Abstract:Taking the spiral groove liquid film seal as the research object,the average Reynolds equation considering the flow factor was solved,and the influence of operating and structural parameters on the lubrication state of the seal face was studied.The results show that,with the increasing of speed,the film thickness and bearing coefficient are gradually increased,and the asperity contact force is gradually decreased to zero,which realizes the separation of sealing rings.The medium with low viscosity has a significant effect on the critical speed.The critical speed and the closed force are increased linearly with the increasing of the pressure difference.The critical speed is increased with the increasing of groove depth and helix angle,and decreased with the increasing of the number of groove and the ratio of dam and groove width.The groove depth has the most significant influence among structure parameters.It would have better lubrication transit ability with parameters showed in the paper:groove depth 3~7 μm,helix angle 14°~18°,the number of grooves 16~24,ratio of dam width to groove width 2/3~5/6.