基于辅助线的螺旋离心泵叶轮的水力设计方法改进

Improvement of hydraulic design method for screw centrifugal pump impeller based on auxiliary lines

基于一元理论的设计方法,类比普通离心泵的设计方法对螺旋离心泵叶轮进行水力设计,通过实例详细介绍设计过程,绘制轴面投影图、轴面截线图及叶片剪裁图等.通过对采用传统方法进行的轴面流线分点所出现的一些问题进行分析,提出离心泵叶轮水力设计的改进方法.改进后的方法解决了流线剪裁图上进口边难以确定以及螺旋离心泵叶轮离心部分轮缘处流线走势不易表现等问题.

On the basis of the one-dimensional theory design method and by imitating the design method of ordinary centrifugal pumps the hydraulic design of screw centrifugal pump impeller was performed.By means of an actual example,the design process was introduced in detail and the drawing of axial plane projection,axial section,and streamline clipping were given.Some problems occurred in the process of split point division of the axial streamline with traditional method were analyzed and the improvement method of hydraulic design of centrifugal pump impellers was presented.This method could be used to solve the problems such as the difficulty with the determination of the inlet side during streamline clipping and the difficulty with the presentation of trend of streamline propagation at the centrifugal part of the flange of the screw centrifugal pump impeller.