【摘要】 2 K温区复合制冷系统在超导单光子探测、深空探测等特殊领域中具有独特应用。基于此，本文开展了空间应用型复合制冷系统的理论和实验研究，特别针对其多级直流线性压缩机系统。通过建立压缩机模型，对直流压缩机的动态特性参数以及多级压缩机串联后的动态特性进行分析和优化。所研制的四级直流线性压缩机系统与J-T系统、多级脉管制冷机系统耦合后，采用氦-4工质获得最低2.13 K的制冷温度，多级压缩机高低压压比达到100以上。更多还原

【Abstract】 The 2 K hybrid cooling system has special advantages in applications such as superconducting single photon detector and deep space exploration. In this paper, theoretical and experimental investigations on the space use hybrid cooling system were conducted, especially on its multi-stage linear compressor unit. Through establishing the linear compressor model, analyses and optimizations on the dynamic characteristics of the DC linear compressor and those of the composed multi-stage compressor unit were also put forward. Once coupled with the J-T system and multi-stage pulse tube cryocooler, a lowest temperature of 2.13 K was obtained with helium-4 as the working gas, and the corresponding pressure ratio reaches 100 above.更多还原