The Finite Element Analysis Of Bellows Used In Metal Bellows Mechanical Seals

On the basis of consulting of plenty of literatures about metal bellows, extrusion formed metal bellows used in bellows mechanical seal was studied by FEA software. The structure of extrusion formed metal bellows has been studied and reasonable values of some parameters were determined. Furthermore the relations which can be used as guidance to design and application of extrusion formed metal bellows between leakage rate, friction factor and elasticity of bellows have been developed.By the simulations of bellows, the axial stiffness of extrusion formed metal bellows was achieved. The influence to the axial stiffness of the structure of bellows, such as the depth, the thickness etc., was analyzed. Compare the results of experiment to those of FE calculate, and empirical formula, the results were approximately equal for single deck bellows. But for double deck bellows, the results were different in value. That is because of the structure error and the structural predigestion when calculated the axial stiffness by FEA model. The equivalent stress was studied, including of the magnitude and the distribution. The value of longitude stress and latitude stress of extrusion formed metal bellows under different pressure was analyzed. The influence to stress distribution of different thickness , depths and the diameters to bellows is discussed. Provide the theoretical basis for project design and invalidation analysis.In order to do with the problem occurred in applications of extrusion formed metal bellow mechanical seals, many factors, such as the effect of bellow elasticity on the performance of mechanical seals, torsion moment etc., have been studied in this paper. One way about optimum compress displacement was achieved.