Cov ntsiab lus tseem ceeb ntawm cov roj hmab foob tsis ua haujlwm
Raws li ib tug dav siv sealing keeb nyob rau hauv industrial teb, kev ua tau zoo thiab lub neej ntawmroj hmab sealing ringsncaj qha cuam tshuam rau kev nyab xeeb thiab kev ntseeg siab ntawm cov cuab yeej siv tshuab. Txawm li cas los xij, hauv kev xyaum, cov roj hmab ntsaws ruaj ruaj feem ntau ua tsis tau rau ntau yam laj thawj, ua rau cov dej xau, kev ua haujlwm tsis zoo, thiab txawm tias cov khoom puas tsuaj. Cov hauv qab no yog ib qho kev ntsuam xyuas qhov tob ntawm qhov laj thawj tseem ceeb ntawm kev tsis ua haujlwm ntawm cov roj hmab ntsaws ruaj ruaj los ntawm ntau qhov kev pom xws li cov khoom siv, tsim, kev ua, kev siv, s, thiab ib puag ncig sab nraud.
Khoom siv vim li cas
Kev ua tau zoo ntawm cov roj hmab ntsaws ruaj ruaj yog nyob ntawm lub cev thiab tshuaj lom neeg cov khoom ntawm cov khoom thiab nws compatibility nrog rau nruab nrab ua hauj lwm. Yog tias cov khoom tsis raug xaiv kom raug, lub foob yuav ua tsis tiav vim muaj ntau yam tshuaj thiab cov khoom siv ua haujlwm.
Cov ntaub ntawv yog incompatible
Cov khoom siv roj hmab yuav tsum tau hloov mus rau qhov nruab nrab (xws li roj, dej, roj) thiab qhov chaw ua haujlwm (piv txwv li, kub, av noo, tshuaj lom neeg). Yog tias cov khoom raug xaiv tsis raug, cov teeb meem hauv qab no yuav tshwm sim:
o los yog yaj: Cov ntsaws ruaj ruaj tuaj yeem o thaum raug rau qee cov roj, cov kuab tshuaj, lossis tshuaj, ua rau muaj qhov hloov pauv lossis txo lub zog.
Hardening los yog softening: Tshuaj incompatibility yuav ua rau cov roj hmab harden (poob elasticity) los yog soften (poob structural zog).
Degradation los yog decomposition: Qee cov roj hmab decompose thaum raug kub los yog oxidation (xws li, roj hmab ntuj yog tawg nyob rau hauv qhov kev txiav txim ntawm ozone).
Kev laus ntawm cov khoom siv roj hmab
Nyob rau hauv kev siv ntev, kev ua tau zoo ntawm cov khoom siv roj hmab yuav deteriorate vim kev laus, uas yog feem ntau manifested li poob elasticity, nce hardness, thiab nto tawg. Cov laj thawj tseem ceeb ntawm kev laus muaj xws li:
Thermal aging: Thaum kub kub, molecular chains ntawm roj hmab undergo thermal oxidative degradation, ua rau poob ntawm txhua yam khoom.
Oxidative aging: Oxygen reacts nrog ob daim ntawv cog lus hauv roj hmab molecules, ua rau cov khoom tawg.
Ozone aging: Ozone ua rau tawg ntawm cov roj hmab nto, tshwj xeeb tshaj yog nyob rau hauv dynamic tej yam kev mob.
Kev laus ntawm ultraviolet: ultraviolet rays los ntawm lub hnub ci tuaj yeem ua rau cov roj hmab degradation.
Kev tsiv teb tsaws ntawm cov khoom siv ntxiv
Plasticizers, antioxidants, fillers, thiab lwm yam ntxiv rau cov roj hmab tuaj yeem txav mus rau saum npoo hauv qab kub thiab nruab nrab, yog li hloov cov khoom ntawm cov roj hmab, xws li tawv tawv, tawg, thiab lwm yam.
Tsim vim li cas
Cov qauv tsim muaj qhov cuam tshuam tseem ceeb ntawm kev tsis ua haujlwm ntawm cov roj hmab ntsaws ruaj ruaj, thiab cov qauv tsim tsis tsim nyog yuav ua rau muaj kev sib khi tsis txaus lossis txawm tias tsis ua haujlwm.
Kev tsim cov qauv sealing yog tsis tsim nyog
Compression ntau dhau: Cov roj hmab ntsaws ruaj ruaj ntau dhau tuaj yeem ua rau deformation mus tas li lossis tearing.
compression tsis txaus: Yog tias qhov compression me dhau lawm, lub foob tsis tuaj yeem tsim tau.
Kev ntxhov siab ntau: angular lossis unsmooth nto hauv qhov tsim tuaj yeem ua rau muaj kev ntxhov siab uas tuaj yeem ua rau cov ntsaws ruaj ruaj raug puas tsuaj.
Tolerance txuam cov teeb meem
Kev tsis sib haum xeeb ntawm cov roj hmab foob thiab cov mating yuav ua rau lub foob tsis haum zoo. Kev xoob dhau tuaj yeem ua rau xau, thiab nruj heev tuaj yeem ua rau muaj kev sib txhuam los yog rhuav tshem lub foob.
