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.
引文
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