3.2.5. Rotary vane compressor


Fig. 3.10: Symbol for rotary vane compressor
The rotary vane compressor (lamellar or rotary multi-vane compressor) is one of the rotary displacement compressors.

The housing and rotary pistons moving inside form the chamber for inducting and compressing the medium.

A cylindrical rotor on eccentric bearings turns inside a closed housing. The rotor ( drum) has radial slots along its entire length. Inside the slots, slides move in a radial direction.

Fig. 3.11: Op. diagram of rotary vane compressor
When the rotor reaches a certain speed, the working slide is pressed outwards against the inner walls of the housing by centrifugal force. The compression chamber between the rotor and the housing is divided by slides into individual cells ( work chambers).

As a result of the eccentric arrangement of the rotor, the volume increases or decreases during a rotation.

The pressure chambers are lubricated by loss lubrication or oil injection.

By injecting larger quantities of oil into the compression chamber one achieves, in addition to lubrication, a cooling effect and a sealing of the slides against the inner wall of the housing. The injected oil can be separated from the compound of oil and air after compression and directed back to the oil circuit.

    • Very quiet running.
    • Pulse-free and even output of air.
    • Low space requirement and easy to service.
    • Low efficiency.
    • High maintenance costs due to wear on the slides.