Hauv lub ntiaj teb kev lag luam uas xav tau kev sib khi ua ke, Polytetrafluoroethylene (PTFE) yog ib yam khoom uas muaj nqis rau nws txoj kev tiv thaiv tshuaj lom neeg zoo heev, kev sib txhuam tsawg, thiab muaj peev xwm ua tau ntau yam kub. Txawm li cas los xij, thaum daim ntawv thov hloov ntawm qhov zoo li qub mus rau qhov hloov pauv - nrog rau kev hloov pauv ntawm kev nyuaj siab, kub, thiab kev txav mus tas li - cov yam ntxwv uas ua rau PTFE muaj txiaj ntsig zoo tuaj yeem ua rau muaj kev cov nyom loj heev. Tsab xov xwm no tshawb nrhiav txog lub cev tom qab PTFE tus cwj pwm hauv cov chaw ib puag ncig thiab tshawb nrhiav cov tswv yim tsim qauv uas tau lees paub thiab ua pov thawj uas ua rau nws siv tau zoo hauv cov ntawv thov tseem ceeb los ntawm aerospace mus rau cov kab ke tsheb ua haujlwm siab.
Ⅰ. Qhov Kev Sib Tw Tseem Ceeb: PTFE Cov Khoom Siv Hauv Kev Txav Mus Los
PTFE tsis yog elastomer. Nws tus cwj pwm nyob rau hauv kev ntxhov siab thiab kub txawv ntawm cov ntaub ntawv zoo li NBR lossis FKM, uas xav tau txoj hauv kev tsim qauv sib txawv. Cov teeb meem tseem ceeb hauv kev sib khi dynamic yog:
Kev ntws txias (Creep):PTFE muaj qhov nyiam hloov pauv thaum muaj kev ntxhov siab ntawm lub cev, uas yog ib qho xwm txheej hu ua kev ntws txias lossis kev nkag mus tob. Hauv kev foob dynamic, kev nias tas li thiab kev sib txhuam tuaj yeem ua rau PTFE maj mam hloov pauv, ua rau poob lub zog foob thawj zaug (load) thiab, thaum kawg, kev foob tsis ua haujlwm.
Modulus Elastic qis:PTFE yog ib yam khoom mos mos uas tsis tshua muaj elasticity. Tsis zoo li roj hmab O-ring uas tuaj yeem rov qab mus rau nws cov duab qub tom qab deformation, PTFE muaj kev rov qab tsawg. Hauv cov xwm txheej ntawm kev hloov pauv sai lossis kub hloov pauv, qhov kev ua kom tsis muaj zog no tuaj yeem tiv thaiv lub foob kom tsis txhob sib cuag nrog cov nplaim sealing.
Cov teebmeem ntawm kev nthuav dav thermal:Cov khoom siv dynamic feem ntau muaj kev hloov pauv kub loj heev. PTFE muaj cov coefficient siab ntawm kev nthuav dav thermal. Hauv lub voj voog kub siab, lub foob PTFE nthuav dav, ua rau lub zog sealing nce ntxiv. Thaum txias, nws cog lus, uas tuaj yeem qhib qhov sib txawv thiab ua rau xau. Qhov no yog qhov sib xyaw ua ke los ntawm cov nqi nthuav dav thermal sib txawv ntawm lub foob PTFE thiab lub tsev hlau / ncej, hloov pauv qhov chaw ua haujlwm.
Yog tsis hais txog cov yam ntxwv ntawm cov khoom siv no, lub foob PTFE yooj yim yuav tsis txhim khu kev qha hauv kev ua haujlwm dynamic.
Ⅱ. Kev Dais Teeb Meem Txog Kev Tsim Khoom: Yuav Ua Li Cas Tsim Qauv Ntse Them Rau Cov Kev Txwv Ntawm Cov Khoom Siv
Cov lus teb rau cov teeb meem no ntawm kev lag luam tsis yog tsis lees txais PTFE tab sis los txhim kho nws los ntawm kev tsim kho tshuab ntse. Lub hom phiaj yog los muab lub zog sib khi ruaj khov thiab txhim khu kev qha uas PTFE ib leeg tsis tuaj yeem tswj tau.
1. Cov Ntiv Tes Uas Muaj Zog Rau Lub Caij Nplooj Ntoos Hlav: Tus Qauv Kub Rau Kev Ua Haujlwm Dynamic
Qhov no yog qhov kev daws teeb meem zoo tshaj plaws thiab siv dav tshaj plaws rau cov foob PTFE dynamic. Lub foob uas muaj zog los ntawm lub caij nplooj ntoos hlav muaj lub tsho PTFE (lossis lwm yam polymer) uas qhwv lub caij nplooj ntoos hlav hlau.
Nws Ua Haujlwm Li Cas: Lub caij nplooj ntoos hlav ua haujlwm ua lub zog ruaj khov thiab muaj zog heev. Nws txuas ntxiv thawb lub PTFE di ncauj tawm mus rau sab nraud ntawm qhov chaw kaw. Thaum lub tsho PTFE hnav lossis muaj dej txias, lub caij nplooj ntoos hlav nthuav dav los them, tswj hwm qhov kev sib khi zoo li qub thoob plaws lub neej ntawm lub foob.
