Rotor wheel for a turbine engine
View Patent ↗A rotor wheel for a turbine engine, such as an airplane turboprop or turbojet, the rotor wheel including a rotor disk including teeth at its outer periphery defining slots for axially mounting and radially retaining blade roots. An annular lip includes an annular rim extending axially downstream from and radially towards an inside of a radial retaining mechanism formed to project axially from an upstream face of the disk, and a sealing mechanism is arranged radially inside the annular lip and upstream ends of platforms of the blades.
1. A rotor wheel for a turbine engine, or an airplane turboprop, or a turbojet, the rotor wheel comprising:
a rotor disk including teeth at an outer periphery thereof defining slots for axially mounting and radially retaining roots of blades, the blades including platforms arranged circumferentially end to end to define an annular flow passage for an air stream;
an annular lip extending substantially axially upstream fitted on an upstream face of the disk to limit air passing out from the annular passage; and
a sealing ring provided between the annular lip and upstream ends of the platforms of the blades,
wherein tabs are formed at upstream and radially outer ends of the teeth of the rotor disk, the tabs projecting axially upstream from the upstream face of the rotor disk,
wherein the annular lip includes an annular rim with a first cylindrical wall and a radial annular wall extending from a downstream end of the first cylindrical wall, a frustoconical wall which cooperates with the first cylindrical wall to define an annular groove that opens downstream, and a second cylindrical wall extending upstream from the frustoconical wall and radially located between the first cylindrical wall and a free downstream end of the frustoconical wall,
wherein each tooth of the rotor disk includes a lug provided at a base of the respective tooth and facing a radially inner end of the radial annular wall of the annular rim of the annular lip,
wherein the annular lip is housed between the tabs and the lugs of the rotor disk, and
wherein the sealing ring is arranged radially inside the frustoconical wall of the annular lip and the upstream ends of the platforms of the blades.
2. A rotor wheel according to claim 1 , wherein the frustoconical wall radially increases along a downstream direction.
3. A rotor wheel according to claim 2 , wherein the sealing ring is an O-ring configured to move radially outwards under centrifugal effect during rotation of the rotor wheel and for pressing against the frustoconical wall and against the upstream ends of the platforms of the blades.
4. A rotor wheel according to claim, wherein the O-ring is of substantially triangular section and includes a frustoconical face for coming into contact with the frustoconical wall of the annular lip and a substantially radial face for pressing axially against radial faces of the upstream ends of the platforms of the blades.
5. A rotor wheel according to claim 1 , wherein the annular lip is clamped axially against the rotor disk by an upstream cheek plate fastened to the rotor disk.
6. A rotor wheel according to claim 1 , wherein the blades are made of ceramic matrix composite material.
7. A turbine engine, an airplane turboprop, or a turbojet, comprising at least one rotor wheel according to claim 1 .
8. A rotor wheel according to claim 1 , wherein the radial annular wall of the annular rim of the annular lip includes an anti-rotation finger projecting radially inward which is received circumferentially between two adjacent lugs.