Assembly type hollow cathode heater

Abstract

The invention relates to an assembly type hollow cathode heater comprising a cathode pipe, a front positioning ring, a ceramic framework, a heater strip, a ceramic jacket, a rear positioning ring, a lead wire pipe and an emitting body, wherein the ceramic framework is sleeved at the excircle of the cathode pipe in a tightly matching way; the emitting body is sleeved in the cathode pipe; the ceramic jacket is sleeved on the ceramic framework wound with the heater strip; the front positioning ring and the rear positioning ring are welded on both ends of the ceramic framework and the ceramic jacket; one end of the heater strip is welded on the cathode pipe, and the other end of the heater strip is sleeved on the lead wire pipe. When the assembly type hollow cathode heater starts, voltage of 10-15V is applied between the lead wire pipe and the cathode pipe so that the heater strip generates current of 8-12 A and lasts for 3 minutes-5 minutes to heat the emitting body to 1500 K-1800 K, thus the emitting body has electronic emission ability. The assembly type hollow cathode heater has simple structure, easy manufacture and high finished product ratio and reliability and can be used for a xenon ion thruster, a Hoare thruster and a plasma source hollow cathode assembly.

Description

technical field [0001] The invention relates to a hollow cathode assembled heater, which belongs to the field of heating devices. Background technique [0002] The hollow cathode assembly is a key component of a xenon ion thruster, Hall thruster, or other plasma source. Before the hollow cathode starts, a heater must be used to heat the emitter inside the cathode tube to a high enough temperature (usually over 1500K), so that the emitter can emit electrons. The existing hollow cathode assembly basically does not use the lead tube structure, and the heating wire is directly drawn out as the lead wire, or the lead wire is wrapped with tantalum foil to increase the strength of the lead wire by thickening the negative wire, but the effect is not ideal; and the structure is complex and not easy to manufacture , Manufacturing yield, low reliability. [0003] The traditional sintered hollow cathode heater, the integrated sintering process technology of ceramics and heating wire i...

AI Technical Summary

Problems solved by technology

The drawing process and quality control procedures of the heating wire of the traditional armored hollow cathode heater are complicated

[0004] The heating wire is not wound in the spiral groove of the ceramic skeleton, so it is not easy to form, and the heating wire is easy to form split defects, which increases the resistance of the lead wire, increases the temperature of the lead wire, and reduces the strength of the lead wire

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