无油式真空泵是(shi)一(yi)种旋转(zhuan)式(shi)(shi)(shi)变容(rong)真(zhen)(zhen)空(kong)(kong)(kong)(kong)泵(beng)(beng)(beng)须有(you)前级(ji)泵(beng)(beng)(beng)配合方可使用在(zai)较(jiao)宽的压(ya)力(li)范(fan)围内有(you)较(jiao)大的抽速对被抽除(chu)气体中含(han)有(you)灰尘和水(shui)蒸汽不敏感广泛用于冶金、化(hua)工、食(shi)品、电子镀膜等行业(ye)。主要(yao)有(you)WLW系列立式(shi)(shi)(shi)无(wu)油真(zhen)(zhen)空(kong)(kong)(kong)(kong)泵(beng)(beng)(beng)、W型(xing)(xing)(xing)(xing)(xing)往复式(shi)(shi)(shi)真(zhen)(zhen)空(kong)(kong)(kong)(kong)泵(beng)(beng)(beng)、2X,2XZ型(xing)(xing)(xing)(xing)(xing)旋片式(shi)(shi)(shi)真(zhen)(zhen)空(kong)(kong)(kong)(kong)泵(beng)(beng)(beng)、ZJ，ZJH型(xing)(xing)(xing)(xing)(xing)罗(luo)茨真(zhen)(zhen)空(kong)(kong)(kong)(kong)泵(beng)(beng)(beng)（ZJH型(xing)(xing)(xing)(xing)(xing)为专(zhuan)利产真(zhen)(zhen)空(kong)(kong)(kong)(kong)泵(beng)(beng)(beng)品）、2SK、SK型(xing)(xing)(xing)(xing)(xing)水(shui)环(huan)式(shi)(shi)(shi)真(zhen)(zhen)空(kong)(kong)(kong)(kong)泵(beng)(beng)(beng)、2BV、2BA型(xing)(xing)(xing)(xing)(xing)水(shui)环(huan)式(shi)(shi)(shi)真(zhen)(zhen)空(kong)(kong)(kong)(kong)泵(beng)(beng)(beng)、H、2H型(xing)(xing)(xing)(xing)(xing)滑(hua)(hua)阀(fa)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)茨鼓(gu)风机、JZJHX型(xing)(xing)(xing)(xing)(xing)罗(luo)茨旋片真(zhen)(zhen)空(kong)(kong)(kong)(kong)机组(zu)、JZJHS型(xing)(xing)(xing)(xing)(xing)罗(luo)茨水(shui)环(huan)真(zhen)(zhen)空(kong)(kong)(kong)(kong)机组(zu)、JZJHWLW型(xing)(xing)(xing)(xing)(xing)立式(shi)(shi)(shi)无(wu)油真(zhen)(zhen)空(kong)(kong)(kong)(kong)机组(zu)、JZJP型(xing)(xing)(xing)(xing)(xing)罗(luo)茨水(shui)喷射真(zhen)(zhen)空(kong)(kong)(kong)(kong)机组(zu)、JZJHBA型(xing)(xing)(xing)(xing)(xing)罗(luo)茨水(shui)环(huan)真(zhen)(zhen)空(kong)(kong)(kong)(kong)机组(zu)、RPP型(xing)(xing)(xing)(xing)(xing)水(shui)喷射真(zhen)(zhen)空(kong)(kong)(kong)(kong)泵(beng)(beng)(beng)、JZJH2H型(xing)(xing)(xing)(xing)(xing)罗(luo)茨滑(hua)(hua)阀(fa)式(shi)(shi)(shi)真(zhen)(zhen)空(kong)(kong)(kong)(kong)机组(zu)等型(xing)(xing)(xing)(xing)(xing)号(hao)。　　

　　工作原理：　

　　1.首先应(ying)(ying)该(gai)充分了(le)解被抽气(qi)(qi)(qi)体(ti)成分。如(ru)气(qi)(qi)(qi)体(ti)中含不含可凝(ning)蒸气(qi)(qi)(qi)、有无(wu)颗粒(li)灰尘、有无(wu)腐(fu)蚀(shi)性、爆炸(zha)性等。如(ru)果气(qi)(qi)(qi)体(ti)中含有蒸气(qi)(qi)(qi)、颗粒(li)、及腐(fu)蚀(shi)性气(qi)(qi)(qi)体(ti)，应(ying)(ying)该(gai)考虑在泵的(de)(de)进气(qi)(qi)(qi)口管路上安装(zhuang)辅助设(she)备(bei)，如(ru)冷(leng)凝(ning)器(qi)、除(chu)尘器(qi)等。如(ru)抽取气(qi)(qi)(qi)体(ti)还有腐(fu)蚀(shi)性，则须选(xuan)用材质。若抽取的(de)(de)气(qi)(qi)(qi)体(ti)具(ju)有爆炸(zha)性，则应(ying)(ying)该(gai)选(xuan)择水(shui)环(huan)(huan)式真空泵并且配防爆电机，因为水(shui)环(huan)(huan)式真空泵整个(ge)工作(zuo)过程是等温的(de)(de)。　　

