无油式真空泵是(shi)一种旋(xuan)转式变容真(zhen)空(kong)(kong)(kong)(kong)泵(beng)(beng)(beng)(beng)须有(you)前级泵(beng)(beng)(beng)(beng)配合方可使用(yong)在较宽的压力范(fan)围内(nei)有(you)较大的抽速(su)对(dui)被抽除气(qi)体中(zhong)含有(you)灰尘(chen)和水(shui)(shui)蒸汽不敏感广泛用(yong)于冶(ye)金(jin)、化工、食品、电子镀膜(mo)等行业。主要有(you)WLW系(xi)列立(li)式无(wu)油真(zhen)空(kong)(kong)(kong)(kong)泵(beng)(beng)(beng)(beng)、W型(xing)(xing)(xing)(xing)(xing)(xing)往(wang)复式真(zhen)空(kong)(kong)(kong)(kong)泵(beng)(beng)(beng)(beng)、2X,2XZ型(xing)(xing)(xing)(xing)(xing)(xing)旋(xuan)片式真(zhen)空(kong)(kong)(kong)(kong)泵(beng)(beng)(beng)(beng)、ZJ，ZJH型(xing)(xing)(xing)(xing)(xing)(xing)罗(luo)茨真(zhen)空(kong)(kong)(kong)(kong)泵(beng)(beng)(beng)(beng)（ZJH型(xing)(xing)(xing)(xing)(xing)(xing)为专利产(chan)真(zhen)空(kong)(kong)(kong)(kong)泵(beng)(beng)(beng)(beng)品）、2SK、SK型(xing)(xing)(xing)(xing)(xing)(xing)水(shui)(shui)环(huan)式真(zhen)空(kong)(kong)(kong)(kong)泵(beng)(beng)(beng)(beng)、2BV、2BA型(xing)(xing)(xing)(xing)(xing)(xing)水(shui)(shui)环(huan)式真(zhen)空(kong)(kong)(kong)(kong)泵(beng)(beng)(beng)(beng)、H、2H型(xing)(xing)(xing)(xing)(xing)(xing)滑(hua)阀(fa)真(zhen)空(kong)(kong)(kong)(kong)泵(beng)(beng)(beng)(beng)、TLZ型(xing)(xing)(xing)(xing)(xing)(xing)真(zhen)空(kong)(kong)(kong)(kong)泵(beng)(beng)(beng)(beng)、SL型(xing)(xing)(xing)(xing)(xing)(xing)罗(luo)茨鼓风机、JZJHX型(xing)(xing)(xing)(xing)(xing)(xing)罗(luo)茨旋(xuan)片真(zhen)空(kong)(kong)(kong)(kong)机组(zu)(zu)、JZJHS型(xing)(xing)(xing)(xing)(xing)(xing)罗(luo)茨水(shui)(shui)环(huan)真(zhen)空(kong)(kong)(kong)(kong)机组(zu)(zu)、JZJHWLW型(xing)(xing)(xing)(xing)(xing)(xing)立(li)式无(wu)油真(zhen)空(kong)(kong)(kong)(kong)机组(zu)(zu)、JZJP型(xing)(xing)(xing)(xing)(xing)(xing)罗(luo)茨水(shui)(shui)喷射真(zhen)空(kong)(kong)(kong)(kong)机组(zu)(zu)、JZJHBA型(xing)(xing)(xing)(xing)(xing)(xing)罗(luo)茨水(shui)(shui)环(huan)真(zhen)空(kong)(kong)(kong)(kong)机组(zu)(zu)、RPP型(xing)(xing)(xing)(xing)(xing)(xing)水(shui)(shui)喷射真(zhen)空(kong)(kong)(kong)(kong)泵(beng)(beng)(beng)(beng)、JZJH2H型(xing)(xing)(xing)(xing)(xing)(xing)罗(luo)茨滑(hua)阀(fa)式真(zhen)空(kong)(kong)(kong)(kong)机组(zu)(zu)等型(xing)(xing)(xing)(xing)(xing)(xing)号。　　

　　工作原理：　

　　1.首先应(ying)该(gai)(gai)充分(fen)了解被(bei)抽气(qi)(qi)体成分(fen)。如气(qi)(qi)体中(zhong)含不含可凝蒸气(qi)(qi)、有(you)无颗粒(li)灰尘、有(you)无腐蚀性、爆(bao)炸性等。如果(guo)气(qi)(qi)体中(zhong)含有(you)蒸气(qi)(qi)、颗粒(li)、及(ji)腐蚀性气(qi)(qi)体，应(ying)该(gai)(gai)考虑(lv)在泵的进气(qi)(qi)口管路上安装辅助设备，如冷凝器、除尘器等。如抽取气(qi)(qi)体还有(you)腐蚀性，则须选用(yong)材质。若抽取的气(qi)(qi)体具有(you)爆(bao)炸性，则应(ying)该(gai)(gai)选择水环(huan)式真(zhen)空泵并且配防(fang)爆(bao)电机，因为(wei)水环(huan)式真(zhen)空泵整个工作(zuo)过程(cheng)是等温的。　　

