Isivinini sokubuyela emuva sisho isivinini (esibizwa nangokuthi isivinini sokubuya, isivinini sokuhlehla) se-aiphampu ye-turbine ejulile kahlelapho uketshezi lugeleza empompini lubheke emuva ngaphansi kwekhanda elithile (okungukuthi, umehluko ophelele wekhanda phakathi kwepayipi lokuphuma kwepompo kanye nepayipi lokumunca).

Lesi simo singenzeka kumasistimu anejika lesici lesistimu elinekhanda elimile eliphakeme (Hsys, 0), kodwa futhi nasemaphampini eturbine amile kahle asebenza ngokuhambisana. 

Lapho iyunithi yephampu ivaleka kungazelelwe, ivalvu yokuhlola i-outlet ihluleka, futhi ipayipi lokuphuma livuliwe, isiqondiso soketshezi ngepompo sizohlehliswa, futhi i-rotor yepompo izojikeleza ngesivinini sokusebenza esibuyela emuva ngemva kokushintsha isiqondiso sokugeleza.

Isivinini sokusebenza esibuyela emuva ngokuvamile siphezulu kakhulu kunesivinini esivamile sokusebenza futhi sincike ezimeni zesistimu (ikakhulukazi ingcindezi yamanje) kanye nesivinini esithile sepompo (ns). Isivinini esikhulu sokusebenza esihlanekezelwe sephampu yokugeleza kwe-radial (ns ≈ 40 r/min) cishe siphezulu ngo-25% kunesivinini esivamile sokusebenza sepompo, kuyilapho isivinini esikhulu sokusebenza esibuyela emuva sephampu ye-axial flow (ns ≥ 100 r/min ) iphakeme kunesivinini esivamile sokusebenza sephampu. Isebenza ngokushesha ngo-100%.

Lezi zimo zokusebenza zingase zenzeke futhi uma isici sokuvala esisetshenziselwa ukuvikela ukucindezela komfutho (isando samanzi) kungeyona i-valve yokuhlola kodwa isici sokuvala esivala kancane. Uketshezi oluningi olubuyisiwe lungageleza luphume ngephampu ye-turbine ejulile emile.

Uma ukucindezela kokuqhuma kubangelwa ukwehluleka kwamandla kuyunithi yokushayela futhi akukho valve yokuhlola efakiwe, i-pump shaft izophinde ijikeleze ngokuphambene. Phakathi nale nqubo, kufanele kuqashelwe kakhulu izingozi ezihilelekile ngama-bearings angenalutho kanye nezigxivizo zemishini ezisebenza kuphela ohlangothini olulodwa lokuzungezisa, kanye nokuxegiswa okungenzeka kwezibophelelo ezinentambo ku-shafts ejikelezayo.

Uma i-medium ebuyayo isesimweni esiseduze nendawo yokubila, okuphakathi kungase kuhwamuke lapho iphampu noma i-pressure side throttling device icindezela.

Isivinini sokuhlehla sokusebenza sokugeleza okuqukethe umhwamuko (ukubuyisela) ngokuqhathaniswa nokugeleza koketshezi olubuyayo, njengomsebenzi wempande eyisikwele yesilinganiso soketshezi/umhwamuko, singakhuphukela kumanani aphezulu ayingozi.

Uma idrayivu yemoto ivulwa empompini yeturbine ejulile eqondile ejikela kwelinye icala eliya endaweni evamile yokuzungezisa, isikhathi sokuqalisa sesethi yephampu sizoba side kakhulu. Kulesi simo sokusebenza, kuma-asynchronous motors, ukunyuka kwezinga lokushisa okungeziwe kwe-motor kumele kuqashelwe.

Izinyathelo ezifanele kuphela ezingathathwa ukuze kuvinjelwe ukulimala kwesethi yepompo okubangelwa isivinini sokugijima esihlanekezela ngokweqile.

Izinyathelo eziphikisanayo zokuvimbela isivinini sokubuyela emuva ukuthi sibe phezulu kakhulu zifaka:

1) Faka umshini wokulwa ne-reverse (njengedivaysi yokukhiya i-backflow) ku-shaft yepompo;

2) Faka i-valve yokuhlola indlela eyodwa ethembekile yokuzivala ngokwayo (njenge-valve yokuhlola i-swing) epayipini lokuphuma kwepompo.

Qaphela: Idivayisi evimbela ukuhlehla isetshenziselwa ukuvimbela iphampu ukuthi ingahlehli. Phakathi kwabo, idivayisi yokuvimbela i-backflow isebenza ngokuvumelana nesimiso sokujikeleza phambili ngaphandle kwesithiyo. Uma isiqondiso sokujikeleza se-shaft sihlehlisiwe, ukujikeleza kwe-rotor kuzomiswa ngokushesha.