1.This paper introduced the energy saving principle of air intake prerotation adjustment and the application area and method of air intake prerotation regulator.

1.介绍了预旋节节能原理预旋节装用范围和使用方法。

2.This paper introduces the main energy saving technologies of centrifugal pump.And the author proposes a new energy saving technology which is called prerotation regulated by the inlet guide vane.

2.本文介绍了离心泵节能主要技术，并提出了前导叶预旋节节能技术。