Method for adjusting curvature of stationary vane segment, method for manufacturing stationary body of axial flow rotating machine, and tool for adjusting curvature of stationary vane segment

Abstract

To easily mount a stationary blade segment at an inner peripheral side of a stationary blade holding ring.SOLUTION: A subject of a curvature adjusting method is an arcuate stationary blade segment 31 in which a plurality of stationary blades is mounted while being arranged side by side in a circumferential direction at an outer peripheral side of an arcuate inner coupling member. The curvature adjusting method executes: a jig preparing step of preparing a curvature adjusting jig 40 comprising a first end, a second end and a distance adjusting mechanism capable of changing a distance between the first end and the second end; a jig mounting step of fixing the first end at a first position of the inner coupling member and fixing the second end at a second position of the inner coupling member in a state where the distance adjusting mechanism is disposed at an inner peripheral side of the inner coupling member; and a curvature adjusting step of operating the distance adjusting mechanism after the jig mounting step and changing the distance between the first end and the second end of the curvature adjusting jig in such a manner that a curvature of the arcuate stationary blade segment becomes a purposed curvature.SELECTED DRAWING: Figure 8

Description

[Technical field]

[0001] The present disclosure relates to a technique for adjusting the curvature of a stator vane segment in an axial flow rotary machine. [Background technology]

[0002] The axial flow rotating machine has a rotor that rotates about an axis, a plurality of stator vane segments arranged in a circumferential direction about the axis, and a stator vane retaining ring that extends in the circumferential direction and retains the plurality of stator vane segments. Each of the plurality of stator vane segments has a plurality of stator vanes and an inner connecting member that is arc-shaped about the axis. The plurality of stator vanes are attached to the outer periphery of the inner connecting member in a line in the circumferential direction.

[0003] The following Patent Document 1 discloses a method for disassembling a steam turbine, which is a type of axial flow rotary machine. This steam turbine has a blade ring upper half and a blade ring lower half as a plurality of stator vane segments. This steam turbine also has an inner casing upper half and an inner casing lower half as a plurality of stator vane retaining rings. In the department Both circumferential ends of the upper half of the inner casing are connected to both ends of the lower half of the blade ring. Both circumferential ends of the upper half of the inner casing are connected to both ends of the lower half of the inner casing. The upper half of the blade ring is disposed on the inner circumferential side of the upper half of the inner casing. The lower half of the blade ring is disposed on the inner circumferential side of the lower half of the inner casing.

[0004] In the disassembling method of a steam turbine described in Patent Document 1, first, the upper half of the inner casing is removed from the lower half of the inner casing. Next, a roundness retention device is attached to both circumferential ends of the lower half of the blade ring on the outer circumferential side of the lower half of the blade ring. The roundness retention device connects both circumferential ends of the lower half of the blade ring on the outer circumferential side of the lower half of the blade ring to both circumferential ends of the lower half of the inner circumferential side of the lower half of the inner casing. Then, the upper half of the blade ring is removed from the lower half of the blade ring to which the roundness retention device is attached. In the disassembling method of a steam turbine described in Patent Document 1, as described above, the roundness retention device connects both circumferential ends of the lower half of the blade ring on the outer circumferential side of the lower half of the blade ring to both circumferential ends of the lower half of the inner circumferential side of the lower half of the inner casing. For this reason, in the steam turbine disassembly method described in Patent Document 1, even if the upper half of the blade ring is removed from the lower half of the blade ring, deformation of both circumferential ends of the lower half of the blade ring toward the inward direction can be suppressed, and the circularity of the lower half of the blade ring can be maintained. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2012-013046 A Summary of the Invention [Problem to be solved by the invention]

[0006] In the method described in the above Patent Document 1, as described above, the circularity retaining device connects both circumferential ends of the lower half of the blade ring on the outer circumferential side of the lower half of the blade ring with both circumferential ends of the lower half of the inner casing on the inner circumferential side of the lower half of the inner casing, thereby suppressing deformation of both circumferential ends of the lower half of the blade ring toward the inner circumferential side. Therefore, when the lower half of the blade ring is removed from the lower half of the inner casing, the circularity of the lower half of the blade ring, in other words, the curvature of the lower half of the blade ring, cannot be maintained. For this reason, in the method described in the above Patent Document 1, when the lower half of the blade ring, which is a stator vane segment, is attached to the lower half of the inner casing as a stator vane retaining ring, there is a high possibility that the curvature of the lower half of the blade ring, which is a stator vane segment, is not a predetermined curvature. In this way, it is difficult to attach the stator vane segment to the inner circumferential side of the stator vane retaining ring when the curvature of the stator vane segment is not a predetermined curvature.

[0007] Therefore, an object of the present disclosure is to provide a technique that enables a stator blade segment to be easily attached to the inner peripheral side of a stator blade retaining ring. [Means for solving the problem]

