Assembly and method for the mounting of the foot of a blade of a turbine, blower, compressor, and turbine comprising such an assembly

Abstract

The invention relates to an assembly for the mounting of the foot ( 121 ) of a blade, fixed or movable, of a turbomachine, made of metal, in the aperture ( 101 ) of a support made of metal, such as a casing, a fixed flange or the disk ( 10 ) of a rotor. Characteristically, this assembly comprises, between the foot ( 121 ) and the aperture ( 101 ), a non-metallic film ( 20 ), coated or impregnated with an adhesive, in particular a fabric of glass fibres and/or polyamide fibres, advantageously comprising polytetrafluoroethylene. Application for the mounting of blades ( 12 ) of the fan on the disk ( 10 ) of the rotor, or for the fixed and/or movable blades of a compressor, in particular a low-pressure compressor.

1 . Assembly for the mounting of the foot ( 121 ) of a blade ( 12 ), fixed or movable, of a turbomachine, made of metal, in the aperture ( 101 ) of a support made of metal, characterised in that it comprises, between the foot ( 121 ) and the aperture ( 101 ), at least one non-metallic film ( 20 ) comprising polyamide, coated or impregnated with a polymer adhesive.  
   
   
       2 . Assembly according to the preceding claim, characterised in that the film ( 20 ) further comprises fibre glass and/or polytetrafluoroethylene.  
   
   
       3 . Assembly according to  claim 1  or  2 , characterised in that the film ( 20 ) comprises a fabric made of synthetic fibres.  
   
   
       4 . Assembly according to any one of the preceding claims, characterised in that the adhesive is thermo-polymerisable.  
   
   
       5 . Assembly according to  claim 4 , characterised in that the adhesive comprises a phenolic or polyurethane resin.  
   
   
       6 . Assembly according to any one of the preceding claims, characterised in that it further comprises at least one metallic foil ( 22 ) mounted on the foot of the blade, said non-metallic film ( 20 ) being arranged between the foil ( 22 ) and the aperture ( 101 ).  
   
   
       7 . Assembly according to any one of the preceding claims, characterised in that the foot ( 121 ) of the blade ( 12 ) is made of titanium, of aluminium or of steel or of one of their alloys.  
   
   
       8 . Turbomachine fan comprising assemblies for the mounting of the foot ( 121 ) of a blade ( 12 ) according to any one of the preceding claims, characterised in that the blades ( 12 ) are movable and the support is formed by the disk ( 10 ) of the rotor.  
   
   
       9 . Turbomachine compressor comprising assemblies for the mounting of the foot of a blade according to any one of  claims 1  to  7 , characterised in that the blades ( 12 ) are movable and the support is formed by the disk ( 10 ) of the rotor.  
   
   
       10 . Turbomachine compressor comprising assemblies for the mounting of the foot of a blade according to any one of  claims 1  to  7 , characterised in that the blades are fixed and the support is formed by a flange.  
   
   
       11 . Turbomachine equipped with assemblies for the mounting of the foot of a blade according to any one of  claims 1  to  7 .  
   
   
       12 . Method for the mounting of the foot of a turbine blade ( 12 ) made of metal, fixed or movable, in the aperture ( 101 ) of a metal support ( 10 ), characterised in that it comprises the following steps: 
 a) Arranged between the foot ( 121 ) and the aperture ( 101 ) is a non-metallic film ( 20 ) comprising polyamide, coated or impregnated with a polymer adhesive; and    b) The adhesive must be applied in such a way that the film ( 20 ) adheres to the foot ( 121 ) of the blade ( 12 ) and/or to the surface of the aperture ( 101 ).    
   
   
       13 . Mounting method according to  claim 12 , characterised in that the adhesive is thermo-polymerisable, and in that in the course of step b), the assembly comprising at least the foot ( 121 ) of the blade, the support ( 10 ), and the film ( 20 ) is placed in an autoclave brought to a temperature which will allow the adhesive to take.  
   
   
       14 . Mounting method according to  claim 12  or  13 , characterised in that the film ( 20 ) is arranged in such a way that the adhesive adheres to the foot ( 121 ) of the blade.  
   
   
       15 . Mounting method according to either of claims  12  or  13  characterised in that, during step a), the foot of the blade is clad with a metallic foil ( 22 ), said film ( 20 ) being arranged between the foil ( 22 ) and the aperture ( 121 ).  
   
   
       16 . Mounting method according to any one of  claims 12  to  15 , characterised in that the film ( 20 ) further comprises fibre glass and/or polytetrafluoroethylene.  
   
   
       17 . Mounting method according to any one of  claims 12  to  15 , characterised in that the film ( 20 ) comprises a fabric made of synthetic fibres.