天然气电控发动机设计说明书毕业论文.doc -- 7 元

武汉科技大学本科毕业设计I摘要为了解决日益严重的环境污染和能源危机的问题，开发了一种以天然气和柴油为燃料的电控双燃料发动机。它是在电控柴油机的基础上改装而成的，采用柴油引燃天然气的方式来工作。由于只需另外加装一套天然气供给系统，适当改变一下燃料供给策略，对原柴油机不必作什么改动，故改装简单、成本低。但改装后天然气替代率高，发动机排放性明显改善。本设计是在原YC6108电控柴油机的基础上，设计安装一套天然气供给系统，并充分利用原柴油机上的电控系统，通过加装相关传感器，精确控制柴油引燃量和天然气的供给量，来提高原发动机的经济性和排放性。具体来说，一方面分析了电控天然气发动机燃料供给策略，对天然气供给系统进行了整体设计另一方面重点设计了天然气供给系统的一些主要专用装置，如气瓶、瓶口阀、手动关闭阀、充气阀、燃气压力调节器、加温器等，对其它所需部件按国家标准进行了选用同时还根据公交车车架，对天然气供给系统布置与安装进行了分析与设计。关键词柴油机天然气双燃料发动机供气系统武汉科技大学本科毕业设计IIAbstractInordertosolvetheincreasinglyseriousenergycrisisandenvironmentalpollutionproblems,wedevelopaelectronicallycontrolleddualfuelenginenaturalfornaturalgasanddieselfuel.ItisModifiedbyaelectronicallycontrolledengine,andworkbydieselignitingthenaturalgas.Weonlyaddanaturalgassupplysystemonthedieselengine,andgivesomeappropriatechangesinthefuelsupplystrategy,butthedieselenginesemissionssignificantlyimproved.WedevelopthiselectronicallycontrolleddualfuelengineonthebasisoftheYC6108DieselEngine.Wemakefulluseoftheelectroniccontrolsystemonthedieselengineandpreciselycontrolthedieselandnaturalgassupplytoimprovetheengineoftheeconomyandemissions.Ontheonehand,weanalyzefuelsupplystrategy,anddesignthegassupplysystemOntheotherhand,wefocusedonthedesignofthegassupplysystemforsomemajorinstallations,suchasthecylinder,thecylindervalve,fillinggasValves,gaspressureregulator,heatingregulator,etc.Wealsodesignthegassupplysystemlayoutandinstallationunderthebusframe.KeywordsDieselengineNaturalgasDualfueldieselengineGassupplysystem武汉科技大学本科毕业设计III目录1前言......................................................................................................................................12原始设计数据......................................................................................................................22．1柴油机数据.................................................................................................................22．2公交车数据.................................................................................................................33系统整体设计......................................................................................................................43．1控制原理设计..............................................................................................................43．2各部件功用.................................................................................................................43．2．1气瓶................................................................................................................43．2．2压力调节器.....................................................................................................53．2．3气体流量阀.....................................................................................................53．2．4中央控制器.....................................................................................................53．2．5油门位置传感器..............................................................................................53．2．6柴油油量控制器..............................................................................................53．2．7冷却水温度传感器...........................................................................................63．2．8控制面板.........................................................................................................64储气系统设计......................................................................................................................74．1气瓶设计.....................................................................................................................74．1．1材料选择.........................................................................................................74．1．2储气压力确定..................................................................................................74．1．3结构设计.........................................................................................................84．1．4尺寸设计.........................................................................................................84．2手动关闭阀设计..........................................................................................................94．2．1结构设计.........................................................................................................94．2．1阀杆设计.......................................................................................................104．3瓶口阀设计...............................................................................................................134．3．1结构设计.......................................................................................................134．3．2泄放直径校核................................................................................................144．4充气阀设计...............................................................................................................154．5其它部件选用............................................................................................................165供给系统设计....................................................................................................................175．1燃气压力调节器设计.................................................................................................175．1．1结构设计.......................................................................................................175．1．2阀口设计.......................................................................................................185．1．3密封膜片设计................................................................................................205．1．4弹簧设计.......................................................................................................215．3加温器设计...............................................................................................................255．3其它部件选用............................................................................................................266总体布置............................................................................................................................276．1气瓶布置...................................................................................................................276．2气瓶架设计校核........................................................................................................30武汉科技大学本科毕业设计IV7结束语................................................................................................................................32参考文献..................................................................................................................................33致谢..................................................................................................................................34