[0008] A method for adjusting the curvature of a vane segment as one aspect for achieving the above object is directed to an arc-shaped vane segment in which a plurality of vanes are attached in a circumferential arrangement to the outer periphery of an arc-shaped inner connecting member. This curvature adjustment method includes the following steps: a jig preparation step of preparing a curvature adjustment jig having a first end, a second end, and a distance adjustment mechanism capable of changing the distance between the first end and the second end; a jig attachment step of fixing the first end of the curvature adjustment jig to a first position of the inner connecting member and fixing the second end of the curvature adjustment jig to a second position of the inner connecting member that is spaced apart in the circumferential direction from the first position of the inner connecting member with the distance adjustment mechanism of the curvature adjustment jig disposed on the inner side of the inner connecting member of the stator vane segment; and a curvature adjustment step of operating the distance adjustment mechanism after the jig attachment step to change the distance between the first end and the second end of the curvature adjustment jig so that the curvature of the outer peripheral edge of the arc-shaped stator vane segment becomes a target curvature. The curvature adjustment jig has a first pedestal including the first end, a second pedestal including the second end, a first fixing part capable of fixing the first end to the first position of the inner connecting member, a second fixing part capable of fixing the second end to the second position of the inner connecting member, and the distance adjustment mechanism. The distance adjustment mechanism has a trunk, a first bar extending from the trunk to a first side of both sides in a distance adjustment direction so as to be distance-adjustable, and a second bar extending from the trunk to a second side opposite the first side in the distance adjustment direction so as to be distance-adjustable. The first pedestal is attached to a portion of the first bar on the first side so as to be swingable about an axis extending in a direction perpendicular to the distance adjustment direction. The second pedestal is attached to a portion of the second bar on the second side so as to be swingable about an axis extending in a direction perpendicular to the distance adjustment direction.

[0009] In this aspect, at the stage where the curvature of the stator vane segment is adjusted using the curvature adjustment jig, a distance adjustment mechanism of the curvature adjustment jig is located on the inner circumferential side of the stator vane segment. Therefore, the stator vane segment to which the curvature adjustment jig is attached can be attached to the inner circumferential side of the stator vane retaining ring without the curvature adjustment jig interfering with the stator vane retaining ring. That is, in this aspect, the stator vane segment can be attached to the inner circumferential side of the stator vane retaining ring in a state in which the curvature of the stator vane segment is a predetermined curvature. Therefore, in this aspect, the stator vane segment can be easily attached to the inner circumferential side of the stator vane retaining ring.

[0010] As one aspect of the method for achieving the above object, a method for manufacturing a stationary body of an axial flow rotating machine includes the steps of: The method for adjusting the curvature of a stator vane segment according to the above aspect is performed, and further includes a component preparation step of preparing the stator vane segment and a stator vane retaining ring having an arc shape and to which the stator vane segment is attached on its inner circumferential side, a stator vane segment attachment step of attaching the stator vane segment, to which the curvature adjustment jig is attached after the curvature adjustment step, to the inner circumferential side of the stator vane retaining ring, and a jig removal step of removing the curvature adjustment jig from the stator vane segment after the stator vane segment attachment step.

[0011] In this aspect, the stator blade segments can be easily attached to the inner periphery side of the stator blade retaining ring, thereby improving the manufacturing efficiency of the stationary body.

[0012] The curvature adjustment jig for a stator vane segment as one embodiment for achieving the above object is intended for a stator vane segment in which a plurality of stator vanes are attached in a circumferential arrangement to the outer circumferential side of an arc-shaped inner connecting member. The curvature adjustment jig has a first seat including a first end, a second seat including a second end, a first fixing part capable of fixing the first end to a first position of the inner connecting member, a second fixing part capable of fixing the second end to a second position of the inner connecting member spaced apart from the first position in the circumferential direction, and a distance adjustment mechanism capable of changing the distance between the first end and the second end. The distance adjustment mechanism adjusts the distance between the first end and the second end of the inner connecting member by adjusting the distance between the first end and the second end of the inner connecting member. The distance adjustment mechanism includes a body and The actuator has a first bar extending from the trunk portion to a first side of both sides in the distance adjustment direction so as to be distance-adjustable, and a second bar extending from the trunk portion to a second side opposite the first side in the distance adjustment direction so as to be distance-adjustable. The first pedestal is attached to a portion of the first bar portion on the first side so as to be swingable about an axis extending in a direction perpendicular to the distance adjustment direction. The second pedestal is attached to a portion of the second bar portion on the second side so as to be swingable about an axis extending in a direction perpendicular to the distance adjustment direction.

[0013] When the curvature adjustment jig of this aspect is attached to the stator vane segment, a first end of the first seat is fixed to a first position of the inner connecting member of the stator vane segment, and a second end of the second seat is fixed to a second position of the inner connecting member of the stator vane segment. In this state, the distance adjustment mechanism of the curvature adjustment jig is located on the inner circumferential side of the stator vane segment. Therefore, the stator vane segment to which the curvature adjustment jig is attached can be attached to the inner circumferential side of the stator vane retaining ring without the curvature adjustment jig interfering with the stator vane retaining ring. Effect of the Invention

[0014] In one aspect of the present disclosure, the stator vane segments can be easily attached to the inner periphery of the stator vane retaining ring. [Brief description of the drawings]

[0015] [Figure 1] FIG. 1 is a cutaway side view of a main portion of a gas turbine according to an embodiment of the present disclosure. [Diagram 2]FIG. 2 is an enlarged view of part II in FIG. [Diagram 3] 3 is a cross-sectional view taken along line III-III in FIG. 2. [Figure 4] FIG. 2 is a perspective view of a vane segment in an embodiment according to the present disclosure. [Diagram 5] FIG. 2 is a front view of a stator vane segment and a curvature adjusting jig in an embodiment according to the present invention. [Figure 6] 6 is a cross-sectional view taken along line VI-VI in FIG. 5. [Figure 7] 4 is a flowchart showing the steps of a method for manufacturing a stationary body in one embodiment of the present invention. [Figure 8] 1A to 1C are explanatory diagrams showing a manufacturing process of a stationary body in one embodiment according to the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] Hereinafter, one embodiment of the present invention will be described in detail with reference to FIGS.

