焊接金属波纹管结构参数对平衡直径的影响

Influence of the Structure Parameters of Welded Metal Bellows on the Balance Diameter

焊接金属波纹管密封性能受自身平衡直径的影响,而平衡直径与波纹管结构参数有关。为了了解焊接金属波纹管各结构参数对平衡直径的影响规律与影响程度,方便评估密封安全性,建立焊接金属波纹管数学模型和三维模型;根据数学模型,得出理想状态下焊接金属波纹管平衡直径表达式;在ANSYS workbench中改变波形、波厚、波数和波距,得出相应参数下的平衡直径数值,并分析不同参数对平衡直径的影响。分析结果表明:其他参数不变时,内外压作用下不同波形焊接金属波纹管的平衡直径随压力先快速增大,后增加趋势逐渐减小;受内压工况下平衡直径随波厚的增大而减小,随波数的增大而增大,随波距的增大而减少,受外压工况下平衡直径随波厚的增大而减小,随波数的增大而增大,随波距的增大而增大;受内压工况下各结构参数对平衡直径影响程度由大到小依次为波厚、波距、波数和波形,受外压工况下各结构参数对平衡直径的影响程度由大到小依次为波厚、波形、波距和波数。

The sealing performance of welded metal bellows is affected by its balance diameter,while the balance diameter is related to the structural parameters of the bellows.In order to study the influence law and influence degree of each structural parameter on the balance diameter and evaluate the seal safety conveniently,the mathematical model and three-dimensional model of the welded metal bellows was established.According to the mathematical model,the balance diameter expression of the welded metal bellows under ideal conditions was obtained.By changing form of convolution,thickness of convolution,number of convolution and pitch of convolution in the ANSYS workbench,the balance diameter values under the corresponding parameters were obtained,and the influence of different parameters on the balance diameter was analyzed.The analysis results show that when other parameters remain unchanged,the equilibrium diameter of welded metal bellows with different form of convolution under the action of internal and external pressures is increased rapidly first with the increase of pressure,and then the increasing trend is gradually decreased.Under the action of internal pressure condition,the balance diameter of the bellows is decreased with the increase of the thickness of convolution,increased with the increase of the number of convolution,and decreased with the increase of the pitch of convolution.Under the external pressure condition,the balance diameter is decreased with the increase of the thickness of convolution,increased with the increase of the number of convolution,and increased with the increase of the pitch of convolution.Under the external pressure condition,the influence degree of each structural parameter on the balance diameter of the bellows is in the order of the thickness of convolution,the pitch of convolution,the number of convolution and the form of convolution.Under the external pressure condition,the influence degree of each structural parameter on the balance diameter of the bellows is in the order of the thickness of convolution,the form of convolution,the pitch of convolution and the number of convolution.