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The use of liquid ring pump and precautions
Liquid ring pump, in general, the working fluid used is water. The energy acting on the rotor impeller is received by the liquid and transferred to the compressed gas, thus causing the temperature of the water ring to rise. A portion of the water in the ring is compressed with the gas to exclude the pump. Most of the heat generated during the compression is taken away. Therefore need to constantly add fresh water, so that the water ring pump temperature is kept constant. In most water ring pumps, its operating temperature is about 15 ~ 20 ℃, it depends on the temperature of the water added. In fact, the ultimate pressure of the water ring pump is not very important, because different liquids, cavitation occurs when the pressure is lower than 50 ~ 60hPa, pump parts will be damaged. When the pump approaches the limit pressure, the pumping speed is very low and the water at the pump inlet starts to boil. As you go to the outlet of the pump, the bubbles that form begin to crack. This produces a significant amount of noise, while the components of the pump drive and pump chamber are gradually destroyed. This phenomenon is commonly referred to as cavitation. Once cavitation occurs, introduce a small amount of fresh air through the valve. In this case, a small hole is made in the inlet pipe to allow some fresh gas to be added in a quantitative manner. Cavitation does not occur if a gas jet is used. The single-stage water ring pump is only suitable for the inlet pressure of 130 ~ 1013kPa pressure range, the compression ratio of 1: 7. When the inlet pressure is lower than 130kPa, the recommended double-stage water ring pump. In the two-stage pump, two pump chambers are connected in series, the working chamber volume ratio is about 2.5: 1.