Patent ID: 7556474
Filing Date: 2009-07-07
Classification: F01D,F05D,Y02T

Abstract:
1. A turbomachine including a blade wheel having blades that are hollow and cooled internally by a forced flow of cooling air, each blade being mounted in the periphery of a rotor disk, the blade wheel including a labyrinth-disk associated with said rotor disk in order to define a cooling air supply circuit communicating with air-flow cavities defined in said blades and opening out in the tips of blade roots connected to said rotary disk, said labyrinth-disk having radially-extending stiffening ribs wherein air is channeled between the ribs toward said blade roots, wherein a hook-annulus is interposed between the outer edge of said labyrinth-disk and said rotor disk, said hook-annulus being a distinct part from said labyrinth-disk, wherein said hook-annulus extends between an outer circumferential edge and an inner circumferential edge, said outer circumferential edge defining on an upstream side a retaining shoulder constituting an outer annular hook in which the outer edge of said labyrinth-disk is engaged, said outer circumferential edge further defining on a downstream side a surface that bears against said rotor disk, and said inner circumferential edge defining a bearing shoulder constituting an inner annular hook that is engaged in an axial groove around the circumference of said rotor disk, wherein said hook-annulus includes air flow passages so that air can flow towards the blade roots.