水力噴射器具有抽真空和冷凝二次蒸汽的雙重作用，係由噴嘴、吸氣室、圓錐形導向檔板、混合室、喉管、擴散管和進水泵等部件所組成的真空機組。
水力噴射器借助水泵的壓力將水壓入噴嘴，水泵采用3K-9水shui泵beng兩liang隻zhi串chuan聯lian，或huo用yong五wu級ji離li心xin式shi水shui泵beng。水shui泵beng的de流liu量liang須xu滿man足zu二er次ci蒸zheng汽qi冷leng卻que水shui的de需xu用yong量liang。其qi揚yang程cheng也ye須xu滿man足zu水shui力li噴pen射she器qi的de進jin水shui壓ya力li的de要yao求qiu。具ju有you一yi定ding壓ya力li的de水shui流liu經jing截jie麵mian積ji較jiao小xiao的de噴pen嘴zui時shi，在zai噴pen嘴zui出chu口kou處chu產chan生sheng15~30米/miaodegaosusheliu，jingyidingjulihou，pensheshuiliuzhunquedijuhezaitongyijiaodianshang，penzuichukouchuyouyudongnengdezengjia，zegaichudeweinengjiangdi，congerchanshengleyidingdefuya，ercizhengqibeibuduandixiru，shiqiyuyoudingbujinrudelengqueshuichengcuoliuerzhijiejiechu，jinxingqiangliederelianghezhiliangjiaohuan，shiercizhengqilengningchengyeti，bingshiqitijijijubianxiao，congerhuodeleyidingdezhenkongdu，shinongsuoguochengshunlidijinxing。tongshigaosusheliushuyoubabuningsuodeqitichouchu，yibingjinghouguan、擴散管、排出管而排出於係統之外。
安an裝zhuang水shui力li噴pen射she器qi時shi，其qi排pai出chu管guan下xia端duan無wu須xu浸jin沒mei於yu水shui箱xiang的de水shui層ceng中zhong，其qi下xia端duan伸shen入ru水shui中zhong形xing成cheng的de水shui封feng，非fei但dan不bu能neng克ke服fu冷leng卻que水shui的de倒dao灌guan現xian象xiang，相xiang反fan隻zhi會hui增zeng加jia冷leng卻que水shui的de倒dao灌guan量liang。水shui力li噴pen射she器qi具ju雙shuang重zhong作zuo用yong，無wu須xu配pei置zhi真zhen空kong泵beng和he抽chou水shui泵beng，結jie構gou簡jian單dan，操cao作zuo方fang便bian。無wu機ji械xie運yun轉zhuan部bu分fen，效xiao能neng高gao，能neng源yuan消xiao耗hao較jiao其qi他ta型xing式shi少shao，但dan耗hao水shui量liang較jiao多duo，且qie要yao求qiu冷leng卻que水shui具ju一yi定ding的de清qing潔jie度du，否fou則ze噴pen嘴zui易yi堵du塞sai。
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