Qhov yuav tsum tau ua ntawm cov yeeb nkab ncaj "10D upstream thiab 5D downstream" tsis yog ib txoj cai rau cov clamp-on ultrasonic flowmeters, tab sis yog ib qho kev qhia dav dav kom ntseeg tau tias qhov ntsuas tau zoo tshaj plaws. Qhov ntev ntawm cov yeeb nkab ncaj uas xav tau tiag tiag nyob ntawm cov yam xws li hom kev cuam tshuam ntawm cov dej ntws, lub hauv paus ntsiab lus ntawm kev ntsuas (lub sijhawm sib txawv vs. Doppler), thiab qhov yuav tsum tau ua ntawm daim ntawv thov.
1. Vim li cas "10D Upstream & 5D Downstream" thiaj li pom zoo?
Cov ntsuas dej ntws ultrasonic xam tus nqi ntws raws li lub sijhawm nthuav dav (txoj kev sib txawv ntawm lub sijhawm) lossis kev hloov pauv zaus (txoj kev Doppler) ntawm cov nthwv dej ultrasonic hauv cov kua dej. Qhov no vam khom kev ntws ruaj khov, tsim tag nrho turbulent (qhov zoo tshaj plaws, qhov profile velocity symmetric hla lub yeeb nkab hla-section).
Cov khoom siv xws li lub luj tshib, cov tees, cov li qub, lossis cov reducers cuam tshuam cov qauv ntws (ua rau muaj kev sib hloov, kev hloov pauv, lossis kev faib tawm qhov ceev tsis sib xws), uas tuaj yeem ua rau muaj qhov yuam kev ntsuas. Cov lus qhia "10D upstream + 5D downstream" muab qhov chaw txaus rau cov dej ntws uas cuam tshuam kom rov ruaj khov ua ntej nkag mus rau hauv qhov ntsuas ntawm lub 'meter'.
2. Kev Hloov Kho Yooj Yim: Thaum Twg "10D / 5D" Thiaj Li So Tau Los Yog Yuav Tsum Ua Raws Li Qhov Yuav Tsum Tau Ua?
Qhov ntev ntawm cov yeeb nkab ncaj uas xav tau sib txawv nrog rau cov xwm txheej tshwj xeeb, raws li qhia hauv lub rooj hauv qab no:
| Xwm txheej | Yuav Tsum Tau Ntev Ntev ntawm Cov Yeeb Nkab Ncaj | Kev piav qhia |
|---|---|---|
| Kev cuam tshuam me me ntawm cov dej ntws (piv txwv li, 90° lub luj tshib ntev, lub qhov rooj qhib tag nrho) | Sab saud: 5D–8D Hauv qab: 3D-5D | Cov teeb meem me me ploj mus sai dua; cov kav dej luv luv txaus rau kev tswj hwm dej ntws. |
| Kev cuam tshuam loj heev ntawm cov dej ntws (piv txwv li, 90° luv-radius luj tshib, globe valves, tees) | Nce mus rau sab saud: ≥10D Hauv qab dej: ≥5D | Cov kiv cua/eddies hnyav xav tau qhov deb ntev dua kom rov tsim tau cov dej ntws ruaj khov. |
| Cov ntawv thov uas tsis muaj qhov tseeb (piv txwv li, kev saib xyuas cov txheej txheem dav dav, kev taug qab cov dej ntws tsis tseem ceeb) | Sab saud: 3D–5D Hauv qab: 2D–3D | Kev kam rau siab rau qhov yuam kev me me (± 3% – ± 5%) ua rau muaj kev ywj pheej ntau dua. |
| Cov ntawv thov raug siab (piv txwv li, kev sib hais haum lag luam, kev ntsuas zog, kev ntsuas tshuaj) | Sab saud: 10D–15D Cov dej ntws mus rau hauv qab: 5D-8D | Cov kev xav tau ntawm qhov tseeb (± 1% – ± 2%) xav tau cov xwm txheej ntws ze li zoo tagnrho. |
| Doppler hom clamp-on meters | Muaj kev ywj pheej me ntsis (piv txwv li, upstream 5D–8D) | Doppler meters tsis tshua muaj kev cuam tshuam rau qhov tsis sib xws ntawm cov dej ntws me me dua li cov ntsuas sib txawv ntawm lub sijhawm. |
3. Cov Kev Daws Teeb Meem Thaum Cov Yeeb Nkab Ncaj Tsis Txaus
Yog tias qhov chaw kav dej tsawg thiab "10D/5D" tsis tuaj yeem ua tiav, cov kev ntsuas hauv qab no tuaj yeem txo qhov cuam tshuam ntawm kev ntws thiab txhim kho qhov tseeb:
- Nruab cov khoom siv kho kom dej ntws zoo: Cov khoom siv xws li cov raj xa dej, cov honeycomb, lossis cov phaj orifice tuaj yeem kho cov dej ntws uas raug cuam tshuam kom ncaj hauv qhov luv luv (txo cov yeeb nkab ncaj uas xav tau mus rau 3D–5D).
- Ua kom qhov chaw teeb tsa sensor zoo tshaj plaws: Tsis txhob teeb tsa cov sensors ncaj qha rau sab qab ntawm qhov cuam tshuam; yog tias ua tau, muab lawv tso rau sab saud ntawm lub luj tshib/valves (qhov cuam tshuam sab saud muaj kev cuam tshuam tsawg dua li cov sab qab).
- Kho qhov nrug/lub kaum sab xis ntawm lub sensor: Qee cov ntsuas clamp-on siab heev tso cai rau kev kho qhov deb ntawm lub transducer lossis lub kaum sab xis ntawm lub teeb kom them rau qhov tsis sib xws me me ntawm cov qauv ntws.
- Siv cov sensors ntau txoj kev: 2-txoj kev lossis 4-txoj kev clamp-on meters ntsuas qhov ceev ntawm ntau qhov chaw hla lub yeeb nkab, nruab nrab ntawm qhov tsis sib xws ntawm cov qauv ntws uas tshwm sim los ntawm cov yeeb nkab tsis ncaj.
Xaus lus
Txawm hais tias "10D upstream thiab 5D downstream" yog qhov kev nyab xeeb rau feem ntau ntawm cov xwm txheej kev lag luam, clamp-on ultrasonic flowmeters tsis tas yuav tsum muaj qhov ntev no hauv txhua qhov xwm txheej. Qhov tseem ceeb yog kom phim qhov ntev ntawm cov yeeb nkab ncaj rau qib kev cuam tshuam thiab qhov tseeb ntawm daim ntawv thov. Thaum qhov chaw raug txwv, cov khoom siv kho dej lossis ntau txoj kev sensors tuaj yeem them rov qab rau cov yeeb nkab ncaj tsis txaus, kom ntseeg tau tias kev ntsuas kev ua tau zoo.
Lub sijhawm tshaj tawm: Cuaj hlis-04-2025