Gas discharge tube and metalized electrode used for same

Abstract

The invention provides a gas discharge tube and a metalized electrode used for the gas discharge tube. The gas discharge tube comprises at least two electrodes and an insulating tube body in sealing connection with the electrodes to form a discharge inner cavity, wherein at least one of the electrodes is an insulating material metalized electrode; the metalized electrode comprises a discharge surface for gas discharge and a conducting surface for being connected with an external circuit; and the discharge surface is electrically connected with the conducting surface. When the gas discharge tube provided by the invention suffers from lightning strokes or surge overvoltage, the function of releasing lightning current or overvoltage can be achieved; moreover, when the gas discharge tube suffers from certain continuous power frequency current or ultrahigh power frequency current to warm because of discharge heating until a metal cover layer or a metalized layer on the discharge surface is melted, the discharge surface exposed inside the discharge inner cavity is an insulator or a poor conductor, and discharge is not realized or the discharge effect is weakened, so that the follow current is effectively intercepted.

Description

technical field [0001] The invention relates to the field of overvoltage protection products, in particular to a gas discharge tube and its metallized electrodes. Background technique [0002] The gas discharge tube is a switch type protection device, usually used as an overvoltage protection device. The gas discharge tube commonly used at present is made of a ceramic tube and its two ends sealed with metal electrodes, 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, because it is sealed with metal electrodes and ceramic tubes, if the overvoltage lasts for a long time or occurs frequently, or if there is a long-term or high-curre...

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Problems solved by technology

But at the same time, because it is sealed with metal electrodes and ceramic tubes, if the overvoltage lasts for a long time or occurs frequently, or if there is a long-term or high-current power-frequency overcurrent, the gas discharge tube will suffer from long-term Time or frequent over-current will cause heating and heating up. Excessive temperature will not only affect the safe use of other devices in the circuit, but also cause a large amount of sputtering when the two metal electrodes of the gas discharge tube melt, and it is easy to make the inside of the discharge tube Impedance drop or even short circuit

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