Roots High Vacuum Booster Blowers
ROOTS® RGS High Vacuum Boosters are continuous duty units designed for applications to the single digit micron range when used in series with a backing pump.
The basic high vacuum booster is constructed with a close-grained grey iron cylinder, alloy steel timing gears, ductile iron impellers and antifriction bearings.
RGS High Vacuum Boosters have four pressure lubricated singleface seals, one at each shaft, between the bearing and pumping compartment. Gears and bearings are under atmospheric pressure. A shaft driven oil pump supplies clean, cool lubricating oil to gears, bearings and seals.
Bi-Lobe Operating Principle
Two figure-eight lobe impellers mounted on parallel shafts rotate in opposite directions. As each impeller passes the blower inlet, it traps a finite volume of air and carries it around the case to the blower outlet, where the air is discharged. With constant speed operation, the displaced volume is essentially the same regardless of pressure, temperature or barometric pressure. Timing gears control the relative position of the impellers to each other and maintain small but finite clearances. This allows operation without lubrication being required inside the lobe cavity.