　　2.真空设(she)备或者零部件对油污(wu)染的要(yao)求(qiu)。若(ruo)(ruo)设(she)备严格要(yao)求(qiu)无油时，应该选(xuan)(xuan)各种(zhong)无油泵(beng)，如：水环式真空泵(beng)、分子筛吸附(fu)泵(beng)、溅射离子泵(beng)、低温(wen)泵(beng)等。若(ruo)(ruo)要(yao)求(qiu)不严格，可以选(xuan)(xuan)择有油泵(beng)，并且加(jia)上一(yi)些防油污(wu)染措施，如加(jia)冷阱(jing)、障板、挡(dang)油阱(jing)等，也能达到清(qing)洁真空要(yao)求(qiu)。　　

　　3.真空泵排出来的油(you)蒸气(qi)(qi)对(dui)环(huan)境的影响如(ru)(ru)何。如(ru)(ru)果(guo)环(huan)境不(bu)允许有污染，可以(yi)选无油(you)真空泵如(ru)(ru)水(shui)环(huan)式真空泵，或者(zhe)把油(you)蒸气(qi)(qi)排到室外。　　

　　4.如有(you)多台大型水环(huan)(huan)式真空(kong)泵同时(shi)工(gong)作，循环(huan)(huan)液(ye)应该进行冷却(que)，否则影(ying)响真空(kong)度。冷却(que)装置可以配备(bei)冷却(que)塔(ta)，同时(shi)须配增压泵对管路(lu)加压。　

　　5.真(zhen)(zhen)空(kong)泵的(de)工作压强(qiang)应该满(man)足真(zhen)(zhen)空(kong)设备的(de)极限真(zhen)(zhen)空(kong)及工作压强(qiang)要(yao)求。通常选择真(zhen)(zhen)空(kong)泵泵的(de)真(zhen)(zhen)空(kong)度(du)要(yao)高于真(zhen)(zhen)空(kong)设备真(zhen)(zhen)空(kong)度(du)半个到(dao)一个数量级。　

　　6.真(zhen)空(kong)泵在其工作压强下(xia)，应能排走(zou)真(zhen)空(kong)设备工艺(yi)过程中产生的全部气体量。

它具有结构简单、操作容易、维(wei)护方便、不会污(wu)染环境等优点。无油真(zhen)(zhen)(zhen)空(kong)(kong)泵(beng)耐用性好，是抽真(zhen)(zhen)(zhen)空(kong)(kong)，压(ya)缩，两用真(zhen)(zhen)(zhen)空(kong)(kong)泵(beng)，是一种(zhong)应用范围非(fei)常广泛获得真(zhen)(zhen)(zhen)空(kong)(kong)的基本设备(bei)。

无油(you)真空(kong)泵与油(you)泵相比(bi)真空(kong)度低，抽(chou)气量(liang)小，但体积小巧(qiao)，易于安装，维(wei)护简单，移(yi)动方便，不产生(sheng)油(you)烟，不污染环境，尤其在要(yao)求较高的实验(yan)室使用较好。也是(shi)实验(yan)室最(zui)常(chang)备的设备之(zhi)一。

因此在选购无(wu)油(you)真空(kong)泵(beng)时要先确定要求(qiu)(qiu)(qiu)工(gong)作的(de)(de)真空(kong)度(du)(du)，如果(guo)需求(qiu)(qiu)(qiu)的(de)(de)真度(du)(du)高，而选的(de)(de)真空(kong)泵(beng)就(jiu)要高于需求(qiu)(qiu)(qiu)的(de)(de)真空(kong)度(du)(du)，否则达不到(dao)抽真空(kong)的(de)(de)要求(qiu)(qiu)(qiu)，就(jiu)会达不到(dao)工(gong)作要求(qiu)(qiu)(qiu)。其次是(shi)无(wu)油(you)真空(kong)泵(beng)抽气速(su)率(lv)，选型(xing)时就(jiu)要稍(shao)大于所需求(qiu)(qiu)(qiu)的(de)(de)抽气速(su)率(lv)，这样就(jiu)能更(geng)好的(de)(de)满(man)(man)足需要。最(zui)后看(kan)抽取的(de)(de)气体有无(wu)腐蚀性(xing)，有腐蚀的(de)(de)气体会腐蚀泵(beng)，必须要用特(te)殊的(de)(de)材质才能满(man)(man)足需求(qiu)(qiu)(qiu)。