Method for adjusting curvature of vane segment, method for manufacturing stationary body of axial rotation machine, and jig for adjusting curvature of vane segment

Abstract

The curvature adjustment method of the present application is for a plurality of stator blades arranged in a circumferential direction and mounted to a circular-arc-shaped stator blade segment on an outer peripheral side of an inner-side connecting member. In the curvature adjustment method, the following steps are performed: 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 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-side connecting member and fixing the second end at a second position of the inner-side connecting member with the distance adjustment mechanism arranged on an inner peripheral side of the inner-side connecting member; and a curvature adjustment 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 in such a manner that a curvature of the circular-arc-shaped stator blade segment reaches a target curvature.

Description

Technical Field

[0001] This invention relates to a curvature adjustment technique for stationary blade segments in axial-flow rotating machinery.

[0002] This application claims priority based on Japanese Patent Application No. 2021-053628, filed in Japan on March 26, 2021, the contents of which are incorporated herein by reference. Background Technology

[0003] Axial-flow rotating machinery includes: a rotor that rotates about an axis; multiple stationary blade segments arranged circumferentially relative to the axis; and a stationary blade retaining ring extending circumferentially and retaining the multiple stationary blade segments. Each of the multiple stationary blade segments has multiple stationary blades and an inner connecting member that is arc-shaped relative to the axis. The multiple stationary blades are arranged circumferentially and mounted on the outer periphery of the inner connecting member.

[0004] Patent Document 1 discloses a method for disassembling a steam turbine, which is a type of axial-flow rotating machinery. This steam turbine has an upper half and a lower half of a blade ring as multiple stationary blade segments. Furthermore, the steam turbine has an upper half and a lower half of an internal chamber as multiple stationary blade retaining rings. The two ends of the upper half of the blade ring are connected circumferentially to the two ends of the lower half of the blade ring. The two ends of the upper half of the internal chamber are connected circumferentially to the two ends of the lower half of the internal chamber. The upper half of the blade ring is disposed on the inner circumferential side of the upper half of the internal chamber. The lower half of the blade ring is disposed on the inner circumferential side of the lower half of the internal chamber.

[0005] In the method for disassembling a steam turbine described in Patent Document 1, firstly, the upper half of the inner chamber is disassembled from the lower half of the inner chamber. Next, a circular retaining device is installed on the outer circumferential side of the lower half of the blade ring and at both circumferential ends of the lower half of the blade ring. This circular retaining device connects the outer circumferential side of the lower half of the blade ring and its two circumferential ends to the inner circumferential side of the lower half of the inner chamber. Then, the upper half of the blade ring is disassembled from the lower half of the blade ring to which the circular retaining device is installed. In the method for disassembling a steam turbine described in Patent Document 1, as described above, the outer circumferential side of the lower half of the blade ring and its two circumferential ends to the inner circumferential side of the lower half of the inner chamber are connected by the circular retaining device. Therefore, in the method for disassembling a steam turbine described in Patent Document 1, even if the upper half of the blade ring is disassembled from the lower half of the blade ring, the deformation of the two ends of the lower half of the blade ring in the circumferential direction towards the inner circumferential side can be suppressed, and the roundness of the lower half of the blade ring can be maintained.

[0006] Existing technical documents

[0007] Patent documents

[0008] Patent Document 1: Japanese Patent Application Publication No. 2012-013046 Summary of the Invention

[0009] The problem that the invention aims to solve

[0010] In the method described in Patent Document 1, as mentioned above, by connecting the outer circumferential side of the lower half of the blade ring and the two circumferential ends of the lower half of the blade ring to the inner circumferential side of the lower half of the internal housing by a circular retaining device, deformation of the two circumferential ends of the lower half of the blade ring towards the inner circumferential side is suppressed. Therefore, when the lower half of the blade ring is removed from the lower half of the internal housing, the circularity of the lower half of the blade ring cannot be maintained; in other words, the curvature of the lower half of the blade ring cannot be maintained. Therefore, in the method described in Patent Document 1, when the lower half of the blade ring, which is a stationary blade segment, is installed in the lower half of the internal housing, which is a stationary blade retaining ring, there is a high probability that the curvature of the lower half of the blade ring, which is a stationary blade segment, will not reach the predetermined curvature. Thus, when the curvature of the stationary blade segment does not reach the predetermined curvature, it is difficult to install the stationary blade segment on the inner circumferential side of the stationary blade retaining ring.

[0011] Therefore, the object of the present invention is to provide a technique that enables easy installation of a stationary blade segment onto the inner circumference of a stationary blade retaining ring.

[0012] means for solving technical problems

[0013] In one method for adjusting the curvature of a stationary blade segment to achieve the aforementioned objective, the object is an arc-shaped stationary blade segment in which multiple stationary blades are arranged circumferentially and installed on the outer periphery of an arc-shaped inner connecting component.

[0014] In this curvature adjustment method, the following steps are performed: a fixture preparation step, in which a curvature adjustment fixture 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 is prepared; a fixture installation step, in which the distance adjustment mechanism of the curvature adjustment fixture is arranged on the inner circumferential side of the inner connecting member in the stationary blade segment, the first end of the curvature adjustment fixture is fixed at a first position of the inner connecting member, and the second end of the curvature adjustment fixture is fixed at a second position of the inner connecting member spaced apart circumferentially from the first position of the inner connecting member; and a curvature adjustment step, in which the distance adjustment mechanism is operated after the fixture installation step to change the distance between the first end and the second end of the curvature adjustment fixture in such a way that the curvature of the outer circumferential edge of the arc-shaped stationary blade segment becomes the target curvature.

