Abstract
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. DOI: http://dx.doi.org/10.5755/j01.mech.22.4.16156
Highlights
Magnetic liquid as a kind of new functional material, magnetic fluid sealing is the most important application
This paper obtains from the magnetorheological effect of magnetic fluid, the yield stress formula of magnetic liquid was deduced, based on the the yield stress formula of magnetic liquid, The mechanism of magnetic fluid seal is analyzed, the pressure formula of magnetic fluid seal is Concluded, and the experimental investigation was conducted
3L 0 b where b is the gap between magnetic shaft and the teeth of magnetic pole shoes, L is the length of each tooth and τ0 is the yield stress of magnetic fluid which can be determined in experiments
Summary
Magnetic liquid as a kind of new functional material, magnetic fluid sealing is the most important application. Reciprocating shaft seal of magnetic liquid in the theory, experimental research and practical application are not mature, the mainly problems include: 1) How to accurately draw the quantitative relationship between the parameters of movement of the reciprocating shaft and parameters of seal structure with the compression ability? 2) How to analyze the flow mechanism of magnetic liquid inside sealing gap? 3) How to accurately draw the motion state of magnetic fluid when the reciprocating shaft moves [3]. This paper obtains from the magnetorheological effect of magnetic fluid, the yield stress formula of magnetic liquid was deduced, based on the the yield stress formula of magnetic liquid, The mechanism of magnetic fluid seal is analyzed, the pressure formula of magnetic fluid seal is Concluded, and the experimental investigation was conducted
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