the gas storage unit 7;

[0026] In the present scheme, when the capacitor experiences high temperature or high pressure, the electrolyte in the element 3 vaporizes or decomposes to generate gas, the generated gas is discharged outward through the top of the inner shell 2 and the air vent 5, the generated gas increases the air pressure between the inner shell 2 and the outer shell 4, drives the outer shell 4 to move upward, and part of the gas enters the gas storage unit 7 through the air inlet 6, so that the generated gas can be well stored and recycled, avoiding the generated high-temperature gas from being discharged outward to affect other electrical components;

[0027] It should be noted that: the present scheme recycles the discharged gas by using the gas storage unit 7, and the buffer ring 8 and the connecting piece 9 can pull and buffer the outer shell 4, avoiding the situation of being shot outward due to excessive air pressure.

[0028] Please refer to Figure 3 - Figure 5 , the gas storage sleeve 10 is fixed with a fitting ring 11, the fitting ring 11 is bonded with the outer wall of the outer shell 4, the gas storage sleeve 10 is divided into several spaces by the fitting ring 11, and the fitting ring 11 is bonded with the outer shell 4, so that the several spaces can be separated by the extrusion of air pressure to make the gas flow between the several spaces;

[0029] In the present scheme, the gas storage sleeve 10 is fixed with a fitting ring 11, the fitting ring 11 is bonded with the outer wall of the outer shell 4, the gas storage sleeve 10 is divided into several spaces by the fitting ring 11, and the fitting ring 11 is bonded with the outer shell 4, so that the several spaces can be separated by the extrusion of air pressure to make the gas flow between the several spaces;Figure 3 Figure 5 The number of the air vents 5 on the inner shell 2 is multiple, and the air vents 5 are equiangularly distributed on the outside of the top of the inner shell 2. The outer shell 4 is provided with several groups of air inlets 6 from top to bottom, and the number of the air inlets 6 in each group is consistent with the number of the air vents 5. The inner diameters of the several groups of air inlets 6 increase from top to bottom. The diameter of the air vent 5 is larger than the diameter of the air inlet 6. When the outer shell 4 moves upward due to air pressure, the several groups of air inlets 6 can be aligned with the air vents 5, so that the air outlet can be gradually changed.

[0030] In the drawings: Figure 4 Figure 6 The buffer ring 8 is made of rubber material. The connecting piece 9 includes a butt joint ring 14 fixed on the inner side of the bottom of the buffer ring 8. The butt joint ring 14 is fixed with several connecting ropes 15 fixed on the bottom of the outer shell 4. The buffer ring 8 with certain elasticity is connected with the connecting ropes 15 to butt joint the bottom of the outer shell 4. When the outer shell 4 moves upward, the elasticity of the buffer ring 8 can be used to avoid the problem of rapid upward movement of the outer shell 4.

[0031] In the scheme, when the capacitor is subjected to excessive pressure or high temperature, the electrolyte in the element 3 generates gas. The gas is between the outer shell 4 and the inner shell 2, and the outer shell 4 is first moved upward. The generated gas is discharged into the upper layer of the gas storage sleeve 10 through the air vent 5 and the air inlet 6.

[0032] When the gas is continuously generated, the air pressure between the outer shell 4 and the inner shell 2 increases. At this time, the outer shell 4 moves upward, the space between the outer shell 4 and the inner shell 2 increases, and the next large-diameter air inlet 6 is connected with the air vent 5, so as to meet the storage of the gas when the air jet is larger.

[0033] It should be noted that the gas storage sleeve 10 is made of silicone rubber material, which has the characteristics of high temperature resistance and deformation, and is convenient for recycling and storing high temperature gas. When the gas is filled into the gas storage sleeve 10, the gas is first filled into the upper layer of the gas storage sleeve 10. When the outer shell 4 moves upward, the gas is filled into the middle layer of the gas storage sleeve 10. When the amount of gas is too large, the fitting ring 11 will be broken, so that the gas in the gas storage sleeve 10 can be communicated, and the gas can be recycled.

[0034] In the scheme, in order to achieve good insulation effect in the inner shell 2, a polyvinyl chloride insulation film is attached to the inner side of the inner shell 2.

