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Phallo ea coefficient le cavitation coefficient ea valve e hlalositsoe ka ho qaqileng tafoleng ea papiso ea khatello le mocheso oa thepa ea valve.
2022-07-11
Phallo ea phallo le cavitation coefficient ea valve e hlalositsoe ka ho qaqileng tafoleng ea papiso ea khatello le mocheso oa thepa ea valve Parameter ea bohlokoa ea valve ke phallo ea phallo le coefficient ea cavitation ea valve, e fumanehang ka kakaretso ho data ea li-valve tse hlahisoang. linaheng tse tsoetseng pele tsa indasteri, esita le ho hatisoa ka mohlala. Naha ea rona e hlahisa li-valve ha e le hantle ha e na tlhahisoleseling ea karolo ena, hobane fumana karolo ena ea data e hlokahalang ho etsa liteko ho khona ho tsoela pele, ena ke naha ea rona le boemo bo tsoetseng pele ba lefats'e la lekhalo la valve e 'ngoe ea ts'ebetso ea bohlokoa. . A, phallo ea phallo ea li-valve Motsoako oa phallo ea li-valve ke tekanyo ea tekanyo ea phallo ea phallo ea valve, ho feta tekanyo ea phallo ea phallo, mokelikeli o phallang ka valve ha tahlehelo ea khatello e le nyenyane. Ho ea ka KV value calculation formula Moo: KV -- flow coefficient Q -- volume flow m3/h δ P -- valve khatello ea tahlehelo barP -- fluid density kg/m3 Tse peli, valve cavitation coefficient The cavitation coefficient δ value e sebelisoa ho fumana ke mofuta ofe oa mohaho oa li-valve oo u ka o khethang bakeng sa ho laola phallo. Moo: H1 -- khatello ea mH2 -- phapang pakeng tsa khatello ea sepakapaka le khatello ea mouoane e tletseng mocheso o lumellanang le mocheso M δ P - phapang pakeng tsa khatello pele le ka morao valve M The cavitation coefficient e amohelehang δ e fapana har'a li-valve ka lebaka la litlhophiso tsa tsona tse fapaneng. Joalokaha ho bontšitsoe setšoantšong. Haeba palo e lekantsoeng ea cavitation e kholo ho feta e amohelehang ea cavitation coefficient, polelo e nepahetse 'me cavitation e ke ke ea etsahala. Haeba coefficient ea cavitation e amohelehang e le 2.5, joale: Haeba δ2.5, cavitation e ke ke ea etsahala. Ho 2.5δ1.5, cavitation e nyane e etsahala. Ho delta 1.5, ho thothomela hoa etsahala. Tšebeliso e tsoelang pele ea δ0.5 e tla senya valve le liphaephe tse tlase. Mekhoa ea motheo le e sebetsang ea li-valve ha e bontše ha cavitation e etsahala, ho sa tsotellehe hore na moeli oa ts'ebetso o fihlile neng. Ka ho bala ka holimo ho hlakile. Ka hona, cavitation e etsahala hobane ha pompo ea rotor e feta karolong ea karolo e fokotsehang nakong ea phallo e potlakileng ea metsi, karolo ea mokelikeli e fetoha mouoane, 'me li-bubble tse hlahisoang ebe li phatloha karolong e bulehileng ka mor'a valve, e nang le lipontšo tse tharo: (1) Lerata (2) ho thothomela (tšenyo e tebileng ea motheo le mehaho e amanang le eona, e bakang ho robeha ha mokhathala) (3) Tšenyo ea thepa (ho senyeha ha 'mele oa valve le pipe) Ho tloha palong e ka holimo, ha ho thata ho bona cavitation eo. e amana haholo le khatello ea H1 ka mor'a valve. Ho eketsa H1 ho hlakile hore ho tla fetola boemo le ho ntlafatsa mokhoa: A. Kenya valve e tlaase moleng. B. Kenya