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Emitter with inner core for self-sustaining hollow cathode of spacecraft

A hollow cathode and emitter technology, applied in the direction of discharge tube solid thermionic cathode, discharge tube main electrode, etc., can solve the problems of high evaporation rate, high temperature, short cathode life, etc., and achieve the effect of prolonging life and reducing temperature

Active Publication Date: 2015-08-19
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a self-sustaining hollow cathode emitter with an inner core to solve the problem of short life of the cathode caused by high temperature and high evaporation rate of the emitter material and other parts of the cathode

Method used

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  • Emitter with inner core for self-sustaining hollow cathode of spacecraft
  • Emitter with inner core for self-sustaining hollow cathode of spacecraft
  • Emitter with inner core for self-sustaining hollow cathode of spacecraft

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specific Embodiment approach 1

[0011] Specific implementation mode one: combine image 3 and Figure 4 Describe this embodiment, the emitter of this embodiment includes a circular tube 1, a cylindrical core 2 and two connectors 3, the circular tube 1 is provided with a cylindrical core 2 and the two are coaxially arranged, the circular tube The bottom end surface of 1, the bottom end surface of the cylindrical core body 2 and the bottom end surfaces of the two connecting bodies 3 are on the same plane, and the cylindrical core body 2 is connected with the side wall of the round pipe 1 through the two connecting bodies 3 and the three into one.

[0012] There is a cylindrical core 2 inside the round tube 1. Since the cylindrical core 2 is in the center of the plasma during discharge, it is heated more, and it is also subjected to radiation heat transfer from the round tube 1, making its temperature higher. The temperature of the circular tube 1 is lower; high temperature is conducive to emitting more elect...

specific Embodiment approach 2

[0014] Specific implementation mode two: combination Figure 4 To illustrate this embodiment, the inner diameter D of the circular tube 1 of this embodiment is 1.25-3 times the diameter d of the cylindrical core body 2. The advantage of this structure is that it can reduce the temperature of other parts and have a longer life. Other implementation manners are the same as the specific implementation manner 1.

specific Embodiment approach 3

[0015] Specific implementation mode three: combination image 3 To illustrate this embodiment, the height H of the circular tube 1 in this embodiment is 2-4 times the height h1 of the connecting body 3. The advantage of this structure is that it has sufficient connection strength without affecting the discharge performance. Other implementation modes are the same as the specific implementation mode 1 or 2.

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Abstract

The invention discloses an emitter with an inner core for a self-held hollow cathode of a spacecraft, and relates to the emitter of the self-held hollow cathode. The emitter solves the problem that the service life of the cathode is short due to high temperature and great rate of evaporation of an emitting material and other parts of the cathode. The first scheme is as follows: a circular tube is internally provided with a cylindrical core body and the circular tube and the cylindrical core body are coaxially arranged; the bottom end face of the circular tube, the bottom end face of the cylindrical core body and the bottom end faces of two connectors are located in the same plane; and the cylindrical core body is connected with the side wall of the circular tube through the two connectors, and the cylindrical core body, the circular tube and the two connectors are integrally manufactured. The second scheme is as follows: a core plate is radially arranged in the circular tube and the core plate and the circular tube are integrally manufactured; and the bottom end face of the core plate and the bottom end face of the circular tube are located in the same plane. The third scheme is as follows: the circular tube is internally provided with a cone-shaped core body and the circular tube and the cone-shaped core body are coaxially arranged; the bottom end face of the circular tube, the large diameter end face of the cone-shaped core body and the bottom end faces of two connectors are located in the same plane; and the cone-shaped core body is connected with the side wall of the circular tube through the two connectors and the cone-shaped core body, the circular tube and the two connectors are integrally manufactured. The emitter disclosed by the invention is used for spacecrafts.

Description

technical field [0001] The invention relates to a self-sustaining hollow cathode emitter. Background technique [0002] The self-sustaining hollow cathode is a key component of electric thrusters such as Hall thrusters and ion thrusters. It can also be used for potential control in space stations. It has high reliability, long life, large emission current, high current emission efficiency, and small size. Light weight, compact structure and strong anti-vibration ability. The hollow cathode is used as an electron source and is a single-point failure component of the electric thruster. It is of high importance and has a high life requirement, generally reaching tens of thousands of hours. [0003] The basic structure of the cathode is as figure 1 shown. The emitter is the part that actually emits electrons in the self-sustaining hollow cathode, usually made of low work function materials, such as LaB 6 , barium tungsten oxide, etc. These materials need to work at very hig...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01J1/13H01J1/20
Inventor 宁中喜安秉健于达仁孟天航黄超
Owner HARBIN INST OF TECH