Labyrinth seal abradable structure, notably for aircraft turbine
AssigneeSafran Aircraft Engines
InventorsBaptiste Marie Aubin Pierre JOUY, Mathieu Charles Jean VERDIERE
Life of this patent
Estimating the term…
Abstract
An abradable structure (36) is provided, with regions (44, 45, 46) with lower resistance to wearing produced by labyrinth seal lips (4, 5), at specific points in the axial direction of the turbomachine, where lip interference could cause the rotor to block up, such as after a temporary shutdown of the turbomachine. These regions may be produced by local weakening (38) or by the abradable material having a structure that is less dense. Application, for example, to turbomachine turbines.
Claims11
1-13. (canceled)
A labyrinth seal abradable structure (29, 36) disposed in a turbomachine around an axis (X) of the turbomachine, the labyrinth seal abradable structure comprising in an outer layer (55) provided with partitions (31, 32;
- 47;
- 64, 65) delimiting cells, at least three regions (33, 34, 35;
- 43, 44, 45, 46;
- 61, 62, 63) formed by annular bands of the abradable structure labyrinth seal which are juxtaposed to succeed one another in a direction of the axis (X) and have wear resistances of progressive values in the direction of the axis, wherein the cells are rectangular, the partitions in each of the regions are joined at junctions which connect only three cells together, and said partitions are oriented at an angle comprised between 30 and 60° relative to the direction of the axis (X).
A turbomachine turbine, comprising a labyrinth seal abradable structure disposed around an axis (X) of the turbomachine, said structure comprising, in an outer layer (55) provided with partitions (31, 32;
- 47;
- 64, 65) delimiting cells, at least three regions (33, 34, 35;
- 43, 44, 45, 46;
- 61, 62, 63) formed by annular bands of the abradable structure labyrinth seal which are juxtaposed to succeed one another in a direction of the axis (X) and have wear resistances of progressive values in the direction of the axis, wherein the cells are rectangular, the partitions in each of the regions are joined at junctions which connect only three cells together, and said partitions are oriented at an angle comprised between 30 and 60° relative to the direction of the axis (X).
Dependencies are inferred from the claim text.