天然气汽车供气系统减压装置设计摘要天然气汽车减压装置是天然气的汽车的一个重要部件，它的质量好坏车的性能有很大的关系，它在天然气汽车中主要起减压和稳压的作用。因此，通过利用减压装置，可以把2-20MPa的压缩天然气压力降到1-2.5kPa进入混合器，以便与空气混合进入汽缸，由于高压气瓶中的CNG气体压力随着燃料充装和使用不断变化，要保持较稳定的空燃比控制，还要求无论瓶内压力如何变化，减压调节器也应保证进入混合器的燃气压力基本恒定，以此实现比较稳定的燃气与空气混合比控制。从而实现减压和稳压的作用。本次毕业设计在原有减压产品的基础上，对其结构布局及形状进行了修改，并对输入发动机过程中的天然气压力的变化值进行了精确的设计，主要是对一级减压阀的缝隙减压和二级减压阀的缝隙减压，以及三级减压阀利用真空度进行减压进行计算，使其能够满足减压至预期的要求。而且对各主要受载荷的零部件进行了强度校核，使选择的材料满足强度要求。预计本次设计出来的减压装置具有结构简单，外行美观，精度高的特点，可提高同类产品的质量，可以满足广大用户的需求。关键词：天然气汽车；减压装置；减压阀I西南石油大学本科毕业设计ABSTRACTThenaturalgasautomobiledecompressorisanaturalgasautomobileimportantpart,itsqualityqualityvehicleperformancehastheverybigrelations,itismainthereducedpressureinthenaturalgasautomobileandtheconstantvoltagefunction.Therefore,throughusedecompressor,may1-20MPacompressionnaturalgaspressuredropto1-2.5kPaentersthemixer,inordertoentersthecylinderwiththeairmix,becauseinthehigh-pressurebottleCNGgaspressurechanges,mustmaintainthestableair-fuelratiocontrol,alsorequestsregardlessofhowthebottleinternalpressuredoeschange,thereducedpressureregulatoralsoshouldguaranteeentersthemixerbasicallythefuelgaspressureconstant,bythisrealizationquitestablefuelgasandairmixtureratiocontrol.Thusrealizationreducedpressureandconstantvoltagefunction.Thisgraduationprojectinoriginalreducedpressureproductfoundation,havecarriedontherevisiontoitsstructuralconfigurationandtheshape,andtoinputintheengineprocessthenaturalgaspressurechangevaluetocarryontheprecisedesign,mainlyistothelevelpressurereliefvalveslitreducedpressureandtwolevelofpressurereliefvalveslitreducedpressure,aswellasthreelevelsofpressurereliefvalvescarryonthereducedpressureusingthevacuumdegreetocarryonthecomputation,enablesitstosatisfythereducedpressuretotheanticipatedrequest.Moreovertoeachmainlyhasbeencarriedontheloadspareparttheintensityexamination,causesthechoicethematerialtosatisfytheintensityrequest.Estimatedthistimedesignsthedecompressorhasthestructuresimply,thelaymanisartistic,precisionhighcharacteristic,mayenhancethesimilarproductthequality,Maysatisfytheusercommunitythedemand.Keywords:Naturalgasautomobile;decompressor;pressurereliefvalveII西南石油大学本科毕业设计目录摘要.................................................................ІABSTRACT..........................................................П绪论.................................................................10.1天然气汽车减压装置的用途和功能.............................10.2天然气汽车减压装置在我国的发展概况.........................10.3天然气汽车减压装置设计的目的和意义.........................11设计任务书.........................................................31.1设计题目....................................................31.2题目说明....................................................31.2.1设计参数规范.........................................31.2.2符合标准.............................................31.2.3设计思路.........
