Multi-Objective Optimization Design of Injection Pump Head Structure
Objective To improve the flow stability of the injection pump head flow 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 the flow 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-Ⅱ multi-objective optimization design was made for flow resistance and flow rate.Results Optimized injection pump head structural parameters with low flow resistance and wide flow 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 minimum flow resistance and maximum flow velocity in the flow channel could be selected.Conclusion The structural parameter that has the greatest impact on the flow resistance and flow 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 the flow 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 outlet flow rate,thereby improving the flow stability of the injection pump head channel.
injection pumppump head structureflow stabilitycomputational fluid dynamicsNSGA-Ⅱ
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