Qhov loj me me ntawm lub nplhaib sealing raug xaiv tsis raug
Yog hais tias tus ntoo khaub lig-sectional loj ntawm lub nplhaib sealing me me dhau, nws tsis tuaj yeem tiv taus siab; Yog tias nws loj dhau lawm, nws yuav ua rau muaj kev nyuaj ntawm kev sib dhos thiab kev sib txhuam ntawm kev ua haujlwm.
Tsis quav ntsej tej yam kev mob dynamic
Tsis ua tiav kev xav txog kev sib khi hauv cov lus tsa suab (xws li, reciprocating, rotating) hauv kev tsim qauv tuaj yeem ua rau muaj kev sib txhuam ntau dhau los yog tsis muaj kev hnav tsis txaus, uas tuaj yeem ua rau tsis ua haujlwm.
Kev ua thiab kev tsim khoom yog vim li cas
Cov txheej txheem teeb meem hauv cov txheej txheem tsim khoom sealing kuj tseem ceeb rau kev ua tsis tiav.
Cov teeb meem kev tsim khoom
Kev ua tau zoo ntawm cov roj hmab ntsaws ruaj ruaj nyob ntawm qhov kev faib ua feem ntawm txhua feem hauv cov khoom tsim. Kev tsim qauv tsis tsim nyog, xws li qhov tsis raug ntawm vulcanizer lossis muab tub lim, tuaj yeem ua rau kev ua haujlwm tsis zoo.
Cov txheej txheem vulcanization tsis raug
Tsis txaus vulcanization yuav ua rau cov roj hmab tsawg elastic, thiab ntau vulcanization yuav ua rau kom brittleness los yog accelerated aging.
Dimensional sib txawv
Tsis txaus machining raug yuav ua rau qhov loj ntawm lub nplhaib sealing tsis sib xws rau kev tsim, cuam tshuam rau kev ua haujlwm sealing.
Deg tsis xws luag
Cov teeb meem xws li porosity, tawg, thiab burrs ntawm qhov chaw ntawm cov roj hmab foob yuav ua rau txo qis kev ua tau zoo, thiab tseem ua rau muaj kev ntxhov siab ua rau ua tsis tiav thaum ntxov.
Yog vim li cas rau tej yam kev mob ntawm kev siv
Qhov tsis ua haujlwm ntawm cov roj hmab ntsaws ruaj ruaj hauv cov ntaub ntawv siv tau kuj tseem muaj feem cuam tshuam nrog cov kev siv.
Kub kub overrun
Cov khoom siv roj hmab muaj qhov kub thiab txias, dhau qhov uas lawv tuaj yeem ua rau poob qis hauv kev ua haujlwm:
Kev kub kub ib puag ncig: Qhov no ua rau thermal aging ntawm cov ntaub ntawv, txo elasticity, thiab nce hardness.
Ib puag ncig qis: Ua rau roj hmab embrittlement lossis vitrification, poob ntawm sealing nyhuv.
Siab dhau los yog hloov siab
Nyob rau hauv ib puag ncig kev kub siab, lub foob yuav raug extruded los yog deformed ua tsis tiav; Kev hloov pauv siab tuaj yeem ua rau qaug zog puas tsuaj.
Kev txav ceev thiab teeb meem kev sib txhuam
Dynamic seals tuaj yeem hnav, deteriorate, los yog ua tsis tiav thaum ntxov vim qhov sib txuam ntawm kev sib txhuam ntawm cov kub ceev los yog nquag txav.
Kev sib kis ntawm qhov nruab nrab ua haujlwm
Lub xub ntiag ntawm cov khoom los yog impurities nyob rau hauv qhov nruab nrab ua hauj lwm yuav ua rau puas los yog khawb rau saum npoo ntawm lub nplhaib sealing.
Sab nraud ib puag ncig yam
Sab nraud ib puag ncig kuj muaj kev cuam tshuam loj rau lub neej kev pabcuam thiab kev ua haujlwm ntawm cov roj hmab foob.
1. Tshuaj yaig
Cov tshuaj corrosive (piv txwv li, acids, alkalis, ntsev tov) tuaj yeem ua rau muaj kev cuam tshuam rau cov roj hmab foob, ua rau lawv decompose lossis degrade lawv cov khoom.
2. Kev puas tsuaj
Mechanical puas (xws li khawb, txiav) thaum lub sij hawm installation lossis txij nkawm tuaj yeem yog qhov pib ntawm qhov tsis ua haujlwm.
3. Cov pa phem
Kev sib kis los ntawm cov khoom sab nraud tuaj yeem ua rau hauv qhov chaw sib khi, ua rau khawb lossis puas.
4. Electrochemical kev sib cuam tshuam
Electrochemical cov tshuaj tiv thaiv nyob rau hauv ib puag ncig tshwj xeeb, xws li sealing daim ntaub ntawv nyob rau hauv conductive kua, yuav ua rau kom cov laus los yog puas ntawm roj hmab.