Ukuziphendukela kwemvelo kwe-Seal Materials
Ukuvela kwezinto zokufaka uphawu kwavela njengoba izimvu zamanzi zibhekana nezidingo ezinzima.Izidingo zangaphambi kwesikhathi zingahlangatshezwa kusetshenziswa i-hemp epakishiwe noma isikhumba, kodwa njengoba izimfuno ziya ngokuya ziba namandla kakhulu kwafunwa izinto ezintsha.Lokhu kwaholela ekwethulweni kwezimpawu zenjoloba zemvelo, eziguquke zaba ama-elastomer okwenziwa, futhi ekugcineni ama-polymers wobunjiniyela njenge-PTFE (Polytetrafluoroethylene).
Izinketho ezine zesimanje ezijwayelekile zezindebe zophawu lwe-rotary shaft seal irabha ye-nitrile, i-polyacrylate, i-FKM, ne-PTFE.Kulezi zinto, ezintathu ama-elastomers - irabha ye-nitrile, irabha ye-polyacrylate ne-FKM - futhi eyodwa kuphela i-polymer - PTFE.Ake sibone ukuthi lezi zinsiza zinqwabelana kanjani.
Material 1: Nitrile Rubber
Irabha ye-Nitrile ihamba ngamagama ambalwa impela, okuhlanganisa irabha ye-acrylonitrile butadiene, i-Buna-N, ne-NBR.Ngokuyisisekelo i-elastomer yerabha yokwenziwa imelana kakhulu namanye amakhemikhali abalulekile njengamafutha, okothambisa, namafutha.Uma kuqhathaniswa namanye ama-elastomer, enza umsebenzi oncomekayo wokumelana nokuwohloka nokuchayeka elangeni nesimo sezulu.Nokho, inemingcele yayo.
Izinto 2: Irabha yePolyacrylate
I-Polyacrylate ibhekisela kurabha ye-polyacrylate futhi ngezinye izikhathi ibizwa ngokuthi i-ACM.Inikeza ukumelana nokushisa okungcono futhi ihambisana nesivinini esiphezulu se-shaft kunerabha ye-nitrile.Kuhle futhi kwezinye izinhlelo zokusebenza ezikhethekile ezifana nezithambisi ezihlanganisa isulfure.Amandla ayo alinganiselwe kanye nokumelana namanzi yizici zayo ezinkulu ezikhawulelayo.
Izinto 3: I-FKM (Fluoroelastomers)
Nali iqiniso elithakazelisayo: abantu bavame ukudideka mayelana nomehluko phakathi kwe-FKM, FPM, ne-Viton.Wonke abhekisele ezintweni eziyisisekelo ezifanayo.Igama elithi FKM lithola izimpande zalo ezinhlotsheni ze-ASTM ze-flooelastomers, kuyilapho i-FPM iyisifinyezo se-DIN/ISO.IViton igama layo lokuhweba, eliphethwe yiDuPont.Izakhiwo ze-FKM ziphakeme kakhulu kunaleyo yerabha ye-nitrile noma irabha ye-polyacrylate, kokubili ngokwezinga lokushisa nesivinini se-shaft, kodwa futhi ukumelana namakhemikhali.Futhi ibiza kakhulu kuma-elastomer amathathu okuxoxwe ngawo kuze kube manje.
Izinto 4: PTFE (Polytetrafluoroethylene)
I-PTFE yaziwa kakhulu ngegama layo lokuhweba, i-polymer (ephethwe yi-DuPont).I-PTFE idlula kude ukusebenza kwerabha ye-nitrile, irabha ye-polyacrylate, ne-FKM ngokwejubane le-shaft, izinga lokushisa, nokumelana namakhemikhali.Eqinisweni, i-is inokumelana okuhle kakhulu kwamakhemikhali kwanoma iyiphi i-polymer noma i-elastomer kanye ne-coefficient ephansi yokungqubuzana.
Isiphetho
Ishadi elingezansi libonisa ukuthi lezi zinto ezine ezivamile zokufaka uphawu zinqwabelana kanjani ngokuya ngemikhawulo yazo yesivinini se-shaft.I-PTFE idlula konke okunye, ngisho nangesivinini se-shaft esingaphezu kuka-30,000 rpm.Uma ukhetha uphawu oludinga ukusinda endaweni ebolayo neyinselele ngesivinini esiphezulu, ungabheki kude kune-PTFE.
Isikhathi sokuthumela: May-08-2018