Kab lus no yuav tham txog yuav ua li cas kom nkag siab qhov tseeb Pore Loj Tswj thiab Bubble Point Testing.
Hauv kev yuav khoom thiab kev siv cov hmoov sintered lim cov ntsiab lus, ib qho ntawm cov teeb meem feem ntau tseem tsis tau pom dua yog:
Nominal rating ≠ qhov tseeb pom tseeb.
Ntau tus neeg siv tau tshaj tawm tias txawm tias lawv yuav "5 μm" sintered stainless hlau lim, pom cov khoom tseem tshwm sim hauv qab, lossis qhov siab poob siab tshaj qhov xav tau. Tsis tas li ntawd, cov txheej txheem tseem ceeb raug kev txom nyem los ntawm cov khoom tsis yog -kev sib raug zoo, cov khoom siv clogging, lossis txawm tias kaw.
Qhov teeb meem nyob qhov twg? Cov lus teb feem ntau nyob hauv ob lub ntsiab lus:qhov ntsuas qhov tseebthiabnpuas taw tes kuaj.
Vim li cas "5 μm" Ua "20 μm" hauv Kev Xyaum?
Ntau lub tuam txhab kos npe "5 μm" ua ibnominal ntsuam xyuas.
Nominal ntsuam xyuas yog xoob txhais tau tias - nws feem ntau txhais tau tias cov xov xwm tuaj yeem ntes taufeem ntau(piv txwv li, 90-98%) ntawm qhov me me, tab sis tsis yog tag nrho.
Dab tsi tiag tiag txiav txim siab kev ua tau zoo yog qhovqhov ntsuas qhov tseeb, feem ntau txhais raws li particle txoj kab uas hla uas yog khaws cia nrogNtau dua lossis sib npaug rau 99.9% kev ua haujlwm.
Hmoov sintered lim yog tsim los ntawm compacting thiab siab -kub sintering hlau hmoov (xws li, 316L, Ti). Lawv pore qauv muaj3D irregular tortuous channels. Kev tswj tsis zoo sintering tuaj yeem ua rau:
●Wide hmoov loj faib → coexistence ntawm nplua thiab ntxhib pores
● Kev kub tsis raug sintering lossis lub sijhawm → hauv zos dhau -sintering lossis qis dua -sintering
● Tsis yog -cov ntaub ntawv compaction ntom → tsis sib xws porosity faib
Qhov tshwm sim: lub lim cim raws li 5 μm yuav muaj qhov pore loj tshaj plaws txog 20 μm.
| Hom | Lus Txhais Standard | Retention Efficiency | Tus Neeg Sawv Cev Kev Xeem | Tus nqi tiag tiag thaum cim 5 μm |
| Nominal Rating | Vague (vary los ntawm cov chaw tsim khoom) | 90–98% | Tsis muaj kev sib koom ua ke | 10–20 μm |
| Kev Ntsuam Xyuas | Rigorous (Ntau dua lossis sib npaug rau 99.9%) | Ntau dua lossis sib npaug li 99.9% | Bubble Point / Sib tw kab mob |
5–7 μm |
Qhov sib txawv ntawm Nominal thiab Tsis Txaus Siab
Yuav Ua Li Cas Kom Pom Qhov Tseeb Tseeb Qhov Loj? - Bubble Point Test
Txoj kev paub tab thiab paub tsis meej tshaj plaws uas tsis yog -kev puas tsuaj hauv kev lag luam yognpuas point test.
Nws yog nyob ntawmphenomena ntawm capillarythiab covHluas -Laplace equation:
Qhov twg:
P=qhov tsawg kawg nkaus siab los thawb roj los ntawm qhov loj tshaj plaws pore (npuas taw tes siab)
= nto nro ntawm cov kua xeem
θ=lub kaum sab xis
D=qhov siab tshaj pore txoj kab uas hla
Txheej txheem:
Ua kom ntub cov lim dej nrog cov kua dej ntawm qhov chaw paub qhov nro. Maj mam nce cov pa roj. Sau lub siab thaum thawj cov npuas tsis tu ncua tshwm sim.
