If the liquid ring vacuum pump works for a long time in the state of cavitation, the noise and vibration of the pump will become larger, and even cause damage to the pump. Therefore, it is necessary to avoid the liquid ring vacuum pump working in the state of cavitation. The following methods can be used:
1. Reduce the temperature of the working fluid
On the premise that the working point of the liquid ring vacuum pump is a fixed value, reducing the temperature of the working fluid can achieve the effect of preventing cavitation.
2. Make the vacuum pump run in a safe area and improve the accuracy of model selection
This requires that in the selection stage, when selecting the suction pressure of the liquid ring vacuum pump and the temperature of the working fluid, try to avoid the pressure range where the liquid ring pump is prone to cavitation.
3. Install cavitation protection pipeline or check valve
When the bubbles generated in the cavitation process are ruptured during the compression process, the introduction of non-condensable gas with higher pressure from the outside can timely supplement the space caused by the bubble rupture, which can greatly reduce the damage to the pump caused by cavitation and reduce the damage caused by cavitation. noise and vibration. 2BV, 2BE1 are equipped with cavitation protection interface. When cavitation occurs in the pump, filling the non-condensable gas from the cavitation protection interface on the suction side of the pump can eliminate the cavitation noise and greatly reduce the damage to the pump caused by cavitation.
4. Equipped with air ejector
If the suction port of the liquid ring vacuum pump is equipped with an atmospheric ejector, the liquid ring pump is not prone to cavitation.
5. Use liquid with lower saturated vapor pressure as work.
6. The impeller and disc of the pump are made of materials with strong anti-cavitation ability