Kuvame kuba nebangani labangabuvisisi budlelwane emkhatsini wekucaciswa kwe “DN”, “ .Φ" futsi """. Namuhla, ngitawufingqa budlelwane emkhatsini walaba labatsatfu kuwe, ngetsemba lekukusita!
yini intshi”
Inch (“) yiyunithi levame kusetjentiswa yekucacisa eluhlelweni lwaseMelika, njengemaphayiphi ensimbi, .emavalvu, flanges, tindololwane, emaphampu, tees, njll, njengekucaciswa ngu 10 ′′.
Inch (inch, ifinyetiwe ngekutsi in.) kusho sitfupha ngesiDashi, futsi intshi budze besitfupha. Kuliciniso, budze besitfupha nabo buhlukile. Ngelikhulu lesi-14, iNkhosi Edward II yamemetela “Intshi Lejwayelekile Lesemtsetfweni”. Lokubekiwe kutsi budze betinhlavu letintsatfu letinkhulu letikhetsiwe kusuka emkhatsini wetindlebe tebhali bese tihlelwe ngemugca buyintshi yinye.
Ngalokuvamile 1 ′′ = 2.54 cm = 25.4 mm
Yini i-DN
DN iyunithi yekucacisa levame kusetjentiswa eChina naseYurophu, futsi iphindze ibe yincaciso yekumaka emaphayiphi,emavalvu, emaflanges, tintfo letifakwako, kanye nemaphampu, njenge .DN250.
DN kusho bubanti lobubitwako bephayiphi (lobuphindze batiwe ngekutsi bubanti lobubitwako), caphela: loku akusiko bubanti bangaphandle noma bubanti bangekhatsi, kepha silinganiso sebubanti bangaphandle kanye nebubanti bangekhatsi, lokubitwa ngekutsi bubanti bangekhatsi lobusemkhatsini.
YiniΦ
Φ yiyunithi levamile, lebhekisela ku-diameter yangaphandle yemaphayiphi, noma tindololwane, insimbi leyindingilizi kanye naletinye tintfo.
Ngako-ke yini kuchumana emkhatsini wabo?
Kwekucala, tinshokutsi letibhalwe ngekutsi “”" na “DN” ticishe tifane. Tisho ngalokuyinhloko bubanti lobubitwako, lobukhombisa bukhulu balokucaciswa, futsi .Φ yinhlanganisela yaletintfo letimbili.
Ngokwesibonelo
Sibonelo, uma liphayiphi lensimbi lingu DN600, uma leliphayiphi lensimbi lelifanako libhalwe ngemasentimitha, liba ngu 24 ′′. Kukhona yini kuchumana emkhatsini walaba lababili?
Imphendvulo kutsi yebo! Intshi jikelele inombolo lephelele futsi iphindvwe ngco nga 25 ilingana ne DN, njenge 1 ′′ * 25 = DN25, 2 ′′ * 25 = 50, 4 ′′ * 25 = DN100, njll. emaphuzu lafana ne 1/2 ′′, 3/4 ′′, 1-1/4 ′′, 1-1/2 ′′, 2-1/2 ′′, 3-1/ 2 ′′ njalonjalo, leti angeke tibalwe kanjalo, kepha kubalwa kucishe kufane, ngalokuyinhloko linani lelicacisiwe:
1/2 "=DN15
3/4′′=DN20
1-1/4′′=DN32
1-1/2 "=DN40
"=DN50
2-1/2 "=DN65
3′′=DN80
Sikhatsi sekuposa: Indlovana-03-2023
