Spindle seal with tangential flow-inducing distribution ring

F - Mech Eng,Light,Heat,Weapons – 16 – J

Patent

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Details

F16J 15/34 (2006.01) F16C 33/76 (2006.01)

Patent

CA 2735936

An improved cartridge-type bearing seal[10] includes removably connected stator and rotor sections [12, 14]. The stator section [12] supports a distribution ring [15] that divides an internal annular volume [36] into radially outside [36a] and inside portions [36b]. The ring [15] has a sufficient number of tangentially oriented ducts [17] to permit fluid communication between the outside [36a] and inside [36b] portions. With this structure, when pressurized purge fluid is supplied to the outside portion [36a], the fluid flows through the ducts [17], to induce a desired tangential fluid flow within the inside portion [36b]. This in turn causes circumferentially uniform fluid pressure in the annular volume [36] that resides between the rotating shaft [18] and the end cap [32] of the bearing housing, and the pressurized fluid traverses a flow path out of the bearing. This circumferentially uniform fluid pressure, by itself or in combination with a flexible lip [44], prevents contaminant ingress between the rotating shaft [18] and the end cap [32] of the bearing housing. Because the structure [15, 17] that creates the tangential fluid flow is part of the removable cartridge [12, 14], this bearing seal eliminates the need to machine or drill a tangentially oriented passage in the bearing housing. One embodiment adds a secondary ring [51] adjacent the distribution ring [15], to reduce the need to precision machine the inside dimension of the bearing cap. These structural components render the circumferential purge fluid feature even more readily available, for a wider range of spindles.

Un joint de palier amélioré de type à cartouche (10) comprend des sections de stator et de rotor raccordées de manière amovible (12, 14). La section de stator (12) supporte un anneau de distribution (15) qui divise un volume annulaire interne [36] en des parties radialement extérieures (36a) et intérieures (37b). Lanneau (15) a un nombre suffisant de conduits orientés tangentiellement (17) pour permettre une communication fluidique entre les parties extérieures (36a) et intérieures [36b]. Avec cette structure, quand un fluide de purge pressurisé est fourni à la partie extérieure [36a), le fluide sécoule à travers les conduits (17) pour induire un flux de fluide tangentiel souhaité dans la partie interne (36b). Cela provoque à son tour une pression de fluide uniforme de manière circonférentielle dans le volume annulaire [36] qui réside entre larbre rotatif (18) et le capuchon dextrémité (32) du logement de palier, et le fluide pressurisé traverse un chemin découlement hors du palier. Cette pression de fluide uniforme de manière circonférentielle, en soi ou en combinaison avec un rebord flexible (44), empêche lentrée de contaminant entre larbre rotatif (18) et le capuchon dextrémité (32) du logement de palier. Parce que la structure [15, 17] qui crée lécoulement de fluide tangentiel fait partie de la cartouche amovible (12, 14), ce joint de palier élimine la nécessité dusiner ou de percer un passage orienté tangentiellement dans le logement de palier. Un mode de réalisation ajoute un anneau secondaire (51) adjacent à lanneau de distribution (15), pour réduire la nécessité dusiner avec précision la dimension intérieure du capuchon de palier. Ces composants structurels rendent la caractéristique de fluide de purge circonférentiel encore plus facilement disponible, pour une gamme plus vaste d'arbres.

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