Ukususwa kwephampu: Ithiyori kanye nokubala
Ukubuka konke kwesenzakalo se-cavitation
Ingcindezi yokuhwamuka koketshezi ingcindezi yokuhwamuka koketshezi (ingcindezi yomhwamuko egcwele). Ingcindezi yokuhwamuka koketshezi ihlobene nezinga lokushisa. Uma izinga lokushisa liphakeme, ingcindezi yokuhwamuka iba nkulu. Ingcindezi yokuhwamuka kwamanzi ahlanzekile ekushiseni kwegumbi okungu-20℃ ingu-233.8Pa. Ngenkathi ingcindezi yokuhwamuka kwamanzi ku-100℃ ingu-101296Pa. Ngakho-ke, amanzi ahlanzekile ekushiseni kwegumbi (20℃) aqala ukuhwamuka lapho ingcindezi yehla iye ku-233.8Pa.
Uma ingcindezi yoketshezi yehliswa ibe yingcindezi yokuhwamuka ekushiseni okuthile, uketshezi luzokhiqiza amabhamuza, okubizwa ngokuthi i-cavitation. Kodwa-ke, umhwamuko osebhamuza empeleni awuwona umusi ngokuphelele, kodwa futhi uqukethe igesi (ikakhulukazi umoya) ngesimo sokuncibilika noma i-nucleus.
Uma amabhamuza akhiqizwa ngesikhathi sokufakwa kwe-cavitation egeleza aye kungcindezi ephezulu, ivolumu yawo iyancipha futhi iqhume ngisho. Lesi simo sokuthi amabhamuza ayanyamalala oketshezini ngenxa yokwenyuka kwengcindezi sibizwa ngokuthi ukuwa kwe-cavitation.
Umkhuba we-cavitation epompo
Uma ipompo isebenza, uma indawo yendawo yengxenye yayo egcwele amanzi (ngokuvamile endaweni ethile ngemuva kokungena kwe-impeller blade). Ngesizathu esithile, lapho ingcindezi ephelele yoketshezi olupompiwe yehla iye ekucindezelweni kokuhwamuka ekushiseni kwamanje, uketshezi luqala ukuhwamuka lapho, lukhiqize umusi futhi lwakhe amabhamuza. Lawa mabhamuza ageleza phambili noketshezi, futhi uma efika ekucindezelweni okuthile okuphezulu, uketshezi oluphezulu oluzungeze amabhamuza luphoqa amabhamuza ukuthi anciphe kakhulu futhi aqhume ngisho. Lapho ibhamuza liqhuma, izinhlayiya zoketshezi zizogcwalisa umgodi ngesivinini esikhulu futhi zishayisane ukuze zakhe isando samanzi. Lesi simo sizobangela umonakalo wokugqwala ezingxenyeni zamandla angaphezu kwamandla uma kwenzeka odongeni oluqinile.
Le nqubo inqubo yokukhipha i-cavitation yephampu.
Ithonya le-cavitation yephampu
Khiqiza umsindo nokudlidliza
Umonakalo wokugqwala kwezingxenye zamandla angaphezu kwamandla
Ukuwohloka kokusebenza
Isibalo esiyisisekelo se-cavitation yephampu
Isibonelelo se-NPSHr-Pump cavitation sibizwa nangokuthi isibonelelo se-cavitation esidingekayo, futhi sibizwa ngokuthi i-negative net positive head engaphandle.
I-NPSHa-Isibonelelo sokucavitation sedivayisi sibizwa nangokuthi isibonelelo sokucavitation esisebenzayo, esinikezwa yidivayisi yokumunca. Uma i-NPSHA inkulu, kulapho amathuba okuba iphampu icavitation anciphe khona. I-NPSHa iyancipha ngokwanda kwethrafikhi.
Ubudlelwano phakathi kwe-NPSHa kanye ne-NPSHr lapho ukugeleza kushintsha
Indlela yokubala yokufakwa kwe-cavitation yedivayisi
hg=Pc/ρg－hc－Pv/ρg－[NPSH]
[NPSH]-Imvume yokuvula i-cavitation evumelekile
[NPSH] = (1.1 ~ 1.5) NPSHr
Uma izinga lokugeleza likhulu, thatha inani elikhulu, futhi uma izinga lokugeleza lincane, thatha inani elincane.
Isikhathi sokuthunyelwe: Jan-22-2024