The model of seal mechanism for magnetic fluid and related experimental study
Magnetic fluid is a kind of magneto-rheological fluid. In this paper, the mechanism of magnetic rheology effect was proposed and the yield stress formula of magneto-rheological fluid was derived, based on the dispersion and agglomeration theory of suspension liquid. In accordance with the magnetic rheology effect of magneto-rheological fluid, the computational formula of magnetic liquid seal pressure was concluded, with the seal pressure related to the yield stress of magnetic liquid and the length and clearance of leakproof structure. Using narrow gap magneto-rheological fluid rheology property test system, the yield stress of existing magnetic liquid was tested and an available seal device using magnetic liquid was studied, which proved that the calculation via formula proposed agreed well with the experimental results.