{"id":1299,"date":"2012-12-07T11:56:59","date_gmt":"2012-12-07T11:56:59","guid":{"rendered":"https:\/\/fgti-distribution.fr\/?page_id=1299"},"modified":"2023-07-05T12:11:56","modified_gmt":"2023-07-05T12:11:56","slug":"ogolnosci","status":"publish","type":"page","link":"https:\/\/fgti-distribution.fr\/pl\/joints-detancheite\/generalites\/","title":{"rendered":"Funkcja uszczelki kompozytowej"},"content":{"rendered":"
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FGTI-Distribution > Uszczelnienia > Funkcja uszczelki kompozytowej<\/div>\n

\n\n\n\n\n\n\n\n\n\n
\nFunkcja uszczelki kompozytowej\n<\/td>\n<\/a>\n<\/td>\n<\/tr>\n\n
\nZasada budowy\n<\/td>\n\nUszczelki kompozytowe sk\u0142adaj\u0105 si\u0119 zazwyczaj z dw\u00f3ch element\u00f3w.
\nPier\u015bcie\u0144 uszczelniaj\u0105cy jest obrabiany z PTFE wype\u0142nionego, charakteryzuj\u0105cego si\u0119 szczeg\u00f3ln\u0105 odporno\u015bci\u0105 na zu\u017cycie. Dzi\u0119ki w\u0142a\u015bciwo\u015bciom tego materia\u0142u, uszczelnienia s\u0105 w stanie wytrzyma\u0107 ci\u015bnienie, pr\u0119dko\u015b\u0107 i znaczne wahania temperatury.
\n\n<\/td>\n		\nW zwi\u0105zku z tym, \u017ce warto\u015bci maksymalne osi\u0105ga si\u0119 jedynie poprzez dodanie r\u00f3\u017cnych parametr\u00f3w, w niekt\u00f3rych ekstremalnych zastosowaniach konieczne s\u0105 testy wst\u0119pne.
\nElement wst\u0119pnego spr\u0119\u017cenia spr\u0119\u017cystego zapewnia ci\u015bnienie niezb\u0119dne do zapewnienia szczelno\u015bci mi\u0119dzy powierzchni\u0105 ciern\u0105 a powierzchni\u0105 przeciwn\u0105, gwarantuj\u0105c w ten spos\u00f3b trwa\u0142o\u015b\u0107 uszczelnienia. Wst\u0119pne spr\u0119\u017cenie jest realizowane za pomoc\u0105 uszczelki O-ring z elastomeru lub profilowanej spr\u0119\u017cyny stalowej. Uszczelki O-ring zapewniaj\u0105 r\u00f3wnie\u017c szczelno\u015b\u0107 statyczn\u0105 w dnie rowka.
\nPrzy wyborze materia\u0142\u00f3w na pier\u015bcie\u0144 uszczelniaj\u0105cy i element dociskowy nale\u017cy uwzgl\u0119dni\u0107 warunki u\u017cytkowania.\n<\/td>\n<\/tr>\n\n
\nUszczelnienie wewn\u0119trzne\nlub zewn\u0119trzne\n<\/td>\n\nWszystkie uszczelki zapewniaj\u0105ce uszczelnienie promieniowe mog\u0105 by\u0107 zaprojektowane tak, aby zapewnia\u0142y uszczelnienie wewn\u0119trzne lub zewn\u0119trzne.
