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Install anti-cavitation pipe and check valve
Liquid ring vacuum pump occurs cavitation, the main bubble in the rupture of the impeller and distributor (or distribution board) surface impact damage. In response to this feature, atmospheric pressure can be introduced into the compression transition zone. The specific method is: in the distributor (Yt plate) compression transition area to drill a small hole, and then the pipeline into the atmosphere to the atmosphere, the other end of the pipeline to install a check valve. The role of one-way valve is: to prevent the pump working fluid or gas out of the pump. This pipe is called anti-cavitation pipe. When the bubble ruptures during compression, introducing a higher pressure gas from the outside can promptly replenish the "space" caused by the rupture of the bubble. This can reduce cavitation damage to the pump and reduce noise and vibration caused by cavitation. Anti-cavitation valve installation position is shown in Figure 2-94. With the installation of atmospheric ejector If the liquid ring vacuum pump to form the higher the vacuum, the user's production more favorable for these conditions, the best way is to install a liquid ring vacuum pump based on the air ejector. The liquid ring vacuum pump only provides the driving gas source for the ejector. At this moment, the gas in the pumping system is pumped away by the viscous effect of the high-speed air stream generated by the magnetic pump in the ejector to make the pumping system form a higher vacuum. Coupled with the atmosphere after the ejector, liquid ring vacuum pump usually 100mbar absolute pressure near the work point. In the vacuum pump to provide power under the premise of the ejector can be 60 ~ 13mbar (absolute pressure) work. The difference between the absolute pressure at the actual operating point of the liquid ring vacuum pump and the saturated vapor pressure of the working fluid in the pump chamber is increased to achieve the desired anti-cavitation effect. If you require a higher vacuum, plus a different series of Roots vacuum pumps in series. Using a lower saturated vapor pressure of the liquid as a working fluid at the same temperature, different working fluids have different saturated vapor pressures. Cavitation may occur with water as a working fluid at a certain temperature and vacuum, and cavitation may not occur with other lower saturated vapor liquids as a working fluid. Select the working fluid, its density, viscosity, etc. is best with water close. The use of strong anti-cavitation material When the working fluid and the exhaust gas is corrosive, if the vacuum pump operating in the cavitation area, the practice proved that the use of cast iron made of impeller, its operating life is much lower than the selection of anti-cavitation ability Strong stainless steel (such as 304,316 material, etc.) manufactured impeller. When the vacuum pump used in both corrosion and cavitation occurred occasions, if the choice of inappropriate materials, cavitation and corrosion together, will greatly shorten the life of the vacuum pump. Improve the accuracy of selection If the selected liquid ring vacuum pump at the corresponding operating point of the suction capacity is greater than the amount of gas generated by the system, the actual operating point of the vacuum pump will be higher vacuum offset even close to "suffocated" state Running, the vacuum pump will have severe cavitation, the noise is very large, and accompanied by obvious vibration. Even if the intersection of user's required working point and water temperature correction curve falls in safe area, but when the intersection point and boundary curve are close, if the vacuum pumping margin of the selected vacuum pump is large, when the vacuum pump is put into operation, the absolute pressure of actual operation And the intersection of water temperature correction curve may shift to the cavitation area, so the accurate selection of liquid ring vacuum pump products, but also to prevent cavitation damage one of the necessary conditions.