Labyrinth combined type multi-stage brush type sealing structure

The invention discloses a labyrinth combined type multi-stage brush type sealing structure, and particularly relates to a labyrinth combined type multi-stage brush type sealing structure which is high in reliability and long in service life and meets the requirement of ultrahigh pressure difference sealing by utilizing flexible optimized matching and combination of single-stage brush type sealing and labyrinth sealing in a megapascal ultrahigh pressure difference sealing environment. The sealing device can be widely applied to air systems, rim sealing and bearing cavity sealing of impeller rotating machines such as turbine-based combined cycle engines, rocket-based combined cycle engines, air turbine-rocket combined power engines, aero-engines, gas turbines or steam turbines. 本发明公开了一种迷宫组合式多级刷式密封结构，尤其涉及一种兆帕级超高压差封严环境的利用单级刷式密封和迷宫密封灵活优化搭配组合实现满足超高压差封严需求的高可靠性和高寿命迷宫组合式多级刷式密封结构，可广泛应用于涡轮基组合循环发动机、火箭基组合循环发动机、空气涡轮火箭组合动力发动机、航空发动机、燃气涡轮或汽轮机等叶轮旋转机械的空气系统、轮缘封严以及轴承腔封严。