恒溫恒濕試驗箱加濕除濕的方法及注意要領
瀏覽： 時間：2018.03.19 來源：東莞市恒工設備有限公司
加(jia)濕(shi)的(de)過程(cheng)(cheng)實(shi)際(ji)上(shang)(shang)就(jiu)是(shi)提高(gao)水汽分壓(ya)(ya)力，最初的(de)加(jia)濕(shi)方(fang)式(shi)就(jiu)是(shi)向(xiang)試驗(yan)箱壁(bi)噴淋水，通過控(kong)制水溫使(shi)水表面(mian)飽和(he)壓(ya)(ya)力得到控(kong)制，箱壁(bi)表面(mian)的(de)水次年工程(cheng)(cheng)較(jiao)大的(de)面(mian)，在這個面(mian)上(shang)(shang)通過擴(kuo)散(san)的(de)方(fang)式(shi)向(xiang)箱內加(jia)入水汽壓(ya)(ya)使(shi)試驗(yan)箱中相對(dui)濕(shi)度(du)升高(gao)。這種(zhong)方(fang)式(shi)的(de)加(jia)濕(shi)系統穩定后濕(shi)度(du)波動性較(jiao)小，比(bi)較(jiao)適合恒定濕(shi)熱試驗(yan)，但是(shi)這種(zhong)方(fang)式(shi)已不(bu)能滿(man)足(zu)加(jia)濕(shi)量的(de)要求，并且會(hui)對(dui)試驗(yan)品造成(cheng)不(bu)同程(cheng)(cheng)度(du)的(de)污染。
恒溫恒濕試驗箱(xiang)加濕除濕的(de)方法及注意要領
恒(heng)溫恒(heng)濕(shi)(shi)試(shi)驗箱(xiang)第二種加濕(shi)(shi)方(fang)式是采用蒸(zheng)汽(qi)加濕(shi)(shi)具有加濕(shi)(shi)快，能適應交(jiao)變濕(shi)(shi)熱(re)(re)(re)試(shi)驗在(zai)升(sheng)溫段(duan)對加濕(shi)(shi)量(liang)大(da)的(de)需求(qiu)。缺點是向箱(xiang)內(nei)引入(ru)了(le)(le)過(guo)熱(re)(re)(re)蒸(zheng)汽(qi)，增加了(le)(le)箱(xiang)內(nei)的(de)熱(re)(re)(re)量(liang)。
恒(heng)溫恒(heng)濕(shi)試驗箱供水(shui)條件采用純凈水(shui)，蒸(zheng)餾水(shui)或去離子水(shui)：
1、因為用水(shui)(shui)加(jia)濕(shi)粒子比較大，如(ru)果長時間對濕(shi)度有(you)要求，那么對濕(shi)度傳感器(qi)的使(shi)用壽命會有(you)影(ying)響，但是他們的PCB板有(you)些(xie)線路(lu)沒有(you)用隔(ge)水(shui)(shui)材料(liao)或(huo)是防(fang)氧化(hua)材料(liao)做，如(ru)果水(shui)(shui)質差會造成濕(shi)度傳感器(qi)短路(lu)
2、恒溫恒濕試(shi)驗箱加濕器(qi)都有個水(shui)位(wei)(wei)開(kai)關，水(shui)位(wei)(wei)開(kai)關的浮子(zi)(zi)中間(jian)為磁力棒，浮子(zi)(zi)不是(shi)防氧化材料做(zuo)的，一旦使用時間(jian)一久(jiu)，或(huo)者不經常換水(shui)就會導致水(shui)位(wei)(wei)開(kai)關短(duan)路，造成無法加濕或(huo)者一直加濕的現(xian)象。
除濕(shi)方式：機械制冷除濕(shi)和干燥(zao)除濕(shi)。
1、恒溫恒濕(shi)試驗箱(xiang)機械制冷除濕(shi)的除濕(shi)原理是將空氣冷卻到露點(dian)溫度(du)以下，使(shi)大于飽和含(han)濕(shi)量(liang)的水汽凝結析(xi)出，這(zhe)樣就(jiu)降低了濕(shi)度(du)。這(zhe)種方(fang)式是目(mu)前經常用到的除濕(shi)方(fang)法(fa)。
2、干燥器除濕(shi)(shi)(shi)是(shi)利用氣(qi)(qi)(qi)(qi)泵將(jiang)試(shi)驗(yan)箱(xiang)內(nei)的(de)(de)空(kong)氣(qi)(qi)(qi)(qi)抽出，并將(jiang)干燥的(de)(de)空(kong)氣(qi)(qi)(qi)(qi)注入，同時將(jiang)濕(shi)(shi)(shi)空(kong)氣(qi)(qi)(qi)(qi)送入可循環利用的(de)(de)干燥進(jin)行(xing)干燥，干燥完成后又送入試(shi)驗(yan)箱(xiang)內(nei)，如此反復循環進(jin)行(xing)除濕(shi)(shi)(shi)。但(dan)是(shi)這種方式(shi)需要加除濕(shi)(shi)(shi)器或化學除濕(shi)(shi)(shi)適用于(yu)有特(te)殊要求(qiu)的(de)(de)場合，但(dan)是(shi)成本較(jiao)高，所(suo)以選擇較(jiao)少(shao)。
對于加濕(shi)槽(cao)的處理方式(shi)：
1、定時清潔水箱，以免結水垢，導致加濕異常。檢查(cha)自(zi)動加水是(shi)否(fou)流(liu)暢。
2、箱內保持(chi)清潔(jie)，不要有義務堵(du)塞(sai)回水口，以免實驗時導致(zhi)設備積水。
3、加濕(shi)(shi)槽每月清理，檢查進水是(shi)否暢通(tong)，避(bi)免干(gan)燒(shao)損壞加濕(shi)(shi)管(guan)。
4、每三(san)個月更(geng)換濕布。
選擇恒溫(wen)恒濕試(shi)驗箱(xiang)的幾種方法(fa)
一、容(rong)積的選(xuan)擇
將被(bei)試(shi)產品（元器(qi)件(jian)、組件(jian)、部件(jian)或整機）置入(ru)氣候環境箱進行試(shi)驗時(shi)，為(wei)了保(bao)證被(bei)試(shi)產品周圍氣氛能滿足試(shi)驗規范所規定的條件(jian)，氣候箱工(gong)作尺寸與被(bei)試(shi)產品外廓尺寸之間應遵循以下(xia)幾(ji)點規定：
1.被試(shi)產品的(de)體積（W×D×H）不得超過試(shi)驗(yan)(yan)箱有(you)效工作空(kong)間(jian)的(de)（20～35）％（推(tui)薦選用(yong)20％）。對于(yu)在試(shi)驗(yan)(yan)中(zhong)發熱(re)的(de)產品推(tui)薦選用(yong)不大于(yu)10％。
; 2.被試產品的(de)迎風斷面(mian)積與該斷面(mian)上試驗(yan)箱(xiang)工(gong)作室總面(mian)積之比不大于（35～50）％（推(tui)薦(jian)選用35％）。
3.被試(shi)(shi)產品外廓表面距(ju)試(shi)(shi)驗(yan)箱壁的(de)距(ju)離至少保持100～150mm，（推薦選用150mm）。
