Positive displacement compressors are mainly divided into the following four types: screw compressors, piston compressors, rolling rotor compressors, and scroll compressors.
1.Screw compression Since the 1970s, the working reliability of screw compressors has been continuously improved. Therefore, it has been widely used in refrigeration and air-conditioning projects in the range of medium refrigeration capacity, and relying on higher reliability and efficiency, successfully squeezed into The smaller refrigeration range (less than 750KW) dominated by the original piston compressor. 2. Piston compressor The piston compressor is still the most widely used model so far. Although its market share has been taken up by other types of compressors, in small refrigeration applications, the piston compressor will continue to expand its share. Market. 3. Rolling rotor compressor Rotor rotor compressors are now widely used in home appliance refrigerators and air conditioners, of which large and medium-sized roller rotor compressors are also used in cold storage. 4. Scroll compressor Scroll compressor is a new type of compressor developed in the 1980s. It is widely used in air conditioning and refrigeration units due to its high efficiency, small size, light weight, low noise, simple structure and balanced operation. Features of positive displacement compressor (1) The change of the machine speed has no direct effect on the change law of the working volume, so the pressure has little relationship with the flow rate, and the working stability is good; (2) The gas suction and discharge are not related to the nature of the gas, so it has strong adaptability and is easy to reach a higher pressure; (3) The machine has high thermal efficiency (because of less leakage); (4) The structure is complex and there are many reciprocating wearing parts; (5) The pulsation of gas is large, which may easily cause vibration of the gas column and pipeline.
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