对活塞式制冷压缩机工作过程进行了数值模拟,建立了活塞与汽缸迷宫密封的数学模型,分析了泄漏量随活塞与汽缸间隙及迷宫槽间距变化的关系. The working process of piston refrigeration compressor was numerically simulated. The mathematical model of the piston and cylinder labyrinth seal was established. The relationship between the leakage and the piston clearance, cylinder gap and labyrinth gap was analyzed.