Rotary Vane Compressor: Definition, Working Principle, Application, Advantages [Notes with PDF]

Rotary Vane Compressor was invented by Charles C. Barnes of Sackville, New Brunswick, who patented it on 16 June 1874.

What is Rotary Vane Compressor?

A rotary vane compressor always compresses the gas to the design pressure defined by the manufacturer, regardless of the pressure in the system in which the compressor is discharging.

This is a positive-displacement pump that consists of vanes mounted to a rotor that rotates inside a cavity.

The vane-type compressor consists of a cylindrical rotor with longitudinal slots in which radial sliding vanes are fitted.

The rotor is positioned eccentrically within a cylindrical housing.

The spaces between adjacent vanes form pockets of decreasing volume from a fixed inlet port to a fixed discharge port.

Compressor inlet and discharge valves are not employed in the design.

Rotary Vane Compressor Working principle:

Rotary Vane compressor
Rotary Vane compressor

Rotary compressors are another type of famous compressor. It uses two Asymmetrical rotors that are also called helical screws to compress the air.

The rotors have a very special shape and they turn in opposite directions with very little clearance between them.

The rotors are covered by cooling jackets. Two shafts on the rotors have been placed that transfer their motion with the help of timing gears that are attached at the starting point of the shafts/compressor (as shown in the image).

Air sucked in at one end and gets trapped between the rotors and gets pushed to another side of the rotors.

The air is pushed by the rotors that are rotating in the opposite direction and compression is done when it gets trapped in clearance between the two rotors. Then it pushed towards the pressure side.

Rotary screw compressors are of two types oil-injected and oil-free. Oil-injected is cheaper and most common than oil-free rotary screw compressors.

Rotary Vane Compressor Application:

The following application of rotary vane compressor are:

  • Agriculture
  • Body shop and Automotives
  • Dry cleaning
  • Energy
  • Food and beverages
  • Manufacturing
  • Medical and Dental.

Rotary vane Compressor Advantages:

The following advantages of rotary vane compressor are:

  • This is oil-free air output.
  • This is suitable for continuous air supplied.
  • High power (up to 500 hp) high pressure (up to 85 bar) compression is possible.

Rotary Vane Compressor Disadvantages:

The following disadvantages of rotary vane compressor are:

  • The maintenance cost is high because have more moving parts.
  • Vibration causes when reciprocation of the cylinder.

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Anup Kumar Dey

A Mechanical Engineer with 19 years of working experience in various renowned MNCs.

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