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基于气体动压式和静压式密封原理,提出了新型的动静压混合式气体密封(简称混合式密封),介绍了该密封的工作原理.采用有限元法,利用Matlab数值软件,求解了混合式密封及动压式密封和静压式密封端面间气膜的Reynolds方程,得到气膜的压力分布,进而求得了密封的性能参数,如开启力、稳态刚度、泄漏率、摩擦功耗等.比较了不同端面结构的混合式密封与静压式和动压式密封的密封性能,并分析了混合式密封及静压式密封在失去气源情况下的密封性能.结果表明:与动压式密封相比,在同一气膜厚度下混合式密封获得的开启力更大,气膜厚度增加时仍具有较大的刚度;混合式密封可实现静压开启,动压运转;由于同时具有动压效应和静压效应,混合式密封工程应用范围更广;此外,混合式密封的特性参数可以通过在线调节阻封气压来改变.
Based on the principles of pneumatic and hydrostatic sealing, a new type of hybrid gas seal (referred to as hybrid seal) is presented, and the working principle of the seal is introduced.Using finite element method and Matlab numerical software, the hybrid And the Reynolds equation of the gas film between the hydrostatic seal and the hydrostatic seal face, the pressure distribution of the gas film is obtained, and then the performance parameters of the seal, such as the opening force, steady-state stiffness, leakage rate, frictional power consumption and so on The performance of hybrid seal, hydrostatic seal and dynamic pressure seal with different end structures are compared, and the sealing performance of mixed seal and static seal with loss of gas source is analyzed.The results show that with the dynamic pressure Compared with the seal type, the opening force obtained by the hybrid seal at the same film thickness is larger, and the stiffness still increases with the increase of the film thickness. The hybrid seal can realize static pressure opening and dynamic pressure operation. Pressure effect and static pressure effect, hybrid sealing engineering application of a wider range; In addition, the characteristics of hybrid seal parameters can be adjusted by blocking pressure on the line to change.