PLC在恒压供水控制中的应用.docVIP

内容摘要 生产及生活都离不开水。但如果水源离用水场所较远，就需要管路的输送。而将水送到较远或较高的地方，管路中是需要有一定水压的，水压高了，才能将水输送到远处或较高的楼层。产生水压的设备是水泵，水泵转动的越快，产生的水压越高。传统的维持水压的方法是建造水塔，水泵开着时将水打到水塔中，水泵休息时，借助水塔的水位继续供水。水塔中的水位变化相对水塔的高度来说很小，也就是说水塔能维持供水管路中水压的基本恒定。但是，建造水塔需要花费财力，水塔还会造成水的二次污染。 本设计是针对居民生活用水和消防用水而设计的。由变频器、PLC、压力变送器组成控制系统，调节水泵的输出流量。电动机泵组由三台水泵组成，用水时，由变频器或工频电网供电，根据供水系统出口水压来控制变频器电动机泵组的速度和切换，使系统运行在最合理状态，保证供水。本论文设计与实现通过组态王进行数据传输的远程网络巡回监控系统。具体讲述了系统的总体设计与软件的实现，并对系统进行了说明。 本论文介绍了恒压供水的基本原理及其系统构成的基础，说明了PLC及变频器在恒压供水系统中所担任的角色。从系统的整体设计方案和实际需求分析开始，紧密的联系实际生活的需要，力求做到使系统运行稳定，操作简便，解决实际中的问题，保证供水安全、快捷、可靠。恒压供水保证了供水质量，以PLC为主机的控制系统丰富了系统的控制功能，提高了系统的可靠性。 关键词： 恒压供水； 变频调速； PLC; 组态王监控系统 Abstract Production and life are insepatable from the water.But if the water far away from the place of water,it needs the transmission pipeline.The higher the water to distant or local,is the need for a certain pipe water pressure,high water pressure to move water to higher floors or the distance.The device is a pump produced water pressure,waterpump rotating faster,the higher the pressure generated.The traditional approach is to maintain the pressure build towers,water pumps turned on the water hitting the towers,the water pump breaks,the water level continues to supply with water tower.Water tower water tower in the height of water level change is relatively small,meaning that water supply pipes in the water tower to maintain water pressure is almost constant.However,the construction of water tower takes a financial and towers also cause secondry pollution of water. So,can not be achieved through constant pressure water supply towers then?Certainly,that is introduced into the design of PLC used in constant pressure water supply.Water consumption,the increase in the quantity or inprove the water pump rotational speed to maintain constant water pressure in the pipe network,water and it takes hours to make the opposite adjustment.This is the PLC control constant pressure water supply of the basic ideas. This is designed for residential water and fire wat