Booster-Air Ejector-Liquid Ring Vacuum Systems incorporate a venturi ejector at the liquid ring vacuum pump inlet, through which sealant liquid is forced, reducing the pressure on the ejector inlet. A mechanical vacuum booster supercharges the ejector, affording deeper vacuum than can be achieved with either mechanical boosting or air ejection alone. Flow ranges extend to approximately 2000 CFM (3400 m³/h) with vacuum levels of 0.1 Torr (0.13 mbar).
Principle of Operation
In this system, an air ejector is inserted between the mechanical lobe-type booster and the liquid ring pump. This enhances pump performance across a wide range of sealant properties, and lowers the booster discharge pressure. The result is significantly lower continuous operating vacuum levels without increasing horsepower requirements. Ambient air or recirculated process gas is used as motive gas in the air ejector. To allow high-capacity pumping at 30 Torr or above, motive air shut-off valves and a bypass manifold may be added to the system. Air ejectors are also used without boosters for certain applications where system simplicity is beneficial.
Booster-Air Ejector-Liquid Ring Vacuum Systems
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