Using the step displacer in two stage pulse tube refrigerator has already been proved as a sufficient way to improve the efficiency. In this article, an experimental setup has been manufactured. A no-load temperature of 16.9K is achieved with a step displacer type gas-coupled pulse tube refrigerator filled with stainless steel mesh. The influence of the connecting tube between pulse tube hot end and displacer on the performance of the refrigerator is investigated. The experimental results show that the phase shifting ability can be adjusted by the connecting tube. The performance of the refrigerator can be optimized by this method. For different rod diameters, there is an optimum connecting tube ratio to get the lowest temperature.

已经证明在两级脉冲管制冷机中使用阶梯式移位器是提高效率的充分方法。在本文中，已经制造了实验装置。用装有不锈钢网的步进式气体耦合脉冲管制冷机可达到16.9K的空载温度。研究了脉冲管热端与置换器之间的连接管对冰箱性能的影响。实验结果表明，通过连接管可以调节相移能力。通过这种方法可以优化冰箱的性能。对于不同直径的杆，有一个最佳的连接管比率以获得最低的温度。