A centrifugal pump works Centrifugal pump works 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 the pump is started, the pump housing is filled with the liquid to be transported. After starting, the impeller is driven by the shaft to rotate at a high speed and the liquid between the blades must also rotate with it. 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. 2 gas binding phenomenon When there is air in the pump housing, due to the density of the air density is much smaller than the liquid generated less centrifugal force. Thus, the tank above the liquid level and the pump inlet pressure difference is not enough to liquid storage tank pressure into the pump, that is, centrifugal pump without self-suction capacity, so that the centrifugal pump can not deliver liquid, a phenomenon called "gas tied phenomenon". In order to fill the pump with liquid, a bottom valve with strainer is usually installed at the bottom of the suction pipe. The bottom valve is a check valve. The filter serves to prevent the solid matter from entering the pump and damaging the impeller or impeding the normal operation of the pump. Second, the main components of the centrifugal pump The main components are impeller, pump housing and shaft seal device. 1 Impeller The role of the impeller is the mechanical energy of the prime mover directly to the liquid to increase the hydrostatic pressure and kinetic energy (mainly to increase static pressure). Impellers generally have 6 to 12 blades after bending.
