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1、III恒压供水控制系统设计摘要随着我国社会经济的发展，住房制度改革的不断深入，人们生活水平的不断提高，城市中各类小区建设发展十分迅速，同时也对小区的基础设施建设提出了更高的要求。本文针对某住宅小区的供水要求，设计了一套由PLC、变频器、水泵机组、等主要设备构成的全自动变频恒压供水，具有全自动变频恒压运行和现场手动控制等功能。系统有效地解决了传统供水方式中存在的问题，并具有多种辅助功能，增强了系统的可靠性。论文分析了采取变频调速方式实现恒压供水相对于传统的阀门控制恒压供水方式的节能机理。通过对变频器内置
2、PID模块参数的预置，利用压力表的水压反馈量，构成闭环系统，根据用水量的变化，采取PID调节方式，利用变频泵的连续调节和工泵的分级调节相结合，实现恒压供水且有效节能。关键词：恒压供水，PLC，变频调速IIIDesignofConstantPressureWaterSupplySystemABSTRACTAlongwiththedevelopmentofthesocio-economyofourcountry,thehousingsystemisgoingdeepintoreforms,andpeopl
3、e'slivingstandardisbeingimproved.Atthesametime,inthecity,eachkindofsub-districtconstructionisdevelopingveryquickly,whichputsforwardhigherrequirementfortheinfrastructureconstructionofsub-district.Accordingtotherequirementofwatersupplyinaabidingplace,aset
4、ofautomaticsystemofconstantpressurewatersupplybyusingvariablefrequencyandcontrolling,whichiscomposedofPLC,transducer,pressuresensor,pumpsandelectro-motordesignedtothatend.Thissetofsystemhasthefunctionslikeautomaticconstantpressureoperationbyusingvariabl
5、efrequency,andthefunctionofon-the-spotcontrolbyhandetc.Thesystemhassolvedefficientlytheproblemexistinginthetraditionalwayofwatersupply,whichhasvarioussupplementaryfunctionstostrengthenthereliability.Thepaperanalysesthemechanismofenergysavingthatthewayof
6、watersupplybyusingthemethodofvariablevelocityvariablefrequencyissuperiortothetraditionalwayofconstantpressurewatersupplycontrolledbyvalve.SettingupinadvancetheparameterofthePIDmodularbuilt-inthetransducer,asystemofclosedcircuitusingthefeedbackofhydrauli
7、cpressurehasformed.Accordingtothechangeofwaterconsumption,withPIDandcombiningtheconstantregulationofthepumpoffrequencyconversionwiththeworkfrequencypumpgraderegulation,thesystemofclosedcircuitcanrealizetheconstantpressurewatersupplyandsaveenergyefficien
8、tly.KEYWORDS:constantpressurewatersupply,PLC,variablefrequencyspeedregulatingIII目录摘要IABSTRACTII1绪论11.1恒压供水系统产生的意义11.2恒压供水系统的发展现状21.3本课题来源及主要研究内容22恒压供水系统分析42.1恒压供水系统简介42.1.1恒压供水系统的基本特征42.1.2恒压控制的理论模型42.2恒压供水系统控制方案讨论52.3供水系统安全性62.3
