(1) Impeller yog qhov tseem ceeb ntawm lub twj tso kua mis submerged. Nws tuaj yeem muab faib ua peb hom: kaw, ib nrab kaw thiab qhib. Lub impeller kaw yog tsim rau conveying kua huv; lub semi-kaw thiab qhib impellers yog tsim rau conveying ncua kev kawm ntawv uas muaj cov khoom hais, uas yog inefficient.
Raws li kev sib txawv ntawm cov kua nqus dej, lub impeller tuaj yeem muab faib ua ib qho suction thiab ob chav suction. Ib qho suction impeller muaj cov qauv yooj yim, thiab cov kua tsuas tuaj yeem nqus tau los ntawm ib sab. Ob chav suction impeller tuaj yeem nqus cov kua symmetrically los ntawm ob sab ntawm lub impeller tib lub sijhawm. Nws tsis tsuas yog muaj peev xwm nqus dej loj, tab sis kuj tseem tshem tawm cov axial thrust.
Raws li cov geometry ntawm cov hniav ntawm lub impeller, cov hniav tuaj yeem muab faib ua rov qab khoov, radial dabtsi yog khoov thiab pem hauv ntej khoov. Rov qab nkhaus hniav yog siv dav vim tias lawv muaj qhov tsim nyog rau kev hloov pauv ntawm cov kua kinetic zog rau hauv lub zog zoo li qub; radial hniav yog siv nyob rau hauv ib feem ntawm cov twj tso kua mis thiab cov twj uas tsis-clogging; rau pem hauv ntej nkhaus hniav yog tsis tshua muaj siv nyob rau hauv submerged twj.
(2) Txhawm rau txo lub zog poob los ntawm kev cuam tshuam thaum cov kua tawm ntawm lub impeller ncaj qha nkag mus rau lub plhaub twj tso kua mis, lub log tsheb ruaj khov nrog cov hniav yog qee zaum ntsia nruab nrab ntawm lub impeller thiab lub plhaub twj tso kua mis. Cov hniav nyob rau hauv phau ntawv qhia log maj mam tig cov kua nkag mus rau hauv lub twj tso kua mis plhaub, thiab cov ndlwg channel txuas ntxiv mus, yog li ntawd ib feem ntawm lub zog kinetic tau zoo hloov dua siab tshiab rau hauv lub zog zoo li qub. Kev taw qhia log feem ntau yog ntsia rau hauv ntau theem submerged twj. Snail-shaped pump casing, rov qab nkhaus hniav ntawm impeller thiab phau ntawv qhia log tuaj yeem txhim kho qhov hloov pauv ntawm lub zog kinetic rau lub zog zoo li qub, yog li lawv tuaj yeem suav tias yog lub zog hloov pauv.
(3) Rau cov khoom siv sib khi, lub plhaub twj tso kua mis yog tsau vim yog kev sib hloov ntawm lub twj tso kua mis, thiab yuav tsum muaj qee qhov sib txawv ntawm qhov sib cuag ntawm cov ncej thiab lub plhaub twj tso kua mis. Txhawm rau kom tsis txhob muaj cov kua dej tawm hauv lub twj tso kua mis raws qhov sib txawv los yog tiv thaiv cov cua sab nraud los ntawm kev nkag mus rau lub twj tso kua mis los ntawm qhov sib txawv, cov khoom siv foob yuav tsum tau teeb tsa. Lub twj tso kua mis ntawm lub twj tso kua mis muaj xws li lub thawv ntim khoom thiab lub tshuab (lub ntsej muag kawg) foob. Lub thawv ntim khoom yog ua kom lub twj tso kua mis rau hauv lub nplhaib sib khi los ntawm qhov sib txawv ntawm lub twj tso kua mis, thiab nruab cov khoom muag (xws li hlua asbestos soaked hauv roj lossis coated nrog graphite, thiab lwm yam). Lub tshuab foob yog tsim los ntawm lub nplhaib txav tau nruab rau ntawm lub tshuab tig thiab lwm lub nplhaib zoo li qub tau kho ntawm lub plhaub twj tso kua mis. Lub ntsej muag kawg ntawm ob lub nplhaib yog nyob ze rau ib leeg thiab tig cov txheeb ze rau ib leeg los ntawm lub caij nplooj ntoos hlav quab yuam, uas plays lub luag haujlwm sib khi. Mechanical seals yog tsim rau lub sijhawm uas yuav tsum muaj kev sib khi siab, xws li xa cov kua qaub, alkali, flammable, explosive thiab lom kua.