Rotary Vane Vacuum Pumps and Systems

Rotary vane vacuum pumps move fluid through the pump using a rotating assembly in the pumping chamber.  Typically there are two or more rotating vanes that move the gas or fluid from inlet to outlet.  Rotary vane vacuum pumps are positive displacement pumps.  The volume of fluid that is transferred by rotary vane pumps depends upon the size of the housing and the area between each adjacent vane.  Larger pumps may have additional impeller vanes.  As the rotor turns, the ends of the vane barely touch the housing creating a seal from inlet to outlet.  The inlet and outlet are often perpendicular, however for vacuum service applications two inlets may be used, one for air supply and the other for the pumped media.  The fluid is pressurized as the volume between the vanes lessens during one half-cycle and is suctioned through an intake port during the other half-cycle.

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