上述三(san)(san)點(dian)規(gui)定實際(ji)上是相(xiang)互(hu)依存和統一的。以1立方米正方體箱子為例，面積(ji)比(bi)為1：（0.35～0.5）相(xiang)當(dang)于(yu)體積(ji)之(zhi)比(bi)為1：（0.207～0.354）。距箱壁100～150mm相(xiang)當(dang)于(yu)體積(ji)之(zhi)比(bi)為1：（0.343～0.512）。總括上述三(san)(san)點(dian)規(gui)定，氣候箱的工作(zuo)腔容(rong)積(ji)至少(shao)應是被(bei)試產(chan)品(pin)外廓體積(ji)的3～5倍。
作出這種規定(ding)(ding)(ding)的(de)(de)理由是因為被(bei)試(shi)(shi)驗(yan)(yan)件(jian)(jian)(jian)置入箱(xiang)體后(hou)擠占了(le)流(liu)暢(chang)的(de)(de)通(tong)道(dao)，通(tong)道(dao)變窄將(jiang)導(dao)致氣(qi)流(liu)流(liu)速(su)(su)(su)的(de)(de)增(zeng)加(jia)。加(jia)速(su)(su)(su)氣(qi)流(liu)與(yu)被(bei)試(shi)(shi)驗(yan)(yan)件(jian)(jian)(jian)之間的(de)(de)熱(re)交換。這與(yu)環境條件(jian)(jian)(jian)的(de)(de)再現(xian)不(bu)(bu)(bu)符，因為在(zai)有關標準(zhun)中對涉及(ji)(ji)溫度都規定(ding)(ding)(ding)試(shi)(shi)驗(yan)(yan)箱(xiang)內(nei)試(shi)(shi)驗(yan)(yan)樣件(jian)(jian)(jian)周圍的(de)(de)空(kong)氣(qi)流(liu)速(su)(su)(su)不(bu)(bu)(bu)應超(chao)(chao)過1.7m/s，以防止試(shi)(shi)驗(yan)(yan)樣件(jian)(jian)(jian)和周圍氣(qi)氛產生不(bu)(bu)(bu)符合實際(ji)的(de)(de)熱(re)傳導(dao)。在(zai)空(kong)載(zai)時試(shi)(shi)驗(yan)(yan)箱(xiang)內(nei)平均風速(su)(su)(su)為0.6～0.8m/s，不(bu)(bu)(bu)超(chao)(chao)過1m/s，滿足a）、b）兩點要求(qiu)所規定(ding)(ding)(ding)的(de)(de)空(kong)間及(ji)(ji)面(mian)積(ji)比時，流(liu)場的(de)(de)風速(su)(su)(su)可能增(zeng)大（50～100）％，平均最(zui)高(gao)風速(su)(su)(su)為（1～1.7）m/s。滿足標準(zhun)規定(ding)(ding)(ding)的(de)(de)要求(qiu)。如果在(zai)試(shi)(shi)驗(yan)(yan)中不(bu)(bu)(bu)加(jia)限制地加(jia)大試(shi)(shi)驗(yan)(yan)件(jian)(jian)(jian)的(de)(de)體積(ji)或迎(ying)風斷(duan)面(mian)積(ji)，則實際(ji)試(shi)(shi)驗(yan)(yan)時氣(qi)流(liu)風速(su)(su)(su)將(jiang)增(zeng)大到超(chao)(chao)出試(shi)(shi)驗(yan)(yan)標準(zhun)所規定(ding)(ding)(ding)的(de)(de)最(zui)高(gao)風速(su)(su)(su)，其試(shi)(shi)驗(yan)(yan)結果的(de)(de)有效性將(jiang)受到懷疑。
二、濕度范圍的選擇
國(guo)內(nei)(nei)(nei)(nei)(nei)外箱給(gei)出的(de)(de)(de)濕(shi)(shi)(shi)(shi)(shi)(shi)(shi)度(du)(du)(du)指標大都是(shi)(shi)20～98％RH或30～98％RH，如(ru)(ru)果(guo)濕(shi)(shi)(shi)(shi)(shi)(shi)(shi)熱試驗(yan)箱沒有除(chu)濕(shi)(shi)(shi)(shi)(shi)(shi)(shi)系統(tong)，則濕(shi)(shi)(shi)(shi)(shi)(shi)(shi)度(du)(du)(du)范(fan)圍(wei)為60～98％，這(zhe)一(yi)類試驗(yan)箱只(zhi)能做(zuo)高濕(shi)(shi)(shi)(shi)(shi)(shi)(shi)試驗(yan)，但(dan)它的(de)(de)(de)價格低(di)得(de)(de)多(duo)。值得(de)(de)注(zhu)意的(de)(de)(de)是(shi)(shi)在(zai)(zai)濕(shi)(shi)(shi)(shi)(shi)(shi)(shi)度(du)(du)(du)指標后面應(ying)(ying)該注(zhu)明(ming)相(xiang)應(ying)(ying)的(de)(de)(de)溫(wen)(wen)(wen)度(du)(du)(du)范(fan)圍(wei)，或給(gei)出最低(di)露(lu)點(dian)(dian)(dian)(dian)溫(wen)(wen)(wen)度(du)(du)(du)。因(yin)為相(xiang)對(dui)(dui)(dui)(dui)濕(shi)(shi)(shi)(shi)(shi)(shi)(shi)度(du)(du)(du)是(shi)(shi)與溫(wen)(wen)(wen)度(du)(du)(du)直接(jie)(jie)相(xiang)關(guan)的(de)(de)(de)，對(dui)(dui)(dui)(dui)于同(tong)樣的(de)(de)(de)絕對(dui)(dui)(dui)(dui)含濕(shi)(shi)(shi)(shi)(shi)(shi)(shi)量，溫(wen)(wen)(wen)度(du)(du)(du)越高，相(xiang)對(dui)(dui)(dui)(dui)濕(shi)(shi)(shi)(shi)(shi)(shi)(shi)度(du)(du)(du)就越小，如(ru)(ru)絕對(dui)(dui)(dui)(dui)含濕(shi)(shi)(shi)(shi)(shi)(shi)(shi)量為5g/Kg（指1公斤干空(kong)(kong)氣(qi)中(zhong)(zhong)含有5克的(de)(de)(de)水(shui)蒸(zheng)汽），當溫(wen)(wen)(wen)度(du)(du)(du)為29℃時(shi)(shi)(shi)(shi)，相(xiang)對(dui)(dui)(dui)(dui)濕(shi)(shi)(shi)(shi)(shi)(shi)(shi)度(du)(du)(du)為20％RH，溫(wen)(wen)(wen)度(du)(du)(du)為6℃時(shi)(shi)(shi)(shi)，相(xiang)對(dui)(dui)(dui)(dui)濕(shi)(shi)(shi)(shi)(shi)(shi)(shi)度(du)(du)(du)為90％RH，當溫(wen)(wen)(wen)度(du)(du)(du)降至4℃以下，相(xiang)對(dui)(dui)(dui)(dui)濕(shi)(shi)(shi)(shi)(shi)(shi)(shi)度(du)(du)(du)超過100％，在(zai)(zai)箱體(ti)內(nei)(nei)(nei)(nei)(nei)會(hui)出現結露(lu)現象。