Study on the sealing performance of liquid lubricated end face seal of inlet-return groove
In order to further probe into the influence rules of different combined groove configurations on the comprehensive performance of the mechanical seal,the quasi-three-dimensional thermal-hydrodynamic-lubricated model of the inlet-return groove liquid-face-lubricated seal was established considering mass conservation and energy conservation.Under the premise of validating accuracy of the model,the SUPG finite element method was applied to iteratively coupled solution of the pressure and temperature of liquid film,and the end face temperature of the sealing ring so as to analyze seal face state and the influence rules of sealing performance parameters.Through the analysis of the end face field,the mechanisms of the"hydrodynamic pumping pressurization"of the inlet-groove and the"cavitation dragging reflux"of the return-groove were revealed.Under operating conditions of ps=1 MPa,n=3 000 r/min,and h0=1.5 μm,the dynamic load-bearing,lubrication and heat dissipation capacity of the seal face are effectively optimized,and the face leakage is effectively suppressed,by increasing the circumferential length of the inlet-groove,enlarging the returning-radial-position ratio,adjusting inlet-diameter-depth ratio to 0.52～0.60 and the ratio of circumferential length and radial width of return-groove to(13.5～14.5)/(1～2),and setting the depth of inlet-groove to 4～6 μm and the depth of return-groove to 2～3 μm.The research results can provide a reference for the design of this type of seal.
inlet-groovereturn-grooveend face sealshydrodynamic lubrication,leakage
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