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内蒙古科技大学毕业设计说明书（毕业论文）I消防水泵变频调速系统摘要随着经济的发展和社会主义现代化的进程的推进，城市规模越来越大，高层建筑越来越多，大工业区不断增加，石油化工产业方兴未艾，豪华商场，宾馆拔地而起，人员和物质财富不断向城市集中，一旦失火，就可能对公共安全造成很大的威胁，所以消防工作越来越受到社会的重视。本论文根据消防供水的供水要求，设计了一套基于PLC的变频调速恒压供水系统,并利用组态软件开发良好的运行管理界面。变频恒压供水系统由可编程控制器、变频器、水泵机组、压力传感器、工控机等构成。本系统包含两台水泵电机，它们组成变频循环运行方式。采用变频器实现对三相水泵电机的变频调速，运行切换采用“先启先停”的原则。压力传感器检测当前水压信号，送入PLC与设定值比较后进行PID运算，从而控制变频器的输出电压和频率，进而改变水泵电机的转速来改变供水量，最终保持管网压力稳定在设定值附近。关键词：消防水泵；变频调速；PLC内蒙古科技大学毕业设计说明书（毕业论文）IIFirepumpfrequencyconversionspeedregulationsystemAbstractWiththedevelopmentofeconomyandtheadvancementofsocialistmodernization,thecityscaleismoreandmorebig,moreandmorehigh-risebuildings,largeindustrialzoneincreasing,petroleumchemicalindustryisflourishing,luxuryshoppingmalls,hotels,personnelandmaterialwealthtourbanconcentration,oncethefire,mayposesagreatthreattopublicsafety,sothefirecontrolworkisbecomingmoreandmorebroughttotheattentionofthesociety.Accordingtotherequirementsofthefirewatersupply,thispaperdesignedasetofvariablefrequencyspeedregulationconstantpressurewatersupplysystembasedonPLC,andbyusingconfigurationsoftwaretodevelopgoodoperationmanagementinterface.Variablefrequencyconstantpressurewatersupplysystembyprogrammablecontroller,inverter,pump,pressuresensors,industrialcontrol,etc.Thissystemincludestwowaterpumpmotors,theiroperationmodeoffrequencyconversioncycle.Forthree-phasepumpmotorfrequencycontrolofmotorspeedisrealizedbyusingfrequencyconverter,switchingoperationbasedontheprincipleofinceptiontostop.Currenthydraulicpressuresensorsignal,intoPLCPIDarithmeticisaftercomparedwiththesetvalue,soastocontroltheoutputvoltageandfrequencyoftheinverter,andchangethewaterpumpmotorspeedtochangewatersupply,eventuallymaintainstabilityofthepipenetworkpressurenearthesetpoint.Keywords:firepump;Frequencycontrolofmotorspeed;PLC内蒙古科技大学毕业设计说明书（毕业论文）III目录摘要...........................................................................................................................................IAbstract......................................................................................................................................II目录........................................................................................................................................III第一章绪论..............................................................................................................................11.1消防的重要性.............................................................................................................11.2消防水泵变频调速系统的介绍................................................................................11.3消防泵变频调速控制效果及经济效益分析.............................................................21.4变频调速系统的发展.................................................................................................21.5变频调速系统的意义.................................................................................................31.6本章小结.....................................................................................................................4第二章工艺介绍与方案设计原理..........................................................................................52.1消防水泵变频调速系统工艺选择............................................................................52.2消防水泵变频调速系统工艺要求.............................................................................52.3总体方案设计............................................................................................................62.3.1变频调速恒压供水系统.................................................................................62.3.2变频器睡眠功能的实现.................................................................................82.3.3消防水泵的自动巡检.....................................................................................82.4本章小结...................................................................................................................10第三章硬件设计....................................................................................................................113.1PLC的选型...............................................................................................................113.1.1PLC的简介.....................................................................................................113.1.2S7-300系列PLC及其扩展模块的选型.....................................................143.2电动机的选型...........................................................................................................203.3变频器的选型...........................................................................................................203.4压力传感器的选型...................................................................................................233.5自动巡检装置的选型...............................................................................................243.6触摸屏的选型...........................................................................................................243.7继电器的选型...........................................................................................................25内蒙古科技大学毕业设计说明书（毕业论文）IV3.8接触器的选型..........