基于PLC变频调速恒压供水系统毕业设计 2.docVIP

衢州学院 毕业设计（论文） 题　　目：工厂恒压变频调速供水系统设计 作　　者： 陈正言 分 院： 电气与信息工程学院 专业班级： 电气自动化二班 指导教师： 　陈 勇　 职　　称：　　 副教授 　 2013年 12 月 25 日 工 厂 恒 压 变 频 调 速 供 水 系 统 设 计 目 录 摘 要······················································· 4 一．绪论····················································· 5 1.1引言···················································· 5 1.2变频恒压供水产生的背景和意义···························· 6 1.3变频恒压供水的现况········································· 6-7 二．变频恒压供水的理论分析······································ 8 2.1水泵的工作原理············································· 8 2.2供水电机的搭配··········································· 8-9 2.3水泵的调节方式·········································· 9-12 2.4恒压供水系统的能耗分析····································12-16 2.5供水系统的安全性问题·····································16-17 2.6本章小结················································· 17-18 三．变频恒压供水系统的构成及控制原理····························· 18 3.1变频恒压供水控制系统的构成方案····························· 18 3.2变频恒压供水系统的结构··································· 18-20 3.3变频恒压供水系统的控制方案····························· 20-22 3.4变频恒压供水系统的水压恒定控制··························· 23 3.5变频供水水泵加减的控制································· 23-26 3.6本章小节···············································… 26 四．变频恒压供水系统的设计·····································26 4.1乐山市第一水厂的现况···································· 26-28 4.2变频改造的可行性分析·····································28-29 4.3变频电机的确定·············································29 4.4变频器的选型·············································29-30 4.5硬件设计·················································30-31 4.7本章小节·················································32 1 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，城市建设发展十分迅速，同时也对基础设施建设提出了更高的要求。城市供水系统的建设是其中的一个重要方面，供水的可靠性、稳定性、经济性直接影响到用户的正常工作和生活，也直接体现了供水管理水平的高低。传统供水厂，特别是中小供水厂所普遍采用的恒速泵加压供水方式存在效率较低、可靠性不高、自动化程度低等缺点，难以满足当前经济生活的需要。随着人们对供水质量和供水系统可靠性要求的不断提高，需