A vane pump is generally a rotary pump.
How it worksEdit
It is a positive displacement pump that consists of vanes in a rotor rotating inside of a cavity. The centers of these two circles are offset, causing eccentricity. Vanes are allowed to slide into and out of the rotor and seal on all edges, creating vane chambers that do the pumping work. On the intake side of the pump, the vane chambers are increasing in volume. These increasing volume vane chambers are filled with fluid forced in by the inlet pressure. Often this inlet pressure is nothing more than pressure from the atmosphere. On the discharge side of the pump, the vane chambers are decreasing in volume, forcing fluid out of the pump.
The most simple vane pump is a circular rotor rotating inside of a larger circular cavity.
The action of the vane gradually drives out a volume of fluid with each rotation, slowly reaching the required pressure -- about 10-2 Torr.
They are also used in 1990 subaru legacy's power steering.
Pumps for mid-range pressures include applications such as carbonators for fountain soft drink dispensers and espresso coffee machines.
They are also often used as vacuum pumps for low-vacuum applications including evacuating refrigerant lines in air conditioners, and laboratory freeze dryers.
They are also used with modification in thermal stations for maintaining vacuum in condensers.
They are also often used in physics experiments in laboratories.
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