With regard to the working flow of centrifugal pumps, Xiao Bian takes the centrifugal pumps produced by Shenyi Pump Manufacturing Co., Ltd. as an example to analyze. It is mainly carried out from two perspectives, the first is the working point, and the second is the flow regulation.

For the working point, the important thing is the pipeline characteristics of the centrifugal pump. Why? The reason is that the inherent characteristics of the centrifugal pump are unchanged. But once it is applied in different pipelines, its actual working conditions are not only related to its own inherent characteristics, but also depend on the working characteristics of the pipeline. The working point is the intersection of the two specific curves on the coordinates. Therefore, when selecting a centrifugal pump, the flow and pressure head corresponding to this working point should meet the requirements of both the pipeline and the centrifugal pump.

Then analyze the flow regulation. First, change the opening of the valve, that is, change the valve switch on the pipeline at the outlet of the centrifugal pump, in order to change the characteristic curve of the pipeline; When the valve is turned down, the local resistance of the pipeline will increase and the characteristic curve will become steeper. On the contrary, when the valve is turned up, the local resistance of the pipeline will decrease and the characteristic curve will tend to be flat. It is fast and convenient to adjust the flow through the valve. The most important thing is that the flow can change continuously, so it is widely used. The second is to change the speed of the pump, which is also to change the characteristic curve.