Turbine blade ring assembly and turbine assembly method

Abstract

A plurality of circumferentially-arranged split plates retained by a seal-ring retention ring include a plurality of first split-plate groups that are circumferentially arranged on one circumferential side of the seal-ring retention ring. The plurality of split plates constituting each of the first split-plate groups include: a first split plate; and a second split plate which is disposed at a location close to an end of the first split plate on the one circumferential side of the seal-ring retention ring and which is circumferentially adjacent to the first split plate. The first split plate has a one-side first overlapping portion that circumferentially overlaps the second split plate. The second split plate has an other-side second overlapping portion that circumferentially overlaps the one-side overlapping portion. The one-side first overlapping portion abuts against the other-side second overlapping portion by the first split plate being biased by a biasing spring.

Description

[Technical Field]

[0001] The present disclosure relates to a turbine blade ring assembly and a method of assembling a turbine. This application claims priority based on Japanese Patent Application No. 2022-076507, filed with the Japan Patent Office on May 6, 2022, the contents of which are incorporated herein by reference. [Background technology]

[0002] For example, a gas turbine includes a turbine blade ring including a blade ring holding a plurality of stator blades and a seal ring retainer ring. This turbine blade ring is configured to introduce cooling air into a space between the inside of the stator blades and the seal ring retainer ring (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2010-077869 Summary of the Invention [Problem to be solved by the invention]

[0004] For example, in the turbine blade ring described in Patent Document 1, a buffer plate (divided plate) attached to a seal ring retaining ring is biased by a spring to abut against a protrusion protruding radially inward from the inner shroud. In such divided plates, generally, adjacent divided plates in the circumferential direction are shiplap-joined to each other so that they can be attached to and detached from each other.

[0005] In a turbine blade ring having such a configuration, assembling the turbine includes a step of attaching the upper half of the blade ring, which holds multiple stator vanes, from the radially outer side of the upper half of the seal ring retaining ring, which holds multiple circumferentially arranged partition plates. In this step, a protrusion protruding radially inward from the inner shroud presses and moves the partition plate in the axial direction against the biasing force of a spring, until it overlaps and fits with the partition plate in the radial direction. At this time, the protrusion presses the partition plate in the axial direction, starting with the partition plate located closest to the horizontal partition plane.

[0006] Therefore, in the above process, the protruding portion may get caught on the dividing plate and ride up, making it impossible to smoothly fit the upper half of the blade ring, which can take a long time to perform the above process.

[0007] In view of the above circumstances, at least one embodiment of the present disclosure has an object to provide a turbine blade ring assembly and a turbine assembling method that enable efficient turbine assembly work. [Means for solving the problem]

[0008] (1) A turbine blade ring assembly according to at least one embodiment of the present disclosure includes: a blade ring having an arc shape; a plurality of stator blades held by the blade ring; a seal ring retaining ring having an arc shape; a plurality of divided plates arranged in a circumferential direction and held by the seal ring retaining ring; a plurality of biasing springs that bias the plurality of divided plates in the axial direction; Equipped with The plurality of stator vanes each have a protruding portion protruding radially inward, the plurality of biasing springs bias the plurality of divided plates to abut against the protrusions, The plurality of dividing plates are a first divided plate group including a plurality of divided plates arranged in the circumferential direction on one side of the seal ring retaining ring in the circumferential direction; a second divided plate group including a plurality of plates arranged in the circumferential direction on the other side of the seal ring retaining ring in the circumferential direction; Including, The plurality of divided plates constituting the first divided plate group are A first dividing plate; a second divided plate disposed at a position closer to the one end of the seal ring retaining ring in the circumferential direction relative to the first divided plate and adjacent to the first divided plate in the circumferential direction; Including, the first divided plate has a first overlapping portion on one side that overlaps with the second divided plate in the circumferential direction, the second divided plate has an other-side second overlapping portion that overlaps the one-side first overlapping portion in the circumferential direction, the first overlapping portion on one side comes into contact with the second overlapping portion on the other side when the first divided plate is biased by the biasing spring; The plurality of divided plates constituting the second divided plate group are A third dividing plate; a fourth divided plate that is disposed at a position closer to the other end of the seal ring retaining ring in the circumferential direction relative to the third divided plate and is adjacent to the third divided plate in the circumferential direction; Including, the third divided plate has a third overlapping portion on the other side that overlaps with the fourth divided plate in the circumferential direction, the fourth divided plate has a one-side fourth overlapping portion that overlaps with the other-side third overlapping portion in the circumferential direction, The third overlapping portion on the other side comes into contact with the fourth overlapping portion on the one side as the third divided plate is biased by the biasing spring. death, At least one of the first divided plates has a shape that is plane-symmetrical to at least one of the third divided plates. do.

