用非金属活塞环代替铸铁活塞环是提高气缸套-活塞环摩擦付寿命的有效途径。以高分子聚合物为基的活塞环比金属活塞环具有比重轻、减震性能好、耐磨性强等无可争辩的优点。特别是能很好地防止气缸磨损的这种耐磨性尤其重要。尽管如此,但非金属活塞环直到不久以前还没有在制冷压缩机中使用。在制冷压缩机中介质的化学活性强、温度高、活塞环承受交变热负荷的条件下,广泛采用非金属活塞环曾取决于能否成功地解决保证活塞环的寿命问题,以及研制生产廉价非金属活塞环所必需的工艺设备问题。在压缩机制造业中积累了采用以填充石墨 Replacing cast iron piston rings with non-metallic piston rings is an effective way to improve the friction life of cylinder liner-piston ring. Piston rings based on macromolecule polymers have the advantages of light weight, good damping performance and strong abrasion resistance than metal piston rings. This wear resistance, which is particularly good at preventing cylinder wear, is of particular importance. Nonetheless, non-metallic piston rings have not been used in refrigeration compressors until recently. The extensive use of non-metallic piston rings under the conditions of high chemical activity, high temperature of the medium in the refrigerant compressor, and the piston ring to withstand the alternating heat load has been dependent on the successful solution to the problem of ensuring the life of the piston rings, as well as the development and production of low-cost Non-metallic piston rings necessary process equipment issues. In the compressor manufacturing industry has been used to fill graphite