Screw Pumps

A screw pump is also known as a water screw. It uses the rotation of spiral blades to raise water in an axial spiral. A screw pump consists of motors, bearing seats, screw shafts, check valves, mixing chambers and nozzles. When pumping, place the pump diagonally in the water so that the inclination angle of the main shaft of the pump can be smaller than that of the spiral blade, and the lower end of the spiral blade can be in contact with water. When the prime mover drives the spiral pump shaft to rotate through the speed change device, the water enters the blade and rises along the spiral flow path until the outflow. A screw pump has advantages of simple structure, great flows, small head loss, high efficiency, being easy to manufacture, repair and maintenance, but it has disadvantages of low head, low speed and setting up gear changing devices. It is widely used in irrigation, drainage, lifting of sewage and sludge and other occasions.