A new design for dynamic sealing of flange closure considering bending deformation
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摘要: 端盖法兰的螺栓预紧力选择是密封结构设计的重要问题。本文中通过估算端盖法兰弯曲振动的等效刚度和等效质量，建立了考虑端盖弯曲振动的法兰结构响应双弹簧分析模型，获得了与实验数据一致性较好的结构响应分析结果。总结了端盖轴向振动、弯曲振动引起的密封面位移随预紧力、端盖厚度的变化规律；并发现随预紧力增加，密封面间隙逐渐减小并趋于一个极值；端盖弯曲变形是影响该极值大小的主要因素。Abstract: Preload selection is one of the key problems for sealing design of closure-flange structure. In this study, a dual spring mass model accounting for the bending deformation of the closure is developed by estimating the equivalent stiffness and mass of the closure flexural vibration. The predicting result of dynamic response is in a great agreement with experiments. Finally, the law of variation of both axial and flexural deformation of the closure with bolt preloading is summarized, and the results show tthe clearance of sealing surface decreases gradually to a stable value with the increase of preloading force. And the bending deformation of the end cap is the main factor affecting this stable value.
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Key words:
- dynamic sealing /
- closure flange /
- bolt preload /
- flexural vibration
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图 6 应变历程对比（下方的case1-3为2-spring model的3种工况）
Figure 6. Comparison of strain time history
图 8 预紧力对轴向变形、弯曲变形的影响
Figure 8. Influence of bolt preload on axial deformation and bending deformation
表 1 计算结果与偏差
Table 1. Result and error
模型 等效刚度/(GN·m−1) 等效质量/kg 计算应变/10−6 计算应变偏差/% 1-spring 690 28 2-spring-(A) 6.02 0.53 780 44 2-spring-(B) 12.48 0.68 650 20 2-spring-(C) 19.15 1.08 600 11 
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