Isantya sokubuya umva sibhekisa kwisantya (esikwabizwa ngokuba yisantya sokubuya, umva isantya) seimpompo yeinjini yomoya enzulu kakuhlexa ulwelo luhamba ngempompo kwicala elingasemva phantsi kwentloko ethile (oko kukuthi, umahluko wentloko uwonke phakathi kombhobho ophumayo wempompo kunye nombhobho wokufunxa).

Le meko inokuthi yenzeke kwiinkqubo ezinegophe lophawu lwenkqubo enentloko engashukumiyo ephezulu (Hsys, 0), kodwa nakwiimpompo zeinjini yeinjini ezithe nkqo ezisebenza ngokuhambelanayo. 

Xa iyunithi yempompo ivala ngokungalindelekanga, i-valve yokukhangela i-outlet ayiphumelelanga, kwaye umbhobho wokuphuma uvulekile, isalathiso se-fluid ngepompo siya kuguqulwa, kwaye i-rotor yepompo iya kujikeleza kwisantya sokusebenza emva kokutshintsha kwesikhokelo sokuhamba.

Isantya sokusebenza esibuyela umva sihlala siphezulu kakhulu kunesantya esiqhelekileyo sokusebenza kwaye sixhomekeke kwiimeko zenkqubo (ingakumbi uxinzelelo lwangoku) kunye nesantya esithile sempompo (ns). Isantya esiphezulu sokusebenza esibuyela umva sempompo ye-radial flow (ns ≈ 40 r/min) imalunga ne-25% ephezulu kunesantya esiqhelekileyo sokusebenza sempompo, ngelixa isantya esiphezulu sokusebenza esibuyela umva sempompo yokuhamba kwe-axial (ns ≥ 100 r/min). ) iphezulu kunesantya esiqhelekileyo sokusebenza sempompo. Ibaleka 100% ngokukhawuleza.

Ezi meko zokusebenza zinokuthi zenzeke ukuba into yokuvala esetyenziselwa ukukhusela uxinzelelo lokunyuka (ihamile yamanzi) ayisiyivalvu yokujonga kodwa yinto yokuvala ngokucothayo. Uninzi lolwelo olubuyisiweyo lunokuphumela ngaphandle kwimpompo yeinjini yeinjini enzulu.

Ukuba ukunyanzeliswa koxinzelelo kubangelwa ukusilela kwamandla kwiyunithi yokuqhuba kwaye akukho valve yokutshekisha efakwe, i-shaft yepompo nayo iya kujikeleza kwelinye icala. Ngethuba le nkqubo, ingqwalasela esondeleyo kufuneka ihlawulwe kwakhona kwiingozi ezibandakanyekayo kunye neebheringi ezicacileyo kunye nezitywina zoomatshini ezisebenza kuphela kwicala elinye lokujikeleza, kunye nokukhulula okunokwenzeka kwee-fasteners ezifakwe kwii-shafts ezijikelezayo.

Ukuba isiphakathi esibuyayo sikwimeko ekufutshane nendawo yokubila, isiphakathi sinokuthi sibe ngumphunga xa impompo okanye icala loxinzelelo lwesixhobo esicinezelayo sidakumba.

Isantya sokubuyela umva sokuhamba komphunga (ukubuyisela) ngokuchasene nembuyekezo yolwelo, njengomsebenzi wesikweri sengcambu yomlinganiselo wolwelo/umphunga woxinaniso, unokunyuka ukuya kumaxabiso aphezulu ngokuyingozi.

Ukuba i-motor ye-drive ilayitiwe kwimpompo ye-injini ye-injini ethe nkqo ejikeleza kwelinye icala ukuya kwicala eliqhelekileyo lokujikeleza, ixesha lokuqalisa leseti yempompo liya kuba lide kakhulu. Kule meko yokusebenza, kwii-asynchronous motors, ukunyuka kweqondo lokushisa elongezelelweyo lemoto kufuneka kuqatshelwe.

Kuphela amanyathelo afanelekileyo anokuthi athathwe ukukhusela umonakalo kwimpompo esetyenzisiweyo ebangelwa ukugqithiswa kwesantya sokuhamba.

Amanyathelo okuthintela ukuthintela isantya sokubuyela umva ekubeni siphezulu kakhulu ziquka:

1) Faka i-mechanical anti-reverse device (efana nesixhobo sokuvala i-backflow) kwi-shaft yepompo;

I-2) Faka i-valve ethembekileyo yokuzivala enye indlela yokukhangela (njenge-valve yokukhangela i-swing) kumbhobho wokuphuma kwempompo.

Qaphela: Isixhobo esichasene ne-reverse sisetyenziselwa ukuthintela impompo ukuba ingabuyi umva. Phakathi kwabo, isixhobo sokuthintela umva sisebenza ngokomgaqo wokujikeleza phambili ngaphandle kwesithintelo. Emva kokuba ulwalathiso olujikelezayo lwe-shaft luguqulwa, ukujikeleza kwe-rotor kuya kumiswa ngokukhawuleza.