Face seal with angled and annular grooves

Details Face seal with angled and annular grooves Face seal with angled and annular grooves

F - Mech Eng,Light,Heat,Weapons

16

J

F16J 15/34 (2006.01)

Patent

CA 2170746

A non-contacting grooved face seal assembly (10) for a shaft rotating at a high pressure and high spend with a combination of two groove patterns on one of the two sealing faces (17, 18; 118) of mating sealing rings (16, 18; 119); one pattern being relatively deep angled grooves (34; 134), and the other pattern being a relatively shallow annular groove (44; 144). The relatively deep groove pattern is optimized for hydrodynamic operation and on shaft rotation pumps the sealed fluid between the sealing faces to set the running clearance. The relatively shallow pattern is designed to hydrostatically prevent a friction lock of the sealing faces at starting and stopping of shaft rotation by admitting controlled amount of sealed fluid between the sealing faces (17, 18; 118) when the shaft is at or near to a stationary condition.

Ensemble joint mécanique (10) rainuré sans contact destiné à un arbre tournant avec une forte pression et à grande vitesse, comprenant une combinaison de deux types de rainures sur une des deux faces d'étanchéité (17, 18; 118) de bagues d'étanchéité appariées (16, 19; 119); le premier type étant une rainure (34, 134) à angles relativement profonds et le deuxième type étant une rainure (44; 144) annulaire relativement peu profonde. On a optimisé le type de rainure relativement profonde pour qu'elle fonctionne hydrodynamiquement et pompe, lorsque l'arbre tourne, le fluide bloqué entre les faces d'étanchéité afin de définir le jeu fonctionnel. Le type de rainure relativement peu prodonde permet d'empêcher hydrostatiquement un blocage par frottement des faces d'étanchéité lorsque l'arbre commence à tourner ou cesse de tourner, étant donné que ce type de rainure relativement peu profonde laisse passer une quantité régulée de fluide bloqué entre les faces d'étanchéité (17, 18; 118) lorsque l'arbre est stationnaire ou sensiblement stationnaire.

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