高性能G-M型单级脉管制冷机研究

Investigation on High-Performance Single-Stage GM-Type Pulse Tube Cooler

从直流抑制角度出发 ,开展了高性能 G-M型单级脉管制冷机的研究。在对各种直流抑制方式进行比较的基础上 ,利用双向进气阀流量系数的方向性 ,采用两个并联排列、指示箭头方向相反的阀门 ,称之为并联逆向双阀双向进气结构对直流进行抑制 ,成功地解决了传统单阀双向进气结构脉管制冷机的直流问题。在 2 k W( RW2 )和 4k W( CP40 0 0 )压缩机驱动时分别获得了 1 8.4K和 1 4.7K的最低制冷温度 ,对应在 3 0 K的制冷量为 1 1 .5 W和 2 9.5 W,这些都是目前单级脉管制冷机公开报道的最好结果。

Experimental investigation on DC flow suppression and refrigeration characteristics of a high-performance single-stage GM-type pulse tube cooler has been undertaken. The influence of DC flow induced by the introduction of double-inlet on the refrigeration performance of the cooler is experimentally examined. Two parallel-placed needle valves with opposite flow direction called double-valved configuration, instead of conventional single-valved configuration as the double-inlet is successfully used in this experiment to reduce the DC flow. With a double-valved configuration, 18.4 K and 14.7 K (minimum temperature) are reached driven by RW2 and CP4000 compressor, respectively, and 11.5 W and 29.5 W (cooling power) at 30 K are obtained as well.