一般制冷机的制冷原理压缩机的作用是把工质由低温低压气体压缩成高温高压气体，再经过冷凝器，在冷凝器中冷凝成低温高压的液体，经节流阀节流后，则成为低温低压的液体。低温低压的液态工质送入蒸发器，在蒸发器中吸热蒸发而成为高温低压的蒸汽，从而完成制冷循环。

单级蒸汽压缩制冷系统，是由制冷压缩机、冷凝器、蒸发器和节流阀四个基本部件组成。它们之间用管道依次连接，形成一个密闭的系统，制冷剂在系统中不断地循环流动，发生状态变化，与外界进行热量交换

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