在使(shi)用(yong)(yong)潛(qian)水(shui)(shui)(shui)(shui)排(pai)污(wu)泵(beng)時(shi)，若其(qi)使(shi)用(yong)(yong)環境的(de)水(shui)(shui)(shui)(shui)位(wei)低于潛(qian)水(shui)(shui)(shui)(shui)泵(beng)體時(shi)，以交流(liu)電(dian)做動力的(de)潛(qian)水(shui)(shui)(shui)(shui)排(pai)污(wu)泵(beng)則會脫水(shui)(shui)(shui)(shui)運(yun)行(xing)。但是，這種情況下潛(qian)水(shui)(shui)(shui)(shui)排(pai)污(wu)泵(beng)便不能很好的(de)散(san)熱，潛(qian)水(shui)(shui)(shui)(shui)排(pai)污(wu)泵(beng)電(dian)機(ji)在幾秒鐘內即可燒(shao)毀。因此，在用(yong)(yong)戶使(shi)用(yong)(yong)潛(qian)水(shui)(shui)(shui)(shui)排(pai)污(wu)泵(beng)時(shi)都會提醒廣(guang)大用(yong)(yong)戶：潛(qian)水(shui)(shui)(shui)(shui)排(pai)污(wu)泵(beng)嚴禁(jin)脫水(shui)(shui)(shui)(shui)運(yun)行(xing)!

　　為(wei)了很好的解決(jue)這一問(wen)題，我們(men)需要設計一種當水位低(di)于設定水位時，能自動切斷潛水排(pai)(pai)污(wu)泵工作電源的電子式潛水排(pai)(pai)污(wu)泵脫水保護器。

　　為(wei)了(le)實現以上(shang)目的(de)，我們(men)需要設(she)置一個水(shui)位傳(chuan)感(gan)器(qi)，該傳(chuan)感(gan)器(qi)將水(shui)位信(xin)(xin)號(hao)(hao)轉換為(wei)電(dian)(dian)(dian)信(xin)(xin)號(hao)(hao)，送入由(you)電(dian)(dian)(dian)阻R1、三端(duan)開關元件和繼電(dian)(dian)(dian)器(qi)線圈組(zu)成的(de)信(xin)(xin)號(hao)(hao)處理電(dian)(dian)(dian)路2中進行信(xin)(xin)號(hao)(hao)處理。當水(shui)位低(di)于設(she)定值時，信(xin)(xin)號(hao)(hao)處理電(dian)(dian)(dian)路2輸出(chu)一個控制(zhi)信(xin)(xin)號(hao)(hao)驅動執行電(dian)(dian)(dian)路3工作，將自動切(qie)斷(duan)電(dian)(dian)(dian)源，從而保護潛水(shui)排污(wu)泵電(dian)(dian)(dian)機不被燒毀。

　　其中，三端開(kai)關元件可以采(cai)用(yong)(yong)場效(xiao)應管(guan)、晶體管(guan)或(huo)可控硅類(lei)半(ban)導(dao)體分立器(qi)件，也可以采(cai)用(yong)(yong)開(kai)關集成(cheng)電路;水位傳(chuan)感器(qi)可以采(cai)用(yong)(yong)濕(shi)敏或(huo)光(guang)敏類(lei)電子敏感元件，也可以采(cai)用(yong)(yong)雙(shuang)金屬片式機械傳(chuan)感器(qi);為(wei)使信號處(chu)理電路2能正(zheng)常工作，R1的取值范圍應在0.5Ω-100MΩ之間。

　　綜(zong)上所述，由于(yu)采(cai)用(yong)了電(dian)子線路，使得潛(qian)水(shui)(shui)排(pai)(pai)污泵在使用(yong)中可(ke)靠(kao)性更高。當水(shui)(shui)位一旦低于(yu)設定(ding)值，潛(qian)水(shui)(shui)排(pai)(pai)污泵工作電(dian)源立即(ji)被切斷;另外，其通用(yong)性強，無論是(shi)(shi)單相(xiang)家(jia)用(yong)潛(qian)水(shui)(shui)排(pai)(pai)污泵還是(shi)(shi)三相(xiang)工業潛(qian)水(shui)(shui)排(pai)(pai)污泵，功(gong)率從(cong)幾(ji)百瓦(wa)到幾(ji)十千瓦(wa)均可(ke)很好的(de)(de)保護潛(qian)水(shui)(shui)排(pai)(pai)污泵，使得潛(qian)水(shui)(shui)排(pai)(pai)污泵的(de)(de)使用(yong)壽命更長。