Centrifugal pumps are the main flow components have suction chamber, impeller and pressurized water chamber. The water suction chamber is located in front of the water inlet of the impeller and functions as a guide for the liquid to the impeller. The water pressure chamber mainly has three forms of a spiral water pressure chamber (volute type), guide vanes and space guide vanes. The impeller is the most The important working element is the heart of the overcurrent part, which consists of the cover and the middle leaf. Centrifugal pump work before the pump filled with liquid, and then start the centrifugal pump, the impeller rotates quickly, impeller blades drive liquid rotation, the liquid rotates by inertia to the outer edge of the impeller flow, at the same time the impeller sucked liquid from the suction chamber, at the same time In this process, the liquid in the impeller flows around the flow vane, and the liquid acts a lift on the vane in the flow around the flow. In turn, the vane acts on the liquid with an equal and opposite force to the lift, So that the liquid energy out of the impeller, then the kinetic energy and pressure of liquid are increased. Centrifugal pumps depend on the action of the rotating impeller on the liquid to transfer the mechanical energy of the prime mover to the liquid. As the role of centrifugal pump fluid from the impeller inlet to the outlet of the process, its speed and pressure energy can be increased by the impeller discharge liquid through the pressure chamber, most of the speed can be converted into pressure energy, and then along the discharge line Out, at this time, the impeller inlet due to the discharge of liquid to form a vacuum or low pressure, the liquid in the suction tank under the surface pressure (atmospheric pressure) is pressed into the impeller inlet, so the rotating impeller continuous Inhale and discharge liquid.