2026-04-09Views：
Types of air compressors There are many types of air compressors, which can be divided into positive displacement compressors, reciprocating compressors, and centrifugal compressors according to their working principles.
The working principle of the positive displacement compressor is to compress the volume of the gas, so that the density of the gas molecules per unit volume is increased to increase the pressure of the compressed air;
the working principle of the centrifugal compressor is to increase the 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 working principle of a reciprocating compressor (also called a piston compressor) is to directly compress the gas and discharge it when the gas reaches a certain pressure.
Now commonly used air compressor piston air compressor, screw air compressor, (screw air compressor is divided into twin screw air compressor and single screw air compressor), centrifugal compressor and sliding vane air compressor, scroll air compressor.
The following is the definition of various compressors. Compressors such as cam, diaphragm and diffusion pumps are not included because of their special use and relatively small size.
Positive displacement compressor-a compressor that directly depends on changing the gas volume to increase the gas pressure.
Reciprocating compressor-is a positive displacement compressor, the compression element is a piston, reciprocating in the cylinder. Rotary compressor-is a positive displacement compressor, compression is achieved by the forced movement of rotating elements.
Sliding vane compressor-is a rotary variable capacity compressor, and its axial sliding vane slides radially on the eccentric rotor of the same cylindrical cylinder. The air trapped between the slides is compressed and discharged.
Liquid-piston compressors-are rotary positive displacement compressors in which water or other liquid acts as a piston to compress the gas and then discharge the gas.
Roots twin rotor compressor-is a rotary positive displacement compressor in which two Roots rotors mesh with each other to trap the gas and send it from the inlet to the outlet. There is no internal compression.
Screw compressor-is a rotary displacement compressor in which two rotors with helical gears mesh with each other to compress and discharge gas.
Velocity compressor-is a rotary continuous flow compressor in which blades rotating at high speed accelerate the gas passing through it, thereby converting velocity energy into pressure. This conversion occurs partly on the rotating blades and partly on the stationary diffuser or reflux baffle.
Centrifugal compressor-a type of speed compressor in which one or more rotating impellers (blades usually on the sides) accelerate the gas. The primary air flow is radial.
Axial compressor-a speed compressor in which the gas is accelerated by a bladed rotor. The primary air flow is axial.
Mixed flow compressor-also a speed compressor, the shape of its rotor combines some of the characteristics of both centrifugal and axial flow.
Jet compressor-the use of high-speed gas or steam jet to carry away the suction gas, and then in the diffuser to convert the speed of the mixed gas into pressure.
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