Research On Friction Properties Of Surface Texture Of Dynamic Seal Components

Dynamic seals are apply to machine parts which have relative motions. These components can prevent the leak of fluid, gas and particles from couples surface gap. Dynamic seal components can be classified by rotating seals and reciprocating seals according to movement type. Mechanical seals and compressor vanes are the most common components in these two types. Domestic and foreign scholars research seal materials, coating and so on to improve tribology performance of dynamic seal components. As an effective measures to improve tribology performance, surface texture technology has been widely used in tribology field. This study focused on researching the characteristics of mechanical seals and compressor vanes with surface texture from theoretical analysis.In order to study sealing performance of mechanical seals with surface texture, the commercial software FLUENT was used to analysis flow field of seal face. Micro grooves used in mechanical seal was one kind of patterns of surface texture. The ratio of width, depth and length and the angle of inclination of grooves were studied. The research figured out that the best depth ratio was 0.75, and width ratio was 0.8. Under the same width ration, the more groove width existed, the better sealing performance of mechanical seal performed. The inclined groove had higher opening force and film stiffness than the radial line groove. It had lower rate of leakage since sealing medium could be pulled back to sealing chamber by inclined groove. When the angle of inclination was 60°, and the range of length ratio was 0.6-0.8, computational results showed the best sealing performance.As an important object of study in tribology field, micro dimples texture were used in compressor vane to reduce wear and friction. A computational model of fluid lubrication was developed based on Reynolds equation by the software of Matlab. This paper got discretization equation by finite difference method. In order to accelerate convergence, multi-grinder method were used. And then the depth, area ratio, radius of dimple and rotate speed of crank were researched. The results showed that the best depth of dimple were linked to the film thickness. The average film thickness would reach the maximum and the minimum of amplitude of curve of film thickness will obtain, when the area ratio of texture was 0.05. However, the area ratio had little impact on average film thickness. On the other hand, film thickness would increase by the increasing of radius of dimple and rotate speed. Whereas, the increasing of rotate speed would make the amplitude of curves larger. Instead, the bigger radius would reduce amplitude.