Analysis On Thermal-fluid-structural Coupling Of Lubrication System For Spiral Groove Mechanical Seal

The spiral groove mechanical seal is a hydrodynamic seal, which is realized by based on the spiral groove on the sealing surface. The wedge pressure that the seal generated took the medium into the seal clearance to form fluid-film, thus a lubrication system of dynamic ring- film- static ring was formed. As a result, the sealing face only has the internal friction between the fluids and avoids the direct contact between the dynamic and static ring. So it is small leakage, the little wear, the long service life and the prominent economy. However, with the growth of the parameters of the seal medium, the sealing performance deteriorates rapidly, which will cause sealing ring uneven stress, leading to the sealing ring friction, wear and heat crack. So the fluid- film and the sealing ring is a coupling relationship, and it is more close to the actual to use coupling theory to study them.Firstly, three-dimensional finite element models were established for spiral groove and non-groove face, then the dynamic characteristics of the fluid-films are simulated to get their pressure field, which verify that the sealing face with spiral groove has obvious hydrodynamic effects. At the same time, a comparative analysis is done to study the effect of the rotation speed and the different pressure of medium on the sealing performances; Secondly, based on one-way coupling analysis theory, the friction model is build, and then the completed fields are analyzed to the fluid- field, the distribution laws are obtained. After that, the results of pressure and temperature are loaded separately into the static analysis of sealing ring as the boundary conditions for coupling analysis to get the maximum stress and strain of sealing sing respectively. Also, the influences of the rotation speed, the different pressure and the viscosity of medium on the deformation of sealing ring are explored.