Rotary vane vacuum pump is a kind of rough vacuum pump, it can get the ultimate vacuum for 2000 ~ 4000 pa, equiped with air ejector can reach 270 ~ 270.Rotary vane vacuum pump can be used as a compressor, also called the rotary vane compressor, belongs to low pressure compressor, the pressure range of 1 ~ 2 x 105 pa gauge pressure.
Originally the rotary vane vacuum pump used as self-priming pump, and then gradually used in petroleum, chemical industry, machinery, mining, light industry, medicine and food and many other industries.In many industrial production process, such as vacuum filter, vacuum water diversion, vacuum feed, vacuum evaporation, vacuum concentration, vacuum resurgence and vacuum degassing, rotary vane pump is widely used.
In the pump body is equipped with the right amount of water as working fluid.When the impeller rotate clockwise according to the diagram, impeller water to be thrown around, due to the effect of centrifugal force, the water formed a decision in the pump cavity shape similar to the thickness of the closed circle, etc.The surface of the lower part of the rotary blade is right wheel tangent with the impeller, rotary vane on the division of surface contact with the top of the blade.As the impeller wheel with rotary blade formed between a crescent-shaped space, this space is divided into impeller and blade is equal to the number of a number of small cavity.If the bottom of the impeller 0 ° as starting point, so in front of the rotating impeller 180 ° when small cavity volume changes from small to big, and with suction mouth on the face, the gas is inhaled, when the suction at the end of the small cavity is isolated from the rest of inspiratory mouth;When the impeller to rotate, small cavity from large to small, make the gas is compressed;When small cavity with vent gas was discharge pump.
The rotary vane vacuum pump include single satge rotary vane vacuum pump and double stage rotary vane vacuum pump,Means that there is a bipolar structure will be two single pump together, make it a bipolar, more commonly in order to obtain higher vacuum degree.rotary vane vacuum pump and rotary piston vacuum pumpalway be the backing pump.
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