Kubviswa kwePombi: Dzidziso uye Kuverenga
Pfupiso yechiitiko che cavitation
Kumanikidzwa kwekuvapo kwemvura mumvura isimba rekuvapo kwemvura (kumanikidzwa kwemhepo yakaguta). Kumanikidzwa kwekuvapo kwemvura mumvura kunoenderana nekupisa. Kana tembiricha yakakwira, simba rekuvapo kwemvura mumvura rakawanda. Kumanikidzwa kwekuvapo kwemvura yakachena patembiricha yemumba ye20℃ i233.8Pa. Ukuwo kumanikidzwa kwekuvapo kwemvura mumvura pa100℃ iri 101296Pa. Nokudaro, mvura yakachena patembiricha yemumba (20℃) inotanga kuvapo kana kumanikidzwa kwaderera kusvika pa233.8Pa.
Kana kumanikidzwa kwemvura kwadzikiswa kusvika pakumanikidzwa kwekuvapo kwemvura patembiricha yakati, mvura yacho inoburitsa mabubbles, anonzi cavitation. Zvisinei, utsi huri mububble haisi utsi hwakazara, asi hunewo gasi (kunyanya mhepo) muchimiro chekunyungudika kana kuti nucleus.
Kana mabhuru anogadzirwa panguva yekubuda kwemvura mudumbu achiyerera achienda kudzvinyiriro yakakwira, huwandu hwawo hunoderera uye hunotoputika. Chiitiko ichi chekuti mabhuru anonyangarika mumvura nekuda kwekukwira kwedzvinyiriro chinonzi kudonha kwemvura mudumbu.
Chiitiko che cavitation mupombi
Kana pombi iri kushanda, kana nzvimbo yenzvimbo yayo inoyerera (kazhinji iri kumashure kwenzvimbo inopinzwa nebanga re impeller). Neimwe chikonzero, kana kumanikidzwa kwemvura inopombwa kwaderera kusvika pakumanikidzwa kwekuvapo kwemhepo pakupisa kwazvino, mvura inotanga kupwanyika ipapo, ichigadzira utsi uye ichigadzira mabubble. Mabubble aya anoyerera mberi nemvura, uye paanosvika pakumanikidzwa kwakanyanya, mvura inomanikidzwa yakakomberedza mabubbles inomanikidza mabubble kuti apwanye zvakanyanya uye kutoputika. Kana bubble raputika, zvidimbu zvemvura zvinozadza gomba nekumhanya kukuru uye zvinosangana kuti zvigadzire hammer yemvura. Chiitiko ichi chichaita kuti zvikamu zvemhepo yakawandisa zvikuvadzwe kana zvikaitika pamadziro akasimba zvikuvadzwe nengura.
Maitiro aya ndiwo maitiro ekubvisa pombi.
Kukanganiswa kwepombi cavitation
Gadzira ruzha uye kudedera
Kukuvadzwa kwengura kwezvinhu zvinodarika simba remagetsi
Kudzikira kwekushanda zvakanaka
Pombi ye cavitation basic equation
NPSHr-Pump cavitation allowance inonziwo necessary cavitation allowance, uye inonzi necessary net positive head abroad.
NPSHa-Chipo che cavitation chemudziyo chinonziwo effective cavitation allowance, iyo inopihwa nemudziyo wekusveta. Kana NPSHA yakakura, mukana wekuti pombi ichaita cavitation ushoma. NPSHa inoderera nekuwedzera kwetraffic.
Hukama huripo pakati peNPSHa neNPSHr kana kuyerera kwemvura kuchichinja
Nzira yekuverenga cavitation yemudziyo
hg=Pc/ρg－hc－Pv/ρg－[NPSH]
[NPSH]-Mvumo yekuvhuvhuta cavitation inobvumidzwa
[NPSH] = (1.1 ~ 1.5) NPSHr
Kana mwero wekuyerera kwemvura wakawanda, tora kukosha kukuru, uye kana mwero wekuyerera kwemvura wakaderera, tora kukosha kudiki.
Nguva yekutumira: Ndira-22-2024