注射泵泵头结构的多目标优化设计

Multi-Objective Optimization Design of Injection Pump Head Structure

目的应用正交试验、计算流体动力学(Computational Fluid Dynamics,CFD)分析以及多目标优化设计方法NSGA-Ⅱ,提高注射泵泵头流道的流量稳定性。方法对注射泵泵头流道结构中的柱塞杆腔通径、出口单向阀通径以及两者间的连接腔通径3个结构参数做正交试验设计、CFD分析,并针对流阻、流速做NSGA-Ⅱ多目标优化设计。结果获得了低流阻的、宽流速范围的优化注射泵泵头结构参数。在Pareto最优解集中,可选取流道流阻最小时和流道流速最大时对应的注射泵泵头结构参数最优解。结论对注射泵泵头流道流阻、流速影响最大的结构参数为连接腔通径,且柱塞杆腔通径和出口单向阀通径两个参数的灵敏度接近。减小柱塞杆腔通径、出口单向阀通径以及连接腔通径,能够有效降低因高压工况带来的泵头流道流动阻力;适当增大柱塞杆腔通径、出口单向阀通径以及连接腔通径,能够有效地增大出口流速,从而提高注射泵泵头流道的流量稳定性。

Objective To improve theflow stability of the injection pump headflow channel by using orthogonal experimental design,computational fluid dynamics(CFD)analysis,and multi-objective optimization design method NSGA-Ⅱ.Methods Orthogonal experimental design and CFD analysis were carried out for the three structural parameters in theflow channel structure of the pump head of the injection pump,the diameter of the plunger rod cavity,the diameter of the outlet one-way valve cavity and the diameter of the connecting cavity between them.NSGA-Ⅱmulti-objective optimization design was made forflow resistance andflow rate.Results Optimized injection pump head structural parameters with lowflow resistance and wideflow rate range were obtained.In the Pareto optimal solution set,the optimal solution for the structural parameters of the injection pump head corresponding to the minimumflow resistance and maximumflow velocity in theflow channel could be selected.Conclusion The structural parameter that has the greatest impact on theflow resistance andflow rate of the injection pump head channel is the diameter of the connecting chamber,while the sensitivity of the plunger rod chamber diameter and the outlet one-way valve chamber diameter are similar.Reducing the diameter of the plunger rod chamber,outlet one-way valve,and connecting chamber can effectively reduce theflow resistance of the pump head flow channel caused by high-pressure working conditions;Properly increasing the diameter of the plunger rod chamber,outlet one-way valve,and connecting chamber can effectively increase the outletflow rate,thereby improving theflow stability of the injection pump head channel.