Qhov txawv ntawm DN, De, φ, PN thiab SDR cim rau ntawm cov yeeb nkab yog dab tsi?

DN/De/D / Φ / PN/qhov sib txawv ntawm SDRS

D: Feem ntau nws hais txog lub cheeb sab hauv ntawm cov yeeb nkab, lub cheeb ntawm lub voj voog sab hauv ntawm phab ntsa yeeb nkab.

DN: hais txog qhov ntsuas txoj kab uas hla, tseem hu ua qhov nruab nrab ntawm txoj kab uas hla sab nraud, uas tsis yog txoj kab uas hla sab nraud lossis txoj kab uas hla sab hauv ntawm cov yeeb nkab, tab sis qhov nruab nrab ntawm txoj kab uas hla sab nraud thiab txoj kab uas hla sab hauv. Qhov no yog cov kav dej thiab cov khoom siv uas muaj txoj kab uas hla tus qauv. Kev siv txoj kab uas hla tus qauv yog qhov zoo rau kev ua kom cov khoom sib xws, thiab yooj yim rau kev tsim qauv, kev tsim khoom, kev kho thiab kev tswj hwm, thiab txo cov nqi tsim khoom. Rau cov yeeb nkab, DN yog qhov loj me uas tsawg dua txoj kab uas hla sab nraud thiab loj dua txoj kab uas hla sab hauv. Sib raug rau txoj kab uas hla tus qauv ntawm cov yeeb nkab, nws txoj kab uas hla sab nraud yog tus nqi ruaj khov, thiab txoj kab uas hla sab hauv sib txawv nrog phab ntsa tuab.

φ: hais txog lub cheeb sab nraud ntawm cov yeeb nkab, uas yog, lub cheeb sab nraud ntawm cov yeeb nkab suav nrog qhov tuab ntawm phab ntsa yeeb nkab. Feem ntau cov yeeb nkab hlau tsis muaj seamless, cov yeeb nkab hlau kauv yog siv los cim qhov loj ntawm φ, cim ua daim ntawv ntawm lub cheeb sab nraud X lub tuab phab ntsa. Piv txwv li, φ 108 x 4 qhia txog cov yeeb nkab nrog lub cheeb sab nraud ntawm 108 hli thiab phab ntsa tuab ntawm 4 hli.

De: hais txog txoj kab uas hla sab nraud ntawm cov kav dej. Txoj kab uas hla sab nraud ntawm PPR, PE thiab POLYPROPYLENE kav dej feem ntau yog cim los ntawm De, feem ntau cim ua daim ntawv ntawm txoj kab uas hla sab nraud X tuab ntawm phab ntsa. Xws li: De110 x 6.6.

Kev sib raug zoo ntawm DN, De thiab φ:
De ntsuas txoj kab uas hla ntawm phab ntsa sab nraud ntawm cov kav dej; DN yog De rho tawm ib nrab ntawm qhov tuab ntawm phab ntsa raj; φ qhia txog txoj kab uas hla ntawm lub voj voog ib txwm muaj.

De, DN, D, phi lawv qhov kev ua haujlwm:
De- PPR, PE yeeb nkab, polypropylene yeeb nkab txoj kab uas hla;
DN - nominal txoj kab uas hla ntawm polyethylene (PVC) yeeb nkab, cam khwb cia hlau yeeb nkab, hlau-yas composite yeeb nkab, galvanized steel yeeb nkab;
D - Nominal txoj kab uas hla ntawm cov yeeb nkab ua los ntawm pob zeb;
ф – Cov yeeb nkab hlau tsis muaj hlau lossis cov yeeb nkab hlau uas tsis yog hlau yuav tsum tau cim "txoj kab uas hla sab nraud × phab ntsa tuab".

PN: hais txog lub siab nominal, uas yog siv los qhia lub siab ntawm cov kav dej, cov khoom siv kav dej, cov li qub thiab lwm yam khoom siv plhaub. Tus lej tom qab los ntawm tsab ntawv PN tsis sawv cev rau tus nqi ntsuas. Piv txwv li, rau PE dej kav dej ntawm PN1.0mpa, 1.0 sawv cev rau qib siab. Lub siab nominal hais txog lub siab ua haujlwm ntawm dej kis ntawm cov kav dej ntawm qhov kub thib ob (20 ℃), uas yog, qhov siab tshaj plaws ua haujlwm tas mus li ua rau ntawm phab ntsa sab hauv ntawm cov kav dej hauv qab qhov xwm txheej ua haujlwm ib txwm muaj. Tam sim no peb feem ntau siv PE dej kav dej faib ua tsib qib siab.

