Mesh rau Micron: Phau Ntawv Qhia Qhov Kawg Conversion

Nyob rau hauv qhov tseeb - tsav lub ntiaj teb no ntawm industrial filtration, muaj peev xwm los txhais lus ntawmMesh suavthiabMicron Ratingsyog ib qho txuj ci tseem ceeb. Thaum "Mesh" yog hais txog tus naj npawb ntawm cov xov hlau hauv ib nti, "Micron" (micrometer, $\\mu m$) txhais qhov kev ncua deb ntawm cov xov hlau. Qhov kev sib tw rau engineers nyob rau hauv qhov tseeb hais tias ob chav tsev no tsis muaj ib tug ruaj, linear kev sib raug zoo. Vim tias qhov tuab ntawm cov hlau (xaim txoj kab uas hla) tuaj yeem sib txawv heev txawm tias nyob rau hauv tib lub mesh suav, "100-mesh" npo los ntawm ib lub chaw tsim khoom yuav muaj peev xwm sib txawv ntau dua li "100-mesh" screen los ntawm lwm tus. Qhov tsis sib xws no tuaj yeem ua rau muaj qhov yuam kev tseem ceeb hauv cov dej dynamics, ntsuas kev poob siab, thiab kev khaws cov khoom particle.

Phau ntawv qhia no muab cov txheej txheem dav dav rau kev nkag siab txog lej thiab lub cev sib raug zoo ntawm mesh thiab microns. Peb yuav txav mus dhau ntawm cov rooj saib yooj yim los tshawb txog qhov sib txawv uas tswj xyuas qhov tseeb ntawm qhov pom, suav nrog qhov cuam tshuam ntawm cov ntsuas hluav taws xob, cov qauv weave, thiab cov khoom siv thermal expansion. Txawm hais tias koj tab tom ua haujlwm hauv kev ua tshuaj purification, aerospace hydraulics, lossis hnyav -kev kho dej khib nyiab, qhov "Ultimate Conversion Guide" no yuav pab koj nrog cov qauv thiab cov kev pom zoo tsim nyog los qhia meej cov lim dej uas xav tau rau koj daim ntawv thov. Los ntawm kev paub txog cov kev hloov pauv no, koj xyuas kom meej tias koj qhov kev pom zoo ua haujlwm ntawm qhov ua tau zoo tshaj plaws thaum tuav cov qauv kev nyab xeeb siab tshaj plaws.

Mesh suav yog dab tsi?

Mesh suav yog ib chav ntsuas imperial ntawm kev ntsuas siv feem ntau hauv kev lag luam hlau weaving. Nws sawv cev rau tus naj npawb ntawm qhov qhib uas tshwm sim thoob plaws ib nti tawm (25.4 hli) ntawm qhov screen. Txhawm rau nrhiav cov xov tooj suav, tus kws tshaj lij suav los ntawm qhov chaw ntawm ib lub xaim mus rau qhov nruab nrab ntawm ib lub xaim raws nraim ib nti deb. Ib qho mesh suav ntau dua qhia tau tias lub vijtsam zoo dua nrog ntau cov xov hlau thiab qhov qhib me me. Txawm li cas los xij, kev suav mesh ib leeg yog tus nqi "nominal" - nws piav qhia txog cov qauv ntawm cov weave tab sis tsis yog qhov loj ntawm cov khoom nws yuav nres.

Micron (Micrometer) piav qhia

Ib micron ($\\mu m$) yog ib chav metric sib npaug rau ib -millionth ntawm ib lub ' meter ' los yog ib - txhiab ntawm ib millimeter. Hauv kev pom, qhov ntsuas micron txhais tau tiasAperture Loj- qhov chaw ntshiab ntawm cov xov hlau. Qhov no yog qhov ntsuas "tsis muaj tseeb". Yog tias lub lim tau ntsuas ntawm 40 microns, nws yog tsim los tiv thaiv cov khoom uas loj dua 40 microns los ntawm kev hla. Rau qhov kev xav, qhov nruab nrab tib neeg cov plaub hau yog kwv yees li 70 microns tuab, thiab tib neeg lub qhov muag tuaj yeem pom feem ntau mus txog 40 microns yam tsis muaj qhov loj.

