When the centrifugal pump to start, shaft Roll forming machine drive for high-speed rotating impeller together movement to force the filling in advance in the liquid between the rotating blades, in the role of the centrifugalforming machine force of inertia, the liquid from the center outward impeller radial campaign for weeks. Impeller in the liquid flow through the course of the campaign was the energy, static pressure can be increased, the flow rate increases. When leaving the liquid into the impeller pump shell after shell due to flow gradually to wow powerlevel expand and slow down some of the kinetic energy into static pressure to the final cut along the discharge into the pipeline. So snail-shaped shell is not only a pool pump impeller by the outflow of liquid components, and also be able to turn a device. When the liquid from the impeller center field off the week at the same time, forming of Impeller center area of low pressure in the tank with liquid centers impeller of the total potential role of the poor, resulting in liquidyiwu market being sucked into the impeller center. Rely on the continued operation of the impeller, the liquid in a row would be inhalation and discharged. In the centrifugal liquid obtained mechanical energy for WOW Power Leveling the final performance of the static pressure can be improved.