[0017] "Axial flow rotating machine" First, a gas turbine including an axial flow rotary machine will be described with reference to FIGS. 1 to 4. FIG.

[0018] As shown in FIG. 1, the gas turbine 1 includes a compressor 11 that compresses outside air to generate compressed air, a combustor 15 that combusts fuel from a fuel supply source in the compressed air to generate combustion gas, and a turbine 16 that is driven by the combustion gas.

[0019] The compressor 11 is a type of axial flow rotary machine. The compressor 11 has a compressor rotor 12 that rotates about an axis Ar, a compressor casing 13 that covers the compressor rotor 12, and a plurality of stator blade rows 14. The turbine 16 is also a type of axial flow rotary machine. The turbine 16 has a turbine rotor 17 that rotates about an axis Ar, a turbine casing 18 that covers the turbine rotor 17, and a plurality of stator blade rows 19.

[0020] The compressor 11 is disposed on the upstream axial side Dau of the upstream axial side Dau and the downstream axial side Dad in the axial direction Da along which the axis Ar extends, relative to the turbine 16. The compressor rotor 12 and the turbine rotor 17 are located on the same axis Ar and are connected to each other to form a gas turbine rotor 2. To this gas turbine rotor 2, for example, a rotor of a generator is connected.

[0021] The compressor rotor 12 has a rotor shaft 12s extending in an axial direction Da about the axis Ar, and a plurality of rotor blade rows 12b. The plurality of rotor blade rows 12b are arranged on the rotor shaft 12s in the axial direction Da. Each of the rotor blade rows 12b has a plurality of rotor blades arranged in a circumferential direction Dc with respect to the axis Ar. One of the plurality of stator blade rows 14 is arranged on the axial downstream side Dad of the plurality of rotor blade rows 12b. The plurality of stator blade rows 14 are provided on the inner peripheral side of the compressor casing 13.

[0022] The turbine rotor 17 has a rotor shaft 17s extending in an axial direction Da about the axis Ar, and a plurality of rotor blade rows 17b. The plurality of rotor blade rows 17b are arranged in the axial direction Da on the rotor shaft 17s. Each of the rotor blade rows 17b has a plurality of rotor blades arranged in a circumferential direction Dc with respect to the axis Ar. One of the plurality of stator blade rows 19 is arranged on the axial upstream side Dau of the plurality of rotor blade rows 17b. The plurality of stator blade rows 19 are provided on the inner peripheral side of the turbine casing 18.

[0023] The gas turbine 1 further includes an intermediate casing 3. The compressor casing 13, the intermediate casing 3, and the turbine casing 18 are connected to each other in this order in the axial direction Da. The combustor 15 is provided in the intermediate casing 3.

[0024] As shown in Figs. 2 and 3, the compressor casing 13 has a cylindrical casing body 20 centered on the axis Ar, and a stator vane retaining ring 21 arranged on the inner peripheral side of the casing body 20. For convenience of assembly, the casing body 20 has an upper half casing and a lower half casing. The upper half casing forms the upper half of the casing body 20. The lower half casing forms the lower half of the casing body 20. The stator vane retaining ring 21 is cylindrical and centered on the axis Ar. For convenience of assembly, the stator vane retaining ring 21 has an upper half stator vane retaining ring 21u and a lower half stator vane retaining ring 21d. The upper half stator vane retaining ring 21u forms the upper half of the stator vane retaining ring 21. The lower half stator vane retaining ring 21d forms the lower half of the stator vane retaining ring 21.

[0025] The stator blade retaining ring 21 is recessed from the inner peripheral surface toward the radially outer side Dro relative to the axis Ar, and has a plurality of annular grooves 22 formed around the axis Ar. The plurality of annular grooves 22 are aligned in the axial direction Da.

[0026] The compressor 11 has a plurality of stator blade rings 30. The plurality of stator blade rings 30 are arranged in the axial direction Da. Each stator blade ring 30 has one of the plurality of stator blade rows 14 described above. The outer peripheral portion of each stator blade ring 30 is fitted into one of the plurality of annular grooves 22. For convenience of assembly, each stator blade ring 30 can be divided into a plurality of stator blade segments 31 in the circumferential direction Dc. In this embodiment, one stator blade ring 30 can be divided into eight stator blade segments 31. Of the eight stator blade segments 31, the outer peripheral portions of four stator blade segments 31 are fitted into one annular groove 22 of the upper half stator blade retaining ring 21u. The outer peripheral portions of the remaining four stator blade segments 31 are fitted into one annular groove 22 of the lower half stator blade retaining ring 21d. Here, one stator blade ring 30 is constituted by eight stator blade segments 31, however, one stator blade ring may be constituted by fewer than eight, specifically six or four stator blade segments, or one stator blade ring may be constituted by more than eight, such as ten or twelve stator blade segments.

[0027] The stationary body of the compressor 11 in this embodiment has an upper half stator vane retaining ring 21u, a lower half stator vane retaining ring 21d, and a plurality of stator vane segments 31 attached thereto.

[0028] As shown in Fig. 4, one stator vane segment 31 has an arc shape. This stator vane segment 31 has a plurality of stator vanes 32, a connecting holder 35 as an inner connecting member, and a connecting band 39 as an outer connecting member.