實現高溫(wen)(wen)(wen)、高濕(shi)(shi)(shi)(shi)(shi)(shi)(shi)只(zhi)需要往箱體(ti)空(kong)(kong)氣(qi)中(zhong)(zhong)噴水(shui)蒸(zheng)汽或霧化(hua)的(de)(de)(de)水(shui)珠，進(jin)行加濕(shi)(shi)(shi)(shi)(shi)(shi)(shi)。低(di)溫(wen)(wen)(wen)低(di)濕(shi)(shi)(shi)(shi)(shi)(shi)(shi)則相(xiang)對(dui)(dui)(dui)(dui)難(nan)(nan)于控制，因(yin)為此(ci)時(shi)(shi)(shi)(shi)的(de)(de)(de)絕對(dui)(dui)(dui)(dui)含濕(shi)(shi)(shi)(shi)(shi)(shi)(shi)量很(hen)低(di)，有時(shi)(shi)(shi)(shi)比大氣(qi)中(zhong)(zhong)的(de)(de)(de)絕對(dui)(dui)(dui)(dui)含濕(shi)(shi)(shi)(shi)(shi)(shi)(shi)量低(di)很(hen)多(duo)，需要對(dui)(dui)(dui)(dui)箱體(ti)內(nei)(nei)(nei)(nei)(nei)流動的(de)(de)(de)空(kong)(kong)氣(qi)除(chu)濕(shi)(shi)(shi)(shi)(shi)(shi)(shi)，使空(kong)(kong)氣(qi)變得(de)(de)干燥(zao)。目前國(guo)內(nei)(nei)(nei)(nei)(nei)外絕大多(duo)數的(de)(de)(de)溫(wen)(wen)(wen)濕(shi)(shi)(shi)(shi)(shi)(shi)(shi)度(du)(du)(du)箱都采用(yong)制冷(leng)(leng)(leng)(leng)除(chu)濕(shi)(shi)(shi)(shi)(shi)(shi)(shi)的(de)(de)(de)原理，是(shi)(shi)在(zai)(zai)箱體(ti)的(de)(de)(de)空(kong)(kong)氣(qi)預調室內(nei)(nei)(nei)(nei)(nei)加一(yi)組制冷(leng)(leng)(leng)(leng)光管。當濕(shi)(shi)(shi)(shi)(shi)(shi)(shi)空(kong)(kong)氣(qi)經(jing)過冷(leng)(leng)(leng)(leng)管時(shi)(shi)(shi)(shi)，其相(xiang)對(dui)(dui)(dui)(dui)濕(shi)(shi)(shi)(shi)(shi)(shi)(shi)度(du)(du)(du)會(hui)達(da)到(dao)100％RH，因(yin)空(kong)(kong)氣(qi)飽(bao)和(he)在(zai)(zai)光管上(shang)(shang)結露(lu)，使空(kong)(kong)氣(qi)變得(de)(de)更(geng)干燥(zao)。這(zhe)種除(chu)濕(shi)(shi)(shi)(shi)(shi)(shi)(shi)方(fang)式(shi)理論上(shang)(shang)可達(da)到(dao)零度(du)(du)(du)以下的(de)(de)(de)露(lu)點(dian)(dian)(dian)(dian)溫(wen)(wen)(wen)度(du)(du)(du)，但(dan)是(shi)(shi)當冷(leng)(leng)(leng)(leng)點(dian)(dian)(dian)(dian)表(biao)面溫(wen)(wen)(wen)度(du)(du)(du)到(dao)達(da)0℃時(shi)(shi)(shi)(shi)，光管表(biao)面結露(lu)的(de)(de)(de)水(shui)滴會(hui)結冰，從而影響光管表(biao)面的(de)(de)(de)熱交換，使除(chu)濕(shi)(shi)(shi)(shi)(shi)(shi)(shi)能力下降。又因(yin)為箱體(ti)不可能絕對(dui)(dui)(dui)(dui)密封，大氣(qi)中(zhong)(zhong)的(de)(de)(de)濕(shi)(shi)(shi)(shi)(shi)(shi)(shi)空(kong)(kong)氣(qi)會(hui)滲(shen)入到(dao)箱體(ti)內(nei)(nei)(nei)(nei)(nei)，使露(lu)點(dian)(dian)(dian)(dian)溫(wen)(wen)(wen)度(du)(du)(du)回(hui)升。另一(yi)方(fang)面，在(zai)(zai)光管間流動的(de)(de)(de)濕(shi)(shi)(shi)(shi)(shi)(shi)(shi)空(kong)(kong)氣(qi)只(zhi)是(shi)(shi)在(zai)(zai)和(he)光管（冷(leng)(leng)(leng)(leng)點(dian)(dian)(dian)(dian)）接(jie)(jie)觸(chu)的(de)(de)(de)瞬間達(da)到(dao)飽(bao)和(he)狀態而析(xi)出水(shui)蒸(zheng)汽，因(yin)此(ci)這(zhe)種除(chu)濕(shi)(shi)(shi)(shi)(shi)(shi)(shi)方(fang)法很(hen)難(nan)(nan)使箱體(ti)內(nei)(nei)(nei)(nei)(nei)的(de)(de)(de)露(lu)點(dian)(dian)(dian)(dian)溫(wen)(wen)(wen)度(du)(du)(du)在(zai)(zai)到(dao)0℃以下。實際(ji)所達(da)到(dao)的(de)(de)(de)最低(di)露(lu)點(dian)(dian)(dian)(dian)溫(wen)(wen)(wen)度(du)(du)(du)為5～7℃。露(lu)點(dian)(dian)(dian)(dian)溫(wen)(wen)(wen)度(du)(du)(du)5℃相(xiang)當于絕對(dui)(dui)(dui)(dui)含濕(shi)(shi)(shi)(shi)(shi)(shi)(shi)量為0.0055g/Kg，對(dui)(dui)(dui)(dui)應(ying)(ying)相(xiang)對(dui)(dui)(dui)(dui)濕(shi)(shi)(shi)(shi)(shi)(shi)(shi)度(du)(du)(du)20％RH的(de)(de)(de)溫(wen)(wen)(wen)度(du)(du)(du)為30℃。如(ru)(ru)果(guo)要求溫(wen)(wen)(wen)度(du)(du)(du)20℃進(jin)相(xiang)對(dui)(dui)(dui)(dui)濕(shi)(shi)(shi)(shi)(shi)(shi)(shi)度(du)(du)(du)達(da)到(dao)20％RH，此(ci)時(shi)(shi)(shi)(shi)的(de)(de)(de)露(lu)點(dian)(dian)(dian)(dian)溫(wen)(wen)(wen)度(du)(du)(du)為－3℃，采用(yong)致冷(leng)(leng)(leng)(leng)方(fang)式(shi)除(chu)濕(shi)(shi)(shi)(shi)(shi)(shi)(shi)是(shi)(shi)很(hen)困難(nan)(nan)的(de)(de)(de)，所高天公司在(zai)(zai)做(zuo)低(di)溫(wen)(wen)(wen)低(di)濕(shi)(shi)(shi)(shi)(shi)(shi)(shi)環境(jing)測試時(shi)(shi)(shi)(shi)選用(yong)空(kong)(kong)氣(qi)干燥(zao)系統(tong)。
