Blade ring for a turbomachine

Abstract

A blade ring for an axial turbomachine is provided, having a blade carrier with a number of retaining grooves and corresponding blades, the blade roots of which are inserted into the retaining grooves, wherein the blades, on the underside facing toward a groove base of the retaining groove, have a recess, the base of which is at least partially obliquely inclined relative to the groove base and in which recess is arranged one wedge-shaped clamping element for pressing the blade root against the support flanks. A spring element is provided in each recess, the spring force of which acts on the respective wedge-shaped clamping element along the retaining groove. Means are provided with which the wedge-shaped clamping element can be displaced temporarily into a position in which the blade root is seated in the retaining groove with play.

1 . A blade ring for an axial turbomachine, comprising
 a blade carrier having a number of retaining grooves having support flanks for blades and a corresponding number of blades, the blade roots of which, which are configured in a manner corresponding to the retaining grooves, are inserted into the retaining grooves,
 wherein at least one of the blades has on the blade root underside thereof facing toward a groove base of the retaining groove, a recess, the base of which is at least partially obliquely inclined with respect to the groove base of the retaining groove and in which there is arranged in each case a wedge-shaped clamping element for pressing the blade root against the support flanks, 
   a spring element provided in each recess, the spring force of which acts along the retaining groove on the respective wedge-shaped clamping element,
 wherein the recess is delimited by a first side wall and a second side wall located opposite the first side wall, 
 wherein the spring element is supported on the one hand on the first side wall and on the other hand on an obtuse end of the wedge-shaped clamping element, and 
   means for mounting the blade in the retaining groove without prestress, adapted such that the wedge-shaped clamping element can be displaced temporarily into a position in which the blade root sits in the retaining groove without prestress.   
     
     
         2 . The blade ring as claimed in  claim 1 ,
 wherein the spring element is in the form of a disk spring assembly and an opening is provided in the first side wall, through both of which a cylindrical pin arranged at the obtuse end of the wedge-shaped clamping element extends.   
     
     
         3 . The blade ring as claimed in  claim 1 ,
 wherein the means for mounting the blade comprises a threaded hole, which is arranged in the second side wall and into which a mounting screw can be screwed from the outside to displace the wedge-shaped clamping element toward the first side wall.   
     
     
         4 . The blade ring as claimed in  claim 1 , further comprising
 a plate-like securing element arranged between a blade root underside and a groove base of the retaining groove facing toward the blade root underside that secures each of the blades against displacement along the retaining groove, wherein the ends thereof bear laterally against the blade carrier.   
     
     
         5 . The blade ring as claimed in  claim 1 ,
 wherein the wedge-shaped clamping element has an at least partially hollow form.   
     
     
         6 . A compressor for a stationary gas turbine comprising:
 at least one blade ring as claimed in  claim 1 .   
     
     
         7 . The blade ring as claimed in  claim 1 , wherein all of the blades have a recess on the blade root underside thereof facing toward the groove base of the retaining groove.