[0015] In this method, during the stage of adjusting the curvature of the stationary blade segment using the curvature adjustment fixture, the distance adjustment mechanism of the curvature adjustment fixture is located on the inner circumference of the stationary blade segment. Therefore, the stationary blade segment with the curvature adjustment fixture mounted on it can be installed on the inner circumference of the stationary blade retaining ring without the curvature adjustment fixture interfering with the stationary blade retaining ring. That is, in this method, the stationary blade segment can be installed on the inner circumference of the stationary blade retaining ring when the curvature of the stationary blade segment reaches a predetermined curvature. Therefore, in this method, the stationary blade segment can be easily installed on the inner circumference of the stationary blade retaining ring.

[0016] As one way to achieve the stated purpose, the method for manufacturing the stationary body of an axial-flow rotating machine performs a curvature adjustment method for the stationary blade segment in the stated method.

[0017] The following steps are then performed: a component preparation step, in which the stationary blade segment and a stationary blade retaining ring that is arc-shaped and has the stationary blade segment mounted on its inner circumference; a stationary blade segment installation step, in which, after the curvature adjustment step, the stationary blade segment with the curvature adjustment fixture mounted is installed on the inner circumference of the stationary blade retaining ring; and a fixture removal step, in which, after the stationary blade segment installation step, the curvature adjustment fixture is removed from the stationary blade segment.

[0018] In this method, the stationary blade segment can be easily installed on the inner circumference of the stationary blade retaining ring.

[0019] Therefore, this method can improve the manufacturing efficiency of stationary bodies.

[0020] In a curvature adjustment fixture for a stationary blade segment as one way to achieve the aforementioned purpose, the stationary blade segment, in which multiple stationary blades are arranged circumferentially and mounted on the outer periphery of an arc-shaped inner connecting member, is taken as the object.

[0021] The curvature adjustment fixture includes: a first base including a first end; a second base including a second end; a first fixing part capable of fixing the first end at a first position of the inner connecting member; a second fixing part capable of fixing the second end at a second position of the inner connecting member spaced apart circumferentially from the first position; and a distance adjustment mechanism capable of changing the distance between the first end and the second end. The distance adjustment mechanism is located on the inner circumference of the inner connecting member when the first end is fixed at the first position of the inner connecting member and the second end is fixed at the second position of the inner connecting member. The distance adjustment mechanism includes: a main body; a first rod extending from the main body to a first side of two sides in the distance adjustment direction with an adjustable distance; and a second rod extending from the main body to a second side opposite to the first side in the distance adjustment direction with an adjustable distance. The first base is mounted on the first side portion of the first rod in a manner capable of swinging about an axis extending in a direction perpendicular to the distance adjustment direction. On the second side portion of the second bar, a second base is mounted in such a way that it can swing about an axis extending in a direction perpendicular to the distance adjustment direction.

[0022] When the curvature adjustment fixture of this method is installed on the stationary blade segment, the first end of the first base is fixed at the first position of the inner connecting member in the stationary blade segment, and the second end of the second base is fixed at the second position of the inner connecting member in the stationary blade segment. In this state, the distance adjustment mechanism of the curvature adjustment fixture is located on the inner circumference of the stationary blade segment. Therefore, the stationary blade segment with the curvature adjustment fixture installed can be installed on the inner circumference of the stationary blade retaining ring without interfering with the stationary blade retaining ring.

[0023] Invention Effects

[0024] In one aspect of the invention, the stationary blade segment can be easily installed on the inner circumferential side of the stationary blade retaining ring. Attached Figure Description

[0025] Figure 1 This is a cross-sectional side view of the main part of a gas turbine in one embodiment of the present invention.

[0026] Figure 2 yes Figure 1 Enlarged view of Part II.

[0027] Figure 3 yes Figure 2 Sectional view along line III-III.

[0028] Figure 4 This is a perspective view of a stationary blade segment in one embodiment of the present invention.

[0029] Figure 5 This is a front view of the stationary blade segment and curvature adjustment fixture in one embodiment of the present invention.

[0030] Figure 6 yes Figure 5 Sectional view along line VI-VI.

[0031] Figure 7 This is a flowchart illustrating the steps of a method for manufacturing a stationary body according to one embodiment of the present invention.

[0032] Figure 8 This is an explanatory diagram illustrating the manufacturing process of a stationary body in one embodiment of the present invention. Detailed Implementation

[0033] The following is for reference. Figures 1 to 8 An embodiment of the present invention will be described in detail below.

[0034] Axial-flow rotating machinery

[0035] First, refer to Figures 1-4 This section describes gas turbines, including axial-flow rotating machinery.

[0036] like Figure 1 As shown, the gas turbine 1 includes: a compressor 11 that compresses external air to generate compressed air; a combustor 15 that burns 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.

[0037] The compressor 11 is a type of axial-flow rotating machinery. The compressor 11 has: a compressor rotor 12 that rotates about an axis Ar; a compressor housing 13 covering the compressor rotor 12; and multiple rows of stationary blades 14. The turbine 16 is also a type of axial-flow rotating machinery. The turbine 16 has: a turbine rotor 17 that rotates about an axis Ar; a turbine housing 18 covering the turbine rotor 17; and multiple rows of stationary blades 19.

