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In the conventional Single stage vacuum pump the performance after 70% (525 mmHg) vacuum falls down drastically. Whereas the two stage vacuum pumps gives better performance after 70% vacuum. Normally the vacuum pump requires to run consistently between 70 to 90% vacuum.
In first stage, after creating vacuum up to 70% , the compressed air /vapour mist with sealing media is led to the IInd stage working chamber via crossover manifold. IInd stage enhances the vacuum generated by Ist stage.
This way, two stage water ring vacuum pump gives nearly 50% more volumetric efficiency after 70% vacuum with the same Electric Motor rating. This results in saving of nearly 50% power. |