The compressor is a driven fluid machine that promotes low-pressure gas to high-pressure gas, and is the heart of the refrigeration system. It sucks in low-temperature and low-pressure refrigerant gas from the suction pipe, drives the piston to compress it through the operation of the motor, and discharges the high-temperature and high-pressure refrigerant gas to the exhaust pipe to provide power for the refrigeration cycle.

So as to realize the refrigeration cycle of compression→condensation (heat release)→expansion→evaporation (heat absorption). Compressors are divided into piston compressors, screw compressors, centrifugal compressors, linear compressors, etc. The entry introduces the compressor's working principle, classification, accessories, specifications, operating requirements, compressor production, common faults and environmental protection requirements, selection principles, installation conditions and development trends.