大间隙阶梯式磁性液体旋转密封的理论及实验研究

发布时间：2019-05-10 12:37

【摘要】：为了提高大间隙条件下磁性液体密封的耐压能力,本文创造性地提出了一种新型的阶梯式磁性液体密封结构,采用实验和数值模拟的方法研究了发散型与聚合型阶梯式磁性液体密封的耐压机理,由此推导出发散型与聚合型阶梯式磁性液体密封的耐压理论。采用等效磁路法设计了阶梯式磁性液体密封结构,采用磁场有限元法对阶梯式磁性液体密封结构进行了优化。采用磁场有限元法研究了阶梯式磁性液体密封的泄漏位置,数值模拟了阶梯式磁性液体密封间隙内的磁场分布,得到不同径向和轴向密封间隙下发散型与聚合型阶梯式磁性液体密封的理论耐压能力。实验研究了径向密封间隙高度、轴向密封间隙宽度、磁性液体种类、磁性液体体积量以及转速对发散型与聚合型阶梯式磁性液体密封耐压能力的影响,并与发散型与聚合型阶梯式磁性液体密封的理论耐压值进行了比较和分析。结果表明,发散型与聚合型阶梯式磁性液体密封耐压能力与其理论耐压能力符合的很好；发散型与聚合型阶梯式磁性液体密封耐压能力随着磁性液体饱和磁化强度的增加而增加,随着磁性液体量的增加而增加并趋于稳定,随着转速的增加保持不变。实验研究了非阶梯式磁性液体密封的耐压能力,并将发散型和聚合型阶梯式磁性液体密封耐压能力与非阶梯式磁性液体密封耐压能力实验值进行了比较和分析。结果表明,当轴向密封间隙宽度较小时,阶梯式磁性液体密封性能显著大于非阶梯式磁性液体密封性能,但当轴向密封间隙宽度较大时,阶梯式磁性液体密封相对非阶梯式磁性液体密封的优势变得越小。
[Abstract]:In order to improve the pressure resistance of magnetic liquid seal under the condition of large clearance, a new stepped magnetic liquid seal structure is proposed creatively in this paper. The pressure resistance mechanism of divergent and polymeric stepped magnetic liquid seals is studied by means of experiment and numerical simulation, and the pressure resistance theory of starting and aggregating stepped magnetic liquid seals is derived. The stepped magnetic liquid seal structure is designed by equivalent magnetic circuit method, and the stepped magnetic liquid seal structure is optimized by magnetic field finite element method. The leakage position of stepped magnetic liquid seal is studied by magnetic field finite element method, and the magnetic field distribution in the clearance of stepped magnetic liquid seal is simulated. The theoretical pressure resistance of divergent and aggregated step magnetic fluid seals with different radial and axial sealing clearances is obtained. The effects of the height of radial seal clearance, the width of axial seal clearance, the type of magnetic liquid, the volume of magnetic liquid and the rotating speed on the pressure resistance of divergent and aggregated stepped magnetic liquid seal were studied. The theoretical pressure resistance values of divergent and polymer step magnetic fluid seals are compared and analyzed. The results show that the pressure resistance of divergent and polymeric stepped magnetic liquid seals is in good agreement with their theoretical pressure resistance. The pressure resistance of divergent and polymeric stepped magnetic liquid seals increases with the increase of saturation magnetization of magnetic liquid, increases and tends to be stable with the increase of magnetic liquid content, and remains unchanged with the increase of rotating speed. The pressure resistance of non-stepped magnetic liquid seal is studied experimentally. the pressure resistance of divergent and aggregated stepped magnetic liquid seal is compared and analyzed with the experimental value of non-stepped magnetic liquid seal. The results show that when the clearance width of axial seal is small, the sealing performance of stepped magnetic liquid is significantly higher than that of non-stepped magnetic liquid, but when the width of axial seal clearance is large, The advantage of step magnetic fluid seal is smaller than that of non step magnetic liquid seal.
【学位授予单位】：北京交通大学
【学位级别】：博士
【学位授予年份】：2014
【分类号】：TB42

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