【電(dian)水(shui)壺溫度(du)傳感器】電(dian)熱(re)水(shui)壺用溫度(du)傳感器是(shi)什么(me) 工(gong)作原理大(da)致是(shi)什么(me)
電熱(re)(re)水(shui)壺用(yong)溫度(du)傳感器是一種用(yong)雙金屬片制作(zuo)的熱(re)(re)敏(min)器件,溫度(du)低(di)時(shi)它朝一個方向(xiang)彎曲(qu),溫度(du)達到規定值時(shi)就向(xiang)另一個方向(xiang)彎曲(qu)將電路(lu)斷開(kai),停止加熱(re)(re)。電熱(re)(re)壺中就巧妙地使(shi)用(yong)了這種傳感器。
1.電熱水壺加熱電路的工作過程
交(jiao)流(liu)(liu)(liu)220V電(dian)源(yuan)(yuan)為電(dian)熱(re)(re)水壺(hu)供(gong)電(dian),交(jiao)流(liu)(liu)(liu)電(dian)源(yuan)(yuan)的(de)L(火線)端經熱(re)(re)熔斷器(qi)FU加(jia)(jia)到煮水加(jia)(jia)熱(re)(re)器(qi)EM和保溫(wen)(wen)加(jia)(jia)熱(re)(re)器(qi)EH2的(de)一(yi)端,交(jiao)流(liu)(liu)(liu)電(dian)源(yuan)(yuan)的(de)N(零線)端經溫(wen)(wen)控器(qi)ST加(jia)(jia)到煮水加(jia)(jia)熱(re)(re)器(qi)的(de)另一(yi)端,同(tong)時交(jiao)流(liu)(liu)(liu)電(dian)源(yuan)(yuan)的(de)N(零線)端經二極管VIE℃和選擇開關(guan)SA加(jia)(jia)到保溫(wen)(wen)加(jia)(jia)熱(re)(re)器(qi)EH2的(de)另一(yi)端。使煮水加(jia)(jia)熱(re)(re)器(qi)和保溫(wen)(wen)加(jia)(jia)熱(re)(re)器(qi)兩端都有交(jiao)流(liu)(liu)(liu)電(dian)壓,而開始加(jia)(jia)熱(re)(re),如圖所示。
2.加熱控制電路的工作過程
電(dian)(dian)(dian)熱(re)水(shui)(shui)壺剛開(kai)始煮(zhu)水(shui)(shui)時,溫控(kong)器(qi)(qi)(qi)ST處于低(di)溫狀態。此(ci)時,溫控(kong)器(qi)(qi)(qi)ST兩(liang)引線(xian)端之(zhi)間是導通的(de)(de),為(wei)電(dian)(dian)(dian)源(yuan)供(gong)電(dian)(dian)(dian)提供(gong)通路,此(ci)時,綠(lv)指示(shi)燈(deng)亮,紅(hong)(hong)指示(shi)燈(deng)兩(liang)端無電(dian)(dian)(dian)壓,不(bu)亮。當水(shui)(shui)瓶中的(de)(de)溫度超過(guo)96℃時(水(shui)(shui)開(kai)了),溫度控(kong)制(zhi)器(qi)(qi)(qi)ST自動斷開(kai),停止為(wei)煮(zhu)水(shui)(shui)加(jia)熱(re)器(qi)(qi)(qi)供(gong)電(dian)(dian)(dian)。此(ci)時,保溫加(jia)熱(re)器(qi)(qi)(qi)兩(liang)端仍有交流220V電(dian)(dian)(dian)壓,但由于保溫加(jia)熱(re)器(qi)(qi)(qi)電(dian)(dian)(dian)阻值較大所產生(sheng)的(de)(de)能量只有煮(zhu)水(shui)(shui)加(jia)熱(re)器(qi)(qi)(qi)的(de)(de)1/20,因(yin)此(ci)只起到(dao)保溫的(de)(de)作用。此(ci)時,交流220V經EM為(wei)紅(hong)(hong)指示(shi)燈(deng)供(gong)電(dian)(dian)(dian)綠(lv)指示(shi)燈(deng)滅,紅(hong)(hong)指示(shi)燈(deng)亮。
如果電熱水(shui)(shui)(shui)瓶中水(shui)(shui)(shui)的溫度(du)降低了,溫度(du)控制(zhi)器(qi)ST又(you)會自動接通,煮(zhu)水(shui)(shui)(shui)加(jia)熱器(qi)繼續加(jia)始終使水(shui)(shui)(shui)瓶中的開水(shui)(shui)(shui)保持在90℃以(yi)上。