I-Cavitation of Pump: Ithiyori nokubala
Ukubuka konke kwe-cavitation phenomenon
Ingcindezi ye-liquid vaporization ingcindezi yokuhwamuka koketshezi (ingcindezi yomhwamuko egcwele). Umfutho we-vaporization we-liquid uhlobene nezinga lokushisa. Uma izinga lokushisa liphakeme, ingcindezi yokuhwamuka iyanda. Umfutho we-vaporization wamanzi ahlanzekile ekamelweni lokushisa lika-20 ℃ ngu-233.8Pa. Ngenkathi ingcindezi yokuhwamuka kwamanzi ku-100 ℃ ingu-101296Pa. Ngakho-ke, amanzi ahlanzekile ekamelweni lokushisa (20 ℃) aqala ukuhwamuka lapho ingcindezi yehla ibe ngu-233.8Pa.
Lapho umfutho we-liquid wehliselwa ekucindezelweni kwe-vaporization ekushiseni okuthile, uketshezi luzokhiqiza ama-bubbles, okubizwa ngokuthi i-cavitation. Nokho, umhwamuko kubhamuza empeleni awuwona umusi ngokuphelele, kodwa futhi uqukethe igesi (ikakhulukazi umoya) ngendlela yokuhlakazeka noma i-nucleus.
Lapho ama-bubbles akhiqizwa ngesikhathi sokugeleza kwe-cavitation kungcindezi ephezulu, ivolumu yawo iyancipha futhi iqhume. Lesi simo sokuthi amabhamuza anyamalale oketshezini ngenxa yokukhuphuka kwengcindezi ibizwa ngokuthi yi-cavitation collapse.
I-phenomenon ye-cavitation kupompo
Lapho ipompo isebenza, uma indawo yendawo yengxenye yayo echichimayo (imvamisa endaweni ethile ngemuva kokungena kwe-impeller blade). Ngesizathu esithile, lapho ukucindezela okuphelele koketshezi olupompowe kwehla kumfutho we-vaporization ezingeni lokushisa lamanje, uketshezi luqala ukuhwamuka lapho, lukhiqize umusi futhi lwenza amabhamuza. Lawa mabhamuza agelezela phambili noketshezi, futhi lapho efinyelela umfutho othile ophezulu, uketshezi olunomfutho ophezulu ozungeze amabhamuza luphoqa amabhamuza ukuthi ashwabane kakhulu futhi aze aqhume. Lapho ibhamuza liqhuma, izinhlayiya eziwuketshezi zizogcwalisa umgodi ngesivinini esikhulu futhi zingqubuzane zenze isando samanzi. Lesi simo sizodala umonakalo wokugqwala ezingxenyeni ezidlulele uma senzeka odongeni oluqinile.
Le nqubo inqubo ye-cavitation yepompo.
Umthelela we-cavitation yepompo
Khiqiza umsindo nokudlidliza
Ukulimala kokugqwala kwezingxenye ezidlulele manje
Ukwehliswa kokusebenza
I-Pump cavitation equation eyisisekelo
I-NPSHr-Pump cavitation allowance ibizwa nangokuthi i-cavitation allowance edingekayo, futhi ibizwa nge-net positive head phesheya.
I-NPSHa-I-cavitation allowance yedivayisi ibizwa nangokuthi i-cavitation allowance esebenzayo, ehlinzekwa idivayisi yokudonsa. Uma i-NPSHA inkulu, mancane amathuba okuthi iphampu izoba yi-cavitation. I-NPSha iyancipha ngokunyuka kwethrafikhi.
Ubudlelwano phakathi kwe-NPSHa ne-NPSHr lapho ukugeleza kushintsha
Indlela yokubala ye-cavitation yedivayisi
hg=Pc/ρg－hc－Pv/ρg－[NPSH]
[NPSH]-Imvume ye-cavitation evumelekile
[NPSH] = (1.1 ~ 1.5) NPSHr
Uma izinga lokugeleza likhulu, thatha inani elikhulu, futhi lapho izinga lokugeleza lilincane, thatha inani elincane.
Isikhathi sokuthumela: Jan-22-2024