[恒溫恒濕試驗箱]怎樣控制恒溫恒濕試驗箱的溫度
[恒溫恒濕試驗箱]怎樣控制恒溫恒濕(shi)試(shi)驗箱(xiang)的(de)溫度(du)
恒溫恒濕(shi)試(shi)驗(yan)箱是(shi)如何(he)來(lai)實現溫、降溫、加濕(shi),降濕(shi)的呢(ni)?
恒(heng)(heng)溫(wen)(wen)恒(heng)(heng)濕(shi)(shi)試驗(yan)箱(xiang)擁有加(jia)溫(wen)(wen)、降溫(wen)(wen)、加(jia)濕(shi)(shi),降濕(shi)(shi)的(de)功(gong)能,因此(ci)完美準確地模擬出了自然(ran)界(jie)復雜的(de)低(di)溫(wen)(wen)、高(gao)溫(wen)(wen)、高(gao)溫(wen)(wen)高(gao)濕(shi)(shi)、低(di)溫(wen)(wen)低(di)濕(shi)(shi)環境。通常塑膠、電子、食品、服(fu)裝、車輛、金屬(shu)、化學、建材等多種行業用恒(heng)(heng)溫(wen)(wen)恒(heng)(heng)濕(shi)(shi)試驗(yan)箱(xiang)來(lai)(lai)檢驗(yan)產品耐高(gao)溫(wen)(wen),耐低(di)溫(wen)(wen)和抗濕(shi)(shi)度的(de)能力;試驗(yan)室和研究(jiu)所可以用恒(heng)(heng)溫(wen)(wen)恒(heng)(heng)濕(shi)(shi)試驗(yan)箱(xiang)來(lai)(lai)檢驗(yan)并設計出新(xin)型(xing)產品。那么恒(heng)(heng)溫(wen)(wen)恒(heng)(heng)濕(shi)(shi)試驗(yan)箱(xiang)是(shi)如何(he)實(shi)現(xian)這4大(da)功(gong)能的(de)呢?
為了更清晰明白地講明這個工作原理(li),我(wo)們將分(fen)為兩個部分(fen)進行闡(chan)述:
一、溫濕度系統系統
1、制冷系統
制(zhi)冷(leng)系統是(shi)恒(heng)溫恒(heng)濕試驗(yan)箱中(zhong)的(de)關鍵(jian)部件之一,是(shi)整個(ge)設計的(de)重點(dian)和難點(dian),其設計質量好(hao)壞直接影響(xiang)試驗(yan)箱的(de)性能優劣。我公司常用(yong)制(zhi)冷(leng)方(fang)式是(shi)機械制(zhi)冷(leng),即蒸氣壓(ya)縮機制(zhi)冷(leng);采(cai)用(yong)了(le)最成熟的(de)制(zhi)冷(leng)技術(shu),確保制(zhi)冷(leng)性能穩定,根據用(yong)戶(hu)對恒(heng)溫恒(heng)濕試驗(yan)箱低(di)溫程度要求的(de)不(bu)同,可(ke)以(yi)分(fen)別采(cai)取單級制(zhi)冷(leng)、雙級制(zhi)冷(leng)和復疊式制(zhi)冷(leng)。其制(zhi)冷(leng)原理都是(shi)一樣(yang)的(de)。
制冷(leng)系(xi)統(tong)由壓(ya)(ya)(ya)縮(suo)機、冷(leng)凝器(qi)、節(jie)(jie)流(liu)裝置、蒸(zheng)(zheng)發器(qi)四大組成(cheng)。壓(ya)(ya)(ya)縮(suo)機是(shi)制冷(leng)系(xi)統(tong)心臟,它吸(xi)入低溫低壓(ya)(ya)(ya)氣(qi)(qi)體(ti),變成(cheng)高溫高壓(ya)(ya)(ya)氣(qi)(qi)體(ti),通(tong)(tong)過(guo)冷(leng)凝成(cheng)液體(ti)放出熱(re)量(liang)(liang),通(tong)(tong)過(guo)風機帶(dai)走熱(re)量(liang)(liang),所以(yi)試驗箱下(xia)面是(shi)熱(re)風原(yuan)因,然后通(tong)(tong)過(guo)節(jie)(jie)流(liu)成(cheng)為低壓(ya)(ya)(ya)液體(ti),其(qi)次通(tong)(tong)過(guo)蒸(zheng)(zheng)發器(qi)成(cheng)為低溫低壓(ya)(ya)(ya)氣(qi)(qi)體(ti)最后回到壓(ya)(ya)(ya)縮(suo)機;制冷(leng)劑(ji)在蒸(zheng)(zheng)發器(qi)中(zhong)吸(xi)收(shou)(shou)熱(re)量(liang)(liang)完(wan)成(cheng)氣(qi)(qi)化過(guo)程(cheng)重而吸(xi)收(shou)(shou)熱(re)量(liang)(liang),這個過(guo)程(cheng)不斷(duan)循環,不斷(duan)地(di)與四周(zhou)介質進行熱(re)交換將(jiang)熱(re)量(liang)(liang)傳給四周(zhou)介質,達到制冷(leng)目的,完(wan)成(cheng)恒溫恒濕(shi)試驗箱降(jiang)溫過(guo)程(cheng)。
2、加溫系統
加(jia)溫原(yuan)理很(hen)簡單,鎳鉻合(he)金不銹管加(jia)熱器兩端有電壓,可以通過控制器使(shi)其加(jia)熱,最后通過熱風循環把熱量帶(dai)到箱(xiang)里,使(shi)恒(heng)溫恒(heng)濕試驗箱(xiang)升溫。
3、加濕系統
恒溫(wen)恒濕(shi)(shi)試(shi)驗(yan)箱(xiang)的加(jia)(jia)濕(shi)(shi)方式一般采用蒸汽加(jia)(jia)濕(shi)(shi)法,即將(jiang)低壓蒸汽直接注入試(shi)驗(yan)空間加(jia)(jia)濕(shi)(shi).這種(zhong)加(jia)(jia)濕(shi)(shi)方法加(jia)(jia)濕(shi)(shi)能力,速度(du)快,加(jia)(jia)濕(shi)(shi)控制(zhi)靈敏(min),尤其在降溫(wen)時可以輕易實(shi)現強制(zhi)加(jia)(jia)濕(shi)(shi)。
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