Evolution of Materials Seal
Ukuvela kwemathiriyeli yetywina kuye kwavela njengoko amatywina ayejongene neemfuno ezirhabaxa.Iimfuno zakwangoko zinokuhlangatyezwa kusetyenziswa ihemp epakishiweyo okanye ngesikhumba, kodwa njengoko iimfuno zazisiya zisiba ngqongqo ngakumbi kwaye kwafunwa izixhobo ezitsha.Oku kwakhokelela ekufakweni kwezitywina zerubha zendalo, eziye zavela kwi-elastomers zokwenziwa, kwaye ekugqibeleni iipolymers zobunjineli ezifana ne-PTFE (Polytetrafluoroethylene).
Ezine zezona ziqhelekileyo iinketho zemathiriyeli zangoku ze-rotary shaft seal lips yirabha ye-nitrile, i-polyacrylate, i-FKM, kunye ne-PTFE.Kwezi zixhobo, ezintathu zi-elastomers - irabha ye-nitrile, irabha ye-polyacrylate kunye ne-FKM - kwaye inye kuphela i-polymer - PTFE.Makhe sibone ukuba ezi mathiriyeli ziqokelelana njani.
Izinto 1: Irabha yeNitrile
Irabha ye-Nitrile ihamba ngamagama ambalwa, kuquka irabha ye-acrylonitrile butadiene, iBuna-N, kunye ne-NBR.Ngokusisiseko yirabha yokwenziwa elastomer ekwaziyo ukumelana neekhemikhali ezithile eziphambili njengeoyile, izithambiso, kunye namafutha.Xa kuthelekiswa nezinye ii-elastomers, yenza umsebenzi obalaseleyo wokuxhathisa ukuthotywa kunye nokuchanabeka elangeni nakwimozulu.Inayo imida, nangona kunjalo.
Izinto eziphathekayo 2: Irabha yePolyacrylate
I-Polyacrylate ibhekisela kwirabha ye-polyacrylate kwaye ngamanye amaxesha ibizwa ngokuba yi-ACM.Inika ukumelana nobushushu obungcono kwaye iyahambelana nezantya eziphezulu zeshaft kunerubha ye-nitrile.Ikwalungile kakhulu kwezinye izicelo ezizodwa ezifana nezithambiso ezibandakanya isulfure.Amandla ayo alinganiselweyo kunye nokuchasana kwamanzi ziimpawu zayo eziphambili zokunciphisa.
IMaterial 3: FKM (Fluoroelastomers)
Nantsi inyani enomdla: abantu bahlala bebhideka malunga nomahluko phakathi kwe-FKM, FPM, kunye neViton.Zonke zibhekisa kwizinto ezifanayo ezisisiseko.Igama elithi FKM lifumana iingcambu zalo kuhlelo lwe-ASTM lweflooelastomers, ngelixa i-FPM iyisishunqulelo se-DIN/ISO.IViton ligama layo lokurhweba, eliphethwe yiDuPont.Iipropathi ze-FKM zingaphezulu lee kunezo zerabha ye-nitrile okanye irabha ye-polyacrylate, zombini ngokumalunga nobushushu kunye nesantya se-shaft, kodwa kunye nokuxhathisa imichiza.Ikwayeyona ibiza kakhulu kwii-elastomers ezintathu ekuxoxwe ngazo ukuza kuthi ga ngoku.
IMaterial 4: PTFE (Polytetrafluoroethylene)
I-PTFE yaziwa kakhulu ngegama layo lezorhwebo, i-polymer (ekwayeye-DuPont).I-PTFE igqithise kakhulu ukusebenza kwerabha ye-nitrile, irabha yepolyacrylate, kunye ne-FKM ngokwesantya seshaft, ubushushu, kunye nokumelana neekhemikhali.Ngapha koko, ineyona khemikhali ixhathisayo kuyo nayiphi na i-polymer okanye i-elastomer kunye neyona coefficient isezantsi yokukhuhlana.
Ukuqukumbela
Itshathi engezantsi ibonisa indlela ezi zixhobo zine zokutywina eziqhelekileyo ezihlangana ngayo enye kwenye ngokwemiqathango yokunciphisa isantya seshaft.I-PTFE yodlula zonke ezinye, nakwizantya zeshaft ezingaphezulu kwe-30,000 rpm.Xa ukhetha itywina elifuna ukuphila kwindawo engcolisayo kunye nomngeni kwizantya eziphakamileyo, ungajongi ngaphaya kwe-PTFE.
Ixesha lokuposa: May-08-2018