三、氣候(hou)箱工作腔內環境(jing)
參數〔如(ru)溫(wen)(wen)(wen)(wen)(wen)(wen)(wen)度(du)(du)、濕(shi)度(du)(du)、鹽霧沉降(jiang)率等〕的(de)(de)(de)(de)精(jing)度(du)(du)指標都是在(zai)空(kong)載狀態(tai)下檢(jian)測的(de)(de)(de)(de)結果，一旦置入(ru)被試(shi)(shi)(shi)驗件(jian)后(hou)，對試(shi)(shi)(shi)驗箱工(gong)作(zuo)腔內環(huan)境參數的(de)(de)(de)(de)均(jun)勻(yun)性(xing)(xing)將產(chan)(chan)生影響，試(shi)(shi)(shi)驗件(jian)占有的(de)(de)(de)(de)空(kong)間越(yue)大(da)(da)(da)，這(zhe)種影響也就越(yue)嚴(yan)重。實測試(shi)(shi)(shi)驗數據表(biao)明，流(liu)(liu)場(chang)(chang)中(zhong)迎風面(mian)與(yu)(yu)背風面(mian)的(de)(de)(de)(de)溫(wen)(wen)(wen)(wen)(wen)(wen)(wen)差(cha)可(ke)達(da)(da)到(dao)(dao)3～8℃，嚴(yan)重時(shi)可(ke)大(da)(da)(da)到(dao)(dao)10℃以(yi)(yi)上(shang)(shang)。因此，必須(xu)盡(jin)量滿足a〕、b〕兩項要(yao)(yao)求，以(yi)(yi)保(bao)證被試(shi)(shi)(shi)產(chan)(chan)品周圍(wei)(wei)環(huan)境參數的(de)(de)(de)(de)均(jun)勻(yun)性(xing)(xing)。根(gen)據熱(re)傳導(dao)的(de)(de)(de)(de)原理，箱壁(bi)(bi)附(fu)(fu)近氣流(liu)(liu)的(de)(de)(de)(de)溫(wen)(wen)(wen)(wen)(wen)(wen)(wen)度(du)(du)通(tong)常與(yu)(yu)流(liu)(liu)場(chang)(chang)中(zhong)心溫(wen)(wen)(wen)(wen)(wen)(wen)(wen)度(du)(du)相差(cha)2～3℃，在(zai)高(gao)(gao)低溫(wen)(wen)(wen)(wen)(wen)(wen)(wen)的(de)(de)(de)(de)上(shang)(shang)下限時(shi)，還可(ke)能達(da)(da)到(dao)(dao)5℃。箱壁(bi)(bi)的(de)(de)(de)(de)溫(wen)(wen)(wen)(wen)(wen)(wen)(wen)度(du)(du)與(yu)(yu)箱壁(bi)(bi)附(fu)(fu)近流(liu)(liu)場(chang)(chang)的(de)(de)(de)(de)溫(wen)(wen)(wen)(wen)(wen)(wen)(wen)度(du)(du)又相差(cha)2～3℃（視箱壁(bi)(bi)的(de)(de)(de)(de)結構(gou)和材料而(er)定）試(shi)(shi)(shi)驗溫(wen)(wen)(wen)(wen)(wen)(wen)(wen)度(du)(du)與(yu)(yu)外(wai)界(jie)大(da)(da)(da)氣環(huan)境相差(cha)越(yue)大(da)(da)(da)，上(shang)(shang)述(shu)溫(wen)(wen)(wen)(wen)(wen)(wen)(wen)差(cha)也越(yue)大(da)(da)(da)，因此，距箱壁(bi)(bi)（100～150mm）距離內的(de)(de)(de)(de)空(kong)間是不(bu)可(ke)利用(yong)空(kong)間。溫(wen)(wen)(wen)(wen)(wen)(wen)(wen)度(du)(du)范圍(wei)(wei)的(de)(de)(de)(de)選擇(ze)目前(qian)，國外(wai)溫(wen)(wen)(wen)(wen)(wen)(wen)(wen)度(du)(du)試(shi)(shi)(shi)驗箱的(de)(de)(de)(de)范圍(wei)(wei)大(da)(da)(da)體(ti)(ti)上(shang)(shang)為(wei)－73～＋177℃，或－70～＋180℃。國內多(duo)數廠家一般為(wei)－80～＋130℃，－60～＋130℃，－40～＋130℃，也有高(gao)(gao)溫(wen)(wen)(wen)(wen)(wen)(wen)(wen)到(dao)(dao)150℃。這(zhe)些溫(wen)(wen)(wen)(wen)(wen)(wen)(wen)度(du)(du)范圍(wei)(wei)通(tong)常可(ke)以(yi)(yi)滿足國內絕大(da)(da)(da)多(duo)數軍用(yong)、民用(yong)產(chan)(chan)品溫(wen)(wen)(wen)(wen)(wen)(wen)(wen)度(du)(du)試(shi)(shi)(shi)驗的(de)(de)(de)(de)需(xu)要(yao)(yao)，除非確(que)有特殊需(xu)要(yao)(yao)，如(ru)安裝位置靠近發動機(ji)等熱(re)源的(de)(de)(de)(de)產(chan)(chan)品外(wai)，不(bu)可(ke)盲目提(ti)高(gao)(gao)溫(wen)(wen)(wen)(wen)(wen)(wen)(wen)度(du)(du)上(shang)(shang)限。因為(wei)上(shang)(shang)限溫(wen)(wen)(wen)(wen)(wen)(wen)(wen)度(du)(du)越(yue)高(gao)(gao)，箱體(ti)(ti)內外(wai)的(de)(de)(de)(de)溫(wen)(wen)(wen)(wen)(wen)(wen)(wen)差(cha)越(yue)大(da)(da)(da)，箱體(ti)(ti)內部流(liu)(liu)場(chang)(chang)的(de)(de)(de)(de)均(jun)勻(yun)性(xing)(xing)也越(yue)差(cha)。可(ke)利用(yong)的(de)(de)(de)(de)工(gong)作(zuo)室體(ti)(ti)積也就越(yue)小。另一方面(mian)，上(shang)(shang)限溫(wen)(wen)(wen)(wen)(wen)(wen)(wen)度(du)(du)值越(yue)高(gao)(gao)，對箱壁(bi)(bi)夾(jia)層中(zhong)保(bao)溫(wen)(wen)(wen)(wen)(wen)(wen)(wen)材料（如(ru)玻璃棉等）的(de)(de)(de)(de)耐熱(re)性(xing)(xing)要(yao)(yao)求越(yue)高(gao)(gao)。箱體(ti)(ti)密封性(xing)(xing)的(de)(de)(de)(de)要(yao)(yao)求也越(yue)高(gao)(gao)，使箱體(ti)(ti)的(de)(de)(de)(de)制作(zuo)成本增加。
