摘要
给出了1.8 K常压超流氦低温系统的工作原理。对HeⅡ腔的漏热进行了分析和计算,包括环氧隔热板、安全阀、支撑杆以及测量线与电流引线底座同HeⅠ腔的导热,真空夹层之间的残余气体导热以及HeⅡ腔内杜瓦与其外周冷屏的辐射换热。根据漏热值,对所需真空泵的抽速进行了计算,同时给出了预冷与节流相结合获取1.75 K超流氦方案物理过程的温-熵图。
The operating principle of a 1.8 K-atmospheric super fluid helium cryogenic system was giv- en. The heat leak of the He Ⅱ chamber were analyzed and calculated, which including the epoxy insulating board, safety valve, support bars, measurement leads and current leads heat conduction with He Ⅰ cham- ber, residual gas heat conduction in vacuum between the layers, radiation heat transfer between the dewar of He Ⅱ chamber and cold shield. According to the result of heat leak, vacuum pump speed was calculated, temperature-entropy diagram of the process of throttling process accompanied with pre-cooling were put for- ward.
出处
《低温工程》
CAS
CSCD
北大核心
2013年第2期20-23,共4页
Cryogenics
基金
国家自然科学基金项目(No.51177163)
关键词
超流氦
低温系统
漏热
super fluid helium
cryogenic system
heat leak
