Hydrodynamically lubricated rotary shaft seal with...

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

Patent

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Details

F16J 15/54 (2006.01) F16J 15/32 (2006.01)

Patent

CA 2238084

The present invention is a hydrodynamically lubricated interference type rotary shaft seal suitable for environmental exclusion and high pressure lubricant retention which incorporates an environment-side groove to control and minimize interfacial contact pressure at the dynamic sealing interface, which permits optimum hydrodynamic film thickness, thereby significantly lowering the self generated heat produced by the seal, as compared to the prior art. The cool-running nature of the present invention permits the use of higher modulus seal materials and higher surface speeds, compared to the prior art, and allows the seal to operate in applications with relatively poor heat dissipation. The controlled interfacial contact pressure of the present invention also permits effective hydrodynamic lubrication with lower viscosity lubricants, including water.

La présente invention se rapporte à une garniture d'étanchéité (235) pour arbre rotatif de type interférentiel, à lubrification hydrodynamique, destinée à assurer l'isolement vis à vis des contaminants de l'environnement ainsi que la rétention d'un lubrifiant sous haute pression. Ladite garniture d'étanchéité (235) incorpore une rainure (200) exposée à l'environnement, conçue pour réguler et minimiser la pression de contact interfaciale au niveau de la surface d'étanchéité dynamique, ce qui permet d'optimiser l'épaisseur du film hydrodynamique, et par conséquent de réduire considérablement la chaleur autogène produite par ladite garniture (235). Le fonctionnement à froid rendu possible par cette invention permet d'une part d'utiliser des matériaux à module d'élasticité très élevé et d'autre part d'obtenir des vitesses périphériques relativement élevées. Cette garniture d'étanchéité peut par conséquent être utilisée dans des applications provoquant une dissipation de chaleur relativement faible.

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