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(luo)桿壓縮機(ji)分為單螺(luo)桿壓縮機(ji)和雙螺(luo)桿壓縮機(ji)，直到1934年瑞典皇家理工(gong)學院A.Lysholm才奠定了(le)(le)螺(luo)桿式(shi)壓縮機(ji)SRM技術，并開始在工(gong)業上應用，取得了(le)(le)迅速的發展。

雙螺(luo)桿(gan)主機(ji)做介紹，工作過(guo)程(cheng)(cheng)(cheng)：齒間(jian)基(ji)(ji)元(yuan)容(rong)(rong)積(ji)（即每對齒所(suo)形成的(de)工作容(rong)(rong)積(ji)）隨著轉(zhuan)子(zi)旋(xuan)轉(zhuan)而(er)逐步擴大，并和(he)機(ji)器左下方的(de)進(jin)氣(qi)(qi)(qi)(qi)(qi)孔口連通(tong)(tong)，氣(qi)(qi)(qi)(qi)(qi)體通(tong)(tong)過(guo)孔口進(jin)入(ru)(ru)基(ji)(ji)元(yuan)容(rong)(rong)積(ji)，進(jin)氣(qi)(qi)(qi)(qi)(qi)過(guo)程(cheng)(cheng)(cheng)開(kai)始(shi)(shi)；轉(zhuan)子(zi)旋(xuan)轉(zhuan)到一定角(jiao)(jiao)度后(hou)，齒間(jian)基(ji)(ji)元(yuan)容(rong)(rong)積(ji)超過(guo)進(jin)氣(qi)(qi)(qi)(qi)(qi)孔口位(wei)置后(hou)，與(yu)進(jin)氣(qi)(qi)(qi)(qi)(qi)孔口斷(duan)開(kai)，進(jin)氣(qi)(qi)(qi)(qi)(qi)過(guo)程(cheng)(cheng)(cheng)結束；轉(zhuan)子(zi)轉(zhuan)到某一角(jiao)(jiao)度后(hou)，兩個孤立的(de)齒間(jian)基(ji)(ji)元(yuan)容(rong)(rong)積(ji)由(you)于(yu)(yu)陽螺(luo)桿(gan)的(de)凸齒侵入(ru)(ru)陰(yin)螺(luo)桿(gan)的(de)凹齒，基(ji)(ji)元(yuan)容(rong)(rong)積(ji)同時開(kai)始(shi)(shi)縮(suo)小，實(shi)現氣(qi)(qi)(qi)(qi)(qi)體的(de)壓縮(suo)過(guo)程(cheng)(cheng)(cheng)。直(zhi)到一對基(ji)(ji)元(yuan)容(rong)(rong)積(ji)與(yu)排(pai)氣(qi)(qi)(qi)(qi)(qi)孔口相連通(tong)(tong)的(de)瞬間(jian)為止；基(ji)(ji)元(yuan)容(rong)(rong)積(ji)和(he)排(pai)氣(qi)(qi)(qi)(qi)(qi)孔口相連通(tong)(tong)后(hou)，排(pai)氣(qi)(qi)(qi)(qi)(qi)過(guo)程(cheng)(cheng)(cheng)開(kai)始(shi)(shi)，排(pai)氣(qi)(qi)(qi)(qi)(qi)過(guo)程(cheng)(cheng)(cheng)一直(zhi)持續到兩個齒完全嚙合(he)，即兩個基(ji)(ji)元(yuan)容(rong)(rong)積(ji)因(yin)兩個轉(zhuan)子(zi)完全嚙合(he)而(er)等(deng)于(yu)(yu)零時。