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Stirling型脉管制冷机比G-M型脉管制冷机具有更紧凑的结构和更高的制冷效率,已经成为低温制冷机领域的研究热点.为了获得低于20K的无负荷制冷温度,设计建立了一台热耦合二级Stirling型脉管制冷机.热耦合级间布置方式使得各级制冷机内的工质流动相互独立,便于小孔阀和双向进气阀调相结构的优化调节,有利于实现系统内直流流动的有效控制,级间制冷量的分配也更为灵活.采用一台线性压缩机驱动该制冷机,在200W输入电功率条件下,实现了14.97K的无负荷制冷温度.采用两台线性压缩机分别驱动第一级和第二级脉管制冷机,在400W总输入电功率条件下,获得了12.96K的低温,为目前国内外公开报道采用二级Stirling型脉管制冷机获得的最低制冷温度.
Stirling pulse tube chiller has more compact structure and higher cooling efficiency than GM pulse tube chiller, and has become a research hotspot in the field of cryogenic chillers.In order to obtain no-load chilling temperature below 20K, a Stage heat-coupled Stirling-type pulse tube refrigerator.The arrangement of the thermal coupling stages makes the working fluid flow in each level of the refrigerator independent from each other, which facilitates the optimal adjustment of the phase modulation structure of the orifice valve and the two-way inlet valve, The system of DC flow control effectively, interstage cooling capacity distribution is more flexible.Using a linear compressor to drive the refrigerator, the input power of 200W under the conditions to achieve a no-load refrigeration temperature of 14.97K using two Linear compressor drives the first stage and the second stage pulse tube refrigerator, respectively. Under the condition of 400W total input electric power, the low temperature of 12.96K is obtained, which is the lowest reported at present both at home and abroad with the two-stage Stirling pulse tube refrigerator Refrigeration temperature.