螺桿壓縮機，也稱螺旋式壓縮機，包括螺桿空氣壓縮機和螺桿工藝壓縮機（氯乙烯壓縮機等），螺桿機為容積式雙螺桿噴油壓縮機，一般為箱式撬裝結構。

螺桿壓(ya)縮(suo)(suo)機(ji)分為(wei)單螺桿壓(ya)縮(suo)(suo)機(ji)和雙螺桿壓(ya)縮(suo)(suo)機(ji)，直到1934年瑞典皇家理(li)工學(xue)院A.Lysholm才奠定了螺桿式壓(ya)縮(suo)(suo)機(ji)SRM技術(shu)，并開(kai)始在工業上應(ying)用(yong)，取得了迅速的發展。

雙螺桿(gan)主機(ji)做介紹，工作過(guo)程(cheng)：齒(chi)(chi)間(jian)(jian)基(ji)(ji)元(yuan)(yuan)(yuan)(yuan)容(rong)(rong)積(ji)（即每對齒(chi)(chi)所(suo)形(xing)成的工作容(rong)(rong)積(ji)）隨著(zhu)轉(zhuan)(zhuan)子旋轉(zhuan)(zhuan)而逐(zhu)步擴大，并(bing)和機(ji)器左下方的進氣(qi)(qi)孔(kong)(kong)口連通(tong)，氣(qi)(qi)體通(tong)過(guo)孔(kong)(kong)口進入基(ji)(ji)元(yuan)(yuan)(yuan)(yuan)容(rong)(rong)積(ji)，進氣(qi)(qi)過(guo)程(cheng)開(kai)始(shi)；轉(zhuan)(zhuan)子旋轉(zhuan)(zhuan)到(dao)一定角(jiao)度后，齒(chi)(chi)間(jian)(jian)基(ji)(ji)元(yuan)(yuan)(yuan)(yuan)容(rong)(rong)積(ji)超過(guo)進氣(qi)(qi)孔(kong)(kong)口位(wei)置后，與進氣(qi)(qi)孔(kong)(kong)口斷(duan)開(kai)，進氣(qi)(qi)過(guo)程(cheng)結束(shu)；轉(zhuan)(zhuan)子轉(zhuan)(zhuan)到(dao)某(mou)一角(jiao)度后，兩個(ge)孤立的齒(chi)(chi)間(jian)(jian)基(ji)(ji)元(yuan)(yuan)(yuan)(yuan)容(rong)(rong)積(ji)由(you)于陽螺桿(gan)的凸齒(chi)(chi)侵入陰螺桿(gan)的凹齒(chi)(chi)，基(ji)(ji)元(yuan)(yuan)(yuan)(yuan)容(rong)(rong)積(ji)同(tong)時開(kai)始(shi)縮小，實現氣(qi)(qi)體的壓縮過(guo)程(cheng)。直到(dao)一對基(ji)(ji)元(yuan)(yuan)(yuan)(yuan)容(rong)(rong)積(ji)與排(pai)氣(qi)(qi)孔(kong)(kong)口相(xiang)連通(tong)的瞬(shun)間(jian)(jian)為止；基(ji)(ji)元(yuan)(yuan)(yuan)(yuan)容(rong)(rong)積(ji)和排(pai)氣(qi)(qi)孔(kong)(kong)口相(xiang)連通(tong)后，排(pai)氣(qi)(qi)過(guo)程(cheng)開(kai)始(shi)，排(pai)氣(qi)(qi)過(guo)程(cheng)一直持續到(dao)兩個(ge)齒(chi)(chi)完全嚙合(he)，即兩個(ge)基(ji)(ji)元(yuan)(yuan)(yuan)(yuan)容(rong)(rong)積(ji)因兩個(ge)轉(zhuan)(zhuan)子完全嚙合(he)而等于零(ling)時。