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提高液氦温区脉管制冷机的制冷量对于冷却超导磁体和氦液化具有重要意义。本文将已成功应用于单级脉管制冷机和4 K G-M制冷机模拟的回热器模拟软件REGEN用于液氦温区脉管制冷机二级回热器的模拟。计算结果显示,脉管制冷机在4.2 K的制冷量一定程度上随着二级质量流量的增加而增大。在此基础上,我们在实验中采用不同质量流量的压缩机对第二级进行驱动以对计算结果进行验证。实验结果与计算结果基本吻合。在用单台6.8 kW压缩机同时对第一级和第二级驱动时,制冷机在第一级和第二级分别有20 W@40 K和0 7 W@4.2 K的制冷量。改用双压缩机和双旋转阀分别驱动第一级和第二级(第一级:CP4000,第二级:CP6000),在制冷机第一级和第二级分别获得20 W@47.5 K和1 1 W@4.2 K的制冷量,总输入电功率为11.7 kW。这是目前分离型二级脉管制冷机获得的最大制冷量。
Improving the refrigeration capacity of pulse tube refrigerator in liquid helium is of great significance for cooling superconducting magnets and helium liquefaction. This article has been successfully applied to single-stage pulse tube refrigerator and 4 K G-M refrigerator simulation of regenerator simulation software REGEN for the helium temperature zone pulse tube refrigerator secondary regenerator simulation. The calculation results show that the refrigeration capacity of the pulse tube refrigerator increases with the increase of the second-order mass flow at 4.2 K. Based on this, we used the compressors of different mass flow in the experiment to drive the second stage to verify the calculation results. The experimental results are consistent with the calculated results. The refrigerator has 20 W @ 40 K and 0 7 W @ 4.2 K cooling capacity at the first and second stages, respectively, when driven simultaneously with the first and second stages by a single 6.8 kW compressor. The first stage and the second stage are driven by double compressors and double rotary valves respectively (first stage: CP4000, second stage: CP6000), 20 W@47.5 K and 1 1 W@4.2 K cooling capacity, the total input electrical power of 11.7 kW. This is the maximum cooling capacity currently obtained for a separable two-stage pulse tube refrigerator.