分置式斯特林制冷机气动膨胀机阶梯轴振子运动特性研究

摘要

The vibrator in pneumatic expander of split-stirling cryocooler was analyzed and verified. With pneumatic rod area increases, vibrator's phase angle decreases, while stroke increases. The cooling capacity of Stepped-rod type was compared with direct-connected type's. The stepped-rod area rate will affect the matching of the expander to the compressor. The pressure ratio, phase angle and amplitude were considered to determine the area of the stepped-rod. The stepped-rod type expander’s wide frequency adapt characteristics is also analyzed.%对气动分置式膨胀机振子进行运动分析和实验验证，说明随气动杆面积增加，振子相角减小、振幅增加；将直连结构与气动杆结构制冷机性能进行对比，介绍了阶梯轴面积比会影响制冷机的压缩机和膨胀机匹配，实际研发中应结合压比、相角、振幅几方面确定阶梯轴面积；分析了阶梯轴结构膨胀机的宽频工作特性。