利用主动活塞调相的双温区脉管制冷机环境适应性研究

Environmental Adaptability of Dual Temperature Zones Pulse Tube Refrigerator With Active Piston Phase Shifter

为满足双温区制冷需求,通过单压缩机驱动80 K和40 K双温区冷指,且双冷指均采用主动调相器调节冷指内相位差分布,可在实现制冷机轻量化的同时,在双温区高效率制冷。本文基于双温区主动调相脉管制冷机,在制冷机环境温度和调相器相位差发生变化时,分别从制冷机内双冷指声功分配、回热器冷端相位差和制冷量变化特性的角度,开展了数值计算分析和实验验证研究。研究结果表明,制冷机在环境温度变化时,通过主动调节调相器活塞运动相位差,双温区冷指能够保持高效率制冷,实现制冷机对环境温度的主动适应。

In order to meet the cooling requirements of dual temperature zones,a single compressor is used to drive 80 K and 40 K dual temperature zone cold fingers.Moreover,the dual cold fingers adopt the active phase shifter to adjust the phase difference distribution in the cold fingers.The refrigerator can achieve high-efficiency cooling in dual temperature zones with lightweight.This paper is based on the dual cooling temperature zones pulse tube refrigerator with active phase shifters.Numerical computational analyses and experimental verification studies were carried out from the characteristics of the acoustic power distribution into dual cold fingers,phase difference at the regenerator cold ends,and cooling capacity variations.The study results show that by actively adjusting the phase difference of the phase shifter piston when the ambient temperature changes,the refrigerator can maintain high-efficiency cooling and achieve active environment temperature adaptation.