Cooling device for cooling the slots of a turbomachine rotor disk downstream from the drive cone

1. A cooling device for cooling the slots of a rotor disk in a turbomachine, the device comprising:

an upstream rotor disk centered on a longitudinal axis of a turbomachine and including an annular ring that extends downstream from a downstream main face of the disk, said ring having a fastener flange extending radially inwards with a periphery thereof being festooned to have solid portions alternating with hollow portions;

a downstream rotor disk centered on the longitudinal axis of the turbomachine, having at a periphery thereof a plurality of axial slots that are outwardly open and that are designed to receive the roots of respective blades, and an annular ring that extends upstream from an upstream main face of the disk, said ring having a fastener flange that extends radially inwards;

an annular endplate for holding the blades of the downstream disk, the endplate being arranged around the ring of the downstream disk and co-operating therewith to form an annular space defining an air diffusion cavity, said endplate including a fastener flange extending radially inwards;

an annular cone for driving disks in rotation, the cone being centered on the longitudinal axis of the turbomachine and including a fastener flange extending radially outwards with a periphery thereof being festooned to have solid portions alternating with hollow portions, the solid portions being angularly aligned with the solid portions of the fastener flange of the ring of the upstream disk; and

a plurality of bolted connections passing from upstream to downstream successively through the solid portions of the fastener flange of the ring of the upstream disk, the solid portions of the fastener flange of the cone, the fastener flange of the endplate, and the fastener flange of the ring of the downstream disk,

wherein the fastener flange of the endplate is pierced by ventilation orifices opening out into the air diffusion cavity in order to feed the air diffusion cavity with cooling air, said air diffusion cavity opening out into the slots of the downstream disk via their upstream ends in order to cool the slots of the downstream disk, and

wherein the endplate further includes an annular ring extending upstream around the ring of the upstream disk and co-operating therewith to form an annular space communicating with the air diffusion cavity via ventilation orifices.

2. The device according to claim 1 , wherein the space formed between the respective rings of the endplate and of the upstream disk communicates with an air feed cavity via the hollow portions of the fastener flanges of the ring of the upstream disk and of the cone.

3. The device according to claim 1 , wherein the ring of the endplate is an interference fit on the ring of the upstream disk.

4. The device according to claim 1 , wherein the endplate further includes radial sealing wipers for co-operating with the inside annular surface of a nozzle located between the upstream and downstream disks.

5. A low-pressure turbine stage of a turbomachine including a cooling device according to claim 1 .

6. A turbomachine including a cooling device according to claim 1 .