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机械密封的发展历程与研究动向 总被引:11,自引:2,他引:11
介绍了机械密封的产生及其发展背景,阐述了机械密封每一阶段发展的主要动力。综述50年来构建机械密封机理的表面张力假说和粘滞力假说。基于表面张力假说,机械密封存在空化、汽化密封理论;基于粘滞力假说,存在边界润滑、混合润滑密封理论。在不断探索机械密封机理的同时,成功地利用密封机理设计制造了机械密封产品。目前先进的机械密封应用技术主要有表面改形技术、组合密封技术和可控机械密封技术。阐明了现有密封理论都存在着无法解决的问题,指出了机械密封的研究动向。提高机械密封端面参数测试的可靠性是研究和揭示机械密封有关规律的关键;可控机械密封实践仍存在不少难点,包括最佳工况点的求取、控制参数的选择与测量、反馈执行机构的研制等;纳米材料的特殊性能有助于改善机械密封端面间润滑状态,开发纳米材料机械密封和应用纳米冲洗液将是机械密封研究的近期目标。 相似文献
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随着机械密封技术不断创新、机械密封使用寿命不断延长,在填料密封已越来越不能满足较高的密封要求的情况下,进行机械密封改造已势在必行。下文简略介绍机械密封改造的方法及步骤,并对改造前后进行优劣分析。 相似文献
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在查阅大量国内外相关资料和技术专利文献的基础上,运用Ansys有限元分析软件对传统型堵漏密封卡具进行了力学性能分析,针对传统型堵漏密封卡具存在的不足,提出了新式四等分带压堵漏密封夹具的设计方案,并进行了相关力学性能分析及设计计算。 相似文献
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Hongmei Zhao Jiatong Chai Xiaoming Lin Wei Wang Jeanne Petko Valerie Woodward 《摩擦学汇刊》2018,61(3):494-502
The automotive market's demands for increased efficiency and improved fuel economy are driving a change to lower viscosity lubricants. However, the move to increased efficiency cannot come at the expense of hardware life and durability. Modern lubricants are being developed to provide efficiency and durability and the additive package is an important part of this design. Laboratory tests that simulate vehicle subsystem operation are an important tool to ensure that lowering the lubricant viscosity does not result in reduced hardware life. This article presents results from dynamic radial lip seal testing of a variety of driveline lubricants. In addition to overall seal failure life parameters such as seal lip and shaft wear, changes in radial load, seal failure analysis, and lubricant rheology and surface tension are discussed. 相似文献
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核主泵用流体静压型机械密封性能的影响因素研究 总被引:8,自引:0,他引:8
以核主泵(Reactor coolant pumps,RCP)用流体静压型机械密封(Hydrostatic mechanical seal,HS-MS)为研究对象,考虑辅助密封圈的影响,采用MSC Marc有限元软件建立完整的动环组件非线性二维轴对称有限元模型,给出合理的动环简化边界约束条件;在此基础上,考虑密封端面间流体薄膜中液体的黏温与黏压效应,建立核主泵用流体静压型机械密封的多场耦合数值模型,采用有限差分法对Reynolds方程、能量方程、热传导方程等控制方程进行耦合求解,利用有限元法计算密封环端面热力变形,综合分析螺钉预紧力和O形圈位置对密封性能的影响。结果表明:合理的密封环约束边界简化模型对分析和设计流体静压型机械密封至关重要;螺钉预紧力和O形圈位置对密封性能影响显著。预紧力增大使开启力增大,泄漏率也变大;O形圈位置靠近外径时密封稳定性下降。 相似文献
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The mechanical seal with metal faces, used to seal the bearings in rock drill bits, plays a critical role in ensuring a long service life of the drill bit. A numerical model of such a seal has been developed for use as a design tool. The axisymmetric model encompasses a mixed lubrication elastohydrodynamic analysis, and predicts such quantities as leakage rate, film thickness distribution, fluid pressure and contact pressure distributions, interface temperature and face deformation. Model results show that the behavior of this seal, unlike that of conventional industrial seals, depends strongly on the ambient pressure, not just on the pressure drop across the seal. 相似文献