Dynamic groove optimization of hydrodynamic mechanical seals and determination of heat exchanger area

Considering the problem of easy wearing or burnout of mechanical seal end face for pumps operating at high temperature or pressure,the operating principle of hydrodynamic mechanical seal is described,and the scheme of adopting hot fluid hydrodynamic mechanical seals and API682 32 system as the auxiliary cooling system in high temperature and pressure pumps was introduced.Optimum design of the dynamic groove was made,and the heat exchanger was designed for the mechanical seals system to control the seal working temperature.The results show that when the flush flow rate and the temperature meet the design requirements,the seal end face with arc groove works best and its service life of the seal is up to 8 000 h;the carrying capacity of the fluid film increases with increasing groove number.The heat exchanger with 0.50 m2 heat transfer area is reasonable,and larger heat transfer area is recommended to ensure the temperature of flush water below 100 ℃.