Safe and explosion-proof aluminum electrolytic capacitor

Abstract

The invention relates to the technical field of capacitors, and mainly relates to a safe and explosion-proof aluminum electrolytic capacitor, which comprises a cover plate, an inner shell fixed on the cover plate, an element arranged in the inner shell, a pin fixed on the cover plate and in butt joint with the element, and an outer shell slidably sleeved on the outer side of the inner shell, a gas inlet is formed in the shell, a gas storage unit is installed on the outer side of the shell, and gas generated by the capacitor is collected through the gas storage unit; the element comprises a shell, a cover plate fixed on the shell, and a buffer ring fixed on the cover plate, a connecting piece fixed with the bottom of the shell is fixed in the buffer ring, and the outer side of the buffer ring is in butt joint with the bottom of a gas storage unit. Compared with a traditional top exhaust mode, generated high-temperature gas can be prevented from being blown out, and damage to other electric appliance elements is avoided.

Description

Technical Field

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

[0002] Aluminum electrolytic capacitors are made of an aluminum cylinder as the negative electrode, filled with liquid electrolyte, and a curved aluminum strip inserted as the positive electrode.

[0003] Aluminum electrolytic capacitors contain electrolyte. When the capacitor is in an overvoltage state, the excessive voltage causes the electrolyte to decompose. After exceeding the decomposition voltage of the electrolyte, the organic solvent (such as ethylene glycol) in it may decompose and produce a large amount of gas. At the same time, when passing large currents or the ambient temperature is high, 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 liquid to gas, and the volume will expand rapidly, causing the internal pressure to increase rapidly. These gases quickly accumulate in the limited space inside the capacitor, causing the internal pressure to rise sharply, which can cause an explosion. Existing aluminum electrolytic capacitors have a vent groove designed on the top of the casing. When the high temperature expands, the vent groove breaks, thereby achieving exhaust pressure reduction and avoiding explosion. However, the gas generated by high temperature and high pressure is generally hot gas. When venting, the hot gas will spray out and damage other electrical components. Summary of the Invention

[0004] The purpose of the present invention is to provide a safe and explosion-proof aluminum electrolytic capacitor to solve the problem raised in the above background art that when the conventional electrolytic capacitor is exhausted at high temperature and high pressure, the high temperature gas may damage other electrical components.

[0005] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a safe and explosion-proof aluminum electrolytic capacitor, comprising a cover plate, an inner shell fixed on the cover plate, an element arranged in the inner shell, pins connected to the element fixed on the cover plate, and an outer shell slidingly sleeved on the outer side of the inner shell, a vent being provided on the inner shell, and an air inlet being provided on the outer shell, a gas storage unit being installed on the outer side of the outer shell, and the gas generated by the capacitor being collected by the gas storage unit; and a buffer ring fixed on the cover plate, a connector fixed to the bottom of the outer shell being fixed inside the buffer ring, and the outer side of the buffer ring being connected to the bottom of the gas storage unit.

[0006] Preferably, the air storage unit includes an air storage sleeve, the top of the air storage sleeve is fixed to the top of the shell, and the bottom is fixed to the outside of the buffer ring.

[0007] Preferably, a fitting ring is fixed inside the air storage sleeve, and the fitting ring is bonded to the outer wall of the shell.

[0008] Preferably, there are multiple air vents on the inner shell, and they are distributed at equal angles on the outside of the top of the inner shell. Several groups of air inlets are provided on the outer shell from top to bottom. The number of air inlets in each group is consistent with the number of multiple air vents, and the inner diameters of the several groups of air inlets increase successively 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 provided on the inner wall of the outer shell, and a limiting strip adapted to the groove is fixed on the outer wall of the inner shell.

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

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

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

[0013] Preferably, the connecting member includes a docking 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 shell are fixed on the docking ring.

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

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] The gas storage unit designed in the present invention can store the gas when the element is subjected to high pressure or high temperature and generates gas. Compared with the traditional top exhaust, it can prevent the generated high-temperature gas from being blown out and avoid damaging other electrical components. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0018] Figure 2 This is a schematic diagram of the structure of the air storage sleeve of the present invention after partial cross-section;

[0019] Figure 3 This is a front view of the air storage sleeve and the outer shell of the present invention after section;

[0020] Figure 4 This is a sectional front view of the air storage sleeve and the outer shell after the outer shell of the present invention is moved upward;

[0021] Figure 5 This is a schematic diagram of the structure of the air storage sleeve and the shell after partial cross-section of the present invention;

[0022] Figure 6 for Figure 5 Enlarged view of point A in the middle.

