DOUBLE BAGUE D'ETANCHEITE A GLISSEMENT

BAGUE D'ETANCHEITE A GLISSEMENT, EN PARTICULIER POUR MACHINES HYDRAULIQUES, DANS LESQUELLES LA PRESSION APPLIQUEE EST UNE PRESSION ELASTIQUE DE RESSORT.BAGUE CARACTERISEE PAR AU MOINS UNE BAGUE D'ETANCHEITE A GLISSEMENT 10 POURVUE D'AU MOINS UN ORGANE 15, 16, 13 FERME, A ELASTICITE DE RESSORT, LEQUEL EST COMMANDE EN DEPENDANCE DE LA ROTATION DE LA MACHINE ET DE LA PRESSION APPLIQUEE SUR LA BAGUE, CET ORGANE DEPLACANT AXIALEMENT LA BAGUE PAR RAPPORT A L'AXE 1 DE LA MACHINE.BAGUE APPLICABLE A DES MACHINES HYDRAULIQUES TELLES QUE POMPES ET TURBINES. A double slide ring seal for hydraulic rotary machines such as pumps and turbines, in which the sealing pressure is generated by spring pressure is characterised by at least one sealing slide ring (10) and at least one resilient closed chamber (17) formed by bellows (15, 16) the pressure in the chamber (17) being controlled to open the seal (10, 11) in accordance with the rotary movement of the machine to be sealed and the pressure acting against the slide ring seal. The closed chamber (17) is located so as axially to displace annular element (12) relative to a shaft (1). The annular element 12 carries a further slide ring 14. The annular element (12) is connected to the slide ring (10) via a bellows (13). The annular element may carry the slide ring (10) (Fig. 2). A labyrinth seal (22) and a pressurized gas seal may be provided downstream of the double slide ring seal.