24/10/2025
النوع الثاني من الطلمبات هو الطلمبة الريشية ( Vane Pump)
Vane pump consists of vanes (Blades) which slide in slots in a rotor. Rotor eccentrically rotates in a cam-ring. Vanes, rotor and cam-ring are covered from both sides by pressure plates. When rotor rotates by drive shaft, it throws out vanes (blades) due to centrifugal force against cam ring. Vanes rub against cam-ring under centrifugal force as rotor rotates.
But as rotor is eccentrically located in cam-ring, hence while rubbing against cam-ring blades also reciprocate in and out in slots in rotor. Because of this action the volume between two vanes increase and decrease in one rotation of rotor. When volume between vanes increase, the vacuum get created which suck oil between vanes. And when volume between vanes decreases it push out oil between vanes. This cause the pumping action of vane pump.
Vane pumps are economical and simple in maintenance and repair. They are made from harden alloy steel, hence they are comparatively less susceptible to heat and oil contamination as compare to other pump. Hence for most moderate pressure and heavy duty operation vane pumps are most suited.