四、控(kong)制方式(shi)(shi)的選擇：（恒(heng)定(ding)溫(wen)濕(shi)度和溫(wen)濕(shi)度交變(bian)-即單點(dian)式(shi)(shi)和可程式(shi)(shi)）
溫(wen)(wen)(wen)(wen)度(du)(du)、濕(shi)(shi)度(du)(du)試(shi)(shi)驗(yan)(yan)(yan)箱(xiang)(xiang)有恒定(ding)試(shi)(shi)驗(yan)(yan)(yan)箱(xiang)(xiang)、交變試(shi)(shi)驗(yan)(yan)(yan)箱(xiang)(xiang)兩種情況。普通的(de)(de)高(gao)(gao)低溫(wen)(wen)(wen)(wen)試(shi)(shi)驗(yan)(yan)(yan)箱(xiang)(xiang)一般指(zhi)的(de)(de)是(shi)恒定(ding)高(gao)(gao)低溫(wen)(wen)(wen)(wen)試(shi)(shi)驗(yan)(yan)(yan)箱(xiang)(xiang)，其控(kong)制(zhi)(zhi)方(fang)式為(wei)：設(she)定(ding)一個(ge)目標溫(wen)(wen)(wen)(wen)度(du)(du)，試(shi)(shi)驗(yan)(yan)(yan)箱(xiang)(xiang)具有自(zi)動恒溫(wen)(wen)(wen)(wen)到目標溫(wen)(wen)(wen)(wen)度(du)(du)點(dian)的(de)(de)能(neng)(neng)力(li)(li)。恒定(ding)溫(wen)(wen)(wen)(wen)濕(shi)(shi)度(du)(du)試(shi)(shi)驗(yan)(yan)(yan)箱(xiang)(xiang)的(de)(de)控(kong)制(zhi)(zhi)控(kong)制(zhi)(zhi)方(fang)式也(ye)類似，設(she)定(ding)一個(ge)目標溫(wen)(wen)(wen)(wen)度(du)(du)、濕(shi)(shi)度(du)(du)點(dian)，試(shi)(shi)驗(yan)(yan)(yan)箱(xiang)(xiang)具有自(zi)動恒溫(wen)(wen)(wen)(wen)到目標溫(wen)(wen)(wen)(wen)度(du)(du)、濕(shi)(shi)度(du)(du)點(dian)的(de)(de)能(neng)(neng)力(li)(li)。高(gao)(gao)、低溫(wen)(wen)(wen)(wen)交變試(shi)(shi)驗(yan)(yan)(yan)箱(xiang)(xiang)具有設(she)定(ding)一條或(huo)者(zhe)多(duo)條高(gao)(gao)低溫(wen)(wen)(wen)(wen)變化、循環的(de)(de)程序(xu)，試(shi)(shi)驗(yan)(yan)(yan)箱(xiang)(xiang)有能(neng)(neng)力(li)(li)根據(ju)預置的(de)(de)曲線(xian)完(wan)成試(shi)(shi)驗(yan)(yan)(yan)過(guo)程，并且可以在(zai)最大升溫(wen)(wen)(wen)(wen)、降溫(wen)(wen)(wen)(wen)速率(lv)能(neng)(neng)力(li)(li)的(de)(de)范圍內，精(jing)確控(kong)制(zhi)(zhi)升溫(wen)(wen)(wen)(wen)、降溫(wen)(wen)(wen)(wen)的(de)(de)速率(lv)，即可以根據(ju)設(she)定(ding)的(de)(de)曲線(xian)的(de)(de)斜(xie)率(lv)控(kong)制(zhi)(zhi)升溫(wen)(wen)(wen)(wen)、降溫(wen)(wen)(wen)(wen)速率(lv)。同樣，高(gao)(gao)低溫(wen)(wen)(wen)(wen)交變濕(shi)(shi)熱試(shi)(shi)驗(yan)(yan)(yan)箱(xiang)(xiang)也(ye)具有預置溫(wen)(wen)(wen)(wen)度(du)(du)、濕(shi)(shi)度(du)(du)曲線(xian)，并且根據(ju)預置進行控(kong)制(zhi)(zhi)的(de)(de)能(neng)(neng)力(li)(li)。
五(wu)、變(bian)溫速率的選(xuan)擇(ze)
普(pu)通的(de)(de)(de)(de)高低(di)溫(wen)(wen)(wen)(wen)(wen)(wen)(wen)(wen)(wen)(wen)試(shi)(shi)(shi)(shi)驗(yan)(yan)箱(xiang)(xiang)沒有(you)降(jiang)(jiang)(jiang)(jiang)(jiang)溫(wen)(wen)(wen)(wen)(wen)(wen)(wen)(wen)(wen)(wen)速(su)(su)(su)度(du)(du)(du)(du)(du)(du)(du)(du)的(de)(de)(de)(de)指標，從環境溫(wen)(wen)(wen)(wen)(wen)(wen)(wen)(wen)(wen)(wen)度(du)(du)(du)(du)(du)(du)(du)(du)降(jiang)(jiang)(jiang)(jiang)(jiang)溫(wen)(wen)(wen)(wen)(wen)(wen)(wen)(wen)(wen)(wen)到標稱的(de)(de)(de)(de)最(zui)低(di)溫(wen)(wen)(wen)(wen)(wen)(wen)(wen)(wen)(wen)(wen)度(du)(du)(du)(du)(du)(du)(du)(du)的(de)(de)(de)(de)時(shi)間(jian)一(yi)(yi)(yi)般(ban)為90～120min。高低(di)溫(wen)(wen)(wen)(wen)(wen)(wen)(wen)(wen)(wen)(wen)交(jiao)變(bian)(bian)(bian)(bian)試(shi)(shi)(shi)(shi)驗(yan)(yan)箱(xiang)(xiang)、高低(di)溫(wen)(wen)(wen)(wen)(wen)(wen)(wen)(wen)(wen)(wen)交(jiao)變(bian)(bian)(bian)(bian)濕(shi)熱試(shi)(shi)(shi)(shi)驗(yan)(yan)箱(xiang)(xiang)都有(you)變(bian)(bian)(bian)(bian)溫(wen)(wen)(wen)(wen)(wen)(wen)(wen)(wen)(wen)(wen)速(su)(su)(su)度(du)(du)(du)(du)(du)(du)(du)(du)的(de)(de)(de)(de)要求(qiu)，其變(bian)(bian)(bian)(bian)溫(wen)(wen)(wen)(wen)(wen)(wen)(wen)(wen)(wen)(wen)速(su)(su)(su)率(lv)(lv)一(yi)(yi)(yi)般(ban)要求(qiu)1℃/min，在此(ci)速(su)(su)(su)率(lv)(lv)的(de)(de)(de)(de)范圍內(nei)速(su)(su)(su)度(du)(du)(du)(du)(du)(du)(du)(du)可調。