Theoretical analysis and experimental study on loading process among stages of magnetic fluid seal

A new experimental setup was designed in order to study the loading process among stages of magnetic fluid seal. Magnetic field distributions under the pole pieces of the magnetic fluid seal with six stages were simulated by finite element method, and the results proved its rationality. A series of tests on experimental setup were run in order to study the way of pressure transmission among stages of magnetic fluid seal and to extend our knowledge on the mechanism of seal operation. The results of the experiments not only proved the correctness of the corollaries of previous researchers and more detailedly shows the way of pressure transmission in each stage. A mathematical model of the way of pressure transmission among stages of magnetic fluid sea was constructed by previous inference and the present experimental results, and it is able to express the specific way of pressure transmission at certain extent. The experimental conclusion also shows that the quantity of magnetic liquid in each stage will be redistributed and the quantity of magnetic liquid in each stage may be unevenly distributed when the pressure of the pressure chamber is imposed. It has a certain value of reference in the improvement of design and structure process of magnetic fluid seal in engineering problem.