Rotary vane compressor

Rotary vane compressor

Rotary vane compressor utilize one of the oldest Compressor technologies.they consists rotor with a number of blades inserted in radials slots in the rotor.
The rotor is mounted offset in a larger housing that is either circular or a more complex shape.As the rotors turns,blades slide in and out of the slots keeping contact with the outer wall of the housing.thus a series of decreasing volume is created by rotating blades.they can be either stationary or portable,can be single or multistage and can be driven by electric motors or internal combustion engines.they are well suited to electric motor drive.

                    Image source-pumpschool by Google.com

Principle:-

• It is based on the principle of backflow of air. at first air is compressed and then by using backflow of air.

Construction:-

• It consist of a rotar rotating eccentrically in an air-tight casing with an inlet and outlet ports.
• This rotar consit of number of games which is spring loaded system.the disc type structure rotates then the vanes start pressed against the wall of the casing  due to spring forces.

Working:-

• When the rotors start rotating the vanes are now pressed against the wall of the casing due to centrifugal force inside the casing form  air-tight pockets.
• As the rotors rotates continuously then compression of of air takes due to decreased in volume for the entrapped air.
• And some amount of Compression is done by the backflow of air from the receiver.
• After that when the rotating vane uncovers the exit port and compressed air enters into the receiver,then at the same time some air under high pressure flows back into the pocket.
• Thus the pressure of air, entrapped in the air tight pockets,is increased first by decreasing the volume and then by the backflow of air.
• After that the compressed air is delivered to the receiver by the rotation of the vanes and this pressurized air gets stored in the receiver.

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