【電(dian)水壺(hu)溫度傳(chuan)感器】電(dian)熱水壺(hu)用溫度傳(chuan)感器是什(shen)么 工作(zuo)原理大致是什(shen)么
電(dian)熱(re)水壺用(yong)溫(wen)(wen)(wen)度(du)傳感器是一(yi)種(zhong)用(yong)雙金屬片(pian)制作的熱(re)敏器件(jian)，溫(wen)(wen)(wen)度(du)低時它朝一(yi)個方向彎曲，溫(wen)(wen)(wen)度(du)達(da)到規定值時就(jiu)向另(ling)一(yi)個方向彎曲將電(dian)路斷開(kai)，停止(zhi)加(jia)熱(re)。電(dian)熱(re)壺中就(jiu)巧妙(miao)地使用(yong)了這種(zhong)傳感器。
1．電熱水壺加熱電路的工作過程
交流220V電(dian)(dian)(dian)(dian)源為(wei)電(dian)(dian)(dian)(dian)熱(re)(re)水(shui)壺供電(dian)(dian)(dian)(dian)，交流電(dian)(dian)(dian)(dian)源的(de)(de)L（火線(xian)）端(duan)(duan)經(jing)熱(re)(re)熔斷器(qi)(qi)FU加(jia)(jia)到(dao)煮(zhu)水(shui)加(jia)(jia)熱(re)(re)器(qi)(qi)EM和保(bao)溫加(jia)(jia)熱(re)(re)器(qi)(qi)EH2的(de)(de)一端(duan)(duan)，交流電(dian)(dian)(dian)(dian)源的(de)(de)N（零線(xian)）端(duan)(duan)經(jing)溫控器(qi)(qi)ST加(jia)(jia)到(dao)煮(zhu)水(shui)加(jia)(jia)熱(re)(re)器(qi)(qi)的(de)(de)另一端(duan)(duan)，同時(shi)交流電(dian)(dian)(dian)(dian)源的(de)(de)N（零線(xian)）端(duan)(duan)經(jing)二極管VIE℃和選擇開(kai)關SA加(jia)(jia)到(dao)保(bao)溫加(jia)(jia)熱(re)(re)器(qi)(qi)EH2的(de)(de)另一端(duan)(duan)。使煮(zhu)水(shui)加(jia)(jia)熱(re)(re)器(qi)(qi)和保(bao)溫加(jia)(jia)熱(re)(re)器(qi)(qi)兩端(duan)(duan)都(dou)有交流電(dian)(dian)(dian)(dian)壓(ya)，而開(kai)始加(jia)(jia)熱(re)(re)，如圖所(suo)示。
2．加熱控制電路的工作過程
電(dian)熱(re)水(shui)(shui)(shui)壺剛(gang)開始(shi)煮(zhu)水(shui)(shui)(shui)時(shi)，溫(wen)(wen)(wen)(wen)(wen)控(kong)器(qi)ST處于(yu)低溫(wen)(wen)(wen)(wen)(wen)狀態。此(ci)時(shi)，溫(wen)(wen)(wen)(wen)(wen)控(kong)器(qi)ST兩引線端(duan)之間是導通(tong)(tong)的(de)，為(wei)電(dian)源供(gong)(gong)電(dian)提供(gong)(gong)通(tong)(tong)路，此(ci)時(shi)，綠(lv)指(zhi)示燈(deng)亮，紅指(zhi)示燈(deng)兩端(duan)無電(dian)壓(ya)，不(bu)亮。當水(shui)(shui)(shui)瓶(ping)中(zhong)的(de)溫(wen)(wen)(wen)(wen)(wen)度(du)(du)超(chao)過96℃時(shi)（水(shui)(shui)(shui)開了），溫(wen)(wen)(wen)(wen)(wen)度(du)(du)控(kong)制器(qi)ST自動(dong)斷開，停止為(wei)煮(zhu)水(shui)(shui)(shui)加熱(re)器(qi)供(gong)(gong)電(dian)。此(ci)時(shi)，保溫(wen)(wen)(wen)(wen)(wen)加熱(re)器(qi)兩端(duan)仍有交(jiao)流(liu)220V電(dian)壓(ya)，但由于(yu)保溫(wen)(wen)(wen)(wen)(wen)加熱(re)器(qi)電(dian)阻值較(jiao)大所產生(sheng)的(de)能量只有煮(zhu)水(shui)(shui)(shui)加熱(re)器(qi)的(de)1/20，因此(ci)只起到保溫(wen)(wen)(wen)(wen)(wen)的(de)作用。此(ci)時(shi)，交(jiao)流(liu)220V經(jing)EM為(wei)紅指(zhi)示燈(deng)供(gong)(gong)電(dian)綠(lv)指(zhi)示燈(deng)滅，紅指(zhi)示燈(deng)亮。
如果電熱水(shui)(shui)瓶(ping)中水(shui)(shui)的(de)溫度(du)降低了，溫度(du)控制(zhi)器ST又(you)會自動(dong)接通，煮水(shui)(shui)加(jia)熱器繼續加(jia)始終使(shi)水(shui)(shui)瓶(ping)中的(de)開水(shui)(shui)保持在90℃以上。
