过盈配合公差对镶嵌式机械密封性能的影响研究
|
摘要
采用有限差分和有限元相结合的方法,通过建立耦合模型,分析镶嵌式流体动压型机械密封的配合公差对密封性能的影响。通过计算表明,选定的四种配合公差对机械密封的密封性能影响较小;配合公差对密封性能的影响与镶嵌结构和材料有关。针对该次计算结果和日常使用所遇到问题,建议在满足安全裕量的情况下,宜选取低级别的配合公差,并确保用于过盈连接的金属与密封环材料具有相同或非常接近的膨胀系数;针对过盈配合连接件内部的残余应力问题,可先对组件进行热处理,经处理后再对密封端面进行研磨。在经过上述处理后,可大大降低镶嵌式机械密封由于过盈而导致的失效风险。
By combination of finite difference and element method, the mathematic model was developed. The effect of the interference fit on mechanical seal performance was analyzed. It is found that the performance has been less affected by the fit tolerance. And the performance was concerned with the structure of interference fit and the material of the mechanical ring. Based on the calculating data and problems in use of the mosaic hydrodynamic mechanical seal, it is suitable to select the low level coordination tolerance and it has adequate safety allowance.The material of the metal and seal ring should maintain the same or close coefficients of expansion. For the problem of the residual stresses of the mosaic structure, the mosaic mechanical seal should undergo heat treatment first. Lap the surface of the mechanical seal ring after heat treatment. By taking these effective measures, the risk of the sealing failure can be significantly reduced.
By combination of finite difference and element method, the mathematic model was developed. The effect of the interference fit on mechanical seal performance was analyzed. It is found that the performance has been less affected by the fit tolerance. And the performance was concerned with the structure of interference fit and the material of the mechanical ring. Based on the calculating data and problems in use of the mosaic hydrodynamic mechanical seal, it is suitable to select the low level coordination tolerance and it has adequate safety allowance.The material of the metal and seal ring should maintain the same or close coefficients of expansion. For the problem of the residual stresses of the mosaic structure, the mosaic mechanical seal should undergo heat treatment first. Lap the surface of the mechanical seal ring after heat treatment. By taking these effective measures, the risk of the sealing failure can be significantly reduced.
引文
[1]顾永泉.机械密封实用技术[M].北京:机械工业出版社,2004.
[2]顾永泉.流体动密封[M].东营:石油大学出版社,1990.
[3]蔡仁良,顾伯勤,宋鹏云.过程装备密封技术(第二版)[M].北京:化学工业出版社,2010.
[4]潘承怡,向敬忠,宋欣.机械零件设计[M].北京:清华大学出版社,2012.
[5]郭东波,刘宪珍.船舶艉轴机械密封镶嵌式动环过盈配合分析[J].船舶工程,2009,38(1):32-35.
[6]李婕.镶装密封环密封特性的研究[D].北京:北京化工大学,2009.
[7] Parsons B, Wilson E A. A Method for Determining the Surface Contact Stresses Resulting from Interference Fits[J]. Journal of Engineering for Industry, 1970,92:208.
[8]刘杰,李鲲,吴兆山,等.镶嵌式直线深槽流体动压型机械密封性能研究[J].流体机械,2013,(12):16-21.
[9]张杰,李鲲,吴兆山,等.核主泵流体静压式二级密封的压力变形数值研究[J].液压气动与密封,2012,(6):56-59.
[10]张杰,李鲲,吴兆山,等.镶装式硬质合金密封环的压力变形研究[J].液压气动与密封,2012,(6),29-33.
[11]刘杰.核主泵用镶嵌式直线深槽流体动压型机械密封性能研究[D].杭州:浙江工业大学,2013.
[2]顾永泉.流体动密封[M].东营:石油大学出版社,1990.
[3]蔡仁良,顾伯勤,宋鹏云.过程装备密封技术(第二版)[M].北京:化学工业出版社,2010.
[4]潘承怡,向敬忠,宋欣.机械零件设计[M].北京:清华大学出版社,2012.
[5]郭东波,刘宪珍.船舶艉轴机械密封镶嵌式动环过盈配合分析[J].船舶工程,2009,38(1):32-35.
[6]李婕.镶装密封环密封特性的研究[D].北京:北京化工大学,2009.
[7] Parsons B, Wilson E A. A Method for Determining the Surface Contact Stresses Resulting from Interference Fits[J]. Journal of Engineering for Industry, 1970,92:208.
[8]刘杰,李鲲,吴兆山,等.镶嵌式直线深槽流体动压型机械密封性能研究[J].流体机械,2013,(12):16-21.
[9]张杰,李鲲,吴兆山,等.核主泵流体静压式二级密封的压力变形数值研究[J].液压气动与密封,2012,(6):56-59.
[10]张杰,李鲲,吴兆山,等.镶装式硬质合金密封环的压力变形研究[J].液压气动与密封,2012,(6),29-33.
[11]刘杰.核主泵用镶嵌式直线深槽流体动压型机械密封性能研究[D].杭州:浙江工业大学,2013.