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1、ConstantPressureWaterSupplySystemBasedplcAbstract:Basedonesimpleanalysisofthemethodsforwatersupplyuseddomesticallyandabroad,thispaperdiscussestheprincipleandsystem’sstructureofautomaticwatersupplysystembyusingfrequencyconversionspeedregulationindetail.Thenthesystem’sadvantagesa
2、rediscussedandsomekeyproblemsthatshouldbepayattentiontodesigningarepresented.Keyword:Frequencyconversionspeedregulation;watersupplywithstablepressure:PIDregulator.1、ForewordAtpresent,supplywaterinresidentialareaandlifeoftheskyscraperofourcountrygenerallyadoptthewaycommonfrequen
3、tly.Ithasheavyenergyconsumption,highnoise,andtherehasagreatdealofquestionsinthesourceofwater,suchassecondarypollutionetc.Anditisakindofcomparativelyidealmodetoadjustthewatersupplydevicecontrolledrapidlywithfrequencyconversion.Enteringthemiddleandlaterperiodsofthe1990s,asthespee
4、dtechnologyoffrequencyconversionachievesmoredevelopmentbecomesperfect,thewayofthefull-automaticconstantpressurethatbasedonthistechnologysuppliedwaterhasalreadybeenwidelyusedinthedevelopedcountry,andisbecomingriper.Inrecentyears,authorshasmadesomerealworkonrapidlytothetransforma
5、tioninfrequencyconversionsupplywaterdesignandconstructionofcontrolsystem,haveaccumulatedsomeexperience,andhasformedtheviewonsomequestions.Thereasonwhytheenergy-conservingprinciplefrequencyconversionofthewaterpumpsystemofspeedadjustment becomespopularized,ismainlybecausethatith
6、asabetterenergy-conservingresult.Topumpsystemoffrequencyconversion,thewaterpumpafteradjustingthespeedhasfunctionalrelationofthefollowing:Q1/Q2=n1/n2 (1)H1/H2=(n1/n2)2 (2)ofthetype.Q1,Q2representstheflowbeforeandafterthespeedforthewaterpumprespectively;N1,n2representstherotati
7、onalspeedbeforeandafterthespeedforthewaterpumprespectively;H1,H2representstheliftbeforeandafterthespeedforthewaterpumprespectively.Accordingtheabove:H1/H2=(f1/f2)2.Namelyrealliftofawaterpumpispowerthesquareof frequencyindirectradio.Thereforechangingthepowersupplyfrequencyofthe
8、electricalmachineryofwaterpumpthroughthefrequencyconve