[0029] The plurality of stator vanes 32 are arranged in the circumferential direction Dc between the connecting holder 35 and the connecting band 39. The stator vane 32 has a blade body 33 extending in the radial direction Dr, an inner shroud 34i provided on the radial inner side Dri of the blade body 33, and an outer shroud 34o provided on the radial outer side Dro of the blade body 33. The connecting holder 35 is formed in an arc shape. The inner shroud 34i of each stator vane 32 is attached to this connecting holder 35. The connecting band 39 is also formed in an arc shape. The outer shroud 34o of each stator vane 32 is connected to this connecting band 39 by, for example, welding or screws. Therefore, this connecting band 39 connects the outer shrouds 34o of each stator vane 32 to each other. The aforementioned outer peripheral portion of the stator blade segment 31 that fits into the annular groove 22 of the stator blade retaining ring 21 includes the connecting band 39 and the outer shroud 34 o of each stator blade 32 .

[0030] If the curvature of the outer peripheral portion of the stator vane segment 31 does not match the curvature of the annular groove 22, it is difficult to fit the outer peripheral portion of the stator vane segment 31 into the annular groove 22. Even if the curvature of the connecting holder 35 before assembly is as designed and the curvature of the connecting band 39 before assembly is as designed, these curvatures may change during the assembly process of the stator vane segment 31. For example, when the outer shroud 34o of each stator vane 32 is welded to the connecting band 39, the curvature of the outer peripheral portion of the stator vane segment 31 becomes smaller. Therefore, a method of adjusting the curvature of the stator vane segment 31 and the like will be described below.

[0031] "Method for adjusting curvature of stationary vane segment, method for manufacturing stationary body of axial flow rotating machine, and tool for adjusting curvature of stationary vane segment" A method for adjusting the curvature of a stator vane segment, a method for manufacturing a stationary body of an axial flow rotating machine, and a jig for adjusting the curvature of a stator vane segment will be described with reference to Figs.

[0032] First, a curvature adjusting jig 40 used in the method for adjusting the curvature of a stator vane segment will be described with reference to FIGS.

[0033] The curvature adjustment jig 40 has a first pedestal 41a, a second pedestal 41b, a first fixing portion 46a, a second fixing portion 46b, and a turnbuckle 50 serving as a distance adjustment mechanism.

[0034] The turnbuckle 50 includes a body 51, a first bar 53a, and a second bar 53b. And, do. The trunk 51 is formed with a first female screw 52a extending in the distance adjustment direction Dd on a first side Dd1 of both sides in the distance adjustment direction Dd. The trunk 51 is further formed with a second female screw 52b extending in the distance adjustment direction Dd on a second side Dd2 of both sides in the distance adjustment direction Dd. The second female screw 52b is a reverse screw with respect to the first female screw 52a. That is, when the first female screw 52a is a right-handed screw, the second female screw 52b is a left-handed screw. The first rod 53a and the second rod 53b are both rods extending in the distance adjustment direction Dd. The first rod 53a is formed with a first male screw 54a screwed into the first female screw 52a on a second side Dd2. The second rod 53b is formed with a second male screw 54b screwed into the second female screw 52b on a first side Dd1.

[0035] The first pedestal 41a and the second pedestal 41b each have a holder contact plate portion 43 that can contact the inner peripheral side surface of the connecting holder 35, and a buckle connecting plate portion 44 that can be connected to the turnbuckle 50. The buckle connecting plate portion 44 spreads from the edge of the holder contact plate portion 43 in a direction intersecting with the holder contact plate portion 43. A part of the surface of the holder contact plate portion 43 on the first pedestal 41a forms a first end 42a. Also, a part of the surface of the holder contact plate portion 43 on the second pedestal 41b forms a second end 42b. The buckle connecting plate portion 44 of the first pedestal 41a is attached to a portion of the first side Dd1 of the first bar material 53a via a pin 45. Therefore, the first pedestal 41a can swing around an axis extending in a direction perpendicular to the distance adjustment direction Dd with respect to the first bar material 53a. The buckle connecting plate portion 44 of the second seat 41b is attached to the second side Dd2 of the second bar 53b via a pin 45. Therefore, the second seat 41b is swingable relative to the second bar 53b around an axis extending in a direction perpendicular to the distance adjustment direction Dd.

[0036] Both the first fixing portion 46a and the second fixing portion 46b have bolts 47. In the inner peripheral side surface of the connecting holder 35, a portion on one side in the circumferential direction Dc is the first position 36a, and a portion on the other side in the circumferential direction Dc is the second position 36b. Therefore, the second position 36b is a position spaced apart from the first position 36a in the circumferential direction Dc. The connecting holder 35 is formed with a first screw hole 37a and a second screw hole 37b recessed from the inner peripheral side surface toward the radially outer side Dro. The first screw hole 37a is formed in the vicinity of the first position 36a described above, and the second screw hole 37b is formed in the vicinity of the second position 36b described above. When fixing the first end 42a of the curvature adjusting jig 40 to the first position 36a of the connecting holder 35, first, the first end 42a of the first seat 41a is brought into contact with the first position 36a of the connecting holder 35. Next, the bolt 47 of the first fixing portion 46a is screwed into the first screw hole 37a of the connecting holder 35 via the holder contact plate portion 43 of the first pedestal 41a. As a result, the first end 42a of the curvature adjustment jig 40 is fixed to the first position 36a of the connecting holder 35. In addition, when fixing the second end 42b of the curvature adjustment jig 40 to the second position 36b of the connecting holder 35, first, the second end 42b of the second pedestal 41b is brought into contact with the second position 36b of the connecting holder 35. Next, the bolt 47 of the second fixing portion 46b is screwed into the second screw hole 37b of the connecting holder 35 via the holder contact plate portion 43 of the second pedestal 41b. As a result, the second end 42b of the curvature adjustment jig 40 is fixed to the second position 36b of the connecting holder 35.

