The rotary screw belongs to the positive displacement compressor family. Positive displacement pumps create flow by applying an expanding cavity on the suction side and a decreasing cavity on the discharge side.
A gas that is trapped inside the positive displacement machine is a predetermined volume that's then compressed or displaced to the discharge manifold. If you're searching for screw compressor then you can click this link https://www.americanhermetics.net/content/compressors/bitzer
The two most commonly used compressors today are the rotary screw (helical rotor) and the reciprocating piston.
Compared to the two, the rotary screw doesn't utilize valves, is lighter in weight compared to the reciprocating piston, is pulsation free making base requirements less extreme and maintains its layout efficiency over usable time as the rotors never come in contact with one another.
The screw compressor was originally designed from the mid-1950s and finally developed to operate between the reciprocating piston and centrifugal machine capacities for commercial, gas and industrial type applications.
The Rotary screw compressor consists of two intermeshing helical rotors contained in a housing. The man or push rotor is connected via a rotating extension by an electric motor or engine. A dry rotary screw compressor employs a set of timing gears to attain appropriate rotation.
The diameter and length of these rotors modulate the last pressure and capacity the machine can produce.
As the rotor diameter increases, so does the air pump capacity; As the length of the rotor increases, so does the pumps closing pressure.