Large river water pump suction type centrifugal pump (non centrifugal pump): the pump shaft is higher than the pool surface. Before the start and need to first water was poured full shell and the water pump pipeline, then drive motor, so that the motion of the high-speed rotation of the impeller, water under the action of the centrifugal force is thrown out of the impeller, negative pressure is formed in the center of the impeller, suction sump water under the action of atmospheric pressure into the impeller, and by high speed rotating blade wheel load, is thrown out of the impeller into the pressure water pipeline.