3、所需流量，高效节能；并且具有相当高的性能价格比。关键词：恒压给水，单片机，变频器，PID调节Abstract：Through change the frequency to adjust the press of the water supply system ,the control device can improve the water supply environment of the water pipe net biggest.The system can according the v
4、arieble tube net pressure to regulate the water pump motor to turn automatically and decide if more water pump engineering used or not,so it can make the exit of the net's main stem to keep at the constant pressure that settled, the whole water supply
5、system keeps always efficiently economic and circulate in the best situation efficiently.The frequency-change constant pressure water supply system contains the transduser, the PID regulated part, the pressure censor and the low-pressure electricity di
6、vice etc., use pumps to carry on constant press variable speed water supply system .It spreads the censor’s feeling to know the net’ated part, after analysis operation, sigle-chip microcomputer outputs the signal to change the frequency of the transdue
7、r, use the transduer output to control water pump’s speed.While it can control the pump number by the net’s variable pressure, while water supply is very few or no man use water,enter the pump enter the dormancy appearance, these are all controled by t
8、he sigle-chip microcomputer. This text put forward a kind of frequency-change variable speed project.That system do not need the water tower or the pressure bottles, point out that change frequency to adjust the speed have the economic