Zoo Tshaj Plaws Rau: Cov ntawv thov uas muaj lub voj voog siab sai, qhov kub thiab txias dav, tsis muaj roj nplua nyeem, thiab qhov twg qhov xau qis heev yog qhov tseem ceeb. Cov hom caij nplooj ntoos hlav (cantilever, helical, canted coil) raug xaiv raws li qhov xav tau ntawm lub siab thiab kev sib txhuam.
2. Cov Khoom Siv Sib Xyaws: Txhim Kho PTFE Los Ntawm Sab Hauv
PTFE tuaj yeem sib xyaw nrog ntau yam khoom siv los txhim kho nws cov khoom siv kho tshuab. Cov khoom siv feem ntau suav nrog iav fiber, carbon, graphite, tooj liab, thiab MoS₂.
Nws Ua Haujlwm Li Cas: Cov khoom no txo cov dej txias, ua rau kom tsis txhob hnav, txhim kho kev ua kom sov, thiab txhim kho lub zog compressive ntawm lub hauv paus PTFE. Qhov no ua rau lub foob ruaj khov dua thiab muaj peev xwm tiv taus cov chaw ua qias tuaj zoo dua.
Zoo Tshaj Plaws Rau: Kho kom haum rau kev ua haujlwm ntawm lub foob kom haum rau cov kev xav tau tshwj xeeb. Piv txwv li, cov khoom siv carbon/graphite ua rau lubricity thiab tiv taus kev hnav, thaum cov khoom siv tooj dag ua rau lub thermal conductivity thiab lub peev xwm nqa tau zoo dua.
3. Cov Qauv V-Ring: Kev Sealing Axial Yooj Yim thiab Zoo
Txawm hais tias tsis yog lub foob radial thawj, PTFE-based V-rings zoo heev rau cov ntawv thov dynamic axial.
Yuav Ua Haujlwm Li Cas: Ntau lub V-rings raug muab tso ua ke. Qhov kev nias axial siv thaum lub sijhawm sib dhos ua rau daim di ncauj ntawm cov nplhaib nthuav dav radially, tsim lub zog sealing. Tus qauv tsim muab cov nyhuv them tus kheej rau kev hnav.
Zoo Tshaj Plaws Rau: Tiv thaiv cov bearings tseem ceeb los ntawm kev ua qias tuaj, ua haujlwm ua lub tshuab khawb me me lossis daim di ncauj plua plav, thiab tswj kev txav axial.
Ⅲ. Koj Daim Ntawv Teev Npe Tsim Qauv rau Kev Xaiv Dynamic PTFE Seal
Yuav kom xaiv tau qhov tsim PTFE foob zoo, yuav tsum muaj ib txoj kev ua kom zoo. Ua ntej sab laj nrog koj tus neeg muag khoom, sau cov ntaub ntawv tseem ceeb no rau daim ntawv thov:
Cov Qauv Siab: Tsis yog tsuas yog qhov siab tshaj plaws xwb, tab sis kuj muaj ntau yam (min/max), zaus ntawm lub voj voog, thiab qhov hloov pauv ntawm qhov siab (dP/dt).
Qhov Kub thiab Txias: Qhov kub thiab txias tsawg kawg nkaus thiab siab tshaj plaws, nrog rau qhov ceev ntawm cov voj voog kub.
Hom Kev Txav Dynamic: Rotary, oscillating, lossis reciprocating? Xam qhov ceev (RPM) lossis zaus (cycles/feeb).
Xov Xwm: Cov kua lossis roj twg raug kaw? Kev sib haum xeeb yog qhov tseem ceeb.
Tus Nqi Xaim Tawm Uas Tso Cai: Piav qhia txog qhov xaim tawm siab tshaj plaws uas tso cai (piv txwv li, cc/teev).
Cov Khoom Siv Rau Lub Tshuab: Cov khoom siv rau lub qag thiab lub tsev yog dab tsi? Lawv qhov nyuaj thiab qhov tiav ntawm qhov chaw yog qhov tseem ceeb rau kev hnav.
Tej Yam Ib Puag Ncig: Muaj cov kuab paug uas ua rau tawv nqaij puas, raug UV, lossis lwm yam sab nraud.
Xaus Lus: Tus Qauv Tsim Kom Zoo Rau Kev Ua Haujlwm Uas Xav Tau Ntau
PTFE tseem yog ib yam khoom siv zoo heev rau cov chaw nyuaj. Qhov tseem ceeb rau kev vam meej yog lees paub nws cov kev txwv thiab siv cov kev daws teeb meem engineering zoo los kov yeej lawv. Los ntawm kev nkag siab txog cov ntsiab cai tom qab lub caij nplooj ntoos hlav-energized seals, cov ntaub ntawv sib xyaw, thiab cov geometries tshwj xeeb, cov engineers tuaj yeem txiav txim siab tau zoo uas ua kom ntseeg tau ntev. Ntawm Yokey, peb tshwj xeeb hauv kev siv cov ntsiab cai no los tsim cov kev daws teeb meem sealing siab. Peb qhov kev txawj ntse yog los pab cov neeg siv khoom hla cov kev lag luam nyuaj no los xaiv lossis tsim cov foob uas ua haujlwm tau zoo nyob rau hauv cov xwm txheej dynamic tshaj plaws.
Koj puas muaj daim ntawv thov dynamic sealing uas nyuaj? Qhia rau peb koj cov kev teeb tsa, thiab peb pab neeg engineering yuav muab kev tshuaj xyuas tshaj lij thiab cov lus qhia txog khoom.
Lub sijhawm tshaj tawm: Kaum Ib Hlis-19-2025