Screw pump, also known as "screw pump", "Archimedes screw pump". A pump that uses the rotation of the helical blade to make the water body spiral upward in the axial direction. It consists of a shaft, a spiral blade, and a casing. When pumping water, place the pump obliquely in the water so that the inclination angle of the main shaft of the water pump is smaller than the inclination angle of the helical blade, and the lower end of the helical blade is in contact with the water. When the prime mover drives the screw pump shaft to rotate through the speed change device, the water enters the blades and rises along the spiral flow path until it flows out. Simple structure, easy manufacture, large flow rate, small water head loss, high efficiency, easy repair and maintenance, but low head and low speed, need to install a speed change device. It is mostly used for irrigation, drainage, and lifting of sewage and sludge.
The device of the screw pump includes three parts: the prime mover, the variable speed transmission device and the screw pump, which is composed of the screw blade, the pump shaft, the bearing seat and the casing. The screw pump is installed obliquely between the upper and lower pools, and the lower blades of the screw pump are immersed below the water surface. When the pump shaft rotates, the helical blades push the water in the pool into the leaf groove, and the water is lifted up step by step along the helical shaft under the action of the rotating blades of the helix until it reaches the water outlet of the helical pump. The screw pump only changes the potential energy of the fluid, which is different from the vane water pump, which converts mechanical energy into the potential energy and kinetic energy of the transported liquid.
