外啮合直齿轮泵的耳型浮动套筒参数优化

Parameters optimization of ear-type floating sleeve in external spur-gear pump

为了减少外啮合直齿轮泵的主、从动齿轮与其端面浮动套筒间的磨损,进而提高齿轮泵的容积效率及使用寿命,分析了齿轮泵端面磨损的机理,得出其所受合力与力矩不平衡是产生磨损的根本原因.由齿轮泵主要参数推导出了其外侧受力与力矩的表达式.基于遗传算法,以耳型浮动套筒所受合力为目标函数,以耳型浮动套筒密封圈的外径、内径、角度和弹性强度作为自变量,在力矩平衡和密封圈宽度的约束条件下,求得当目标函数最小时自变量的值.最后分别对参数优化前后浮动套筒的外啮合直齿轮泵建模并导入PUMPLINX中进行数值模拟,通过对比分析后发现,优化后的耳型浮动套筒所受合力基本为零,受力条件得到改善.本研究可为齿轮泵的密封设计提供技术参考.

To reduce the friction among the main gears,driven gears and their end face floating sleeve in external spur-gear pumps,and enhance the volume efficiency and fatigue life,the mechanism of end wear of gear pump was analyzed firstly,and it is concluded that the unbalance of force and moment of the floating sleeve is the cause of wear. The expression of outboard force and moment were deduced.Based on genetic algorithm,the resultant and resultant moment of the ear-type floating sleeve were taken as objective functions. And the outer diameter,inner diameter,angle and elastic strength of the seal ring of floating sleeve were taken as independent variables. Under the restrained conditions of moment balance and width of seal ring,the values of the independent variables were obtained when the objective function was minimum. At last,numerical simulation was carried out on external spur-gear pump with non-optimized and ear-type floating sleeve by PUMPLINX. The numerical simulation of gear pump with optimized floating sleeve shows that the resultant force of the floating sleeve is almost zero.Then the rationality of the optimum design of the floating sleeve was verified. The research can provide technical reference for gear pump sealing design.