| 摘要 |
The invention relates to a labyrinth disk 7 to be mounted on the upstream face of a turbine disk 3 of a turbomachine to create channels 80 for guiding ventilation air into the roots of the HP turbine blades 4. The labyrinth disk 7 comprises a hub 71, a web 72 and a frustoconical peripheral portion 73, having on its outer face labyrinth seal teeth 77 and on the other face radial ribs 78 the flanks 78f of which delimit, between one another, ventilation channels 80 which open out at the periphery of the disk 7, the width of said channels 80 decreasing from the base of the frustoconical portion 73 to the opening at the periphery. The ribs 78' are split close to the periphery by recesses 79 which create two ribs (78'1 and 78'2, fig.7) from one and the same rib 78'. The flanks (781f and 782f, fig.7) of the ribs 78'1 and 78'2) are radiused in shape. |
