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恒溫(wen)恒濕箱是一種專門模仿應用環境的儀器，適用于電子電器、通訊、化工、五金、橡膠、玩具、航天、航空等各種行業的產品、零件的測試。恒溫恒濕試驗箱是產品放在規定的溫度及濕度，看產品的耐高溫，耐低溫，以及抗濕度能力，那么恒溫恒濕試驗箱如何同時具備加溫，降溫，加濕，降濕能力？

加(jia)(jia)溫(wen)(wen)(wen)(wen)(wen)(wen)裝置是控(kong)制(zhi)恒(heng)(heng)(heng)溫(wen)(wen)(wen)(wen)(wen)(wen)恒(heng)(heng)(heng)濕(shi)實(shi)驗(yan)(yan)箱(xiang)是不是升(sheng)(sheng)溫(wen)(wen)(wen)(wen)(wen)(wen)關鍵環節。它是控(kong)制(zhi)器(qi)得到(dao)升(sheng)(sheng)溫(wen)(wen)(wen)(wen)(wen)(wen)指令時會(hui)輸出(chu)電(dian)(dian)(dian)(dian)壓給繼(ji)(ji)電(dian)(dian)(dian)(dian)器(qi)，大約3-12伏直流(liu)電(dian)(dian)(dian)(dian)加(jia)(jia)在固(gu)(gu)(gu)態(tai)(tai)繼(ji)(ji)電(dian)(dian)(dian)(dian)器(qi)上面；它的(de)交流(liu)端相(xiang)當于導線(xian)接通(tong)(tong)(tong)；接觸器(qi)也同時吸合，加(jia)(jia)熱器(qi)兩(liang)端有(you)電(dian)(dian)(dian)(dian)壓使其發(fa)熱，通(tong)(tong)(tong)過(guo)(guo)循環風(feng)機(ji)(ji)帶動把熱量(liang)帶到(dao)箱(xiang)里，使恒(heng)(heng)(heng)溫(wen)(wen)(wen)(wen)(wen)(wen)恒(heng)(heng)(heng)濕(shi)機(ji)(ji)升(sheng)(sheng)溫(wen)(wen)(wen)(wen)(wen)(wen)，那溫(wen)(wen)(wen)(wen)(wen)(wen)度(du)快(kuai)達到(dao)你的(de)設定值；控(kong)制(zhi)器(qi)通(tong)(tong)(tong)過(guo)(guo)加(jia)(jia)在固(gu)(gu)(gu)態(tai)(tai)繼(ji)(ji)電(dian)(dian)(dian)(dian)器(qi)通(tong)(tong)(tong)斷調節；我們在恒(heng)(heng)(heng)溫(wen)(wen)(wen)(wen)(wen)(wen)恒(heng)(heng)(heng)濕(shi)試驗(yan)(yan)箱(xiang)看屏幕上加(jia)(jia)熱出(chu)力多少(shao)來(lai)調節發(fa)熱量(liang)；這是在89度(du)以(yi)上溫(wen)(wen)(wen)(wen)(wen)(wen)度(du)控(kong)制(zhi)，在89度(du)以(yi)下溫(wen)(wen)(wen)(wen)(wen)(wen)度(du)穩定如(ru)何控(kong)制(zhi)呢(ni)？恒(heng)(heng)(heng)溫(wen)(wen)(wen)(wen)(wen)(wen)恒(heng)(heng)(heng)濕(shi)試驗(yan)(yan)箱(xiang)是在一邊通(tong)(tong)(tong)過(guo)(guo)固(gu)(gu)(gu)態(tai)(tai)繼(ji)(ji)電(dian)(dian)(dian)(dian)器(qi)發(fa)熱出(chu)力多少(shao)；另通(tong)(tong)(tong)過(guo)(guo)壓縮機(ji)(ji)制(zhi)冷循環降溫(wen)(wen)(wen)(wen)(wen)(wen)達到(dao)動態(tai)(tai)平衡(heng)；溫(wen)(wen)(wen)(wen)(wen)(wen)度(du)恒(heng)(heng)(heng)定。

