Fastening assembly for blades of turbomachines having axial flow and method for producing such an assembly

Abstract

A fastening assembly for blades of turbomachines through which axial flow can take place, preferably compressors, includes a blade carrier having a lateral face, in which retaining groves are distributed along the circumference, with blades being inserted in the grooves, wherein a resilient tensioning element is provided between each groove base and the underside of the respective blade foot, the underside being located opposite of the groove base. The tensioning element is supported on the respective underside and on the respective groove base in a pretensioning manner, wherein a channel is provided both in the groove base and in the underside, with the tensioning element resting in the channels.

1 - 14 . (canceled) 
     
     
         15 . A fastening assembly for blades of turbomachines having axial flow, the fastening assembly comprising:
 a blade support with a central axis and a lateral surface concentric therewith, the blade support including a plurality of retaining grooves distributed along the periphery of the blade support, each of the plurality of retaining grooves comprising a groove base;   a plurality of blades each comprising a blade root and an underside, which includes a underside channel in which a resilient tensioning element rests along in the longitudinal extent, the underside located opposite of the blade root; and   wherein for each of the plurality of blades, the respective blade is inserted into the retaining groove of one of the plurality of retaining groves such that the respective groove base is located opposite the underside of the respective blade root, and such that the resilient tensioning element is arranged between each groove base and the opposed underside of the respective blade root and the respective resilient tensioning element is supported in a biased manner at the respective underside and at the respective groove base.   
     
     
         16 . The fastening assembly as claimed in  claim 15 ,
 wherein each of the plurality of grooves includes a groove channel in the groove base arranged opposite the respective underside channel such that the grove channel and the underside channel form a pair of channels.   
     
     
         17 . The fastening assembly as claimed in  claim 16 ,
 wherein the pair of channels extend parallel to the longitudinal extension of the retaining groove.   
     
     
         18 . The fastening assembly as claimed in  claim 16 ,
 wherein the pair of channels extend at an incline to the longitudinal extension of the retaining groove.   
     
     
         19 . The fastening assembly as claimed in  claim 18 ,
 wherein the longitudinal extension the retaining groove in the pair of channels is inclined with respect to the central axis, and   wherein the pair of channels extend parallel to the central axis.   
     
     
         20 . The fastening assembly as claimed in one of  claims 16 ,
 wherein the groove channel in the pair of channels discharges into at least one of the two end faces of the blade support, which border the lateral surface, and/or   wherein the underside channel in the pair of channels discharges into at least one of the two end faces of the blade root, which border the underside.   
     
     
         21 . The fastening assembly as claimed in one of  claims 16 ,
 wherein the pair of channels form a substantially circular recess.   
     
     
         22 . The fastening assembly as claimed in  claim 16 ,
 wherein each tensioning element is formed as a tensioning pin, of which the axial length is approximately equal to the length the respective channel groove-base and/or the respective underside channel.   
     
     
         23 . The fastening assembly as claimed in one  claim 16 ,
 wherein each tensioning element is plugged to secure against loss.   
     
     
         24 . The fastening assembly as claimed in  claim 16 ,
 wherein each blade is formed as a moving blade and the blade support is formed as a rotor element, and   wherein at least part of the radially outer lateral surface of the rotor element forms the respective lateral surface of the blade support.   
     
     
         25 . The fastening assembly as claimed in  claim 15 ,
 wherein each blade is formed as a guide blade and the blade support is formed as an annular guide blade support, and   wherein at least part of the radially inner lateral surface of the guide blade support forms the respective lateral surface of the blade support.   
     
     
         26 . A method for producing a fastening assembly as claimed in claim  1 , the method comprising:
 producing the blades and the blade support inclusive of all retaining grooves;   inserting a blade into one of the retaining grooves;   temporarily fixing the blade in the retaining groove;   producing two mutually opposed channels in pairs via a drilling process along an underside/groove base plane; and   inserting the tensioning element into the bore.   
     
     
         27 . The method as claimed in claim  12 ,
 wherein the temporary fixing is released before the inserting of the tensioning element.   
     
     
         28 . The method as claimed in claim  12 ,
 wherein the temporary fixing is released after the inserting of the tensioning element.   
     
     
         29 . A method for producing a fastening assembly as claimed in  claim 15 , comprising:
 producing the blade support without retaining grooves;   drilling the blade support, wherein the bores are each placed in such a way that merely part of the material surrounding the bore is removed when one of the retaining grooves is produced,   producing the retaining grooves, wherein, in each case, merely part of the material surrounding the respective bore is removed during this process, such that the rest of the material surrounding the respective bore forms the groove channel;   inserting blades, each having an underside channel already provided; and   inserting the tensioning element into the space defined by the mutually opposed channels.