Patent ID: 7972107

Claim:
A device for cooling a turbine casing in a turbomachine, comprising: a turbine including several stages, at least one of the stages including a nozzle assembly formed of an annular row of fixed vanes, radially extending between an internal wall of revolution and an external wall of revolution, borne by the casing of the turbine and an impeller mounted to rotate inside the casing in a cylindrical shroud formed of ring sectors fixed circumferentially to the casing, a cooling circuit which cools the vanes of the nozzle assembly of an upstream stage, the cooling circuit including ducts which carry cooling air into internal cavities formed in the vanes of the nozzle assembly, a first end of the duct being engaged in an orifice disposed in the casing of the turbine and a second end of the duct being engaged in an orifice disposed in the external wall of revolution, and an air-carrying arrangement which carries air to casing upstream hooks which suspend the ring sectors surrounding the impeller of the upstream stage, the air-carrying arrangement connecting the internal cavities of the vanes of the nozzle assembly of the upstream stage to the annular space in which the upstream hooks lie, wherein radially external ends of the internal cavities of the vanes are closed by plates attached to the nozzle assembly and wherein the air-carrying arrangement includes a first set of drillings disposed in the plates and a second set of drillings disposed in an external downstream annular rim provided on the external wall of revolution which extends radially between the radially external ends of the internal cavities and the upstream hooks for suspending the ring sectors.