[0038] The compressor 11 is located on the upstream side Dau of the axis Ar, relative to the turbine 16, in the axial direction Da extending from the axis Ar. The compressor rotor 12 and the turbine rotor 17 are located on the same axis Ar and are connected to each other to form the gas turbine rotor 2. A generator rotor, for example, is connected to this gas turbine rotor 2.

[0039] The compressor rotor 12 has a rotor shaft 12s extending along the axial direction Da with the axis Ar as its center and a plurality of moving blade rows 12b. The plurality of moving blade rows 12b are arranged along the axial direction Da and are disposed on the rotor shaft 12s. Each moving blade row 12b has a plurality of moving blades arranged along the circumferential direction Dc relative to the axis Ar. Any one of a plurality of stationary blade rows 14 is disposed on the downstream side Dad of the plurality of moving blade rows 12b. The plurality of stationary blade rows 14 are disposed on the inner circumferential side of the compressor housing 13.

[0040] The turbine rotor 17 has a rotor shaft 17s extending along the axial direction Da with the axis Ar as its center and a plurality of moving blade rows 17b. The plurality of moving blade rows 17b are arranged along the axial direction Da and disposed on the rotor shaft 17s. Each moving blade row 17b has a plurality of moving blades arranged along the circumferential direction Dc relative to the axis Ar. Any one of a plurality of stationary blade rows 19 is disposed on the upstream side Dau of the axial direction of the plurality of moving blade rows 17b. The plurality of stationary blade rows 19 are disposed on the inner circumferential side of the turbine housing 18.

[0041] The gas turbine 1 also includes an intermediate housing 3. The compressor housing 13, the intermediate housing 3, and the turbine housing 18 are arranged sequentially along the aforementioned axial direction Da and are connected to each other. The burner 15 is disposed in the intermediate housing 3.

[0042] like Figure 2 and Figure 3 As shown, the compressor housing 13 has a cylindrical housing body 20 centered on axis Ar and a stationary vane retaining ring 21 disposed on the inner circumferential side of the housing body 20. For ease of assembly, the housing body 20 has an upper housing and a lower housing. The upper housing forms the upper half of the housing body 20. The lower housing forms the lower half of the housing body 20. The stationary vane retaining ring 21 is cylindrical centered on axis Ar. For ease of assembly, the stationary vane retaining ring 21 has an upper stationary vane retaining ring 21u and a lower stationary vane retaining ring 21d. The upper stationary vane retaining ring 21u forms the upper half of the stationary vane retaining ring 21. The lower stationary vane retaining ring 21d forms the lower half of the stationary vane retaining ring 21.

[0043] On the stationary blade retaining ring 21, a plurality of annular grooves 22 are formed, which are recessed from the inner circumferential surface toward the radially outer side relative to the axis Ar and are annular with the axis Ar as the center. The plurality of annular grooves 22 are arranged along the axial direction Da.

[0044] The compressor 11 has a plurality of stationary vane rings 30. The plurality of stationary vane rings 30 are arranged along the axial direction Da. Each stationary vane ring 30 has any one of the aforementioned plurality of stationary vane rows 14. The outer peripheral portion of each stationary vane ring 30 is embedded in any one of the plurality of annular grooves 22. For ease of assembly, each stationary vane ring 30 can be divided into a plurality of stationary vane segments 31 along the circumferential direction Dc. In this embodiment, one stationary vane ring 30 can be divided into eight stationary vane segments 31. Of the eight stationary vane segments 31, the outer peripheral portions of four stationary vane segments 31 are embedded in an annular groove 22 of the upper half stationary vane retaining ring 21u. The outer peripheral portions of the remaining four stationary vane segments 31 are embedded in an annular groove 22 of the lower half stationary vane retaining ring 21d. In addition, here, a stationary blade ring 30 is composed of 8 stationary blade segments 31, but it can also be composed of less than 8, specifically 6 or 4 stationary blade segments, or more than 8, such as 10 or 12 stationary blade segments.

[0045] The stationary body of the compressor 11 in this embodiment has an upper stationary blade retaining ring 21u, a lower stationary blade retaining ring 21d, and a plurality of stationary blade segments 31 mounted thereon.

[0046] like Figure 4 As shown, a stationary blade segment 31 is arc-shaped. This stationary blade segment 31 has multiple stationary blades 32, a connecting frame 35 as an inner connecting member, and a connecting band 39 as an outer connecting member.

[0047] Multiple stationary blades 32 are arranged circumferentially Dc between the connecting frame 35 and the connecting band 39. Each stationary blade 32 has a blade body 33 extending radially Dr, an inner shield 34i disposed on the radially inner side Dri of the blade body 33, and an outer shield 34o disposed on the radially outer side Dro of the blade body 33. The connecting frame 35 is arc-shaped. The inner shield 34i of each stationary blade 32 is mounted on the connecting frame 35. The connecting band 39 is also arc-shaped. The outer shields 34o of each stationary blade 32 are connected to the connecting band 39, for example, by welding or screws. Therefore, the connecting band 39 connects the outer shields 34o of each stationary blade 32 to each other. The portion of the stationary blade segment 31 embedded in the annular groove 22 of the stationary blade retaining ring 21 has the connecting band 39 and the outer shields 34o of each stationary blade 32.

[0048] When the curvature of the outer peripheral portion of the stationary blade segment 31 is inconsistent with the curvature of the annular groove 22, it is difficult to embed the outer peripheral portion of the stationary blade segment 31 into the annular groove 22. Assuming that even if the curvature of the connecting frame 35 and the connecting strip 39 before assembly are the designed curvatures, these curvatures may change during the assembly of the stationary blade segment 31. For example, if the connecting strip 39 is welded to the outer shroud 34o of each stationary blade 32, the curvature in the outer peripheral portion of the stationary blade segment 31 decreases. Therefore, the following will explain the method for adjusting the curvature of the stationary blade segment 31.

