新型高温热油泵非接触式机械密封设计研究

发布时间：2018-03-30 06:00

本文选题：高温热油泵　切入点：机械密封　出处：《中国石油大学》2011年硕士论文

【摘要】：本文主要针对广州石化高温热油泵应用的波纹管单端面接触式机械密封,在实际生产中由于高温及端面摩擦热导致流体膜结焦、密封环端面磨损、老化、热裂等使得密封频繁失效,被密封介质高温、高压、易燃,一旦泄漏很容易起火,既造成物质损失也存在很大的安全问题,因此对普通波纹管接触式机械密封的改造有很重要的意义,能够更好的提高生产效率,节约成本。本文通过对现有的非接触式机械密封理论的深入学习并结合现场实际工况条件以及实际生产中波纹管单端面接触式密封的不足,设计计算出一种“非接触式+接触式”串联的新型机械密封结构来改造原机械密封,并主要计算螺旋槽端面参数,然后通过CFD软件FLUENT对整个密封腔内的流体流场进行数值模拟计算,得到腔内流体的速度矢量分布、压力分布、质点轨迹以及涡量分布等,有力的支持了本次设计的非接触式机械密封结构的可行性。
[Abstract]:This paper mainly aims at the single end contact mechanical seal of corrugated pipe used in high temperature oil pump of Guangzhou Petrochemical Company. In actual production, because of high temperature and friction heat of end surface, fluid film coking, wear and aging of seal ring end face, Hot cracking causes frequent failure of the seal, high temperature, high pressure and flammability of the sealed medium. Once the leakage is very easy to catch fire, there are not only material losses but also great safety problems. Therefore, it is of great significance to improve the production efficiency and save the cost of the conventional bellows contact mechanical seal. Based on the deep study of the existing non-contact mechanical seal theory and the actual working conditions on the spot and the deficiency of the bellows single end contact seal in practical production, this paper studies the existing theory of non-contact mechanical seal. A new type of mechanical seal structure in series "non-contact type" was designed and calculated to transform the original mechanical seal, and the end surface parameters of spiral groove were calculated. Then the fluid flow field in the seal cavity is numerically simulated by CFD software FLUENT, and the velocity vector distribution, pressure distribution, particle trajectory and vorticity distribution of the fluid in the cavity are obtained. It supports the feasibility of the non-contact mechanical seal structure.
【学位授予单位】：中国石油大学
【学位级别】：硕士
【学位授予年份】：2011
【分类号】：TH136

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