无油式真空泵是一(yi)种旋转式变容真(zhen)(zhen)空(kong)(kong)(kong)(kong)泵(beng)(beng)(beng)须有前级泵(beng)(beng)(beng)配合方可(ke)使用在较(jiao)宽的压力范(fan)围内有较(jiao)大的抽(chou)速(su)对被抽(chou)除气体中含有灰(hui)尘和水蒸(zheng)汽不敏(min)感广泛用于冶金(jin)、化(hua)工(gong)、食品、电子镀膜等行业。主要有WLW系列立(li)(li)式无油真(zhen)(zhen)空(kong)(kong)(kong)(kong)泵(beng)(beng)(beng)、W型(xing)(xing)(xing)(xing)(xing)往复式真(zhen)(zhen)空(kong)(kong)(kong)(kong)泵(beng)(beng)(beng)、2X,2XZ型(xing)(xing)(xing)(xing)(xing)旋片式真(zhen)(zhen)空(kong)(kong)(kong)(kong)泵(beng)(beng)(beng)、ZJ，ZJH型(xing)(xing)(xing)(xing)(xing)罗(luo)(luo)茨(ci)真(zhen)(zhen)空(kong)(kong)(kong)(kong)泵(beng)(beng)(beng)（ZJH型(xing)(xing)(xing)(xing)(xing)为(wei)专利产真(zhen)(zhen)空(kong)(kong)(kong)(kong)泵(beng)(beng)(beng)品）、2SK、SK型(xing)(xing)(xing)(xing)(xing)水环式真(zhen)(zhen)空(kong)(kong)(kong)(kong)泵(beng)(beng)(beng)、2BV、2BA型(xing)(xing)(xing)(xing)(xing)水环式真(zhen)(zhen)空(kong)(kong)(kong)(kong)泵(beng)(beng)(beng)、H、2H型(xing)(xing)(xing)(xing)(xing)滑阀真(zhen)(zhen)空(kong)(kong)(kong)(kong)泵(beng)(beng)(beng)、TLZ型(xing)(xing)(xing)(xing)(xing)真(zhen)(zhen)空(kong)(kong)(kong)(kong)泵(beng)(beng)(beng)、SL型(xing)(xing)(xing)(xing)(xing)罗(luo)(luo)茨(ci)鼓风机(ji)(ji)、JZJHX型(xing)(xing)(xing)(xing)(xing)罗(luo)(luo)茨(ci)旋片真(zhen)(zhen)空(kong)(kong)(kong)(kong)机(ji)(ji)组、JZJHS型(xing)(xing)(xing)(xing)(xing)罗(luo)(luo)茨(ci)水环真(zhen)(zhen)空(kong)(kong)(kong)(kong)机(ji)(ji)组、JZJHWLW型(xing)(xing)(xing)(xing)(xing)立(li)(li)式无油真(zhen)(zhen)空(kong)(kong)(kong)(kong)机(ji)(ji)组、JZJP型(xing)(xing)(xing)(xing)(xing)罗(luo)(luo)茨(ci)水喷射真(zhen)(zhen)空(kong)(kong)(kong)(kong)机(ji)(ji)组、JZJHBA型(xing)(xing)(xing)(xing)(xing)罗(luo)(luo)茨(ci)水环真(zhen)(zhen)空(kong)(kong)(kong)(kong)机(ji)(ji)组、RPP型(xing)(xing)(xing)(xing)(xing)水喷射真(zhen)(zhen)空(kong)(kong)(kong)(kong)泵(beng)(beng)(beng)、JZJH2H型(xing)(xing)(xing)(xing)(xing)罗(luo)(luo)茨(ci)滑阀式真(zhen)(zhen)空(kong)(kong)(kong)(kong)机(ji)(ji)组等型(xing)(xing)(xing)(xing)(xing)号。　　

　　工作原理：　

　　1.首(shou)先应该(gai)充分(fen)了解被抽气(qi)(qi)体(ti)成分(fen)。如(ru)(ru)气(qi)(qi)体(ti)中含(han)(han)不含(han)(han)可凝(ning)蒸(zheng)气(qi)(qi)、有(you)无颗粒灰(hui)尘(chen)、有(you)无腐(fu)蚀(shi)性、爆炸(zha)性等。如(ru)(ru)果气(qi)(qi)体(ti)中含(han)(han)有(you)蒸(zheng)气(qi)(qi)、颗粒、及腐(fu)蚀(shi)性气(qi)(qi)体(ti)，应该(gai)考虑在泵的进气(qi)(qi)口管路上安装辅助设备，如(ru)(ru)冷凝(ning)器(qi)、除尘(chen)器(qi)等。如(ru)(ru)抽取气(qi)(qi)体(ti)还有(you)腐(fu)蚀(shi)性，则(ze)须选用材质。若抽取的气(qi)(qi)体(ti)具有(you)爆炸(zha)性，则(ze)应该(gai)选择水(shui)环(huan)式真空泵并且配防(fang)爆电(dian)机，因为水(shui)环(huan)式真空泵整个工作(zuo)过程(cheng)是(shi)等温的。　　

