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以某型核主泵用流体动压型机械密封为对象,考虑密封环组件的接触和密封端面的流固耦合作用,建立了密封组件三维多场耦合模型,结合有限差分法和有限单元法,采用数值迭代技术进行了耦合场的计算.研究了高压下密封端面变形的特点和规律,分析了密封压力对密封性能的影响作用.结果表明:密封环端面产生径向收敛锥度和周向波度,高压侧密封深槽对密封端面周向波度的生成起重要作用,密封端面锥度的形成与密封环宏观结构密切相关.随密封压力的增大,密封端面收敛锥度和波度均增大,密封泄漏率增加,而端面摩擦系数减小.为在高压下形成较大的波度,建议将动压深槽加工在软质密封环端面上.
Taking a hydrodynamic mechanical seal of a certain type of nuclear main pump as an object, a three-dimensional multi-field coupled model of the seal assembly was established considering the contact between the seal ring assembly and the fluid-solid coupling of the seal end face. Combined with finite difference method and finite element method, The calculation of the coupling field is carried out by using the numerical iteration technique. The characteristics and rules of the deformation of the seal face under high pressure are studied. The effect of the seal pressure on the seal performance is analyzed. The results show that the radial convergence taper and the circumferential wave- The formation of seal face taper is closely related to the macroscopic structure of the seal ring.With the increase of seal pressure, the taper and the wavefront of seal face increase, and the seal leakage rate increases , While the friction coefficient of the end face is reduced.For the formation of high wave pressure under high pressure, it is suggested that the dynamic pressure deep groove be machined on the end face of the soft seal ring.