无油式真空泵是一种旋(xuan)转式(shi)(shi)变容真(zhen)(zhen)(zhen)空(kong)(kong)(kong)(kong)(kong)泵(beng)(beng)须有前(qian)级泵(beng)(beng)配合方(fang)可(ke)使(shi)用(yong)在较宽的(de)压力范围内有较大的(de)抽速对被(bei)抽除气体中含有灰(hui)尘和水(shui)蒸汽不敏感(gan)广泛用(yong)于冶金(jin)、化工、食(shi)品(pin)、电子镀膜等(deng)行业。主要有WLW系列立式(shi)(shi)无油(you)真(zhen)(zhen)(zhen)空(kong)(kong)(kong)(kong)(kong)泵(beng)(beng)、W型(xing)(xing)(xing)(xing)往复(fu)式(shi)(shi)真(zhen)(zhen)(zhen)空(kong)(kong)(kong)(kong)(kong)泵(beng)(beng)、2X,2XZ型(xing)(xing)(xing)(xing)旋(xuan)片(pian)式(shi)(shi)真(zhen)(zhen)(zhen)空(kong)(kong)(kong)(kong)(kong)泵(beng)(beng)、ZJ，ZJH型(xing)(xing)(xing)(xing)罗茨(ci)(ci)真(zhen)(zhen)(zhen)空(kong)(kong)(kong)(kong)(kong)泵(beng)(beng)（ZJH型(xing)(xing)(xing)(xing)为专利(li)产(chan)真(zhen)(zhen)(zhen)空(kong)(kong)(kong)(kong)(kong)泵(beng)(beng)品(pin)）、2SK、SK型(xing)(xing)(xing)(xing)水(shui)环(huan)式(shi)(shi)真(zhen)(zhen)(zhen)空(kong)(kong)(kong)(kong)(kong)泵(beng)(beng)、2BV、2BA型(xing)(xing)(xing)(xing)水(shui)环(huan)式(shi)(shi)真(zhen)(zhen)(zhen)空(kong)(kong)(kong)(kong)(kong)泵(beng)(beng)、H、2H型(xing)(xing)(xing)(xing)滑阀真(zhen)(zhen)(zhen)空(kong)(kong)(kong)(kong)(kong)泵(beng)(beng)、TLZ型(xing)(xing)(xing)(xing)真(zhen)(zhen)(zhen)空(kong)(kong)(kong)(kong)(kong)泵(beng)(beng)、SL型(xing)(xing)(xing)(xing)罗茨(ci)(ci)鼓(gu)风(feng)机(ji)(ji)、JZJHX型(xing)(xing)(xing)(xing)罗茨(ci)(ci)旋(xuan)片(pian)真(zhen)(zhen)(zhen)空(kong)(kong)(kong)(kong)(kong)机(ji)(ji)组(zu)(zu)(zu)、JZJHS型(xing)(xing)(xing)(xing)罗茨(ci)(ci)水(shui)环(huan)真(zhen)(zhen)(zhen)空(kong)(kong)(kong)(kong)(kong)机(ji)(ji)组(zu)(zu)(zu)、JZJHWLW型(xing)(xing)(xing)(xing)立式(shi)(shi)无油(you)真(zhen)(zhen)(zhen)空(kong)(kong)(kong)(kong)(kong)机(ji)(ji)组(zu)(zu)(zu)、JZJP型(xing)(xing)(xing)(xing)罗茨(ci)(ci)水(shui)喷射(she)真(zhen)(zhen)(zhen)空(kong)(kong)(kong)(kong)(kong)机(ji)(ji)组(zu)(zu)(zu)、JZJHBA型(xing)(xing)(xing)(xing)罗茨(ci)(ci)水(shui)环(huan)真(zhen)(zhen)(zhen)空(kong)(kong)(kong)(kong)(kong)机(ji)(ji)组(zu)(zu)(zu)、RPP型(xing)(xing)(xing)(xing)水(shui)喷射(she)真(zhen)(zhen)(zhen)空(kong)(kong)(kong)(kong)(kong)泵(beng)(beng)、JZJH2H型(xing)(xing)(xing)(xing)罗茨(ci)(ci)滑阀式(shi)(shi)真(zhen)(zhen)(zhen)空(kong)(kong)(kong)(kong)(kong)机(ji)(ji)组(zu)(zu)(zu)等(deng)型(xing)(xing)(xing)(xing)号。　　

　　工作原理：　

　　1.首先应该充(chong)分了(le)解(jie)被抽气(qi)(qi)(qi)体成分。如气(qi)(qi)(qi)体中(zhong)含(han)(han)不含(han)(han)可凝蒸(zheng)气(qi)(qi)(qi)、有(you)无颗粒灰尘(chen)、有(you)无腐蚀(shi)性(xing)、爆(bao)炸性(xing)等。如果(guo)气(qi)(qi)(qi)体中(zhong)含(han)(han)有(you)蒸(zheng)气(qi)(qi)(qi)、颗粒、及(ji)腐蚀(shi)性(xing)气(qi)(qi)(qi)体，应该考虑在(zai)泵的进气(qi)(qi)(qi)口(kou)管路上安(an)装(zhuang)辅助设备，如冷凝器、除尘(chen)器等。如抽取(qu)气(qi)(qi)(qi)体还有(you)腐蚀(shi)性(xing)，则须选用材(cai)质。若(ruo)抽取(qu)的气(qi)(qi)(qi)体具有(you)爆(bao)炸性(xing)，则应该选择水(shui)环式真空(kong)(kong)泵并且(qie)配防爆(bao)电(dian)机(ji)，因为水(shui)环式真空(kong)(kong)泵整个工(gong)作过程是(shi)等温的。　　

