1. Reduce the temperature of the working fluid Liquid ring vacuum pump in operation, the discharge of gas will bring a certain amount of working fluid, must continue to provide working fluid to the pump chamber to ensure its normal work. The lower the working fluid temperature supplied to the chamber, the lower its saturated vapor pressure "Pneumatic Diaphragm Pump" Table 2-25 Saturated vapor pressure of water at different temperatures / ° C 15 20 25 30 35 40 Saturated vapor pressure mhar 17.04 23.37 31.66 42.41 56.22 73.75 Assuming the operating point of the vacuum pump is at 80 mbar (absolute pressure), the higher the water temperature, the smaller the difference between the absolute pressure at the operating point and the saturated vapor pressure of the water and the more likely the pump to cavitate. Therefore, the working point of the liquid ring vacuum pump is fixed under the premise of reducing the working fluid temperature can achieve the anti-cavitation effect. 2. Reduce the inhalation gas temperature If the inhalation gas temperature is too high, the gas in contact with the pump liquid, heat of compression and heat of the gas itself will be transmitted to the liquid, so that the liquid ring temperature is increased, that is, the pump cavity liquid saturation Vapor pressure increased. Conversely, lowering the temperature of the suction gas reduces the liquid ring temperature, thereby reducing the saturated vapor pressure of the liquid in the pump chamber. 3. The liquid ring vacuum pump is operating in a safe area In the selection of liquid ring vacuum pump, we should take into account the relationship between the working point and the working fluid temperature, the vacuum pump in the cavitation safety zone to run. When using water as the working fluid, Figure 2-93 is the water temperature on the liquid ring vacuum pump exhaust volume curve. Two zones separated by a boundary line, the cavitation zone on the left and the operational safety zone on the right. Vacuum pump operating point (absolute pressure, mbar) for the abscissa, the vertical axis of the water pump vacuum pumping performance coefficient. When the working point and the water temperature correction curve intersection points fall in the cavitation zone, the vacuum pump will produce cavitation. For example, when the working point is at 50 mbar, the water coefficient curve intersects with the water coefficient curve at 18 ° C in the safe zone and the water coefficient curve at 26 ° C intersects the cavitation zone. The intersection of the two above shows that it is safe to operate the vacuum pump at 50 mbar at a water temperature of 18 ° C. If the water temperature is 26 ℃, the vacuum pump will have cavitation damage.
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