High-impermeability capillary tube discharging plasma generator

Abstract

The invention discloses a high-impermeability capillary tube discharging plasma generator. The generator comprises a nozzle electrode and a closed electrode embedded into a capillary tube, wherein the closed electrode comprises a central cylinder which stretches into the capillary tube and is tightly fitted with the inner surface of the capillary tube as well as an outer ring which is respectively tightly fitted with the outer side wall of the capillary tube, the central cylinder is provided with a convex table at base, and the inner wall of the capillary tube is provided with a concave tableadaptive to the convex table. The closed electrode is designed into a shape like Chinese character shan, on the one hand, contact area between the closed electrode and the capillary tube is obviouslyincreased, on the other hand, the closed electrode is embedded between the capillary tube and an upper insulation sleeve, and length of a channel for plasma to reach the insulation sleeve from the capillary tube is obviously increased. Thus, the plasma can be contacted with the insulation sleeve still by passing through the outer ring of the closed electrode even if electric arc plasma enters into a gap between the central cylinder and the capillary tube in a discharging process, and probability of short circuit caused by the fact that the plasma damages the insulation sleeve is reduced.

Description

technical field [0001] The invention belongs to the technical field of plasma generators, and relates to a highly airtight capillary discharge plasma generator. Background technique [0002] A capillary discharge plasma generator is a common structure used to generate thermal plasma. The resulting thermal plasma can be used for material spraying, waste treatment, X-ray source, and plasma ignition of propellant charges in electrothermal chemical guns. The main structure of the capillary discharge plasma generator includes a capillary tube of polymer material, a closed electrode installed at one end of the capillary tube and a hollow nozzle electrode installed at the other end of the capillary tube. The closed electrode and the spout electrode are connected by metal filaments. During operation, a high-voltage pulse is used to vaporize the metal wire to generate an initial plasma. Under the action of the discharge pulse, the initial plasma evolves into an arc plasma and is e...

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Problems solved by technology

[0004] The problem to be solved by the present invention is to provide a highly airtight capillary discharge plasma generator to solve the problem of internal short circuit in the capillary discharge plasma generator due to insufficient air tightness or insufficient bonding between insulating components

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