JPH0111922Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a jig for positioning a nozzle block, which is circumferentially welded to a nozzle block mounting hole formed in a turbine casing, coaxially with respect to the nozzle block mounting hole.

The nozzle arranged annularly in the high-pressure turbine casing is usually formed separately from the high-pressure turbine casing and is integrated with the high-pressure turbine casing by welding. For this reason, a plurality of nozzle block mounting holes into which the nozzle blocks are fitted are formed in an annular shape in the high pressure turbine casing, and the cylindrical nozzle blocks are inserted into these nozzle block mounting holes and fixed by welding around the circumference. It's summery. In this case, it is necessary to position and fix the nozzle block with respect to the high-pressure turbine casing so that it is coaxial with the nozzle block mounting hole, and conventionally, a shank vice has been used as an alignment jig for this purpose. As shown in FIG. 1a showing the conventional alignment work state of the nozzle block with respect to the turbine casing, and FIG. 1b showing the cross-sectional structure thereof, the nozzle block mounting hole 2 provided in the turbine casing 1 is The cylindrical nozzle block 3 that is fitted into the nozzle block 3 is held down against the turbine casing 1 by a set of three vices 4, and the nozzle block mounting hole 2 and the welded opening formed at the tip of the nozzle block 3 are The nozzle block 3 is positioned relative to the nozzle block mounting hole 2 so that the intervals between the tips 5 are all equal.

However, the distance between the nozzle blocks 3 is generally extremely short, and the shiyako vise 4, which is operated along the radial direction of the nozzle blocks 3, has the disadvantage that workability is very poor and it is difficult to securely fix the nozzle blocks 3. be.

The present invention was developed in view of the problems with the conventional nozzle block alignment jig for the turbine casing.
It is an object of the present invention to provide an alignment jig which is compact and easy to handle, and which can securely fix a nozzle block to a turbine casing.

The structure of the alignment jig for a turbine nozzle block according to the present invention that achieves this purpose is that the nozzle block is fixed to the inner peripheral surface of a nozzle block mounting hole formed in the turbine casing and the nozzle block is fixed to the nozzle block mounting hole. A bolt whose shaft portion is inserted into a weld groove formed between the bolt and the outer circumferential surface, and a bolt which is screwed onto the shaft portion of this bolt and is connected to the inner circumferential surface of the nozzle block mounting hole and the outer circumferential surface of the nozzle block. A first wedge block is formed with a pair of inclined surfaces that can be opposed to each other, and a shaft portion of the bolt passes through and locks to the head of the bolt, and the first wedge block has a pair of inclined surfaces facing oppositely to each other. a second wedge block formed with a pair of inclined surfaces, which face each other across the shaft of the bolt, one of which is pressed against the inner peripheral surface of the nozzle block mounting hole, and the other wedge block is pressed against the outer peripheral surface of the nozzle block; and a pair of presser feet each having one end slidingly in contact with the inclined surface of the first wedge block and the other end slidingly contacting the inclined surface of the second wedge block.

Hereinafter, an embodiment of the alignment jig according to the present invention will be described in detail with reference to FIGS. 2 to 4. As shown in FIG. 2 showing the external appearance of this embodiment and FIG. 3 showing its mounting cross-sectional structure, the inner circumferential surface of the tip of the nozzle block mounting hole 12 formed in the turbine casing 11 and the nozzle block Mounting hole 12
A cylindrical nozzle block 13 that is fitted into the
A first wedge block 16 is screwed into the shaft portion 15 of the bolt, which is inserted into the weld groove 14 formed between the outer peripheral surface of the tip of the bolt, and the first wedge block 16 and the head of the bolt are connected. 17, a second wedge block 18 which can be engaged with the head 17 of the bolt is positioned so as to be slidably fitted onto the shaft 15 of the bolt. The first wedge block 16 has an inclined surface 19 that can face the inner circumferential surface of the turbine casing 11.
and an inclined surface 20 that can face the outer circumferential surface of the nozzle block 13. In this embodiment, the interval between these inclined surfaces 19 and 20 is set to become narrower toward the head 17 of the bolt. . Further, the second wedge block 18 is formed with inclined surfaces 21 and 22 that are opposite to the inclined surfaces 19 and 20 of the first wedge block 16. In other words, these pair of inclined surfaces 21 and 2
2 is set so that it becomes wider toward the head 17 of the bolt. In addition, a pair of inclined surfaces 19, 2
If the inclination direction is set so that the interval between the slanted surfaces 21 and 22 of the second wedge block 18 becomes wider toward the head 17 of the bolt, the interval between the slanted surfaces 21 and 22 of the second wedge block 18 is
The direction of inclination must be set so that it becomes narrower toward the 7th side. A presser foot 25 has one end side having an inclined surface 23 in sliding contact with the inclined surface 19 of the first wedge block 16 and the other end side has an inclined surface 24 in sliding contact with the inclined surface 21 of the second wedge block 18; Inclined surface 2 slidingly in contact with inclined surface 20 of block 16
6 and a presser foot 28 having an inclined surface 27 whose other end side is in sliding contact with the inclined surface 22 of the second wedge block 18, the presser foot 28 is positioned opposite to the bolt shaft 15, and these presser feet 25, 28 are interconnected and held by a pair of holding bolts 29 passing through them and a lock nut 30 screwed into the holding bolts 29. Presser foot 25,2
8 is connected to the turbine casing 11 by the first wedge block 16.
is pressed against the inner peripheral surface of the nozzle block 13 and the outer peripheral surface of the nozzle block 13, but in this embodiment, the pressing surfaces 31,
32 are formed on inclined surfaces corresponding to the inner circumferential surface of the turbine casing 11 and the outer circumferential surface of the nozzle block 13 so as to be in close contact with the inner circumferential surface and the outer circumferential surface of the nozzle block 13, respectively.

