Shaft seals for sealing pulverulent solids

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

Patent

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Details

F16J 15/447 (2006.01) F16J 15/00 (2006.01)

Patent

CA 2378966

Contactless sealing between low speed, (5-1500 rpm), rotary shaft (302) and wall (304) is achieved in dusty environments by enabling build-up of powdery material on facing surfaces of seal (300). Labyrinthine annular passage (L, shown with exaggerated clearances) between shaft (302) and wall (304) has minimum initial clearance of not less than 0.4 mm, however entrained powder entering passage (L) deposits in layers on facing surfaces thereof to reduce cross-section of passage (L) and fluid flow therethrough. L-section setting rings may be inserted in passage (L) at assembly to maintain correct clearances. They will deteriorate rapidly during running-in of seal (300) but may contribute to build-up of powder layers.

Selon l'invention, pour obtenir un scellement sans contact entre un arbre rotatif (302) à faible vitesse (5-1500 tr/min) et une paroi (304) dans un milieu poussiéreux, on laisse s'accumuler de la matière poudreuse sur les surfaces frontales du joint (300). Le passage annulaire labyrinthique (L, illustré avec des détours exagérés) reliant l'arbre (302) à la paroi (304) présente un détour initial minimum qui n'est pas inférieur à 0,4 mm. La poudre entraînée pénétrant dans le passage (L) se dépose en couches sur des surfaces frontales du passage (L) qui réduisent la section transversale du passage (L) et l'écoulement fluidique à travers ce passage (L). Pendant l'assemblage, on peut insérer des bagues de réglage de section L dans le passage (L) afin de maintenir les détours appropriés. Même si ces derniers se détérioreront rapidement pendant le rodage du joint (300), ils peuvent contribuer à l'accumulation de couches poudreuses.

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