Vaned mixed-flow pump is widely used for liquid transportation in industry and agriculture. The structural-asymmetricity induces large axial force which causes axial vibration and shaft system damage. In this study, impeller forces are analyzed and optimized based on numerical simulation and experiment. Balance holes and a balance plate are used in cooperation. Orthogonal experiment is conducted to analyze the effects of balance hole diameter, sealing clearance width on the hub, and balance plate clearance width on axial force at design condition. Then, BP-artificial neural network is established with Global Dynamic Criterion algorithm. Efficiency and axial force at design condition are chosen as optimization objectives. The results prove that optimized pump has lower axial force and higher efficiency at design condition. The head coefficient meets design requirement. Accordingly, a cooperative method named the ‘Combining Hole-Plate Pressure Balancing Method’, made by adding balance holes and installing a balance plate in the hub clearance chamber, is proposed. The method can effectively reduce axial force and improve the adverse effect of axial force on the pump without obvious influence on hydraulic performance. This study is significant as a means to reduce axial force, lessen damage to a shaft system, and improve operation stability.

叶片式混流泵广泛用于工业和农业中的液体运输。结构不对称会引起较大的轴向力，从而导致轴向振动和轴系统损坏。在这项研究中，基于数值模拟和实验对叶轮力进行了分析和优化。平衡孔和平衡板配合使用。在设计条件下，通过正交试验分析了平衡孔直径，轮毂上的密封间隙宽度以及平衡板间隙宽度对轴向力的影响。然后，利用全局动态准则算法建立了BP人工神经网络。选择设计条件下的效率和轴向力作为优化目标。结果表明，在设计条件下，优化后的泵具有较低的轴向力和较高的效率。扬程系数满足设计要求。因此，提出了一种通过增加平衡孔并将平衡板安装在轮毂间隙室中而形成的称为“结合孔-板压力平衡方法”的协作方法。该方法可有效减小轴向力，改善轴向力对泵的不利影响，而对液压性能无明显影响。这项研究对于减少轴向力，减少对轴系统的损坏并提高操作稳定性具有重要意义。该方法可有效减小轴向力，改善轴向力对泵的不利影响，而对液压性能无明显影响。这项研究对于减少轴向力，减少对轴系统的损坏并提高操作稳定性具有重要意义。该方法可有效减小轴向力，改善轴向力对泵的不利影响，而对液压性能无明显影响。这项研究对于减少轴向力，减少对轴系统的损害并提高操作稳定性具有重要意义。