screw pump

A screw pump is a device that uses screw-shaped impellers to create working pressure for moving fluids. One notable example is the Archimedes screw, historically used for raising water and now employed in modern screw pumps for tasks like sewage pumping in wastewater treatment plants.12

Screw pumps are a type of positive displacement pump. In these pumps, a helical screw rotor turns within a specially shaped casing. As the screw rotates, cavities are formed that move fluid from the intake to the discharge end. This process draws fluid into the pump due to a partial vacuum and then increases pressure to force the fluid out. These pumps are effective for handling viscous liquids, as well as those containing vapors or solid particles, and they deliver a steady output.3