低比转速离心泵加大流量设计模型

Model of enlarged flow design for low specific speed centrifugal pump

为了更精确地选用低比转速离心泵加大流量设计法的放大系数,简单介绍了低比转速离心泵加大流量设计的基本原理和设计目标,根据加大流量设计法的基本原理,得到了设计目标的数学公式;根据各参数间的经验数据,组成了求解低比转速离心泵加大流量设计时,求解流量放大系数和比转速放大系数的封闭方程.在此基础上进行了数值求解,得到了比转速在23-90,流量在3-30 m3/h之间的泵采用加大流量设计时,选取流量放大系数和比转速放大系数的系列曲线图.目前已有水力模型的取值,都满足计算得到的系列曲线.

In order to get the enlarged factors accurately, the principle and design aim of the enlarged flow design were briefly introduced. The mathematical formula was derived according to the principle of the enlarged flow design. By the relationship of the empiric data, the equations for the two factors of both enlarged flow and enlarged specific speed were established. The equations were numerically calculated and the corresponding curves were plotted. The curves contain the specific speed from 23 to 90 and flow rate from 3 to 30 cubic meters per hour. The current hydraulic models of the pump agree well with the curves calculated.