均压槽结构形状对静压干气密封性能影响分析

发布时间：2018-05-31 11:08

本文选题：静压干气密封 + 均压槽　；参考：《摩擦学学报》2017年05期

【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0.15Wd0.45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0.3Wd0.45;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0.6Lθ1.0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]:In the static pressure dry gas seal (DGs), the uniform pressure groove plays the role of uniform pressure and secondary throttling. The performance comparison and structure optimization of the typical uniform pressure groove DGS are carried out. Based on the theory of hydrostatic gas lubrication, the geometric and mathematical models of four typical static pressure grooves, such as circular, elliptic, sector and annular, are established. The film pressure distribution and steady state seal performance parameters of four static pressure type DGS seals were obtained by the finite difference method. The influence of radial slotted ratio and circumferential slotted ratio on the static pressure DGS seal performance of four kinds of equal pressure grooves was analyzed. With the aim of obtaining large sealing opening force and film stiffness, the optimal range of radial slotted ratio and circumferential slotted ratio is calculated. The results show that when the ratio of radial grooving to 0.15Wd0.45 is equal pressure slot, the static pressure DGS can obtain large opening force and film stiffness. The optimal radial slotted ratio of the other three types of DGS is 0.3Wd0.45.The static pressure DGS with sector and elliptical grooves has similar sealing performance, and its sealing performance is second only to that of the hydrostatic grooves with annular pressure, and when the circumferential slotted ratio is 0.6L 胃 1.0, The open force and film stiffness can be obtained by static pressure DGS.
【作者单位】：浙江工业大学过程装备及其再制造教育部工程研究中心;
【基金】：国家基金面上项目(51575490);国家基金青年基金(51705458) 国家重点基础研究发展规划项目(973)(2014CB046404) 浙江省自然科学基金重点项目(LZ15E050002);浙江省自然科学基金青年基金(LQ17E050008) 浙江省基金一般项目(LY18E050026)资助~~
【分类号】：TH136

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