Chii chinonzi "inch": Inch (") inzvimbo yakajairwa yeAmerican system, senge pombi dzesimbi, mavharuvhu, maflange, magokora, pombi, matei, nezvimwe, senge rondedzero i10 ″.
Inches (inch, shorted as in.) zvinoreva chigunwe muchiDutch, uye inch imwe kureba kwechigunwe. Chokwadi, kureba kwechigunwe chemunhu kwakasiyanawo. Muzana ramakore rechi 14, King Edward II akapa "yakajairwa pamutemo inch".
Zvinonzi hurefu hwetsanga nhatu huru dzakasarudzwa kubva pakati pehura hwebhari uye dzakarongwa mumutsara inchi imwe.
Kazhinji 1″=2.54cm=25.4mm
Chii chinonzi DN: DN inowanzoshandiswa kududzira unit muChinese neEuropean system. Iyo zvakare inotsanangurwa yekuzivisa mapaipi, mavharuvhu, maflange, pombi fittings uye pombi, senge DN250.
DN inoreva dhayamita rezita repombi (inozivikanwawo sezita rekuti dhayamita), cherechedza: iyi haisi iyo dhayamita yekunze kana dhayamita yemukati, iavhareji yedhayamita yekunze uye dhayamita yemukati, inonzi avhareji yemukati dhayamita.
Chii chinonzi Φ: Φ inhengo yakajairika, iyo inoreva kureba kwekunze kwepombi, magokora, simbi yakatenderera uye zvimwe zvinhu. Inogonawo kunzi dhayamita. Semuenzaniso, Φ609.6mm inoreva dhayamita rekunze re609.6mm.
Zvino zvataona kuti zvikamu zvitatu izvi zvinomiririrei, chii chiri kubatana pakati pazvo?
Chekutanga, "Zvinorehwa ne"DN" zvakada kufanana neizvo zveDN, chaizvoizvo zvinoreva dhayamita yezita, zvichiratidza ukuru hwechirevo ichi, uye Φ ndeyekubatanidza zviviri izvi.
Semuyenzaniso: kana pombi yesimbi iri DN600, uye imwe pombi yesimbi yakanyorwa nemainches, inova 24″. Pane kubatana here pakati pezviviri izvi?
Mhinduro ndihongu! Iyo inchi yakajairika ndiko kuwanda kwakananga kweiyo nhamba ne25, iyo yakaenzana neDN, senge 1″*25=DN25 2″*25=50 4″*25=DN100 zvichingodaro.
Ehe, kune zvakare akasiyana, senge 3 ″ * 25 = 75, yakatenderedzwa kune iri pedyo DN80, uye mamwe mainji ane semicolons kana mapoinzi egumi, senge 1/2 ″ 3/4 ″ 1-1/4 ″ 1. -1/2 ″ 2-1 /2″ 3-1/2″, nezvimwewo, izvi hazvigone kuverengerwa zvakadaro, asi kuverenga kwakada kufanana, kunyanya kukosha kwakataurwa:
1/2″=DN15 3/4″=DN20 1-1/4″=DN32 1-1/2″=DN40 2-1/2″=DN65 3-1/2″=DN90
Nguva yekutumira: Mar-10-2022
