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Novel hollow cathode heater structure

A hollow cathode and heater technology, applied in the aerospace field, can solve the problems of short circuit, open circuit, and easy induction current of the heating wire, so as to avoid falling off, facilitate reliable fixing, and improve reliability

Active Publication Date: 2019-04-05
SHANGHAI INST OF SPACE PROPULSION
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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 solve the problem that the existing heater structure is easy to cause short circuit and open circuit of the heating wire, and easy to generate induced current, thus affecting the reliable ignition and starting of the hollow cathode, and provides a new type of heater with simple structure, easy assembly and high reliability. heater structure

Method used

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  • Novel hollow cathode heater structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] like figure 1 As shown, a new hollow cathode heater structure is composed of ceramic skeleton, heating wire and outer ceramic. The ceramic frame is nested outside the cathode tube of the hollow cathode, close to the top of the cathode tube. There is a radial spiral groove on the outside of the ceramic frame; the heating wire is spirally inserted into the spiral groove; the outer ceramic is tightly fitted. Outside the ceramic skeleton, the heating wire is effectively confined within the helical groove.

[0019] The groove on the outside of the ceramic skeleton is a double helix groove. The pitch of the double helix is ​​the same. The specific pitch value can be determined according to the actual hollow cathode requirements. The cross-sectional structure of the groove is a semicircle at the bottom and a rectangle at the top. Heating wire.

[0020] The heating wire is inserted into the spiral groove of the ceramic frame in a double helix manner. Both ends of the heating ...

Embodiment 2

[0022] like figure 2 As shown, a new hollow cathode heater structure is composed of ceramic skeleton, heating wire and outer ceramic. The ceramic frame is nested outside the cathode tube of the hollow cathode, close to the top of the cathode tube. There is a radial spiral groove on the outside of the ceramic frame; the heating wire is spirally inserted into the spiral groove; the outer ceramic is tightly fitted. Outside the ceramic skeleton, the heating wire is effectively confined within the helical groove.

[0023] The groove on the outside of the ceramic skeleton is a double helix groove. The pitch of the double helix is ​​the same. The specific pitch value can be determined according to the actual hollow cathode requirements. The cross-sectional structure of the groove is rectangular, and the groove size must completely accommodate the heating wire.

[0024] The heating wire is inserted into the spiral groove of the ceramic frame in a double helix manner. Both ends of th...

Embodiment 3

[0026] like image 3 As shown, a new hollow cathode heater structure is composed of ceramic skeleton, heating wire and outer ceramic. The ceramic frame is nested outside the cathode tube of the hollow cathode, close to the top of the cathode tube. There is a radial spiral groove on the outside of the ceramic frame; the heating wire is spirally inserted into the spiral groove; the outer ceramic is tightly fitted. Outside the ceramic skeleton, the heating wire is effectively confined within the helical groove.

[0027] The groove on the outside of the ceramic skeleton is a double helix groove. The pitch of the double helix is ​​the same. The specific pitch value can be determined according to the actual hollow cathode requirements. The cross-sectional structure of the groove is a rectangular dovetail groove structure, and the groove size must completely accommodate the heating wire.

[0028] The heating wire is inserted into the spiral groove of the ceramic frame in a double he...

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Abstract

The invention discloses a novel hollow cathode heater structure. The novel hollow cathode heater structure is composed of a ceramic framework, a heating wire and an outer ceramic sleeve, and the ceramic framework is embedded outside a cathode tube of a hollow cathode and is close to the top end of the cathode tube. A radial spiral groove is formed in the outer side of the ceramic framework. The heating wire is spirally sleeved in the spiral groove and arranged between the outer ceramic sleeve and the ceramic framework, and the two ends of the heating wire are led out from the inner side end ofthe ceramic framework; And the ceramic framework is sleeved with the outer sleeve ceramic in a tight fit mode, and the heating wire is effectively limited in the spiral groove. The hollow cathode heater is simple in structure, high in reliability and capable of effectively restraining induced current interference and reducing electromagnetic oscillation and can be used for heating and ignition starting of the hollow cathode for space electric propulsion.

Description

technical field [0001] The invention belongs to the aerospace field and relates to a novel hollow cathode heater structure. Background technique [0002] Electric propulsion, represented by Hall thrusters and ion thrusters, has the advantage of higher specific impulse than chemical propulsion, and has been widely used in spacecraft to perform tasks such as position maintenance, orbit elevation, and deep space exploration main propulsion. As a key component of Hall thrusters and ion thrusters, hollow cathodes have a direct impact on the performance and reliability of ignition and start-up of electric thrusters. [0003] Before the hollow cathode is ignited, it is necessary to start the heater first, and use the heater to heat the emitter inside the cathode tube to the working temperature (generally 1100 ℃ ~ 1600 ℃), and the emitter will generate enough thermally induced electron emission, and the emitted electrons and The propellant gas atoms entering the cavity of the hollo...

Claims

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Application Information

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IPC IPC(8): H01J1/02F03H1/00
CPCF03H1/0031H01J1/025
Inventor 张岩乔彩霞康小录王亚楠程佳兵余水淋王仲远
Owner SHANGHAI INST OF SPACE PROPULSION
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