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Numerical and experimental study of magnetic fluid seal with large sealing gap and multiple magnetic sources

Science China(Technological Sciences) 2013年第11期56卷 2865-2869页

作者： YANG XiaoLong ZHANG ZhiLi LI DeCai School of Mechanical Electronic and Control EngineeringBeijing Jiaotong University

To improve the pressure capability of magnetic fluid seal with more than a 0.25 mm single edge gap,a magnetic fluid sealing structure with multiple magnetic sources which has five permanent magnets was *** field distributions under the pole pieces of the magnetic fluid seal with single and multiple magnetic sources were simulated by finite element method and its sealing pressure difference could be calculated according to the theoretical formula of the magnetic fluid *** effects of sealing gap height and magnetic source amount on the sealing capability were investigated *** theoretical and experimental results were compared,analyzed and *** results demonstrated that the magnetic fluid seal with multiple magnetic sources was an effective method to improve the sealing capability for the rotary shaft with large *** theoretical results agreed well with the experimental results when the height of the single edge gap was equal to 0.4 ***,it was found that when the height of the single edge gap was larger than 0.4 mm,the difference between the theoretical values and experimental values increased with the gap height because part of magnetic source had less or even no effect on magnetic fluid sealing capability.

关键词： experimental study magnetic fluid multiple magnetic sources numerical simulation seals

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