Abstract:Magnetic liquid can be used as a lubrication medium of noncontact mechanical seal face for its viscosity can be changed by the external magnetic field intensity,the hydrodynamic performance of magnetic liquid membrane can be controlled by changing the external magnetic field intensity.In order to improve seal performance of magnetic liquid hydrodynamic mechanical seal,the magnetic field generator was designed,which can produce different dynamic pressure by changing the current to adjust the viscosity of liquid membrane,and realize dynamic pressure effect control of fluid membrane.Through numerical analysis method,the magnetic field was analyzed of magnetic transmitting structure which consisted of moving ring and static ring,liquid membrane and magnetic field generator,and the magnetic force lines,magnetic field intensity and magnetic induction intensity distribution laws of magnetic transmitting structure were obtained.The results show that almost all magnetic force lines in the magnetic structure pass through the seal face,and the magnetic field intensity in sealing gap reaches the highest level.The magnetic force lines in the direction of perpendicular to the seal face have a certain magnetic field gradient,and liquid membrane in the magnetic field intensity is proportional to the current strength of the magnetic field generator.