降溫(wen)(wen)(wen)(wen)(wen)是(shi)恒溫(wen)(wen)(wen)(wen)(wen)恒濕(shi)機重要(yao)環(huan)節(jie)，是(shi)判(pan)定一臺恒溫(wen)(wen)(wen)(wen)(wen)恒濕(shi)機性能好壞重要(yao)參數，它包括壓(ya)(ya)縮機、冷(leng)凝器(qi)(qi)、節(jie)流裝置(zhi)、蒸發(fa)器(qi)(qi)四(si)大組成(cheng)(cheng)(cheng)(cheng)。壓(ya)(ya)縮機是(shi)制(zhi)冷(leng)系統心(xin)臟，它吸(xi)入(ru)低(di)溫(wen)(wen)(wen)(wen)(wen)低(di)壓(ya)(ya)氣(qi)體，變成(cheng)(cheng)(cheng)(cheng)高溫(wen)(wen)(wen)(wen)(wen)高壓(ya)(ya)氣(qi)體，通過冷(leng)凝成(cheng)(cheng)(cheng)(cheng)液體放(fang)出(chu)熱量，通過風機帶走熱量，所以(yi)恒溫(wen)(wen)(wen)(wen)(wen)恒濕(shi)試驗(yan)箱(xiang)(xiang)下面(mian)是(shi)熱風原因，然后(hou)通過節(jie)流到為低(di)壓(ya)(ya)液體，其次通過蒸發(fa)器(qi)(qi)成(cheng)(cheng)(cheng)(cheng)為低(di)溫(wen)(wen)(wen)(wen)(wen)低(di)壓(ya)(ya)氣(qi)體zui后(hou)回到壓(ya)(ya)縮機；制(zhi)冷(leng)劑在(zai)蒸發(fa)器(qi)(qi)中吸(xi)收熱量完成(cheng)(cheng)(cheng)(cheng)氣(qi)化過程重而吸(xi)收熱量，達(da)到制(zhi)冷(leng)目的，完成(cheng)(cheng)(cheng)(cheng)恒溫(wen)(wen)(wen)(wen)(wen)恒濕(shi)試驗(yan)箱(xiang)(xiang)降溫(wen)(wen)(wen)(wen)(wen)過程。

恒溫恒濕(shi)試驗(yan)箱常見有以(yi)下四種加濕(shi)方式(shi)。

1、超(chao)聲波加濕：比較(jiao)常(chang)見，成本也較(jiao)低。在恒溫恒濕試驗箱箱體側面開孔(kong)，用超(chao)聲波加濕器(qi)將(jiang)水霧(wu)化，將(jiang)霧(wu)通過水管(guan)導入箱內即可。特(te)點是加濕速度快(kuai)，也容易造成儀器(qi)頻繁啟動除濕，耗水比較(jiao)大。

2、淺(qian)冰盤(pan)加(jia)濕：恒溫恒濕試驗箱(xiang)箱(xiang)體內(nei)有一淺(qian)水(shui)(shui)盤(pan)，內(nei)有電加(jia)熱(re)棒,通過將水(shui)(shui)加(jia)熱(re)，使水(shui)(shui)蒸發而加(jia)濕。特點(dian)是加(jia)濕速度較慢，但穩定以后濕度變(bian)化(hua)很小。

3、蒸汽鍋加(jia)(jia)濕(shi)(shi)(shi)：通過將水加(jia)(jia)熱到沸(fei)騰產生(sheng)蒸汽，通入箱體內加(jia)(jia)濕(shi)(shi)(shi)。特(te)點是(shi)濕(shi)(shi)(shi)度變化較(jiao)快，但結構比較(jiao)復(fu)雜(za)，故障率(lv)稍高。

4、淋水(shui)加(jia)濕(shi)：向(xiang)恒溫恒濕(shi)試(shi)驗箱工作室內壁噴(pen)淋水(shui)，箱壁著水(shui)面(mian)積增(zeng)(zeng)大(da)，水(shui)在向(xiang)箱內擴散的時候增(zeng)(zeng)加(jia)箱體內的水(shui)氣壓從而增(zeng)(zeng)加(jia)相對濕(shi)度。特點(dian)是系統穩(wen)定(ding)后，濕(shi)度波動小，但(dan)是噴(pen)水(shui)時，水(shui)會可(ke)能污(wu)染試(shi)件(jian)。