A screw pump, also known as a screw-type water pump, helical pump, or helical water conveyor, is a positive displacement rotary pump. Its working principle utilizes the moving contact surface (sealing surface) formed between the rotating screw rotor and the pump body's internal surface to continuously, uniformly, and pulsately expel liquid from the helical space of the screw pair along the axial direction, thereby achieving media transportation. Alternatively, it works by changing the volume of the space created by the meshing of the screws.
Based on the number of screws, they are mainly classified into single-screw pumps, twin-screw pumps, and three-screw pumps. A single-screw pump is an internally meshing eccentric rotary positive displacement pump, consisting of a single-headed helical rotor and a stator with a double-ended helix. Twin-screw and three-screw pumps rely on the meshing of multiple screws for operation.
This pump features high flow rate, high pressure, stable operation (pulsation-free), low vibration, low noise, reliable operation, and long service life. It can transport lubricating or non-lubricating, high-viscosity or low-viscosity liquids, gases, and media containing a small amount of solid particles, exhibiting excellent media adaptability. Compared with centrifugal pumps, gear pumps, and piston pumps, screw pumps have significant advantages when handling media with high viscosity, containing solid particles, or requiring stable pressure.
