Method of making labyrinth seal lips for the moving parts of turbomachines
a technology of turbomachines and sealing lips, which is applied in the direction of machines/engines, sustainable transportation, mechanical equipment, etc., can solve the problems of cracks being started, high shrinkage, and destruction of moving parts
Inactive Publication Date: 2004-11-11
SNECMA MOTEURS SA
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- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Benefits of technology
[0007] An object of the invention is to provide a method of making labyrinth seal lips at the periphery of a metal moving part of a turbomachine, and particularly but not exclusively a part made essentially of titanium or titanium alloy, which method avoids the above-mentioned drawbacks of the prior art, in particular by making it possible to avoid any risk of contact and consequent eutectic formation between the metal material of the moving part and any abradable material carried by an adjacent stationary part, and to make this possible regardless of the shape and the location of the lips.
Problems solved by technology
High energy contacts between materials containing titanium and materials containing nickel, for example, lead to fragile eutectics being formed having low melting points and presenting a high degree of shrinkage on solidifying, which can lead to cracks being started.
On propagating, such cracks can become transformed into fatigue cracks in the metal that can in turn lead to destruction of the moving parts.
Unfortunately, the shape of the labyrinth seal lips 2 and their offset location between the moving blades 3 at a distance from the welding connection plane 4, makes it very difficult or even practically impossible to achieve a completely satisfactory coating on both flanks of the lips, i.e. a coating that guarantees there will be no contact between the titanium of the material constituting the rotor 1 and the abradable material 5 fitted to the tips of the stationary vanes 6 facing the lips 2.
Method used
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[0019] FIG. 2A shows a portion of a turbomachine rotor 10, in particular of a rotor of a gas turbine engine for aircraft. By way of example, it comprises a portion of rotor section prior to being welded to one or more other sections to build up a welded rotor such as the rotor 1 of FIG. 1. The rotor portion 10 is designed to be placed facing the tips of stationary vanes provided with an abradable coating in the high-pressure compressor section of the turbomachine.
[0020] The rotor 10 is made of metal, for example essentially of titanium or titanium alloy.
[0021] As shown in FIG. 2B, a thick layer 12 of refractory material is formed on the rotor portion 10.
[0022] The layer 12 is made of a material which is both compatible with the metal of the rotor 10 and is suitable for making lips, e.g. labyrinth seal lips suitable for coming into contact with an abradable material carried by the tips of stationary vanes situated facing the rotor portion 10 after assembly.
[0023] The refractory mater...
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Abstract
In order to make labyrinth seal lips on the periphery of a metal moving part of a turbomachine, a thick layer of refractory material that adheres to the metal is made prior to assembling the moving part, the refractory material advantageously comprising at least one metal selected for example from Fe, Co, and Ni, together with at least one ceramic selected for example from borides, nitrides, carbides, and refractory oxides. The labyrinth seal lips that are to be made are machined to their final dimensions in the deposited thick layer.
Description
[0001] The invention relates to making labyrinth seal lips for the moving (rotary) parts of turbomachines, in particular for the rotors of gas turbine engines for aircraft.[0002] In such gas turbines, the clearance between the radial ends of the moving parts and the facing stationary parts must be as small as possible in order to avoid lowering efficiency. This applies both between the tips and of the moving blades and a stationary ring surrounding them, and also between the periphery of a rotor and the tips of the stationary vanes situated around the rotor. In order to prevent gas flowing directly between the tips of the stationary vanes and the rotor, it is also known to form projecting annular portions on the periphery of the rotor that are referred to as "lips", at least some of which can define a tortuous path or labyrinth.[0003] The small size of the clearance between the stationary parts and the moving parts, and also the variations in dimensions due to temperature changes, m...
Claims
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IPC IPC(8): F01D11/00F01D11/02
CPCF01D11/001F01D11/02F05C2201/0463F05C2201/0466Y02T50/671F05D2230/10F05D2300/21F05D2300/502Y02T50/67Y02T50/60
InventorGUELDRY, GERARDMONS, CLAUDE
OwnerSNECMA MOTEURS SA