The water-ring vacuum pump is a kind of coarse vacuum pump, which is called water-ring pump for short. The limit vacuum it can obtain is 2000-4000Pa. Assuming the series of atmospheric radiators, it can reach 270-670Pa. Water ring vacuum pump is widely used in industrial production, such as vacuum filtration, vacuum water diversion, vacuum feeding, vacuum evaporation, vacuum dilution, vacuum moisture regain and vacuum degassing. Because the gas in the water ring pump is isothermal, so often can also extract flammable, explosive gas, in addition can also extract dust, water-bearing gas, in the pump body of the ordinary demand for excessive water as working fluid.
Rotary vane vacuum pump is an oil-sealed mechanical vacuum pump, referred to as rotary vane pump, its operating pressure scale is 101325 ~ 1.33 *10-2 (Pa), due to low vacuum pump. Rotary vane vacuum pump can be used independently or as the front-stage pump of other high vacuum pumps or ultra-high vacuum pumps, mainly used in metallurgy, machinery, electronics, chemical industry, light industry, petroleum and other production and scientific research departments. Rotary vane vacuum pump can remove the monotonous gas in the sealed container, assuming that there is a gas ballast equipment, but also can be used to extract a certain amount of condensable gas. However, it should be noted that the rotary vane vacuum pump can not be used to remove oxygen-rich, corrosive to metals, pump oil will react chemically and contain particles of dust gas. Rotary vane pumps are mostly small and medium sized pumps. Rotary pump is divided into single and double stages.
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