By the application of multiple impeller, static pressure control loop and helical balancing drum, the problems of low lift and liquid reserves shortage caused by siphonage in common self-priming pump are resolved. 通过多级叶轮、静压控制回路和螺旋平衡鼓的应用,解决了普通自吸泵扬程低和虹吸造成储液量不足问题。