Centrifugal pumps work by utilizing the rotation of impellers to cause centrifugal motion in water. Before starting the water pump, it is necessary to fill the pump casing and suction pipe with water, and then start the motor to drive the impeller and water to rotate at high speed. The water undergoes centrifugal motion and is thrown towards the outer edge of the impeller, flowing into the pressure water pipeline of the water pump through the flow channel of the snail shaped pump casing.