A vacuum trigger switch

Abstract

The invention discloses a vacuum trigger switch comprising a closed shell. Negative pole and positive pole are respectively arranged at two ends of the closed shell, the negative pole comprises a negative pole guide rod, a negative pole contact terminal and a negative pole contact terminal sheet, the positive pole comprises a positive pole guide rod, a positive pole contact terminal and a positive pole contact terminal sheet, and the negative pole and the positive pole are hollow cylindrical and are provided with spiral notching, and the negative pole contact terminal and the positive pole contact terminal are of a cup shape, are provided with cylindrical wall, are provided with round hole in the middle of the cup bottom and are provided with spiral notching. The negative pole guide rod and the positive pole guide rod are coaxially and tightly connected with the cup bottoms of the negative pole contact terminal and the positive pole contact terminal, and the cup mouths of the negative pole contact terminal and the positive pole contact terminal are tightly connected with the negative pole contact terminal sheet and the positive pole contact terminal sheet. With the vacuum trigger switch, the electric pole ablated problem caused by electric arc gathering is avoided, the problem that metal plasma bodies in the electric arc splashes to trigger surface can be effectively avoided, service life of the vacuum trigger switch is prolonged and trigger energy is greatly reduced.

Description

technical field [0001] The invention belongs to the technical field of pulse power, and more specifically relates to a vacuum trigger switch. Background technique [0002] The vacuum trigger switch uses vacuum as the main gap insulation medium and arc extinguishing medium between the cathode and anode, and uses a specially designed trigger electrode to control the switch to close. With the development of pulse power technology, it is required that the matching high-power switch can work under high voltage and high current, and can be triggered stably and multiple times under the condition of small trigger energy. Vacuum trigger switch is a switch form that can meet the above requirements at the same time. It has been widely used in high-power pulses, such as high-power lasers, high-power microwave power supplies, and electromagnetic emission technology. [0003] The main electrode structure used in traditional vacuum trigger switches is mostly a simple plate electrode or mu...

AI Technical Summary

Problems solved by technology

[0003] The main electrode structure used in traditional vacuum trigger switches is mostly a simple plate electrode or multi-rod structure. The electromagnetic environment inside the switch is mainly generated when the current flows through the main contacts. Due to the limited strength of the generated magnetic field, it is basically harmful to the development of the arc. However, there are two main types of trigger electrodes: surface-triggered type and field breakdown type. The traditional trigger-electrode structure mostly adopts an open design, which is conducive to triggering the plasma generated along the surface to diffuse more into the main gap, but At the same time, it will also cause the trigger electrode to be easily polluted by the main gap arc.

[0004] The traditional vacuum trigger switch mainly has the following problems: 1) When a large current is passed, the arc of the high current can be equivalent to multiple conductors with the same direction of current, and the conductors with the same direction of current will attract each other. The entire arc column shrinks, and the shrinkage of the arc column will aggravate the ablation of the electrode; 2) After working under high current for many times, the metal plasma generated by the arc will be deposited on the trigger edge surface, resulting in shortened switch life

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