One type of vacuum pump is the rotary vane pump. They are a part of positive displacement pump category. They move the fluid through the pump using the rotating assembly in the pumping chamber. It usually takes one or two rotating vanes to move the gas or the fluid from the inlet to the outlet. As the bulk of the fluid is transferred by the rotary vane pumps the end of the vane barely brushes the housing part and thus creates the seal from the inlet to the outlet.
The segment of rotary vane pumps are included in these vacuum pumps. A rotary vane pump is a positive-displacement pump consisting of vanes attached to a rotor that rotates inside the cavity. This causes a vacuum in the center of the pump creating a suction and a void. To fill this void water or other fluid enters into the pump via an inlet valve. Once the fluid is inside the pump, the intake valve shuts and subsequently the outlet valve opens up. These series of events allow the fluid to flow back outside through another path.
Rotary vane vacuum pumps are of two different types. The non-lubricated pump, also referred to as an 'oil-free' pump while other type is lubricated pump. Both the types of rotary vane vacuum pumps operate on the same theory but used for different applications.
Rotary vane pumps are one of the most widely used vacuum pumps in manufacturing industry. Their most common use in daily life is removal of water from the basement of buildings. The rationale for using a vacuum pump is, water needs to be moved upwards and this is possible only by creating enough vacuum that will eventually draw the water inside the pump and then push it uphill into the outer area.
Since countless years now, these pumps have been providing revolutionary changes across industries and enriching millions of lives.