Multiple ejector pump assembly - has series of nozzles with inserted rod to create annular gaps

摘要

The ejector arrangement has a set of nozzles (22,23,24,25) positioned one behind the other. There is an inlet channel for a gaseous medium under pressure, a suction chamber and a number of suction channels connected by one-way valves with the suction chamber. The flow cross section of the nozzles is ring-shaped and the gaseous medium flows only through the annular gap between the walls of the nozzles and a concentric, axially arranged rod (27). USE/ADVANTAGE - Ejector having improved suction performance and providing a good vacuum.