Aluminum electrolytic capacitor with pressure detection function

Abstract

An aluminum electrolytic capacitor with pressure detection comprises a cover plate, a core package and a shell, and the core package is arranged in the shell in a sealed mode through the cover plate. An accommodating hole for accommodating the pressure detector is formed in the cover plate, and the pressure detector is arranged in the accommodating hole and then is hermetically connected with the cover plate. According to the utility model, the pressure detector is arranged on the cover plate, so that the abnormal rise of the internal pressure of the shell can be detected before the pressure valve on the cover plate acts; therefore, the capacitor can be replaced at the optimal time before a fault occurs.

Description

TECHNICAL FIELD

[0001] The utility model relates to an aluminum electrolytic capacitor, especially an aluminum electrolytic capacitor with pressure detection. BACKGROUND

[0002] At present, large aluminum electrolytic capacitors, such as horn-shaped aluminum electrolytic capacitors and bolt-shaped aluminum electrolytic capacitors, are generally liquid aluminum electrolytic capacitors; however, liquid aluminum electrolytic capacitors will inevitably have the risk of electrode liquid leakage due to the use of electrolyte. The electrolyte leakage of the aluminum electrolytic capacitor is generally caused by the opening of the pressure valve due to excessive pressure in the aluminum electrolytic capacitor shell.

[0003] When the internal pressure of the existing aluminum electrolytic capacitor exceeds the action pressure of the pressure valve, the pressure valve acts, causing the pressure in the capacitor to leak, preventing dangerous conditions. If the pressure valve malfunctions or acts too slowly, it will cause the electrolyte to vaporize and spray out of the shell, thereby adhering to the circuit board, thereby damaging the circuit board. SUMMARY

[0004] The technical problem to be solved by the utility model is to overcome the deficiencies of the prior art and provide an aluminum electrolytic capacitor with pressure detection.

[0005] To solve the above technical problems, the technical scheme provided by the utility model is as follows: an aluminum electrolytic capacitor with pressure detection, comprising a cover plate, a core package and a shell, the core package is sealed in the shell through the cover plate; the cover plate is provided with a containing hole for containing a pressure detector, and the pressure detector is sealingly connected between the containing hole and the cover plate after being arranged in the containing hole.

[0006] The aluminum electrolytic capacitor with pressure detection described above is preferably provided with a shell, a base, a pressure sensing piece and an external terminal; the pressure sensing piece is arranged in a containing cavity formed by the shell and the base, the shell at the lower part of the containing cavity is provided with a vent hole; the external terminal is connected with the pressure sensing piece and extends out of the base.

[0007] The aluminum electrolytic capacitor with pressure detection described above is preferably provided with a cavity at the bottom of the base, and after the upper part of the base is connected with the shell, the bottom of the shell is arranged at the lower part of the cavity to form the containing cavity.

[0008] The aluminum electrolytic capacitor with pressure detection, preferably, the pressure sensor comprises a pressure disc, a transmission block and a connecting spring; the pressure disc is extruded between a gasket and a base around the periphery, the gasket is arranged at the bottom of the shell and is in sealing connection with the shell; the lower middle part of the pressure disc is opposite to the air hole, the upper middle part of the pressure disc is provided with the transmission block, the transmission block is arranged in the accommodating cavity and is movable in the accommodating cavity; the connecting spring is arranged above the transmission block; the transmission block is provided with a top block for pushing the connecting spring, and the connecting spring is in contact with or separated from the external terminal under the action of the top block.

[0009] The aluminum electrolytic capacitor with pressure detection, preferably, the top block is arranged around the top of the transmission block, a base above the top block is provided with a push block corresponding to the top block, and the push block is on one side of the top block.

[0010] The aluminum electrolytic capacitor with pressure detection, preferably, the external terminal comprises external columns arranged side by side, and the bottom of the external column is opposite to the connecting spring.

[0011] Compared with the prior art, the aluminum electrolytic capacitor with pressure detection has the advantages that in the aluminum electrolytic capacitor with pressure detection, the pressure detector is arranged on the cover plate, and the abnormal rise of the pressure in the shell can be detected before the pressure valve on the cover plate acts; thus, the capacitor can be replaced at the best opportunity before a fault occurs. BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1 It is a structure schematic view of the aluminum electrolytic capacitor with pressure detection in embodiment 1.

