The Pros Of Rotary Screw Air Compressors

The principle of rotating compressed air is not much different from piston compression. Both are positive displacement engines that take a fixed volume of air at atmospheric pressure with each revolution and reduce this volume to increase the pressure to a value above atmospheric pressure.

Unlike reciprocating compressors, which use a cylindrical and reciprocating device in a linear compression process, screw compressors use a pair of intertwined screws (rotors) housed in the stator housing (air duct) with an inlet at one end and an outlet at the other. You can also buy screw air compressors via

Rotary Screw Air Compressor

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The male rotor has a "blade" cut in a spiral along the length of the rotor and the female rotor has a corresponding "flute" cut in a spiral pattern along its length. 

The male and female rotors are cut to very tight tolerances and are connected as they rotate. Since the ends of the male and female rotors meet at the inlet side of the air outlet, there is a space (volume) through which atmospheric air is drawn into the compression chamber.

As soon as the male and female rotors “meet” at the inlet, the intake air volume between the vanes/ducts and the stator housing is recorded. Due to the spiral pattern of the rotor blades/grooves, the space between the rotor and the stator housing gradually decreases as the mixing rotor opens to the outlet.

In the event of a leak, the volume of drawn atmospheric air decreases, which results in a higher pressure: volume and pressure are inversely related.