无负(fu)压供(gong)水设备的(de)使用(yong)在(zai)当(dang)前(qian)的(de)水循(xun)环系统(tong)当(dang)中(zhong)(zhong)占据着重要的(de)位置，是人们生(sheng)活当(dang)中(zhong)(zhong)对(dui)于(yu)水应用(yong)需(xu)求当(dang)中(zhong)(zhong)不可(ke)缺少的(de)重要设备之(zhi)一(yi)。

　　无负压供水设备的工作原理是采用微机控制(zhi)(zhi)变(bian)(bian)频(pin)调(diao)速实(shi)现恒(heng)压(ya)供(gong)水(shui)(shui)(shui)(shui)，其中的(de)负压(ya)补(bu)偿系(xi)统克服(fu)了(le)对管网的(de)不(bu)(bu)良影(ying)响，无负压(ya)供(gong)水(shui)(shui)(shui)(shui)设(she)备设(she)定(ding)某一压(ya)力(li)(li)值(zhi)。如(ru)果(guo)市(shi)(shi)政(zheng)管网压(ya)力(li)(li)高于(yu)设(she)定(ding)压(ya)力(li)(li)值(zhi)时，压(ya)力(li)(li)变(bian)(bian)送器(qi)将(jiang)该信(xin)号(hao)送到(dao)(dao)变(bian)(bian)频(pin)控制(zhi)(zhi)柜(ju)，使水(shui)(shui)(shui)(shui)泵机组处(chu)于(yu)休(xiu)眠状(zhuang)态。自来水(shui)(shui)(shui)(shui)则可通(tong)过(guo)连(lian)通(tong)管路直接到(dao)(dao)达用户(hu)管网实(shi)施供(gong)水(shui)(shui)(shui)(shui)。当市(shi)(shi)政(zheng)管网压(ya)力(li)(li)下(xia)降(jiang)或(huo)用户(hu)管网用水(shui)(shui)(shui)(shui)量增(zeng)加时，压(ya)力(li)(li)传感(gan)器(qi)将(jiang)用户(hu)管网压(ya)力(li)(li)低于(yu)设(she)定(ding)值(zhi)的(de)信(xin)号(hao)反馈给变(bian)(bian)频(pin)控制(zhi)(zhi)柜(ju)中的(de)PID控制(zhi)(zhi)器(qi)，并(bing)通(tong)过(guo)其启(qi)动水(shui)(shui)(shui)(shui)泵机组，调(diao)整变(bian)(bian)频(pin)器(qi)的(de)输出频(pin)率，调(diao)节水(shui)(shui)(shui)(shui)泵转速以保持恒(heng)压(ya)供(gong)水(shui)(shui)(shui)(shui);如(ru)果(guo)少数(shu)泵启(qi)动尚不(bu)(bu)能满足供(gong)水(shui)(shui)(shui)(shui)要求(qiu)时，变(bian)(bian)频(pin)器(qi)将(jiang)控制(zhi)(zhi)多台泵变(bian)(bian)频(pin)或(huo)工频(pin)运行，以达到(dao)(dao)恒(heng)压(ya)变(bian)(bian)量供(gong)水(shui)(shui)(shui)(shui)的(de)要求(qiu)。

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