[0013] Figure 2 It is a connection structure schematic view of the pressure detector on the cover plate in embodiment 1.

[0014] Figure 3 It is a sectional structure schematic view of the cover plate in embodiment 1.

[0015] Figure 4 It is a structure schematic view of the pressure detector under normal conditions in embodiment 1.

[0016] Figure 5 It is a structure schematic view of the pressure detector in the case of detecting the abnormal rise of the pressure in embodiment 1.

[0017] LEGEND

[0018] 1, cover plate; 11, accommodating hole; 12, resin plate; 13, rubber layer; 2, shell; 3, pressure detector; 31, shell; 32, base; 321, push block; 33, pressure sensor; 331, pressure disc; 332, transmission block; 3321, top block; 333, connecting spring; 34, external column; 35, gasket; 4, sealing glue. DETAILED DESCRIPTION

[0019] For the convenience of understanding the present application, the present application will be described more fully below with reference to the accompanying drawings and preferred embodiments, but the scope of protection of the present application is not limited to the following specific embodiments.

[0020] It should be particularly noted that when an element is described as being "fixed to, attached to, connected to or communicated with" another element, it can be directly fixed, attached, connected or communicated with the other element, or indirectly fixed, attached, connected or communicated with the other element through other intermediate connecting elements.

[0021] Unless otherwise defined, all technical terms used in the following have the same meanings as commonly understood by one of ordinary skill in the art. The technical terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the scope of protection of the present application. EMBODIMENT

[0022] As Figure 1 shown in a kind of aluminum electrolytic capacitor with pressure detection, it is a kind of cowhorn type aluminum electrolytic capacitor, it includes cover plate 1, core package and shell 2, the core package is sealed and arranged in shell 2 by cover plate 1;Electrolyte is contained in the core package impregnation. Cover plate 1 is provided with containing hole 11 containing pressure detector 3, pressure detector 3 is arranged in containing hole 11 after sealing connection between pressure detector 3 and cover plate 1.

[0023] In the embodiment, as Figure 2 And Figure 3 Shown, pressure detector 3 and cover plate 1 can be the shell 31 of pressure detector 3 and the resin plate 12 of cover plate 1 are connected by screw thread, can be coated with a layer of sealing glue 4 on screw thread;To ensure sealing effect, pressure detector 3 can be further filled in containing hole 11 in the upper part of pressure detector 3 by sealing glue 4 to seal, sealing glue 4 needs to cover the resin plate 12 of cover plate 1 entirely and is sealed and connected between the rubber layer 13 of cover plate 1, the external terminal of pressure detector 3 extends sealing glue 4.In the embodiment, pressure detector 3 can also be directly sealed in the containing hole of cover plate 1 by sealing glue 4, and sealing glue 4 is sealed and connected between the resin plate 12 and the rubber layer 13 of cover plate 1.In the embodiment, when sealing glue 4 is used to seal pressure detector 3 on cover plate 1, the air hole on the base of pressure detector 3 needs to be leaked.

[0024] In the embodiment, the pressure detector 3 comprises a shell 31, a base 32, a pressure sensing member 33 and external terminals; the pressure sensing member 33 is arranged in a receiving cavity formed by the shell 31 and the base 32, and a vent hole is arranged on the lower part of the shell 31; the external terminals are connected with the pressure sensing member 33 and extend out of the base 32. In the embodiment, the vent hole is arranged on the shell 31, so that the internal pressure generated by the vaporization of the electrolyte on the core of the shell 2 due to heating can act on the pressure sensing member 33.

[0025] In the embodiment, the bottom of the base 32 is provided with a cavity, and the upper part of the base 32 is connected with the shell 31, so that the bottom of the shell 31 is arranged at the lower part of the cavity to form the receiving cavity. The pressure sensing member 33 comprises a pressure disc 331, a transmission block 332 and a connecting spring 333; the pressure disc 331 is pressed between the gasket 35 and the base 32 around the periphery, the gasket 35 is arranged on the bottom of the shell 31 and is sealingly connected with the shell 31; the lower part of the middle of the pressure disc 331 is opposite to the vent hole, and the upper part of the middle of the pressure disc 331 is provided with the transmission block 332, which is arranged in the receiving cavity and can move in the receiving cavity; the connecting spring 333 is arranged above the transmission block 332; the transmission block 332 is provided with a top block 3321 for pushing the connecting spring 333, and the connecting spring 333 is in contact with or separated from the external terminals under the action of the top block 3321. The external terminals comprise two external columns 34 arranged side by side, and the bottom of the external column 34 is opposite to the connecting spring 333; a vent hole is arranged on the base between the two external columns 34.

