Locking spacer for rotor blade

Patent metadata

Field	Value
Publication number	US-2018179902-A1
Application number	US-201715812491-A
Country	US
Kind code	A1
Filing date	Nov 14, 2017
Priority date	Dec 23, 2016
Publication date	Jun 28, 2018
Grant date	—

Abstract

A locking spacer, which is fitted in a dovetail slot provided on an outer circumferential surface of a disk put on a rotor shaft, includes: a pair of first blocks each provided with a dovetail joint, and configured to have a size occupying a portion of an internal space of the dovetail slot; a pair of second blocks having a size occupying a portion of the internal space of the dovetail slot, the portion not being occupied by the pair of first blocks, and each being provided with a locking groove; and a locking block having a size occupying a portion of the internal space of the dovetail slot, the portion not being occupied by the first and second blocks, and being provided with a rotating locking arm configured such that opposite end portions thereof are inserted into the locking grooves.

First claim

What is claimed is:

1 . A locking spacer for a rotor blade, which is fitted in a dovetail slot provided on an outer circumferential surface of a disk put on a rotor shaft, the locking spacer comprising:
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 configured to have a size occupying a portion of an internal space of the dovetail slot; a pair of second blocks having a size occupying a portion of the internal space of the dovetail slot, the portion without being occupied by the pair of first blocks, and each being provided with a locking groove; and a locking block having a size occupying a portion of the internal space of the dovetail slot, the portion without being occupied by the first and second blocks, and being provided with a rotating locking arm configured such that opposite end portions thereof are inserted into a pair of the locking grooves.

2 . The locking spacer of claim 1 , wherein each of the first blocks is provided with an inwardly stepped accommodation portion at a lower surface thereof, and
each of the second blocks is provided with a protruding portion at a lower surface thereof to be engaged with the accommodation portion.

3 . The locking spacer of claim 2 , wherein each of the first blocks is provided with a first guide protrusion on a side opposite to the dovetail joint of axial opposite sides thereof along a radial direction, and
each of the second blocks is provided with a first guide groove corresponding to the first guide protrusion.

4 . The locking spacer of claim 3 , wherein the protruding portion of each of the second blocks is provided with the first guide groove.

5 . The locking spacer of claim 1 , wherein each of the second blocks is provided with a second guide protrusion, and
the locking block is provided with second guide grooves corresponding to the second guide protrusions.

6 . The locking spacer of claim 1 , wherein the locking arm is connected to a rotating rod with a head thereof exposed to an upper surface of the locking block, and
the locking arm is engaged with or disengaged from the locking grooves by a rotation of the rotating rod.

7 . The locking spacer of claim 6 , wherein the rotating rod is a hexagon socket rod.

8 . The locking spacer of claim 1 , wherein the opposite end portions of the locking arm are formed to have arc-shaped curved surfaces, and entrances of the locking grooves are formed to be arc-shaped.

9 . The locking spacer of claim 8 , wherein each of the locking grooves includes a contact surface with which a side surface of the locking arm is brought into contact when the locking arm is angled at 90 degrees with respect to the second blocks.

10 . The locking spacer of claim 6 , wherein the head of the rotating rod exposed to the upper surface of the locking block includes an indicator indicating a direction along the opposite end portions of the locking arm.

11 . The locking spacer of claim 10 , wherein the indicator is a straight groove provided in the head of the rotating rod.

12 . The locking spacer of claim 1 , wherein the locking block is provided with a penetrating portion at a portion of an area thereof without being provided with the locking arm.

13 . The locking spacer of claim 1 , wherein the second block is made of a titanium material.

14 . 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 shaft, 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 at 90 degrees angle, 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 configured to have a size occupying a portion of an internal space of the dovetail slot; a pair of second blocks having a size occupying a portion of the internal space of the dovetail slot, the portion without being occupied by the pair of first blocks, and each being provided with a locking groove; and a locking block having a size occupying a portion of the internal space of the dovetail slot, the portion without being occupied by the first and second blocks, and being provided with a rotating locking arm configured such that opposite end portions thereof are inserted into a pair of the locking grooves.

15 . The blade disk assembly of claim 14 , wherein each of the first blocks is provided with an inwardly stepped accommodation portion at a lower surface thereof, and
each of the second blocks is provided with a protruding portion at a lower surface thereof to be engaged with the accommodation portion.

16 . The blade disk assembly of claim 15 , wherein each of the first blocks is provided with a first guide protrusion on a side opposite to the dovetail joint of axial opposite sides thereof along a radial direction, and
each of the second blocks is provided with a first guide groove corresponding to the first guide protrusion.

17 . The blade disk assembly of claim 16 , wherein each of the second blocks is provided with a second guide protrusion, and
the locking block is provided with second guide grooves corresponding to the second guide protrusions.

18 . The blade disk assembly of claim 14 , wherein the opposite end portions of the locking arm are formed to have arc-shaped curved surfaces,
entrances of the locking grooves are formed to be arc-shaped, and each of the locking grooves includes a contact surface with which a side surface of the locking arm is brought into contact when the locking arm is angled at 90 degrees with respect to the second blocks.

19 . A method for assembling a locking spacer for a rotor blade, 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 shaft, 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 at 90 degrees angle, 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 according to claim 1 is engaged in a remaining space of the dovetail slot, the method comprising:
engaging the dovetail joint of each of the pair of first blocks with a dovetail surface provided on each of axial opposite sides of the dovetail slot to be fitted thereinto;
inserting the pair of second blocks into the portion of the internal space of the dovetail slot, the portion without being occupied by the pair of first blocks, and bring the first blocks and the second blocks into contact with the dovetail surface;
inserting the locking block into the portion of the internal space of the do

Assignees

• Doosan Heavy Ind & Construction Co Ltd

Inventors

• Goroshchak Iurii
• Kwak Joohwan

Classifications

• F01D5/3038

  the slot having inwardly directed abutment faces on both sides · CPC title

• F01D5/3023 Primary

  of radial insertion type, e.g. in individual recesses · CPC title

• F01D5/32 Primary

  Locking, e.g. by final locking blades or keys · CPC title

• F05D2260/30

  Retaining components in desired mutual position · CPC title

• F05D2260/36

  by a form fit connection, e.g. by interlocking · CPC title