[0023] In the figure: 1. Cover plate; 2. Inner shell; 3. Element; 4. Outer shell; 5. Vent; 6. Air inlet; 7. Air storage unit; 8. Buffer ring; 9. Connector; 10. Air storage sleeve; 11. Fitting ring; 12. Groove; 13. Limiting strip; 14. Docking ring; 15. Connecting rope; 16. Bending line. DETAILED DESCRIPTION

[0024] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0025] Example 1: Please refer to Figure 1 - Figure 5 The illustrated safety and explosion-proof aluminum electrolytic capacitor includes a cover plate 1, an inner shell 2 fixed on the cover plate 1, an element 3 disposed in the inner shell 2, a pin connected to the element 3 fixed on the cover plate 1, an outer shell 4 slidingly sleeved on the outer side of the inner shell 2, an air vent 5 provided on the inner shell 2, an air inlet 6 provided on the outer shell 4, a gas storage unit 7 installed on the outer side of the outer shell 4, and the gas generated by the capacitor is collected by the gas storage unit 7; and a buffer ring 8 fixed on the cover plate 1, a connector 9 fixed to the bottom of the outer shell 4 fixed inside the buffer ring 8, and the outer side of the buffer ring 8 butting against the bottom of the gas storage unit 7;

[0026] In this solution, 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 vent 5. The generated gas increases the air pressure between the inner shell 2 and the outer shell 4, driving the outer shell 4 upward. At the same time, part of the gas enters the gas storage unit 7 through the air inlet 6, thereby effectively storing and recovering the generated gas, preventing the generated high-temperature gas from being discharged outward and affecting other electrical components.

[0027] It should be noted that: this solution utilizes the gas storage unit 7 to recover the exhausted gas, and utilizes the buffer ring 8 and the connector 9 to pull and buffer the shell 4 to avoid outward emission due to excessive gas pressure.

[0028] See Figure 3 - Figure 5 A fitting ring 11 is fixed inside the gas storage sleeve 10, and the fitting ring 11 is bonded to the outer wall of the shell 4. The gas storage sleeve 10 is divided into several spaces by the fitting ring 11. At the same time, the fitting ring 11 is bonded to the shell 4 and can be separated by the extrusion of air pressure, so that the gas can circulate between the several spaces.

[0029] Among them, see Figure 3 - Figure 5 There are multiple air vents 5 on the inner shell 2, which are distributed at equal angles on the outside of the top of the inner shell 2. Several groups of air inlets 6 are provided on the outer shell 4 from top to bottom. The number of air inlets 6 in each group is consistent with the number of the multiple air vents 5. The inner diameters of the several groups of air inlets 6 increase from top to bottom. The diameter of the 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 vent 5 respectively, so that the air output can be gradually changed.

[0030] Among them, see Figure 4 - Figure 6 The buffer ring 8 is made of rubber material. At the same time, the connecting member 9 includes a docking ring 14 fixed to the inner side of the bottom of the buffer ring 8. Several connecting ropes 15 fixed to the bottom of the shell 4 are fixed on the docking ring 14. The bottom of the shell 4 is docked through the buffer ring 8 and the connecting rope 15 with a certain elasticity, so that when the shell 4 moves upward, it can be affected by the elasticity of the buffer ring 8, thereby avoiding the problem of the shell 4 moving up quickly and being ejected.

[0031] In this solution, when the capacitor is subjected to excessive high voltage or high temperature, the electrolyte in the element 3 generates gas. The gas between the outer shell 4 and the inner shell 2 will first drive the outer shell 4 to move upward. At the same time, the generated gas will be discharged into the upper layer of the gas storage sleeve 10 through the vent 5 and the air inlet 6.

[0032] As 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, increasing the space between the outer shell 4 and the inner shell 2, and at the same time connecting the next large-diameter air inlet 6 with the air vent 5, thereby meeting the storage of gas when a larger jet volume is required.

