【電(dian)(dian)水壺溫(wen)度傳感器】電(dian)(dian)熱(re)水壺用溫(wen)度傳感器是(shi)什么 工作原理大致是(shi)什么
電(dian)(dian)熱水壺用(yong)(yong)溫度(du)(du)傳感器(qi)是一(yi)種(zhong)用(yong)(yong)雙金屬片制作的熱敏(min)器(qi)件，溫度(du)(du)低時它(ta)朝一(yi)個(ge)方向(xiang)彎(wan)曲，溫度(du)(du)達到規定(ding)值時就向(xiang)另一(yi)個(ge)方向(xiang)彎(wan)曲將(jiang)電(dian)(dian)路斷開，停止加(jia)熱。電(dian)(dian)熱壺中就巧妙地使用(yong)(yong)了這(zhe)種(zhong)傳感器(qi)。
1．電熱水壺加熱電路的工作過程
交(jiao)流220V電(dian)(dian)(dian)源(yuan)為電(dian)(dian)(dian)熱(re)(re)水壺供電(dian)(dian)(dian)，交(jiao)流電(dian)(dian)(dian)源(yuan)的(de)(de)L（火線）端(duan)(duan)經熱(re)(re)熔斷(duan)器(qi)(qi)(qi)(qi)FU加到煮水加熱(re)(re)器(qi)(qi)(qi)(qi)EM和保(bao)(bao)溫加熱(re)(re)器(qi)(qi)(qi)(qi)EH2的(de)(de)一(yi)端(duan)(duan)，交(jiao)流電(dian)(dian)(dian)源(yuan)的(de)(de)N（零線）端(duan)(duan)經溫控器(qi)(qi)(qi)(qi)ST加到煮水加熱(re)(re)器(qi)(qi)(qi)(qi)的(de)(de)另一(yi)端(duan)(duan)，同時交(jiao)流電(dian)(dian)(dian)源(yuan)的(de)(de)N（零線）端(duan)(duan)經二極管VIE℃和選擇(ze)開關SA加到保(bao)(bao)溫加熱(re)(re)器(qi)(qi)(qi)(qi)EH2的(de)(de)另一(yi)端(duan)(duan)。使(shi)煮水加熱(re)(re)器(qi)(qi)(qi)(qi)和保(bao)(bao)溫加熱(re)(re)器(qi)(qi)(qi)(qi)兩(liang)端(duan)(duan)都有交(jiao)流電(dian)(dian)(dian)壓，而開始加熱(re)(re)，如(ru)圖所示。
2．加熱控制電路的工作過程
電(dian)(dian)熱(re)(re)水壺剛開始煮(zhu)水時，溫(wen)(wen)控(kong)器(qi)ST處(chu)于低溫(wen)(wen)狀態。此時，溫(wen)(wen)控(kong)器(qi)ST兩引線端(duan)之(zhi)間是導通的，為(wei)電(dian)(dian)源供電(dian)(dian)提供通路(lu)，此時，綠(lv)(lv)指示(shi)燈(deng)亮，紅指示(shi)燈(deng)兩端(duan)無電(dian)(dian)壓，不亮。當水瓶中的溫(wen)(wen)度(du)超過(guo)96℃時（水開了），溫(wen)(wen)度(du)控(kong)制器(qi)ST自動斷開，停止為(wei)煮(zhu)水加(jia)熱(re)(re)器(qi)供電(dian)(dian)。此時，保(bao)(bao)溫(wen)(wen)加(jia)熱(re)(re)器(qi)兩端(duan)仍有(you)交流220V電(dian)(dian)壓，但由于保(bao)(bao)溫(wen)(wen)加(jia)熱(re)(re)器(qi)電(dian)(dian)阻值(zhi)較大所產(chan)生的能(neng)量只有(you)煮(zhu)水加(jia)熱(re)(re)器(qi)的1/20，因此只起到(dao)保(bao)(bao)溫(wen)(wen)的作用。此時，交流220V經(jing)EM為(wei)紅指示(shi)燈(deng)供電(dian)(dian)綠(lv)(lv)指示(shi)燈(deng)滅，紅指示(shi)燈(deng)亮。
如果(guo)電熱(re)水瓶中水的(de)溫度降低了，溫度控制(zhi)器ST又會自動接通，煮水加熱(re)器繼續加始終使水瓶中的(de)開水保持(chi)在(zai)90℃以上。
