无油式真空泵是一种旋(xuan)转式(shi)变容真空(kong)(kong)(kong)(kong)泵(beng)(beng)须(xu)有前(qian)级泵(beng)(beng)配合方可使用(yong)在较(jiao)宽的压(ya)力范围内有较(jiao)大的抽速对被抽除(chu)气(qi)体中含有灰尘和水(shui)(shui)(shui)蒸汽不(bu)敏感广泛用(yong)于冶(ye)金、化(hua)工(gong)、食品、电子镀膜等(deng)行(xing)业(ye)。主要有WLW系列立式(shi)无油真空(kong)(kong)(kong)(kong)泵(beng)(beng)、W型(xing)(xing)(xing)往复式(shi)真空(kong)(kong)(kong)(kong)泵(beng)(beng)、2X,2XZ型(xing)(xing)(xing)旋(xuan)片式(shi)真空(kong)(kong)(kong)(kong)泵(beng)(beng)、ZJ，ZJH型(xing)(xing)(xing)罗(luo)(luo)茨(ci)(ci)真空(kong)(kong)(kong)(kong)泵(beng)(beng)（ZJH型(xing)(xing)(xing)为专利(li)产真空(kong)(kong)(kong)(kong)泵(beng)(beng)品）、2SK、SK型(xing)(xing)(xing)水(shui)(shui)(shui)环(huan)式(shi)真空(kong)(kong)(kong)(kong)泵(beng)(beng)、2BV、2BA型(xing)(xing)(xing)水(shui)(shui)(shui)环(huan)式(shi)真空(kong)(kong)(kong)(kong)泵(beng)(beng)、H、2H型(xing)(xing)(xing)滑(hua)阀真空(kong)(kong)(kong)(kong)泵(beng)(beng)、TLZ型(xing)(xing)(xing)真空(kong)(kong)(kong)(kong)泵(beng)(beng)、SL型(xing)(xing)(xing)罗(luo)(luo)茨(ci)(ci)鼓风机(ji)、JZJHX型(xing)(xing)(xing)罗(luo)(luo)茨(ci)(ci)旋(xuan)片真空(kong)(kong)(kong)(kong)机(ji)组、JZJHS型(xing)(xing)(xing)罗(luo)(luo)茨(ci)(ci)水(shui)(shui)(shui)环(huan)真空(kong)(kong)(kong)(kong)机(ji)组、JZJHWLW型(xing)(xing)(xing)立式(shi)无油真空(kong)(kong)(kong)(kong)机(ji)组、JZJP型(xing)(xing)(xing)罗(luo)(luo)茨(ci)(ci)水(shui)(shui)(shui)喷(pen)射真空(kong)(kong)(kong)(kong)机(ji)组、JZJHBA型(xing)(xing)(xing)罗(luo)(luo)茨(ci)(ci)水(shui)(shui)(shui)环(huan)真空(kong)(kong)(kong)(kong)机(ji)组、RPP型(xing)(xing)(xing)水(shui)(shui)(shui)喷(pen)射真空(kong)(kong)(kong)(kong)泵(beng)(beng)、JZJH2H型(xing)(xing)(xing)罗(luo)(luo)茨(ci)(ci)滑(hua)阀式(shi)真空(kong)(kong)(kong)(kong)机(ji)组等(deng)型(xing)(xing)(xing)号(hao)。　　

　　工作原理：　

　　1.首先(xian)应(ying)(ying)该充分(fen)(fen)了解被抽(chou)气(qi)体成分(fen)(fen)。如气(qi)体中含不含可凝(ning)蒸(zheng)气(qi)、有(you)无(wu)颗粒(li)灰尘(chen)、有(you)无(wu)腐(fu)蚀性、爆炸性等。如果气(qi)体中含有(you)蒸(zheng)气(qi)、颗粒(li)、及腐(fu)蚀性气(qi)体，应(ying)(ying)该考虑在泵(beng)的(de)进气(qi)口(kou)管路上安装辅助设备，如冷凝(ning)器、除尘(chen)器等。如抽(chou)取气(qi)体还有(you)腐(fu)蚀性，则须选用材质。若抽(chou)取的(de)气(qi)体具(ju)有(you)爆炸性，则应(ying)(ying)该选择水环式(shi)真空泵(beng)并且配防爆电(dian)机，因为水环式(shi)真空泵(beng)整(zheng)个工(gong)作过程是等温的(de)。　　

