气隙式热开关充压对转变温度的影响研究  

Study on the influence of charging pressure on transition temperature of gas-gap heat switch

作　　者：姚越峰 刘少帅[1] 蒋珍华[1,2] 吴亦农 潘小珊[1] Yao Yuefeng;Liu Shaoshuai;Jiang Zhenhua;Wu Yi’nong;Pan Xiaoshan(Shanghai Institute of Technical Physics,Chinese Academy of Sciences,Shanghai 200083,China;University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学院上海技术物理研究所,上海200083 [2]中国科学院大学,北京100049

出　　处：《低温与超导》2021年第4期11-17,共7页Cryogenics and Superconductivity

基　　金：国家自然科学基金(51806231);中国科学院战略性先导科技专项(B类)(XDB35000000);上海市自然科学基金(18ZR1445600);中国博士后科学基金(2018M630476)资助。

摘　　要：气隙式热开关是空间深低温系统应用中的关键技术,需针对氦介质气隙式热开关的转变温度特征开展研究。基于稀薄气体传热理论,建立了不同充气压力和间隙尺寸对热开关转变温度影响的计算模型,研究其影响规律并进行实验验证。研究结果表明,该气隙式热开关在导通状态(ON)在4至20 K的导热量为1.37 W(1 bar)和1.18 W(0.14 bar),断开状态(OFF)下的漏热为1.36 mW,开关比分别为1 007和867。通过改变常温氦气充气压力从1 bar至0.14 bar,热开关的转变温度提高2 K。Gas-gap heat switch is one of the key technologies in cryogenic system. Researches need to be done on the transition temperature of the helium gas-gap heat switch. Based on the rarefied gas heat transfer theory, the effect of different charging pressure and gap size on the transition temperature of thermal switch was analyzed theoretically and the tests of the performance of the heat switch were carried out. In the ON state(4 to 20 K), the thermal conductivity is 1.37 W(1 bar) and 1.18 W(0.14 bar);in the OFF state, the heat leakage is 1.36 mW, and the ON to OFF ratio is 1007 and 867, respectively. In addition, the transition temperature increases by 2 K when the charge pressure of helium is 0.14 bar at room temperature compared to which of 1 bar.

关 键 词：气隙式热开关 深低温4 K 转变温度 低温系统集成 

分 类 号：TB66[一般工业技术—制冷工程]