Therefore, as shown in FIG. 4, which shows the appearance of the alignment jigs installed, at least three alignment jigs (four in this embodiment) of this embodiment are prepared, and the presser feet 25, 28 are
These are inserted into the welding groove portion 14 so that the pressing surfaces 31 and 32 of the nozzle block 13 face the inner circumferential surface of the turbine casing 11 and the outer circumferential surface of the nozzle block 13. In this case, loosen the lock nut 30 in advance,
The distance between presser feet 25 and 28 can be changed arbitrarily. Next, when the head 17 of the bolt is turned so that the first wedge block 16 is screwed into the bolt shaft 15, the first wedge block 16
and the second wedge block 18 becomes narrower, and as a result, the inclined surfaces 23, 24, 2 of the presser feet 25, 28
6 and 27 are the inclined surfaces 19 and 2 of the first wedge block 16.
0 and the second wedge block 18, the presser feet 25 and 28 are pushed apart from each other, and the interval between the welding grooves 14 is adjusted. By relatively adjusting the rotation of the bolt heads 17 of the plurality of alignment jigs, the nozzle block 13 can be integrally fixed to the turbine chamber 11 so as to be coaxial with the nozzle block mounting hole 12. . In this case, it is possible to avoid the possibility that the presser feet 25 and 28 will move parallel to the shaft portion 15 of the bolt and shake. After completing the positioning of the presser feet 25 and 28, tighten the lock nut 30 with the presser bolt 2.
9 to secure the presser feet 25 and 28.

Note that the shapes of the first wedge block 16, second wedge block 18, presser feet 25, 28, etc. described above are the same as those of the second wedge block 16, second wedge block 18,
The shape is not limited to that shown in the figure, and can be set to any shape. Furthermore, it is naturally possible to form the pressing surfaces 31, 32 of the presser feet 25, 28 into an arc shape corresponding to the radius of curvature of the welding groove 14, and the presser bolts 29 and lock nuts 30 are not necessarily required.

As described above, according to the alignment jig for a turbine nozzle block of the present invention, the alignment jig can be operated from the open end of the nozzle block mounting hole in the turbine casing to push and widen the gap between the weld grooves. Since the nozzle block is fixed to the turbine casing, the entire jig can be made compact, work efficiency is significantly improved, and reliable fixation can be achieved.

[Brief explanation of the drawing]

FIG. 1a is a plan view showing a state in which a nozzle block is fixed by a conventional method, FIG. 1b is a cross-sectional view thereof, and FIG. 2 is an embodiment of an alignment jig for a turbine nozzle block according to the present invention. 3 is a sectional view showing the installed state, and FIG. 4 is a plan view thereof. Also, in the figure, 11 is the turbine casing, 12 is the nozzle block mounting hole, and 13 is the turbine casing.
14 is a nozzle block, 14 is a welding groove, 15 is a bolt shaft, 16 is a first wedge block, 17 is a bolt head, 18 is a second wedge block, 19 to 24,
26 and 27 are inclined surfaces, and 25 and 28 are presser feet.

Claims (1)

[Scope of utility model registration request] a bolt whose shaft portion is inserted into a weld groove formed between the inner circumferential surface of a nozzle block mounting hole formed in the turbine casing and the outer circumferential surface of a nozzle block fixed to the nozzle block mounting hole; a first wedge block that is threaded onto the shaft of the bolt and is formed with a pair of inclined surfaces that can face the inner circumferential surface of the nozzle block mounting hole and the outer circumferential surface of the nozzle block; a second wedge block which passes through and locks onto the head of the bolt and has a pair of inclined surfaces opposite to the inclined surfaces of the first wedge block; They are opposed to each other, and one end is pressed against the inner circumferential surface of the nozzle block mounting hole, and the other is pressed against the outer circumferential surface of the nozzle block, and one end side of each is in sliding contact with the inclined surface of the first wedge block, and the other end thereof is in sliding contact with the inclined surface of the first wedge block. An alignment jig for a turbine nozzle block comprising a pair of presser feet whose sides slide against the inclined surface of the second wedge block.