poleiti ea orifice phala ka mor'a valve ho eketsa ho hanyetsa. C. The valve outlet e bulehile 'me ka ho toba e bokella letamo, e leng ho eketsang sebaka sa ho phatloha ha bubble le ho fokotsa khoholeho ea cavitation. Tlhahlobo e felletseng ea lintlha tse 'ne tse kaholimo, e akaretse belofo ea heke, lintlha tsa mantlha tsa valve ea serurubele le lethathamo la litlhophiso bakeng sa khetho e bonolo. Likarolo tse peli tsa bohlokoa li bapala karolo ea bohlokoa ts'ebetsong ea valve. Khatello ea thepa ea valve le mocheso o bapisoang le indasteri ea tafole ea li-valve ba ka hare ba tseba hore khetho ea lisebelisoa tsa valve e hloka ho khetha ho ea ka khatello ea boenjiniere ba valve le mocheso o sebetsang, lisebelisoa tse fapaneng tsa khatello le mocheso ha li tšoane, re sheba kamano ea taolo. Batho ba ka hare ho indasteri ea li-valve ba tseba hore khetho ea lisebelisoa tsa valve e hloka ho khethoa ho latela khatello ea boenjiniere le mocheso o sebetsang oa valve. Khatello le tikoloho ea mocheso ea thepa e fapaneng ha e tšoane. Ha re shebeng kamano e fapaneng har'a bona. Khatello ea thepa ea valve le tafole ea papiso ea mocheso Khatello ea lintho tse bonahalang le tafole ea papiso ea mocheso Gray cast iron: Grey cast iron e loketse metsi, mouoane, moea, khase le oli ka khatello ea lebitso PN≤ 1.0mpa le mocheso -10℃ ~ 200 ℃. Likarolo tse tloaelehileng tsa tšepe ea grey cast ke: HT200, HT250, HT300, HT350. Malleable cast iron: E loketse bakeng sa khatello ea lebitso PN≤ 2.5mpa, mocheso oa -30 ~ 300℃ oa metsi, mouoane, moea le oli, lihlahisoa tse sebelisoang hangata ke: KTH300-06, KTH330-08, KTH350-10. ductile iron: E loketse metsi, mouoane, moea le oli ka PN≤4.0MPa le mocheso oa -30 ~ 350 ℃. Mefuta e sebelisoang hangata ke: QT400-15, QT450-10, QT500-7. Ho latela maemo a hajoale a theknoloji ea lapeng, feme e 'ngoe le e' ngoe ha e lekane, 'me hangata basebelisi ha ba bonolo ho etsa liteko. Ho ea ka phihlelo, ho kgothaletswa hore PN≤ 2.5mpa, valve ea tšepe e bolokehe. Acid e hanyetsanang le tšepe e phahameng ea silicon ductile: E loketse mecha ea litaba e senyang ka khatello ea lebitso PN≤ 0.25mpa le mocheso o ka tlase ho 120 ℃. Carbon steel: E loketse metsi, mouoane, moea, hydrogen, ammonia, naetrojene le lihlahisoa tsa petroleum tse nang le khatello ea lebitso PN≤32.0MPa le mocheso -30 ~ 425 ℃. Limaraka tse sebelisoang hangata ke WC1, WCB, ZG25 le tšepe ea boleng 20, 25, 30 le tšepe e tlase ea alloy 16Mn. E loketse metsi, metsi a leoatle, oksijene, moea, oli le mecha e meng ea litaba e nang le PN≤ 2.5mpa, hammoho le mecha ea litaba ea mouoane e nang le mocheso -40 ~ 250 ℃, mofuta o sebelisoang hangata ke ZGnSn10Zn2(tin boronse), H62, HPB59-1 (koporo), QAZ19-2, QA19-4 (boronse ea aluminium). Mocheso o phahameng oa koporo: E loketse lihlahisoa tsa mouoane le peterole ka khatello ea lebitso PN≤ 17.0mpa le mocheso ≤570 ℃. Letšoao le sebelisoang ka tloaelo ZGCr5Mo, 1 cr5m0. ZG20CrMoV, ZG15Gr1Mo1V, 12 crmov WC6, WC9, joalo-joalo Khetho e khethehileng e tlameha ho lumellana le khatello ea valve le litlhaloso tsa mocheso.