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本文建立了小孔型脉管制冷机实验台，通过测量制冷机中动态的压力、示功图、制冷温度和制冷量，研究了阀门开度对制冷过程的影响。多路旁通方案比常规小孔和双向进气方案获得更低的制冷温度，达到２３．８Ｋ，且Ｐ－Ｖ功最小。随着小孔开度增大，压缩腔和脉管中压力的相位差增大，压缩腔中压比增大，而脉管中压比减小，Ｐ－Ｖ功增大。双向进气阀和多路旁通阀开度的影响恰好与小孔的影响相反，有利于制冷过程。
In this paper, a small hole-type pulse tube refrigerator experimental set up, by measuring the dynamic pressure in the refrigerator, the thermoelectric diagram, refrigeration temperature and cooling capacity, the study of the valve opening on the cooling process. The multi-pass bypass scheme achieves a lower refrigeration temperature than conventional pinhole and bi-directional air admission schemes, reaching 23.8 K with minimal P-V work. As the opening of the orifice increases, the phase difference between the pressure in the compression chamber and the vessel increases, the pressure ratio in the compression chamber increases, and the pressure ratio in the vessel decreases and the P-V power increases. The effect of the two-way inlet valve and the multi-way bypass valve opening is exactly opposite to that of the small holes, which is good for the cooling process.