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Vacuum Pumps & Compressors

Air Ejector Working Principle

Air ejector which uses air of atmosphere pressure as the motive fluid.

It's simple structure comprised a suction chamber, diffuser and nozzle.

After a pump reduces vacuum chamber pressure to between 70 ~ 50 Torr, the motive valve in front of the nozzle of the air ejector is opened.

Where upon outside atmosphere enters the diffuser through the nozzle at a supersonic rate.

This jet flow, coupled with the diffuser's action, reduces pressure at the intake port of the air ejector to below that of a liquid ring vacuum pump alone.

Ultimate pressure under no load is 12 Torr with single stage of liquid ring vacuum pump, 6 Torr with double stage of liquid ring vacuum pump.

cps 32-20



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