液氦温区多级脉管制冷机的双小孔效应及实验验证  

Double-orifice Effect and Experimental Verification of A Multi-stage Pulse Tube Refrigerator Reaching Liquid Helium Temperatures

作　　者：邱利民[1] 陈国邦[1] 郑建耀[1] 甘智华[1] 白煊[1] 颜鹏达[1] 金涛 黄志秀[1] 余建平[1] 

机构地区：[1]浙江大学制冷与低温研究所,杭州310027

出　　处：《低温与超导》1997年第1期1-6,共6页Cryogenics and Superconductivity

基　　金：国家自然科学基金

摘　　要：介绍了自行研制的用于多级脉管制冷机的新颖相移器──—双小孔结构，着重分析了双小孔的工作机理，指出双小孔结构有利于增大当级小孔的调相功能，强化低温级的泵热能力。同时针对多级脉管制冷机中的双小孔效应进行了实验验证，经反复实验，采用双小孔结构的二级脉管制冷机第一级和第二级的最低制冷温度分别达到46K和3.0K。To reach liquid helium temperatures using a staged pulse tube, it is recommendable to use a much improved phase shifter to increase regenerator performance and to decrease pulse tube losses. The double orifice configuration developed in this paper could be used to enhance the phase shifting effect. This paper also describes the basic structure of a two-stage pulse tube refrigerator. The machine was driven by a valved compressor and the on-off timing was controlled by a computer and solenoids. The lowest temperature of 3.0 K at the cold end of thesecond stage was achieved

关 键 词：相移器 制冷机 脉管制冷机 

分 类 号：TB651[一般工业技术—制冷工程]