在北方高扬程抽水地区,由于地形和水资源等基本条件的限制,耕地田块大小不一,需抽水的高程千差万别。在现有高扬程水泵系列中,离心泵的性能较能适应这种情况。但是,由于其有限的品种与实际需要差距较大,从而给抽水站的水泵选型造成困难。为了满足实际需要,在水泵选型中,根据水泵的性能特点,变动水泵的工作扬程,调整水泵的设计流量。这种变工况的处理方法,使 In the area of ​​high-lift pumping in the north, due to the restriction of basic conditions such as terrain and water resources, cultivated land plots vary in size and require different levels of pumping. In the existing high-head pump series, centrifugal pump performance to adapt to this situation. However, due to the large gap between the limited varieties and the actual needs, it is difficult to pump the pumping station. In order to meet the actual needs of the pump selection, according to the performance characteristics of the pump, change the working lift of the pump, adjust the pump design flow. This change of working conditions, so that