The basic working principle of centrifugal pump impeller installed in the pump housing 2, and fastened to the pump shaft 3, the pump shaft directly driven by the motor. The pump housing has a liquid suction 4 and suction pipe 5 connected. The liquid enters the pump through the bottom valve 6 and the suction tube. The liquid discharge port 8 in the pump housing is connected to the discharge pipe 9. Before starting the centrifugal pump, the pump housing filled with liquid being transported; start, start, the impeller driven by the shaft at high speed rotation, the fluid between the blades must also be with the rotation. Under the action of centrifugal force, liquid is thrown from the center of the impeller to the outer edge and gains energy, leaving the outer edge of the impeller to enter the scroll casing at a high speed. In the volute, the liquid due to the gradual expansion of the slowing down, but also part of the kinetic energy into static pressure, and finally to a higher pressure into the discharge pipe, to the required place. When the liquid flows from the impeller center to the outer edge, a certain vacuum is formed in the center of the impeller. Since the pressure above the liquid level in the sump is greater than the pressure at the inlet of the pump, the liquid is continuously pressed into the impeller. Visible, as long as the impeller constantly rotating, the liquid will be continuously inhaled and discharged.
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