There are many types of gas compressors, which can be divided into positive displacement compressors and speed compressors according to their working principles. The working principle of a positive displacement compressor is to compress the volume of gas and increase the density of gas molecules per unit volume to increase the pressure of the compressed air; The working principle of the speed compressor is to increase the movement speed of the gas molecules, so that the kinetic energy of the gas molecules is converted into the pressure energy of the gas, thereby increasing the pressure of the compressed air.
The commonly used gas compressors now include piston air compressors, screw air compressors (screw air compressors are divided into twin screw air compressors and single screw air compressors), centrifugal compressors, sliding vane air compressors and scroll air compressor. The following is the definition of various compressors. Compressors such as cam type, diaphragm type and diffusion pump are not included because of their special purpose and relatively small size.
Positive displacement compressor: A compressor that directly relies on changing the gas volume to increase the gas pressure.
Reciprocating compressor: It is a positive displacement compressor, and its compression element is a piston that reciprocates in the cylinder.
Rotary compressor: It is a positive displacement compressor. Compression is achieved by the forced movement of rotating elements.
Sliding vane compressor: It is a rotary variable capacity compressor. Its axial sliding vane slides radially on a rotor that is eccentric to the cylindrical cylinder. The air trapped between the sliding plates is compressed and discharged.
Liquid-piston compressor: It is a rotary positive displacement compressor in which water or other liquid acts as a piston to compress gas and then discharge the gas.
Roots double-rotor compressor: It is a rotary positive displacement compressor without internal compression, in which two Roots rotors mesh with each other to intercept the gas and send it from the inlet to the outlet.
Screw compressor: It is a rotary positive displacement compressor in which two rotors with helical gears mesh with each other to compress and discharge gas.
Speed compressor: It is a rotary continuous air compressor, in which high-speed rotating blades accelerate the gas passing through it, thereby converting speed energy into pressure. This conversion occurs partly on the rotating blades and partly on the fixed diffuser or reflux baffle.
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