　　2.真空(kong)设(she)备(bei)或者零部(bu)件(jian)对油(you)(you)污染的要(yao)求(qiu)。若设(she)备(bei)严格要(yao)求(qiu)无油(you)(you)时，应该(gai)选各种(zhong)无油(you)(you)泵(beng)(beng)，如(ru)：水(shui)环(huan)式(shi)真空(kong)泵(beng)(beng)、分(fen)子筛吸附泵(beng)(beng)、溅射(she)离子泵(beng)(beng)、低温泵(beng)(beng)等。若要(yao)求(qiu)不(bu)严格，可以选择有油(you)(you)泵(beng)(beng)，并(bing)且(qie)加上一些防油(you)(you)污染措(cuo)施(shi)，如(ru)加冷阱(jing)、障板、挡油(you)(you)阱(jing)等，也能达(da)到(dao)清(qing)洁真空(kong)要(yao)求(qiu)。　　

　　3.真(zhen)空(kong)泵排出来(lai)的(de)油蒸(zheng)气对环(huan)(huan)境(jing)的(de)影响如何。如果环(huan)(huan)境(jing)不允许有污染，可以选(xuan)无油真(zhen)空(kong)泵如水环(huan)(huan)式真(zhen)空(kong)泵，或者(zhe)把油蒸(zheng)气排到室(shi)外(wai)。　　

　　4.如(ru)有多(duo)台(tai)大型水环式真空(kong)泵(beng)同时工(gong)作，循环液应该进行冷(leng)却(que)，否则影(ying)响真空(kong)度。冷(leng)却(que)装(zhuang)置可(ke)以配备冷(leng)却(que)塔，同时须配增压泵(beng)对管路加(jia)压。　

　　5.真(zhen)空(kong)泵(beng)的(de)工(gong)作(zuo)压强应该满足真(zhen)空(kong)设备的(de)极限真(zhen)空(kong)及工(gong)作(zuo)压强要求。通(tong)常(chang)选择真(zhen)空(kong)泵(beng)泵(beng)的(de)真(zhen)空(kong)度要高(gao)于真(zhen)空(kong)设备真(zhen)空(kong)度半个到一个数量级。　

　　6.真空泵在其工作压强下，应能排(pai)走真空设(she)备工艺过程中(zhong)产生的全部(bu)气体量。

它具有结(jie)构(gou)简单、操作容易、维(wei)护方便、不(bu)会污染环境等优点。无(wu)油真空(kong)(kong)泵耐用性好，是(shi)抽真空(kong)(kong)，压(ya)缩，两用真空(kong)(kong)泵，是(shi)一种应(ying)用范围非常广(guang)泛获得(de)真空(kong)(kong)的基(ji)本设(she)备(bei)。

无油(you)真空(kong)泵与(yu)油(you)泵相比真空(kong)度(du)低，抽气量小，但体积(ji)小巧(qiao)，易于安装，维(wei)护(hu)简单，移动(dong)方便，不(bu)产生油(you)烟，不(bu)污染(ran)环境，尤其在要(yao)求较高的实验室使用较好。也是实验室最(zui)常备(bei)的设备(bei)之一。

因此在选购无(wu)油(you)真空(kong)泵(beng)(beng)时要(yao)(yao)先确定要(yao)(yao)求(qiu)(qiu)工作(zuo)的(de)(de)真空(kong)度(du)，如果需求(qiu)(qiu)的(de)(de)真度(du)高(gao)，而(er)选的(de)(de)真空(kong)泵(beng)(beng)就(jiu)要(yao)(yao)高(gao)于(yu)需求(qiu)(qiu)的(de)(de)真空(kong)度(du)，否则达不(bu)到(dao)抽(chou)(chou)真空(kong)的(de)(de)要(yao)(yao)求(qiu)(qiu)，就(jiu)会达不(bu)到(dao)工作(zuo)要(yao)(yao)求(qiu)(qiu)。其次是(shi)无(wu)油(you)真空(kong)泵(beng)(beng)抽(chou)(chou)气速(su)率，选型时就(jiu)要(yao)(yao)稍大于(yu)所需求(qiu)(qiu)的(de)(de)抽(chou)(chou)气速(su)率，这(zhei)样就(jiu)能更好的(de)(de)满足需要(yao)(yao)。最后(hou)看抽(chou)(chou)取的(de)(de)气体有无(wu)腐蚀(shi)(shi)性，有腐蚀(shi)(shi)的(de)(de)气体会腐蚀(shi)(shi)泵(beng)(beng)，必须要(yao)(yao)用特殊的(de)(de)材质才能满足需求(qiu)(qiu)。