Study On Sealing Performance Of Hydrodynamic Mechanical Seals

With the rapid development of modern industry, the sealing environment of mechanical seals has changed greatly and makes the operation conditions of mechanical seals harsher and more diversified. It is one of the important subjects of current research that the machinery of mechanical seals under high parameters such as high speeds and high pressure. As to some high parameter operating modes in actual production, it is a kind of extremely effective measure to adopt hydrodynamic mechanical seals.Hydrodynamic mechanical seals carve a various kinds of grooves on seal ring, producing a layer of extremely thin fluid film between the end surfaces by hydrodynamic effect to achieve the non-contact condition, to improve the lubricated state between the end surfaces. Compared with the ordinary mechanical seals, hydrodynamic mechanical seals can be more competent with high parameter condition which ordinary mechanical seals cannot burden; meanwhile, they can reduce the wear in sealing surface greatly, raise the sealing reliability and lengthen the seals'life-span. As the advanced technology of mechanical seals today, hydrodynamic mechanical seals have already been extensively applied in process equipments such as centrifugal pump, centrifugal separator, centrifugal compressor and reaction kettle.On the basis of synthesizing a great deal of domestic and international documents, from the angle of computational fluid dynamics, beginning with the whole unreduced fluid dynamics controlling equation, base on the finite volume method, using FLUENT to calculate the fluid field of the Hydrodynamic mechanical seals'fluid film simulate, this literary emphasis on solving the difficulty in dividing the gird which caused by the combination of microscale and macroscale. Using RNG k-εturbulence model and SIMPLE algorithm, this literary calculates characteristic parameters such as the pressure distribution between sealing surfaces, the fluid film stiffness and leakage. Compared the fluid field achieved by simulate calculation and experiment data got from other document, this literary achieves a accurate fluid film pressure field and makes corresponding theory analysis to the seal characteristics. Through optimization design to the hydrodynamic groove, this literary analysis the influence on sealing property when the groove depth-film clearance ratio and the spiral angle and the groove-dam length ratio change.