Compressor refrigeration system, the core device, it is only through electrical energy into mechanical power, the low-temperature low-pressure refrigerant gas compressed into high-temperature high-pressure gas, in order to ensure cooling cycle. According to the external structure is divided into: 1. Closed: cooling capacity of less than 60KW, used for air conditioners and small refrigeration equipment. Drive motor and moving parts enclosed in the same space, compact structure, good sealing, low-noise sound. But less power, easy maintenance. 2. Semi-closed: cooling capacity 60 ~ 600KW, can be used for a variety of air-conditioning ﹑ refrigeration equipment. By crankcase housing and motor body together constitute an enclosed space, long stable life, greater cooling capacity can be used for a variety of conditions, maintainability, but slightly impatient voice. Divided into single-stage compression type (conventional type, butterfly valve type, unloading type, connectivity type) and two-stage compression type. ﹑ For a variety of air-conditioning refrigeration equipment. 3. Scroll rotor type: Cooling capacity 8 ~ 12KW, and more for small air conditioners and refrigeration equipment, is fully enclosed, compact structure, good sealing, low-noise sound. But less power, fully enclosed, simple compact, high performance, good sealing, low-noise sound, leading models for the future. Common brands: virtue COPELAND Copeland, France MANEUROP MANEUROP, Japan HITACHI Hitachi, Daikin DAKIN ﹑ ﹑ ﹑ NATIONAL Panasonic Sanyo SANYO, China Chunlan ﹑ ﹑ Meizhi Gree.