[0037] When the body 51 of the turnbuckle 50 is rotated around an axis extending in the distance adjustment direction Dd, the first bar 53a moves relative to the body 51 toward one of the first side Dd1 and the second side Dd2 in the distance adjustment direction Dd, and the second bar 53b moves relative to the body 51 toward the other side. Therefore, in the curvature adjustment jig 40 described above, by rotating the body 51 of the turnbuckle 50, the distance between the first end 42a in the first pedestal 41a and the second end 42b in the second pedestal 41b can be changed.

[0038] Next, a method for adjusting the curvature of the stator vane segment 31 and a method for manufacturing the stationary body of the axial flow rotating machine will be described with reference to the flowchart shown in FIG.

[0039] First, a component preparation step S1 is performed. In this component preparation step S1, components constituting a stationary body of the compressor 11, which is an axial flow rotary machine, are prepared. The components constituting this stationary body include an upper half stator vane retaining ring 21u, a lower half stator vane retaining ring 21d, and a plurality of stator vane segments 31 attached thereto.

[0040] Next, a jig preparation step S3 is performed. In this jig preparation step S3, the curvature adjusting jig 40 described above is prepared.

[0041] Next, a jig attachment step S4 is performed. In this jig attachment step S4, the curvature adjustment jig 40 is attached to the connecting holder 35 of the stator vane segment 31. Specifically, first, the turnbuckle 50 of the curvature adjustment jig 40 is disposed on the inner circumferential side of the stator vane segment 31. Next, as described above, the first end 42a of the first pedestal 41a is brought into contact with the first position 36a of the connecting holder 35. Then, the bolt 47 of the first fixing portion 46a is screwed into the first screw hole 37a of the connecting holder 35 via the holder contact plate portion 43 of the first pedestal 41a. As a result, the first end 42a of the curvature adjustment jig 40 is fixed to the first position 36a of the connecting holder 35. Furthermore, the second end 42b of the second pedestal 41b is brought into contact with the second position 36b of the connecting holder 35. Then, the bolt 47 of the second fixing portion 46b is screwed into the second screw hole 37b of the connecting holder 35 via the holder contact plate portion 43 of the second pedestal 41b. As a result, the second end 42b of the curvature adjustment jig 40 is fixed to the second position 36b of the connecting holder 35. This completes the jig attachment process S4.

[0042] Next, a curvature adjustment process S5 is performed. In this curvature adjustment process S5, the body portion 51 of the turnbuckle 50 is rotated to change the distance between the first end 42a and the second end 42b of the curvature adjustment jig 40 so that the curvature of the edge on the outer circumferential side of the stator vane segment 31 becomes a target curvature. Here, the target curvature is the curvature of the inner peripheral edge of the stator blade retaining ring 21, specifically, the curvature of the groove bottom surface of the annular groove 22. For this reason, the curvature of the outer peripheral edge of the stator blade segment 31 is set to the target curvature. RateIn this case, for example, first, a straight-line distance between a position where an end of one side of the stator vane segment 31 in the circumferential direction Dc contacts and a position where an end of the other side of the stator vane segment 31 in the circumferential direction Dc contacts is measured on the bottom surface of the annular groove 22, and this straight-line distance is set as a target distance. Then, the body 51 of the turnbuckle 50 is rotated so that the straight-line distance between an end of one side of the stator vane segment 31 in the circumferential direction Dc on the outer circumferential edge and an end of the other side of the stator vane segment 31 in the circumferential direction Dc on the outer circumferential edge becomes the target distance.

[0043] In the curvature adjusting method S2 of the stator vane segment 31, the above-mentioned jig preparation step S3, jig attachment step S4, and curvature adjustment step S5 are performed. Note that the jig preparation step S3 may be performed before the jig attachment step S4, or may be performed before the part preparation step S1.

[0044] Next, a stator vane segment mounting step S6 is performed. In this stator vane segment mounting step S6, as shown in Fig. 8, the stator vane segment 31 to which the curvature adjusting jig 40 has been attached after the curvature adjusting step S5 is mounted on the inner peripheral side of the stator vane retaining ring 21. At this time, the stator vane segment 31 is positioned so that the outer peripheral edge of the stator vane segment 31 is positioned on an extension line in the circumferential direction Dc of the groove bottom surface of the annular groove 22. Then, the stator vane segment 31 to which the curvature adjusting jig 40 has been attached is moved in the circumferential direction Dc to insert the outer peripheral portion of the stator vane segment 31 into the annular groove 22. Then, when the outer peripheral portion of the stator vane segment 31 is positioned at a target position Pt in the annular groove 22, mounting of the stator vane segment 31 to the stator vane retaining ring 21 is completed.

[0045] When the attachment of the stator vane segment 31 is completed, a jig removal step S7 is performed. In the jig removal step S7, the curvature adjusting jig 40 is removed from the stator vane segment 31.

[0046] When all the stator blade segments 31 have been attached to the annular groove 22, the stationary body is completed.

