大间隙阶梯式磁性液体旋转密封的理论及实验研究
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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。
:To improve the pressure capability of magnetic fluid seal with large gap, a novel stepped magnetic fluid sealing structure was proposed. The pressure mechanisms of the diverging and converging stepped magnetic fluid seal were investigated by the experimental and numerical methods. The theoretical pressure capabilities of the diverging and converging stepped magnetic fluid seal derivation were derived on the basis of their pressure mechanisms.
The stepped magnetic fluid sealing structure was designed and optimized using the equivalent magnetic circuit method and the magnetic field finite element method.
The leak location and magnetic field distribution of the stepped magnetic fluid seal were studied by the magnetic field finite element method. The theoretical pressure capabilities of the diverging and converging stepped magnetic fluid seals were obtained under the different radial and axial sealing gap.
Effects of radial sealing gap height, axial sealing gap width, speed, magnetic fluid type and volume on the pressure capabilities of the diverging and converging stepped magnetic fluid seals were studied experimentally. The experimental and theoretical values of the diverging and converging stepped magnetic fluid seals were compared and analyzed. The results indicate that the theoretical results agreed well with the experimental results. The pressure capabilities of diverging and converging stepped magnetic fluid seals increase with the increase of the magnetization of the magnetic fluid, increase with the increase of the magnetic fluid volume and become stable, remain constant with the increase of the rotational speed.
The pressure capabilities of non stepped magnetic fluid seal were studied experimentally, compared and analyzed with the experimental results of the stepped magnetic fluid seal. The results show that when the axial sealing gap width is small, the pressure capabilities of the stepped magnetic fluid seals are significantly larger than that of the non stepped magnetic fluid seals. However, when the axial sealing gap width is larger, the pressure capability advantages of the stepped magnetic fluid seals are relatively smaller than that of the non stepped magnetic fluid seals.
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。
:To improve the pressure capability of magnetic fluid seal with large gap, a novel stepped magnetic fluid sealing structure was proposed. The pressure mechanisms of the diverging and converging stepped magnetic fluid seal were investigated by the experimental and numerical methods. The theoretical pressure capabilities of the diverging and converging stepped magnetic fluid seal derivation were derived on the basis of their pressure mechanisms.
The stepped magnetic fluid sealing structure was designed and optimized using the equivalent magnetic circuit method and the magnetic field finite element method.
The leak location and magnetic field distribution of the stepped magnetic fluid seal were studied by the magnetic field finite element method. The theoretical pressure capabilities of the diverging and converging stepped magnetic fluid seals were obtained under the different radial and axial sealing gap.
Effects of radial sealing gap height, axial sealing gap width, speed, magnetic fluid type and volume on the pressure capabilities of the diverging and converging stepped magnetic fluid seals were studied experimentally. The experimental and theoretical values of the diverging and converging stepped magnetic fluid seals were compared and analyzed. The results indicate that the theoretical results agreed well with the experimental results. The pressure capabilities of diverging and converging stepped magnetic fluid seals increase with the increase of the magnetization of the magnetic fluid, increase with the increase of the magnetic fluid volume and become stable, remain constant with the increase of the rotational speed.
The pressure capabilities of non stepped magnetic fluid seal were studied experimentally, compared and analyzed with the experimental results of the stepped magnetic fluid seal. The results show that when the axial sealing gap width is small, the pressure capabilities of the stepped magnetic fluid seals are significantly larger than that of the non stepped magnetic fluid seals. However, when the axial sealing gap width is larger, the pressure capability advantages of the stepped magnetic fluid seals are relatively smaller than that of the non stepped magnetic fluid seals.
引文
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