\nUszczelnienie zewn\u0119trzne, na przyk\u0142ad uszczelka t\u0142okowa MANOY\u00ae profil 112\n<\/td>\n		\n\nUszczelnienia wewn\u0119trzne, na przyk\u0142ad uszczelnienie trzpienia MANOY\u00ae profil 120\n<\/td>\n<\/tr>\n\n
\nDzia\u0142anie uszczelnienia<\/td>\n\nUszczelnienia kompozytowe i uszczelnienia wargowe MANOY s\u0105 aktywowane przez nacisk p\u0142ynu. Dzi\u0119ki spr\u0119\u017cysto\u015bci swojego przekroju w rowku, o-ring zapewnia statyczne uszczelnienie w rowku i popycha dynamiczne uszczelnienie na przeciwleg\u0142\u0105 powierzchni\u0119.\n<\/td>\n\n\nCi\u015bnienie p\u0142ynu wywiera dodatkowe napr\u0119\u017cenie wst\u0119pne na uszczelk\u0119 t\u0142oka.\nW ten spos\u00f3b ci\u015bnienie potrzebne do zapewnienia szczelno\u015bci r\u00f3wnowa\u017cy si\u0119 ci\u015bnieniem dostarczanym przez p\u0142yn.\nDo oko\u0142o 2 MPa si\u0142a uszczelniaj\u0105ca jest uzyskiwana niemal wy\u0142\u0105cznie dzi\u0119ki naciskowi elementu wst\u0119pnego napr\u0119\u017cenia. \n<\/td>\n<\/tr>\n\n
\nWyb\u00f3r profilu<\/td>\n\n\n<\/td>\n\nWyb\u00f3r profilu uszczelnienia zale\u017cy przede wszystkim od rodzaju ruchu, kierunku i warto\u015bci ci\u015bnienia, a tak\u017ce od jako\u015bci medium.\n<\/td>\n<\/tr>\n\n
\nNapr\u0119\u017cenie wst\u0119pne uszczelki typu O-ring<\/td>\n\nAby zapewni\u0107 dobre uszczelnienie, obudowy s\u0105 umieszczone w taki spos\u00f3b, aby na uszczelk\u0119 O-ring lub spr\u0119\u017cyn\u0119 wywierany by\u0142 \u015bredni wst\u0119pny nacisk.
\nMniejsza g\u0142\u0119boko\u015b\u0107 rowka zapewnia wi\u0119ksze si\u0142y docisku i tym samym poprawia szczelno\u015b\u0107 przy niskich (do ok. 2 MPa) lub zerowych ci\u015bnieniach.\nWi\u0119ksza g\u0142\u0119boko\u015b\u0107 rowka pozwala na pewn\u0105 elastyczno\u015b\u0107 pracy, kt\u00f3ra jednak odbywa si\u0119 kosztem szczelno\u015bci.\n<\/td>\n		\n\n<\/td>\n<\/tr>\n\n\n
\nWarto\u015b\u0107 gry operacyjnej<\/td>\n\nMinimalna wymagana warto\u015b\u0107 luzu zale\u017cy od dok\u0142adno\u015bci prowadnicy i innych parametr\u00f3w monta\u017cu. Nale\u017cy zatem uwzgl\u0119dni\u0107 mo\u017cliwe wzrosty ci\u015bnienia i rozszerzalno\u015b\u0107 ciepln\u0105.
\nPo przeciwnej stronie ni\u017c nacisk, nale\u017cy preferowa\u0107 s\u0142abe gry, podczas gdy po stronie nacisku, wysoka gra pozwala unikn\u0105\u0107 gromadzenia si\u0119 cz\u0105stek.
\nDla ci\u015bnie\u0144 powy\u017cej 40 MPA, przestrzeganie warto\u015bci tolerancji H8\/f8 dla \u015brednic cylindra\/t\u0142oka i tulei\/trzonk\u00f3w jest obowi\u0105zkowe.\n<\/td>\n		\n\n<\/td>\n<\/tr>\n\n
\nHydroizolacja<\/td>\n\nUszczelnienie mo\u017ce by\u0107 idealnie szczelne tylko wtedy, gdy jest statyczne. W ruchu szczelno\u015b\u0107 jest trudniejsza. Ca\u0142kowicie suche dzia\u0142anie prowadzi\u0142oby do zu\u017cycia wszystkich element\u00f3w uszczelniaj\u0105cych. W przypadku uszczelnie\u0144 dynamicznych, lekkie smarowanie przez medium na przeciwleg\u0142ej powierzchni zapewni prawid\u0142owe dzia\u0142anie uszczelnienia.\n<\/td>\n\n \n<\/td>\n<\/tr>\n\n<\/tbody><\/table>\n\n
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