毕业设计-小区无塔上水变频调速恒压供水及消防用水电气设计.doc

目 录 第一章 变频调速恒压供水系统的现状和发展………………………………1 1.1 变频调速恒压供水的目的和意义……………………………………………1 1.2变频调速及PLC在供水行业中的应用………………………………………6 1.3 毕业设计任务及要求…………………………………………………………11 第二章变频调速的节能、调速原理……………………………………………13 2.1供水系统概述…………………………………………………………………14 2.2变频调速恒压供水系统分析…………………………………………………16 2.3变频调速的节能、调速原理…………………………………………………19 2.4 变频调速恒压供水工况分析与能耗机理分析………………………………20 2.5调速范围的确定………………………………………………………………21 2.6本章小结………………………………………………………………………24 第三章变频调速恒压供水系统的设计………………………………………26 3.1系统的方案设计………………………………………………………………27 3.2工作流程与工作过程…………………………………………………………29 3.3系统的控制原理及组成………………………………………………………30 3.4系统硬件设计…………………………………………………………………3 3.5系统工作过程说明……………………………………………………………54 3.6本章小结………………………………………………………………………32 第四章器件选择……………………………………………………………………26 4.1水泵的选择……………………………………………………………………27 4.2电动机的选择…………………………………………………………………29 4.3变频器的选择…………………………………………………………………30 4.4可编程控制器PLC的选择……………………………………………………31 4.5其它电气元件的选择…………………………………………………………32 全文总结………………………………………………………………………………57 参考文献………………………………………………………………………………59 致 谢………………………………………………………………………………60 摘 要 本论文在分析了供水自动控制系统的发展现状和特点的基础上，结合我国中小城市供水厂的现状，设计了一套以变频调速技术为基础的恒压供水计算机监控系统。该系统综合运用计算机技术、变频调速技术以及自动控制技术，实现了恒压供水的参数整定自动控制，保证了随时供水系统最佳运行 the basis of analyzing the development and characteristic of automatic system of water supply, combined with status in quo of the waterworks in our country, this paper designs a suit of computer controlling system based on variable frequency speed-regulating technology. Through using computer technology, variable frequency speed-regulating technology and automation technology, the system can make the water pressure of water supply system constantly by the way of parameters self-tuning. It assuredly makes the water supply system work on all cylinders. This article has in detail analyzed and researched the principle of economical electrical energy of the main circuit of this systerm with the newest frequency invertor,Operated on this main circuit ,this article has designed the control-circuit,then have realized that frequency invertor can supply wa