Structural Design and Simulation Analysis of Waterproof Ventilated Valve for Shell of Closed Space
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摘要: 对比膜式防水透气阀与机械式防水透气阀的优缺点，在机械密封理论的基础上对防水透气阀门两个阶段的阻水性和透气性进行阶梯式、曲折式设计，并建立了三维几何模型；利用Ansys仿真软件，分别对2 mm、4 mm、6 mm透气孔径的透气阀进行了流场分析与强度分析。结果表明，该设计能够消耗气体能量、平衡壳体内外压差、阻水排水，并且6 mm孔径的防水透气阀透气性最佳，其不仅可以提升阀门的工作效率，还能满足阀门在工作中的力学性能要求。该迷宫式防水透气阀能够有效地提高电子元件的使用寿命。Abstract: The pros and cons of the membrane type waterproof breathable valve and the mechanical waterproof breathable valve have been compared, and then, based on the mechanical seal theory, the water resistance and gas permeability of the valve have been designed using stepped and zigzag patterns, thereby establishing a waterproof breathable valve entity. A three-dimensional Ansys simulation model was developed to analyze the fluid field and structural strength for the valves with diameters of 2mm, 4mm and 6mm. The results show that the design is effective in consuming gas energy, balancing the pressure difference between the inside and outside of the shell, and in water blocking and draining. Furthermore, the valve with a diameter of 6 mm has the best permeability for gas, which not only can improve the working efficiency of the valve, but also meet the requirements of mechanical performance. The labyrinth waterproof venting valve can effectively improve the service life of electronic components.
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