Aluminum gravity casting bracket

Aluminum gravity casting bracket.Before the pump starts, the pump shell is filled with the liquid being transported;After starting, the impeller is driven by the shaft to rotate at high speed, and the liquid between the blades must also rotate.Under the action of centrifugal force, the liquid is thrown from the center of the impeller to the outer edge and the energy is obtained.In the volute, the liquid slows down due to the gradual expansion of the flow channel, which converts part of the kinetic energy into static pressure energy, and finally flows into the discharge pipe at a higher pressure and sends it to the place where it is needed.When the liquid flows from the center of the impeller to the outer edge, a certain vacuum is formed in the center of the impeller. As the pressure above the reservoir level is greater than the pressure at the pump inlet, the liquid is continuously pressed into the impeller.Visible, as long as the impeller continues to turn, the liquid will continue to be inhaled and discharged.Open pump pressure at the entrance of P1 is equal to or less than with the saturated vapor pressure of liquid temperature PV, liquid vaporization, air bubbles under the effect of high pressure, the rapid condensation or rupture pressure greatly, the impact of high frequency, strong vibration and noise of pump body liquid flow rate and pressure head (outlet pressure) and the efficiency decreases obviously.This nomenon is called cavitation in the open centrifugal pump.