高低溫交變濕熱試驗箱是一(yi)種(zhong)集高溫(wen)試(shi)驗、低溫(wen)試(shi)驗、高低溫(wen)循環試(shi)驗、濕(shi)度為一(yi)體的模擬環境試(shi)驗設備,常規的溫(wen)度范圍有(you)0℃~+150℃ -20℃~+150℃ -40℃~+150℃ -70℃~+150℃,其中(zhong)zui為復(fu)雜的當屬-70℃~+150℃。
為什么說(shuo)zui為復(fu)雜的當屬-70℃~+150℃這個溫(wen)(wen)度(du)范(fan)圍呢,首先不說(shuo)高溫(wen)(wen)150度(du),因為高溫(wen)(wen)相對低溫(wen)(wen)比(bi)較容易控制(zhi);0℃~-40℃低溫(wen)(wen)一(yi)般采(cai)用一(yi)臺壓縮機(ji)(ji)即(ji)可(ke)滿(man)足,也就(jiu)是單(dan)級(ji)制(zhi)冷;而-70℃低溫(wen)(wen)時必(bi)須使用兩(liang)臺壓縮機(ji)(ji)同時工作(zuo)才能滿(man)足,也就(jiu)是復(fu)疊式制(zhi)冷。
-70度高低溫交變濕熱試驗箱多采用復疊式(shi)制(zhi)(zhi)冷(leng),分(fen)(fen)別分(fen)(fen)為高(gao)溫部分(fen)(fen)和低溫部分(fen)(fen),高(gao)溫部分(fen)(fen)多采用制(zhi)(zhi)冷(leng)R404A或者(zhe)R507A中溫制(zhi)(zhi)冷(leng)劑,低溫部分(fen)(fen)多采用R23A做(zuo)低溫制(zhi)(zhi)冷(leng)劑,高(gao)溫部分(fen)(fen)和低溫部分(fen)(fen)是兩套*獨立(li)的制(zhi)(zhi)冷(leng)系統,但彼此又是緊密配合。
當用戶設定高低溫交變濕熱試驗箱溫(wen)(wen)度(du)(du)為-70度(du)(du)時,控制(zhi)器(qi)(qi)(qi)會輸出指令給接觸器(qi)(qi)(qi),啟動R404A系(xi)統(tong)的(de)(de)(de)壓(ya)(ya)(ya)縮(suo)機(ji)(ji)(ji)(ji),壓(ya)(ya)(ya)縮(suo)機(ji)(ji)(ji)(ji)排(pai)出高(gao)溫(wen)(wen)高(gao)壓(ya)(ya)(ya)的(de)(de)(de)氣體經(jing)過冷(leng)(leng)凝(ning)(ning)器(qi)(qi)(qi)、干(gan)燥過濾器(qi)(qi)(qi)、毛線管等裝(zhuang)置zui終(zhong)進入蒸發冷(leng)(leng)凝(ning)(ning)器(qi)(qi)(qi),也就是我們(men)通常所說(shuo)的(de)(de)(de)板式熱(re)交換器(qi)(qi)(qi);為啟動R23冷(leng)(leng)卻做準備,zui后回到低溫(wen)(wen)部分R404A壓(ya)(ya)(ya)縮(suo)機(ji)(ji)(ji)(ji),如此反復(fu)循(xun)環。隨后當R404系(xi)統(tong)正常運轉數分鐘之(zhi)后,R23系(xi)統(tong)的(de)(de)(de)壓(ya)(ya)(ya)縮(suo)機(ji)(ji)(ji)(ji)啟動,壓(ya)(ya)(ya)縮(suo)機(ji)(ji)(ji)(ji)排(pai)出高(gao)溫(wen)(wen)高(gao)壓(ya)(ya)(ya)氣體經(jing)過蒸發冷(leng)(leng)凝(ning)(ning)器(qi)(qi)(qi)即板式熱(re)交換器(qi)(qi)(qi),經(jing)毛細管節流降(jiang)壓(ya)(ya)(ya)形成(cheng)低溫(wen)(wen)低壓(ya)(ya)(ya)液態制(zhi)冷(leng)(leng)劑,zui后進入工(gong)(gong)作室(shi)內箱安裝(zhuang)的(de)(de)(de)蒸發器(qi)(qi)(qi)里面,通過蒸發吸熱(re)的(de)(de)(de)原理和循(xun)環馬達(da)不(bu)斷(duan)強(qiang)制(zhi)循(xun)環工(gong)(gong)作室(shi)氣流,帶(dai)走工(gong)(gong)作室(shi)的(de)(de)(de)熱(re)量達(da)到降(jiang)溫(wen)(wen)目(mu)的(de)(de)(de)。zui后要(yao)重點說(shuo)下的(de)(de)(de)是蒸發冷(leng)(leng)凝(ning)(ning)器(qi)(qi)(qi),它既充當著一級(ji)(ji)R404系(xi)統(tong)的(de)(de)(de)蒸發器(qi)(qi)(qi),同時兼備著二級(ji)(ji)R23系(xi)統(tong)的(de)(de)(de)冷(leng)(leng)凝(ning)(ning)器(qi)(qi)(qi),屬于-70度(du)(du)高(gao)低溫(wen)(wen)試驗(yan)箱制(zhi)冷(leng)(leng)系(xi)統(tong)中的(de)(de)(de)一個比較核心的(de)(de)(de)配件(jian)。
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湖北省武漢市經(jing)濟技(ji)術開發區東風大道楓樹產業園A區一(yi)樓廠房