基于气体隔离的新型水压柱塞副特性分析
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摘要
柱塞式流体泵因具有工作压力高的优点,广泛应用在流体输送、压力清洗和动力传递等领域。对用于流体输送的柱塞泵而言,流体介质中的杂质会加剧柱塞副的磨损和密封失效,大大降低泵的工作寿命。提出一种利用气体隔离的新型柱塞副密封形式,通过压力气膜分隔液体介质和密封圈,防止杂质(腐蚀性液体)进入摩擦副,提高柱塞副寿命的同时避免液体介质外泄。利用FLUENT软件仿真计算了新密封技术的密封流场参数,分析了在加压排液和降压吸液两个过程中的流场特性,初步验证了密封原理的可行性。
The plunger type fluid pump has the advantage of high work pressure,it is widely used in the field of fluid transportation,pressure cleaning and power transmission. However,for the piston pump that used in fluid transfer,the impurities in fluid medium will aggravate the plunger pair wear and seal failure,and greatly reduces the working life of the pump. A plunger sealing form based on gas isolation was proposed. The liquid medium and sealing ring were separated by a pressurized gas film,in order to prevent the impurities( corrosive liquids) from entering the friction. By using the gas isolation,not only the life of piston pair was improved,but also leakage of liquid medium was avoided. FLUENT software was used to calculate the seal flow field parameters of new sealing technology. The flow field performance of the two processes that the liquid was discharged and absorbed by increasing the pressure and reducing the pressure was analyzed. The sealing principle was validated to be feasible.
The plunger type fluid pump has the advantage of high work pressure,it is widely used in the field of fluid transportation,pressure cleaning and power transmission. However,for the piston pump that used in fluid transfer,the impurities in fluid medium will aggravate the plunger pair wear and seal failure,and greatly reduces the working life of the pump. A plunger sealing form based on gas isolation was proposed. The liquid medium and sealing ring were separated by a pressurized gas film,in order to prevent the impurities( corrosive liquids) from entering the friction. By using the gas isolation,not only the life of piston pair was improved,but also leakage of liquid medium was avoided. FLUENT software was used to calculate the seal flow field parameters of new sealing technology. The flow field performance of the two processes that the liquid was discharged and absorbed by increasing the pressure and reducing the pressure was analyzed. The sealing principle was validated to be feasible.
引文
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[3]扈中平,李双喜,蔡纪宁,等.自加压式动静压混合式气体润滑密封的性能分析[J].润滑与密封,2011,36(4):48-52.HU Z P,LI S X,CAI J N,et al. Study on Self Pressurized Hydrostatic dynamic Hybrid Lubrication Gas Seal[J].Lubrication Engineering,2011,36(4):48-52.
[4]马纲,栗秀花,沈心敏,等.柱面气膜密封界面结构与性能分析[J].航空动力学报,2011,26(11):2610-2616.MA G,LI X H,SHEN X M,et al. Analysis of Performance and Interface Structure of Cylinder Gas Film Seal[J].Journal of Aerospace Power,2011,26(11):2610-2616.
[5]王东.海水液压泵配流副关键技术的计算机仿真研究[J].武汉纺织大学学报,2002,15(3):53-57.WANG D.Computer Simulation Investigation into Key Problem of Distribution in Seawater Hydraulic Pump[J].Journal of Wuhan Textile University,2002,15(3):53-57.
[6]郝鑫,王建中,施家栋,等.活塞式高低压发射系统的膛内流场仿真分析与实验[J].北京理工大学学报,2013,33(10):1005-1009.HAO X,WANG J Z,SHI J D,et al.Simulation and Experiment of Interior Flow Field in Piston High-low Pressure Launcher[J]. Journal of Beijing Institute of Technology,2013,33(10):1005-1009.
[7]吴生,黄翔,李成成,等.高压喷气+直接蒸发冷却在工业厂房的应用[J].流体机械,2012,40(5):76-79.WU S,HUANG X,LI C C,et al. Preliminary of Ventilation and Cooling of High Pressure Jet and Evaporative on Industry Building[J].Fluid Machinery,2012,40(5):76-79.
[8]邱冠豪,吴超,黄山果.矿井压气等熵膨胀与节流膨胀降温效果对比研究[J].中国安全生产科学技术,2014,10(4):59-64.QIU G H,WU C,HUANG S G.Comparison Study on Cooling Effect of Compressed Air Isentropic Expansion and Throttling Expansion in Mine[J]. Journal of Safety Science and Technology,2014,10(4):59-64.
[9] HE W,MA C F,MA G Y,et al. Performance Study on Three-stage Power System of Compressed Air Vehicle Based on Single-screw Expander[J]. Science China Technological Sciences,2010,53(8):2299-2303.
[10]隋洪涛.精通CFD动网格工程仿真与案例实战[M].北京:人民邮电出版社,2013.
[11]庞天海.实际气体状态方程[J].化学通报,1965(12):54-59.
[12]李仁年,高宏,权辉,等.固相体积分数对螺旋离心泵内流场的影响[J].甘肃科学学报,2014,26(2):54-57.LI R N,GAO H,QUAN H,et al.Influence of Solid Volume Fraction on Inner Flow Field of a Screw Centrifugal Pump[J].Journal of Gansu Sciences,2014,26(2):54-57.
[13]宋远红.干气密封气膜流场数值分析[J].成都大学学报(自然科学版),2014,33(2):170-173.SONG Y H.Numerical Analysis of Gas Film Flow Field in Dry Gas Seals[J].Journal of Chengdu University(Natural Science Edition),2014,33(2):170-173.