Screw Pump :
Three screw pump consist of central drive
rotor with two meshing idler rotors ,the rotor turns inside a housing machined to close tolerance.
Sliding Vane Pump:
Ø Sliding
pump consist a rotor having a number of axial slots and fixed eccentrically in
a casing.
Ø The
rotor carries vanes in its slots which maintain contact with casing through the
effect of centrifugal force.
Ø Fluid
enters through inlet port as the gap between the rotor and casing is increasing
and trapped fluid deliver to outlet port.
Lobe Pump:
Ø Two inter meshed rotors are each affixed to gear driven shaft.
Ø The
shafts rotate in opposite directions.
Ø The
rotating motion of the rotors create an expanding cavity on the suction
side.
Ø This
allows fluid to enter and fill the suction side of the pump.
Ø The
rotors carry the fluid around the housing to the discharge side where it is
expelled out of the pump by the closing cavity.
