空间探测技术对小型低温制冷机提 出了在不同温区同时供冷的要求，而双级高频脉管制冷机则 是一种极具潜力的解决方案。介绍了一种热耦合双级高频 脉管制冷机，其两级冷指均采用同轴型结构以提升制冷机 结构的紧凑性。在室温惯性管调相的方式下，获得了22.03 K的 最低无负载温度；当总的输入电功为413 W时，两级可同时获 得8 W@80 K和1 W@30 K的制冷量。针对不同预冷温度下的性能特 性开展了实验研究，得到了低温级冷指效率的变化规律。

Space exploration missions require cryocoolers to provide cooling power in different temperature regions. The two-stage high frequency pulse tube cryocooler is a potential solution. A thermally coupled two-stage high frequency pulse tube cryocooler is presented. To improve the compactness, its two cold fingers are both shaped in coaxial type. The no-load temperature of 22.03 K is achieved in the phase shifting with only a room temperature inertance tube. For a total input electric power of 413 W, both 8 W@80 K and 1 W@30 K can be obtained at two stages. Experimental study is carried out for its cooling performance at different precooling temperatures. The changing rule of the efficiency of cold fingers at low temperature stages is obtained.