Khuyini "intshi": I-intshi (") yiyunithi ejwayelekileko yokuhlathulula ihlelo le-Amerikha, njengamapayipi wensimbi, amavalvu, ama-flange, ama-elbow, amapompo, ama-tee, njll., njengokuthi ukuhlathulula kungu-10′′.
Intjhies (intshi, efinyeziwe njenge-in.) kutjho isithupha ngesi-Dutch, begodu i-intshi yinye ubude besithupha. Kuliqiniso, ubude besithupha somuntu nabo buhlukile. Ngekhulu leminyaka ye-14, iKosi u-Edward II yakhipha "i-intjhi esemthethweni ejwayelekileko".
Kubekwe bona ubude bamabele amathathu amakhulu akhethwe phakathi kwendlebe yebhali begodu ahlelwe ngokulandelana yi-intjhi yinye.
Ngokuvamileko 1′′=2.54cm=25.4mm
Khuyini i-DN: I-DN yiyunithi esetjenziswa khulu eenhlelweni ze-China neze-Europe. Ibuye ibe yindlela yokukhomba amapayipi, amavalvu, amafletjhi, amaphayiphi wokufakwa kanye namapompo, afana ne-DN250.
I-DN itjho ububanzi bepayipi (eyaziwa nangokuthi ububanzi obubizwako), qaphela: lokhu akusibo ububanzi bangaphandle nofana ububanzi bangaphakathi, kulisilinganiso sobubanzi bangaphandle nobubanzi bangaphakathi, okubizwa ngokuthi bubanzi bangaphakathi obuphakathi.
Yini Φ: Φ iyunithi jikelele, okubhekisela ububanzi bangaphandle amapayipi, izingalo, insimbi round nezinye izinto. Kungabuye kuthiwe ububanzi. Ukwenza isibonelo, i-Φ609.6mm itjho ububanzi bangaphandle obungu-609.6mm.
Njengombana sesitholile bona amayunithi amathathu la ajameleni, khuyini ukuhlobana hlangana nawo?
Kokuthoma, “Ihlathululo ye-“DN” ipheze ifane neye-DN, ngokuyisisekelo itjho ububanzi obubizwako, okutjengisa ubukhulu balokhu kucaciswa, begodu i-Φ kuhlanganisa kokubili.
Ukwenza isibonelo: nangabe ipayipi yensimbi yi-DN600, begodu ipayipi yensimbi efanako itshwaywe ngamasentimitha, iba yi-24′′. Ingabe kukhona ukuhlobana hlangana nalokhu kokubili?
Ipendulo nguyebo! I-intshi ejwayelekileko kukuphindaphindwa okuqondileko kwenani elipheleleko ngo-25, okulingana ne-DN, njenge-1′′*25=DN25 2′′*25=50 4′′*25=DN100 njalonjalo.
Kuliqiniso, kunezinye ezihlukileko, ezifana no-3′′*25=75, eziyindilinga zibe yi-DN80 eseduze, begodu amanye amasentimitha anama-semicolons nofana amaphuzu wedesimali, afana ne-1/2′′ 3/4′′ 1-1/4′′ 1-1/2′′ 2-1 /2′′ 3-1/2′′ njll, angeze babalwa njengalokho. kodwana ukubala kuyafana, ngokuyisisekelo inani eliveziweko:
1/2′′=DN15 3/4′′=DN20 1-1/4′′=DN32 1-1/2′′=DN40 2-1/2′′=DN65 3-1/2′′=DN90
Isikhathi sokuposa: Mar-10-2022
