德國(guó)(guo)HYDAC溫(wen)度(du)繼電器(qi)ETS386-3-150-000型(xing)工(gong)作時(shí)(shi)的(de)原理：
將(jiang)兩種熱膨脹(zhang)系(xi)數(shù)(shu)相差(cha)懸(xuan)殊的(de)金(jin)屬(shu)或(huo)合(he)金彼此(ci)牢固(gu)地復(fù)合(he)在壹(yi)起(qi)形成碟形雙(shuang)金屬(shu)片(pian),當(dāng)(dang)溫(wen)度(du)升高(gao)到壹(yi)定(ding)值,雙(shuang)金屬(shu)片(pian)就會(huì)由於下層金(jin)屬膨脹伸長(zhǎng)大(da),上層金(jin)屬膨脹伸長(zhǎng)小(xiao)而(er)產(chǎn)(chan)生(sheng)向上彎(wan)曲的(de)力(li),彎曲到壹(yi)定(ding)程度(du)便能(neng)帶(dai)動(dòng)(dong)電觸點(diǎn)(dian),實(shí)現(xiàn)(xian)接通或(huo)斷(duan)開(kāi)負(fù)載(zai)電路(lu)的(de)功(gong)能(neng);溫(wen)度(du)降低到壹(yi)定(ding)值,雙(shuang)金屬(shu)片(pian)逐(zhu)漸恢(hui)復(fù)原狀(zhuang),恢復(fù)到壹(yi)定(ding)程度(du)便反向帶(dai)動(dòng)(dong)電觸點(diǎn)(dian),實(shí)現(xiàn)(xian)斷(duan)開(kāi)或接通負(fù)(fu)載(zai)電路(lu)的(de)功(gong)能(neng).碟形雙(shuang)金屬(shu)片(pian)工(gong)作原理如(ru)圖1所示,初(chu)始(shi)狀(zhuang)態(tài)為(wei)1(室溫(wen)下(xia)),受(shou)熱(或冷)後(hou)跳(tiao)到狀(zhuang)態(tài)2,產(chǎn)生(sheng)位移3.
航空用的(de)德(de)國(guó)(guo)HYDAC溫(wen)度(du)繼電器(qi)與民用溫(wen)度(du)繼電器(qi)在工(gong)作原理上是(shi)基本相同(tong)的(de),但(dan)是(shi)航空工(gong)業(yè)由於工(gong)作環(huán)境苛刻、設(shè)(she)備(bei)結(jié)(jie)構(gòu)(gou)復(fù)雜(za)等(deng),對(duì)所選用(yong)的(de)器(qi)件(jian)在材(cai)料(liao)、工(gong)藝、試(shi)驗(yàn)(yan)、使用(yong)壽命等(deng)方面(mian)都(dou)有(you)著(zhe)極(ji)其嚴(yán)格(ge)的(de)要(yao)求(qiu),比(bi)如(ru)生(sheng)產(chǎn)出的(de)產(chǎn)(chan)品(pin)需要通(tong)過(guò)環(huán)境三防(fang)(濕(shi)熱、黴菌(jun)、煙(yan)霧)、振(zhen)動(dòng)(dong)(正(zheng)弦(xian)、隨(sui)機(jī)(ji))、加速(su)度(du)、沖擊(ji)、低空氣等壹(yi)系(xi)列(lie)的(de)試(shi)驗(yàn)(yan),對(duì)於(yu)產(chǎn)(chan)品(pin)的(de)壽命要(yao)求(qiu)是(shi)同機(jī)同(tong)壽命,工(gong)藝要(yao)求(qiu)進(jìn)行(xing)較(jiao)長(zhǎng)時(shí)(shi)間(jian)的(de)穩(wěn)(wen)定(ding)處理等(deng).
