Kana paine cavitation yemapombi ecentrifugal, inogona kukonzera kudengenyeka uye ruzha panguva yekushanda kwayo kwezuva nezuva, dzimwe nguva tingafanira kumira kushanda.Saka isu tinofanirwa kutsvaga kuti ndezvipi zvikonzero zvinotungamira kune cavitation yemapombi ecentrifugal, saka isu taigona kudzivirira mibvunzo iyi kuitika nehungwaru.
Iyo cavitation yemapombi ecentrifugal, kana kuti cavitation, inzira yekuyerera mabubble emvura obva aputika.Kana mhedziso yekumhanya yekuyerera kwemvura ichiwedzera, sezvo iyo static yekumanikidza yekuyerera kwemvura inoderera, kune imwe chidimbu pane imwe tembiricha yemvura, kunyangwe pasina kupisa kubva kunze kwekupinza, asi ivo vasvika pamhepo yekumanikidza, zvekuti particle vaporization. , uye bubble rakagadzirwa.Panzira yekuyerera.

Kana iyo static pressure yemvura ichawedzerwa zvakare, yakakwira kupfuura mhute yekumanikidza, bubble rinoputika nekukurumidza.Chikamu chikuru che condensation implosion impact.Kana bubble richiputika risati riri mukuyerera kwemvura, asi mumadziro ezvikamu zvegungano remutungamiri, cavitation inotungamira kune zvikamu zvakanyorova zvakakonzerwa nekukukurwa.

Kana pombi yecentrifugal ichishanda pamamiriro e cavitation, kunyangwe pasina mvura inoyerera, unogona kuona kuti panguva ino ruzha rwepombi yecentrifugal yakakura kwazvo, kudengenyeka kunowedzera, kushanda kuderera, uye musoro unodzikira zvakanyanya. .

Iyo midziyo NPSHa , inonziwo inoshanda NPSH.Midziyo inopihwa nemidziyo yekusveta, munzvimbo yekusveta yecentrifugal pombi, uremu hweyuniti yemvura ine simba rekuwedzera kupfuura vaporization pressure uye musoro.Kumhiri kwemakungwa kudaidza iyi mambure akanaka ekuyamwa musoro, Iyo pombi inopinza (yemusoro chinzvimbo zero) ine musoro uzere wemvura minus vaporization pressure uye net surplus value, inomiririrwa neNPSHa.Kukosha kwayo uye parameters ine hukama nemidziyo yemvura.Nekuti inhalation mudziyo wakaenzana ne square yekuyerera uye hydraulic kurasikirwa.Saka NPSH inodzikira nekuwedzera kwehuwandu.NPSH-Q inzira inodzikira.Iyo NPSH ine hukama nemamiriro ekuyerera kwemapombi, yaive balance pump inlet pressure drop yakatemwa necentrifugal pombi pachayo.Izvi zvinoreva kuti, kuitira kuti tidzivise cavitation yepombi, tinoda kuti kune simba rakawedzerwa rinogona kudarika vapor pressure head in pombi inlet.Kumhiri kwemakungwa kudaidza iyi kuti inodiwa net positive suction head.Chirevo chemuviri wepombi NPSH chinoratidza chiyero chekudonha kwepombi inlet pressure yemvura.Iyo inonzi mambure akanaka ekusveta musoro anodiwa, Iyo inoda iyo inhalation mudziyo inofanira kupihwa yakakura mambure akanaka ekusveta musoro, kuitira kubhadhara madonhwe ekumanikidza, kuve nechokwadi kuti pombi cavitation haina kuitika.

NPSH ye multistage centrifugal pombi haina hukama nemidziyo paramita.Chete chine chekuita nemafambiro paramita mune pombi inlet.Motion paramita pane imwe kumhanya uye kuyerera paramita inotarwa neiyo geometry.Kureva kuti, NPSH inotemerwa nepombi pachayo.Kune pombi yakapihwa, zvisinei neiyo mvura, Pane imwe spidhi uye inoyerera nemupombi inopinza, saka, nekuda kwekumhanya kwakafanana saka ivo vane yakafanana kudonha kudonha, yakafanana NPSHr.Saka NPSHr haina hukama nezvinhu zvemvura.NPSH idiki, iyo idiki kumanikidza,

Ti inoda midziyo inofanira kupa diki NPSHa, uyezve kuramba kuri nani kwepombi cavitation.