An Anti-Metal Vapor Deposition Structure for Hollow Cathode

Abstract

The present invention is an anti-metal vapor deposition structure for a hollow cathode, comprising a contact holding pole shell cylinder, a first half cylinder, a second half cylinder, a first metal strip, a second metal strip, a mounting flange, and a ceramic ring; the contact The pole holding shell is arranged coaxially with the ceramic ring and fixed through the end face; the ceramic ring is set coaxially with the mounting flange and fixed through the end face; the first half cylinder is set coaxially with the holding pole shell and is fixed through the The end face is connected; the second half-cylinder is arranged coaxially with the contact-holding pole shell tube and fixed by the end face; the first half-cylinder and the second half-cylinder are located at the same axial position relative to the contact-holding pole shell tube; The first metal strip is coaxially arranged with the first semi-cylinder and fixed by the end face; the second metal strip is coaxially arranged with the first semi-cylinder and fixed by the end face; the first metal strip and the second The two metal strips are located at the same axial position relative to the holding pole shell cylinder; the first metal strip and the second metal strip are evenly distributed in the circumferential direction.

Description

technical field [0001] The invention relates to an anti-metal vapor deposition structure for a hollow cathode, which is suitable for the hollow cathode and belongs to the technical field of insulation control measures for the hollow cathode of an electric thruster. Background technique [0002] At present, the two mainstream technical directions of spacecraft electric thrusters are Hall propulsion and ion propulsion. Both the Hall thruster and the ion thruster require a hollow cathode to achieve ionization and plume neutralization of ions. [0003] The hollow cathode is mainly composed of a cathode tube, a top plate, an emitter, a heater, and a contact electrode, and is a rotary structure. When the hollow cathode is working, the heater is first supplied with a heating current until the emitter is heated to a certain emission temperature; then the working fluid flows into the hollow cathode tube, and under the action of the flow-limiting hole on the top of the hollow cathode...

AI Technical Summary

Problems solved by technology

When deposited to a certain amount, it will lead to a decrease in the insulation performance of the ceramic, causing a short circuit in the hollow cathode and causing the life of the hollow cathode to fail.

[0006] In the prior art, the distance from the metal vapor to the insulating ceramic can be extended by increasing the axial length of the hollow cathode or increasing the area of ​​the insulating ceramic, so as to delay or even avoid the insulation drop caused by the deposition of metal vapor to meet the service life. requirements; but this will increase the volume and weight of the hollow cathode

This problem is not serious when a hollow cathode is used in a high-power thruster, but in a low-power thruster, it is required to carry out highly integrated and lightweight design of each component, so this problem will be particularly prominent

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