给排水工程技术大学本科设计.docVIP

给排水工程技术毕业论文 摘 要 建设节约型社会，合理开发、节约利用和有效保护水资源是一项艰巨任务。根据高校用水时间集中，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水泵，根据的压力，通过变频器控制水泵的转速，使水管中的压力始终保持在合适的范围。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。结合使用可编程控制器，可实现变频，软启动，具有短路保护、过流保护功能，工作稳定可靠，大大延长了的使用寿命。ABSTRACT Building the conservation-oriented society, the reasonable development, saves and the effective protecting water resources is an arduous task. Be centralized according to the university water used time, the water consumption change major characteristic, analyzed the campus original water supply system existence cost to be high, the reliability was low, the water resources waste, the pipe network system treated the consummation the question. Proposed that draws water the way which using the running water hydraulic pressure water supply and the water pump unifies, and matches by the inverter, the soft starter, PLC, Micro reveals the compensator, the pressure transmitter, the fluid position sensor and so on. according to the network management pressure, controls water pumps rotational speed through the inverter, causes in water pipes pressure maintains at throughout the appropriate scope, thus may solve the problem which the floor high pressure is too insufficient when small current capacity the energy consumption is big. Moreover the water pump consumes the electric power and the electrical machinery rotational speed is proportional three cubed the relations, therefore the water pump velocity modulation movements energy conservation effect is obvious, the average power consumption usual water supply way saves 40%.The union uses the programmable controller, may realize the main pump frequency conversion, the auxiliary pump soft start, has the short circuit protection, the overflow protection function stably, the work reliable, lengthened electrical machinerys service life greatly. Key words: Constant pressure frequency conversion water supply, PLC, differential pressure water supply, autom