"nti" yog dab tsi: Nti (") yog ib chav ntsuas tshwj xeeb rau Asmeskas lub kaw lus, xws li cov kav hlau, cov li qub, cov flanges, lub luj tshib, cov twj tso kua mis, cov tees, thiab lwm yam, xws li qhov kev qhia tshwj xeeb yog 10″.
Nties (nti, luv li hauv.) 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 tus ntiv tes xoo tib neeg kuj txawv. Hauv xyoo pua 14th, Vaj Ntxwv Edward II tau tshaj tawm "tus qauv raug cai nti".
Nws tau teev tseg tias qhov ntev ntawm peb lub noob loj tshaj plaws uas xaiv los ntawm nruab nrab ntawm pob ntseg barley thiab teeb tsa ua kab yog ib nti.
Feem ntau 1″ = 2.54cm = 25.4mm
DN yog dab tsi: DN yog ib chav ntsuas uas siv ntau hauv Suav teb thiab European systems. Nws kuj yog ib qho kev qhia tshwj xeeb rau kev txheeb xyuas cov kav dej, cov li qub, cov flanges, cov khoom siv yeeb nkab thiab cov twj tso kua mis, xws li DN250.
DN yog hais txog lub nominal diameter ntawm cov yeeb nkab (tseem hu ua nominal diameter), ceeb toom: qhov no tsis yog lub sab nraud lossis lub sab hauv, nws yog qhov nruab nrab ntawm lub sab nraud thiab lub sab hauv, hu ua nruab nrab sab hauv.
Φ yog dab tsi: Φ yog ib chav dav dav, uas yog hais txog txoj kab uas hla sab nraud ntawm cov kav dej, lub luj tshib, cov hlau puag ncig thiab lwm yam khoom siv. Nws kuj tseem tuaj yeem hais tias yog txoj kab uas hla. Piv txwv li, Φ609.6mm txhais tau tias txoj kab uas hla sab nraud ntawm 609.6mm.
Tam sim no peb tau paub txog peb lub units no sawv cev rau dab tsi, qhov sib txuas ntawm lawv yog dab tsi?
Ua ntej tshaj plaws, "Lub ntsiab lus ntawm" DN "yuav luag zoo ib yam li DN, feem ntau nws txhais tau tias lub nominal txoj kab uas hla, qhia qhov loj ntawm cov lus qhia no, thiab Φ yog los ua ke ob qho.
Piv txwv li: yog tias cov yeeb nkab hlau yog DN600, thiab cov yeeb nkab hlau tib yam yog cim nrog nti, nws dhau los ua 24″. Puas muaj kev sib txuas ntawm ob qho?
Cov lus teb yog muaj! Lub nti dav dav yog qhov sib npaug ntawm tus lej integer 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 muaj cov sib txawv, xws li 3″ * 25 = 75, puag ncig mus rau qhov ze tshaj plaws DN80, thiab qee qhov ntiv tes nrog semicolons lossis cov ntsiab lus decimal, 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 zoo li ntawd, tab sis qhov kev suav yog kwv yees li tib yam, feem ntau yog tus nqi teev tseg:
1/2″ = DN15 3/4″ = DN20 1-1/4″ = DN32 1-1/2″ = DN40 2-1/2″ = DN65 3-1/2″ = DN90
Lub sijhawm tshaj tawm: Lub Peb Hlis-10-2022