[0009] (2) A turbine according to at least one embodiment of the present disclosure. wing ring assembly teeth, a blade ring having an arc shape; a plurality of stator blades held by the blade ring; a seal ring retaining ring having an arc shape; a plurality of divided plates arranged in a circumferential direction and held by the seal ring retaining ring; a plurality of biasing springs that bias the plurality of divided plates in the axial direction; Equipped with The plurality of stator vanes each have a protruding portion protruding radially inward, the plurality of biasing springs bias the plurality of divided plates to abut against the protrusions, The plurality of dividing plates are a first divided plate group including a plurality of divided plates arranged in the circumferential direction on one side of the seal ring retaining ring in the circumferential direction; a second divided plate group including a plurality of plates arranged in the circumferential direction on the other side of the seal ring retaining ring in the circumferential direction; Including, The plurality of divided plates constituting the first divided plate group are A first dividing plate; a second divided plate disposed at a position closer to the one end of the seal ring retaining ring in the circumferential direction relative to the first divided plate and adjacent to the first divided plate in the circumferential direction; Including, the first divided plate has a first overlapping portion on one side that overlaps with the second divided plate in the circumferential direction, the second divided plate has an other-side second overlapping portion that overlaps the one-side first overlapping portion in the circumferential direction, the first overlapping portion on one side comes into contact with the second overlapping portion on the other side when the first divided plate is biased by the biasing spring; The plurality of divided plates constituting the second divided plate group are A third dividing plate; a fourth divided plate that is disposed at a position closer to the other end of the seal ring retaining ring in the circumferential direction relative to the third divided plate and is adjacent to the third divided plate in the circumferential direction; Including, the third divided plate has a third overlapping portion on the other side that overlaps with the fourth divided plate in the circumferential direction, the fourth divided plate has a one-side fourth overlapping portion that overlaps with the other-side third overlapping portion in the circumferential direction, the other-side third overlapping portion abuts against the one-side fourth overlapping portion when the third divided plate is biased by the biasing spring; the plurality of divided plates includes a fifth divided plate disposed between the first divided plate and the third divided plate, the fifth divided plate has a one-side fifth overlapping portion that overlaps with the first divided plate in the circumferential direction and a second-side fifth overlapping portion that overlaps with the third divided plate in the circumferential direction, the first divided plate has a first overlapping portion on the other side that overlaps with the fifth divided plate in the circumferential direction, the third divided plate has a third overlapping portion on one side that overlaps with the fifth divided plate in the circumferential direction, the fifth overlapping portion on one side comes into contact with the first overlapping portion on the other side as the fifth divided plate is biased by the biasing spring; The other-side fifth overlapping portion is configured such that the fifth divided plate is biased by the biasing spring to the one-side third overlapping portion. and abuts against it. [Effects of the Invention]

[0010] At least one embodiment of the present disclosure allows for efficient turbine assembly operations. [Brief explanation of the drawings]

[0011] [Figure 1] 1 is a schematic diagram illustrating a configuration of a gas turbine including a turbine blade ring assembly according to an embodiment. [Figure 2] 1 is a cross-sectional view of a main part of a gas turbine according to an embodiment of the present invention. [Figure 3] 3 is a detailed cross-sectional view of the rotor disk and the seal ring retainer ring and their surroundings in FIG. 2. FIG. [Figure 4]1 is an axial upstream view of a turbine blade ring assembly according to an embodiment; FIG. [Figure 5] FIG. 10 is a schematic view showing the seal ring retainer ring developed in the circumferential direction to explain the arrangement of the divided plates. [Figure 6] 3 is a flowchart illustrating steps in a method for assembling a turbine including a turbine blade ring assembly according to one embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0012] Hereinafter, several embodiments of the present disclosure will be described with reference to the accompanying drawings. However, the dimensions, materials, shapes, relative arrangements, etc. of components described as embodiments or shown in the drawings are merely illustrative examples and are not intended to limit the scope of the present disclosure. For example, expressions expressing relative or absolute arrangement such as "in a certain direction," "along a certain direction," "parallel," "orthogonal," "center," "concentric," or "coaxial" not only express such an arrangement exactly, but also express a state in which there is a relative displacement with a tolerance or an angle or distance to the extent that the same function is obtained. For example, expressions such as "identical," "equal," and "homogeneous" that indicate that something is in an equal state not only indicate a state of strict equality, but also indicate a state in which there is a tolerance or a difference to the extent that the same function is obtained. For example, expressions representing shapes such as a square shape or a cylindrical shape not only represent shapes such as a square shape or a cylindrical shape in the strict geometric sense, but also represent shapes including uneven portions, chamfered portions, etc., to the extent that the same effect can be obtained. On the other hand, the expressions "comprise," "include," "have," "includes," or "have" of one element are not exclusive expressions that exclude the presence of other elements.

[0013] A gas turbine including a turbine blade ring assembly according to an embodiment will be described in detail below with reference to the drawings. FIG. 1 is a schematic diagram showing the configuration of a gas turbine including a turbine blade ring assembly according to one embodiment. FIG. 2 is a cross-sectional view of a main part of the gas turbine of this embodiment. FIG. 3 is a detailed cross-sectional view of the rotor disk and the seal ring retainer ring and their surroundings in FIG. FIG. 4 is a view of a turbine blade ring assembly according to one embodiment, viewed from the upstream side in the axial direction, showing a state in which the turbine blade ring assembly is in the middle of being attached to the turbine.

