在建立了一套使用电磁阀控制ＧＭ型制冷机进、排气的软、硬件控制系统的基础上，成功地控制了双级ＧＭ型制冷机的进、排气动作。在实验的基础上指出，对于ＧＭ型制冷机而言，存在一定的最佳进、排气角度，这个最佳的进、排气角度对于不同的制冷机而言是不同的，并且制冷机性能受频率变化的影响也是非常大的。文章对此进行了初步的分析，为制冷机的理论分析和设计计算提供了有力的实验依据 Based on the establishment of a set of software and hardware control system that controls the intake and exhaust of GM refrigerating machines by using solenoid valves, the intake and exhaust operations of two-stage GM refrigerators are successfully controlled. On the basis of the experiment, it is pointed out that there is a certain optimal angle of intake and exhaust for the GM refrigerator, and this optimum angle of intake and exhaust is different for different refrigerators, and the performance of the refrigerator The impact of frequency changes is also very large. The article has carried on the preliminary analysis to this, has provided the effective experimental basis for the theoretical analysis and the design calculation of the refrigerating machine