[0047] As described above, in this embodiment, at the stage where the curvature of the stator vane segment 31 is adjusted using the curvature adjustment jig 40, the turnbuckle 50 of the curvature adjustment jig 40 is located on the inner circumferential side of the stator vane segment 31. Therefore, the stator vane segment 31 to which the curvature adjustment jig 40 is attached can be attached to the inner circumferential side of the stator vane retaining ring 21 without the curvature adjustment jig 40 interfering with the stator vane retaining ring 21. That is, in this embodiment, the stator vane segment 31 can be attached to the inner circumferential side of the stator vane retaining ring 21 in a state in which the curvature of the stator vane segment 31 is a predetermined curvature. Therefore, in this embodiment, the stator vane segment 31 can be easily attached to the inner circumferential side of the stator vane retaining ring 21.

[0048] "Variations" In the above embodiment, the first fixing portion 46a and the second fixing portion 46b of the curvature adjusting jig 40 each have a bolt 47. However, each fixing portion may have any member as long as it can fix each pedestal to a desired position of the connecting holder 35, and may have, for example, a clamp that clamps a part of the connecting holder 35.

[0049] In the above embodiment, the compressor 11 of the gas turbine 1 is exemplified as the axial flow rotary machine. However, the axial flow rotary machine may be any axial flow rotary machine as long as it has a stator vane segment, and may be, for example, the turbine 16 of the gas turbine 1 or a steam turbine.

[0050] "Additional Notes" The method of adjusting the curvature of the stator vane segment in the above embodiment can be understood, for example, as follows.

[0051] (1) The first embodiment of the method for adjusting the curvature of a stator vane segment is directed to an arc-shaped stator vane segment 31 in which a plurality of stator vanes 32 are attached to the outer periphery of an arc-shaped inner connecting member 35 in a line in the circumferential direction Dc. This curvature adjustment method includes a jig preparation step S3 of preparing a curvature adjustment jig 40 having a first end 42 a, a second end 42 b, and a distance adjustment mechanism 50 capable of changing the distance between the first end 42 a and the second end 42 b; and a step of fixing the first end 42 a of the curvature adjustment jig 40 to a first position 36 a of the inner connecting member 35 in a state in which the distance adjustment mechanism 50 of the curvature adjustment jig 40 is disposed on the inner peripheral side of the inner connecting member 35 of the stator vane segment 31, and adjusting the distance between the first end 42 a and the second end 42 b. a jig attachment step S4 for fixing the second end 42b of the curvature adjustment jig 40 to a second position 36b of the inner connecting member 35 that is spaced apart from the first position 36a of the inner connecting member 35 in the circumferential direction Dc; and a curvature adjustment step S5 for operating the distance adjustment mechanism after the jig attachment step S4 to change the distance between the first end 42a and the second end 42b of the curvature adjustment jig 40 so that the curvature of the outer peripheral edge of the arc-shaped stator vane segment 31 becomes a desired curvature.

[0052] In this embodiment, at the stage where the curvature of the stator vane segment 31 is adjusted using the curvature adjustment jig 40, the distance adjustment mechanism 50 of the curvature adjustment jig 40 is located on the inner circumferential side of the stator vane segment 31. Therefore, the stator vane segment 31 to which the curvature adjustment jig 40 is attached can be attached to the inner circumferential side of the stator vane retaining ring 21 without the curvature adjustment jig 40 interfering with the stator vane retaining ring 21. That is, in this embodiment, the stator vane segment 31 can be attached to the inner circumferential side of the stator vane retaining ring 21 in a state in which the curvature of the stator vane segment 31 is a predetermined curvature. Therefore, in this embodiment, the stator vane segment 31 can be easily attached to the inner circumferential side of the stator vane retaining ring 21.

[0053] (2) In a second aspect, a method for adjusting the curvature of a stator vane segment includes the steps of: In the curvature adjustment method for the stator vane segment 31 in the first aspect, the curvature adjustment jig 40 includes a first seat 41a including the first end 42a, a second seat 41b including the second end 42b, a first fixing portion 46a capable of fixing the first end 42a to the first position 36a of the inner connecting member 35, a second fixing portion 46b capable of fixing the second end 42b to the second position 36b of the inner connecting member 35, and the distance adjustment mechanism 50. The distance adjustment mechanism 50 includes a trunk portion 51, a first bar 53a extending from the trunk portion 51 to a first side Dd1 of both sides in a distance adjustment direction Dd in a distance adjustable manner, and a second bar 53b extending from the trunk portion 51 to a second side Dd2 opposite to the first side Dd1 in the distance adjustment direction Dd in a distance adjustable manner. The first pedestal 41a is attached to the first side Dd1 of the first bar 53a so as to be swingable about an axis extending in a direction perpendicular to the distance adjustment direction Dd. The second pedestal 41b is attached to the second side Dd2 of the second bar 53b so as to be swingable about an axis extending in a direction perpendicular to the distance adjustment direction Dd.

[0054] (3) In a third aspect, the method for adjusting the curvature of the stator vane segment includes the steps of: In the curvature adjusting method for the stator vane segment 31 in the second embodiment, a first female thread 52a extending in the distance adjustment direction Dd is formed on the first side Dd1 of the body portion 51, and a second female thread 52b extending in the distance adjustment direction Dd is formed on the second side Dd2 of the body portion 51. The second female thread 52b is a reverse thread with respect to the first female thread 52a. A first male thread 54a screwed into the first female thread 52a is formed on the second side Dd2 of the first bar material 53a. A second male thread 54b screwed into the second female thread 52b is formed on the first side Dd1 of the second bar material 53b.

