液氦温区分离型二级脉管制冷机的实验研讨.pdf

液氦温区分离型二级脉管制冷机的实验研究 何永林邱利民甘智华卢 杰 (浙江大学制冷与低温研究所，杭州310027) 摘要本文研制了新型液氦温区分离型二级脉管制冷机。该制冷机由两台独立的脉管制冷机组成，一级 回热器冷端和二级回热器中部通过热桥相连，从根本上弥补了传统直接耦合型多级脉管制冷机级间干扰的 3．8 不足。在没有热桥连接的情况下，单独测试第一级最低制冷温度达到1 K，这是单级脉管制冷机获得的 最低制冷温度新纪录。采用双压缩机双旋转阀驱动该二级脉管制冷机，第二级最低温度达到了2．5K，在 旋转阀驱动，该制冷机达到了相同的制冷性能。 关键词液氦脉管分离型 INVESTIGATIONONASEPARATE TWO—STAGEPULSETUBECOOLER WORKINGAT 4．2K He Jie Yonglin，QiuLimin，Gan Zhihua，Lu of and (Institute 31 RefrigerationCryogenics，Zhejiang 0027) University,Hangzhou AbstractAhovel4 K tubecoolerwas and tothe separatetwo-stagepulse designed traditional4K 4K tubecoolerconsists tube cryocoolers，the oftwo coolers， separatepulse independentpulse whichare connectedbetweenthecoldendofthe ofthesecond first andsomemiddle thermally stage position lowestno-load of1 3．8Khasbeenobtainedforthefirst withoutthermal stageregenerator．A temperature stage isa newrecordforthe withtwo connector,which tubecooler．Driventwo single—stagepulse by compressors rotaryvalves，acooling of2．5Kforthesecondwas of508mWat temperature stage obtained．