　　2.真空(kong)设备(bei)或者零部件对油(you)(you)污(wu)染(ran)的要求(qiu)(qiu)(qiu)。若设备(bei)严(yan)格(ge)(ge)要求(qiu)(qiu)(qiu)无油(you)(you)时，应该选各种无油(you)(you)泵(beng)，如：水环式真空(kong)泵(beng)、分子筛(shai)吸附泵(beng)、溅射离子泵(beng)、低温泵(beng)等。若要求(qiu)(qiu)(qiu)不严(yan)格(ge)(ge)，可以选择有油(you)(you)泵(beng)，并且加(jia)上一些防油(you)(you)污(wu)染(ran)措施(shi)，如加(jia)冷阱、障板、挡油(you)(you)阱等，也能达到清洁真空(kong)要求(qiu)(qiu)(qiu)。　　

　　3.真(zhen)空泵(beng)排出来的油蒸气对环境(jing)的影响(xiang)如何。如果环境(jing)不允许(xu)有污染，可(ke)以选无(wu)油真(zhen)空泵(beng)如水(shui)环式(shi)真(zhen)空泵(beng)，或者把油蒸气排到室外(wai)。　　

　　4.如有多台大(da)型水(shui)环(huan)式(shi)真空(kong)泵同时工作，循环(huan)液应(ying)该进行冷却(que)，否(fou)则影(ying)响真空(kong)度。冷却(que)装置可以(yi)配备冷却(que)塔，同时须配增压(ya)泵对管路加压(ya)。　

　　5.真(zhen)(zhen)(zhen)空泵(beng)的工(gong)作压强应该满足真(zhen)(zhen)(zhen)空设备(bei)(bei)的极限真(zhen)(zhen)(zhen)空及工(gong)作压强要(yao)求(qiu)。通常选择真(zhen)(zhen)(zhen)空泵(beng)泵(beng)的真(zhen)(zhen)(zhen)空度要(yao)高于真(zhen)(zhen)(zhen)空设备(bei)(bei)真(zhen)(zhen)(zhen)空度半个(ge)到一个(ge)数(shu)量级(ji)。　

　　6.真(zhen)空泵在其工作压强(qiang)下，应能排走真(zhen)空设备工艺过程中产生的全部气体量。

它具有结(jie)构简单、操作容易、维护方便、不(bu)会污染环境等优点。无油真(zhen)空泵(beng)耐用(yong)性好，是抽真(zhen)空，压缩，两(liang)用(yong)真(zhen)空泵(beng)，是一种应用(yong)范(fan)围(wei)非常(chang)广泛获得真(zhen)空的基本(ben)设备。

无油真(zhen)空泵与油泵相比真(zhen)空度低(di)，抽气量小(xiao)，但体积小(xiao)巧(qiao)，易于(yu)安装，维护简(jian)单，移(yi)动方便，不(bu)产生油烟，不(bu)污染环境，尤其在要求较高的实验(yan)室使用(yong)较好。也是实验(yan)室最常备的设备之一。

因此在选购无油(you)真空泵时要(yao)(yao)先(xian)确定要(yao)(yao)求(qiu)工作(zuo)的(de)(de)(de)真空度，如果需(xu)(xu)(xu)求(qiu)的(de)(de)(de)真度高(gao)，而选的(de)(de)(de)真空泵就(jiu)要(yao)(yao)高(gao)于需(xu)(xu)(xu)求(qiu)的(de)(de)(de)真空度，否则达不到(dao)抽(chou)真空的(de)(de)(de)要(yao)(yao)求(qiu)，就(jiu)会达不到(dao)工作(zuo)要(yao)(yao)求(qiu)。其次是无油(you)真空泵抽(chou)气(qi)(qi)速(su)(su)率，选型时就(jiu)要(yao)(yao)稍大于所需(xu)(xu)(xu)求(qiu)的(de)(de)(de)抽(chou)气(qi)(qi)速(su)(su)率，这样就(jiu)能更好的(de)(de)(de)满足(zu)需(xu)(xu)(xu)要(yao)(yao)。最后看抽(chou)取的(de)(de)(de)气(qi)(qi)体有无腐蚀(shi)性，有腐蚀(shi)的(de)(de)(de)气(qi)(qi)体会腐蚀(shi)泵，必(bi)须要(yao)(yao)用(yong)特殊的(de)(de)(de)材(cai)质才能满足(zu)需(xu)(xu)(xu)求(qiu)。