Numerical simulation research on pressure self-adaptive mechanical seal

LI Xi-yuan，ZHANG Qiu-xiang，CAI Ji-ning，LI Shuang-xi

（College of Mechanical and Electrical Engineering，Beijing University of Chemical Technology，Beijing 100029，China）

Abstract：Aiming at seal face deformation and sealing performance of pressure self- adaptive mechanical seal in the high pressure operating mode，the liquid film of sealing gap and seal ring were simulated and analyzed separately in the operating mode of 15.9 MPa，by using computational fluid dynamics software FLUENT and the finite element analysis software Mechanical APDL，and then the calculated flow state of liquid film and the deformation results of sealing ring were computed in the way of fluid-solid coupling. The influence of liquid film was analyzed on the sealing performance and the variation of sealing performance parameters in the actual working condition of pressure is gradually increased. The results indicate that the seal face deformation meet the design needs in high pressure，and the opening pressure is about 3 MPa. The opening force is 67.6 kN，the leakage is 0.04 m3/h，and the balance liquid film is 2.8 μm. Compared with other types of mechanical seals，numerical simulation results indicated that the new type of seal can be able to provide sufficient opening force under high pressure and have a small leakage under low pressure.