[0049] "Methods for adjusting the curvature of stationary blade segments, methods for manufacturing stationary bodies in axial-flow rotating machinery, and fixtures for adjusting the curvature of stationary blade segments."

[0050] refer to Figures 5-8 The paper describes the method for adjusting the curvature of stationary blade segments, the method for manufacturing stationary bodies in axial-flow rotating machinery, and the fixture for adjusting the curvature of stationary blade segments.

[0051] First, refer to Figure 5 and Figure 6 The curvature adjustment fixture 40 used in the curvature adjustment method of the stationary blade segment is explained.

[0052] The curvature adjustment fixture 40 has a first base 41a, a second base 41b, a first fixing part 46a, a second fixing part 46b, and a turnbuckle 50 as a distance adjustment mechanism.

[0053] The screw clip 50 has a main body 51, a first rod 53a, and a second rod 53b.

[0054] On the main body 51, a first internal thread 52a extending along the distance adjustment direction Dd is formed on the first side Dd1 of the two sides Dd. Furthermore, on the main body 51, a second internal thread 52b extending along the distance adjustment direction Dd is formed on the second side Dd2 of the two sides Dd. The second internal thread 52b is a reverse thread relative to the first internal thread 52a. That is, if the first internal thread 52a is a right-hand thread, the second internal thread 52b is a left-hand thread. Both the first bar 53a and the second bar 53b are bars extending along the distance adjustment direction Dd. A first external thread 54a, screwed into the first internal thread 52a, is formed on the second side Dd2 of the first bar 53a. A second external thread 54b, screwed into the second internal thread 52b, is formed on the first side Dd1 of the second bar 53b.

[0055] Both the first base 41a and the second base 41b have a bracket contact plate portion 43 that can contact the inner peripheral side of the connecting frame 35 and a buckle connecting plate portion 44 that can be connected to the screw fastener 50. The buckle connecting plate portion 44 extends from the edge of the bracket contact plate portion 43 in a direction intersecting the bracket contact plate portion 43. A portion of the surface of the bracket contact plate portion 43 in the first base 41a forms a first end 42a. And a portion of the surface of the bracket contact plate portion 43 in the second base 41b forms a second end 42b. The buckle connecting plate portion 44 of the first base 41a is mounted on the first side Dd1 portion of the first rod 53a via a pin 45. Therefore, the first base 41a can swing relative to the first rod 53a about an axis extending in a direction perpendicular to the distance adjustment direction Dd. The buckle connecting plate portion 44 of the second base 41b is mounted on the second side Dd2 portion of the second rod 53b via a pin 45. Therefore, the second base 41b can swing relative to the second bar 53b about an axis extending in a direction perpendicular to the distance adjustment direction Dd.

[0056] Both the first fixing part 46a and the second fixing part 46b have bolts 47. On the inner circumferential side of the connecting frame 35, the portion on one side of the circumferential direction Dc is the first position 36a, and the portion on the other side of the circumferential direction Dc is the second position 36b. Therefore, the second position 36b is a position spaced apart from the first position 36a along the circumferential direction Dc. On the connecting frame 35, a first screw hole 37a and a second screw hole 37b are formed that are recessed from the inner circumferential side towards the radially outward direction Dro. The first screw hole 37a is formed near the aforementioned first position 36a, and the second screw hole 37b is formed near the aforementioned second position 36b. When fixing the first end 42a of the curvature adjustment clamp 40 to the first position 36a of the connecting frame 35, firstly, the first end 42a of the first base 41a is brought into contact with the first position 36a of the connecting frame 35. Then, via the bracket contact plate portion 43 of the first base 41a, the bolts 47 of the first fixing part 46a are screwed into the first screw hole 37a of the connecting frame 35. As a result, the first end 42a of the curvature adjustment clamp 40 is fixed to the first position 36a of the connecting frame 35. Furthermore, when fixing the second end 42b of the curvature adjustment clamp 40 to the second position 36b of the connecting frame 35, firstly, the second end 42b of the second base 41b is brought into contact with the second position 36b of the connecting frame 35. Next, the bolt 47 of the second fixing part 46b is screwed into the second screw hole 37b of the connecting frame 35 via the bracket contact plate portion 43 of the second base 41b. As a result, the second end 42b of the curvature adjustment clamp 40 is fixed to the second position 36b of the connecting frame 35.

[0057] If the main body 51 of the screw clip 50 is rotated about an axis extending along the distance adjustment direction Dd, the first rod 53a moves relative to the main body 51 towards one of the first side Dd1 and the second side Dd2 in the distance adjustment direction Dd, and the second rod 53b moves relative to the other side. Therefore, in the curvature adjustment fixture 40 described above, by rotating the main body 51 of the screw clip 50, the distance between the first end 42a in the first base 41a and the second end 42b in the second base 41b can be changed.

[0058] Next, according to Figure 7 The flowchart shown illustrates the method for adjusting the curvature of the stationary blade segment 31 and the method for manufacturing the stationary body of an axial-flow rotating machine.

[0059] First, component preparation step S1 is performed. In this component preparation step S1, components constituting the stationary body of the compressor 11, which is an axial-flow rotating machine, are prepared. As components constituting the stationary body, there are an upper half-stationary blade retaining ring 21u, a lower half-stationary blade retaining ring 21d, and a plurality of stationary blade segments 31 mounted on them.

