C波段制冷接收机充气系统  

Aerating System of C Band Cryogenic Receiver

作　　者：王凯[1,2] 李笑飞[1,2] 王洋[1,2] 闫浩[1,2] 项斌斌[1,2] 陈卯蒸[1,2] 马军[1,2] WANG Kai;LI Xiao-fei;WANG Yang;YAN Hao;XIANG Bin-bin;CHEN Mao-zheng;MA Jun(Xinjiang Astronomical Observatory,Chinese Academy of Sciences,Urumqi 830011,China;Key Laboratory of Radio Astronomy,Chinese Academy of Sciences,Nanjing 210008,China)

机构地区：[1]中国科学院新疆天文台,新疆乌鲁木齐830011 [2]中国科学院射电天文重点实验室,江苏南京210008

出　　处：《电子机械工程》2018年第5期1-4,13,共5页Electro-Mechanical Engineering

基　　金：国家重点基础研究发展计划(2015CB857100);国家自然科学基金资助项目(11603064;U1431230);中国科学院"西部之光"人才培养引进计划(2017-XBQNXZ-B-021);中国科学院天文台站设备更新及重大仪器设备运行专项经费资助项目

摘　　要：充气系统是给制冷接收机干空气腔体提供新鲜干燥空气、排出陈旧气体以防止水汽在真空窗表面遇冷凝结而影响观测的气动系统。某26 m射电望远镜C波段制冷接收机的馈源在杜瓦外部,故该接收机的充气系统将馈源设计为干空气腔体,通过充气机提供干燥空气,使用气体缓冲器作为辅助气源用于在充气机停止工作时补充提供干燥空气,以小的泄漏排出馈源腔体内的陈旧气体。该气动系统能很好地避免C波段制冷接收机真空窗口表面结冰,在自动控制下的充气系统也可以很好地补偿腔体内压的变化,使得整个充、排气过程更加稳定,真空窗口表面保持干燥。The aerating system is a pneumatic system which supplies fresh dry air to and vents old air from the dry air cavity,so it can avoid the vapor freezing on the vacuum window surface,which affects observation. The feed of C-band cryogenic receiver in a 26 m telescope is outside of the Dewar,so the feed of the aerating system is designed as a dry air cavity. The system uses an inflator to supply dry air and the air buffer as an auxiliary inflator to supply dry air when the inflator stops operation. It vents old air with small leakage. This aerating system can avoid vacuum window freezing very well and the pneumatic system can offset the pressure variation of feed cavity by automatic control. As a result,aerating and venting are carried out stably and the vacuum window keeps dry.

关 键 词：射电天文 制冷接收机 真空窗 气动控制 充气系统 

分 类 号：TH138[机械工程—机械制造及自动化]