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平衡腔内的压力分布是浮动叶轮实现轴向力自动平衡的关键所在。引用加大后的叶轮后密封环直径和叶轮平衡孔的面积这2个重要设计参数,建立不同参数组合下的3BA-6单级单吸离心泵三维模型,运用CFD理论对其进行数值模拟,得到平衡腔内的压力分布,并进行轴向合力计算与平衡分析,同时在水泵开式试验台上实测平衡腔内的压力。结果表明:当水泵工作流量位于0.002~0.006 m3/s这一区域时,取k=1.2,A=7.07 mm2,水泵可以通过采用浮动叶轮来实现其轴向力的平衡。平衡腔内压力p为相应工况下扬程的13%~20%。模拟值与实测值吻合较好,验证了数值方法的正确性。运用CFD技术,通过参数的改变,找到最优设计方案,为其结构设计提供重要的实践指导意义。
The pressure distribution in the balance cavity is the key to the floating impeller to achieve the automatic balance of the axial force. The three-dimensional model of 3BA-6 single-stage single-suction centrifugal pump under different combinations of parameters was established by using the two important design parameters of the enlarged impeller seal ring diameter and impeller balance hole area. The CFD theory was used to simulate the three- The pressure distribution in the balance chamber is obtained, and the axial force calculation and balance analysis are carried out. At the same time, the pressure in the balance chamber is measured on the open test bench of the water pump. The results show that when the pump working flow is in the range of 0.002-0.006 m3 / s, k = 1.2 and A = 7.07 mm2, the pump can balance the axial force by using the floating impeller. Balance chamber pressure p is 13% ~ 20% of the head under the corresponding conditions. The simulated value is in good agreement with the measured value, which verifies the correctness of the numerical method. The use of CFD technology, through the change of parameters, to find the optimal design for its structural design provides an important practical guidance.