Operating Principle of Atmospheric Air Ejector-Liquid ring pump combination systems
As shown in the diagram, discharge port of the ejector is connected to the suction port of the LRVP. When the LRVP is started it develops a certain vacuum at its suction port depending upon the flow passing through it. The same vacuum is also transferred to the discharge flange of the ejector and also inside the entire ejector.
The motive nozzle of the ejector is open to atmosphere at its inlet side. Due to pressure difference across the motive nozzle (atmospheric pressure at inlet and vacuum developed by the LRVP at outlet) air from the atmosphere starts flowing through motive nozzle into the ejector.
As the air flows through the nozzle it expands and its velocity increases. This air then entrains the medium at the suction port of the ejector and provides kinetic energy which is converted to pressure as the mixed flow undergoes compression as it flows through the ejector
The flow of atmospheric air has to be regulated for the stable performance of the system. Too much of atmospheric air will choke the system while too less will result in loss of vacuum.
The compression in the ejector enables the pressure at suction flange of the ejector to be lower than the vacuum pump.
The mixture is then inducted into the pump at the discharge pressure of the ejector which is compressed by the vacuum pump upto atmospheric pressure.
Our expertise in ejectors helps us to design the geometry so as to allow the precise amount of atmospheric air through it. Any variation in the amount of atmospheric air compared to the design value will affect the performance band of both the pump and ejector destabilizing the entire system.
Ejector design plays a pivotal role in these systems as the ejector has to be designed in order to match the vacuum pump characteristics. To facilitate the right amount of compression the system has to be designed carefully and manufactured with strict tolerances.