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(gan)壓縮機分為單螺桿(gan)壓縮機和雙(shuang)螺桿(gan)壓縮機，直到1934年瑞典皇家理(li)工(gong)學院(yuan)A.Lysholm才奠(dian)定了(le)螺桿(gan)式壓縮機SRM技術，并開始在工(gong)業(ye)上(shang)應用，取得了(le)迅速的發展。

雙螺桿主機做介紹，工作過(guo)(guo)(guo)(guo)程：齒(chi)(chi)間(jian)(jian)(jian)基(ji)(ji)元(yuan)(yuan)容(rong)(rong)(rong)積(ji)(ji)（即(ji)每對齒(chi)(chi)所形(xing)成(cheng)的(de)工作容(rong)(rong)(rong)積(ji)(ji)）隨著轉(zhuan)(zhuan)子(zi)(zi)(zi)旋轉(zhuan)(zhuan)而(er)逐步擴大，并和機器(qi)左下方的(de)進氣(qi)(qi)(qi)孔口連通(tong)，氣(qi)(qi)(qi)體通(tong)過(guo)(guo)(guo)(guo)孔口進入基(ji)(ji)元(yuan)(yuan)容(rong)(rong)(rong)積(ji)(ji)，進氣(qi)(qi)(qi)過(guo)(guo)(guo)(guo)程開始(shi)；轉(zhuan)(zhuan)子(zi)(zi)(zi)旋轉(zhuan)(zhuan)到(dao)一(yi)定角度后(hou)，齒(chi)(chi)間(jian)(jian)(jian)基(ji)(ji)元(yuan)(yuan)容(rong)(rong)(rong)積(ji)(ji)超過(guo)(guo)(guo)(guo)進氣(qi)(qi)(qi)孔口位(wei)置后(hou)，與進氣(qi)(qi)(qi)孔口斷(duan)開，進氣(qi)(qi)(qi)過(guo)(guo)(guo)(guo)程結束；轉(zhuan)(zhuan)子(zi)(zi)(zi)轉(zhuan)(zhuan)到(dao)某一(yi)角度后(hou)，兩個孤立的(de)齒(chi)(chi)間(jian)(jian)(jian)基(ji)(ji)元(yuan)(yuan)容(rong)(rong)(rong)積(ji)(ji)由于陽螺桿的(de)凸齒(chi)(chi)侵入陰螺桿的(de)凹(ao)齒(chi)(chi)，基(ji)(ji)元(yuan)(yuan)容(rong)(rong)(rong)積(ji)(ji)同(tong)時(shi)開始(shi)縮小，實現氣(qi)(qi)(qi)體的(de)壓縮過(guo)(guo)(guo)(guo)程。直(zhi)到(dao)一(yi)對基(ji)(ji)元(yuan)(yuan)容(rong)(rong)(rong)積(ji)(ji)與排(pai)氣(qi)(qi)(qi)孔口相(xiang)連通(tong)的(de)瞬(shun)間(jian)(jian)(jian)為止(zhi)；基(ji)(ji)元(yuan)(yuan)容(rong)(rong)(rong)積(ji)(ji)和排(pai)氣(qi)(qi)(qi)孔口相(xiang)連通(tong)后(hou)，排(pai)氣(qi)(qi)(qi)過(guo)(guo)(guo)(guo)程開始(shi)，排(pai)氣(qi)(qi)(qi)過(guo)(guo)(guo)(guo)程一(yi)直(zhi)持續到(dao)兩個齒(chi)(chi)完(wan)全(quan)嚙合(he)，即(ji)兩個基(ji)(ji)元(yuan)(yuan)容(rong)(rong)(rong)積(ji)(ji)因(yin)兩個轉(zhuan)(zhuan)子(zi)(zi)(zi)完(wan)全(quan)嚙合(he)而(er)等于零時(shi)。