What is compressor? What is function of compressors

Compressor is a Machine which draws Air or Gas and discharges it under high pressure.

Function of Centrifugal Compressor:

Centrifugal compressors accelerates the velocity of the gases (increases kinetic energy) which is then converted in to pressure as the gas flow leaves the volute and enters the discharge pipe.

Gas that enters the compressors is swept by the vanes and is moved from the centre to outside by the centrifugal force. This action increases the velocity of the gas. Then it enters in to the volute where it gradually slows down as the chamber widens. As the gas slows down, the velocity or kinetic energy is converted in to pressure energy.

Deliver much higher flow rates than positive displacement compressors.

Function of Axial Compressor:

The rotor blades are used to push gas through the compressor stator blades. The position of the blades cause the gas to change direction. This creates resistance that cause the gas to slowdown and this action increases the pressure.

Axial Compressors can be used to generate very high gas flow rates.

Function of Rotary Screw Compressor:

It operates with two helical rotors that rotate toward each other, causing the teeth to mesh. As the left rotor turns clockwise, the right rotor rotates counter clockwise. This forces the gases to become trapped in the centre cavity. The two rotors are attached to a drive shaft and drive that provide energy to operate the compressor.

Screw compressors can be used to generate continuous gas flow.

 

Function of Reciprocating Compressor:

Reciprocating compressor is work by trapping and compressing specific volumes of gas between a piston and a cylinder wall. The back and forth motion incorporated by a reciprocating compressor pulls gas in on the suction (or intake) stroke and discharges it on the outlet. Spring loaded suction and discharge valves open/close automatically as the piston moves up and down in the cylinder chamber.

Reciprocating Compressors can be used to generate very high gas pressure.