Arrangement for axially securing rotating blades in arotor, and gas turbine having such an arrangement

Abstract

An arrangement for axial locking of rotating blades in a rotor is provided. The arrangement includes a shaft collar, a projection, plate-like sealing elements, and a blocking element. The sealing elements are provided for axially securing the rotating blades. At least one sealing element has an opening for securing the sealing elements against displacement in the circumferential direction. The blocking element is inserted in a recess from the end side of the shaft collar and blocks the displacement path of the sealing element. In order for the blocking element to be secured against unintentional releasing, the blocking element is fastened on the rotor disk using plastic deformation.

1 .- 8 . (canceled) 
     
     
         9 . An arrangement for axial locking of rotor blades in a rotor, comprising:
 a shaft collar;   a projection, arranged on an end-face side surface of the shaft collar in a region of a plurality of rotor blade retaining slots;   a plurality of plate-like sealing elements; and   a blocking element,   wherein on an outer periphery of the shaft collar the plurality of rotor blade retaining slots are provided, each rotor blade retaining slot extends in an axial direction of the rotor,   wherein the plurality of rotor blades are arranged in the shaft collar, each blade root corresponding to a rotor blade retaining slot,   wherein a radially outwardly open encompassing slot is provided in the projection,   wherein a radially inwardly open locking slot is arranged in each rotor blade and lies radially opposite the encompassing slot,   wherein the plurality of plate-like sealing elements are provided for axial locking of the plurality of rotor blades, each rotor blade engages in the encompassing slot and in the locking slot, forming an end-face sealing ring in a circumferential direction,   wherein at least one of the plurality of sealing elements includes an opening for securing the plurality of sealing elements against a displacement in a circumferential direction,   wherein a recess is disposed in a side surface of the shaft collar, the recess approximately aligns with the opening,   wherein the blocking element is seated in the recess and includes a bolt which projects on a first end face of the blocking element and engages in the opening, and   wherein the blocking element is safeguarded against loss using caulking which plastically deforms the blocking element.   
     
     
         10 . The arrangement as claimed in  claim 9 , wherein the blocking element includes a section that is formed in a shape of a wedge in cross section in a region of the recess. 
     
     
         11 . The arrangement as claimed in  claim 10 ,
 wherein the recess is formed corresponding to the wedge shape of the blocking element, and   wherein two sidewalls of the recess are inclined towards each other as seen in a radially outward direction.   
     
     
         12 . The arrangement as claimed in  claim 9 , wherein the recess is open in the radially outward direction. 
     
     
         13 . The arrangement as claimed in  claim 12 ,
 wherein a plurality of depressions are provided in the sidewalls of the recesses on the circumferential side of the rotor, and   wherein the blocking element is at least partially introduced into the plurality of depressions as a result of the plastic deformation.   
     
     
         14 . The arrangement as claimed in  claim 9 , wherein the recess is closed in the radially outward direction. 
     
     
         15 . The arrangement as claimed in  claim 9 , wherein the shaft collar is formed by a rotor disk. 
     
     
         16 . The arrangement as claimed in  claim 9 , wherein at least every other sealing element includes an opening for securing the plurality of sealing elements against displacement. 
     
     
         17 . The arrangement as claimed in  claim 9 , wherein a depression is disposed in a second end-face of the blocking element, and wherein the depression is used as a predetermined position at which a chisel may be used to strike the blocking element in order to assist in a caulking process. 
     
     
         18 . A gas turbine, comprising:
 an arrangement, comprising:
 a shaft collar, 
 a projection, arranged on an end-face side surface of the shaft collar in a region of a plurality of rotor blade retaining slots, 
 a plurality of plate-like sealing elements, and 
 a blocking element, 
   wherein on an outer periphery of the shaft collar the plurality of rotor blade retaining slots are provided, each rotor blade retaining slot extends in an axial direction of the rotor,   wherein the plurality of rotor blades are arranged in the shaft collar, each blade root corresponding to a rotor blade retaining slot,   wherein a radially outwardly open encompassing slot is provided in the projection,   wherein a radially inwardly open locking slot is arranged in each rotor blade and lies radially opposite the encompassing slot,   wherein the plurality of plate-like sealing elements are provided for axial locking of the plurality of rotor blades, each rotor blade engages in the encompassing slot and in the locking slot, forming an end-face sealing ring in a circumferential direction,   wherein at least one of the plurality of sealing elements includes an opening for securing the plurality of sealing elements against a displacement in a circumferential direction,   wherein a recess is disposed in a side surface of the shaft collar, the recess approximately aligns with the opening,   wherein the blocking element is seated in the recess and includes a bolt which projects on a first end face of the blocking element and engages in the opening, and   wherein the blocking element is safeguarded against loss using caulking which plastically deforms the blocking element.   
     
     
         19 . The gas turbine as claimed in  claim 18 , wherein the blocking element includes a section that is foamed in a shape of a wedge in cross section in a region of the recess. 
     
     
         20 . The gas turbine as claimed in  claim 19 ,
 wherein the recess is fanned corresponding to the wedge shape of the blocking element, and   wherein two sidewalls of the recess are inclined towards each other as seen in a radially outward direction.   
     
     
         21 . The gas turbine as claimed in  claim 18 , wherein the recess is open in the radially outward direction. 
     
     
         22 . The gas turbine as claimed in  claim 21 ,
 wherein a plurality of depressions are provided in the sidewalls of the recesses on the circumferential side of the rotor, and   wherein the blocking element is at least partially introduced into the plurality of depressions as a result of the plastic deformation.   
     
     
         23 . The gas turbine as claimed in  claim 18 , wherein the recess is closed in the radially outward direction. 
     
     
         24 . The gas turbine as claimed in  claim 18 , wherein the shaft collar is fanned by a rotor disk. 
     
     
         25 . The gas turbine as claimed in  claim 18 , wherein at least every other sealing element includes an opening for securing the plurality of sealing elements against displacement. 
     
     
         26 . The gas turbine as claimed in  claim 18 , wherein a depression is disposed in a second end-face of the blocking element, and wherein the depression is used as a predetermined position at which a chisel may be used to strike the blocking element in order to assist in a caulking process.