　　2.真(zhen)空设备(bei)(bei)或者零(ling)部件对油(you)(you)(you)(you)(you)污染(ran)的要(yao)(yao)求(qiu)。若设备(bei)(bei)严(yan)格(ge)要(yao)(yao)求(qiu)无油(you)(you)(you)(you)(you)时，应(ying)该选各种无油(you)(you)(you)(you)(you)泵，如：水环(huan)式(shi)真(zhen)空泵、分子筛(shai)吸附(fu)泵、溅射离子泵、低温泵等。若要(yao)(yao)求(qiu)不(bu)严(yan)格(ge)，可以选择(ze)有油(you)(you)(you)(you)(you)泵，并且加(jia)上(shang)一些防油(you)(you)(you)(you)(you)污染(ran)措(cuo)施，如加(jia)冷阱、障板、挡油(you)(you)(you)(you)(you)阱等，也能(neng)达(da)到(dao)清洁(jie)真(zhen)空要(yao)(yao)求(qiu)。　　

　　3.真空泵排出来的油(you)蒸气对环(huan)(huan)境的影响如(ru)何。如(ru)果环(huan)(huan)境不允许有(you)污染，可(ke)以选(xuan)无油(you)真空泵如(ru)水(shui)环(huan)(huan)式真空泵，或者把油(you)蒸气排到室外(wai)。　　

　　4.如有多(duo)台大型水环式真(zhen)空泵同时(shi)工作，循环液应该进行(xing)冷(leng)却(que)，否则(ze)影响真(zhen)空度。冷(leng)却(que)装置(zhi)可以配(pei)备冷(leng)却(que)塔，同时(shi)须配(pei)增压泵对(dui)管路加压。　

　　5.真(zhen)空泵(beng)的工作(zuo)压(ya)强(qiang)应该满足真(zhen)空设备的极限(xian)真(zhen)空及(ji)工作(zuo)压(ya)强(qiang)要求(qiu)。通常选择真(zhen)空泵(beng)泵(beng)的真(zhen)空度要高于真(zhen)空设备真(zhen)空度半(ban)个到一个数量级。　

　　6.真空(kong)泵在其工作压(ya)强下，应能排走真空(kong)设备工艺过程中(zhong)产生的全部气体量。

它具(ju)有结构(gou)简(jian)单、操作(zuo)容易、维(wei)护方便、不会污染环(huan)境(jing)等(deng)优点(dian)。无油(you)真空(kong)(kong)泵(beng)耐用性(xing)好，是抽真空(kong)(kong)，压缩，两用真空(kong)(kong)泵(beng)，是一种应用范(fan)围(wei)非常(chang)广泛获得真空(kong)(kong)的(de)基本设备。

无油(you)真(zhen)(zhen)空泵与油(you)泵相比真(zhen)(zhen)空度低，抽气量小，但体(ti)积(ji)小巧，易于安装，维护简单，移动方便，不产生油(you)烟(yan)，不污染环境(jing)，尤(you)其在要求较(jiao)高的(de)(de)实验室使用较(jiao)好。也是实验室最常备的(de)(de)设备之一。

因此在选购无油真(zhen)空(kong)泵(beng)时要先确(que)定要求(qiu)(qiu)工作的(de)(de)(de)真(zhen)空(kong)度(du)，如(ru)果需(xu)(xu)求(qiu)(qiu)的(de)(de)(de)真(zhen)度(du)高，而选的(de)(de)(de)真(zhen)空(kong)泵(beng)就(jiu)要高于需(xu)(xu)求(qiu)(qiu)的(de)(de)(de)真(zhen)空(kong)度(du)，否则达不到抽(chou)真(zhen)空(kong)的(de)(de)(de)要求(qiu)(qiu)，就(jiu)会达不到工作要求(qiu)(qiu)。其(qi)次是无油真(zhen)空(kong)泵(beng)抽(chou)气速(su)率，选型时就(jiu)要稍大于所需(xu)(xu)求(qiu)(qiu)的(de)(de)(de)抽(chou)气速(su)率，这样就(jiu)能(neng)更好(hao)的(de)(de)(de)满(man)足需(xu)(xu)要。最后看抽(chou)取的(de)(de)(de)气体有(you)无腐蚀性，有(you)腐蚀的(de)(de)(de)气体会腐蚀泵(beng)，必(bi)须要用特殊的(de)(de)(de)材(cai)质(zhi)才(cai)能(neng)满(man)足需(xu)(xu)求(qiu)(qiu)。