End face deformation and friction and wear of high-speed dry friction mechanical seal

In order to solve the problem of seal failure caused by excessive deformation and wear of mechanical seal end face due to improper design under high-speed dry friction conditions,a thermal structure coupled numerical calculation model was established to analyze the temperature field and end face deformation of mechanical seal. The temperature rise of the stationary ring was tested,the characteristics of the end face of the stationary ring were analyzed,and the wear mechanism under high speed dry friction was discussed. The results show that: the established finite element model can accurately predict the temperature and end face deformation of the seal,and the difference between the calculated value and the experimental value is less than 11%; the peak temperature of the seal end face is more sensitive to the rotating speed,and with the extension of the operating time,the temperature first increases rapidly and then gradually slows down; the static ring is prone to taper deformation,resulting in the uneven contact pressure and wear of the end face,and the "correction" effect of the stationary ring seat can improve this kind of deformation; the existence of friction transfer film plays a key role in the temperature rise and surface roughness of the seal. The moving ring surface is sprayed with Cr2O3 metal oxides,which can better maintain the dense graphite transfer film and reduce the wear of the seal. The research results provide a basis for the design,optimization and application of mechanical seals. © 2022 Beijing University of Aeronautics and Astronautics (BUAA). All rights reserved.