比功率是(shi)指壓(ya)(ya)縮(suo)機(ji)(ji)(ji)(ji)單位容(rong)積流量所(suo)消耗的功率。是(shi)評價壓(ya)(ya)縮(suo)機(ji)(ji)(ji)(ji)能(neng)(neng)效的重(zhong)要指標(biao)。空(kong)(kong)壓(ya)(ya)機(ji)(ji)(ji)(ji)比功率單位：KW/m3。按照標(biao)準GB19153-2009《容(rong)積式(shi)空(kong)(kong)氣(qi)壓(ya)(ya)縮(suo)機(ji)(ji)(ji)(ji)能(neng)(neng)效限(xian)定值及能(neng)(neng)效等(deng)級》規定，空(kong)(kong)壓(ya)(ya)機(ji)(ji)(ji)(ji)能(neng)(neng)效等(deng)級分為4級：1級(級)、2級(節能(neng)(neng)評價值)、T級(目標(biao)能(neng)(neng)效限(xian)定值)、3級(能(neng)(neng)效限(xian)定值)。螺桿(gan)空(kong)(kong)壓(ya)(ya)機(ji)(ji)(ji)(ji)屬(shu)于(yu)機(ji)(ji)(ji)(ji)械(xie)類(lei)產品，螺桿(gan)空(kong)(kong)壓(ya)(ya)機(ji)(ji)(ji)(ji)，在使(shi)用(yong)過程(cheng)中也需要維護保養(yang)。每日(ri)檢(jian)查油(you)(you)位、排氣(qi)溫度和(he)排氣(qi)壓(ya)(ya)力，檢(jian)查有無異(yi)常聲(sheng)音(yin)；每周開機(ji)(ji)(ji)(ji)前打(da)開分離器排污閥(fa)排放冷凝水，檢(jian)查各(ge)處有無泄漏，檢(jian)查安全閥(fa)，檢(jian)查皮帶磨損(sun)情況(目測(ce))。建議每1500-2000小(xiao)時更(geng)換(huan)新濾(lv)芯，變(bian)頻螺桿(gan)空(kong)(kong)壓(ya)(ya)機(ji)(ji)(ji)(ji)，換(huan)機(ji)(ji)(ji)(ji)油(you)(you)時同時更(geng)換(huan)油(you)(you)濾(lv)芯，在環境惡劣時使(shi)用(yong)應縮(suo)短更(geng)換(huan)周期(qi)。嚴(yan)禁超(chao)期(qi)限(xian)使(shi)用(yong)機(ji)(ji)(ji)(ji)油(you)(you)濾(lv)芯，螺桿(gan)式(shi)空(kong)(kong)壓(ya)(ya)機(ji)(ji)(ji)(ji)廠家，否則由于(yu)濾(lv)芯堵塞嚴(yan)重(zhong)，壓(ya)(ya)差超(chao)過旁(pang)通(tong)閥(fa)承(cheng)受(shou)界限(xian)，旁(pang)通(tong)閥(fa)自(zi)動打(da)開，大量贓物、顆粒會(hui)直(zhi)接隨機(ji)(ji)(ji)(ji)油(you)(you)進(jin)入螺桿(gan)主機(ji)(ji)(ji)(ji)內，造成嚴(yan)重(zhong)后(hou)果(guo)。

大(da)多數螺(luo)桿(gan)(gan)空(kong)(kong)(kong)(kong)壓機使用案(an)例，管(guan)網耗氣量不斷變化(hua)，空(kong)(kong)(kong)(kong)壓機產(chan)氣量不可能恒(heng)等于(yu)管(guan)網耗氣量，當(dang)管(guan)網壓力等于(yu)設(she)定(ding)(ding)(ding)值時(shi)，雙(shuang)螺(luo)桿(gan)(gan)式空(kong)(kong)(kong)(kong)壓機，螺(luo)桿(gan)(gan)空(kong)(kong)(kong)(kong)壓機進(jin)入空(kong)(kong)(kong)(kong)載狀(zhuang)態(tai)(tai)。當(dang)螺(luo)桿(gan)(gan)空(kong)(kong)(kong)(kong)壓機的(de)產(chan)氣量持(chi)續等于(yu)管(guan)網耗氣量時(shi)，螺(luo)桿(gan)(gan)空(kong)(kong)(kong)(kong)壓機處于(yu)節能狀(zhuang)態(tai)(tai)。變頻(pin)器自身消耗3%的(de)功率，電(dian)動機偏(pian)離(li)額定(ding)(ding)(ding)功率和額定(ding)(ding)(ding)轉(zhuan)速時(shi)效(xiao)率有明(ming)顯下(xia)降，螺(luo)桿(gan)(gan)空(kong)(kong)(kong)(kong)壓機轉(zhuan)速偏(pian)離(li)額定(ding)(ding)(ding)轉(zhuan)速時(shi)佳油氣混(hun)合比例被破(po)壞，效(xiao)率也有明(ming)顯下(xia)降。陰陽轉(zhuan)子(zi)之(zhi)間和轉(zhuan)子(zi)與氣缸及(ji)缸蓋之(zhi)間的(de)間隙對螺(luo)桿(gan)(gan)空(kong)(kong)(kong)(kong)壓機能耗有重大(da)影響。提高轉(zhuan)子(zi)加(jia)工精度和表面光潔度是減(jian)小機頭(tou)各元件之(zhi)間間隙的(de)有效(xiao)手(shou)段。

螺(luo)(luo)桿(gan)空(kong)壓機(ji)(ji)的(de)轉子型(xing)線對節(jie)能(neng)有一定影響，2000年之前(qian)(qian)螺(luo)(luo)桿(gan)空(kong)壓機(ji)(ji)尚在成長期，可(ke)靠性(xing)是主要(yao)問題。那(nei)時(shi)，螺(luo)(luo)桿(gan)空(kong)壓機(ji)(ji)的(de)轉子型(xing)線研發把可(ke)靠性(xing)作為(wei)主要(yao)目標。新機(ji)(ji)次運行500小時(shi)后應更換(huan)機(ji)(ji)油(you)芯，用扳手反旋油(you)濾芯取下(xia)，新濾芯裝(zhuang)上前(qian)(qian)記得(de)加上加螺(luo)(luo)桿(gan)機(ji)(ji)油(you)，濾芯密封用雙手擰(ning)回油(you)濾座，用力擰(ning)緊。其(qi)中(zhong)1級(ji)能(neng)效(xiao)高，低于3級(ji)禁止生產和銷售。T級(ji)為(wei)目標能(neng)效(xiao)限定等(deng)級(ji)，其(qi)能(neng)效(xiao)優(you)于3級(ji)，已于2013年12月1日起替代3級(ji)能(neng)效(xiao)值。