Sealing system

Details Sealing system Sealing system

F - Mech Eng,Light,Heat,Weapons

04

D

F04D 29/08 (2006.01) F04D 29/10 (2006.01) F16J 15/34 (2006.01) F16J 15/40 (2006.01)

Patent

CA 2459550

A sealing system (1) to prevent loss of a process fluid from a device (2) having a device opening (3) and a rotating member (4) operable for rotational movement within the device opening (3). A rotary shaft seal (10) seals the rotating member (4) to inhibit leakage of process fluid. A chamber (12) is connected to the device (2) to recover leakage of the process fluid that leaks from the rotary shaft seal (10). A barrier seal (20) is connected to the chamber (12) to inject a barrier fluid under pressure to prevent the escape of process fluid from the chamber (12). The chamber (12) discharges a mixture of barrier and process fluid to a filter (26), such as a coalescing filter, to separate the barrier fluid from the process fluid. Barrier fluid vapor (28) and water vapor traps (30) can also be used for purification purposes. The barrier fluid is recovered and recycled back to the barrier seal (20). The process fluid is returned to the device (2).

L'invention concerne un système d'étanchéité (1) qui empêche la fuite du liquide de traitement d'un dispositif (2) pourvu d'une ouverture (3) et d'un élément tournant (4) effectuant un mouvement rotatif dans l'ouverture du dispositif (3). Un joint d'arbre tournant (10) assure l'étanchéité de l'élément tournant (4) pour empêcher la fuite du liquide de traitement. Une chambre (12) reliée au dispositif (2) recueille le liquide de traitement qui fuit du joint d'arbre tournant (10). Un joint barrière (20) relié à la chambre (12) permet d'injecter un liquide barrière sous pression pour empêcher la fuite du liquide de traitement de la chambre (12). Cette chambre (12) libère un mélange de liquide barrière et de liquide de traitement dans un filtre (26), notamment un filtre coalescent, pour les séparer l'un de l'autre. Par ailleurs, on peut utiliser les pièges (28) de la vapeur de liquide barrière (28) et ceux (30) de la vapeur d'eau dans des procédés de purification. Le liquide barrière est récupéré et réinjecté dans le joint barrière (20). Le liquide de traitement est retourné vers le dispositif (2).

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