Yintoni idayamitha yesiqhelo?

Ngokuqhelekileyo, ububanzi bombhobho bunokwahlulwa kwi-diameter yangaphandle (De), i-diameter yangaphakathi (D), i-diameter ye-nominal (DN).
Ngezantsi ukunika umahluko phakathi kwale mahluko "De, D, DN".

I-DN yi-diameter yegama lombhobho

Qaphela: Lo ayingodayamitha yangaphandle okanye idiameter yangaphakathi; kufuneka inxulumane nophuhliso lwakwangoko lobunjineli bemibhobho kunye neeyunithi ze-impiriyali; ngokuqhelekileyo isetyenziselwa ukuchaza umbhobho wentsimbi, ohambelana neeyunithi zobukhosi ngolu hlobo lulandelayo:

Umbhobho we-4-part: 4/8 intshi: DN15;
Umbhobho wemizuzu emi-6: 6/8 intshi: DN20;
Ipayipi ye-intshi eyi-1: i-intshi eyi-1: DN25;
I-intshi ezimbini ipayipi: 1 kunye ne-1/4 intshi: DN32;
Umbhobho wesiqingatha-intshi: 1 kunye ne-1/2 intshi: DN40;
Ipayipi ye-intshi ezimbini: i-intshi ezi-2: DN50;
Umbhobho we-intshi ezintathu: i-intshi ezi-3: i-DN80 (iindawo ezininzi nazo zibhalwe njenge-DN75);
Umbhobho we-intshi ezine: i-intshi ezi-4: DN100;
Amanzi, umbhobho wentsimbi wokuhambisa irhasi (umbhobho wentsimbiokanye umbhobho wensimbi ongeyo-galvanized), umbhobho wentsimbi, umbhobho odibeneyo wensimbi-yeplastiki kunye ne-polyvinyl chloride (PVC) umbhobho kunye nezinye izinto zombhobho, kufuneka ziphawulwe nge-diameter yegama elithi "DN" (njenge-DN15, DN20).

 

I-De ngokuyintloko ibhekisela kububanzi obungaphandle bombhobho
Ukusetyenziswa ngokubanzi kwe-De labeling, kufuneka ifakwe kwimo yobukhulu obungaphandle be-X ubukhulu bodonga;

Isetyenziswa kakhulu ukuchaza:umbhobho wentsimbi ongenamthungo, i-PVC kunye neminye imibhobho yeplastiki, kunye neminye imibhobho efuna udonga olucacileyo.
Thatha umbhobho wentsimbi odityanisiweyo odityanisiweyo njengomzekelo, nge-DN, De iindlela ezimbini zokulebula zilandelayo:
DN20 De25×2.5mm
DN25 De32×3mm
DN32 De40×4mm
DN40 De50×4mm

......

 

I-D ibhekisa ngokubanzi kwidayamitha yangaphakathi yombhobho, d ibonisa i-diameter yangaphakathi yombhobho wekhonkrithi, kwaye Φ ibonisa ububanzi besangqa esiqhelekileyo.

Φ inokuphinda ibonise ububanzi bangaphandle bombhobho, kodwa ke kufuneka iphinde iphindwe ngobuninzi bodonga.
Ngokomzekelo, i-Φ25 × 3 ithetha umbhobho onobubanzi obungaphandle be-25mm kunye nobukhulu bodonga lwe-3mm.
Umbhobho wentsimbi ongenamthungo okanye umbhobho wentsimbi ongeyontsimbi, kufuneka ubhalwe “ububanzi obungaphandle × ubukhulu bodonga”.
Umzekelo: Φ107×4, apho Φ inokushiywa khona.
I-China, i-ISO kunye ne-Japan inxalenye yophawulo lombhobho wentsimbi usebenzisa imilinganiselo yobukhulu bodonga ukubonisa ukutyeba koluhlu lwemibhobho yentsimbi. Ngolu hlobo lombhobho wensimbi, indlela yokubonakalisa umbhobho ngaphandle kobubanzi × ubukhulu bodonga. Umzekelo: Φ60.5×3.8

De, DN, d, ф yoluhlu olwahlukeneyo lwentetho!
De-- PPR, PE umbhobho, polypropylene umbhobho OD
DN -- umbhobho we-polyethylene (PVC), umbhobho wentsimbi, umbhobho wentsimbi-yeplastiki ehlanganisiweyo, umbhobho wentsimbi ekhandisiweyo.
d -- umbhobho wekhonkrithi ubukhulu becala
ф -- ingenamthungo umbhobho wentsimbi nominal ubukhulu