1、真(zhen)空(kong)(kong)(kong)(kong)泵(beng)(beng)的(de)(de)工(gong)(gong)(gong)作(zuo)(zuo)壓(ya)強(qiang)應該滿足真(zhen)空(kong)(kong)(kong)(kong)設(she)備(bei)的(de)(de)極(ji)限(xian)真(zhen)空(kong)(kong)(kong)(kong)及(ji)工(gong)(gong)(gong)作(zuo)(zuo)壓(ya)強(qiang)要求。如：某真(zhen)空(kong)(kong)(kong)(kong)干燥工(gong)(gong)(gong)藝要求10mmHg的(de)(de)工(gong)(gong)(gong)作(zuo)(zuo)真(zhen)空(kong)(kong)(kong)(kong)度，選用(yong)的(de)(de)真(zhen)空(kong)(kong)(kong)(kong)泵(beng)(beng)的(de)(de)極(ji)限(xian)真(zhen)空(kong)(kong)(kong)(kong)度至(zhi)少要2mmHg，最好能達到1mmHg。通常選擇(ze)泵(beng)(beng)的(de)(de)極(ji)限(xian)真(zhen)空(kong)(kong)(kong)(kong)度要高于(yu)真(zhen)空(kong)(kong)(kong)(kong)設(she)備(bei)工(gong)(gong)(gong)作(zuo)(zuo)真(zhen)空(kong)(kong)(kong)(kong)度半個到一(yi)個數量級(ji)。 2、正確地選擇(ze)真(zhen)空(kong)(kong)(kong)(kong)泵(beng)(beng)的(de)(de)工(gong)(gong)(gong)作(zuo)(zuo)點。每種泵(beng)(beng)都有一(yi)定的(de)(de)工(gong)(gong)(gong)作(zuo)(zuo)壓(ya)強(qiang)范圍，如：2BV系列水環真(zhen)空(kong)(kong)(kong)(kong)泵(beng)(beng)工(gong)(gong)(gong)作(zuo)(zuo)壓(ya)強(qiang)范圍760mmHg~25mmHg（絕壓(ya)），在這樣寬(kuan)壓(ya)強(qiang)范圍內，泵(beng)(beng)的(de)(de)抽(chou)速隨壓(ya)強(qiang)而變化(hua)（詳(xiang)細(xi)變化(hua)情況參照泵(beng)(beng)的(de)(de)性能曲線），其穩(wen)定的(de)(de)工(gong)(gong)(gong)作(zuo)(zuo)壓(ya)強(qiang)范圍為(wei)760~

低真(zhen)(zhen)空(kong)(kong)(kong)裝置(zhi)如真(zhen)(zhen)空(kong)(kong)(kong)輸(shu)送、真(zhen)(zhen)空(kong)(kong)(kong)浸漬、真(zhen)(zhen)空(kong)(kong)(kong)過濾、真(zhen)(zhen)空(kong)(kong)(kong)單調、真(zhen)(zhen)空(kong)(kong)(kong)脫氣(qi)（鋼水(shui)(shui)處置(zhi)）等懇求(qiu)具有工(gong)作壓力高(gao)、排(pai)氣(qi)量大的低真(zhen)(zhen)空(kong)(kong)(kong)泵(beng)(beng)(beng)抽氣(qi)機(ji)組，這類低真(zhen)(zhen)空(kong)(kong)(kong)抽氣(qi)機(ji)組主(zhu)泵(beng)(beng)(beng)常用往(wang)復式真(zhen)(zhen)空(kong)(kong)(kong)泵(beng)(beng)(beng)、油封(feng)式真(zhen)(zhen)空(kong)(kong)(kong)泵(beng)(beng)(beng)、水(shui)(shui)蒸(zheng)氣(qi)放射泵(beng)(beng)(beng)、水(shui)(shui)環泵(beng)(beng)(beng)、羅(luo)茨泵(beng)(beng)(beng)等。運用的低真(zhen)(zhen)空(kong)(kong)(kong)抽氣(qi)機(ji)組還需根據被抽氣(qi)體清潔(jie)程(cheng)度(du)(du)、濕度(du)(du)或(huo)其他(ta)特殊(shu)懇求(qiu)，配置(zhi)必(bi)要的除塵器、單調罐等部件(jian)。 水(shui)(shui)蒸(zheng)氣(qi)在緊縮過程(cheng)中會凝(ning)結成水(shui)(shui)滴，并與(yu)(yu)泵(beng)(beng)(beng)混合構成懸(xuan)浮液，不只會使(shi)真(zhen)(zhen)空(kong)(kong)(kong)度(du)(du)降落，也能使(shi)泵(beng)(beng)(beng)腔與(yu)(yu)轉(zhuan)子生銹，破壞密(mi)封(feng)面(mian)，使(shi)泵(beng)(beng)(beng)的極限(xian)真(zhen)(zhen)空(kong)(kong)(kong)度(du)(du)降落。為此，防止水(shui)(shui)蒸(zheng)氣(qi)對機(ji)械泵(beng)(beng)(beng)的污(wu)染

據中國建(jian)材雜志消(xiao)息，近日，南京玻璃纖維(wei)研究設計院牽(qian)頭制定(ding)的(de)(de)兩項(xiang)真(zhen)空(kong)絕熱板國家標準GB/T 39548—2020《真(zhen)空(kong)絕熱板濕(shi)熱條(tiao)件下熱阻保留率的(de)(de)測定(ding)》和(he)GB/T 39704—2020《真(zhen)空(kong)絕熱板有(you)效(xiao)導熱系數的(de)(de)測定(ding)》由國家市場監(jian)督管理總局批準發布。這(zhe)兩項(xiang)標準將(jiang)于2021年11月1日實(shi)施。 真(zhen)空(kong)絕熱板（VIP）是一種超級絕熱材料，具有(you)環保和(he)高效(xiao)節能(neng)的(de)(de)特性，在(zai)冰箱、冷鏈、建(jian)筑等(deng)行(xing)業具有(you)廣泛的(de)(de)應用。但由于其結構的(de)(de)特殊(shu)性，在(zai)使用過(guo)程中很(hen)可能(neng)發生失效(xiao)，造成保溫性能(neng)的(de)(de)衰減。 目(mu)前(qian)，市場