Abstract:

As for the end face of a new irregular V-shaped surface textured mechanical seal, the lubrication model of the liquid film was established, and the Reynolds equation was solved by the finite element method (FEM). The influences of the area ratio (AR), depth ratio, characteristic number and pressure of seal medium on the seal performance such as load-carrying capacity (LCC), leakage rate, friction coefficient and liquid film stiffness of the seal face were investigated, and the classical triangular texture and circular textured face seals were comparatively analyzed. The results showed that the new irregular V-shaped texture on the seal face had the function of collecting and converging liquid film and enhanced the hydrodynamic effect. The AR, depth ratio, characteristic number and pressure of the sealing medium had a great influence on the seal performance of the V-shaped and triangular textures, but had little effect on that of the circular textures. The seal performance of the new V-shaped surface textured mechanical seal was relatively better based on the research geometry and working conditions, and its LCC, friction coefficient and liquid film stiffness were slightly better than those of the circular texture, and far better than that of the circular texture. Although the leakage rate of the V-shaped texture was slightly lower than that of the triangular texture, it presented an increasing trend. When the AR was greater than 10% and the depth ratio was greater than 1.00, the V-shaped texture had more advantages than the triangular and circular texture. And when the depth ratio was about 1.77 and 1.50, the V-shaped texture had the maximum LCC and liquid film stiffness, respectively. Under the different sealing pressures, the liquid film stiffness of the V-shaped texture was twice that of the triangle texture. The findings can provide support for the design and development of textured face seals.

Key words: surface, texture, finite element method, numerical simulation, seal performance, microscale

摘要：

针对一种新型非规则V形表面织构化机械密封端面，建立了界面液膜的润滑模型，采用有限单元方法求解雷诺方程，研究了表面织构开孔面积比、深度比、特征数和密封介质压力对端面密封的承载力、泄漏率、摩擦因数和液膜刚度等密封性能参数的影响规律，并对经典三角形织构和圆形织构化端面密封进行了对比分析。结果表明：端面新型非规则V形织构具有收集和汇聚液膜的作用，增强了动压效应；织构开孔面积比、深度比、特征数和密封介质压力的变化对V形与三角形表面织构的密封性能影响较大，而对圆形织构表面的密封性能影响不明显；在研究几何和工况参数范围内，这种新型V形表面织构的机械密封性能相对较优，其承载力、摩擦因数与液膜刚度均略优于三角形织构，远优于圆形织构，研究结果可为织构化端面密封的设计开发提供支持。

关键词: 表面, 织构, 有限元方法, 数值模拟, 密封性能, 微尺度