Open circuit failure mode discharge tube

Abstract

The invention discloses an open circuit failure mode discharge tube. The open circuit failure mode discharge tube comprises at least one insulating tube body and two electrodes. The two electrodes are connected with the two ends of the insulating tube body in a sealed mode respectively to form a discharge inner cavity. The two electrodes are connected with the insulating tube body in the sealed mode through high-temperature welding flux, the emitting surface of the inner side of at least one electrode is provided with a through hole penetrating through the outer side of the electrode, and a metal sheet is fixed to the outer side of the corresponding electrode through low-temperature welding flux to close and seal the through hole. The overall structure is simple, the through hole is formed in the corresponding electrode, the metal sheet seals and covers the through hole through the low-temperature welding flux, when the discharge tube generates heat, the low-temperature welding flux is melted, the metal sheet is popped up through gas obtained after heating expansion in the discharge cavity, and external air enters the discharge cavity to enable discharge to fail, so that an open circuit is formed.

Description

technical field [0001] The invention relates to the technical field of discharge tubes, in particular to an open circuit failure mode discharge tube. Background technique [0002] The gas discharge tube is a switch type protection device, usually used as an overvoltage protection device. Currently generally used gas discharge tubes (such as figure 1 shown) is made of an insulating tube body and electrodes sealed at both ends, and the inner cavity is filled with inert gas. When the voltage across the electrodes of the gas discharge tube exceeds the breakdown voltage of the gas, a gap discharge will be caused, and the gas discharge tube will quickly change from a high-resistance state to a low-resistance state, forming a conduction, thereby protecting other devices connected in parallel with it. . But at the same time, if the overvoltage lasts for a long time or occurs frequently, or if there is a long-term or high current, the gas discharge tube will heat up due to the lon...

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Problems solved by technology

But at the same time, if the overvoltage lasts for a long time or occurs frequently, or if there is a long-term or high current, the gas discharge tube will heat up due to the long-term or frequent over-current. Affect the safe use of other devices in the circuit, and make the gas discharge tube have a risk of short circuit or burst, and even burn the customer's circuit board to cause a fire

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