電磁閥及氣缸等氣壓機器都有滑動部位，為了保證上述部位能長時間正常工作，必須對其進行潤滑。與油壓不同，氣壓本身不具備潤滑作用，所以，有必要將油混在空氣中進行輸送。目前，氣動控制閥，氣缸和氣馬達主要是靠這種帶有油霧的壓縮空氣來實現潤滑的，其優點是方便、干凈潤滑質量高。
油霧器是一種特殊的注油裝置。當壓縮空氣流過時，它將潤滑油噴射成霧狀，隨壓縮空氣一起流入需要潤滑的部件，達到潤滑的目的。
在氣動流體傳動系統中，動力是通過閉合回路中的壓縮空氣來傳遞和控制的。在空氣介質需要潤滑的場合，油霧器就是設計用以把需要的潤滑劑加入到空氣流中的元器件。
油霧器在選用時，應選用對合成橡膠密封材料的變形、硬化、軟化等影響很小的清潔潤滑油，粘度不宜過大或太小。油霧器在使用時必須及時補油，確保油面位于油霧器所規定的上下限之間。
日本SMC油(you)(you)霧(wu)器在(zai)氣(qi)(qi)(qi)動(dong)流(liu)體傳動(dong)系統(tong)中(zhong)(zhong)(zhong)(zhong)，動(dong)力是(shi)通過閉(bi)合(he)回路中(zhong)(zhong)(zhong)(zhong)的(de)(de)(de)壓(ya)縮(suo)空(kong)(kong)氣(qi)(qi)(qi)來傳遞和控制的(de)(de)(de)。在(zai)空(kong)(kong)氣(qi)(qi)(qi)介質需(xu)(xu)要(yao)潤(run)(run)滑(hua)(hua)(hua)的(de)(de)(de)場(chang)合(he)，就是(shi)設計用(yong)(yong)以把需(xu)(xu)要(yao)的(de)(de)(de)潤(run)(run)滑(hua)(hua)(hua)劑加(jia)入到(dao)空(kong)(kong)氣(qi)(qi)(qi)流(liu)中(zhong)(zhong)(zhong)(zhong)的(de)(de)(de)元(yuan)(yuan)器件(jian)(jian)。是(shi)一種特殊的(de)(de)(de)注油(you)(you)裝置，它將潤(run)(run)滑(hua)(hua)(hua)油(you)(you)進行(xing)霧(wu)化(hua)并(bing)注入空(kong)(kong)氣(qi)(qi)(qi)流(liu)中(zhong)(zhong)(zhong)(zhong)，隨壓(ya)縮(suo)空(kong)(kong)氣(qi)(qi)(qi)流(liu)入需(xu)(xu)要(yao)潤(run)(run)滑(hua)(hua)(hua)的(de)(de)(de)部(bu)位(wei)，達(da)到(dao)潤(run)(run)滑(hua)(hua)(hua)的(de)(de)(de)目(mu)的(de)(de)(de)。SMC電磁閥及SMC氣(qi)(qi)(qi)缸等氣(qi)(qi)(qi)壓(ya)機器都有滑(hua)(hua)(hua)動(dong)部(bu)位(wei)，為(wei)了保證上述(shu)部(bu)位(wei)能長時(shi)間(jian)正常工(gong)作(zuo)，必須對(dui)其進行(xing)潤(run)(run)滑(hua)(hua)(hua)。與油(you)(you)壓(ya)不(bu)同，氣(qi)(qi)(qi)壓(ya)本身不(bu)具備潤(run)(run)滑(hua)(hua)(hua)作(zuo)用(yong)(yong)，所以，有必要(yao)將油(you)(you)混在(zai)空(kong)(kong)氣(qi)(qi)(qi)中(zhong)(zhong)(zhong)(zhong)進行(xing)輸送(song)。目(mu)前，氣(qi)(qi)(qi)動(dong)控制閥，氣(qi)(qi)(qi)缸和氣(qi)(qi)(qi)馬達(da)主要(yao)是(shi)靠(kao)這種帶有油(you)(you)霧(wu)的(de)(de)(de)壓(ya)縮(suo)空(kong)(kong)氣(qi)(qi)(qi)來實現潤(run)(run)滑(hua)(hua)(hua)的(de)(de)(de)，其優點是(shi)方便、干凈潤(run)(run)滑(hua)(hua)(hua)質量高。一般用(yong)(yong)在(zai)氣(qi)(qi)(qi)動(dong)管路中(zhong)(zhong)(zhong)(zhong),將油(you)(you)霧(wu)化(hua)后和氣(qi)(qi)(qi)體一起送(song)入壓(ya)縮(suo)空(kong)(kong)氣(qi)(qi)(qi)管路中(zhong)(zhong)(zhong)(zhong)對(dui)氣(qi)(qi)(qi)動(dong)元(yuan)(yuan)件(jian)(jian)，如(ru)氣(qi)(qi)(qi)缸活塞(sai),換向閥等 起到(dao)潤(run)(run)滑(hua)(hua)(hua)設備的(de)(de)(de)作(zuo)用(yong)(yong)，確保正常工(gong)作(zuo),減少元(yuan)(yuan)件(jian)(jian)的(de)(de)(de)磨損.延長元(yuan)(yuan)件(jian)(jian)壽(shou)命。