[0035] Embodiment two: please refer to Figure 4 and Figure 5 The embodiment further illustrates embodiment one, and the difference lies in that the shape of the buffer ring 8 is optimized and improved.

[0036] ​​Specifically, a bending line 16 is provided on the outer side of the buffer ring 8, and the bottom of the air storage sleeve 10 is fixed on the bending line 16. The bending line 16 designed on the outer side of the buffer ring 8 causes the air storage sleeve 10 to move upward when the outer shell 4 moves upward. In conjunction with the designed bending line 16, the buffer ring 8 can be bent more easily along the bending line 16.

[0037] Example 3: Please refer to Figure 6 This embodiment further illustrates other embodiments, the difference being that it optimizes the connection relationship between the outer shell 4 and the inner shell 2.

[0038] Specifically, the inner wall of the outer shell 4 is provided with a groove 12, and the outer wall of the inner shell 2 is fixed with a limiting strip 13 that matches the groove 12. The groove 12 and the limiting strip 13 are designed to cooperate with each other, so that the upper and lower sliding between the outer shell 4 and the inner shell 2 will not rotate, and the air vent 5 and the air inlet 6 can be precisely aligned.

[0039] 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.

[0040] Although embodiments of the 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 invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A safe and explosion-proof aluminum electrolytic capacitor, comprising: A cover plate (1) is provided with an inner shell (2) fixed on the cover plate (1), and a component (3) is provided inside the inner shell (2). A pin that is connected to the component (3) is fixed on the cover plate (1). Its characteristic is that it further includes: An outer shell (4) is slidably fitted onto the outer side of the inner shell (2). The inner shell (2) has a vent (5), and the outer shell (4) has an inlet (6). A gas storage unit (7) is installed on the outer side of the outer shell (4) to collect the gas generated by the capacitor. A buffer ring (8) is fixed on the cover plate (1). A connector (9) fixed to the bottom of the outer shell (4) is fixed inside the buffer ring (8). The outer side of the buffer ring (8) is connected to the bottom of the gas storage unit (7). The gas storage unit (7) includes a gas storage sleeve (10). The top of the gas storage sleeve (10) is fixed to the top of the outer shell (4), and the bottom is fixed to the outer side of the buffer ring (8). A fitting ring (11) is fixed inside the gas storage sleeve (10). The fitting ring (11) is bonded to the outer wall of the outer shell (4). The number of vents (5) on the inner shell (2) is multiple and equiangular. The degree is distributed on the top outer side of the inner shell (2). The outer shell (4) is provided with several sets of air inlets (6) from top to bottom. The number of each set of air inlets (6) is the same as the number of multiple vents (5). The inner diameter of the several sets of air inlets (6) increases from top to bottom. The diameter of the vent (5) is larger than the diameter of the air inlet (6). The gas will be discharged outward through the top of the inner shell (2) and the vent (5). The generated gas increases the air pressure between the inner shell (2) and the outer shell (4), causing the outer shell (4) to move upward. At the same time, some gas enters the gas storage unit (7) through the air inlet (6).

2. The safe and explosion-proof aluminum electrolytic capacitor according to claim 1, characterized in that: The inner wall of the outer shell (4) is provided with a groove (12), and the outer wall of the inner shell (2) is fixed with a limiting strip (13) that is adapted to the groove (12).

3. The safe and explosion-proof aluminum electrolytic capacitor according to claim 1, characterized in that: The gas storage sleeve (10) is made of silicone rubber.

4. The safe and explosion-proof aluminum electrolytic capacitor according to claim 1, characterized in that: The inner shell (2) has a polyvinyl chloride insulating film attached to its inner side.

5. The safe and explosion-proof aluminum electrolytic capacitor according to claim 1, characterized in that: The buffer ring (8) is made of rubber.

6. The safe and explosion-proof aluminum electrolytic capacitor according to claim 1, characterized in that: The connector (9) includes a docking ring (14) fixed to the inner side of the bottom of the buffer ring (8), and a plurality of connecting ropes (15) fixed to the bottom of the outer shell (4) are fixed on the docking ring (14).

7. The safe and explosion-proof aluminum electrolytic capacitor according to claim 5, characterized in that: The buffer ring (8) has a bending line (16) on its outer side, and the bottom of the air storage sleeve (10) is fixed on the bending line (16).

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