Magnetic field in the core of a magnetic fluid seal taking magnetic structural elements into account

Abstract

According to the results of the finite element analysis of the magnetic field of the liquid metal seal designed to protect the bearing assembly from external aggressive influences, it is shown that its mounting directly on the bearing shield having magnetic properties leads to an increase in magnetic fluxes of scattering and to a decrease in the peak value of magnetic induction in the working the gap from 1, 6 T to 1,1 T., i.e. to a decrease of 31%. The use of a non-magnetic insert between the seal and the bearing assembly allows this induction to be increased. The dependence of this induction on the thickness of the insert is given, which makes it possible to choose its rational value when installing the seal. It is shown that the use of an additional permanent magnet located in the area of this insert allows one to increase the peak value of magnetic induction in the working gap from 1.3 T to 1.75 T and, as a result, improve the performance of the seal.