【摘要】 基于双向双列菱形孔织构端面流体密封的理论控制模型,采用有限元分析的方法研究菱形孔结构、排布方式和工况参数对密封性能的影响规律,研究菱形孔双向泵送作用对机械密封动压润滑性能影响规律及内在运行机制。结果表明:随外压增大,内外径处的压差逐渐增强,开启力和泄漏率逐渐增大,液膜刚度是先减再增而后减小;随转速增加,开启力、液膜刚度和泄漏率均呈快速增大的变化趋势;随着基础膜厚增大,开启力、液膜刚度先快后缓慢减小,而泄漏率则迅速增加;端面加工出的双向双列菱形孔织构可将间隙内流体进行回吸,从而减少泄漏率,提高了端面间隙的润滑性能,通过排布形式各异的菱形孔及结构参数的优化设计可实现密封特性的提升。更多还原

【Abstract】 Based on the theoretical control model of end face fluid seal with bidirectional and double row diamond pores textured,the influence law of diamond pores structure,arrangement mode and operating condition parameters on seal performance was studied by method of finite element analysis,and the influence of bidirectional pumping function of diamond pores on dynamic pressure lubrication performance of mechanical seal was studied.The results show that with the increase of the outer pressure,the pressure difference at inside and outside diameters is gradually increased,the open force and leakage rate are increase,and liquid film stiffness is first decreased,then increased,and then decreased.With the increase of the speed,the open force,liquid film stiffness and leakage rate all show a trend of rapid increase.With the increase of basis film thickness,the open force and liquid film stiffness are increased first then decreased slowly,while the leakage rate is increased rapidly.It is shown that the bi-directional two-row diamond pores texture produced in the end faces can suck back the fluid in the gap,reduce the leakage rate and improve the lubrication performance of the end faces gap,the improvement of sealing characteristics is achieved through the arrangement of different diamond pores and the optimal design of structural parameters.更多还原