Type and principle
There are many types of air compressors. According to the working principle, they can be divided into volumetric compressors, speed compressors, and volumetric compressors. The working principle of compressed air is to increase the density of gas molecules per unit volume to increase the compressed air. Pressure; the working principle of the speed compressor is to increase the speed of movement 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.
Commonly used air compressors for piston air compressors include piston air compressors and screw air compressors (screw air compressors are further divided into twin screw air compressors and single screw air compressors); centrifugal compressors And a vane air compressor; a scroll air compressor. The following are definitions of various compressors. Compressors such as cam type, diaphragm type and diffusion pump are not included because they are special in use and relatively small in size.
Positive displacement compressors - compressors that rely directly on changing the gas volume to increase the gas pressure.
Reciprocating Compressor - is a positive displacement compressor whose compression element is a piston that reciprocates within the cylinder.
Rotary Compressor - is a positive displacement compressor, compression is achieved by the forced movement of the rotating element.
The vane type compressor is a rotary type variable displacement compressor whose axial sliding piece slides radially on the rotor which is eccentric with the cylindrical cylinder. The air trapped between the slides is compressed and discharged.
A liquid-piston compressor is a rotary positive displacement compressor in which water or other liquid acts as a piston to compress a gas and then discharge the gas.
The Roots double-rotor compressor is a rotary positive displacement compressor in which two Roots rotors mesh with each other to intercept the gas and send it from the air inlet to the exhaust port. There is no internal compression.
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The screw compressor-- is a rotary positive displacement compressor in which two rotors with helical gears mesh with each other, so that the volume of the two rotor meshes is reduced from large to large, thereby compressing and discharging the gas.
Speed ​​Compressor - is a rotary continuous flow compressor in which a blade that rotates at a high speed accelerates the gas passing through it, thereby converting the velocity energy into pressure. This conversion occurs on the rotating blades and partly on a fixed diffuser or return baffle. "Q & A of the operation and maintenance technology of screw air compressor" can be found in the book of China Electric Power Press.
Centrifugal Compressor - A speed type compressor in which one or more rotating impellers (the blades are usually on the side) accelerate the gas. The main air flow is radial.
An axial compressor - a speed type compressor in which gas is accelerated by a rotor equipped with blades. The main air flow is axial.
Hybrid Flow Compressor - Also a speed type compressor, the shape of the rotor combines some of the characteristics of both centrifugal and axial flow.
Jet Compressor - Takes away the inhaled gas with a high velocity gas or steam jet and then converts the velocity of the mixed gas to pressure on a diffuser.
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