德(de)國(guó)HYDAC溫(wen)度(du)繼電器(qi)因周?chē)h(huán)境溫(wen)度(du)升高(gao)或(huo)自(zi)身(shen)通(tong)過(guò)的(de)電流生(sheng)熱引起溫(wen)升而(er)發(fā)(fa)生(sheng)動(dòng)(dong)作,由於繼電器(qi)的(de)接通電阻(zu)很(hen)小,因此(ci)電流熱效(xiao)應(yīng)(ying)引起的(de)溫(wen)升也很小(xiao),與環(huán)境溫(wen)度(du)溫(wen)升相比(bi)可(ke)以(yi)忽略(lve)不計(jì),所以(yi)壹(yi)般都(dou)是(shi)通過(guò)控(kong)制(zhi)環(huán)境溫(wen)度(du)的(de)變(bian)化(hua)來(lái)實(shí)現(xiàn)(xian)溫(wen)度(du)繼電器(qi)的(de)動(dòng)(dong)作溫(wen)度(du)和回復(fù)溫(wen)度(du)的(de)檢(jian)測(cè)(ce).
德(de)國(guó)HYDAC溫(wen)度(du)繼電器(qi)按照(zhao)GJB1517-92《恒(heng)溫(wen)繼(ji)電器(qi)總規(guī)範(fàn)》的(de)規(guī)定(ding),溫(wen)度(du)特性(xing)(即(ji)動(dòng)(dong)作溫(wen)度(du)和回復(fù)溫(wen)度(du))的(de)檢(jian)測(cè)(ce)有(you)三種方法可(ke)以(yi)選擇(ze),即(ji)液體(ti)測(cè)(ce)定(ding)法、空(kong)氣測(cè)(ce)定(ding)法、試(shi)塊測(cè)(ce)定(ding)法.這(zhe)三種方法各(ge)有(you)特點(diǎn)(dian),從精(jing)度(du)上看(kan),液體(ti)法最高(gao),空(kong)氣法次(ci)之,試(shi)塊法最差(cha),但(dan)從操作簡(jiǎn)單(dan)性(xing)上看(kan)卻(que)正(zheng)好相反.壹(yi)般來(lái)(lai)說(shuō)(shuo),如(ru)果是(shi)用於室(shi)溫(wen)下(xia)被(bei)控(kong)物體(ti)表(biao)面(mian)溫(wen)度(du)的(de)控(kong)制(zhi),則采(cai)用(yong)試(shi)塊法;如(ru)果被測(cè)(ce)的(de)是(shi)密封(feng)產(chǎn)(chan)品(pin)且(qie)不會(huì)受(shou)到油(you)的(de)汙染(ran),則采(cai)用(yong)液體(ti)法;如(ru)果是(shi)將(jiang)產(chǎn)品(pin)置於(yu)壹(yi)個(gè)加溫(wen)物體(ti)或(huo)封(feng)閉體(ti)的(de)內(nèi)(nei)部(bu),當(dāng)(dang)然(ran)應(yīng)(ying)該選(xuan)用空氣法.在本(ben)系(xi)統(tǒng)中(zhong),我(wo)們對(duì)待(dai)檢(jian)測(cè)(ce)產(chǎn)(chan)品(pin)的(de)實(shí)際特(te)點(diǎn)(dian)和廠(chǎng)家提出的(de)技(ji)術(shù)(shu)要(yao)求(qiu)綜(zong)合分(fen)析(xi)和充分考慮以(yi)後(hou),決定(ding)采(cai)用(yong)空(kong)氣測(cè)(ce)定(ding)法.
當(dāng)(dang)外(wai)界(jie)溫(wen)度(du)達(dá)到給定(ding)值時(shí)(shi)而(er)動(dòng)(dong)作的(de)繼(ji)電器(qi)。該產(chǎn)(chan)品(pin)為(wei)通接觸感(gan)應(yīng)(ying)式密封(feng)德(de)國(guó)HYDAC溫(wen)度(du)繼電器(qi)，具有體(ti)積(ji)小(xiao)、重量(liang)輕(qing)、控(kong)溫(wen)精(jing)度(du)高(gao)等(deng)特點(diǎn)(dian)，通用(yong)性(xing)強(qiáng)。是(shi)使用為(wei)廣(guang)泛(fan)的(de)產(chǎn)(chan)品(pin)，可(ke)供(gong)航空(kong)航天、監(jiān)(jian)控(kong)攝像設(shè)(she)備(bei)、電機(jī)、電器(qi)設(shè)(she)備(bei)及其(qi)它(ta)行(xing)業(yè)作(zuo)溫(wen)度(du)控制(zhi)和過(guò)熱保護(hù)(hu)用(yong)。
產(chǎn)品(pin)實(shí)物如(ru)下圖所示：
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