Centrifugal pump is a vane pump, relying on the rotating impeller in the rotating process, due to the interaction between the blade and the liquid, the blade will transfer mechanical energy to the liquid, so that the pressure of the liquid can be increased, to achieve the purpose of transporting liquid. Four points should be paid attention to when starting a centrifugal pump.
(1) the centrifugal pump has a limited value at a certain speed. The flow rate and shaft power at the operating point depend on the condition of the device system connected to the pump (position difference, pressure difference and pipeline loss). The lift varies with the flow rate.
2. Stable operation, continuous conveying, no pulse flow and pressure.
Generally, there is no self sucking ability. It is necessary to fill the liquid first or pump the pipeline into vacuum before it can start work.
(4) The centrifugal pump starts when the discharge pipeline valve is closed, and the vortex pump and the axial flow pump start when the valve is fully open to reduce the starting power.
Because the centrifugal pump relies on centrifugal impeller force to form a vacuum suction to lift water, so when the centrifugal pump starts, must first close the gate valve, irrigation. The water level exceeds the impeller position and the air in the centrifugal pump can be discharged to start. After starting, a vacuum is formed around the impeller to suck up the water, and the gate valve can be automatically opened to lift the water. Therefore, we must first close the gate valve.
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