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很多機手認為抽水揚程越低，水泵電(dian)(dian)(dian)(dian)機(ji)負(fu)(fu)荷越(yue)小(xiao)(xiao)(xiao)(xiao)(xiao)。在(zai)這種錯誤認識的(de)(de)(de)誤導下，選(xuan)購水(shui)泵(beng)(beng)(beng)時(shi)，常將水(shui)泵(beng)(beng)(beng)的(de)(de)(de)揚(yang)(yang)程(cheng)(cheng)(cheng)(cheng)選(xuan)得(de)很高。其(qi)實對于(yu)離(li)心式水(shui)泵(beng)(beng)(beng)而言，當(dang)水(shui)泵(beng)(beng)(beng)型號確定后(hou)，其(qi)消耗功率的(de)(de)(de)大小(xiao)(xiao)(xiao)(xiao)(xiao)是與(yu)水(shui)泵(beng)(beng)(beng)的(de)(de)(de)實際(ji)流量(liang)成正(zheng)比的(de)(de)(de)。而水(shui)泵(beng)(beng)(beng)的(de)(de)(de)流量(liang)會(hui)隨(sui)揚(yang)(yang)程(cheng)(cheng)(cheng)(cheng)的(de)(de)(de)增加而減(jian)(jian)小(xiao)(xiao)(xiao)(xiao)(xiao)，因(yin)而揚(yang)(yang)程(cheng)(cheng)(cheng)(cheng)越(yue)高，流量(liang)越(yue)小(xiao)(xiao)(xiao)(xiao)(xiao)，消耗功率也就(jiu)越(yue)小(xiao)(xiao)(xiao)(xiao)(xiao)。反(fan)之，揚(yang)(yang)程(cheng)(cheng)(cheng)(cheng)越(yue)低，流量(liang)越(yue)大，消耗的(de)(de)(de)功率也就(jiu)越(yue)大。因(yin)此，為了防止電(dian)(dian)(dian)(dian)機(ji)過載，一(yi)般要(yao)求水(shui)泵(beng)(beng)(beng)的(de)(de)(de)實際(ji)抽水(shui)使(shi)用(yong)揚(yang)(yang)程(cheng)(cheng)(cheng)(cheng)不得(de)低于(yu)標定揚(yang)(yang)程(cheng)(cheng)(cheng)(cheng)的(de)(de)(de)60%。所以當(dang)高揚(yang)(yang)程(cheng)(cheng)(cheng)(cheng)用(yong)于(yu)過低揚(yang)(yang)程(cheng)(cheng)(cheng)(cheng)抽水(shui)時(shi)，電(dian)(dian)(dian)(dian)機(ji)容易過載而發(fa)熱，嚴重時(shi)可燒毀電(dian)(dian)(dian)(dian)機(ji)。若應急(ji)使(shi)用(yong)，則需(xu)要(yao)在(zai)出(chu)水(shui)管上裝一(yi)個用(yong)于(yu)調節出(chu)水(shui)量(liang)的(de)(de)(de)閘(zha)閥(fa)，以減(jian)(jian)小(xiao)(xiao)(xiao)(xiao)(xiao)流量(liang)，防止電(dian)(dian)(dian)(dian)機(ji)過載。注意電(dian)(dian)(dian)(dian)機(ji)溫(wen)升，若發(fa)現電(dian)(dian)(dian)(dian)機(ji)過熱，應及(ji)時(shi)關(guan)(guan)小(xiao)(xiao)(xiao)(xiao)(xiao)出(chu)水(shui)口(kou)流量(liang)或關(guan)(guan)機(ji)。這一(yi)點也容易產生(sheng)誤解，有(you)些(xie)機(ji)手(shou)認為堵(du)塞出(chu)水(shui)口(kou)，強(qiang)制減(jian)(jian)少流量(liang)，會(hui)增加電(dian)(dian)(dian)(dian)機(ji)負(fu)(fu)荷。其(qi)實正(zheng)好相反(fan)，正(zheng)規的(de)(de)(de)大功率離(li)心泵(beng)(beng)(beng)排灌機(ji)組的(de)(de)(de)出(chu)水(shui)管上都裝有(you)閘(zha)閥(fa)，為了減(jian)(jian)小(xiao)(xiao)(xiao)(xiao)(xiao)機(ji)組啟動時(shi)的(de)(de)(de)電(dian)(dian)(dian)(dian)機(ji)負(fu)(fu)荷，應先關(guan)(guan)閉閘(zha)閥(fa)，待電(dian)(dian)(dian)(dian)機(ji)啟動后(hou)再逐漸開(kai)啟閘(zha)閥(fa)就(jiu)是這個道理(li)。

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