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离心式水泵需要灌水来制造真空,因为泵内叶轮旋转甩水形成真空才能吸水,如果泵内没有水,泵叶只甩空气是甩不出真空来的。这是一条基本常识。
Centrifugal pumps need to be filled with water to create a vacuum because the impeller in the pump rotates to create a vacuum that absorbs water. If there is no water in the pump, the pump leaves only the air and the vacuum is lost. This is a basic common sense.