共查询到19条相似文献,搜索用时 93 毫秒
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介绍了轨道式球形蝶阀的结构特点、工作原理及其设计。轨道式球形蝶阀的结构独特,密封形式多样,可以实现阀门的无摩擦动作和可靠的密封性能,完全可以替代国外进口同类产品。 相似文献
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三偏心金属密封蝶阀的原理及特性 总被引:3,自引:1,他引:3
论述了偏心抛物线形密封面取代球形密封面的动作原理及结构特性。分析了三偏心金属密封蝶阀的技术特性和使用性能,给出了双偏心密封结构与三偏心密封结构的形线转换方程。 相似文献
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主要论述了楔紧式金属密封蝶阀的结构和工作原理。重点介绍了楔紧式金属密封蝶阀的设计计算,并对高温条件下的设计提出了要求和方法。 相似文献
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介绍了高温三偏心硬密封蝶阀的密封结构及结构弊端,指出了影响当前蝶阀密封结构不能承受反向压力的原因,在此基础上对蝶阀密封结构进行了改进设计.改进后的密封结构保证了正、反向的可靠密封性,解决了以往反向不能密封的问题,经试验验证改进后的蝶阀反向承压密封性能良好. 相似文献
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分析了蝶阀密封结构的进展过程,运用TRIZ技术进化理论对蝶阀密封结构的进化路线进行了系统分析,并探索了未来蝶阀可能的密封结构状态。 相似文献
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Investigation of the mechanical behavior of a flexible solid metal seal for a cryogenic butterfly valve 总被引:1,自引:0,他引:1
Ahn Jun Tae Lee Kyung Chul Lee Kwon Hee Han Seung Ho 《Journal of Mechanical Science and Technology》2011,25(9):2393-2400
Seat tightness at the fully shut position should be a consideration in the development of a butterfly valve for use in a liquefied
natural gas (LNG) vessel. A flexible solid metal seal offers sufficient tightness of the butterfly valve and meets the specifications
for cryogenic temperature. In the present study, characteristics for a cryogenic butterfly valve, such as the flow coefficient
and the pressure loss coefficient, were estimated by numerical fluid analysis carried out to simulate 3-D flow and to study
performance as it was affected by the opening angles of the valve disc. A design criterion to ensure the seat tightness of
the butterfly valve at the fully shut position was proposed, in which the contact pressure between the metal seal and the
valve disc would be compared with the fluid pressure. Numerical structural analysis showed that the contact pressure can be
calculated by simulation of the frictional contact behavior on the surface of the metal seal and the valve disc. As a result,
an adequate flexibility of the metal seal and the valve disc was required in order to accomplish a contact pressure that would
be high enough to satisfy the seat tightness requirement. Under cryogenic temperature, thermal shrinkage caused the metal
seal to adhere closely to the valve disc periphery at both sides and raised the contact pressure to a relatively high value,
though there was no contact across a small area at the center position, which is susceptible to leakage. An additional displacement
of the metal seal and the valve disc appeared at an operating fluid pressure of 6.9 bar and produced sufficient contact pressure
at the no-contact area. This was verified by experimental leakage tests performed at room and cryogenic temperatures. 相似文献
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介绍了水轮机进水蝶阀双密封的用途,分析了检修密封副和工作密封副的结构特点,探讨了该类型阀门在实际工程应用中存在的问题,论述了国外同类产品性能。 相似文献
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介绍了一种结合Solidworks二维作图软件,在避免干涉情况下,快速确定三偏心蝶阀回转中心位置的方法。用该方法同时可求得最小径向偏心量,控制了三偏心蝶阀的启闭力矩而且提高了反向密封性能。在优化的同时大大简化了三偏心蝶阀的设计。 相似文献
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针对金属硬密封蝶阀的双向密封问题,基于液压元件设计中的油缸活塞原理,设计了一种在动水作用下带移动密封不锈钢圈的新型金属硬密封蝶阀。对基本结构进行了分析,确定了采用双偏心结构的设计;对正向承压比压、反向承压比压、金属密封圈的移动距离进行了计算,有效地解决了双偏心金属硬密封蝶阀的反向承压问题;对密封副材料选择进行了分析,有效地保证了密封效果和比压要求。 相似文献
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运用AutoCAD对金属硬密封蝶阀密封挤压过程产生的干涉体进行定性和定量分析.为修正、验证和确定蝶阀的三偏心参数提供设计依据。分析了双偏心球面密封副的优良性能。 相似文献