摘要
气动低温调节阀是大型氦低温系统中最重要的执行机构,工作在极低温状态下(液氢/液氦温区:20—4 K),低温漏热量是其最重要的技术参数之一。通过在低温阀外管焊接77 K热锚,可以有效降外管的漏热量损失。通过引入热力完善度,优化热锚在外管的相对位置,结果显示:热锚安装的最佳相对位置为0.40,此时外管在4 K温区相对漏热量损失减少了82.5%。
Pneumatic cryogenic valve is the most important executive actuator in large helium cryogenic system. It works at liquid hydrogen and helium temperature （20-4 K）. Heat loss is one of the most impor- tant technical parameters for cryogenic valve. It can be reduced effectively by brazing the thermal anchor to the body pipe at 77 K. By introducing the thermodynamic perfection degree, the relative position of the thermal anchor is optimized. The results shows that the optimal relative position is 0.40 and the heat loss of body pipe at 4 K is reduced by 82.5%.
出处
《低温工程》
CAS
CSCD
北大核心
2017年第1期17-20,共4页
Cryogenics
基金
国家自然科学基金项目(51406218)
浙江省博士后科研项目(BSH1502118)
关键词
低温阀
热锚
漏热
热力完善度
cryogenic valve
thermal anchor
heat loss
thermodynamic perfection degree
