The difference between centrifugal pump and self-priming pump is:
1, composition is not the same: the basic structure of the centrifugal pump is composed of six parts are respectively impeller, pump body, pump shaft, bearing, sealing ring, packing box. The self-priming pump consists of suction chamber, liquid storage chamber, vortex chamber, liquid return hole, gas-liquid separation chamber and so on.
2, the advantages are not the same: self-priming pump has the advantages of compact structure, convenient operation, stable operation, easy maintenance, high efficiency, long life, and strong self-priming capacity. Centrifugal pump advantages are compact structure, wide range of flow and head range wide, suitable for mildly corrosive liquid, a variety of control options, uniform flow, smooth operation, small vibration, do not need special shock absorption of the foundation, equipment installation, maintenance and repair costs are low.
3, the working principle is not the same: the working principle of the self-priming pump is that the pump starts before filling the pump shell with water (or the pump shell itself with water). After starting, the impeller rotates at high speed to make the water flow in the impeller groove to the vortex shell, then the inlet forms a vacuum, the inlet check door is opened, the air in the suction pipe enters the pump, and reaches the outer edge through the impeller groove.
Centrifugal pump is the use of impeller rotation and make water centrifugal movement to work. Before starting the pump, the pump shell and the suction pipe must be filled with water, and then start the motor, so that the pump shaft drives the impeller and the water to do high-speed rotating movement, water centrifugal movement, is thrown to the impeller outer edge, through the cochlear pump shell of the flow into the water pump pressure pipe road.