[0060] Next, the fixture preparation step S3 is performed. In this fixture preparation step S3, the curvature adjustment fixture 40 described above is prepared.

[0061] Next, the fixture installation process S4 is performed. In this fixture installation process S4, the curvature adjustment fixture 40 is installed on the connecting frame 35 of the stationary blade segment 31. Specifically, firstly, the screw thread 50 of the curvature adjustment fixture 40 is positioned on the inner circumference of the stationary blade segment 31. Next, as described above, the first end 42a of the first base 41a is brought into contact with the first position 36a of the connecting frame 35. Then, the bolt 47 of the first fixing part 46a is screwed into the first screw hole 37a of the connecting frame 35 via the bracket contact plate portion 43 of the first base 41a. As a result, the first end 42a of the curvature adjustment fixture 40 is fixed to the first position 36a of the connecting frame 35. Then, the second end 42b of the second base 41b is brought into contact with the second position 36b of the connecting frame 35. Then, the bolt 47 of the second fixing part 46b is screwed into the second screw hole 37b of the connecting frame 35 via the bracket contact plate portion 43 of the second base 41b. As a result, the second end 42b of the curvature adjustment fixture 40 is fixed to the second position 36b of the connecting frame 35. Thus, the fixture installation process S4 is completed.

[0062] Next, the curvature adjustment process S5 is performed. In this curvature adjustment process S5, the main body 51 of the screw clip 50 is rotated to change the distance between the first end 42a and the second end 42b of the curvature adjustment fixture 40 so that the curvature of the outer peripheral edge of the stationary blade segment 31 reaches the target curvature. Here, the target curvature refers to the curvature of the inner peripheral edge of the stationary blade retaining ring 21, specifically, the curvature of the bottom surface of the annular groove 22. Therefore, when the curvature of the outer peripheral edge of the stationary blade segment 31 is set as the target curvature, for example, firstly, in the bottom surface of the annular groove 22, the straight-line distance between the end contact position on one side of the circumferential direction Dc of the stationary blade segment 31 and the end contact position on the other side of the circumferential direction Dc of the stationary blade segment 31 is measured, and this straight-line distance is set as the target distance. Then, the main body 51 of the screw buckle 50 is rotated in such a way that the straight distance between the end of one side of the circumferential Dc in the outer peripheral edge of the stationary blade segment 31 and the end of the other side of the circumferential Dc in the outer peripheral edge of the stationary blade segment 31 is taken as the target distance.

[0063] In the curvature adjustment method S2 of the stationary blade segment 31, the above-mentioned fixture preparation step S3, fixture installation step S4, and curvature adjustment step S5 are performed. Alternatively, the fixture preparation step S3 can be performed before the fixture installation step S4, or it can be performed before the component preparation step S1.

[0064] Next, the stationary blade segment installation process S6 is performed. In this stationary blade segment installation process S6, as follows... Figure 8 As shown, after the curvature adjustment step S5, the stationary blade segment 31, on which the curvature adjustment fixture 40 is mounted, is installed on the inner circumferential side of the stationary blade retaining ring 21. At this time, the stationary blade segment 31 is positioned such that the edge of the outer circumferential side of the stationary blade segment 31 is located on the extension line of the circumferential direction Dc of the bottom surface of the annular groove 22. Then, the stationary blade segment 31 on which the curvature adjustment fixture 40 is mounted is moved along the circumferential direction Dc, and the outer circumferential portion of the stationary blade segment 31 is inserted into the annular groove 22. Then, when the outer circumferential portion of the stationary blade segment 31 is located at the target position Pt in the annular groove 22, the installation of the stationary blade segment 31 relative to the stationary blade retaining ring 21 is completed.

[0065] When the installation of the stationary blade segment 31 is completed, the clamp removal process S7 is performed. In this clamp removal process S7, the curvature adjustment clamp 40 is removed from the stationary blade segment 31.

[0066] When the installation of all stationary blade segments 31 relative to the annular groove 22 is completed, the stationary body is finished.

[0067] As described above, in this embodiment, during the stage of adjusting the curvature of the stationary blade segment 31 using the curvature adjustment clamp 40, the screw thread 50 of the curvature adjustment clamp 40 is located on the inner circumference of the stationary blade segment 31. Therefore, the stationary blade segment 31 with the curvature adjustment clamp 40 mounted on it can be installed on the inner circumference of the stationary blade retaining ring 21 without the curvature adjustment clamp 40 interfering with the stationary blade retaining ring 21. That is, in this embodiment, the stationary blade segment 31 can be installed on the inner circumference of the stationary blade retaining ring 21 when the curvature of the stationary blade segment 31 reaches a predetermined curvature. Therefore, in this embodiment, the stationary blade segment 31 can be easily installed on the inner circumference of the stationary blade retaining ring 21.

[0068] "Variations"

[0069] In the above embodiments, both the first fixing part 46a and the second fixing part 46b of the curvature adjustment clamp 40 have bolts 47. However, each fixing part can have any component as long as it can fix each base to the target position of the connecting frame 35. For example, it can also have a clamp that clamps a part of the connecting frame 35.

[0070] In the above embodiments, the compressor 11 of the gas turbine 1 is exemplified as an axial-flow rotating machine. However, the axial-flow rotating machine can be any axial-flow rotating machine as long as it has a stationary blade segment, for example, it can also be the turbine 16 of the gas turbine 1 or a steam turbine.

