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)壓縮(suo)機分為(wei)單螺(luo)桿(gan)壓縮(suo)機和雙螺(luo)桿(gan)壓縮(suo)機，直到(dao)1934年(nian)瑞典皇(huang)家(jia)理工學(xue)院A.Lysholm才奠定(ding)了螺(luo)桿(gan)式壓縮(suo)機SRM技(ji)術，并開始在工業(ye)上應用(yong)，取得了迅速的發(fa)展。

雙螺(luo)桿(gan)(gan)(gan)主機(ji)做介紹，工作(zuo)過(guo)(guo)程(cheng)(cheng)：齒(chi)間基(ji)(ji)元容(rong)(rong)(rong)(rong)積（即每對齒(chi)所形成的(de)工作(zuo)容(rong)(rong)(rong)(rong)積）隨著(zhu)轉(zhuan)(zhuan)子旋(xuan)轉(zhuan)(zhuan)而逐步擴(kuo)大，并和機(ji)器左下方的(de)進氣(qi)孔(kong)口(kou)連通(tong)，氣(qi)體(ti)(ti)通(tong)過(guo)(guo)孔(kong)口(kou)進入基(ji)(ji)元容(rong)(rong)(rong)(rong)積，進氣(qi)過(guo)(guo)程(cheng)(cheng)開始(shi)；轉(zhuan)(zhuan)子旋(xuan)轉(zhuan)(zhuan)到(dao)一(yi)(yi)定(ding)角(jiao)度后，齒(chi)間基(ji)(ji)元容(rong)(rong)(rong)(rong)積超過(guo)(guo)進氣(qi)孔(kong)口(kou)位(wei)置后，與(yu)進氣(qi)孔(kong)口(kou)斷(duan)開，進氣(qi)過(guo)(guo)程(cheng)(cheng)結束；轉(zhuan)(zhuan)子轉(zhuan)(zhuan)到(dao)某一(yi)(yi)角(jiao)度后，兩個(ge)(ge)孤(gu)立的(de)齒(chi)間基(ji)(ji)元容(rong)(rong)(rong)(rong)積由于陽螺(luo)桿(gan)(gan)(gan)的(de)凸齒(chi)侵入陰螺(luo)桿(gan)(gan)(gan)的(de)凹齒(chi)，基(ji)(ji)元容(rong)(rong)(rong)(rong)積同(tong)時開始(shi)縮(suo)小(xiao)，實現(xian)氣(qi)體(ti)(ti)的(de)壓縮(suo)過(guo)(guo)程(cheng)(cheng)。直到(dao)一(yi)(yi)對基(ji)(ji)元容(rong)(rong)(rong)(rong)積與(yu)排(pai)氣(qi)孔(kong)口(kou)相連通(tong)的(de)瞬間為止；基(ji)(ji)元容(rong)(rong)(rong)(rong)積和排(pai)氣(qi)孔(kong)口(kou)相連通(tong)后，排(pai)氣(qi)過(guo)(guo)程(cheng)(cheng)開始(shi)，排(pai)氣(qi)過(guo)(guo)程(cheng)(cheng)一(yi)(yi)直持續到(dao)兩個(ge)(ge)齒(chi)完(wan)全(quan)嚙合(he)，即兩個(ge)(ge)基(ji)(ji)元容(rong)(rong)(rong)(rong)積因兩個(ge)(ge)轉(zhuan)(zhuan)子完(wan)全(quan)嚙合(he)而等于零時。