机械密封的扭转变形计算方法与影响因素

针对机械密封环的典型结构,基于圆环理论,建立了密封环结构受力与变形的分析模型。采用圆环理论解析式和有限元法对密封环扭转变形进行了对比计算,分析了密封环的几何结构形状、几何结构尺寸和辅助密封圈的安放位置等因素对密封环扭转变形的影响规律。结果表明:采用理论解析法替代有限元法的计算方法是可行、有效的;复杂截面密封环的台阶长或宽各小于4 mm时,均可直接忽略台阶对扭转变形的影响;辅助密封圈的安放位置和密封环结构形状对扭转变形量均具有重要影响;密封环尺寸在变化不大的前提下,其对扭转变形影响不大。研究结果完善了高压机械密封的设计理论与方法。

Calculation methods of face torsional deformation and related affecting factors for mechanical seal

The structural investigation model was presented based on the circle theory so as to study the influence of different constructions,sizes and positions of secondary sealing ring on torsion deformation of the typical mechanical seal ring.High pressure mechanical seal design theories and methods were discussed. The results showed that the method of analytical calculation instead of the finite element method was feasible and effective.The step on the complex section of sealing ring could be directly ignored when the step size of length or width was smaller than 4 mm.Different constructions and placements of the secondary sealing ring were important factors affecting torsion deformation of mechanical seal ring.A small variation of ring size would not affect torsional deformation.The design theory and method of high pressure mechanical seal were improved.