Ces, xam covqhov siab tshaj qhov porelos txiav txim seb lub caij ua tau raws li qhov yuav tsum tau muaj qhov ntsuas qhov tseeb.
Common Test Liquid Parameters (20 degree)
| Test kua | Surface Tension (mN / m) | Cov khoom siv sib xws | Yam ntxwv |
| Isopropyl cawv (IPA) | 21.7 | Stainless hlau, Ti, Ni | Ceev kom qhuav, dav siv |
| Perfluorinated kua (piv txwv li, FC-40) | 16–18 | Tag nrho cov khoom siv hlau sintered | Tsis yog -residue, tsawg corrosion |
| DI dej + 0.1% wetting agent | ~30 | Stainless hlau | Kev nyab xeeb, tus nqi qis |
Tsim nyog vs. Tsis tsim nyog lim: Cov ntaub ntawv sib piv
Ntsuas Bubble Point Cov Ntaub Ntawv rau Ob 5 μm Tsis Muaj -Rated Sintered SS Lim
| Parameter | Tsim Nyog (Tau Txais A) | Tsis tsim nyog (Cov Chaw Tsim Khoom B) |
| Kev ntsuas ntsuas | 5 μm (tsis muaj) | 5 μm (npe) |
| Bubble point siab (IPA) | 1 Ntau dua lossis sib npaug rau 4.5 kPa | 1.2 kPa: ua |
| Xam qhov siab tshaj qhov pore loj | Tsawg dua los yog sib npaug li 6.2 μm | ≈21.8 μm |
| Kev tuav pov hwm tiag tiag (5 μm hais) | 99.95% | ~93% |
| Downstream particle mob | Hla | Pom pom muaj kab mob |
Faj seeb: IPA nto nro=21.7 mN/m, lub kaum sab xis tiv tauj 0℃.
Cov mis pore loj tshaj plaws: D=4 /P
Schematic piav qhia (tuaj yeem npaj tau manually):
◆ Daim duab 1: Npuas taw tes nkhaus ntawm qhov tsim nyog lim - qhov pom tseeb inflection hauv qhov siab - ntws nkhaus ntawm ~ 4.5 kPa.
◆ Daim duab 2: Npuas taw tes nkhaus ntawm cov lim dej tsis tsim nyog - airflow pib ntawm 1.2 kPa, nkhaus nce maj mam, qhia tias muaj feem ntau ntawm cov pores loj.
Peb Cov Lus Pom Zoo rau Kev Muag Khoom & Pab Pawg Engineering
Qhia meej qhov kev ntsuas ntsuas hauv koj daim ntawv cog lus
Xav kom tus neeg muag khoom hais kom meej meej seb qhov kev ntsuam xyuas nominal los yog qhov tseeb, thiab pom zoo rau qhov kev lees txais npuas tus nqi.
Thov daim ntawv qhia ua npuas ncauj
Txhua batch lossis ib tus neeg lim dej yuav tsum tuaj nrog ntsuas qhov ntsuas qhov ntsuas siab, tsis yog tsuas yog thov qhov pore loj.
Ua kom nrawm ntawm - qhov kev txheeb xyuas qhov chaw
Wet the filter with IPA, slowly apply gas pressure, and observe the bubble point pressure. If it deviates >30% ntawm tus neeg muag khoom thov, siv ceev faj.
Xaus
Tus nqi tseem ceeb ntawm hmoov sintered lim ntsiab lus nyob hauv aruaj khov, tswj tau qhov pore qauv.
"5 μm" tsis txhais hais tias 5 μm - tshwj tsis yog tias muaj pov thawj los ntawm qhov ntsuas npuas.
Raws li cov chaw tsim khoom, peb tsis yog muab cov ntsiab lus lim; peb xantsuas tau thiab paub tseeb pom precision.
Yog tias koj tab tom tawm tsam nrog kev xaiv lim lossis tsis txaus siab, thov hu rau peb rau kev qhia ua npuas ncauj los yog kev pabcuam kuaj dawb.