Qhov txawv ntawm Nominal thiab Tsis Txaus Siab Kev Ntsuas

Thaum hloov mesh mus rau microns, nws yog ib qho tseem ceeb kom paub qhov txawv ntawm nominal thiab qhov kev ntsuam xyuas. ANominal Micron Ratingyog qhov kwv yees ntawm qhov loj me me uas lub lim tuaj yeem khaws tau ntawm qee qhov kev ua tau zoo (piv txwv li, 90%). IbKev ntsuam xyuas Micronyog txoj kab uas hla ntawm qhov loj tshaj plaws uas tuaj yeem ua rau lub cev dhau los ntawm qhov qhib loj tshaj plaws hauv lub lim. Kev cai hlau mesh cov ntxaij lim dej feem ntau yog tsom rau qhov kev ntsuam xyuas zoo, raws li cov geometry ruaj khov ntawm cov hlau woven muab cov txiaj ntsig zoo dua li cov lim dej hluavtaws.

Lub luag haujlwm ntawm Wire Diameter (d)

Txoj kab uas hla ntawm txoj kab uas hla yog qhov tsis pom kev sib txawv tshaj plaws hauv cov txheej txheem hloov dua siab tshiab. Yog tias koj muaj ob qhov sib txawv 100-mesh cov ntxaij vab tshaus- ib qho ua nrog 0.10 hli hlau thiab ib qho nrog 0.12 hli hlau-qhov 0.12 hli hlau yuav tsim ib lub qhov me me (aperture).

Case A:100 mesh nrog 0.10 hli xaim=154 micron aperture.

Case B:100 mesh nrog 0.12 hli xaim=134 micron aperture. Raws li pom, qhov kev hloov me me hauv cov ntsuas hluav taws xob ua rau 13% qhov sib txawv ntawm qhov pom loj. Qhov no yog vim li cas koj yuav tsum nco ntsoov txheeb xyuas cov kab kab uas hla ua ntej tso siab rau daim ntawv hloov dua siab tshiab.

Universal Conversion Formula

Txhawm rau xam qhov aperture (w) hauv microns, koj yuav tsum siv cov lej hauv qab no:w (microns)=[(25.4 / Mesh suav) - Hlau txoj kab uas hla] * 1000

Cov qauv no tso cai rau koj los xam qhov tseeb micron ntsuas rau txhua qhov kev cai weave. Piv txwv li, yog tias koj muaj 200-mesh screen nrog ib txoj kab uas hla ntawm 0.05 hli:

25.4 / 200=0.127 hli (Qhov no yog Pitch)

0.127 hli - 0.05 hli=0.077 hli (Qhov no yog qhov Aperture hauv mm)

0.077 * 1000=77 microns.

Xam feem pua ​​ntawm Open Area

Qhov qhib cheeb tsam (OA) feem pua ​​​​yog qhov tseem ceeb rau kev txaus siab thiab kev poob siab. Nws sawv cev rau qhov piv ntawm qhov rau tag nrho saum npoo ntawm lub mesh.OA%=[Aperture / (Aperture + Wire Diameter)]^2 * 100Siv 200-mesh piv txwv saum toj no: OA%=[0.077 / (0.077 + 0.05)]^2 * 100=36.6%

Common Stainless Hlau Mesh rau Micron Rooj

Lub rooj no siv cov qauv hlau diameters (ASTM E11) rau stainless hlau hlau daim ntaub.

Rau chav kuaj thiab siab -tech applications, "Ultra-Fine" mesh feem ntau yog siv. Kev ntsuas ntawm no yuav tsum yog qhov tseeb heev, vim tias cov ntxaij vab tshaus no yog siv los muab cov sub- pom cov khoom.

Tsis yog -Square Openings

Plain thiab Twill Dutch weaves tsis muaj square opens. Hloov chaw, cov xov hlau warp yog thicker thiab spaced tawm, thaum lub kaw xov hlau yog thinner thiab tsav nruj ua ke. Qhov no tsim "txoj kev tortuous" los yog ib tug wedge -zoo li tus qhib. Vim tias qhov qhib tsis tiaj tus, koj tsis tuaj yeem siv tus qauv linear formula los nrhiav qhov ntsuas micron.

Absolute vs. Technical Micron Ratings

Rau Dutch weaves, manufacturers muab ib qhoKev ntsuam xyuas Micronraws li kev kuaj iav hlaws dai los yog kev ntsuam xyuas npuas. Piv txwv li, "24 x 110" Dutch weave muaj qhov ntsuas qhov tseeb ntawm kwv yees li 115 microns, thaum "325 x 2300" weave tuaj yeem ncav cuag qhov ntsuas ntawm 2 microns. Thaum hloov dua siab tshiab Dutch weaves, ib txwm cia siab rau cov chaw tsim khoom cov ntaub ntawv kev ua tau zoo dua li kev ntsuas phau ntawv.

