A compressor is a kind of fluid machinery that makes low-pressure gas into high-pressure gas. It is the heart of the refrigeration system. It breaths in low-temperature and low-pressure refrigerant gas from the suction tube, compresses the gas through a motor run driving piston, discharges high- temperature and high -pressure refrigerant gas to the exhaust pipe, provides power for refrigeration cycle , so as to realize the refrigeration cycle: compression, condensation, expansion and evaporation (heat absorption).
The function of counter used in the compressor is to monitor the motion frequency of piston.