而(er)快(kuai)速(su)(su)(su)溫(wen)(wen)(wen)(wen)(wen)(wen)(wen)(wen)(wen)(wen)度(du)(du)(du)(du)(du)(du)(du)(du)變(bian)(bian)(bian)(bian)化試(shi)(shi)(shi)(shi)驗(yan)(yan)箱(xiang)(xiang)的(de)(de)(de)(de)變(bian)(bian)(bian)(bian)溫(wen)(wen)(wen)(wen)(wen)(wen)(wen)(wen)(wen)(wen)速(su)(su)(su)率(lv)(lv)較快(kuai)，升(sheng)溫(wen)(wen)(wen)(wen)(wen)(wen)(wen)(wen)(wen)(wen)、降(jiang)(jiang)(jiang)(jiang)(jiang)溫(wen)(wen)(wen)(wen)(wen)(wen)(wen)(wen)(wen)(wen)速(su)(su)(su)率(lv)(lv)可以達(da)到3℃/min～15℃/min，在某些溫(wen)(wen)(wen)(wen)(wen)(wen)(wen)(wen)(wen)(wen)度(du)(du)(du)(du)(du)(du)(du)(du)段升(sheng)溫(wen)(wen)(wen)(wen)(wen)(wen)(wen)(wen)(wen)(wen)、降(jiang)(jiang)(jiang)(jiang)(jiang)溫(wen)(wen)(wen)(wen)(wen)(wen)(wen)(wen)(wen)(wen)速(su)(su)(su)率(lv)(lv)甚至可以達(da)到30℃/min以上。各種規(gui)格、速(su)(su)(su)度(du)(du)(du)(du)(du)(du)(du)(du)的(de)(de)(de)(de)快(kuai)速(su)(su)(su)溫(wen)(wen)(wen)(wen)(wen)(wen)(wen)(wen)(wen)(wen)度(du)(du)(du)(du)(du)(du)(du)(du)變(bian)(bian)(bian)(bian)化試(shi)(shi)(shi)(shi)驗(yan)(yan)箱(xiang)(xiang)的(de)(de)(de)(de)溫(wen)(wen)(wen)(wen)(wen)(wen)(wen)(wen)(wen)(wen)度(du)(du)(du)(du)(du)(du)(du)(du)范圍一(yi)(yi)(yi)般(ban)都是(shi)(shi)相同的(de)(de)(de)(de)，即－60～＋130℃，但考核降(jiang)(jiang)(jiang)(jiang)(jiang)溫(wen)(wen)(wen)(wen)(wen)(wen)(wen)(wen)(wen)(wen)速(su)(su)(su)度(du)(du)(du)(du)(du)(du)(du)(du)的(de)(de)(de)(de)變(bian)(bian)(bian)(bian)溫(wen)(wen)(wen)(wen)(wen)(wen)(wen)(wen)(wen)(wen)范圍卻不(bu)盡相同，根據試(shi)(shi)(shi)(shi)驗(yan)(yan)不(bu)同的(de)(de)(de)(de)試(shi)(shi)(shi)(shi)驗(yan)(yan)要求(qiu)，快(kuai)速(su)(su)(su)溫(wen)(wen)(wen)(wen)(wen)(wen)(wen)(wen)(wen)(wen)度(du)(du)(du)(du)(du)(du)(du)(du)變(bian)(bian)(bian)(bian)化試(shi)(shi)(shi)(shi)驗(yan)(yan)箱(xiang)(xiang)變(bian)(bian)(bian)(bian)溫(wen)(wen)(wen)(wen)(wen)(wen)(wen)(wen)(wen)(wen)范圍有(you)的(de)(de)(de)(de)是(shi)(shi)－55～＋80℃，而(er)有(you)的(de)(de)(de)(de)是(shi)(shi)－40～＋80℃。關于快(kuai)速(su)(su)(su)溫(wen)(wen)(wen)(wen)(wen)(wen)(wen)(wen)(wen)(wen)度(du)(du)(du)(du)(du)(du)(du)(du)變(bian)(bian)(bian)(bian)化試(shi)(shi)(shi)(shi)驗(yan)(yan)箱(xiang)(xiang)的(de)(de)(de)(de)變(bian)(bian)(bian)(bian)溫(wen)(wen)(wen)(wen)(wen)(wen)(wen)(wen)(wen)(wen)速(su)(su)(su)率(lv)(lv)有(you)兩種提(ti)(ti)法，一(yi)(yi)(yi)種是(shi)(shi)全(quan)程平(ping)(ping)均(jun)(jun)(jun)升(sheng)降(jiang)(jiang)(jiang)(jiang)(jiang)溫(wen)(wen)(wen)(wen)(wen)(wen)(wen)(wen)(wen)(wen)速(su)(su)(su)度(du)(du)(du)(du)(du)(du)(du)(du)，一(yi)(yi)(yi)種是(shi)(shi)線(xian)形升(sheng)降(jiang)(jiang)(jiang)(jiang)(jiang)溫(wen)(wen)(wen)(wen)(wen)(wen)(wen)(wen)(wen)(wen)速(su)(su)(su)度(du)(du)(du)(du)(du)(du)(du)(du)（實(shi)際上是(shi)(shi)每(mei)(mei)5min平(ping)(ping)均(jun)(jun)(jun)速(su)(su)(su)度(du)(du)(du)(du)(du)(du)(du)(du)）。全(quan)程平(ping)(ping)均(jun)(jun)(jun)速(su)(su)(su)度(du)(du)(du)(du)(du)(du)(du)(du)是(shi)(shi)指在試(shi)(shi)(shi)(shi)驗(yan)(yan)箱(xiang)(xiang)的(de)(de)(de)(de)變(bian)(bian)(bian)(bian)溫(wen)(wen)(wen)(wen)(wen)(wen)(wen)(wen)(wen)(wen)范圍內(nei)，最(zui)高溫(wen)(wen)(wen)(wen)(wen)(wen)(wen)(wen)(wen)(wen)度(du)(du)(du)(du)(du)(du)(du)(du)與最(zui)低(di)溫(wen)(wen)(wen)(wen)(wen)(wen)(wen)(wen)(wen)(wen)度(du)(du)(du)(du)(du)(du)(du)(du)之差值與時(shi)間(jian)之比。