螺栓法兰垫片接头整体结构数值模拟和密封性能分析
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摘要
建立了螺栓法兰垫片接头整体结构有限元模型,研究了法兰盘厚度、螺栓数目、工作压力、及螺栓预紧力等参数对法兰偏转角和泄漏率的影响。结果发现,由于法兰力矩作用,法兰盘发生偏转,使得垫片上压应力沿径向分布不均,在垫片外缘存在最大压应力环带,环带上最小压应力值决定着接头的密封性能。法兰偏转会影响接头泄漏率,但并非偏转越大,泄漏率越大;在某些情况下,泄漏率甚至随偏转角增大而减小。
In this paper, finite element model was established for integral bolted flange and gasket joint. The effects of parameters of flange thickness, bolt number, working pressure and seated bolt force to deflection of flange and its leakage rate were studied. It was found from the results that the deflection of flange due to the torque made the force acting on the surface of gasket nonuniform along radial direction; at the outer edge of gasket there is a ring with the largest compressive stress, however the leakage rate is determined form the smallest compressive stress on gasket; the leakage rate of joint will be influenced by flange deflection, but it is not the fact that the larger flange deflection is, the more serious leak occurs; in some cases, leakage rate may decrease with larger flange deflection.
In this paper, finite element model was established for integral bolted flange and gasket joint. The effects of parameters of flange thickness, bolt number, working pressure and seated bolt force to deflection of flange and its leakage rate were studied. It was found from the results that the deflection of flange due to the torque made the force acting on the surface of gasket nonuniform along radial direction; at the outer edge of gasket there is a ring with the largest compressive stress, however the leakage rate is determined form the smallest compressive stress on gasket; the leakage rate of joint will be influenced by flange deflection, but it is not the fact that the larger flange deflection is, the more serious leak occurs; in some cases, leakage rate may decrease with larger flange deflection.
引文
[1]徐鸿.从ICPVT-9看世界压力容器技术发展现状与趋势(三)-螺栓法兰接头和密封垫片[J].压力容器,2001,18(1):70-75.
[2]林殊娟.低温法兰密封结构的密封性能特性研究[D].杭州:浙江大学,2013.
[3]顾伯勤.螺栓法兰连接系统泄漏率计算[J].石油化工设备,1999,28(3):30-33.
[4]宋兆哲.静密封过程中垫片的密封机理及失效分析[D].昆明:昆明理工大学,2011.
[5]冯秀.金属垫片密封模型及应用研究[D].南京:南京工业大学,2006.
[6]高忠白,黄寿辉,蔡仁良,等.膨胀石墨缠绕垫常温密封性能试验[J].石油化工设备,1985,14(7):24-30.
[7]田菲,张铱鈖.膨胀石墨缠绕垫片常温密封性能分析[J].化工机械,2013,40(6):811-815.
[8]王新敏,李义强,许宏伟.ANSYS结构分析单元与应用[M].北京:人民交通出版社,2011.423.
[9]张柱.考虑垫片非线性特征法兰接头特性研究[D].昆明:昆明理工大学,2007.
[10]刘翔.基于有限元法的设备法兰强度与刚度分析及工程设计软件开发[D].北京:北京化工大学,2016.
[11]ASMEⅧ-1[S].强制性附录2-15,315.
[12]GB 150.3-2011压力容器[S].第3部分:设计:183.
[13]Rossheim D B,Mark A R C.Gasket loading constants[J].Mechanical Engineering,1943(65):647.
[2]林殊娟.低温法兰密封结构的密封性能特性研究[D].杭州:浙江大学,2013.
[3]顾伯勤.螺栓法兰连接系统泄漏率计算[J].石油化工设备,1999,28(3):30-33.
[4]宋兆哲.静密封过程中垫片的密封机理及失效分析[D].昆明:昆明理工大学,2011.
[5]冯秀.金属垫片密封模型及应用研究[D].南京:南京工业大学,2006.
[6]高忠白,黄寿辉,蔡仁良,等.膨胀石墨缠绕垫常温密封性能试验[J].石油化工设备,1985,14(7):24-30.
[7]田菲,张铱鈖.膨胀石墨缠绕垫片常温密封性能分析[J].化工机械,2013,40(6):811-815.
[8]王新敏,李义强,许宏伟.ANSYS结构分析单元与应用[M].北京:人民交通出版社,2011.423.
[9]张柱.考虑垫片非线性特征法兰接头特性研究[D].昆明:昆明理工大学,2007.
[10]刘翔.基于有限元法的设备法兰强度与刚度分析及工程设计软件开发[D].北京:北京化工大学,2016.
[11]ASMEⅧ-1[S].强制性附录2-15,315.
[12]GB 150.3-2011压力容器[S].第3部分:设计:183.
[13]Rossheim D B,Mark A R C.Gasket loading constants[J].Mechanical Engineering,1943(65):647.