Locking spacer for rotor blade

A blade disk assembly configured such that a blade and a spacer are alternately inserted into a dovetail slot provided on an outer circumferential surface of a disk put on a rotor, wherein the blade and the spacer are inserted into the dovetail slot in a state where dovetail joints of both the blade and the spacer are at an angle of 90 degrees to opposite sides of the dovetail slot, and then the blade and the spacer are rotated 90 degrees, such that the dovetail joints are fitted in the dovetail slot,

• wherein the blade and the spacer are assembled alternately into the dovetail slot one by one, and finally a locking spacer for a rotor blade is engaged in a remaining space of the dovetail slot, and
• the locking spacer for a rotor blade includes:
• a pair of first blocks each provided with a dovetail joint having a shape corresponding to a shape of a dovetail surface provided on each of axial opposite sides of the dovetail slot, and a stepped seating surface with a first bolt hole provided in an upper surface of the first block, and configured to have a size occupying a portion of an internal space of the dovetail slot;
• a second block having a size to be inserted into a remaining portion of the internal space of the dovetail slot, the remaining portion without being occupied by the pair of first blocks, and having a height corresponding to the seating surfaces of the first blocks;
• a fixing plate seated on both the stepped seating surfaces of the first blocks and an upper surface of the second block, and provided with second bolt holes corresponding to the first bolt holes;
• and
• a bolt screwed into the first bolt hole through an associated second bolt hole.

An assembly method for a locking spacer, in which a blade and a spacer are alternately inserted into a dovetail slot provided on an outer circumferential surface of a disk put on a rotor, wherein the blade and the spacer are inserted into the dovetail slot in a state where dovetail joints of both the blade and the spacer are at an angle of 90 degrees to opposite sides of the dovetail slot, then the blade and the spacer are rotated 90 degrees, such that the dovetail joints are fitted in the dovetail slot, the blade and the spacer are assembled alternately into the dovetail slot one by one, and finally the locking spacer is engaged in a remaining space of the dovetail slot, the assembly method comprising:

• engaging a dovetail joint of each of a pair of first blocks of the locking spacer with a dovetail surface provided on each of axial opposite sides of the dovetail slot to be fitted thereinto, a stepped seating surface with a first bolt hole being provided in an upper surface of the first block;
• inserting a second block of the locking spacer into a remaining portion of an internal space of the dovetail slot, the remaining portion without being occupied by the pair of first blocks:
• seating a fixing plate of the locking spacer on both the stepped seating surfaces of the first blocks and an upper surface of the second block, the second block having a height corresponding to the stepped seating surfaces of the first blocks;
• and
• screwing a bolt into the first bolt hole provided in each of the pair of first blocks through an associated second bolt hole provided in the fixing plate.