液氦温区脉管制冷机的频率特性  

FREQUENCY CHARACTERISTICS OF A 4 K PULSE TUBE COOLER

作　　者：邱利民[1] G.Thummes 

机构地区：[1]浙江大学制冷与低温工程研究所 [2]德国吉森大学应用物理研究所

出　　处：《低温工程》2001年第6期13-20,共8页Cryogenics

基　　金：德国科学研究技术部及中国教育部留学回国人员启动基金资助

摘　　要：着重研究了操作频率对液氦温区脉管制冷机性能的影响 ,在实验和分析的基础上 ,明确了制冷温度、制冷量、制冷效率与工作频率之间的关系 ,并与 4KG M制冷机的情况进行比较 ,得出了一些有益的结论。通过频率优化 ,脉管制冷性能得以较大提高。在初步试验中 ,分别在 1 2Hz和 1 1Hz获得了 3 0W @70K ,50 0mW @4 2K以及 2 0W @65K ,590mW @4 2K的制冷量。同时还给出了脉管制冷温度稳定性的测试结果。试验结果表明 ,研制的脉管制冷机温度波动均小于同类商品型 4KGM制冷机及脉管制冷机。Frequency effects on the performance of a 4 K pulse tube cooler(PTC)have been extensively explored recently The cooling powers at the two stages are much improved by frequency optimization In the preliminary experiments cooling powers of 30 W@70 K,500mW@4 2 K at 1 2 Hz and 20 W@65 K,590 mW@4 2 K at 1 1 Hz are obtained,respectively The mechanism of frequency effect on the 4 K PTC is revealed Some conclusions are drawn,which are very helpful for further developments of not only pulse tube refrigerator but also other G M type cryocoolers Tests of temperature stability are also performed The temperature fluctuation at both stages with some cooling powers is much smaller than those of commercial products for 4 K GM coolers and 4 K PTCs

关 键 词：脉管制冷机 频率特性 液氦 制冷效率 温度波动 性能 制冷温度 制冷量 

分 类 号：TB651[一般工业技术—制冷工程]