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(gan)壓(ya)(ya)縮機(ji)(ji)分為(wei)單螺(luo)桿(gan)壓(ya)(ya)縮機(ji)(ji)和雙螺(luo)桿(gan)壓(ya)(ya)縮機(ji)(ji)，直到1934年(nian)瑞典(dian)皇家理(li)工(gong)學(xue)院(yuan)A.Lysholm才奠(dian)定了(le)螺(luo)桿(gan)式壓(ya)(ya)縮機(ji)(ji)SRM技(ji)術，并(bing)開始在(zai)工(gong)業(ye)上應用，取得(de)了(le)迅速的發展。

雙螺桿主機(ji)(ji)做介紹，工(gong)作過程：齒(chi)間(jian)基(ji)(ji)元(yuan)(yuan)(yuan)(yuan)容(rong)(rong)(rong)(rong)積(ji)(ji)(ji)(ji)（即每(mei)對齒(chi)所形成的(de)(de)工(gong)作容(rong)(rong)(rong)(rong)積(ji)(ji)(ji)(ji)）隨(sui)著(zhu)轉(zhuan)(zhuan)(zhuan)子旋(xuan)轉(zhuan)(zhuan)(zhuan)而(er)逐步擴(kuo)大(da)，并和機(ji)(ji)器(qi)左下方的(de)(de)進(jin)(jin)氣(qi)(qi)(qi)(qi)孔口連(lian)通，氣(qi)(qi)(qi)(qi)體(ti)(ti)通過孔口進(jin)(jin)入基(ji)(ji)元(yuan)(yuan)(yuan)(yuan)容(rong)(rong)(rong)(rong)積(ji)(ji)(ji)(ji)，進(jin)(jin)氣(qi)(qi)(qi)(qi)過程開始；轉(zhuan)(zhuan)(zhuan)子旋(xuan)轉(zhuan)(zhuan)(zhuan)到(dao)(dao)一(yi)定角度(du)后，齒(chi)間(jian)基(ji)(ji)元(yuan)(yuan)(yuan)(yuan)容(rong)(rong)(rong)(rong)積(ji)(ji)(ji)(ji)超過進(jin)(jin)氣(qi)(qi)(qi)(qi)孔口位(wei)置后，與進(jin)(jin)氣(qi)(qi)(qi)(qi)孔口斷開，進(jin)(jin)氣(qi)(qi)(qi)(qi)過程結(jie)束；轉(zhuan)(zhuan)(zhuan)子轉(zhuan)(zhuan)(zhuan)到(dao)(dao)某一(yi)角度(du)后，兩個(ge)孤立的(de)(de)齒(chi)間(jian)基(ji)(ji)元(yuan)(yuan)(yuan)(yuan)容(rong)(rong)(rong)(rong)積(ji)(ji)(ji)(ji)由于(yu)陽(yang)螺桿的(de)(de)凸齒(chi)侵(qin)入陰螺桿的(de)(de)凹齒(chi)，基(ji)(ji)元(yuan)(yuan)(yuan)(yuan)容(rong)(rong)(rong)(rong)積(ji)(ji)(ji)(ji)同時開始縮小，實現氣(qi)(qi)(qi)(qi)體(ti)(ti)的(de)(de)壓(ya)縮過程。直到(dao)(dao)一(yi)對基(ji)(ji)元(yuan)(yuan)(yuan)(yuan)容(rong)(rong)(rong)(rong)積(ji)(ji)(ji)(ji)與排(pai)(pai)氣(qi)(qi)(qi)(qi)孔口相連(lian)通的(de)(de)瞬間(jian)為止；基(ji)(ji)元(yuan)(yuan)(yuan)(yuan)容(rong)(rong)(rong)(rong)積(ji)(ji)(ji)(ji)和排(pai)(pai)氣(qi)(qi)(qi)(qi)孔口相連(lian)通后，排(pai)(pai)氣(qi)(qi)(qi)(qi)過程開始，排(pai)(pai)氣(qi)(qi)(qi)(qi)過程一(yi)直持續到(dao)(dao)兩個(ge)齒(chi)完全嚙合，即兩個(ge)基(ji)(ji)元(yuan)(yuan)(yuan)(yuan)容(rong)(rong)(rong)(rong)積(ji)(ji)(ji)(ji)因兩個(ge)轉(zhuan)(zhuan)(zhuan)子完全嚙合而(er)等于(yu)零時。