Double gas seal with coplanar pad faces

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

Patent

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Details

F16J 15/34 (2006.01)

Patent

CA 2325475

A double gas pressure seal (10) is provided for sealing between a stationary housing (14) and a rotary housing (26). The gas pressure seal includes a stationary ring (42) and a rotary ring (40) each having a radially inner sealing face and a radially outer sealing face. A biasing spring (56) biases one of the rings toward the other ring. An annular groove (68) is provided in one of the rings, with the groove being spaced between the radially inner sealing faces and radially outer sealing faces. A supply port (84) supplies pressurised gas to the annular groove at a pressure higher than the process fluid in the stationary housing. A plurality of radially inner and radially outer recesses (94, 96) are provided on the one of the rings, and corresponding feed channels (98, 100) fluidly interconnect the annular groove with a rotary leading portion of each respective recess. A small quantity of pressurized gas escapes between the inner sealing faces to atmosphere and between the outer sealing faces to the process fluid sealed in the stationary housing.

L'invention concerne un joint d'étanchéité (10) double pour gaz sous pression, permettant d'assurer l'étanchéité entre un logement fixe (14) et un logement rotatif (26). Le joint d'étanchéité pour gaz comprend une bague fixe (42) et une bague rotative (40), chacune possédant une face d'étanchéité radiale interne et une face d'étanchéité radiale externe. Un ressort de sollicitation (56) pousse l'une des bagues vers l'autre. Une rainure annulaire (68) est située sur l'une des bagues, la rainure étant disposée espacée entre les faces d'étanchéité radiales internes et les faces d'étanchéité radiales externes. Un orifice d'alimentation (84) fournit du gaz sous pression à la rainure annulaire, à une pression supérieure à celle du fluide de traitement dans le logement fixe. Une pluralité d'évidements (94, 96) radialement internes et externes sont fournis sur l'une des bagues, et des canaux d'alimentation (98, 100) correspondants relient fluidiquement la rainure annulaire et une partie avant rotative de chaque évidement respectif. Une petite quantité de gaz sous pression s'échappe entre les faces d'étanchéité internes, dans l'atmosphère, et entre les faces d'étanchéité externes, vers le fluide de traitement enfermé de manière étanche dans le logement fixe.

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