[0055] The method for manufacturing the stationary body of the axial flow rotating machine in the above embodiment can be understood as follows, for example. (4) A method for manufacturing a stationary body of an axial flow rotating machine according to a fourth aspect includes the steps of: The method for adjusting the curvature of the stator vane segment 31 according to any one of the first to third embodiments is performed. Furthermore, the method includes a component preparation step S1 for preparing the stator vane segment 31 and a stator vane retaining ring 21 having an arc shape and to which the stator vane segment 31 is attached on its inner circumferential side, a stator vane segment attachment step S6 for attaching the stator vane segment 31, to which the curvature adjustment jig 40 is attached, to the inner circumferential side of the stator vane retaining ring 21 after the curvature adjustment step S5, and a jig removal step S7 for removing the curvature adjustment jig 40 from the stator vane segment 31 after the stator vane segment attachment step S6.

[0056] In this embodiment, the stator blade segment 31 can be easily attached to the inner circumferential side of the stator blade retaining ring 21. Therefore, in this embodiment, the manufacturing efficiency of the stationary body can be improved.

[0057] (5) In a fifth aspect, a method for manufacturing a stationary body of an axial flow rotating machine includes the steps of: In the fourth aspect of the stationary body manufacturing method for an axial flow rotating machine, in the curvature adjustment process S5, the distance between the first end 42a and the second end 42b of the curvature adjustment jig 40 is changed so that the curvature of the outer peripheral edge of the stator vane segment 31 becomes the same as the curvature of the inner peripheral edge of the stator vane retaining ring 21.

[0058] The curvature adjusting jig for the stator vane segment in the above embodiment can be understood, for example, as follows. (6) The curvature adjustment jig for a stator vane segment in the sixth embodiment is intended for a stator vane segment 31 in which a plurality of stator vanes 32 are attached to the outer periphery of an arc-shaped inner connecting member 35 so as to be aligned in the circumferential direction Dc. The curvature adjustment jig 40 has a first seat 41a including a first end 42a, a second seat 41b including a second end 42b, a first fixing portion 46a capable of fixing the first end 42a to a first position 36a of the inner connecting member 35, a second fixing portion 46b capable of fixing the second end 42b to a second position 36b of the inner connecting member 35 spaced apart from the first position 36a in the circumferential direction Dc, and a distance adjustment mechanism 50 capable of changing the distance between the first end 42a and the second end 42b. The distance adjustment mechanism 50 is located on the inner peripheral side of the inner connecting member 35 with the first end 42a fixed to the first position 36a of the inner connecting member 35 and the second end 42b fixed to the second position 36b of the inner connecting member 35. The distance adjustment mechanism 50 has a body 51, a first bar 53a extending from the body 51 to a first side Dd1 of both sides in a distance adjustment direction Dd so as to be distance adjustable, and a second bar 53b extending from the body 51 to a second side Dd2 opposite to the first side Dd1 in the distance adjustment direction Dd so as to be distance adjustable. The first pedestal 41a is attached to a portion of the first side Dd1 of the first bar 53a so as to be swingable about an axis extending in a direction perpendicular to the distance adjustment direction Dd. The second pedestal 41b is attached to a portion of the second side Dd2 of the second bar 53b so as to be swingable about an axis extending in a direction perpendicular to the distance adjustment direction Dd.

[0059] When attaching the curvature adjustment jig 40 of this embodiment to the stator vane segment 31, a first end 42a of the first pedestal 41a is fixed to a first position 36a of the inner connecting member 35 of the stator vane segment 31, and a second end 42b of the second pedestal 41b is fixed to a second position 36b of the inner connecting member 35 of the stator vane segment 31. In this state, the distance adjustment mechanism 50 of the curvature adjustment jig 40 is located on the inner circumferential side of the stator vane segment 31. For this reason, the curvature adjustment jig 40 does not interfere with the stator vane retaining ring 21, and the stator vane segment 31 to which the curvature adjustment jig 40 is attached can be attached to the inner circumferential side of the stator vane retaining ring 21.

[0060] (7) In a seventh aspect, the curvature adjustment jig for the stator vane segment is In the curvature adjustment jig for a stator vane segment in the sixth embodiment, a first female thread 52a extending in the distance adjustment direction Dd is formed on the first side Dd1 of the body portion 51, and a second female thread 52b extending in the distance adjustment direction Dd is formed on the second side Dd2. The second female thread 52b is a reverse thread with respect to the first female thread 52a. A first male thread 54a screwed into the first female thread 52a is formed on the second side Dd2 of the first bar material 53a. A second male thread 54b screwed into the second female thread 52b is formed on the first side Dd1 of the second bar material 53b. [Explanation of symbols]

[0061] 1: Gas turbine 2: Gas turbine rotor 3: Intermediate casing 11: Compressor 12: Compressor rotor 12s: rotor shaft 12b: Moving blade row 13: Compressor casing 14: Stator blade row 15: Combustor 16: Turbine 17: Turbine rotor 17s: rotor shaft 17b: Moving blade row 18: Turbine casing 19: Stator blade row 20: Casing body 21: Stator blade retaining ring 21u: Upper stator blade retaining ring 21d: Lower half stator blade retaining ring 22: Ring groove 30: Stator blade ring 31: Stator vane segment 32: Static wing 33: Wing body 34i: Inner shroud 34o: Outer shroud 35: Connection holder (or inner connection member) 36a: First position 36b:Second position 37a: First screw hole 37b: Second screw hole 39: Connecting band (or outer connecting member) 40: Curvature adjustment jig 41a: First pedestal 41b:Second pedestal 42a: First end 42b: Second end 43: Holder contact plate part 44: Buckle connection plate 45: Pin 46a: First fixed part 46b:Second fixed part 47: Bolt 50: Turnbuckle (or distance adjustment mechanism) 51: Torso 52a: First female screw 52b: Second female thread 53a: First bar material 53b:Second bar material 54a: First male thread 54b: Second male thread Ar: Axis line Da: Axial direction Dau: Axis upstream side Dad: Downstream of axis Dc: Circumferential direction Dr: Radial direction Dri: Radial inner direction Dro: Radial outer side Dd: Distance adjustment direction Dd1: First side Dd2: Second side

