Horizontal explosion-proof piezoresistor

Abstract

The invention discloses a horizontal explosion-proof piezoresistor which comprises a piezoresistor main body and a shell, wherein, the shell is formed by assembling a cover and a housing, the housing has an opening at one side and an inner cavity for accommodating the piezoresistor main body, the bottom surface of the housing is provided with lead wire bores, the piezoresistor main body is installed into the inner cavity through the opening, the surface of the piezoresistor main body is provided with a first extraction electrode and a second extraction electrode which bend to the lead wire bores, pass through the lead wire bores and extend out from the housing, and a filling cavity is formed between the outer wall of piezoresistor main body and the inner wall of the inner cavity and is filled with an insulation explosion-proof material. When the piezoresistor provided in the invention fails, splitting of fragments in the situation of explosion is avoided, which enables open fire to be effectively inhibited; the shell is of a horizontal structure, which enables the explosion-proof piezoresistor assembled at the back of a circuit board to have a height less than 10mm, thereby meeting current market demands for electric appliances that explosion-proof piezoresistor products should be small, thin and light.

Description

Technical field [0001] The invention relates to the technical field of varistors. Background technique [0002] Varistor as a pulse surge protector, in the actual circuit, because the varistor is encapsulated with epoxy resin, it is easy to be broken down when the product fails due to the impact of instantaneous strong voltage or strong current Or cracking, product encapsulation layer and porcelain fragments can easily damage other devices and cause the entire circuit to fail. In order to prevent the device from being damaged by the bursting fragments, the structure needs to be improved to prevent the varistor from bursting. At present, there are the following types of conditions to prevent varistor products from bursting after aging: [0003] 1. Put an insulating rubber tube on the outside of the encapsulated varistor product. This method has hollow holes up and down, and the effect is not good. [0004] 2. Install a phenolic resin shell on the outside of the encapsulated varisto...

AI Technical Summary

Problems solved by technology

[0003] 1. Put an insulating rubber tube on the outside of the encapsulated varistor product. This method has empty holes on the top and bottom, and the effect is not good.

[0004] 2. Install a phenolic resin shell on the outside of the encapsulated varistor product. The shell is defective during high and low temperature shocks, and because the internal structure of the shell is loose after assembly, the plug-in effect is not good.

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