Turbine blade

Abstract

A turbine blade is provided having a blade and a modular platform which follow one another along a longitudinal axis of the turbine blade. In order to provide a modular turbine blade that has an especially plain and simple design and that ensures an especially reliable, long-lasting, durable connection of the individual components among each other, the blade has an extension and the platform has an outer platform part and an at least two-part inner platform part which is radial in relation to the longitudinal axis and which lie laterally against the extension of the blade, and the outer platform part is designed as an endless platform frame that surrounds the outer edge of the inner platform part.

1 .- 13 . (canceled) 
     
     
         14 . A modular turbine blade comprising:
 a platform and a blade airfoil in succession along a longitudinal axis of the turbine blade,   wherein the blade airfoil has, at a first end, a projection in the longitudinal direction and   wherein the platform comprises, in radial relation to the longitudinal axis, an outer platform part and an inner platform part having at least two platform elements, which platform elements bear laterally against the projection of the blade airfoil and wherein the outer platform part is formed as an annular, endless, platform frame which grips around the outer edge of the inner platform part, wherein the platform frame, the inner platform part and the blade airfoil having the projection are each formed as separately produced components.   
     
     
         15 . The turbine blade as claimed in  claim 14 ,
 wherein the inner platform part comprises two, three or four platform elements.   
     
     
         16 . The turbine blade as claimed in  claim 15 ,
 wherein the platform elements are connected form-fittingly to the projection of the blade airfoil with respect to the longitudinal axis, in that a collar is formed at the free end of the projection, which collar provides, in conjunction with the step, a groove which is endless in the circumferential direction of the profile of the blade airfoil, into which groove the platform elements of the inner platform part are inserted in form-fitting fashion.   
     
     
         17 . The turbine blade as claimed in  claim 15 ,
 wherein the plurality of platform elements are coupled to one another and/or one platform element, a plurality of platform elements or all the platform elements are coupled to the blade airfoil by means of bolts seated in holes.   
     
     
         18 . The turbine blade as claimed in  claim 14 ,
 comprising, at said first and second end of the blade airfoil, a corresponding platform.   
     
     
         19 . The turbine blade as claimed in  claim 17 ,
 comprising, at said first and second end of the blade airfoil, a corresponding platform.   
     
     
         20 . The turbine blade as claimed in  claim 14 ,
 wherein the inner platform part and the platform frame has at least one tongue-and-groove connection.   
     
     
         21 . The turbine blade as claimed in  claim 17 ,
 wherein the inner platform part and the platform frame has at least one tongue-and-groove connection.   
     
     
         22 . The turbine blade as claimed in  claim 18 ,
 wherein the inner platform part and the platform frame has at least one tongue-and-groove connection.   
     
     
         23 . The turbine blade as claimed in  claim 14 ,
 wherein the platform frame bears laterally areally against the inner platform part and the bearing surface at least partially encloses, with the longitudinal axis, an angle greater than 0° and smaller than 90°.   
     
     
         24 . The turbine blade as claimed in  claim 17 ,
 wherein the platform frame bears laterally areally against the inner platform part and the bearing surface at least partially encloses, with the longitudinal axis, an angle greater than 0° and smaller than 90°.   
     
     
         25 . The turbine blade as claimed in  claim 18 ,
 wherein the platform frame bears laterally areally against the inner platform part and the bearing surface at least partially encloses, with the longitudinal axis, an angle greater than 0° and smaller than 90°.   
     
     
         26 . The turbine blade as claimed in  claim 20 ,
 wherein the platform frame bears laterally areally against the inner platform part and the bearing surface at least partially encloses, with the longitudinal axis, an angle greater than 0° and smaller than 90°.   
     
     
         27 . The turbine blade as claimed in  claim 24 ,
 wherein the angle is between 10° and 35°.   
     
     
         28 . The turbine blade as claimed in  claim 23 ,
 wherein the angle is between 10° and 35°.   
     
     
         29 . The turbine blade as claimed in  claim 14 ,
 wherein the platform frame has, on at least one outward-facing surface, a slot for receiving a sealing element.   
     
     
         30 . The turbine blade as claimed in  claim 14 ,
 wherein the platform frame is shrink-fitted onto the inner platform part and/or is soldered and/or welded thereto.   
     
     
         31 . The turbine blade as claimed in  claim 17 ,
 wherein the platform frame is shrink-fitted onto the inner platform part and/or is soldered and/or welded thereto.   
     
     
         32 . The turbine blade as claimed in  claim 18 ,
 wherein the platform frame is shrink-fitted onto the inner platform part and/or is soldered and/or welded thereto.   
     
     
         33 . The turbine blade as claimed in  claim 20 ,
 wherein the platform frame is shrink-fitted onto the inner platform part and/or is soldered and/or welded thereto.   
     
     
         34 . The turbine blade as claimed in  claim 23 ,
 wherein the platform frame is shrink-fitted onto the inner platform part and/or is soldered and/or welded thereto.   
     
     
         35 . The turbine blade as claimed in  claim 14 ,
 either formed as a turbine guide vane, wherein its attachment means is in each case arranged in monolithic fashion on at least one of the platform elements, or   formed as a turbine rotor blade, wherein its attachment means is in each case arranged in monolithic fashion on the projection of the blade airfoil.   
     
     
         36 . The turbine blade as claimed in  claim 17 ,
 either formed as a turbine guide vane, wherein its attachment means is in each case arranged in monolithic fashion on at least one of the platform elements, or   formed as a turbine rotor blade, wherein its attachment means is in each case arranged in monolithic fashion on the projection of the blade airfoil.   
     
     
         37 . The turbine blade as claimed in  claim 18 ,
 either formed as a turbine guide vane, wherein its attachment means is in each case arranged in monolithic fashion on at least one of the platform elements, or   formed as a turbine rotor blade, wherein its attachment means is in each case arranged in monolithic fashion on the projection of the blade airfoil.   
     
     
         38 . The turbine blade as claimed in  claim 20 ,
 either formed as a turbine guide vane, wherein its attachment means is in each case arranged in monolithic fashion on at least one of the platform elements, or   formed as a turbine rotor blade, wherein its attachment means is in each case arranged in monolithic fashion on the projection of the blade airfoil.   
     
     
         39 . The turbine blade as claimed in  claim 23 ,
 either formed as a turbine guide vane, wherein its attachment means is in each case arranged in monolithic fashion on at least one of the platform elements, or   formed as a turbine rotor blade, wherein its attachment means is in each case arranged in monolithic fashion on the projection of the blade airfoil.   
     
     
         40 . The turbine blade as claimed in  claim 30 ,
 either formed as a turbine guide vane, wherein its attachment means is in each case arranged in monolithic fashion on at least one of the platform elements, or   formed as a turbine rotor blade, wherein its attachment means is in each case arranged in monolithic fashion on the projection of the blade airfoil.