The compressor unit is the main equipment of the freezing processing and cold chain industry. It consists of compressor, pressure vessel, refrigeration element, electrical control and various valve parts. Main components of compressor units cooperate with domestic and abroad well-known brand, according to user configuration to type compressor units and engineering demand, in the form are: single and double screw parallel unit, double screw parallel units, inverter screw units, piston compressor and refrigerant special refrigeration unit.