[恒溫恒濕試驗箱]恒溫恒濕(shi)試(shi)驗箱升(sheng)溫與降溫的科(ke)學原理

　　恒溫(wen)(wen)恒濕(shi)試驗(yan)箱具(ju)有加溫(wen)(wen)、降(jiang)(jiang)溫(wen)(wen)、加濕(shi)，降(jiang)(jiang)濕(shi)的功能(neng)，能(neng)夠檢測(ce)出產品耐(nai)高(gao)溫(wen)(wen)，耐(nai)低溫(wen)(wen)和抗(kang)濕(shi)度的能(neng)力。那么恒溫(wen)(wen)恒濕(shi)試驗(yan)箱內的溫(wen)(wen)度是如(ru)何控制的呢？

　　加(jia)溫裝置是控制恒溫恒濕試驗箱(xiang)是否升(sheng)(sheng)溫的(de)關鍵環節(jie)；控制器(qi)(qi)在(zai)得到(dao)(dao)升(sheng)(sheng)溫指(zhi)令時輸出(chu)電(dian)(dian)壓給繼電(dian)(dian)器(qi)(qi)，大約3-12伏直(zhi)流(liu)電(dian)(dian)加(jia)在(zai)固態繼電(dian)(dian)器(qi)(qi)上面；它的(de)交流(liu)端(duan)相(xiang)當于(yu)導線接通；接觸(chu)器(qi)(qi)也同時吸合，加(jia)熱器(qi)(qi)兩端(duan)有電(dian)(dian)壓使其發熱，通過循環風機帶動把熱量(liang)帶到(dao)(dao)箱(xiang)里，使恒溫恒濕試驗箱(xiang)升(sheng)(sheng)溫。

　　降溫是恒(heng)(heng)溫恒(heng)(heng)濕(shi)試驗箱(xiang)的(de)重(zhong)要環(huan)節，直接影響著一臺恒(heng)(heng)溫恒(heng)(heng)濕(shi)及性(xing)能好壞(huai)的(de)判定，它包括壓(ya)(ya)縮(suo)(suo)機、冷(leng)(leng)凝器(qi)、節流(liu)(liu)裝置、蒸(zheng)(zheng)發(fa)(fa)器(qi)四大組(zu)成(cheng)。壓(ya)(ya)縮(suo)(suo)機是制冷(leng)(leng)系(xi)統心臟，它吸入(ru)低(di)(di)溫低(di)(di)壓(ya)(ya)氣(qi)體，變成(cheng)高(gao)(gao)溫高(gao)(gao)壓(ya)(ya)氣(qi)體，通(tong)過冷(leng)(leng)凝成(cheng)液體放出熱量(liang)，通(tong)過風(feng)機帶(dai)走熱量(liang)，所(suo)以試驗箱(xiang)下面是熱風(feng)原因，然后通(tong)過節流(liu)(liu)成(cheng)為低(di)(di)壓(ya)(ya)液體，其次通(tong)過蒸(zheng)(zheng)發(fa)(fa)器(qi)成(cheng)為低(di)(di)溫低(di)(di)壓(ya)(ya)氣(qi)體最后回到壓(ya)(ya)縮(suo)(suo)機；制冷(leng)(leng)劑在(zai)蒸(zheng)(zheng)發(fa)(fa)器(qi)中吸收(shou)熱量(liang)完成(cheng)氣(qi)化過程重(zhong)而吸收(shou)熱量(liang)，達到制冷(leng)(leng)目的(de)，完成(cheng)恒(heng)(heng)溫恒(heng)(heng)濕(shi)試驗箱(xiang)降溫過程。

　　溫恒濕箱(xiang)升溫及(ji)降溫速率測試程序：

　　在試(shi)驗箱溫(wen)(wen)度(du)可調范圍內，選取最(zui)低標(biao)稱溫(wen)(wen)度(du)為最(zui)低降(jiang)溫(wen)(wen)溫(wen)(wen)度(du)，最(zui)高(gao)標(biao)稱溫(wen)(wen)度(du)為最(zui)高(gao)升溫(wen)(wen)溫(wen)(wen)度(du)。

　　開啟冷源(yuan)，使(shi)試(shi)驗(yan)箱由室溫降(jiang)到(dao)(dao)最低降(jiang)溫溫度(du)，至少穩定3h后，升到(dao)(dao)最高升溫溫度(du)，至少穩定3h后再降(jiang)到(dao)(dao)最低降(jiang)溫溫度(du)。升溫和降(jiang)溫期間，每分鐘(zhong)記錄1次(ci)，直到(dao)(dao)試(shi)驗(yan)過(guo)程(cheng)結束。

　　恒(heng)(heng)溫恒(heng)(heng)濕試驗(yan)箱升溫、降溫原理(li)便是(shi)如此，其功能的實現(xian)是(shi)通過(guo)控制系統的設置來完成的。了解了升溫、降溫的原理(li)，在使用恒(heng)(heng)溫恒(heng)(heng)濕試驗(yan)箱時一定(ding)能更得(de)心應手。

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