[0033] It should also be noted that the gas storage sleeve 10 is made of silicone rubber, which has the characteristics of high temperature resistance and deformation, which is convenient for the recovery and storage of high-temperature gas. When the gas storage sleeve 10 is filled with gas, the gas will first be filled into the upper layer of the gas storage sleeve 10. As the outer shell 4 moves upward, the gas will be filled into the middle layer of the gas storage sleeve 10. When the inflation volume is too large, the fitting ring 11 will collapse, so that the gas in the gas storage sleeve 10 can communicate with each other, which is convenient for the recovery of the gas.

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

[0035] Example 2: Please refer to Figure 4 and Figure 5 This embodiment further explains the first embodiment, 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 outside 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 outside of the buffer ring 8 drives the air storage sleeve 10 to move upward when the shell 4 moves upward. In combination with the designed bending line 16, the buffer ring 8 can bend along the bending line 16 more easily.

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

[0038] Specifically, a groove 12 is provided on the inner wall of the outer shell 4, and a limiting strip 13 adapted to the groove 12 is fixed on the outer wall of the inner shell 2. The designed groove 12 and the limiting strip 13 cooperate with each other, so that the outer shell 4 and the inner shell 2 can slide up and down without rotation, so that 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, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0040] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A safe and explosion-proof aluminum electrolytic capacitor, comprising: A cover plate (1), an inner shell (2) being fixed on the cover plate (1), an element (3) being arranged in the inner shell (2), and a pin connected to the element (3) being fixed on the cover plate (1); It is characterized by further comprising: An outer shell (4) is slidably sleeved on the outer side of the inner shell (2), a vent (5) is provided on the inner shell (2), and an air inlet (6) is provided on the outer shell (4), and a gas storage unit (7) is installed on the outer side of the outer shell (4), and gas generated by the capacitor is collected through the gas storage unit (7); and A buffer ring (8) is fixed on the cover plate (1), wherein a connector (9) fixed to the bottom of the housing (4) is fixed inside the buffer ring (8), and the outer side of the buffer ring (8) is butted against the bottom of the gas storage unit (7).

2. The safe and explosion-proof aluminum electrolytic capacitor according to claim 1, characterized in that: The air storage unit (7) comprises an air storage sleeve (10), the top of the air storage sleeve (10) is fixed to the top of the housing (4), and the bottom is fixed to the outside of the buffer ring (8).

3. The safe and explosion-proof aluminum electrolytic capacitor according to claim 2, characterized in that: A fitting ring (11) is fixed inside the air storage sleeve (10), and the fitting ring (11) is bonded to the outer wall of the shell (4).

4. The safe and explosion-proof aluminum electrolytic capacitor according to claim 1, characterized in that: The inner shell (2) has a plurality of vents (5) which are distributed at equal angles on the outer side of the top of the inner shell (2). The outer shell (4) is provided with a plurality of groups of air inlets (6) from top to bottom. The number of each group of air inlets (6) is consistent with the number of the plurality of vents (5). The inner diameters of the plurality of groups of air inlets (6) increase sequentially from top to bottom, and the diameter of the vents (5) is greater than the diameter of the air inlets (6).

5. The safe and explosion-proof aluminum electrolytic capacitor according to claim 3, characterized in that: A groove (12) is provided on the inner wall of the outer shell (4), and a limiting strip (13) adapted to the groove (12) is fixed on the outer wall of the inner shell (2).

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

7. The safe and explosion-proof aluminum electrolytic capacitor according to claim 1, characterized in that: A polyvinyl chloride insulation film is attached to the inner side of the inner shell (2).

8. The safe and explosion-proof aluminum electrolytic capacitor according to claim 2, characterized in that: The buffer ring (8) is made of rubber material.

9. The safe and explosion-proof aluminum electrolytic capacitor according to claim 1, characterized in that: The connecting member (9) comprises 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 housing (4) are fixed on the docking ring (14).

10. The safe and explosion-proof aluminum electrolytic capacitor according to claim 8, characterized in that: A bending line (16) is provided on the outside of the buffer ring (8), and the bottom of the air storage sleeve (10) is fixed on the bending line (16).

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