目前國外各設(she)備生產廠家提(ti)(ti)供的(de)(de)(de)(de)變(bian)(bian)(bian)(bian)溫(wen)(wen)(wen)(wen)(wen)(wen)(wen)(wen)(wen)(wen)速(su)(su)(su)率(lv)(lv)的(de)(de)(de)(de)技術參(can)數都是(shi)(shi)指的(de)(de)(de)(de)全(quan)程平(ping)(ping)均(jun)(jun)(jun)速(su)(su)(su)率(lv)(lv)。線(xian)形升(sheng)降(jiang)(jiang)(jiang)(jiang)(jiang)溫(wen)(wen)(wen)(wen)(wen)(wen)(wen)(wen)(wen)(wen)速(su)(su)(su)度(du)(du)(du)(du)(du)(du)(du)(du)指在任意的(de)(de)(de)(de)每(mei)(mei)5min時(shi)間(jian)段內(nei)，能夠保(bao)證的(de)(de)(de)(de)變(bian)(bian)(bian)(bian)溫(wen)(wen)(wen)(wen)(wen)(wen)(wen)(wen)(wen)(wen)速(su)(su)(su)率(lv)(lv)。而(er)實(shi)際上對于快(kuai)速(su)(su)(su)溫(wen)(wen)(wen)(wen)(wen)(wen)(wen)(wen)(wen)(wen)度(du)(du)(du)(du)(du)(du)(du)(du)變(bian)(bian)(bian)(bian)化試(shi)(shi)(shi)(shi)驗(yan)(yan)箱(xiang)(xiang)來說，保(bao)證線(xian)形升(sheng)降(jiang)(jiang)(jiang)(jiang)(jiang)溫(wen)(wen)(wen)(wen)(wen)(wen)(wen)(wen)(wen)(wen)速(su)(su)(su)度(du)(du)(du)(du)(du)(du)(du)(du)的(de)(de)(de)(de)難度(du)(du)(du)(du)(du)(du)(du)(du)最(zui)大、最(zui)關鍵(jian)的(de)(de)(de)(de)一(yi)(yi)(yi)段是(shi)(shi)，在降(jiang)(jiang)(jiang)(jiang)(jiang)溫(wen)(wen)(wen)(wen)(wen)(wen)(wen)(wen)(wen)(wen)段最(zui)后(hou)的(de)(de)(de)(de)一(yi)(yi)(yi)個(ge)5min的(de)(de)(de)(de)時(shi)間(jian)段內(nei)，試(shi)(shi)(shi)(shi)驗(yan)(yan)箱(xiang)(xiang)可以達(da)到的(de)(de)(de)(de)降(jiang)(jiang)(jiang)(jiang)(jiang)溫(wen)(wen)(wen)(wen)(wen)(wen)(wen)(wen)(wen)(wen)速(su)(su)(su)率(lv)(lv)。從某種角度(du)(du)(du)(du)(du)(du)(du)(du)講，線(xian)形升(sheng)降(jiang)(jiang)(jiang)(jiang)(jiang)溫(wen)(wen)(wen)(wen)(wen)(wen)(wen)(wen)(wen)(wen)速(su)(su)(su)度(du)(du)(du)(du)(du)(du)(du)(du)（每(mei)(mei)5min平(ping)(ping)均(jun)(jun)(jun)速(su)(su)(su)度(du)(du)(du)(du)(du)(du)(du)(du)）更科學(xue)。因此(ci)試(shi)(shi)(shi)(shi)驗(yan)(yan)設(she)備最(zui)好具有(you)全(quan)程平(ping)(ping)均(jun)(jun)(jun)升(sheng)降(jiang)(jiang)(jiang)(jiang)(jiang)溫(wen)(wen)(wen)(wen)(wen)(wen)(wen)(wen)(wen)(wen)速(su)(su)(su)度(du)(du)(du)(du)(du)(du)(du)(du)和線(xian)形升(sheng)降(jiang)(jiang)(jiang)(jiang)(jiang)溫(wen)(wen)(wen)(wen)(wen)(wen)(wen)(wen)(wen)(wen)速(su)(su)(su)度(du)(du)(du)(du)(du)(du)(du)(du)（每(mei)(mei)5min平(ping)(ping)均(jun)(jun)(jun)速(su)(su)(su)度(du)(du)(du)(du)(du)(du)(du)(du)）這兩個(ge)參(can)數。一(yi)(yi)(yi)般(ban)來說，線(xian)形升(sheng)降(jiang)(jiang)(jiang)(jiang)(jiang)溫(wen)(wen)(wen)(wen)(wen)(wen)(wen)(wen)(wen)(wen)速(su)(su)(su)度(du)(du)(du)(du)(du)(du)(du)(du)（每(mei)(mei)5 min平(ping)(ping)均(jun)(jun)(jun)速(su)(su)(su)度(du)(du)(du)(du)(du)(du)(du)(du)）是(shi)(shi)全(quan)程平(ping)(ping)均(jun)(jun)(jun)升(sheng)降(jiang)(jiang)(jiang)(jiang)(jiang)溫(wen)(wen)(wen)(wen)(wen)(wen)(wen)(wen)(wen)(wen)速(su)(su)(su)度(du)(du)(du)(du)(du)(du)(du)(du)的(de)(de)(de)(de)1/2。
六、風速
有關標準規(gui)定，進(jin)行時溫(wen)濕(shi)箱內(nei)(nei)(nei)的(de)風速(su)(su)應小于1.7m/s，對(dui)于試(shi)(shi)驗本身來(lai)說(shuo)，風速(su)(su)越(yue)小越(yue)好，風速(su)(su)過大會加速(su)(su)試(shi)(shi)驗件(jian)表面與箱體(ti)內(nei)(nei)(nei)流(liu)動氣流(liu)的(de)熱交換，于試(shi)(shi)驗的(de)真實性不利。但為了保證試(shi)(shi)驗箱工作室(shi)內(nei)(nei)(nei)的(de)均勻性，試(shi)(shi)驗箱內(nei)(nei)(nei)具有循環風是(shi)(shi)(shi)必需的(de)。但是(shi)(shi)(shi)快速(su)(su)溫(wen)度變(bian)(bian)化試(shi)(shi)驗箱以及(ji)溫(wen)度、濕(shi)度、振動等多因素綜(zong)合箱，為追求變(bian)(bian)溫(wen)速(su)(su)率(lv)，必須加快箱體(ti)內(nei)(nei)(nei)循環氣流(liu)的(de)流(liu)速(su)(su)，風速(su)(su)通(tong)常在(zai)2～3m/s。因此，對(dui)于不同的(de)使用目(mu)的(de)，風速(su)(su)的(de)限制是(shi)(shi)(shi)不一樣(yang)的(de)。
