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针对现有干气密封在高速条件下所存在的泄漏率大、气膜刚度不足等问题,在干气密封螺旋槽结构的基础上,基于叠加组合思想提出一种似叠罗汉槽端面密封结构.基于气体润滑理论,建立了似叠罗汉槽端面的几何模型和数学模型,采用有限差分法求解二维稳态雷诺方程,获得了密封端面压力分布.以气膜刚度最大作为优化目标,对比分析了不同结构型式的优选叠加组合槽干气密封与普通螺旋槽干气密封的密封性能参数,数值分析了周向槽宽比、径向槽宽比和槽深比等结构参数对似叠罗汉槽干气密封性能的影响规律,获得了似叠罗汉槽主要结构参数的优选值范围.结果表明:在高速低压条件下,相较于普通螺旋槽干气密封,似叠罗汉槽干气密封在泄漏率基本不变的同时能显著提升气膜刚度,综合密封性能显著提升,且转速越高,压力越小,这种性能优势越明显.
Aiming at the problems such as large leakage rate and insufficient rigidity of gas film under the condition of high speed, the existing dry gas seal is proposed based on the idea of superposition and combination in the dry gas sealed spiral groove structure. Gas lubrication theory, the geometrical model and mathematic model of the end face of a stack-like Lohan tank are established, and the two-dimensional steady-state Reynolds equation is solved by using the finite difference method, and the pressure distribution of the sealed end face is obtained.With the maximum film stiffness as the optimization objective, Type of preferred combination of combined slot dry gas seal and common spiral groove dry gas seal performance parameters, the numerical analysis of the circumferential groove width ratio, radial groove width ratio and groove depth ratio of the parameters such as the overlap of the gas tank dry gas seal performance The results show that under the condition of high speed and low pressure, the dry gas seal of the stack-like Lukhan tank has the same leakage rate as that of the ordinary spiral groove dry gas seal, meanwhile, Can significantly enhance the stiffness of the gas film, the comprehensive sealing performance significantly improved, and the higher the speed, the smaller the pressure, the more obvious this performance advantage.