[0071] The embodiments of the present invention have been described in detail above, but the present invention is not limited to the above embodiments. Various additions, modifications, substitutions, and partial deletions can be made without departing from the scope of the patent claims and the conceptual ideas and spirit of the present invention derived from their equivalents.

[0072] Postscript

[0073] The curvature adjustment method of the stationary blade segment in the above embodiments is as follows.

[0074] (1) In the curvature adjustment method of the stationary blade segment in the first method, the arc-shaped stationary blade segment 31, in which multiple stationary blades 32 are arranged along the circumferential direction Dc and installed on the outer periphery of the arc-shaped inner connecting member 35, is taken as the object.

[0075] In this curvature adjustment method, the following steps are performed: Fixture preparation step S3, preparing a curvature adjustment fixture 40 having a first end 42a, a second end 42b, and a distance adjustment mechanism 50 capable of changing the distance between the first end 42a and the second end 42b; Fixture installation step S4, with the distance adjustment mechanism 50 of the curvature adjustment fixture 40 arranged on the inner circumferential side of the inner connecting member 35 in the stationary blade segment 31, fixing the curvature adjustment fixture 40 at the first position 36a of the inner connecting member 35. The first end 42a is used to fix the second end 42b of the curvature adjustment fixture 40 at the second position 36b of the inner connecting member 35, which is spaced apart from the first position 36a along the circumferential direction Dc; and the curvature adjustment process S5 is used after the fixture installation process S4 to operate the distance adjustment mechanism to change the distance between the first end 42a and the second end 42b of the curvature adjustment fixture 40 in such a way that the curvature of the outer peripheral edge of the arc-shaped stationary blade segment 31 reaches the target curvature.

[0076] In this method, during the stage of adjusting the curvature of the stationary blade segment 31 using the curvature adjustment fixture 40, the distance adjustment mechanism 50 of the curvature adjustment fixture 40 is located on the inner circumference of the stationary blade segment 31. Therefore, the stationary blade segment 31 with the curvature adjustment fixture 40 mounted on it can be installed on the inner circumference of the stationary blade retaining ring 21 without the curvature adjustment fixture 40 interfering with the stationary blade retaining ring 21. That is, in this method, the stationary blade segment 31 can be installed on the inner circumference of the stationary blade retaining ring 21 when the curvature of the stationary blade segment 31 reaches a predetermined curvature. Therefore, in this method, the stationary blade segment 31 can be easily installed on the inner circumference of the stationary blade retaining ring 21.

[0077] (2) Regarding the curvature adjustment method of the stationary blade segment in the second method,

[0078] In the curvature adjustment method of the stationary blade segment 31 in the first embodiment, the curvature adjustment fixture 40 includes: a first base 41a, including a first end 42a; a second base 41b, including a second end 42b; a first fixing part 46a, capable of fixing the first end 42a to the first position 36a of the inner connecting member 35; a second fixing part 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 main body 51; a first rod 53a extending from the main body 51 to a first side Dd1 on both sides in the distance adjustment direction Dd with an adjustable distance; and a second rod 53b extending from the main body 51 to a second side Dd2 opposite to the first side Dd1 on the distance adjustment direction Dd with an adjustable distance. On the first side Dd1 portion of the first rod 53a, a first base 41a is mounted in such a way that it can swing about an axis extending in a direction perpendicular to the distance adjustment direction Dd. On the second side Dd2 portion of the second rod 53b, a second base 41b is mounted in such a way that it can swing about an axis extending in a direction perpendicular to the distance adjustment direction Dd.

[0079] (3) Regarding the curvature adjustment method of the stationary blade segment in the third method.

[0080] In the curvature adjustment method of the stationary blade segment 31 in the second embodiment, a first internal thread 52a extending along the distance adjustment direction Dd is formed on the main body 51 on the first side Dd1 portion, and a second internal thread 52b extending along the distance adjustment direction Dd is formed on the second side Dd2 portion. The second internal thread 52b is a reverse thread relative to the first internal thread 52a. A first external thread 54a screwed into the first internal thread 52a is formed on the second side Dd2 portion of the first rod 53a. A second external thread 54b screwed into the second internal thread 52b is formed on the first side Dd1 portion of the second rod 53b.

[0081] The method for manufacturing the stationary body of the axial-flow rotating machinery in the above embodiments is as follows.

[0082] (4) Regarding the method for manufacturing a stationary body of an axial-flow rotating machine in the fourth method, the curvature adjustment method of the stationary blade segment 31 in any one of the first to the third methods is performed.

[0083] The following steps are then performed: component preparation step S1, preparing the stationary blade segment 31 and the stationary blade retaining ring 21, which is arc-shaped and has the stationary blade segment 31 installed on its inner circumference; stationary blade segment installation step S6, after the curvature adjustment step S5, installing the stationary blade segment 31 with the curvature adjustment fixture 40 installed on the inner circumference of the stationary blade retaining ring 21; and fixture removal step S7, after the stationary blade segment installation step S6, removing the curvature adjustment fixture 40 from the stationary blade segment 31.

[0084] In this method, the stationary blade segment 31 can be easily installed on the inner circumferential side of the stationary blade retaining ring 21. Therefore, this method can improve the manufacturing efficiency of the stationary body.

