TYPES OF ROTARY PUMPS ( VANE PUMP)

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 TYPES OF ROTARY PUMPS ( VANE PUMP) 

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• A vane pump too traps the liquid by forming a compartment comprising of vanes and the casing . As the rotor turns, the trapped liquid is traversed from the suction port to the discharge port. 

• A slotted rotor or impeller is eccentrically supported in a cycloidal cam. The rotor is located close to the wall of the cam so a crescent-shaped cavity is formed. The rotor is sealed in the cam by two side plates. Vanes or blades fit within the slots of the impeller. 

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• As the impeller rotates and fluid enters the pump, centrifugal force, hydraulic pressure, and/or pushrods push the vanes to the walls of the housing. 

• The tight seal among the vanes, rotor, cam, and side plate is the key to the good suction characteristics common to the Vane pumping principle. 

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• The housing and cam force fluid into the pumping chamber through the holes in the cam. Fluid enters the pockets created by the vanes, rotor, cam, and side plate. 

• As the impeller continues around, the vanes sweep the fluid to the opposite side of the crescent where it is squeezed through the discharge holes of the cam as the vane approaches the point of the crescent. Fluid then exits the discharge port. 

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• Vane pumps are ideally suited for low-viscosity, non lubricating liquids.