Txoj kev "pipe-nyob rau hauv-pipe" yog ib qho txheej txheem rau kev tsim cov kav loj -inch insulated kav. Nws suav nrog kev ntxig cov yeeb nkab steel rau hauv ib qho kev tiv thaiv sab nrauv thiab sau qhov chaw nruab nrab ntawm lawv nrog polyurethane ua npuas ncauj. Ib qho tseem ceeb, txawm tias tsis pom tseeb, cov khoom hauv cov txheej txheem no yog qhov kev txhawb nqa spacer.
Thaum tsim khoom, cov kav dej insulated tau khaws cia thiab thauj mus rau hauv txoj haujlwm kab rov tav. Yog tias tsis muaj kev txhawb nqa, cov yeeb nkab steel yuav so rau hauv qab ntawm lub qhov rooj sab nrauv, ua rau cov txheej txheem ua npuas dej tsis sib xws -thicker rau saum thiab thinner hauv qab - uas cuam tshuam rau thermal rwb thaiv tsev kev ua tau zoo. Tsis tas li ntawd, thaum lub sij hawm ua npuas ncauj txheej txheem, cov yeeb nkab steel yuav hloov los yog wobble, exacerbating lub unevenness ntawm npuas txheej. Yog li ntawd, cov kev txhawb nqa yuav tsum tau khi nyob ib ncig ntawm cov yeeb nkab steel- feem ntau ntawm ob mus rau peb metres - kom tuav nws nyob hauv nruab nrab ntawm lub qhov rooj sab nrauv. Qhov no ua kom cov npuas dej puv qhov chaw annular uniformly, guaranteeing zoo rwb thaiv tsev thickness.
Cov ntaub ntawv txhawb nqa sib txawv, xws li polyurethane thiab nylon rau hlau. Yas txhawb nqa txaus rau lub teeb yuag, me me - txoj kab uas hla cov kav dej, qhov loj - txoj kab uas hla -vim lawv qhov hnyav loj - xav tau cov hlau txhawb nqa kom muaj peev xwm txaus- cov kabmob. Qhov siab ntawm qhov kev txhawb nqa txiav txim siab qhov kawg thickness ntawm cov npuas npuas txheej thiab tau teev tseg thaum lub sij hawm tsim qauv raws li cov yeeb nkab txoj kab uas hla thiab rwb thaiv tsev yuav tsum tau.
Thaum txhawb daws qhov teeb meem ntawm qhov chaw, lawv kuj qhia txog qee yam kev cov nyom. Kev txhawb nqa hlau ua kom sov sai, tsim kom muaj "thermal choj" qhov twg cov cua sov tawm ntawm cov yeeb nkab steel mus rau sab nrauv thiab ploj. Txhawm rau txo qhov no, qee qhov kev txhawb nqa muaj cov thermal rwb thaiv tsev ntawm cov ntsiab lus sib cuag lossis yog tsim los ntawm cov khoom siv nrog qis thermal conductivity. Thaum lub sij hawm ua npuas dej, qhov sib xyaw ntawm cov khoom siv tshuaj (polyol thiab isocyanate) ua rau muaj kev cuam tshuam quab yuam; Yog tias kev txhawb nqa tsis ruaj ntseg, lawv tuaj yeem hloov pauv, ua rau muaj qhov tsis xws luag hauv cov npuas npuas. Cov kev txhawb nqa tsis raug tso cai kuj tseem tuaj yeem tso cov cim rau ntawm phab ntsa sab hauv ntawm lub qhov rooj sab nrauv.
Vim yog cov kev txwv no, cov tshuaj tsuag -thiab- txheej txheem qhwv tau pib hloov cov yeeb nkab- hauv - yeeb nkab txoj kev hauv qee qhov haujlwm hauv xyoo tas los no. Cov tshuaj tsuag-thiab- txheej txheej txheej qhwv tshem tawm qhov xav tau kev txhawb nqa, ua rau cov txheej txheem ua npuas dej tsis tu ncua tsis pub muaj teeb meem thermal bridging thiab kev pheej hmoo ntawm kev hloov pauv. Txawm hais tias lub spacer tsuas yog ib qho me me nyob rau hauv cov yeeb nkab-hauv- yeeb nkab sib dhos, nws cuam tshuam rau qhov sib xws ntawm cov txheej txheem rwb thaiv tsev, qhov loj ntawm qhov kub poob, thiab kev ruaj ntseg ntawm cov txheej txheem tsim khoom. Cov yam ntxwv xws li kev xaiv cov khoom siv, qhov sib nrug ceev, thiab cov txheej txheem ntawm kev kho ncaj qha txiav txim siab qhov kawg ntawm cov yeeb nkab insulated.