Optimization on Parameters of Mechanical Seal Spiral Groove Based on Orthogonal Test

End face cavitation easily occurs iNmechanical seal of centrifugal pump during operation, which affects the reliability and stability of the equipment operation. In order to study the influence of end face cavitation of spiral groove on the mechanical seal performance, taking the leakage Q and opening force F as the optimization objectives, and the groove depth h, groove diameter ratio β, spiral angle θ, groove Nmber n and groove position coefficient λ as variables, an orthogonal test table was established, and the CFD method was used to conduct Nmerical simulation on the flow field of the sealing film. The study results show that the influence of λ on opening force and leakage is remarkable, followed by n; when λ≠0, the cavitation inside the liquid film is intense, which affects the sealing stability; when λ=0, based on orthogonal test method, the optimal working condition curve method of multiple objective parameters is put forward for the first time; then, taking P(leakage increment ΔQ/opening force increment ΔF)as the optimization evaluation index, 6 groups of optimal working condition points are obtained, and the optimal working condition curve is obtained by fitting, which provides a theoretical basis for the selection and optimization of spiral groove structure. The study based on the optimal working condition curve method solves the multi-objective optimization problem of orthogonal test and is universal.