Turbine or compressor blade

Abstract

A blade for a turbine or a compressor, at least partially made of fiber-reinforced plastic, in particular carbon fiber reinforced plastic, being particularly durable under operating conditions is provided. The blade includes a blade body and a blade root. The blade body is substantially made of a folded fabric web made of fiber reinforced plastic, wherein a retaining loop is formed in the area of the fold, and wherein a blade surface is formed in the area of the fold, and wherein a blade surface is formed from the overlapping web ends. The blade root includes a longitudinal beam and at least two holders for anchoring the blade in a corresponding groove of a rotor, the holders being preferably each fixedly connected to the beam at both ends. The blade body is suspended on the beam by means of the retaining loop.

1 - 15 . (canceled) 
     
     
         16 . A blade for a turbine or a compressor, comprising:
 a blade airfoil; and   a blade root,   wherein the blade airfoil is produced essentially from a folded laminated fabric web consisting of a fiber-reinforced plastic, in which a retaining loop is formed in a region of the fold, and in which a blade surface is formed from the overlapping web ends,   wherein the blade root comprises an elongated carrier and at least two holders connected to the elongated carrier in each case in a positionally fixed manner for anchoring the blade in a corresponding groove of a turbine rotor assembly, and   wherein the blade airfoil is attached on the carrier by means of the retaining loop,   wherein the individual holders are interconnected by means of a flank section for stabilization, and   wherein the flank section is oriented essentially parallel to the carrier.   
     
     
         17 . The blade as claimed in  claim 16 , wherein each of the holders, in a region of the carrier, at least essentially transversely to the longitudinal extent of the blade airfoil, projects over the carrier on both sides. 
     
     
         18 . The blade as claimed in  claim 16 , further comprising a third holder for anchoring in a corresponding groove, which third holder is positionally fixed on the carrier at a distance from each of the two holders, which are especially attached at the ends, in the longitudinal direction of the carrier. 
     
     
         19 . The blade as claimed in  claim 16 ,
 wherein the flank section is connected to the holders in a form-fitting or materially bonding manner.   
     
     
         20 . The blade as claimed in  claim 16 , the blade including two flank sections which are attached in each case on the lateral edges of the holders which project over the blade airfoil. 
     
     
         21 . The blade as claimed in  claim 16 , wherein the carrier is round or essentially triangular in cross section. 
     
     
         22 . The blade as claimed in  claim 16 , wherein the carrier is produced from metal. 
     
     
         23 . The blade as claimed in  claim 16 , wherein the carrier is provided with a sliding layer on its surface. 
     
     
         24 . The blade as claimed in  claim 16 ,
 wherein the laminated fabric web is of an essentially unidirectional form, and   wherein the main fiber direction of the laminated fabric is aligned as far as possible along an operation-induced centrifugal force direction.   
     
     
         25 . The blade as claimed in  claim 16 , wherein the blade airfoil is provided at least partially with an erosion-proof coating on its surface. 
     
     
         26 . The blade as claimed in  claim 16 , wherein the fiber-reinforced plastic is formed as carbon fiber-reinforced plastic. 
     
     
         27 . A rotor assembly, comprising:
 a rotor, into which a groove is introduced, and   a blade as claimed in  claim 16 ,   wherein the blade root of the blade lies in the groove, and   wherein the blade root, connected to the rotor, is positionally fixed in the groove.   
     
     
         28 . The rotor assembly as claimed in  claim 27 , wherein the holders and the flank sections are supported on the lateral surfaces of the groove. 
     
     
         29 . The rotor assembly as claimed in  claim 27 , wherein the holders or the flank sections are supported on the lateral surfaces of the groove. 
     
     
         30 . The rotor assembly as claimed in  claim 27 , wherein the holders essentially fill out the groove cross section. 
     
     
         31 . The rotor assembly as claimed in  claim 27 , wherein both the groove and the holders are essentially of trapezoidal design.