Kev sib tham txog kev xaiv hom twj tso kua mis ob chav

Ntawm lawv: hg - qhov siab ntawm kev teeb tsa geometric (tus nqi zoo yog nqus mus rau saum, tus nqi tsis zoo yog ntws rov qab);

—Lub taub hau dej siab ntawm qhov chaw teeb tsa (xam li 10.33m nyob rau hauv qhov ntsuas siab ntawm qhov chaw ib txwm muaj thiab dej ntshiab);

hc—kev poob hydraulic nqus; (yog tias cov kav dej nkag luv thiab tsis nyuaj, feem ntau nws yog xam li 0.5m)

—Lub taub hau siab ntawm kev ua pa; (dej ntshiab ntawm chav tsev kub yog xam ua 0.24m)

— NPSH uas tso cai; (kom paub tseeb tias muaj kev nyab xeeb, xam raws li NPSHr × 1.2, NPSHr saib daim ntawv teev npe)

Piv txwv li, NPSH NPSHr = 4m: Ces: hg = 10.33-0.5-0.24-(4 × 1.2) = 4.79 m (qhov tshwm sim ntawm kev daws teeb meem yog tus nqi zoo, nws txhais tau tias nws tuaj yeem nqus tau txog ≤4.79m, uas yog, qib dej nkag tuaj yeem nyob hauv lub impeller Hauv 4.79m hauv qab kab nruab nrab; yog tias nws nyob hauv qab qhov siab tsis zoo, nws yuav tsum tau nchuav rov qab, thiab tus nqi ntawm kev nchuav rov qab yuav tsum ntau dua li tus nqi xam, uas yog, qib dej nkag tuaj yeem siab dua tus nqi xam saum kab nruab nrab ntawm lub impeller).

Qhov saum toj no yog xam raws li qhov kub thiab txias ib txwm muaj, dej ntshiab thiab qhov siab ib txwm muaj. Yog tias qhov kub thiab txias, qhov ceev thiab qhov siab ntawm cov khoom siv tsis zoo, kom tsis txhob muaj cavitation thiab lwm yam teeb meem cuam tshuam rau kev ua haujlwm ib txwm ntawm lub twj tso kua mis, cov nqi sib xws yuav tsum tau xaiv thiab hloov rau hauv cov mis rau kev xam. Ntawm lawv, qhov kub thiab qhov ceev ntawm cov khoom siv raug xam raws li cov nqi sib xws hauv "Vaporization Pressure thiab Density of Water at Different Temperatures", thiab qhov siab raug xam raws li cov nqi sib xws hauv "Altitude thiab Atmospheric Pressure of Majors in the country". Lwm qhov NPSH uas tso cai yog kom muaj kev nyab xeeb, raws li NPSHr × 1.4 (tus nqi no yog tsawg kawg 1.4).

3. Thaum lub siab ntawm lub twj tso kua mis ib txwm yog ≤0.2MPa, thaum lub siab ntawm lub twj tso kua mis + lub taub hau × 1.5 zaug ≤ lub siab, xaiv raws li cov khoom siv ib txwm muaj;

Lub siab nkag + lub taub hau × 1.5 zaug > lub siab tswj, yuav tsum siv cov khoom siv txheem uas ua tau raws li qhov yuav tsum tau ua; yog tias lub siab nkag siab dhau lossis lub siab sim siab dhau, thiab lwm yam uas tsis ua tau raws li qhov yuav tsum tau ua, thov paub meej nrog cov thev naus laus zis los hloov cov khoom siv lossis kho cov pwm thiab ua kom phab ntsa tuab dua;

4. Cov qauv foob siv rau lub twj tso kua mis yog: M7N, M74 thiab M37G-G92 series, uas yuav siv nyob ntawm tus qauv tsim twj tso kua mis, cov khoom siv foob siv rau lub tshuab foob: tawv/mos (tungsten carbide/graphite); thaum lub siab nkag yog ≥0.8MPa, Yuav tsum xaiv lub foob siv sib npaug;

5. Nws raug pom zoo tias qhov kub nruab nrab ntawm lub twj tso kua mis ob chav yuav tsum tsis pub tshaj 120 ° C. Thaum 100 ° C ≤ qhov kub nruab nrab ≤ 120 ° C, lub twj tso kua mis ib txwm yuav tsum tau kho: lub qhov sib khi thiab qhov chaw nqa khoom yuav tsum tau nruab nrog dej txias sab nraum lub qhov txias; tag nrho O-rings ntawm lub twj tso kua mis yog ua los ntawm ob qho tib si: roj hmab fluorine (suav nrog lub tshuab foob).