Idayamitha yevalvu Φ, idayamitha ye-DN, i-intshi” Ngaba uyakwazi ukuzohlula ezi yunithi zibalulekileyo?

Kuhlala kukho abahlobo abangaqondi ubudlelwane phakathi kwenkcazo ye "DN", "Φ” kunye “”.” Namhlanje, ndiza kushwankathela ubudlelwane phakathi kwakho kwezi zintathu, ngethemba lokukunceda!

yintoni i-intshi"

I-intshi (“) yiyunithi yenkcazelo esetyenziswa ngokuqhelekileyo kwinkqubo yaseMelika, njengemibhobho yentsimbi,iivalve, iiflange, iingqiniba, iimpompo, iitiyi, njl. njl., ezinje ngengcaciso yi-10″.

I-intshi (i-intshi, efinyeziweyo njenge-in.) ithetha ubhontsi kwisiDatshi, kwaye i-intshi bubude bobhontsi. Ewe, ubude bobhontsi bukwahlukile. Ngenkulungwane ye-14, uKumkani u-Edward II wapapasha "i-Inch yoMthetho eStandard". Ummiselo kukuba ubude beenkozo ezintathu ezinkulu ezikhethiweyo phakathi kwezikhwebu zebhali kwaye zihlelwe ngokulandelelana yi-intshi enye.

Ngokubanzi 1″=2.54cm=25.4mm

Yintoni i-DN

I-DN yiyunithi yenkcazo esetyenziswa ngokuqhelekileyo kwiinkqubo zaseTshayina nakwiYurophu, kwaye ikwayinkcazo yokumakisha imibhobho,iivalve, iiflange, izinto ezifakwayo, kunye neempompo, ezifanaDN250.

I-DN ibhekiselele kwidayamitha yesiqhelo yombhobho (ekwabizwa ngokuba yi-diameter ye-nominal), qaphela: oku akusiyo i-diameter yangaphandle okanye i-diameter yangaphakathi, kodwa i-avareji ye-diameter yangaphandle kunye ne-diameter yangaphakathi, ebizwa ngokuba yi-avareji ye-diameter yangaphakathi.

Yintoni iΦ

Φ yiyunithi eqhelekileyo, ebhekisela kububanzi bangaphandle beepayipi, okanye i-elbows, intsimbi ejikelezayo kunye nezinye izinto.

Ngoko ke yintoni unxibelelwano phakathi kwabo?

Okokuqala, iintsingiselo eziphawulwe ngo-“”” kunye “no-DN” ziphantse zafana.Φ yindibaniselwano yezi zimbini.

umzekelo

Umzekelo, ukuba umbhobho wentsimbi yi-DN600, ukuba umbhobho wentsimbi ofanayo uphawulwe ngee-intshi, uba ngama-24″. Ngaba kukho unxibelelwano phakathi kwezi zimbini?

Impendulo nguewe! I-intshi ngokubanzi yinani elipheleleyo kwaye iphindaphindwe ngokuthe ngqo ngama-25 ilingana ne-DN, efana no-1″*25=DN25, 2″*25=50, 4″*25=DN100, njalo njalo. Kakade, kukho ezahlukeneyo ezifana no-3″ *25=75 Ukusangqa yi-DN80, kwaye kukho ii-intshi ezine-semicolons okanye amanqaku e-decimal afana no-1/2″, 3/4″, 1-1/4″, 1-1/2″, 2-1/2″ , 3-1/ 2″ njalo njalo, ezi azinakubalwa ngolo hlobo, kodwa ubalo luphantse lufane, ngokwesiseko ixabiso elikhankanyiweyo:

1/2″=DN15

3/4″=DN20

1-1/4″=DN32

1-1/2″=DN40

2″=DN50

2-1/2″=DN65

3″=DN80