ISSN   1004-0595

CN  62-1095/O4

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赵艳凤, 彭旭东, 江锦波, 陈源, 赵文静. 均压槽结构形状对静压干气密封性能影响分析[J]. 摩擦学学报, 2017, 37(5): 677-685. DOI: 10.16078/j.tribology.2017.05.016
引用本文: 赵艳凤, 彭旭东, 江锦波, 陈源, 赵文静. 均压槽结构形状对静压干气密封性能影响分析[J]. 摩擦学学报, 2017, 37(5): 677-685. DOI: 10.16078/j.tribology.2017.05.016
ZHAO Yan-feng, PENG Xu-dong, JIANG Jin-bo, CHEN Yuan, ZHAO Wen-jing. Influence of the Pressure-equalizing Groove on the Seal Performance of Hydrostatic Dry Gas Seal[J]. TRIBOLOGY, 2017, 37(5): 677-685. DOI: 10.16078/j.tribology.2017.05.016
Citation: ZHAO Yan-feng, PENG Xu-dong, JIANG Jin-bo, CHEN Yuan, ZHAO Wen-jing. Influence of the Pressure-equalizing Groove on the Seal Performance of Hydrostatic Dry Gas Seal[J]. TRIBOLOGY, 2017, 37(5): 677-685. DOI: 10.16078/j.tribology.2017.05.016

均压槽结构形状对静压干气密封性能影响分析

Influence of the Pressure-equalizing Groove on the Seal Performance of Hydrostatic Dry Gas Seal

  • 摘要: 静压干气密封(DGS)中的均压槽起着均布压力和二次节流的作用,开展了典型形状均压槽静压DGS的性能对比和结构优选. 基于静压气体润滑理论,建立了圆形、椭圆形、扇形和环形等四种典型均压槽静压型DGS的几何模型和数学模型,采用有限差分法求解获得了四种均压槽静压型DGS端面的膜压分布和稳态密封性能参数,分析了径向开槽比和周向开槽比对四种均压槽静压型DGS密封性能的影响规律;以获得较大的密封开启力和气膜刚度为目标,计算得到了均压槽径向开槽比和周向开槽比的优选值范围. 结果表明:当均压槽径向开槽比0.15<Wd<0.45时,环形均压槽静压型DGS可获得较大的开启力和气膜刚度,其他三种均压槽静压型DGS的径向开槽比优选值范围为0.3<Wd<0.45;扇形和椭圆形均压槽静压型DGS具有相似的密封性能,其密封性能仅次于环形均压槽静压型DGS;当均压槽周向开槽比0.6<Lθ<1.0时,扇形均压槽静压型DGS可获得较大的开启力和气膜刚度.

     

    Abstract: The pressure-equalizing groove with throttling effect for the hydrostatic dry gas seal (DGS) has the ability of equalizing the gas film pressure.The performance comparison and structure optimization of the typical groove hydrostatic DGS were studied. Based on the hydrostatic gas lubrication theory, the geometric and mathematical model of the circular, ellipse, fan and annular hydrostatic DGS were established, Reynolds equation of the gas film between sealing face was solved by using the finite difference method (FDM), and the pressure distribution and steady seal performance parameters of four kinds of hydrostatic DGS were obtained. The influence of radial groove ratio and circumferential groove ratio on the performance of four kinds of hydrostatic DGS was analyzed. To achieve greater opening force and gas film stiffness, the optimum range of radial groove ratio and circumferential groove ratio of the pressure equalizing groove was obtained. The result shows that when the radial groove ratio was between 0.15 and 0.45, the annular groove DGS had greater opening force and gas film stiffness, while the optimum radial groove ratio for the rest types of hydrostatic DGS was between 0.30 and 0.45. The fan and the elliptical hydrostatic DGS had comparable working performance and their seal performance is inferior to the annular one. When the circumferential groove ratio was between 0.6 and 1.0, the fan hydrostatic DGS can obtain larger opening force and gas film stiffness.

     

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