共查询到19条相似文献,搜索用时 140 毫秒
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将泄漏介质视为不可压缩流体,对其进行力学分析,得出了泄漏介质的流量和压力降等表达式。根据泄漏介质的密封条件,分析了软填料密封行为的两个典型状态,给出了软填料可靠密封的静态准则和动态准则。 相似文献
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本文提出“密封工程”的观点,“密封工程”包括涉及密封概念的政策,法规,标准,技术,管理,教育和培训等内容。阐述了树立“密封工程”观点的目和意义,指出树立密封工程观点,有利于增强环境保护意识,推动密封技术进步 。 相似文献
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本文详细地论述了焊接密封的机理、结构及使用范围,对材料的选用及组焊方法作了具体介绍。还就焊接密封使用中出现的问题及消除方法作了阐述。 相似文献
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软填料密封存在的问题与改进 总被引:1,自引:0,他引:1
针对传统软填料密封的基本结构及密封原理。分析了软填料密封存在的问题,提出了从提高密封填料性能和改进密封结构来改善密封效果和提高使用寿命的几种措施。 相似文献
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设计了一种离心式无损密封结构。利用密封介质进入密封间隙随回转轴上的密封盖和甩油环高速转动时产生离心力大于其重力的特性,实现对机械回转式传动结构相对运动部位的密封,解决了用密封圈等常规密封方法易磨损和渗漏油难题。 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
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针对离心式水泵填料密封存在的不足之处,通过对螺旋-填料组合密封的原理及方案分析,改进了离心泵的密封结构。取得了良好的密封效果及经济效益。 相似文献
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水轮机主轴密封的改进 总被引:2,自引:0,他引:2
针对水轮机主轴密封采用传统的盘根密封存在的不足之处,通过对反螺旋式密封、离心式密封原理、结构特点分析,确定了水轮机主轴最佳密封方式为离心式密封。 相似文献
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螺旋密封气吞及密封失效机理分析 总被引:5,自引:2,他引:3
本从泵的角度对螺旋密封“气吞”及“密封失效”现象作出了合理,全面的解释,并提出一种新型组合螺旋密封,分析结果表明,转速较高时,迷宫螺旋密封优于组合螺旋密封,优于单一结构螺旋密封,具有一定的工程使用价值。 相似文献
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Operation of a non-contact compliant gas foil seal (CFS) in a high temperature hybrid dynamic simulator representative of a small gas turbine engine spool is discussed. At the hot section of the simulator two oil-free components, a CFS and a compliant foil bearing (CFB) were mounted and at the cold (compressor) section of the simulator, an oil-mist lubricated ball bearing was installed. The preliminary numerical study on the fluid flow and thermal analysis of a CFS was discussed in the previous work by the authors. The experimental results for successful operation of the foil bearing and foil seal at temperatures up to 560 °C and speeds up to 55,000 rpm are presented. The surface of the CFS and CFB journals for high temperature tests were coated with PS304 solid lubricant film, developed by NASA The CFS performance at different operating speeds and temperatures and differential pressures was investigated. In a similar test, a leakage flow comparison was made among a labyrinth seal, a brush seal and a CFS. The experimental results indicate superior performance of the CFS over the two other types of seals. Unlike brush seal, CFS showed no evidence of rub or induced wear on the journal or seal surface. 相似文献