How the Robuschi Screw Blower Airend Works?
The Robuschi oil-free screw blower airend is a positive displacement machine with rotary motion, also known as “helical screw” compressor. It delivers constant flow (volume) and variable pressure, which means that at a given speed (rpm), the compressor airend always supply the same amount of air, independently by the pressure variation. The screw blower airend consists of a pair of helical profile rotors (one male rotor with 3 convex lobes and one female rotor with 5 concave lobes or “flutes”), contained in a casing. The rotors turn in opposite direction maintaining precise alignment by means of timing; meshing they form a series of working chambers between the rotors and the casing wall. The gas is sucked from the intake side (suction), trapped between the rotors and the casing (radially) and the cover (axially), transported to the compression side (discharge) where the working chamber shrinks, and compressed. The internal compression leads to supply a steady, non-pulsating air flow, minimizing vibration and maintenance and maximizing lifetime. Due to the fact that there is no oil for sealing (oil-free screw), the rotors have very precise and small tolerances to maintain a very small air-gap between the two in order to guarantee optimal performance without touching each other.