[0085] (5) Regarding the method for manufacturing the stationary body of the axial-flow rotating machinery in the fifth method,

[0086] In the fourth method for manufacturing a stationary body of an axial-flow rotating machine, in the curvature adjustment step S5, the distance between the first end 42a and the second end 42b of the curvature adjustment fixture 40 is changed so that the curvature of the outer peripheral edge of the stationary blade segment 31 reaches the curvature of the inner peripheral edge of the stationary blade retaining ring 21.

[0087] The curvature adjustment fixture for the stationary blade segment in the above embodiments is as follows.

[0088] (6) Regarding the curvature adjustment fixture of the stationary blade segment in the sixth method, the stationary blade segment 31, in which multiple stationary blades 32 are arranged circumferentially Dc and installed on the outer periphery of the arc-shaped inner connecting member 35, is taken as the object.

[0089] The curvature adjustment fixture 40 includes: a first base 41a, including a first end 42a; a second base 41b, including a second end 42b; a first fixing part 46a, capable of fixing the first end 42a at a first position 36a of the inner connecting member 35; a second fixing part 46b, capable of fixing the second end 42b at a second position 36b of the inner connecting member 35, spaced apart from the first position 36a along 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 circumference of the inner connecting member 35 when the first end 42a is fixed at the first position 36a of the inner connecting member 35 and the second end 42b is fixed at the second position 36b of the inner connecting member 35. The distance adjustment mechanism 50 includes: a main body 51; a first rod 53a extending from the main body 51 toward a first side Dd1 on both sides in the distance adjustment direction Dd in an adjustable distance manner; and a second rod 53b extending from the main body 51 toward a second side Dd2 opposite to the first side Dd1 on the distance adjustment direction Dd in an adjustable distance manner. A first base 41a is mounted on the first side Dd1 portion of the first rod 53a in a manner capable of pivoting about an axis extending in a direction perpendicular to the distance adjustment direction Dd. A second base 41b is mounted on the second side Dd2 portion of the second rod 53b in a manner capable of pivoting about an axis extending in a direction perpendicular to the distance adjustment direction Dd.

[0090] When the curvature adjustment fixture 40 of this method is installed on the stationary blade segment 31, the first end 42a of the first base 41a is fixed at the first position 36a of the inner connecting member 35 in the stationary blade segment 31, and the second end 42b of the second base 41b is fixed at the second position 36b of the inner connecting member 35 in the stationary blade segment 31. In this state, the distance adjustment mechanism 50 of the curvature adjustment fixture 40 is located on the inner circumference of the stationary blade segment 31. Therefore, the stationary blade segment 31 on which the curvature adjustment fixture 40 is installed can be installed on the inner circumference of the stationary blade retaining ring 21 without the curvature adjustment fixture 40 interfering with the stationary blade retaining ring 21.

[0091] (7) Regarding the curvature adjustment fixture for the stationary blade segment in the seventh method.

[0092] In the curvature adjustment fixture for the stationary blade segment in the sixth embodiment, a first internal thread 52a extending along the distance adjustment direction Dd is formed on the main body 51 at the first side Dd1 portion, and a second internal thread 52b extending along the distance adjustment direction Dd is formed at the second side Dd2 portion. The second internal thread 52b is a reverse thread relative to the first internal thread 52a. A first external thread 54a screwed into the first internal thread 52a is formed on the second side Dd2 portion of the first bar 53a. A second external thread 54b screwed into the second internal thread 52b is formed on the first side Dd1 portion of the second bar 53b.

[0093] Industrial availability

[0094] In one aspect of the invention, the stationary blade segment can be easily installed on the inner circumferential side of the stationary blade retaining ring.

[0095] Symbol Explanation

[0096] 1-Gas turbine, 2-Gas turbine rotor, 3-Intermediate housing, 11-Compressor, 12-Compressor rotor, 12s-Rotor shaft, 12b-Moving blade row, 13-Compressor housing, 14-Stationary blade row, 15-Burner, 16-Turbine, 17-Turbine rotor, 17s-Rotor shaft, 17b-Moving blade row, 18-Turbine housing, 19-Stationary blade row, 20-Housing body, 21-Stationary blade retaining ring, 21u-Upper stationary blade retaining ring, 21d-Lower stationary blade retaining ring, 22-Ring groove, 30-Stationary blade ring, 31-Stationary blade segment, 32-Stationary blade, 33-Blade body, 34i-Inner shroud, 34o-Outer shroud, 35-Connecting bracket (or inner connecting component), 36a-First position, 36b-Second position, 37a-First screw hole, 37b-Second screw hole 39-Connecting strap (or outer connecting part), 40-Curvature adjustment clamp, 41a-First base, 41b-Second base, 42a-First end, 42b-Second end, 43-Bracket contact plate part, 44-Buckling connecting plate part, 45-Pin, 46a-First fixing part, 46b-Second fixing part, 47-Bolt, 50-Screw fastener (or distance adjustment mechanism), 51-Main body part, 52a-First internal thread, 52b-Second internal thread, 53a-First bar, 53b-Second bar, 54a-First external thread, 54b-Second external thread, Ar-Axis, Da-Axis direction, Dau-Upstream side of axis, Dad-Downstream side of axis, Dc-Circumferential, Dr-Radial, Dri-Radial inner side, 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 stationary blade segment, wherein the arc-shaped stationary blade segment is formed by multiple stationary blades arranged circumferentially and installed on the outer periphery of an arc-shaped inner connecting component, and is used to embed into the annular groove of a stationary blade retaining ring, wherein the curvature adjustment method of the stationary blade segment comprises the following steps: The fixture preparation process involves preparing a curvature adjustment fixture 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. In the clamp installation process, with the distance adjustment mechanism of the curvature adjustment clamp disposed on the inner circumferential side of the inner connecting member in the stationary blade segment, the first end of the curvature adjustment clamp is fixed at a first position of the inner connecting member, and the second end of the curvature adjustment clamp is fixed at a second position of the inner connecting member, spaced circumferentially from the first position of the inner connecting member; and In the curvature adjustment process, after the fixture installation process, the distance adjustment mechanism is operated to change the distance between the first and second ends of the curvature adjustment fixture in such a way that the curvature of the outer peripheral edge of the arc-shaped stationary blade segment reaches the target curvature. In the curvature adjustment process, in the bottom surface of the annular groove, the straight-line distance between the contact position of one end of the stationary blade segment in the circumferential direction and the contact position of the other end of the stationary blade segment in the circumferential direction is measured and set as the target distance. The distance between the first end and the second end of the curvature adjustment fixture is changed in such a way that the straight-line distance between the end of the outer peripheral edge of the stationary blade segment in the circumferential direction and the end of the other peripheral edge of the outer peripheral edge of the stationary blade segment in the circumferential direction is used as the target distance.

