When a water ring vacuum pump is in operation, is the cavitation protection tube always drawing in air?
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When a water ring vacuum pump is in operation, is the cavitation protection tube always drawing in air? If the inlet pressure is -0.097 Mpa, then the volume in the latter half of the cycle decreases and the pressure rises, but won’t it increase by much? Is it still a high vacuum? Air enters the exhaust port from the cavitation protection tube; could that air be drawn back into the intake port through the gap between the disk and the impeller? Is the exhaust port still at a very high vacuum level?
No, the gap between the impellers is sealed by the water ring, so there is no air flow between them
Is the exhaust port also under negative pressure during normal operation? It doesn’t make sense; if I understand it this way, the exhaust port is also drawing in air. . .
The compression chamber of the vane pump is connected to the outlet; the compressed gas is definitely under positive pressure
If the cavitation protection tube is connected to the compression chamber, doesn’t that make sense? Outside air cannot get in
This definitely means negative pressure at the inlet and positive pressure at the outlet
Don’t worry about whether it’s positive or negative pressure; as long as the outlet is higher than the inlet, that’s fine
The cavitation protection tube is normally closed and is used only when cavitation occurs in the unit. There are several other methods to address cavitation in the unit; the outlet pressure must be higher than the inlet pressure
Is the gas entering the pump at normal pressure when cavitation occurs? Or?
The level of pressure can be seen by looking at the gauge; cavitation in liquid ring vacuum pumps is caused by the vaporization of liquid carried in by the working fluid or gas phase, under the combined effect of high temperature and low pressure
No, with a positive-displacement design, the output volume is definitely higher than that of imported versions, and it won’t fail to draw in air. Even if the sealing plate does not provide a good water seal, it simply results in reduced efficiency due to more backflow