Centrifugal pump is the impeller rotation, the mechanical energy can be passed to the liquid, so that the liquid to obtain kinetic energy, and through the spiral case to the kinetic energy into static pressure liquid conveying machinery. The work principle is the centrifugal action, the centrifugal pump characteristic is the work scope is big, the pressure head changes with the head.
Gear pump with double gear meshing, each time to a certain volume (liquid in the interdental volume) from one side of the bidentate toward the other side is characterized in that the work pressure high lift), but the delivery process and small, but traffic is not with the pressure head change.
Is similar to the screw pump a lot with the gear pump, the screw rotational engagement in the pump body of internal thread groove to transport the liquid pump, the screw rotates a week, liquid in a cavity seal to move forward a pitch, with the continuous rotation of the screw, spiral form of liquid from a sealed cavity pressure sealed cavity to another, and finally out of the pump body. According to the number of screw, there are single screw pump, double screw pump and multi screw pump. It is characterized by high pressure, flow of water. Can be used for the transport of liquid metal (such as lead liquid).
