基于CAD系统的离心泵叶轮轴面投影绘型

在CAD系统中，离心泵叶轮的轴面绘型一般均采用试凑法，即通过反复的数据修改给出轴面流线而得到轴面绘型．这种设计方法使设计存在一定的盲目性．针对上述问题，结合离心泵优秀水力模型，利用数理统计的方法对不同比转数的优秀水力模型的流道中线进行了统计分析，并利用非线性回归对统计结果进行了处理，拟合出了平均比转数与流道中线上点的函数关系．在此基础上，采用F-L曲线的给定方法，推导了前后盖板流线的方程，从而给出了轴面绘型的全过程．经实例验证，该方法是可行的，并且具有较高的实用价值．

Research based on CAD system of drawing meridional plane in impeller of centrifugal pump

The method of drawing the centrifugal pump impeller meridional plane in the CAD system is by trying and collecting, that to say is, by modify the data again and again to adapt the design. This method causes blindness. In this article, the author puts forward to the method of flow path center line to design impeller from the flow path center line of excellent hydraulic model, and. meanwhile using mathematics statistic and non-linear regression to deal with the data. The function between the numbers of average ns and the points of flow path center lines can be obtained. On this foundation, the F - L curve and educe the equation of front and behind blades were deduced,which provides the whole course of drawing meridional plane. Examples show that method is feasible and has very high practical value.