Thermal Expansion nyob rau hauv cov txheej txheem kub

Nyob rau hauv siab - daim ntawv thov kub (xws li, polymer extrusion los yog kub gas filtration), cov hlau hlau nthuav dav. Qhov kev nthuav dav no txo ​​qis mesh suav me ntsis thiab hloov pauv qhov aperture loj. Yog tias lub lim tau tsim los rau 20-micron ntsuas ntawm chav tsev kub, nws yuav nthuav mus rau 21 lossis 22 microns ntawm 500 degree. Cov kws tsim khoom yuav tsum suav rau cov khoom Coefficient of Thermal Expansion (CTE) thaum hloov mesh mus rau microns rau cov txheej txheem kub.

Weave Distortion thiab Tension

Yog hais tias lub mesh stretched tshaj ib tug ncej (raws li nyob rau hauv vibratory sieves), cov xov hlau elongate. Qhov no elongation nce qhov aperture loj. 100-mesh npo uas dhau lawm-tensioned yuav ua tau zoo li 90-mesh npo. Kev ntsuas qhov ntsuas "As-Installed" micron yog qhov tseem ceeb rau kev ua kom cov txheej txheem sib xws.

Hnav thiab Corrosion

Nyob rau tib lub sijhawm, cov kua abrasive tuaj yeem ua rau cov xov hlau los ntawm kev yaig lossis corrosion. Raws li txoj kab uas hla (d) txo qis, qhov aperture (w) nce. Qhov no txhais tau hais tias lub lim lub micron ntsuas "drifts" dhau nws lub neej kev pabcuam. Kev saib xyuas tsis tu ncua yuav tsum suav nrog ntsuas txoj kab uas hla ntawm cov xaim kom paub tseeb tias cov lim tsis dhau nws qhov kev tso cai micron kam rau ua.

Matching Particle Size rau Mesh suav

Txhawm rau xaiv cov lim zoo, koj yuav tsum xub paub qhov loj ntawm cov kab mob uas koj xav tshem tawm.

Txheeb xyuas lub hom phiaj particle loj(piv txwv li, 150 microns).

Nrog rau daim ntawv hloov dua siab tshiabnrhiav qhov ze tshaj plaws mesh (piv txwv li, 100 mesh).

Tshawb xyuas cov kab hlaulos xyuas kom meej qhov chaw qhib ua tau raws li koj cov kev xav tau ntws.

Xav txog yam kev nyab xeeb:Feem ntau, engineers xaiv ib lub mesh suav 10-20% finer tshaj lub hom phiaj particle account rau weave deviations.

Kev sib raug zoo ntawm thaj chaw qhib thiab kev poob siab

Kev suav mesh ntau dua tsis yog ib txwm txhais tau tias lub lim dej zoo dua. Yog tias qhov ntsuas micron zoo dhau rau cov kua dej viscosity, "Pressure Drop" ($\\Delta P$) yuav siab dhau, ua rau lub cev tsis ua haujlwm. Siv cov ntaub ntawv hloov dua siab tshiab kom sib npaug particle retention (microns) nrog lub peev xwm txaus (qhib cheeb tsam).

Summary of Key Takeaways

Hloov mesh rau microns yog ntau tshaj li ib qho kev tawm dag zog yooj yim hauv kev saib daim duab. Nws yog ib qho kev suav engineering uas yuav tsum suav rau cov kab kab uas hla, hom weave, thiab kev ua haujlwm. Los ntawm kev siv universal formulaw = [(25.4/M)-d] * 1000, koj tuaj yeem tau txais kev nkag siab meej ntawm koj lub lim dej ua haujlwm. Nco ntsoov tias thaum mesh suav muab cov qauv, qhov ntsuas micron muab cov txiaj ntsig. Xyuas kom koj muaj cov ntaub ntawv raug rau ob qho tib si yog tib txoj hauv kev los lav qhov kev ntseeg tau thiab kev ua haujlwm ntawm koj qhov kev pom kev lag luam.

Txhawm rau saib yuav ua li cas cov qauv no thiab cov qauv hloov pauv hloov mus rau hauv lub ntiaj teb kev ntsuas ntsuas lub tswv yim, rov qab mus rau peb phau ntawv qhia tseem ceeb: