单压缩机驱动双冷指阻抗特性研究

Investigation on Impedance Character of Two Cold Fingers Driven by One Compressor

本文搭建了单压缩机驱动两台同轴型脉管冷指的实验台,对两冷指声功分配进行理论分析,在不改变冷指制冷效率的前提下可以通过调节冷指进气连管的长度来调节阻抗,以此调节压缩机出口声功重新分配;同时还研究了单压缩机驱动下两冷指运行工况改变时的相互影响,指出一侧冷指工况变化,造成系统内工质气体物性变化,进而改变冷指阻抗,最终对压缩机出口声功在两冷指之间进行重新分配。

In this paper, the experiment device of two coaxial pulse tube cold fingers driven by one compressor is presented. Then, the distribution of acoustic power of two cold fingers is analyzed theoretically. So we can adjust the impedance of cold fingers to redistribute the acoustic power of compressor by changing the length of connecting tube and keeping the cooling efficiency of cold finger constant. Interaction of two cold fingers＇ cooling performance is also researched. Changing one cold finger＇s heat lift may change the thermo-properties of working gas, which will change the impedance of cold finger, therefore, the cooling performance of another cold finger changes via the redistribution of acoustic power.