Nakuba irabha ye-nitrile butadiene (NBR) bekuyimpahla yotywino ye-turbine yomoya ehamba phambili amashumi eminyaka, ukuthuthuka ekubunjweni kophawu lwe-polyurethane, ukucubungula kanye nomklamo kusiqeda ngokushesha isikhundla se-NBR embonini.Kuvela ukuthi izakhiwo eziwusizo kakhulu zihlanganisa ukumelana nokugqoka, ukuhambisana noketshezi, ukumelana ne-ozone, amandla omshini, kanye nekhono lokugcina zonke lezi zakhiwo emazingeni okushisa aphansi.
I-polyurethane isiphenduke into ekahle yokuvala ama-bearing/amajeneretha amakhulu, ama-longitudinal nama-transverse bearings.Nokho, ukumane ushintshe izinto esakhiweni esikhona ngokuvamile akwanele.Izindwangu kufanele zenziwe nge-polyurethane engqondweni.
Enye indlela yokuhlola ukumelana nokugqokwa kwe-polyurethanes iwukuhlolwa okujwayelekile kokugqoka isigubhu okufana ne-ASTM D5963.Le ndlela ijwayele ukusetshenziselwa ukuhlola irabha, kodwa futhi iyasebenza ku-polyurethane, ikakhulukazi uma kuqhathaniswa amazinga okugqoka.Ngezansi kunamanani ezinkomba zokugqoka zezinto ezahlukahlukene ezihlolwe yiSistimu Seals eCleveland.Qaphela ukuthi i-NBR ne-HNBR zine-ARI engaba ngu-1.5, kuyilapho i-polyurethanes ine-ARI ka-4 kuya ku-8. Lokhu ukuthuthukiswa okufika izikhathi eziyisithupha.
I-polyurethane igcina amanani ayo e-ARI ngokuhamba kwesikhathi nangemva kokuchayeka oketshezini oluhlukahlukene, ikakhulukazi uketshezi olususelwa kuwoyela.Enye indlela yokunquma lokhu ukuguga amasampula okugqoka e-ASTM D5963 oketshezini oluku-100°C izinsuku ezingu-90 (80°C oketshezi olusekelwe emanzini) bese uphinda ukuhlolwa njalo ezinsukwini ezingu-30.Ngezansi kunemiphumela ejwayelekile, kodwa ukuqinisekiswa kuyanconywa kuketshezi ngalunye.
Umfanekiso 3. Ukugcinwa kwe-ARI ku-NBR kanye ne-hydrolysis-resistant polyurethane ngemva kokuguga emafutheni amaminerali ancibilikisiwe ku-100 ° C.
Nakuba ukucaciswa kubonisa ukuhambisana noketshezi oluqediwe, ukuhlola ukuguga okusheshisiwe (noma iminyaka yesevisi) kufanele kunqume ukusebenza kwesikhathi eside nokuzinza kwezinto ezivezwe oketshezini oluthile.I-System Seals ihlola ukuhambisana koketshezi izinsuku ezingu-90 kunokuhlola okujwayelekile kwamahora angu-168 ngoba ama-System Seals athola ngokuqhubekayo izinguquko ezibalulekile ezimpahleni ezibalulekile ngemva kwamahora angu-168 okuchayeka koketshezi.
I-polyurethane eyenziwe ngokwezifiso ibonisa ukumelana noketshezi okuthuthukisiwe uma kuqhathaniswa ne-NBR kuzinto zokugcoba ezivame kakhulu embonini yamandla omoya.Ngezansi kunethebula lokusebenzisana lalezi zinto zokugcoba ezidumile.
I-NBR yaziwa ngokungenwa kalula yi-ozonolysis, okuyilapho ama-molecule e-ozone ephula izibopho zamakhemikhali ku-NBR engagcwalisiwe.Ukuqhekeka kwe-ozone kuvamile lapho irabha ye-nitrile butadiene (NBR) ingaphansi kokonakala ngisho nokuncane.Isixazululo esisodwa ukujova i-wax ku-NBR, udale umgoqo we-anti-ozone ovikela i-NBR.Ngeshwa, i-wax ayishintshi isibopho samakhemikhali se-NBR.Uma i-NBR ibhekene nezimo zemvelo ezisusa i-wax, iba sengozini yokonakala futhi.Amanye ama-polyurethanes akhethekile asetshenziswa ezintini zamandla omoya ngokwemvelo amelana ne-ozone.
I-elastic modulus, amandla kanye nokwelulwa kwe-polyurethane ephakeme ngokuphindwe kabili kuya kwezintathu kuneningi le-NBR.Ngenxa yalokho, izimpawu ze-polyurethane ziyakwazi ukumelana nokukhubazeka okukhulu kwemishini futhi zimelane nemithwalo ephakeme yemishini.
I-NBR ejwayelekile ine-elastic modulus engu-10-15 MPa namandla aqinile angama-20 MPa.Ama-polyurethanes amaningi ane-elastic modulus engu-45-60 MPa namandla aqinile angama-50-60 MPa.Lokhu kusho ukuthi okokusebenza kuqinile kune-NBR, okusho ukugcinwa komumo okungcono kanye nokumelana okukhulu nemithwalo yengcindezi.
Kuma-turbines omoya, izinga lokushisa eliphezulu ngokuvamile aliyona inkinga.Kodwa-ke, kuye ngendawo nokuphakama, izinga lokushisa elincane elingu-40°C alivamile.I-NBR evamile inezinga lokushisa elincane lokusebenza elingu--20°C, futhi ukuhlaziya okuguquguqukayo kwemishini kubonise ukuthi ama-polyurethanes amaningi omoya awathintwa amazinga okushisa afika ku--40°C.
I-polyurethane iyisinqumo esingokwemvelo sezimpawu zamandla omoya ngenxa yezakhiwo zayo eziphakeme zemishini, ukumelana ne-ozone okungcono, amazinga okugqoka aphansi kanye namazinga okushisa aphansi okusebenza.Ngezansi kunemindeni emibili yezicelo lapho i-polyurethane ifaneleka kahle.Isithombe esingakwesokunxele sibonisa ukuwohloka okulingisiwe nezici zokuxhumana ze-polyurethane eveza uphawu.Isithombe esingakwesokudla sibonisa i-System Seals swirl seal, i-bearing seal eyinhloko empompa ngokuqhubekayo okokugcoba kubuyele endaweni yokugcina amanzi njengoba ibheretha izungeza.
Uma ungathanda ukufaka isandla ku-Windpower, sicela usithinte: https://www.bdseals.com noma www.bodiseals.com.I-NINGBO BODI SEALS CO., LTD ikhiqiza zonke izinhlobo zophawu lwenjoloba olusezingeni eliphezulu,ama-orings ,Ama-Gaskets .
Isikhathi sokuthumela: Dec-24-2023