基于单片机控制的自动给水系统外文文献Word格式文档下载.docx
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YANCHINGINSTITUTEOFTECHNOLOGY
外文文献原稿和译文
学院:
机电工程学院
专业:
机械工程
学号:
8
姓名:
张磊
指导教师:
王续明
2017年3月
原稿
Thewatersupplysystemisthenationalproductionandlifeindispensableimportantoneannulus.Thetraditionalmethodofwatersupplyarea,waterpollution,infrastructureinvestment,butthemaindrawbackisthatwatercannotbekeptconstant,causingpartoftheequipmentcannotworknormally.VariablefrequencyspeedcontroltechnologyisanewmatureACmotorsteplessspeedregulatingtechnology,itsuniqueexcellentcontrolperformanceiswidelyappliedtothespeedcontrolfield,especiallyinwatersupplyindustry.Duetothesafetyinproductionandthewaterqualityofspecialneeds,forconstantpressurewatersupplywiththestringentrequirements,sothefrequencycontroltechnologyhasbeenmorein-depthapplication.Constantpressurewatersupplywaystoadvancedtechnology,constantpressure,convenientoperation,reliableoperation,energysaving,highdegreeofautomation,inpumpstationwatersupplycanperformthefollowingfunctions:
(1)tomaintainconstantpressure;
(2)thecontrolsystemcanbemanualorautomaticoperation;
(3)apluralityofpumpautomaticswitchoperation;
(4)systemofsleepandwake,whenpeoplestopwhenwater,thesystemisinasleepstate,untilthewaterdemandautomaticallywake;
(5)adjuststhePIDparametersonline;
(6)pumpunitandcircuitprotectiondetectionalarm,signaldisplay.
Theactualpressureofthepipenetworkfeedbackandagivenpressurewerecompared,whenthepressureofapipenetworkislow,increasetheoutputoffrequencyconverter,pumpspeedfaster,watersupplyquantityincreases,forcingthepipenetworkpressurerise.Vicepumpspeedslowdown,reducethewatersupplypipenetworkpressuredrop,,tokeeptheconstantpressurewatersupply.
Systemhardwarestructure
Systemusesapressuresensor,PLCandinverterasacentralcontroldevice,toachieveadesiredfunction.Source:
networktransmissionanddistributionequipmentinstallationinpipelinepressuresensor,fordetectingthewaterpressureofthepipenetwork,convertingpressureis4~20mAcurrentorvoltagesignalis0~10V,suppliedtotheinverter.
Converterpumpmotorcontroldevice,inaccordancewiththeconstantwaterpressureneedstobe0~50Hzfrequencysignalsupplypumpmotor,adjustitsspeedSAJconverterispowerful,.pre-programmedsetparameterset,willusetherequiredintheprocessofsettingthenumberofparametersisreducedtoaminimum,defaultvalueaccordingtotheapplicationparameterofthemacrochoiceanddifferent.ThesystemadoptsthePIDcontrolapplicationmacro,closedloopcontrol.Inverterbasedonaconstantpressurecorrespondingtothevoltagesettingvalueandfromthepressuresensortoobtainthefeedbackcurrentsignal,theuseofPIDcontrolmacroautomaticallyadjust,changethefrequencyoutputvaluetoadjustthecontrolthespeedofthepumpmotor,toensurethatthepipenetworkpressureconstantrequirements.
Theapplicationofinverterintheconstantpressurewatersupply
characteristicandanalysisofvariablefrequencyspeedregulation
Thewaterusersingeneralisdynamic,sothewatersupplyisinsufficientorexcesswatersupplysituationhasoccurred.Thewatersupplyandtheimbalancebetweentheconcentratedreflectioninwatersupplypressure,namelywaterandwatersupplyisless,thelowpressure;
lesswaterconsumptionandwatersupply,thepressure.Keepthewaterpressureconstant,canmakethewatersupplyandwaterbalancebetweenwatersupplyandwaterforalongtime,thatis,lesswaterwhenthewaterisless,soastoimprovethequalityofwatersupply.
Constantpressurewatersupplysystemfortheuserisveryimportant.Inproductionandlivingwater,ifwatersupplyduetoinsufficientpressureorshortofwater,mayaffectthequalityoflife,seriouswhencaninfluencethesurvivalsafety,suchaswhenafireoccurs,ifthewaterpressureisinsufficientorwatersupply,canquicklyfire,maycausesignificanteconomiclossesandcasualties.Therefore,waterareabymeansofArtsistheconstantpressurewatersupplysystem,canproducegreateconomicbenefitandsocialbenefit.
Withthedevelopmentofelectricpowertechnology,frequencyconversiontechnologyperfected,withvariablefrequencyspeedcontrolasthecoreoftheintelligentwatercontrolsystemreplacedtheprevioushighlevelwatertankandapressuretankandwatersupplyequipment,stablestarting,thestartingcurrentcanbelimitedwithinspecifiedcurrent,therebyavoidingthestartingtimeoftheimpactofpowergrid;
becausetheaveragerotationalspeedofpumpisreduced,whichcanextendthepumpsandvalvesandotherthingsoflife;
toeliminatethestartandstopofthewaterhammereffect.Thestableandsafeperforman