Appropriately increase the pump flow rate to improve pump efficiency
2021-11-01
Within a certain flow range, the efficiency curve of a high-flow pump generally envelops that of a low-flow pump. Therefore, increasing the design flow not only improves efficiency but also, more importantly, improves efficiency at the design flow point. Design examples, methods, and principles: In centrifugal pumps, increasing the design flow involves scaling up the given flow rate and specific speed. A larger centrifugal pump is then designed using these scaled-up values, enabling operation at a lower flow rate and thus improving efficiency. As shown in the table and graph, the efficiency curve of the high-flow pump envelops that of the low-flow pump when the flow exceeds a certain point. At this flow rate, the high-flow pump's efficiency is higher, and its head curve completely envelops that of the low-flow pump. Using this method, the flow magnification factor equals the throat diameter magnification factor. For pumps designed this way, the inner diameter of the annular pump body remains unchanged, while the throat is enlarged, and the impeller width is increased. When designing partial flow pumps, the impeller width is generally equal to or slightly larger than the throat diameter.
Within a certain flow range, the efficiency curve of the large flow pump basically envelopes the efficiency curve of the small flow pump. Therefore, if the design method of increasing the flow is adopted, not only the efficiency is improved, but the most important thing is to improve the efficiency of the design flow point. Design Product Example Design Method Design Principle The method of increasing the flow design in a centrifugal pump is to amplify the given flow and specific speed, and use the amplified flow and specific speed to design a larger centrifugal pump to make it work under a smaller flow rate, thus improving the pump's efficiency to a certain extent. If the flow rate is increased to the table and graph, it can be seen that the efficiency curve of the large flow pump envelops the efficiency curve of the small flow pump after the flow rate is greater, and the efficiency of the small flow pump is higher at the flow rate and the large flow pump's head curve completely envelops the head curve of the small flow pump. Adopting the design method of increasing the flow rate, the flow rate magnification factor is equal to the magnification factor of each throat diameter. For the pump designed with the increasing flow method, the inner diameter of the annular pump body has not changed, and the throat is enlarged and the width of the impeller is enlarged. Generally, the width of the impeller is equal to or slightly larger than the diameter of the throat.
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