机械密封与磁性液体组合密封流体动压效应的研究

Modeling ad Hydrodynamic Simulation of Magnetic Fluid Seal Combined with Mechanical Seal

为提升机械密封与磁性液体组合密封的密封性能、减少泄漏量,建立了密封环与密封间隙内液膜的流固耦合模型。采用数值迭代方法进行了流固耦合场的数值分析计算,研究求解组合密封中密封环端面机械变形的解析方法,并通过ANSYS有限元法验证该解析法的适用范围。进一步研究了流固耦合模型对组合密封性能的影响。由于在密封环端面开设直线型槽的作用,密封环端面形成了一定的周向波度和径向锥度。而密封泄漏率随锥角的增大近似呈线性比例增大,泄漏率受锥角的影响较大。密封介质压力升高时,密封环端面周向波度随之增大而径向锥度没有明显变化,这是由于在密封环端面沿周向设有直线型槽作用,减少了锥度增加的幅度,从而减少了密封环端面间的泄漏量。

The fluid hydrodynamic behavior, at the interface of the magnetic fluid and O-ring seal in the com- bination of magnetic fluid seal and mechanical seal, were empirically approximated, mathematically formulated with the fluid-solid coupling model, analytically calculated in the theory of elastic fluid dynamic lubrication, and numeri- cally simulated in finite element method with waviness and pressure, formed above the deep ANSYS software. The influence of the radial taper, circumferential straight slot at the sealing end, on the leakage rate was investigated The simulated results show that the leakage rate strongly depends on the radial taper but weakly on the circumferen- tial waviness. To be specific, as the radial taper increases, the leakage rate linearly increases. Though markedly in- creasing with an increase of the pressure, the circumferential waviness has a minor impact on the radial taper and the leakage rate.