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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表 1 圆孔直径与出口流量对应关系
孔直径/mm 出口流量/(kg·s-1) 2 0.235 4 0.925 6 1.415 -
[1] 李京泽, 王金刚.双列螺旋槽机械密封效果对比研究[J].南京理工大学学报, 2016, 40(3):343-347 http://d.old.wanfangdata.com.cn/Periodical/njlgdxxb201603016Li J Z, Wang J G. Contrast research of mechanical seal of double spiral groove[J]. Journal of Nanjing University of Science and Technology, 2016, 40(3):343-347(in Chinese) http://d.old.wanfangdata.com.cn/Periodical/njlgdxxb201603016 [2] 戚举鹏, 金惠良, 叶骞.基于温湿度模型的促动器防积水机理与实验[J].大连理工大学学报, 2016, 56(5):474-480 http://d.old.wanfangdata.com.cn/Periodical/dllgdxxb201605006Qi J P, Jin H L, Ye Q. Experiment and waterproof mechanism of actuator based on temperature and humidity model[J]. Journal of Dalian University of Technology, 2016, 56(5):474-480(in Chinese) http://d.old.wanfangdata.com.cn/Periodical/dllgdxxb201605006 [3] 李军, 杨庆俊, 王祖温.气动系统内部结露机理及试验[J].机械工程学报, 2007, 43(9):7-11 doi: 10.3321/j.issn:0577-6686.2007.09.003Li J, Yang Q J, Wang Z W. Mechanism and experiment of the internal condensation of water vapor in pneumatic system[J]. Chinese Journal of Mechanical Engineering, 2007, 43(9):7-11(in Chinese) doi: 10.3321/j.issn:0577-6686.2007.09.003 [4] 白秀茹.防水透气阀在密封结构中的应用[J].无线电工程, 2017, 47(1):76-78, 82 doi: 10.3969/j.issn.1003-3106.2017.01.18Bai X R. Application of waterproof ventilated valve in sealed structure[J]. Radio Engineering, 2017, 47(1):76-78, 82(in Chinese) doi: 10.3969/j.issn.1003-3106.2017.01.18 [5] 徐红.海用露天电子设备防凝露设计概述[J].电子机械工程, 2004, 20(3):24-26 doi: 10.3969/j.issn.1008-5300.2004.03.006Xu H. Summary of the congealing dew resistance design for electronic equipment in the marine open air environment[J]. Electro-Mechanical Engineering, 2004, 20(3):24-26(in Chinese) doi: 10.3969/j.issn.1008-5300.2004.03.006 [6] 樊友军, 陈刚, 仙锦.防水透气阀在雷达密封腔体中的应用[J].电子机械工程, 2012, 28(2):12-14 doi: 10.3969/j.issn.1008-5300.2012.02.004Fan Y J, Chen G, Xian J. Application of waterproof ventilated valve in sealed box of radar[J]. Electro-Mechanical Engineering, 2012, 28(2):12-14(in Chinese) doi: 10.3969/j.issn.1008-5300.2012.02.004 [7] 高素欣, 罗玉淋, 言艳毛.电机控制器用防水透气阀的计算及选型方法[J].客车技术与研究, 2016, 38(6):36-38 http://d.old.wanfangdata.com.cn/Periodical/kcjsyyj201606011Gao S X, Luo Y L, Yan Y M. Calculation and selection methods of waterproof ventilated valve used in motor controller[J]. Bus & Coach Technology and Research, 2016, 38(6):36-38(in Chinese) http://d.old.wanfangdata.com.cn/Periodical/kcjsyyj201606011 [8] 朱琳.防水透气阀在LED路灯设计中的应用[J].湖南农机, 2013, 40(1):59-60 http://d.old.wanfangdata.com.cn/Periodical/hunnj201301031Zhu L. The application of waterproof ventilated valve in the design of LED street lights[J]. Hunan Agricultural Machinery, 2013, 40(1):59-60(in Chinese) http://d.old.wanfangdata.com.cn/Periodical/hunnj201301031 [9] 朱蕴璞, 王芳.一种发动机汽缸密封性能的测试方法[J].南京理工大学学报, 1999, 23(4):321-323 doi: 10.3969/j.issn.1005-9830.1999.04.009Zhu Y P, Wang F. A testing method on the sealing properties of engine cylinder[J]. Journal of Nanjing University of Science and Technology, 1999, 23(4):321-323(in Chinese) doi: 10.3969/j.issn.1005-9830.1999.04.009 [10] 汤赫男, 乔赫廷, 王世杰, 等.迷宫密封结构多参数耦合优化方法[J].润滑与密封, 2018, 43(10):58-62 doi: 10.3969/j.issn.0254-0150.2018.10.011Tang H N, Qiao H T, Wang S J, et al. Multiparameter coupling optimization methods on labyrinth seal structure[J]. Lubrication Engineering, 2018, 43(10):58-62(in Chinese) doi: 10.3969/j.issn.0254-0150.2018.10.011 [11] Rhode D L, Adams R G. Rub-groove width and depth effects on flow predictions for straight-through labyrinth seal[J]. Journal of Tribology, 2004, 126(4):781-787 doi: 10.1115/1.1760555 [12] 卢朝阳, 赵新灿, 高志国.基于动力学模型的流体交互仿真算法[J].南京理工大学学报(自然科学版), 2010, 34(6):753-758 doi: 10.3969/j.issn.1005-9830.2010.06.008Lu C Y, Zhao X C, Gao Z G. Fluid interaction simulation algorithm based on dynamics model[J]. Journal of Nanjing University of Science and Technology (Natural Science), 2010, 34(6):753-758(in Chinese) doi: 10.3969/j.issn.1005-9830.2010.06.008 [13] 徐浩然, 杨华, 刘超, 等.不同湍流模型对MEXICO风力机气动性能预测精度的研究[J].中国电机工程学报, 2013, 33(35):95-101 http://d.old.wanfangdata.com.cn/Periodical/zgdjgcxb201335014Xu H R, Yang H, Liu C, et al. Research on the effect of different turbulence models on the aerodynamic performance prediction accuracy of MEXICO Wind Turbines[J]. Proceedings of the CSEE, 2013, 33(35):95-101(in Chinese) http://d.old.wanfangdata.com.cn/Periodical/zgdjgcxb201335014 [14] 柴明明, 李磊, 陆晓霞, 等.封闭容器内液体间界面不稳定对混合过程的影响[J].南京理工大学学报, 2016, 40(5):554-559 http://d.old.wanfangdata.com.cn/Periodical/njlgdxxb201605009Chai M M, Li L, Lu X X, et al. Influence of interface instability on liquid mixing process in closed container[J]. Journal of Nanjing University of Science and Technology, 2016, 40(5):554-559(in Chinese) http://d.old.wanfangdata.com.cn/Periodical/njlgdxxb201605009