Claims

1. A method for adjusting the curvature of an arc-shaped stator vane segment in which a plurality of stator vanes are attached in a circumferentially arranged manner to an outer circumferential side of an arc-shaped inner connecting member, comprising: a jig preparation process for preparing a curvature adjustment jig having a first end, a second end, and a distance adjustment mechanism capable of changing a distance between the first end and the second end; a jig attachment process of fixing the first end of the curvature adjustment jig to a first position of the inner connecting member and fixing the second end of the curvature adjustment jig to a second position of the inner connecting member that is spaced apart from the first position of the inner connecting member in the circumferential direction, with the distance adjustment mechanism of the curvature adjustment jig being disposed on an inner circumferential side of the inner connecting member of the stator vane segment; a curvature adjusting step of operating the distance adjustment mechanism after the jig mounting step to change the distance between the first end and the second end of the curvature adjustment jig so that the curvature of an outer peripheral edge of the arc-shaped stator vane segment becomes a target curvature; Run the curvature adjustment jig includes a first base including the first end, a second base including the second end, a first fixing portion capable of fixing the first end to the first position of the inner connecting member, a second fixing portion capable of fixing the second end to the second position of the inner connecting member, and the distance adjustment mechanism, the distance adjustment mechanism includes a trunk portion, a first bar extending from the trunk portion to a first side of both sides in a distance adjustment direction in a manner adjustable in distance, and a second bar extending from the trunk portion to a second side opposite the first side in the distance adjustment direction in a manner adjustable in distance, The first base is attached to the first side portion of the first bar so as to be swingable around an axis extending in a direction perpendicular to the distance adjustment direction, The second base is attached to the second side portion of the second bar so as to be swingable around an axis extending in a direction perpendicular to the distance adjustment direction. A method for adjusting the curvature of a stator vane segment.

2. The method for adjusting the curvature of a stator vane segment according to claim 1, A first female thread extending in the distance adjustment direction is formed in the first side portion of the body portion, and a second female thread extending in the distance adjustment direction is formed in the second side portion of the body portion, The second female thread is a reverse thread relative to the first female thread, A first male thread is formed on the second side portion of the first bar material and is screwed into the first female thread, A second male screw is formed on the first side of the second bar material and is screwed into the second female screw. A method for adjusting the curvature of a stator vane segment.

3. Carrying out the method for adjusting the curvature of a stator vane segment according to claim 1 or 2, a component preparation process for preparing the stator vane segment and a stator vane retaining ring having an arc shape and to which the stator vane segment is attached on an inner circumferential side of the stator vane retaining ring; a stator vane segment mounting process of mounting the stator vane segment, to which the curvature adjusting jig has been attached after the curvature adjusting process, to an inner peripheral side of the stator vane retaining ring; a jig removing step of removing the curvature adjusting jig from the stator vane segment after the stator vane segment mounting step; A method for manufacturing a stationary body of an axial flow rotating machine, comprising:

4. In the method for manufacturing a stationary body of an axial flow rotating machine according to claim 3, in the curvature adjusting step, a distance between the first end and the second end of the curvature adjusting jig is changed so that a curvature of an outer peripheral edge of the stator blade segment becomes equal to a curvature of an inner peripheral edge of the stator blade retaining ring. A method for manufacturing a stationary body of an axial flow rotating machine.

5. In a curvature adjustment jig for a stator vane segment, a plurality of stator vanes are attached in a circumferentially arranged manner to an outer circumferential side of an arc-shaped inner connecting member, the inner connecting member has a first base including a first end, a second base including a second end, a first fixing portion capable of fixing the first end to a first position of the inner connecting member, a second fixing portion capable of fixing the second end to a second position of the inner connecting member spaced apart from the first position in the circumferential direction, and a distance adjustment mechanism capable of changing a distance between the first end and the second end, the distance adjustment mechanism is located on an inner peripheral side of the inner connecting member with the first end fixed to the first position of the inner connecting member and the second end fixed to the second position of the inner connecting member, the distance adjustment mechanism includes a trunk portion, a first bar extending from the trunk portion to a first side of both sides in a distance adjustment direction in a manner adjustable in distance, and a second bar extending from the trunk portion to a second side opposite the first side in the distance adjustment direction in a manner adjustable in distance, The first base is attached to the first side portion of the first bar so as to be swingable around an axis extending in a direction perpendicular to the distance adjustment direction, The second base is attached to the second side portion of the second bar so as to be swingable around an axis extending in a direction perpendicular to the distance adjustment direction. Curvature adjustment jig for stator vane segments.

6. In the curvature adjustment jig for a stator vane segment according to claim 5, A first female thread extending in the distance adjustment direction is formed in the first side portion of the body portion, and a second female thread extending in the distance adjustment direction is formed in the second side portion of the body portion, The second female thread is a reverse thread relative to the first female thread, A first male thread is formed on the second side portion of the first bar material and is screwed into the first female thread, A second male screw is formed on the first side of the second bar material and is screwed into the second female screw. Curvature adjustment jig for stator vane segments.

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