Overview of refrigeration compressor classification
The compressor is the core equipment in the refrigeration system. Only by converting electrical energy into mechanical work and compressing low-temperature and low-pressure gaseous refrigerant into high-temperature and high-pressure gas can the refrigeration cycle be ensured.
I. Volumetric type: By changing the volume of the working chamber, the periodic intake of quantitative gas is compressed.
1. Reciprocating piston type: The working volume of the cylinder is changed by the reciprocating movement of the piston.
is divided into:
① Fully enclosed: The cooling capacity is less than 60KW, which is mostly used in air conditioners and small refrigeration equipment.
The drive motor and the moving parts are enclosed in the same space, with compact structure, good sealing and low noise. But the power is small and it is not easy to repair.
Common brands: Franco-American-Brazil Taikang, Franco-American-Brazil, Copeland, Bristol, Danfoss of Denmark, Embraq of Italy, Electrolux, Hitachi, Panasonic, Toshiba, Sanyo, Mitsubishi, DAKIN, Korea LG , China Chunlan and so on.
② Semi-closed: The cooling capacity is 60～600KW, which can be used in various air-conditioning and refrigeration equipment.
A confined space is formed by the crankcase body and the motor shell. It is stable in operation and has a long life and large cooling capacity. It can be used in a variety of working conditions and can be repaired, but the noise is slightly higher. Divided into single-stage compression type (conventional type, butterfly valve type, unloading type, connection type) and two-stage compression type.
Common brands: Virtue Copeland, De Bizel, Bock, Grasso, Italy Fujihao, Lai Fukang, Japan Mitsubishi, Hitachi, Sanyo, China Taizhou Xuemei, Dalian Bingshan, Nanjing Wuzhou, etc.
③ Open type
The compressor and the motor are two devices connected to the outside. The structure is complex and heavy, and the work is unstable, which has been almost eliminated.
2. Rotary type: The working volume of the cylinder is changed by the rotation of the rotating body.
Classified according to internal structure:
① Rolling rotor type: cooling capacity 8-12KW, mostly used in small air conditioners and refrigeration equipment.
is a fully enclosed, compact structure, good airtightness and low noise. But the power is small and it is not easy to repair.
Common brands: Japan's Mitsubishi, Hitachi, Panasonic, Sanyo, Toshiba, China Qing'an, Huangshi Dongbei, etc.
② Scroll type: The cooling capacity is 8～150KW, which can be used in various air conditioning and refrigeration equipment.
is a fully enclosed, simple and compact structure, high performance, good airtightness, and low noise. It will be the leading model in the future.
Common brands: Virtue Copeland, French-American Youle, Hitachi, Panasonic, Daikin, Sanyo, China Chunlan, etc.
③ Screw type: The cooling capacity is 100～1200KW, which can be used in large and medium-sized air conditioners and refrigeration equipment.
is semi-enclosed, compact structure, high performance, large refrigeration capacity and stepless adjustment, but the lubricating oil system is more complicated and the noise is higher. Divided into single and twin screw type.
Common brands: De Bizel, Grasso, Italy Fujihao, Lai Fukang, Doring, Japan Hitachi, Daikin, Mitsubishi Heavy Industries, Kobelco, South Korea, foreign countries, Taiwan Fusheng, Hanzhong, China Chongqing Jialing, Dalian Bingshan, etc. .
II. Centrifugal: Relying on the centrifugal force to continuously compress the inhaled gas.
The maximum cooling capacity can reach 30000KW, which is used in large air-conditioning and refrigeration equipment.
Stable work, high performance, long life, large cooling capacity, and stepless adjustment.
Common brands: American TRANE Trane, CARRIER, YORK York and MCQUAY McQuay, Japan MITSUBISHI Mitsubishi Heavy Industries, Hitachi and EBARA, Switzerland SULZER, South Korea and Chinese manufacturers.
