Novel method for increasing high linear speed and prolonging sealing life of static magnetic liquid

The invention provides a novel method for increasing high linear speed and prolonging the sealing life of static magnetic liquid, and belongs to the field of mechanical engineering sealing. The method solves the problem that the calorific value of magnetic liquid in a sealing gap of an existing magnetic liquid rotary sealing device is too high and accordingly service life is lowered, and solves the problem that in the static sealing process, a magnetic liquid agglomeration phenomenon occurs due to the action of a long-time stable strong magnetic field, and accordingly sealing performance is reduced. According to the method, outer cylindrical faces of N cylindrical permanent magnets (3) are sleeved with N iron core rings (9), and electromagnetic coils are wound around the outer cylindrical faces of the N cylindrical permanent magnets provided with the iron core rings. The electromagnetic coils are connected with an external power supply to generate an electromagnetic field; by changing the direction and the size of current and changing the magnetic field intensity applied to the magnetic liquid, problems existing when the magnetic liquid is used in rotation sealing of the high linear speed and static sealing can be solved; the iron core structure can increase the intensity of the electromagnetic field, improves the magnetism gathering effect and further prolongs the service life of the magnetic liquid.