摘要随着人类科技的发展和进步，城市中高层楼房的供水问题越来越突出。为了提高城市高层建筑的供水可靠性，不会因为压力的变化导致供水的影响，同时要求保证供水的质量和安全性，比如发生意外大火时能够可靠的供水。为了上述两方面要求，新的供水形式和控制技术应运而生，这就是要研究的PLC控制的恒压供水。PLC恒压供水系统控制包括了城市生活用水的恒压控制和消防用水的恒压控制。用PLC控制的恒压变频控制系统可以提高系统的可靠性，方便供水系统的控制，同时还保证了供水质量。75583

本文论述了PLC恒压供水系统的发展，基本原理和组成基础，同时介绍了可编程控制器PLC在这系统中的地位和作用。这次设计从系统的设计方案与实际生活分析着手，与城市供水的需要紧密联系，尽量做到系统能够稳定运行，简单操作，解决城市高层建筑的供水问题，保证供水快速安全。

毕业论文关键词：恒压供水   PLC   变频技术

Constant Pressure Water Supply System Based on PLC

Abstract With the development and progress of human science and technology, the water supply of high-rise buildings in the city is becoming more and more prominent。 In order to improve urban high-rise building water supply reliability, it will not lead to changes in pressure affect the water supply, while required to ensure water quality and safety, such as when the fire accident can be a reliable water supply。 For two requirements, and new forms of water control technology came into being, which is the study of PLC control constant pressure water supply。 PLC constant pressure water supply control system includes a constant voltage control and the constant voltage control fire water municipal water。 With constant frequency control system, PLC control can improve system reliability, easy control of the control of the water supply system, but also to ensure water quality。

   This design discussed development PLC constant pressure water supply system, the basic principles and basic composition composed introduced programmable controller PLC status and role in this system。 The design started, close contact with the city's water supply needs, try to make the system stable operation, simple operation, solve the water problems of urban high-rise buildings, to ensure fast and safe water supply from the system design and analysis of real life。

Key words: constant pressure water supply   PLC   frequency conversion technology

目录

摘要 I

Abstract II

目录 III

1 绪论 1

1。1供水系统的发展过程 1

1。2恒压供水应用场合以及意义 2

1。3本文的主要研究内容 2

1。4本章小结 3

2 恒压供水系统 4

2。1恒压供水的构成 4

2。2供水系统的控制流程 6

2。3系统主电路设计 7

2。4本章小结 8

3 变频器压力传感器以及水泵 9

3。1 变频器的基本结构 9

3。2 变频器工作原理 9

3。3 变频器的操作方式 10

3。4 变频器的选型