Dab tsi yog "inch": Ntiv (") yog ib qho kev qhia tshwj xeeb rau Asmeskas cov kab ke, xws li cov kav hlau, li qub, flanges, lub luj tshib, twj, tees, thiab lwm yam, xws li cov lus qhia yog 10 ".
Ntives (inch, abbreviated as in.) txhais tau tias tus ntiv tes xoo hauv Dutch, thiab ib nti yog qhov ntev ntawm tus ntiv tes xoo. Tau kawg, qhov ntev ntawm tib neeg tus ntiv tes xoo kuj txawv. Nyob rau hauv lub xyoo pua 14th, King Edward II tau muab "tus qauv kev cai lij choj".
Nws tau hais tias qhov ntev ntawm peb cov nplej loj tshaj plaws tau xaiv los ntawm nruab nrab ntawm lub pob ntseg barley thiab teem ua ke yog ib nti.
Feem ntau 1 "= 2.54cm = 25.4mm
DN yog dab tsi: DN yog ib qho kev qhia tshwj xeeb hauv Suav thiab European tshuab. Nws kuj yog ib qho kev qhia tshwj xeeb rau kev txheeb xyuas cov kav dej, li qub, flanges, cov yeeb nkab fittings thiab cov twj, xws li DN250.
DN yog hais txog lub nominal txoj kab uas hla ntawm cov yeeb nkab (tseem hu ua lub nominal txoj kab uas hla), ceeb toom: qhov no tsis yog lub sab nraud txoj kab uas hla los yog lub puab kab uas hla, nws yog qhov nruab nrab ntawm lub sab nraud txoj kab uas hla thiab lub puab txoj kab uas hla, hu ua qhov nruab nrab sab hauv txoj kab uas hla.
Dab tsi yog Φ: Φ yog ib chav tsev dav dav, uas yog hais txog sab nraud ntawm cov kav dej, lub luj tshib, puag ncig steel thiab lwm yam khoom siv. Nws kuj tuaj yeem hais tias yog txoj kab uas hla. Piv txwv li, Φ609.6mm yog hais txog sab nraud ntawm 609.6mm.
Tam sim no peb tau txiav txim siab seb peb chav nyob no sawv cev li cas, qhov kev sib txuas ntawm lawv yog dab tsi?
Ua ntej ntawm tag nrho cov, "Lub ntsiab lus ntawm "DN" yog yuav luag tib yam li ntawm DN, yeej txhais tau tias lub nominal txoj kab uas hla, qhia qhov luaj li cas ntawm no specification, thiab Φ yog muab ob.
Piv txwv li: yog tias cov yeeb nkab steel yog DN600, thiab tib lub yeeb nkab steel yog cim nrog ntiv tes, nws yuav dhau los ua 24 ". Puas muaj kev sib txuas ntawm ob?
Cov lus teb yog yog! Qhov dav ntiv tes yog qhov sib npaug ncaj qha ntawm tus lej los ntawm 25, uas yog sib npaug rau DN, xws li 1 "* 25 = DN25 2" * 25 = 50 4 "* 25 = DN100 thiab lwm yam.
Tau kawg, kuj tseem muaj qhov sib txawv, xws li 3 "* 25 = 75, sib npaug mus rau qhov ze tshaj plaws DN80, thiab qee qhov ntiv tes nrog semicolons lossis decimal cov ntsiab lus, xws li 1/2 "3/4" 1-1/4 "1 -1/2 ″ 2-1 / 2 ″ 3-1 / 2 ″, thiab lwm yam., cov no tsis tuaj yeem suav tau zoo li ntawd, tab sis kev suav yog kwv yees tib yam, qhov tseem ceeb ntawm tus nqi teev:
1/2″ = DN15 3/4″ = DN20 1-1/4″ = DN32 1-1/2″ = DN40 2-1/2″ = DN65 3-1/2″ = DN90
Lub sij hawm xa tuaj: Mar-10-2022
