电真空器件在轨加电时腔体压力变化分析*

doi:10.13385/j.cnki.vacuum.2020.03.13

Abstract

Abstract: For space applications, the power-on process of a vacuum electronic device is influenced by the interactions of its electrical, thermal and pressure properties. In some cases, such devices fail to switch on normally at the first time of power-on. This paper analyzed the pumping mechanism of the heating cylinder for a vacuum electronic device and established the pressure change model within the cylinder. It is determined that the primary influences are the diameter of the outlet channel of the heating cable and the inner material outgassing of the heating cavity. On this basis, simulation tests for assessing the amount of material outgassing and iterative calculation of the pressure variation in the cavity for typical vacuum electronic product were conducted. The results show that the significant increase of the outgassing rate from the interior of the cavity and the uncertainty of the diameter of the outlet channel of the heating cable are the main reasons for the occasionally failure of this type of device to power on at the beginning.

Key words: vacuum electronic device, pressure change, pumping process analysis, in-orbit power on

CLC Number:

TB75

CHEN Lian, DONG Meng, LIU Guo-ting, ZHAO Lan, ZHANG Rui-fang, LI Ya-li, SUN Dong-hua, Zhang Rui-nian, CHENG Yong-jun. Analysis of Cavity Pressure Change for a Vacuum Electronic Device During in-Orbit Power-on[J].VACUUM, 2020, 57(3): 61-66.

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Analysis of Cavity Pressure Change for a Vacuum Electronic Device During in-Orbit Power-on

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