A screw pump is a positive-displacement pump that use one or several screws to move fluids or solids along the screws axis. Screw pump has a structure same like a screw. screw pumps are self-priming double ended positive displacement pumps that are offered with or without external timing gears and bearings.
screw pump working principle:
The fluid delivered by a screw gear pump does not rotate, but moves linearly. The rotors work like endless pistons, which continuously move forward. There are no pulsations even at higher speed. Flow through a screw pump is axial and in the direction of the power rotor. The inlet hydraulic fluid that surrounds the rotors is trapped as the rotors rotate. This fluid is pushed uniformly with the rotation of the rotors along the axis and is forced out the other end.
A screw pump is an axial-flow gear pump, similar in operation to a rotary screw compressor. Three types of screw pumps are the single-screw, two-screw, and three-screw. Define screw pump: a pump in which the working pressure is created by means of screw-shaped impellers in the vertical water column.