电真空器件在轨加电时腔体压力变化分析  

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

作　　者：陈联[1] 董猛[1] 刘国庭 赵澜[1] 张瑞芳[1] 李亚丽 孙冬花[1] 张瑞年[1] 成永军[1] CHEN Lian;DONG Meng;LIU Guo-ting;ZHAO Lan;ZHANG Rui-fang;LI Ya-li;SUN Dong-hua;Zhang Rui-nian;CHENG Yong-jun(Science and Technology on Vacuum Technology and Physics Laboratory,Lanzhou Institute of Physics,Lanzhou 730000,China)

机构地区：[1]兰州空间技术物理研究所真空技术与物理重点实验室,甘肃兰州730000

出　　处：《真空》2020年第3期61-66,共6页Vacuum

基　　金：中国科学技术部国家重点研发计划项目(2018YFB2003700)。

摘　　要：针对空间用电真空器件在轨加电时会导致电、热和压力性能相互影响的问题,以某型号电真空器件加热筒首次加电时偶尔出现不能正常加电故障为背景,分析了电真空器件加热筒抽气机理及其主要影响因素,建立了加热筒腔体压力变化模型,确定加热电缆引出通道直径和腔体内部材料出气是其主要影响因素。在此基础上,开展了典型产品的腔体内部材料出气量模拟测试和腔体压力变化迭代计算。模拟测试和计算分析结果表明,加热筒首次加电时,腔体内部材料出气量的明显增加和加热电缆引出通道直径的不确定性,是导致电真空器件首次在轨加电过程中偶尔会发生不能正常加电故障的主要原因。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.

关 键 词：电真空器件 压力变化 抽气过程分析 在轨加电 

分 类 号：TB75[一般工业技术—真空技术]