The Mechanical booster is a rotary positive displacement unit using two specially profiled, contra- rotating, and balance impellers.
One impeller is motor drive a pair of running gear in the pump casing transfer drive to the other impeller.
The impellers do not touch each other, or the casing, but are separated by clearances of typically a few tenths of m.m.
Gas drawn in at the suction connection. Trapped between each impeller and the casing, then transported to the discharge and ejected. The Rotor form is such that back flow of gas between the impellers is negligible.
Each end casing of the pump contains oil for lubrication of the gears and bearings. The oil is prevented from entering the pumping chamber by seals in the head plates. The pump end casings operator under vacuum. The Air being evacuated into pumping chamber through the head plate seals. The pumping chamber is completely dry and the machine relies on a high operating speed, typically 1400 RPM or 1450 RPM, to give high displacement whilst the small clearances limit back flow.
