The centrifugal pump is usually driven by an electric motor. Before starting the pump, the pump body and suction line are filled with liquid. When the impeller is rotating at high speed, the impeller drives the liquid between the blades to rotate. Because of the centrifugal force, the liquid is flung from the center of the impeller to the outer edge of the impeller (the flow rate can be increased to 15 ~ 25m/s), and the kinetic energy is also increased. When the liquid enters the pump shell, the flow velocity of the liquid gradually decreases and a part of the kinetic energy is converted to the static pressure due to the gradual expansion of the flow channel in the volute pump shell, and the liquid flows out with a higher pressure along the outlet.
At the same time, a certain vacuum is formed because the liquid is thrown out at the center of the impeller, and the pressure Pa in the liquid surface is higher than the center of the impeller. Therefore, the liquid of the suction pipe enters the pump under the pressure difference. The impeller keeps spinning, and the liquid is continuously inhaled and pressed.
Because centrifugal pump can transport liquid, it is mainly centrifugal force, so it is called centrifugal pump.
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