恒压供水论文[2]

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1、合理开发、节约利用和有效保护水资源一直是一个世界性的艰巨任务。根据高校用水时间集屮，用水量变化较大的特点，分析了校园原供水系统存在成本高，可靠性低，水资源浪费，管网系统待完善的问题。提出以利用自来水水压供水与水泵提水相结合的方式，并配以变频器、软启动器、PLC、微泄露补偿器、压力传感器、液位传感器等不同功能等传感器，根据管网的压力，通过变频器控制水泵的转速，使水管屮的压力始终保持在合适的范帀。从而可以解决因楼层太高导致压力不足及小流量时能耗大的问题。另外水泵耗电功率与电机转速的三次方成正比关系，所以水泵调速运行的节能效果非常明显，平均耗电量较通常供水方式节省近四成。结合使用可编程控制器，可实现

2、主泵变频，副泵软启动，具有短路保护、过流保护功能，工作稳定可靠，大大延长了电机的使用寿命。关键词：恒压变频供水，PLC,压差供水，自动控制ABSTRACTABSTRACTBuildingtheconservation-orientedsociety,thereasonabledevelopment,savesandtheeffectiveprotectingwaterresourcesisanarduoustask.Becentralizedaccordingtotheuniversitywaterusedtime,thewaterconsumptionchangemajorcharacter

3、istic,analyzedthecampusoriginalwatersupplysystemexistencecosttobehigh,thereliabilitywaslow,thewaterresourceswaste,thepipenetworksystemtreatedtheconsummationthequestion・Proposedthatdrawswaterthewaywhichusingtherunningwaterhydraulicpressurewatersupplyandthewaterpumpunifies,andmatchesbytheinverter,thes

4、oftstarter,PLC,Microrevealsthecompensator,thepressuretransmitter,thefluidpositionsensorandsoon.accordingtothenetworkmanagementpressure,controlswaterpump'srotationalspeedthroughtheinverter,causesinwaterpipe'spressuremaintainsatthroughouttheappropriatescope,thusmaysolvetheproblemwhichthefloorhighpress

5、ureistooinsufficientwhensmallcurrentcapacitytheenergyconsumptionisbig.Moreoverthewaterpumpconsumestheelectricpowerandtheelectricalmachineryrotationalspeedisproportionalthreecubedtherelations,thereforethewaterpumpvelocitymodulationmovement'senergyconservationeffectisobvious,theaveragepowerconsumption

6、usualwatersupplywaysaves40%.Theunionusestheprogrammablecontroller,mayrealizethemainpumpfrequencyconversion,theauxiliarypumpsoftstart,hastheshortcircuitprotection,theoverflowprotectionfunctionstably,theworkreliable,lengthenedelectricalmachinery'sservicelifegreatly・Keywords:Constantpressurefrequencyco

7、nversionwatersupply,PLC,differentialpressurewatersupply,automaticcontrol目录摘要IABSTRACTII目录III第一章绪论-1-1」恒压供水问题的提出21.2国内恒压供水系统的现状31.2.1各类供水系统的比较41.3本课题的总体方案・4・131系统的总体布局图-4-1.3.2系统的总体方案-5-1.3.3本系统的特点61.4