A ceramic component of a hollow cathode heater
A hollow cathode and heater technology, which is applied in the fields of vacuum electronics and aerospace electric propulsion technology, can solve the problems of ceramic insulation decline, increase heater heat conduction, heater failure, etc., so as to reduce heat loss and reduce contact area. , reduce the effect of heat exchange
Active Publication Date: 2017-03-22
LANZHOU INST OF PHYSICS CHINESE ACADEMY OF SPACE TECH
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Problems solved by technology
When this structure is applied to the long-life hollow cathode, the impurity of the heater is not sufficiently removed, and the impurity will accumulate on the surface of the ceramic component and the heating wire during long-term work and react with it in a high-temperature environment, and eventually the ceramic insulation will drop, and the heating wire will break, etc. phenomenon, resulting in failure of the heater
The direct contact between the ceramic skeleton and the ceramic jacket not only increases the heat conduction of the heater and reduces the effective heating efficiency of the heater, but also cannot effectively remove impurities inside the heating wire and ceramic components, which restricts the service life of the heater
Method used
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[0017] The present invention will be described in detail below with reference to the accompanying drawings and examples.
[0018] like figure 1 Shown is a schematic view of the structure of the ceramic assembly of the present invention. According to the working conditions and working temperature requirements of the hollow cathode heater, ceramic components need to have good insulation and thermal conductivity at high temperatures. At the same time, the ceramic component has a good function of removing or purifying the working medium, which can effectively remove the impurities generated at high temperature, and avoid the reflection of impurities with ceramics or heating wires, which will affect the life of the heater. Based on the above constraints, the designed ceramic component includes a ceramic skeleton 2 and a ceramic outer shell 1, and the material is selected from beryllium oxide ceramics. The ceramic jacket 1 is a hollow cylinder with one end open and one end closed;...
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Abstract
The invention discloses a ceramic assembly of a hollow cathode heater. The ceramic assembly comprises a ceramic sheath and a ceramic skeleton, an inner wall of the ceramic sheath is formed by two inner circumferential surfaces with different diameters, the ceramic skeleton is a cylinder machined with outside threads, heating wires wind in grooves of the outside threads, an excircle at one end of the ceramic skeleton and an inner circle at the bottom of the ceramic sheath with the smaller diameter are fixedly installed together, and gaps are reserved between the excircle of the ceramic skeleton and the inner circle of the ceramic sheath at the upper parts of step structures. According to the ceramic assembly, the ceramic sheath employs the step structures so that the contact area of the ceramic assembly is reduced, and the loss for generating heat by the heating wires is reduced; impurities evaporated by the heating wires and the ceramic assembly in a high temperature environment are eliminated via the gaps between the ceramic assembly, the structure is applied to a hollow cathode so that heat exchange between the ceramic skeleton and the ceramic sheath can be effectively reduced, and the service lifetime of the hollow cathode heater is extended.
Description
technical field [0001] The invention relates to space electric propulsion technology and the field of vacuum electronics, in particular to a hollow cathode heater insulation and heat preservation ceramic component, which can be used for heat preservation of local high-temperature objects such as space electric propulsion hollow cathode heaters. Background technique [0002] The hollow cathode uses a heater to heat the emitter before ignition. When the temperature of the emitter reaches the electron emission temperature of about 1800K, the working medium gas is broken down by pulse high voltage, and the gas self-sustained discharge is generated, and the hollow cathode is successfully ignited. When the hollow cathode is successfully ignited, the cathode heater assembly no longer needs auxiliary heating, and its working temperature can be maintained only by its own plasma bombarding the emitter material. In order to improve the heating efficiency of the cathode heater and reduc...
Claims
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IPC IPC(8): H01J1/88
Inventor 杨威贾艳辉孙运奎冯杰
Owner LANZHOU INST OF PHYSICS CHINESE ACADEMY OF SPACE TECH