Analysis of centrifugal pump starting principle

Analysis of centrifugal pump starting principle

A centrifugal pump is a vane pump. During the rotation of the impeller, due to the interaction between the blade and the liquid, the blade transfers mechanical energy to the liquid, which increases the pressure energy of the liquid and achieves the purpose of conveying liquid. The centrifugal pump has the following characteristics:
① The lift generated by a centrifugal pump at a certain speed has a limited value. The operating point flow and shaft power depend on the condition of the installation system (position difference, pressure difference, and line loss) connected to the pump. The head changes with the flow.
② Stable operation, continuous delivery, no flow and pressure pulsation.
③ Generally there is no self-priming ability, and the pump needs to be filled with liquid or the pipeline must be evacuated before it can start working.
④ The centrifugal pump is started with the discharge line valve closed, and the vortex pump and axial flow pump are started with the valve fully open to reduce the starting power.
The centrifugal pump lifts the water by the suction force of the centrifugal force of the impeller to form a vacuum. Therefore, when the centrifugal pump starts, the gate valve must be closed and the water is filled. The water level exceeds the impeller, and the air in the centrifugal pump is exhausted before starting. After starting, a vacuum is formed around the impeller to suck up the water, and its gate valve can automatically open to lift the water. Therefore, the gate valve must be closed first.

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