一、引言G—M 循环制冷机是一种无功膨胀热排出器型制冷机。也就是它对外不作功,但排气焓值高于进气焓值,因而达热平衡后必有一可输出冷量的冷端,以冷却某些在低温下工作的元件。图1是 G—M 循环膨胀机原理示意图。活塞1内装一蓄冷器并通过外部传动机构往 I. Introduction G-M cycle refrigerator is a reactive expansion heat ejector type refrigerator. That is, it does not work externally, but the enthalpy of the exhaust gas is higher than that of the enthalpy of intake. Therefore, there must be a cold end capable of outputting cold after the thermal equilibrium so as to cool some of the components that work at a low temperature. Figure 1 is a G-M cycle expander schematic diagram. Piston 1 built a regenerator and through the external transmission mechanism