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

介绍了进气节的节能原理及进气节装置的应用范围和使用法。

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.

文介绍了离心泵节能的主要技术，并提出了前置导叶节的节能技术。