　　2.真(zhen)空(kong)设(she)备或(huo)者(zhe)零部(bu)件对油污染的要(yao)求。若(ruo)设(she)备严(yan)格要(yao)求无(wu)油时，应(ying)该(gai)选各种无(wu)油泵，如：水环式真(zhen)空(kong)泵、分子筛吸附(fu)泵、溅射离子泵、低温(wen)泵等(deng)。若(ruo)要(yao)求不(bu)严(yan)格，可以选择有(you)油泵，并且加上一些(xie)防油污染措施，如加冷(leng)阱、障板、挡油阱等(deng)，也能达到(dao)清(qing)洁真(zhen)空(kong)要(yao)求。　　

　　3.真(zhen)空(kong)泵(beng)排出来的油蒸气(qi)对环境的影响如(ru)(ru)何。如(ru)(ru)果环境不允许(xu)有污(wu)染，可(ke)以选无油真(zhen)空(kong)泵(beng)如(ru)(ru)水(shui)环式真(zhen)空(kong)泵(beng)，或者把油蒸气(qi)排到室外。　　

　　4.如有多(duo)台大型水环式真空泵(beng)同时工作，循环液应该(gai)进行冷(leng)却(que)，否(fou)则影响真空度。冷(leng)却(que)装置可以配备冷(leng)却(que)塔，同时须配增压(ya)泵(beng)对管路加压(ya)。　

　　5.真空(kong)泵的工作压强(qiang)应该(gai)满足(zu)真空(kong)设备(bei)的极限真空(kong)及工作压强(qiang)要求。通(tong)常选择真空(kong)泵泵的真空(kong)度(du)要高于(yu)真空(kong)设备(bei)真空(kong)度(du)半个到(dao)一(yi)个数(shu)量级。　

　　6.真空(kong)泵(beng)在(zai)其(qi)工作压(ya)强下，应能排走真空(kong)设备工艺过程中产生的(de)全部气(qi)体量。

它具有结构简单(dan)、操作容易、维护方便、不会污染环境等优(you)点。无油真空(kong)(kong)(kong)泵(beng)(beng)耐用(yong)性(xing)好，是(shi)抽(chou)真空(kong)(kong)(kong)，压缩(suo)，两(liang)用(yong)真空(kong)(kong)(kong)泵(beng)(beng)，是(shi)一种应用(yong)范围非常广泛(fan)获(huo)得(de)真空(kong)(kong)(kong)的基(ji)本设(she)备。

无(wu)油(you)真空泵与油(you)泵相比真空度低(di)，抽(chou)气量小(xiao)(xiao)，但体积小(xiao)(xiao)巧，易(yi)于安装，维护简单，移动方(fang)便，不产(chan)生油(you)烟(yan)，不污染(ran)环境，尤其在要(yao)求(qiu)较高(gao)的(de)实验(yan)室(shi)使用较好。也是实验(yan)室(shi)最常备的(de)设备之一。

因此在选购无(wu)油真(zhen)(zhen)(zhen)空(kong)泵(beng)时(shi)要(yao)(yao)(yao)先确定要(yao)(yao)(yao)求(qiu)(qiu)(qiu)工作的真(zhen)(zhen)(zhen)空(kong)度，如果(guo)需(xu)求(qiu)(qiu)(qiu)的真(zhen)(zhen)(zhen)度高，而选的真(zhen)(zhen)(zhen)空(kong)泵(beng)就(jiu)要(yao)(yao)(yao)高于需(xu)求(qiu)(qiu)(qiu)的真(zhen)(zhen)(zhen)空(kong)度，否(fou)则(ze)达不(bu)(bu)到抽真(zhen)(zhen)(zhen)空(kong)的要(yao)(yao)(yao)求(qiu)(qiu)(qiu)，就(jiu)会(hui)达不(bu)(bu)到工作要(yao)(yao)(yao)求(qiu)(qiu)(qiu)。其(qi)次(ci)是无(wu)油真(zhen)(zhen)(zhen)空(kong)泵(beng)抽气速(su)率，选型时(shi)就(jiu)要(yao)(yao)(yao)稍大于所(suo)需(xu)求(qiu)(qiu)(qiu)的抽气速(su)率，这样(yang)就(jiu)能更好的满足需(xu)要(yao)(yao)(yao)。最后看抽取的气体有无(wu)腐(fu)蚀性，有腐(fu)蚀的气体会(hui)腐(fu)蚀泵(beng)，必须要(yao)(yao)(yao)用(yong)特(te)殊(shu)的材(cai)质(zhi)才能满足需(xu)求(qiu)(qiu)(qiu)。