[0026] In the embodiment, the top block 3321 is arranged around the top of the transmission block 332, and a pushing block 321 corresponding to the top block 3321 is arranged on the base above the top block 3321, and the pushing block 321 is on one side of the top block 3321.

[0027] In the embodiment, as shown in Figure 4 , in the normal state, the pressure disc 331 is not subjected to pressure, and the middle of the pressure disc 331 is downwardly convex; at this time, the transmission block 332 does not push the connecting spring 333 upwardly, and the connecting spring 333 is upwardly arched, and the connecting spring 333 is in contact with the two external columns 34 of the external terminals to make the two external columns 34 electrically conductive, so that the external circuit connected with the two external columns 34 can determine that the internal pressure of the aluminum electrolytic capacitor is within the normal range.

[0028] In the embodiment, as shown in Figure 5When the aluminum electrolytic capacitor is heated and vaporized due to a fault, the internal pressure rises, the pressure acts on the pressure plate 331, the middle part of the pressure plate 331 protrudes upward, and the transmission block 332 is pushed to move upward; the top block 3321 on the transmission block 332 and the push block 321 on the base 32 jointly act on the connecting spring 333 to flip and recess downward, so that the connecting spring 333 is separated from the two external columns 34 of the external terminal, thereby electrically disconnecting the two external columns 34, and the external circuit connected with the two external columns 34 can judge that the internal pressure of the current aluminum electrolytic capacitor is rising.

[0029] In the utility model, through setting pressure detector 3 on cover plate 1, can detect the abnormal rise of the pressure in the shell 31 before the pressure valve action on cover plate 1, so that the replacement of the capacitor can be carried out at the best opportunity before the fault occurs.

Claims

1. An aluminum electrolytic capacitor with pressure detection, comprising a cover plate, a core package and a shell, the core package being sealed by the cover plate and arranged in the shell; characterized in that: The cover plate is provided with a receiving hole for receiving the pressure detector, and the pressure detector is sealingly connected between the cover plate and the receiving hole.

2. The aluminum electrolytic capacitor with pressure detection according to claim 1, characterized in that: The pressure detector comprises a shell, a base, a pressure sensing member and an external terminal; the pressure sensing member is arranged in a receiving cavity formed by the shell and the base, the shell at the lower part of the receiving cavity is provided with a vent hole; and the external terminal is connected with the pressure sensing member and extends out of the base.

3. The aluminum electrolytic capacitor with pressure detection according to claim 2, characterized in that: The bottom of the base is provided with a cavity, and the upper part of the base is connected with the shell, the bottom of the shell is arranged at the lower part of the cavity to form the receiving cavity.

4. The aluminum electrolytic capacitor with pressure detection according to claim 2 or 3, characterized in that: The pressure sensing member comprises a pressure disc, a transmission block and a connecting spring; the pressure disc is pressed around the gasket and the base, the gasket is arranged at the bottom of the shell and sealingly connected with the shell; the lower part of the middle of the pressure disc is opposite to the vent hole, the upper part of the middle of the pressure disc is provided with the transmission block, the transmission block is arranged in the receiving cavity and can move in the receiving cavity; the connecting spring is arranged above the transmission block; the transmission block is provided with a top block for pushing the connecting spring, and the connecting spring is in contact with or separated from the external terminal under the action of the top block.

5. The aluminum electrolytic capacitor with pressure detection according to claim 4, characterized in that: The top block is arranged around the top of the transmission block, the base above the top block is provided with a push block corresponding to the top block, and the push block is at one side of the top block.

6. The aluminum electrolytic capacitor with pressure detection according to claim 4, characterized in that: The external terminal comprises external columns arranged side by side, and the bottom of the external column is opposite to the connecting spring.

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