矿用抢险多级泵转子部件轴向力数值模拟及平衡方法研究

Numerical Simulation and Balance Method Research For Axial Force of Rotation Components on Mine Emergency Multi-stage Pump

因对称布置的矿用抢险多级排水泵出口段的轴端水压力较大,无法平衡轴向力,本文采用非对称布置的叶轮导叶结构,其轴向力可达到平衡,本文进一步采用切割末级叶轮后盖板的方式来完全平衡整泵转子的轴向力。基于CFX软件,采用标准k-ε模型对装配了不同尺寸后盖板的叶轮、导叶、进出水段的矿用抢险多级排水泵的全流场模型进行了数值模拟,获得了整泵的外特性及转子部件的轴向力的结果,得到末级叶轮后盖板不同切割尺寸与轴向力的尺寸范围;预估了轴向力完全平衡时,末级叶轮后盖板的切割尺寸,通过数值模拟验证了预估结果。本文所采用的矿用抢险多级泵转子部件轴向力平衡措施以及模拟方法,可为类似的多级泵产品提供参考。

Due to the large pressure at the bottom of the shaft in one kind of mine emergency multi-stage pump with asymmetric impeller-vane structure, and axial force could not be balanced. A pump structure with different impellers＇ number at inlet and outlet was designed,as well as the back shroud of last stage impeller was cut,then the axial force balance of rotation components decreased. Based on CFX software, total flow field of mine emergency muhi-stage draining pump including impeller, guide vane and inlet and outlet sections with varisized back shrouds was numerical simulated by application of the standard k-t： turbulence model. The results of external characteristic of the whole pump and axial force of rotation components were obtained through the simulation, so different cutting size of the back shroud of last stage impeller and the range of axial force were obtained, and the cutting size of back shroud of last stage impeller was predicted in the case of complete balanced axial force, which was verified through numerical simulation. The balance approach of axial force of rotation components in mine emergency multi-stage pump and corresponding simulation method presented in this article is capable of providing a reference for similar multi-stage pumps.