环形蠕动微泵的优化仿真和实验

Simulation and Experiments for Optimization of Circular Peristaltic Micropumps

本文分析了矩形截面环形蠕动微泵存在的泄漏问题及其对微泵性能的影响,减小泄漏是提高微泵背压和自吸能力的有效途径.通过Ansys有限元建立二维接触模型,模拟了各参数项对微泵泄漏率的影响,得出影响微泵泄漏率的主要参数为深宽比和挤压力,在一定范围内,深宽比越小、挤压力越大,则密封性越好,通过仿真拟合得到了计算泄漏率的近似公式;根据计算结果,设计制作了具有不同深宽比参数和不同挤压力的微泵,并对比测量了不同参数微泵的流量及背压,实现了最小2%的实际泄漏率.实验结果表明通过仿真拟合公式计算得到的泄漏率与实测泄漏率具有较好的吻合性.通过拟合公式优化设计微泵的结构参数,可有效降低微泵泄漏率,提高流量控制准确性,增大背压和自吸能力.

Leakage of the peristaltic micropumps with typical rectangular cross section and its influence on pump performance were analyzed,which identifies that reduction of the leakage can enhance the pumping pressure and self-pumping ability of the micropump.The influence of parameters on leakage ratio of the micropump was simulated based on the 2D contact model established with Ansys finite element analysis method and it was concluded that the aspect ratio and pressing force were the main parameters that had impac...