活塞式单级制冷压缩机是我国开发研制较早的制冷机,早在二十世纪五、六十年代就已有批量生产,目前仍以价格低廉、维护方便等优势广泛应用于厂矿及民间各制冷环节,是制冷机品种产量较大的一种。活塞式制冷压缩机按其按压缩机气缸段数(级数)可分为:单段压缩机(单级)、双段压缩机(两级)、多段压缩机(多 Piston single-stage refrigeration compressor developed in our country earlier refrigerator, as early as the 1950s and 1960s have been mass production, is still low prices, easy maintenance and other advantages are widely used in factories and mines and civil Refrigeration, refrigeration is a larger variety of varieties. Piston refrigeration compressor press compressor cylinder according to its number of segments (series) can be divided into: single-stage compressor (single stage), two-stage compressor (two), multi-stage compressor