Circulating water vacuum pump, also known as water ring vacuum pump is a rough vacuum pump. It can get the ultimate vacuum of 2000-4000 Pa, series atmosphere jet up to 270-670 Pa. Water ring pump can also be used as a compressor, called the water ring compressor, is a low pressure compressor, the pressure range of 1-2X105 Pa table pressure. Water ring vacuum pump was originally used as a self-priming pump, and then gradually used in many industrial sectors such as petroleum, chemical, machinery, mining, light industry, medicine and food. In many industrial processes, such as vacuum filtration, vacuum water diversion, vacuum feed, vacuum evaporation, vacuum concentration, vacuum resurgence and vacuum degassing, water ring pump is widely used. Due to the rapid development of vacuum application technology, water ring pumps have gained much attention in the area of ​​rough vacuum. As the water ring pump gas compression is isothermal, it can be extracted flammable and explosive gases, in addition to pumping dust, water-containing gas, therefore, water ring pump applications are increasing. The pump body contains an appropriate amount of water as a working fluid. When the impeller rotates clockwise in the figure, the water is thrown around by the impeller. Due to the centrifugal force, the water forms a closed ring of approximately equal thickness depending on the shape of the pump chamber. The inner surface of the lower part of the water ring is just tangential to the hub of the impeller, and the upper inner surface of the water ring is exactly opposite the top of the blade (in fact, the blade has a defined insertion depth within the water ring). At this moment, a crescent space is formed between the impeller hub and the water ring, and the space is divided into a plurality of small cavities equal to the number of the blades by the impeller. If the lower part of the impeller as a starting point, then the impeller 180 degrees before rotation, the small cavity area from small to large, and with the suction port on the end of the interface, when the gas is inhaled, when the inhalation of small cavity And the suction port isolated; when the impeller continues to rotate, the small cavity from large to small, so that the gas is compressed; when the small chamber communicates with the exhaust port, the gas will be discharged outside the pump. In summary, the water ring pump is based on changes in the volume of the pump to achieve suction, compression and exhaust, so it belongs to the varactor vacuum pump.
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