進(jin)口(kou)真空(kong)(kong)(kong)泵的(de)功(gong)用就是以真空(kong)(kong)(kong)室中抽除氣體分(fen)子,降低(di)真空(kong)(kong)(kong)室內的(de)氣體壓力,使之達(da)到要(yao)(yao)求的(de)真空(kong)(kong)(kong)度(du)。概括地講(jiang)從大氣到極高真空(kong)(kong)(kong)有(you)一(yi)個很(hen)大的(de)范(fan)(fan)圍,至(zhi)今(jin)為止還沒有(you)一(yi)種真空(kong)(kong)(kong)系統(tong)能覆蓋(gai)這個范(fan)(fan)圍。因此,為達(da)到不(bu)(bu)同產(chan)品的(de)工(gong)(gong)(gong)藝指標、工(gong)(gong)(gong)作效(xiao)率(lv)和(he)設備工(gong)(gong)(gong)作壽(shou)命要(yao)(yao)求、不(bu)(bu)同的(de)真空(kong)(kong)(kong)區段需要(yao)(yao)選擇(ze)不(bu)(bu)同的(de)真空(kong)(kong)(kong)系統(tong)配置(zhi)。為達(da)到最(zui)佳配置(zhi),選擇(ze)真空(kong)(kong)(kong)系統(tong)時,進(jin)口(kou)真空(kong)(kong)(kong)泵的(de)選購和(he)性(xing)價比應考(kao)慮下述各(ge)點,確定工(gong)(gong)(gong)作真空(kong)(kong)(kong)范(fan)(fan)圍。
最(zui)先務必檢查(cha)(cha)確認(ren)每(mei)一種工藝標(biao)準(zhun)的真(zhen)(zhen)空(kong)(kong)度(du)。由于(yu)每(mei)一種工藝都有(you)其(qi)適應的真(zhen)(zhen)空(kong)(kong)度(du)范(fan)圍(wei),務必用心(xin)研(yan)究確認(ren)之(zhi)。 明(ming)確極(ji)限真(zhen)(zhen)空(kong)(kong)度(du) 在明(ming)確了工藝標(biao)準(zhun)的真(zhen)(zhen)空(kong)(kong)度(du)的基礎上(shang)檢查(cha)(cha)進口(kou)真(zhen)(zhen)空(kong)(kong)泵系(xi)統(tong)的極(ji)限真(zhen)(zhen)空(kong)(kong)度(du),由于(yu)系(xi)統(tong)的極(ji)限真(zhen)(zhen)空(kong)(kong)度(du)決定了系(xi)統(tong)的最(zui)佳工作真(zhen)(zhen)空(kong)(kong)度(du)。
通常情況下,系(xi)統(tong)的(de)極限真(zhen)空(kong)度(du)比系(xi)統(tong)的(de)工作真(zhen)空(kong)度(du)低20%,比前級泵的(de)極限真(zhen)空(kong)度(du)低50%。 被抽氣體種類與抽氣量 檢查確定工藝要求的(de)抽氣種類與抽氣量。
由于假如(ru)被抽氣(qi)體種類與(yu)泵(beng)(beng)內液(ye)體產生反應,泵(beng)(beng)系統將被污染。同時務必考慮(lv)(lv)確認適合的(de)排氣(qi)時間與(yu)抽氣(qi)過程中(zhong)造成的(de)氣(qi)體量。 真(zhen)(zhen)空容積(ji) 檢(jian)查確認達到(dao)要求的(de)真(zhen)(zhen)空度(du)所需要的(de)時間、真(zhen)(zhen)空管(guan)道的(de)流阻(zu)與(yu)泄漏。考慮(lv)(lv)達到(dao)要求真(zhen)(zhen)空度(du)后在(zai)一定工藝(yi)規定條件下(xia)維(wei)持真(zhen)(zhen)空需要的(de)抽氣(qi)速率。?
真(zhen)(zhen)(zhen)空(kong)(kong)(kong)干燥箱和(he)真(zhen)(zhen)(zhen)空(kong)(kong)(kong)濃縮儀(yi)(yi)中用的(de)(de)進口真(zhen)(zhen)(zhen)空(kong)(kong)(kong)泵(beng)標準(zhun)就(jiu)高,因此在(zai)選進口真(zhen)(zhen)(zhen)空(kong)(kong)(kong)泵(beng)時就(jiu)要留意要挑(tiao)(tiao)選真(zhen)(zhen)(zhen)空(kong)(kong)(kong)度高,抽氣(qi)效率(lv)大的(de)(de)進口真(zhen)(zhen)(zhen)空(kong)(kong)(kong)泵(beng),如旋(xuan)(xuan)片式真(zhen)(zhen)(zhen)空(kong)(kong)(kong)泵(beng)就(jiu)能夠(gou)符合要求;而抽濾(lv),旋(xuan)(xuan)轉蒸發儀(yi)(yi)要求的(de)(de)真(zhen)(zhen)(zhen)空(kong)(kong)(kong)度和(he)抽氣(qi)效率(lv)相(xiang)對低,因此可(ke)挑(tiao)(tiao)選一般的(de)(de)真(zhen)(zhen)(zhen)空(kong)(kong)(kong)泵(beng)就(jiu)可(ke)以(yi),如隔膜(mo)真(zhen)(zhen)(zhen)空(kong)(kong)(kong)泵(beng)和(he)循環水真(zhen)(zhen)(zhen)空(kong)(kong)(kong)泵(beng)就(jiu)可(ke)以(yi)。?
隔膜真(zhen)空(kong)(kong)泵(beng)根據對氣(qi)(qi)(qi)體(ti)(ti)處理的(de)不同水平可(ke)以分成一(yi)級(ji)(ji)泵(beng),二級(ji)(ji)泵(beng),三級(ji)(ji)泵(beng)和四(si)(si)級(ji)(ji)泵(beng),一(yi)級(ji)(ji)泵(beng)時對氣(qi)(qi)(qi)體(ti)(ti)歷(li)經(jing)一(yi)次的(de)壓縮處理而達(da)到(dao)抽(chou)(chou)氣(qi)(qi)(qi)減壓的(de)功效,一(yi)級(ji)(ji)泵(beng)真(zhen)空(kong)(kong)度低但(dan)抽(chou)(chou)氣(qi)(qi)(qi)量大,四(si)(si)級(ji)(ji)泵(beng)是對氣(qi)(qi)(qi)體(ti)(ti)歷(li)經(jing)四(si)(si)次壓縮解決而達(da)到(dao)抽(chou)(chou)氣(qi)(qi)(qi)減壓的(de)功效,四(si)(si)級(ji)(ji)泵(beng)技術標(biao)準較高(gao)(gao),四(si)(si)級(ji)(ji)泵(beng)真(zhen)空(kong)(kong)度最(zui)高(gao)(gao)但(dan)抽(chou)(chou)氣(qi)(qi)(qi)效率(lv)小,國內的(de)隔膜最(zui)大做到(dao)二級(ji)(ji),國外(wai)最(zui)高(gao)(gao)做到(dao)四(si)(si)級(ji)(ji),因此真(zhen)空(kong)(kong)度越高(gao)(gao),抽(chou)(chou)氣(qi)(qi)(qi)速率(lv)越大價錢也就越貴,所以選擇進口真(zhen)空(kong)(kong)泵(beng)時一(yi)定(ding)要根據實際情況來選擇。?
進口真空泵因為(wei)構造簡單,出(chu)廠(chang)時就調節安裝好(hao),顧(gu)客取得貨就可按說(shuo)明恰當運(yun)用,不需上門(men)安裝。如(ru)有難題可以電話指導,解決(jue)困難。