The multi-stage pump is the water inlet and outlet section and the middle section, which are combined together by the tie rod. Its output water pressure can be very large, it is a kind of centrifugal pump, and it also relies on the rotation of the impeller to obtain centrifugal force.
When the multi-stage centrifugal pump motor drives the impeller on the shaft to rotate at a high speed, the liquid filled in the impeller is thrown from the center of the impeller along the flow channel between the blades to the surrounding of the impeller under the action of centrifugal force. The pressure and speed are increased at the same time, and they are led to the impeller of the second stage through the flow channel of the guide casing, so that all the impellers and the guide casing flow through successively, and the pressure energy of the liquid is further increased. After stacking each impeller step by step, a certain head is obtained.
Multistage centrifugal pumps do not have self-priming ability and must be primed before starting. The working principle of various multi-stage centrifugal pumps is that the impeller drives the liquid to rotate at a high speed, so that the liquid generates centrifugal force to obtain energy. In this way, the liquid in the suction chamber on the front side of the first-stage impeller enters the first-stage impeller.
After the impeller does work on it, it is thrown into the first-stage guide wheel. After the first-stage guide wheel turns energy, it enters the second-stage impeller, and the second-stage impeller continues to do work on it, and then enters the second-stage guide wheel. And so on, until it is thrown out from the end impeller, collected by the volute, and sent to the discharge port for discharge.