SDR: yog hais txog qhov piv txwv loj lossis qhov piv txwv loj ntawm cov kav dej. SDR ntawm cov kav dej PE yog hais txog qhov sib piv ntawm lub cheeb tsam sab nraud de thiab lub phab ntsa tuab EN ntawm cov kav dej, piv txwv li SDR = de / en. Nws yog ib qho tseem ceeb uas tswj tau qhov tuab ntawm phab ntsa yeeb nkab thiab txiav txim siab qhov muaj peev xwm dais siab sab hauv. Piv txwv li, cim rau ntawm cov kav dej PE: SDR26 PN0.6mpa, SDR21 PN0.8mpa, SDR17 PN1.0mpa, SDR13.6PN1.25mpa, SDR11 PN1.6mpa, thiab lwm yam.

Cov yeeb nkab yas yog cov khoom siv hluavtaws ntxiv rau cov khoom ntxiv los ntawm kev yaj cov khoom ua tiav molding. Cov khoom ntxiv suav nrog plasticizer, stabilizer, filler, roj nplua nyeem, colorant, ultraviolet absorbent, modifier, thiab lwm yam.

Nquag sivyas kav dejyog: cov yeeb nkab polyvinyl chloride tawv (PVC-U), cov yeeb nkab polyethylene siab (PE-HD), cov yeeb nkab polyethylene hla txuas (PE-X), cov yeeb nkab polypropylene copolymer random (PP-R), cov yeeb nkab polybutene (PB), cov yas engineering propylene qing-butadiene-styrene copolymer (ABS) thiab lwm yam. Cov khoom siv sib xyaw ntawm cov yeeb nkab yas txiav txim siab cov yam ntxwv ntawm cov yeeb nkab yas.

1) Qhov zoo tshaj plaws ntawm cov yeeb nkab yas

• Kev ruaj khov tshuaj lom neeg zoo, tsis cuam tshuam los ntawm cov yam ntxwv ib puag ncig thiab cov khoom nruab nrab hauv cov kav dej, tiv taus xeb zoo.•

• Me me thermal conductivity, tsawg thermal conductivity, rwb thaiv tsev kub, zoo zog txuag nyhuv.

• Kev ua haujlwm hydraulic zoo, phab ntsa sab hauv ntawm cov kav dej du, qhov coefficient tsis kam yog me me, nws tsis yooj yim rau kev ntsuas, thaj chaw ntws hauv cov kav dej tsis hloov pauv nrog lub sijhawm, thiab qhov tshwm sim ntawm cov kav dej thaiv yog me me.

• Piv nrog cov yeeb nkab hlau, nws muaj qhov ceev tsawg, cov khoom siv sib dua, kev thauj mus los thiab kev teeb tsa yooj yim, thiab kev saib xyuas yooj yim.••

• Kev khoov ntuj lossis kev khoov txias, kev muab coil tuaj yeem siv los txo cov yeeb nkab sib txuas.

2) Kev cuam tshuam ntawm kev ua tau zoo ntawm cov yeeb nkab yas

• Pvc-u, PP thiab ABS muaj cov khoom siv kho tshuab siab heev thiab suav tias yog "cov raj khov kho" nrog kev teeb tsa qhib zoo dua. Ntawm qhov tsis sib xws, PE, PE-X, PB ua "cov raj yoog tau" tsim nyog rau kev txheej xim tsaus.

• Qhov kub thiab kev tiv taus cua sov ntawm cov yeeb nkab yas txiav txim siab tias PVC-U, PE, ABS tsuas yog siv tau rau cov yeeb nkab dej txias xwb, thaum PE-X, PP, PB siv tau ua cov yeeb nkab dej kub. Thaum lub tsev muaj lub kaw lus muab dej kub thiab kev siv cov yeeb nkab kub thiab txias sib xws, qhov kev tiv taus cua sov ua rau qhov ntsuas tseem ceeb.

• Cov yeeb nkab yas vim muaj cov coefficient ntawm kev nthuav dav thermal siab, tshwj xeeb tshaj yog ua cov yeeb nkab dej kub hauv cov yeeb nkab yas, qhov sib txuas yooj ywm, cov pob qij txha nthuav dav lossis ntau yam khoov thiab lwm yam kev ntsuas thermal compensation ntau dua. PE, PP thiab lwm yam polyolefin yog qhov feem ntau. Yog tias kev tsim kho thiab kev teeb tsa tsis them sai rau qhov no, thiab ua cov kev ntsuas kev siv tshuab sib xws, nws yooj yim tshwm sim rau qhov sib txuas vim yog qhov sib txuas nthuav dav rub tawm qhov teeb meem.

• Vim yog qhov tsis tshua muaj cua sov conductivity, qhov kev ua tau zoo ntawm cov yeeb nkab yas rwb thaiv tsev zoo heev thiab tuaj yeem txo qhov tuab ntawm cov txheej rwb thaiv tsev lossis txawm tias tsis muaj rwb thaiv tsev. Kev sib piv ntawm cov rwb thaiv tsev thermal ntawm cov yeeb nkab yas sib txawv tsis yog tsuas yog cuam tshuam nrog thermal conductivity, tab sis kuj cuam tshuam nrog lawv cov phab ntsa tuab ntawm cov yeeb nkab.