Ububanzi bevalvu Φ, ububanzi beDN, intshi” Ngaba ungazahlula ezi yunithi zeenkcukacha?

Kudla ngokubakho abahlobo abangaqondiyo ulwalamano phakathi kweenkcukacha ze-“DN”, “Φ"kunye" ". Namhlanje, ndiza kushwankathela ubudlelwane phakathi kwezi zintathu, ndinethemba lokukunceda!

yintoni i-intshi”

I-intshi (“) yinxalenye yeenkcukacha esetyenziswa kakhulu kwinkqubo yaseMelika, njengemibhobho yentsimbi,iivalvu, iiflange, iingqiniba, iipompo, ii-tee, njl.njl., njengoko iinkcukacha ziyi-10″.

I-intshi (intshi, efinyeziweyo njenge-in.) ithetha ubhontsi ngesiDatshi, kwaye i-intshi bubude bobhontsi. Kakade ke, ubude bobhontsi nabo bahlukile. Kwinkulungwane ye-14, uKumkani uEdward II wapapasha "i-intshi esemgangathweni yezomthetho". Ummiselo kukuba ubude beenkozo ezintathu ezinkulu ezikhethwe phakathi kwezikhwebu zerhasi kwaye zicwangciswe ngokulandelelana yi-intshi enye.

Ngokubanzi 1″=2.54cm=25.4mm

Yintoni i-DN

I-DN yiyunithi yeenkcukacha esetyenziswa kakhulu kwiinkqubo zaseTshayina naseYurophu, kwaye ikwayinkcazo yemibhobho yokumakisha,iivalvu, iiflange, izixhobo, kunye neempompo, ezifanaDN250.

I-DN ibhekisa kububanzi obuqhelekileyo bombhobho (okwaziwa ngokuba bububanzi obuqhelekileyo), qaphela: obu ayisiyiyo ububanzi obungaphandle okanye ububanzi obungaphakathi, kodwa bumyinge wobubanzi obungaphandle kunye nobubanzi obungaphakathi, obubizwa ngokuba bububanzi obuphakathi obuphakathi.

Yintoni iΦ

Φ yiyunithi eqhelekileyo, ebhekisa kububanzi bangaphandle bemibhobho, okanye iingqiniba, intsimbi ejikelezileyo kunye nezinye izinto.

Ngoko ke yintoni edibanisa nabo?

Okokuqala, iintsingiselo eziphawulwe ngo-"" kunye no-"DN" ziphantse zifane. Ngokusisiseko zithetha ububanzi obuqhelekileyo, obubonisa ubungakanani bale nkcazelo, kunyeΦ ludibaniso lwezi zimbini.

umzekelo

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

Impendulo ithi ewe! I-intshi eqhelekileyo yi-integer kwaye iphindaphindwe ngokuthe ngqo ngama-25 ilingana ne-DN, efana ne-1″*25=DN25, 2″*25=50, 4″*25=DN100, njl. Ewe, kukho ezahlukeneyo ezifana ne-3″*25=75 Ukurhangqa yi-DN80, kwaye kukho ii-intshi ezithile ezinee-semicolons okanye ii-decimal points ezifana ne-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, ngokusisiseko ixabiso elichaziweyo:

1/2″=DN15

3/4″=DN20

1-1/4″=DN32

1-1/2″=DN40

2″=DN50

2-1/2″=DN65

3″=DN80