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(ya)(ya)(ya)縮機分為單螺(luo)桿壓(ya)(ya)(ya)縮機和雙螺(luo)桿壓(ya)(ya)(ya)縮機，直到1934年瑞典皇家理工(gong)學(xue)院A.Lysholm才奠定了螺(luo)桿式壓(ya)(ya)(ya)縮機SRM技術，并開始在工(gong)業(ye)上應用，取得(de)了迅速的(de)發展。

雙螺(luo)桿主機(ji)做介紹，工(gong)作過(guo)(guo)(guo)程(cheng)：齒(chi)間(jian)(jian)基(ji)(ji)(ji)(ji)元(yuan)(yuan)容(rong)(rong)(rong)(rong)積(ji)（即每對(dui)齒(chi)所形成的(de)(de)工(gong)作容(rong)(rong)(rong)(rong)積(ji)）隨著轉(zhuan)子(zi)旋轉(zhuan)而逐步擴大，并(bing)和(he)機(ji)器左(zuo)下方的(de)(de)進(jin)氣(qi)(qi)(qi)(qi)孔(kong)口(kou)連(lian)(lian)通，氣(qi)(qi)(qi)(qi)體通過(guo)(guo)(guo)孔(kong)口(kou)進(jin)入基(ji)(ji)(ji)(ji)元(yuan)(yuan)容(rong)(rong)(rong)(rong)積(ji)，進(jin)氣(qi)(qi)(qi)(qi)過(guo)(guo)(guo)程(cheng)開(kai)(kai)始；轉(zhuan)子(zi)旋轉(zhuan)到一定角度后，齒(chi)間(jian)(jian)基(ji)(ji)(ji)(ji)元(yuan)(yuan)容(rong)(rong)(rong)(rong)積(ji)超過(guo)(guo)(guo)進(jin)氣(qi)(qi)(qi)(qi)孔(kong)口(kou)位(wei)置后，與進(jin)氣(qi)(qi)(qi)(qi)孔(kong)口(kou)斷開(kai)(kai)，進(jin)氣(qi)(qi)(qi)(qi)過(guo)(guo)(guo)程(cheng)結束(shu)；轉(zhuan)子(zi)轉(zhuan)到某一角度后，兩個孤(gu)立的(de)(de)齒(chi)間(jian)(jian)基(ji)(ji)(ji)(ji)元(yuan)(yuan)容(rong)(rong)(rong)(rong)積(ji)由于(yu)陽螺(luo)桿的(de)(de)凸齒(chi)侵(qin)入陰螺(luo)桿的(de)(de)凹齒(chi)，基(ji)(ji)(ji)(ji)元(yuan)(yuan)容(rong)(rong)(rong)(rong)積(ji)同(tong)時(shi)(shi)開(kai)(kai)始縮小，實現(xian)氣(qi)(qi)(qi)(qi)體的(de)(de)壓縮過(guo)(guo)(guo)程(cheng)。直到一對(dui)基(ji)(ji)(ji)(ji)元(yuan)(yuan)容(rong)(rong)(rong)(rong)積(ji)與排(pai)(pai)氣(qi)(qi)(qi)(qi)孔(kong)口(kou)相(xiang)連(lian)(lian)通的(de)(de)瞬間(jian)(jian)為(wei)止；基(ji)(ji)(ji)(ji)元(yuan)(yuan)容(rong)(rong)(rong)(rong)積(ji)和(he)排(pai)(pai)氣(qi)(qi)(qi)(qi)孔(kong)口(kou)相(xiang)連(lian)(lian)通后，排(pai)(pai)氣(qi)(qi)(qi)(qi)過(guo)(guo)(guo)程(cheng)開(kai)(kai)始，排(pai)(pai)氣(qi)(qi)(qi)(qi)過(guo)(guo)(guo)程(cheng)一直持續到兩個齒(chi)完全(quan)嚙合，即兩個基(ji)(ji)(ji)(ji)元(yuan)(yuan)容(rong)(rong)(rong)(rong)積(ji)因(yin)兩個轉(zhuan)子(zi)完全(quan)嚙合而等于(yu)零時(shi)(shi)。