2. The method for adjusting the curvature of the stationary blade segment according to claim 1, wherein, The curvature adjustment fixture includes: a first base including a first end; a second base including a 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 includes: a main body; a first rod extending from the main body to a first side on one of two sides in the distance adjustment direction with an adjustable distance; and a second rod extending from the main body to a second side opposite to the first side in the distance adjustment direction with an adjustable distance. On the first side portion of the first bar, the first base is mounted in a manner that allows it to swing about an axis extending in a direction perpendicular to the distance adjustment direction. On the second side portion of the second bar, a second base is mounted in such a way that it can swing about an axis extending in a direction perpendicular to the distance adjustment direction.

3. The method for adjusting the curvature of the stationary blade segment according to claim 2, wherein, On the main body, a first internal thread extending in the distance adjustment direction is formed on the portion on the first side, and a second internal thread extending in the distance adjustment direction is formed on the portion on the second side. The second internal thread is a reverse thread relative to the first internal thread. A first external thread is formed on the second side portion of the first bar, which is screwed into the first internal thread. A second external thread is formed on the first side portion of the second bar, which is screwed into the second internal thread.

4. A method for manufacturing a stationary body of an axial-flow rotating machine, comprising performing the curvature adjustment method for a stationary blade segment as described in any one of claims 1 to 3, and performing the following steps: The component preparation process includes preparing the stationary blade segment and a stationary blade retaining ring that is arc-shaped and has the stationary blade segment installed on its inner circumference. In the stationary blade segment installation process, after the curvature adjustment process, the stationary blade segment with the curvature adjustment fixture is installed on the inner circumference of the stationary blade retaining ring; and The fixture removal process involves removing the curvature adjustment fixture from the stationary blade segment after the stationary blade segment installation process.

5. The method for manufacturing the stationary body of an axial-flow rotating machine according to claim 4, wherein, In the curvature adjustment process, the distance between the first end and the second end of the curvature adjustment fixture is changed so that the curvature of the outer peripheral edge of the stationary blade segment reaches the curvature of the inner peripheral edge of the stationary blade retaining ring.

6. A curvature adjustment fixture for a stationary blade segment, the stationary blade segment being formed by a plurality of stationary blades arranged circumferentially and mounted on the outer periphery of an arc-shaped inner connecting component, and used to embed into an annular groove of a stationary blade retaining ring, the curvature adjustment fixture for the stationary blade segment having: A first base includes a first end; a second base includes a second end; a first fixing part is capable of fixing the first end at a first position of the inner connecting member; a second fixing part is capable of fixing the second end at a second position of the inner connecting member spaced apart from the first position along the circumferential direction; and a distance adjustment mechanism is capable of changing the distance between the first end and the second end. With the first end fixed to the first position of the inner connecting component and the second end fixed to the second position of the inner connecting component, the distance adjustment mechanism is located on the inner circumferential side of the inner connecting component. The distance adjustment mechanism includes: a main body; a first rod extending from the main body to a first side on one of two sides in the distance adjustment direction with an adjustable distance; and a second rod extending from the main body to a second side opposite to the first side in the distance adjustment direction with an adjustable distance. On the first side portion of the first bar, the first base is mounted in a manner that allows it to swing about an axis extending in a direction perpendicular to the distance adjustment direction. On the second side portion of the second bar, a second base is mounted in a manner that allows it to swing about an axis extending in a direction perpendicular to the distance adjustment direction. In the bottom surface of the annular groove, the straight-line distance between the contact position of one end of the stationary blade segment in the circumferential direction and the contact position of the other end of the stationary blade segment in the circumferential direction is measured and set as the target distance. The distance between the first end and the second end of the curvature adjustment fixture is changed in such a way that the straight-line distance between the end of the outer peripheral edge of the stationary blade segment in the circumferential direction and the end of the other peripheral edge of the outer peripheral edge of the stationary blade segment in the circumferential direction is used as the target distance.

7. The curvature adjustment fixture for the stationary blade segment according to claim 6, wherein, On the main body, a first internal thread extending in the distance adjustment direction is formed on the portion on the first side, and a second internal thread extending in the distance adjustment direction is formed on the portion on the second side. The second internal thread is a reverse thread relative to the first internal thread. A first external thread is formed on the second side portion of the first bar, which is screwed into the first internal thread. A second external thread is formed on the first side portion of the second bar, which is screwed into the second internal thread.

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