Fireproof and explosion-proof varistor

A varistor, explosion-proof technology, used in varistors, overvoltage protection resistors, other resistor networks, etc., can solve problems such as debris splashing, open flame casing, bursting, etc., to avoid open flames, improve safety performance, The effect of solving historic puzzles

Active Publication Date: 2013-07-24
东莞明家防雷技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to overcome the deficiencies in the prior art referred to above, the present invention provides a fire-proof and explosion-proof varistor, so as to avoid unfa

Method used

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  • Fireproof and explosion-proof varistor

Examples

Experimental program
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Effect test

Embodiment 1

[0025] A fire-proof and explosion-proof varistor, as attached figure 1 , 2 , 3 and 4, comprising a flame retardant shell 1 and a piezoresistive device 2 fixed in the flame retardant shell, the flame retardant shell includes a cylindrical outer shell 3 and an inner shell 4, and the bottom of the inner shell is open It also has an inner cavity for containing the piezoresistive device 2. The outer shell 3 is a cavity structure and is covered outside the inner shell 4 to form a full enclosure for the inner shell; the tops of the outer shell and the inner shell are provided with exhaust hole 5, a gap is reserved between the top of the outer casing and the top of the inner casing to form a gas buffer chamber 6.

[0026] In this embodiment, the air vent at the top of the inner shell is rectangular, and the air vent at the top of the outer shell is circular. The air vent can also be square, oval or other reasonable shapes. Preferably, the area of ​​the air vent at the top of the inn...

Embodiment 2

[0035] The difference between this embodiment and the first embodiment lies in that: the inner side of the bottom of the casing is provided with a protruding step surface or a limit block to limit the vertical displacement of the piezoresistive device 2 . Preferably, the piezoresistor device 2 is suspended in the air on the protruding step surface or the limit block, so that there is a gap between it and the bottom of the casing, which can reduce the impact on the flame-retardant case when the piezoresistor device explodes. impact.

[0036] Positioning posts for fixing the piezoresistive device 2 are provided inside the bottom of the housing 3 to limit the displacement of the piezoresistive device 2 in the horizontal direction.

Embodiment 3

[0038] The difference between this embodiment and Embodiment 1 is that the top surface of the piezoresistive device 2 is against the top inner side of the inner shell 4 and the bottom surface is against the bottom inner side of the outer shell 3, and the inner and outer shell walls are applied together. The pressure in the vertical direction realizes the limit; or, the piezoresistive device 2 and the inner shell 4 or the outer shell 3 are fixed by glue.

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Abstract

A fireproof and explosion-proof varistor comprises a flame-retardant casing, and a varistor device fixed in the flame-retardant casing, wherein the flame-retardant casing comprises a columnar outer casing and an inner casing; the bottom of the inner casing is opened and the inner casing is provided with an inner cavity for accommodating a varistor device; the outer casing has a cavity-form structure, and covers the inner casing to completely enclose the inner casing; vent holes are formed in the top of both the outer casing and the inner casing; and a gap is reserved between the top of the outer casing and the top of the inner casing to form an air buffer cavity. The flame-retardant casing with the double-layer structure can limit high-temperature and high-pressure flame caused by explosion of the varistor device according to different ranks; and the inside of the flame-retardant casing can form a state close to vacuum by discharging air from the vent holes smartly formed in the outer casing and the inner casing. Therefore, the flame-retardant casing is in an oxygen deficient state, can avoid undesirable conditions of open fire, casing explosion, fragment splashing and the like when the varistor device is failed, and can completely break large work frequency short circuit current. The fireproof and explosion-proof varistor provided by the invention has remarkable fireproof, explosion-proof and flame-retardant effect, and can reach the expected effect and solve the historical problems in actual application.

Description

technical field [0001] The invention relates to electronic components, in particular to a fire-proof and explosion-proof piezoresistor. Background technique [0002] MOV (abbreviation for metal-oxide-varistor, Metal Oxide Varistor) is widely used in various electronic devices as a surge protection component. It has a certain varistor voltage. When the circuit voltage is less than the varistor voltage When the resistance of the varistor is very large, it is equivalent to the insulation state; when the input voltage is greater than the varistor voltage due to high voltage impact, the resistance of the varistor is very low, which is equivalent to a short circuit state; and when the input voltage is higher than the varistor voltage After the voltage is withdrawn, the varistor returns to the high resistance state. In actual use, the varistor is generally connected in parallel with the protected equipment. When the external surge energy quickly exceeds the withstand capacity ...

Claims

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Application Information

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IPC IPC(8): H01C1/02H01C1/16H01C7/12
Inventor 周建林
Owner 东莞明家防雷技术有限公司
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