【電(dian)水壺溫度(du)傳(chuan)感器】電(dian)熱水壺用溫度(du)傳(chuan)感器是(shi)什么 工作原理大致是(shi)什么
電熱(re)(re)(re)水壺(hu)用(yong)溫(wen)度傳感(gan)器是一(yi)種用(yong)雙金屬片制(zhi)作(zuo)的熱(re)(re)(re)敏器件，溫(wen)度低時(shi)它朝一(yi)個(ge)方(fang)向彎曲，溫(wen)度達到規定(ding)值時(shi)就(jiu)向另一(yi)個(ge)方(fang)向彎曲將電路斷開，停止加熱(re)(re)(re)。電熱(re)(re)(re)壺(hu)中就(jiu)巧妙地使用(yong)了這種傳感(gan)器。
1．電熱水壺加熱電路的工作過程
交(jiao)流(liu)220V電(dian)(dian)(dian)源(yuan)為電(dian)(dian)(dian)熱(re)水(shui)壺供電(dian)(dian)(dian)，交(jiao)流(liu)電(dian)(dian)(dian)源(yuan)的L（火線(xian)）端(duan)(duan)經(jing)熱(re)熔斷器(qi)(qi)(qi)FU加(jia)(jia)(jia)到(dao)煮(zhu)水(shui)加(jia)(jia)(jia)熱(re)器(qi)(qi)(qi)EM和(he)保溫(wen)加(jia)(jia)(jia)熱(re)器(qi)(qi)(qi)EH2的一(yi)端(duan)(duan)，交(jiao)流(liu)電(dian)(dian)(dian)源(yuan)的N（零線(xian)）端(duan)(duan)經(jing)溫(wen)控器(qi)(qi)(qi)ST加(jia)(jia)(jia)到(dao)煮(zhu)水(shui)加(jia)(jia)(jia)熱(re)器(qi)(qi)(qi)的另(ling)一(yi)端(duan)(duan)，同時交(jiao)流(liu)電(dian)(dian)(dian)源(yuan)的N（零線(xian)）端(duan)(duan)經(jing)二極管VIE℃和(he)選擇開(kai)關SA加(jia)(jia)(jia)到(dao)保溫(wen)加(jia)(jia)(jia)熱(re)器(qi)(qi)(qi)EH2的另(ling)一(yi)端(duan)(duan)。使煮(zhu)水(shui)加(jia)(jia)(jia)熱(re)器(qi)(qi)(qi)和(he)保溫(wen)加(jia)(jia)(jia)熱(re)器(qi)(qi)(qi)兩端(duan)(duan)都有交(jiao)流(liu)電(dian)(dian)(dian)壓，而(er)開(kai)始(shi)加(jia)(jia)(jia)熱(re)，如圖所(suo)示。
2．加熱控制電路的工作過程
電(dian)(dian)(dian)(dian)(dian)熱(re)(re)水壺(hu)剛(gang)開(kai)始煮(zhu)水時(shi)，溫(wen)控(kong)器(qi)(qi)ST處(chu)于低(di)溫(wen)狀態。此時(shi)，溫(wen)控(kong)器(qi)(qi)ST兩(liang)引線端(duan)(duan)之間是(shi)導通的(de)，為電(dian)(dian)(dian)(dian)(dian)源供電(dian)(dian)(dian)(dian)(dian)提(ti)供通路，此時(shi)，綠(lv)指(zhi)(zhi)示(shi)燈(deng)亮(liang)(liang)，紅(hong)(hong)指(zhi)(zhi)示(shi)燈(deng)兩(liang)端(duan)(duan)無(wu)電(dian)(dian)(dian)(dian)(dian)壓，不亮(liang)(liang)。當水瓶中(zhong)的(de)溫(wen)度超過96℃時(shi)（水開(kai)了(le)），溫(wen)度控(kong)制器(qi)(qi)ST自動斷(duan)開(kai)，停止為煮(zhu)水加(jia)(jia)熱(re)(re)器(qi)(qi)供電(dian)(dian)(dian)(dian)(dian)。此時(shi)，保(bao)溫(wen)加(jia)(jia)熱(re)(re)器(qi)(qi)兩(liang)端(duan)(duan)仍有交流220V電(dian)(dian)(dian)(dian)(dian)壓，但由于保(bao)溫(wen)加(jia)(jia)熱(re)(re)器(qi)(qi)電(dian)(dian)(dian)(dian)(dian)阻值較大所(suo)產生的(de)能量只有煮(zhu)水加(jia)(jia)熱(re)(re)器(qi)(qi)的(de)1/20，因此只起(qi)到保(bao)溫(wen)的(de)作用。此時(shi)，交流220V經(jing)EM為紅(hong)(hong)指(zhi)(zhi)示(shi)燈(deng)供電(dian)(dian)(dian)(dian)(dian)綠(lv)指(zhi)(zhi)示(shi)燈(deng)滅，紅(hong)(hong)指(zhi)(zhi)示(shi)燈(deng)亮(liang)(liang)。
如果電熱(re)水瓶中(zhong)(zhong)水的(de)溫(wen)度降低了，溫(wen)度控制(zhi)器ST又會自(zi)動接通，煮(zhu)水加熱(re)器繼續加始終(zhong)使(shi)水瓶中(zhong)(zhong)的(de)開水保持在(zai)90℃以上。