七、溫(wen)度波動度
溫度波動(dong)是一個比較容易實現的(de)參數，所有(you)設(she)備廠(chang)家生(sheng)產的(de)多數的(de)試驗箱(xiang)實際的(de)溫度波動(dong)都可(ke)以控(kong)制(zhi)在±0.3℃的(de)范圍以內。
八、溫度場(chang)均勻度
為了更正確(que)地(di)模擬產品在(zai)(zai)自(zi)然界所遭受(shou)的(de)(de)實(shi)際環境(jing)狀況，在(zai)(zai)中(zhong)必須(xu)保證(zheng)被試產品的(de)(de)周(zhou)邊處在(zai)(zai)同(tong)一溫(wen)(wen)度(du)(du)環境(jing)條件(jian)下，為此(ci)，必須(xu)對試驗箱內的(de)(de)溫(wen)(wen)度(du)(du)梯度(du)(du)和溫(wen)(wen)度(du)(du)的(de)(de)波動度(du)(du)加以限制。在(zai)(zai)國軍標GJB150.1－86軍用設備方法總(zong)則中(zhong)明確(que)規定(ding)“試驗樣品附近測(ce)量(liang)系統的(de)(de)溫(wen)(wen)度(du)(du)應在(zai)(zai)試驗溫(wen)(wen)度(du)(du)的(de)(de)±2℃以內，其溫(wen)(wen)度(du)(du)工不(bu)超過(guo)1℃/m或總(zong)的(de)(de)最大值(zhi)為2.2℃（試驗樣品不(bu)工作）"。
九、濕度的精度控(kong)制
箱中(zhong)測量濕度(du)多數(shu)是采用(yong)干濕球法，設備的制(zhi)造標準GB10586要求(qiu)，相對濕度(du)偏差(cha)應在±２３％RH。為滿(man)足濕度(du)控(kong)制(zhi)精(jing)度(du)的要求(qiu)，濕度(du)試驗箱的溫度(du)控(kong)制(zhi)精(jing)度(du)較高，溫度(du)波動一般小于±0.2℃。否則很難(nan)達到濕度(du)控(kong)制(zhi)精(jing)度(du)的要求(qiu)。
恒溫(wen)恒濕試驗箱出現噪(zao)音應該(gai)如(ru)何解決？
經常會有客戶向我們求助:試驗(yan)箱(xiang)在(zai)使用過程中為(wei)何出(chu)現(xian)異響？而(er)恒(heng)溫恒(heng)濕試驗(yan)箱(xiang)聲音噪音很大一(yi)部分(fen)原因(yin)是壓縮機造成(cheng)的(de)，因(yin)為(wei)壓縮機是恒(heng)溫恒(heng)濕試驗(yan)箱(xiang)的(de)重要組成(cheng)部件。
原因(yin)有很多，就比(bi)如(ru)說鈑(ban)金工(gong)藝所(suo)(suo)致。如(ru)果鈑(ban)金設計不合理，且試(shi)驗箱使(shi)用材料(liao)較差，加上整體工(gong)藝不好，就會(hui)特別(bie)容易產生振動，由(you)此發出噪音(yin)，隨(sui)著時(shi)間越久噪音(yin)會(hui)越大。所(suo)(suo)以在選購(gou)試(shi)驗箱的時(shi)候要注意(yi)將生產廠(chang)家所(suo)(suo)用材質和加工(gong)工(gong)藝進行對(dui)比(bi)。
恒(heng)溫恒(heng)濕試驗箱使用較長時間(jian)后(hou)，有(you)可能(neng)試驗箱會(hui)出現噪音。出現噪音時，首(shou)先(xian)要(yao)學會(hui)判斷(duan)是什(shen)么原因引(yin)起(qi)的，然后(hou)再根據具體情況(kuang)解決減(jian)弱噪音。
1.吸入液(ye)體制冷劑(ji)造(zao)成液(ye)擊調整系統的工作情況，放(fang)出(chu)多余的制冷劑(ji)；
2.系(xi)統(tong)潤(run)滑(hua)油(you)過(guo)多而產生液擊，檢修(xiu)潤(run)滑(hua)油(you)系(xi)統(tong)使(shi)之正常工作；
3.壓(ya)縮(suo)機氣缸、曲軸產生的雜(za)聲，更(geng)換壓(ya)縮(suo)機；
4.看減震彈簧(huang)是否變(bian)形，如(ru)果變(bian)形會影響到(dao)調壓功(gong)能的穩定性，從(cong)而發(fa)出噪(zao)聲；
5.看針閥(fa)磨損程度，錐面(mian)與閥(fa)座是否能(neng)密合(he)，如果不能(neng)則會使先導流量不穩定，以致(zhi)壓力波動產生噪音；
6.檢查油液(ye)中是(shi)否混(hun)入了空(kong)氣，形成氣穴現(xian)象而發出(chu)噪音。如果是(shi)部(bu)件變形磨損只要(yao)更換(huan)就(jiu)好，油液(ye)中混(hun)入空(kong)氣，及時排除并注意密(mi)封防止空(kong)氣重新進入就(jiu)可以降低噪音。
東莞恒(heng)(heng)工(gong)設(she)(she)備是從(cong)事(shi)恒(heng)(heng)溫(wen)(wen)恒(heng)(heng)濕(shi)試(shi)(shi)(shi)(shi)(shi)驗(yan)(yan)(yan)箱，步入式(shi)環境試(shi)(shi)(shi)(shi)(shi)驗(yan)(yan)(yan)室(shi)，快速(su)溫(wen)(wen)變試(shi)(shi)(shi)(shi)(shi)驗(yan)(yan)(yan)箱，冷熱(re)沖(chong)(chong)(chong)擊試(shi)(shi)(shi)(shi)(shi)驗(yan)(yan)(yan)箱，高(gao)低(di)溫(wen)(wen)低(di)氣壓試(shi)(shi)(shi)(shi)(shi)驗(yan)(yan)(yan)箱，UV光照氣候(hou)試(shi)(shi)(shi)(shi)(shi)驗(yan)(yan)(yan)箱，電池熱(re)沖(chong)(chong)(chong)擊試(shi)(shi)(shi)(shi)(shi)驗(yan)(yan)(yan)箱，高(gao)溫(wen)(wen)時效爐等設(she)(she)備研發和生(sheng)產廠家(jia)之一，恒(heng)(heng)溫(wen)(wen)恒(heng)(heng)濕(shi)試(shi)(shi)(shi)(shi)(shi)驗(yan)(yan)(yan)箱，恒(heng)(heng)溫(wen)(wen)恒(heng)(heng)濕(shi)箱，高(gao)低(di)溫(wen)(wen)箱，冷熱(re)沖(chong)(chong)(chong)擊試(shi)(shi)(shi)(shi)(shi)驗(yan)(yan)(yan)箱，高(gao)低(di)溫(wen)(wen)沖(chong)(chong)(chong)擊試(shi)(shi)(shi)(shi)(shi)驗(yan)(yan)(yan)箱具有行業領(ling)先地(di)位(wei)，累積豐(feng)富行業經驗(yan)(yan)(yan)，具產品(pin)開發能力，獲多項國家(jia)專(zhuan)利，業務聯系(xi)：潘先生(sheng)