[0014] As shown in FIG. 1, the gas turbine 100 of this embodiment includes a compressor 1 that compresses outside air to generate compressed air, a plurality of combustors 2 that mix fuel supplied from a fuel supply source (not shown) with the compressed air and combust the fuel to generate combustion gas, and a turbine 3 that is driven by the combustion gas.

[0015] As shown in Fig. 2, the turbine 3 includes a rotor 10 that rotates about an axis Ar, and a casing 5 that rotatably covers the rotor 10. The rotor 10 is connected to, for example, a generator 4 (see Fig. 1) that generates electricity through the rotation of the rotor 10. In the following, the direction in which the axis Ar of the rotor 10 extends is referred to as the axial direction Da. In the radial direction Dr of the axis Ar, the side approaching the axis Ar is referred to as the radial inner side, and the side away from the axis Ar is referred to as the radial outer side.

[0016] The rotor 10 has multiple stages of rotor disks 11 stacked in the axial direction Da, and multiple rotor blades 21 fixed to each stage of the rotor disks 11 and arranged in the circumferential direction Dc of the axis Ar. A plurality of stator vanes 31 corresponding to the plurality of rotor blades 21 of each stage are fixed to the inner periphery of the casing 5 via a blade ring 111 shown in Fig. 4, which will be described later. The plurality of stator vanes 31 of each stage are arranged side by side in the circumferential direction Dc of the axis Ar. A seal ring retainer 40 is fixed to the radially inner side of the plurality of stator blades 31 of each stage.

[0017] 3, the rotor disks 11 at each of the multiple stages are formed with an upstream rim portion 12 that protrudes toward the upstream side Da1 in the axial direction Da, and a seal arm 14 and a downstream rim portion 15 that protrude toward the downstream side Da2 in the axial direction Da. The downstream rim portion 15 of the rotor disk 11 is located radially inward of the seal arm 14 and faces the upstream rim portion 12 of the downstream rotor disk 11d that is adjacent to the rotor disk 11 on the downstream side Da2. An air baffle 19 is provided between the downstream rim portion 15 of the upstream rotor disk 11u and the upstream rim portion 12 of the downstream rotor disk 11d.

[0018] The rotor blade 21 fixed to the rotor disk 11 has a rotor blade body 22 extending in the radial direction Dr, a platform 23 provided radially inside the rotor blade body 22, a shank 24 provided radially inside the platform 23, and a blade root (not shown) provided radially inside the shank 24. The rotor blade 21 is fixed to the rotor disk 11 by inserting the blade root of the rotor blade 21 into the rotor disk 11.

[0019] The stator vanes 31 fixed to the casing 5 via the blade ring 111 have a stator vane body 32 extending radially inward from the blade ring 111, an inner shroud 33 provided radially inward of the stator vane body 32, and a pair of legs (projections) 34 extending radially inward from the inner shroud 33. In other words, the blade ring 111 holds a plurality of stator vanes 31 arranged in the circumferential direction Dc. The inner shroud 33 and the seal ring retainer ring 40 form a first cavity C1 extending in the circumferential direction Dc. Additionally, the downstream rim portion 15 of the upstream rotor disk 11u and the seal ring retainer ring 40 form a second cavity C2 extending in the circumferential direction Dc. The first cavity C1 and the second cavity C2 communicate with each other via a plurality of through holes 62 formed in the seal ring retaining ring 40. The plurality of through holes 62 are provided at intervals in the circumferential direction Dc.

[0020] A compressed air supply line 39 is arranged in the stator vane body 32 so as to penetrate the stator vane body 32 in the radial direction Dr. The compressed air supply line 39 supplies a portion of compressed air A (cooling gas) extracted from the middle of the compressor 1 (see FIG. 1) to the inner shroud 33 to cool the stator vanes 31. An end of the compressed air supply line 39 opens at the first cavity C1.

[0021] As shown in FIG. 2, the space surrounded by the radially outer surface of the inner shroud 33 of the stator vane 31, the radially outer surface of the platform 23 of the rotor blade 21, and the inner circumferential surface of the casing 5 is a combustion gas flow path GP through which the combustion gas G from the combustor 2 flows.

[0022] As shown in Figure 3, a seal ring 72 that seals between the seal ring retaining ring 40 and the downstream rim portion 15 of the upstream rotor disk 11u, and a seal ring 73 that seals between the seal ring retaining ring 40 and the upstream rim portion 12 of the downstream rotor disk 11D are provided radially inside the seal ring retaining ring 40.

[0023] In one embodiment, the seal ring retaining ring 40 has a connection portion 43 formed on the radial outside of the seal ring retaining ring 40, which is connected to the leg portion 34d on the downstream side Da2 (axial downstream side Da2) of the pair of legs 34 of the inner shroud 33 in the axial direction Da. In addition, in one embodiment, the seal ring retaining ring 40 has a plurality of dividing plates 50 attached to the radial outside of the seal ring retaining ring 40, which are connected to the leg 34u on the upstream side Da1 (axially upstream side Da1) of the pair of legs 34 of the inner shroud 33 in the axial direction Da. Each of the multiple dividing plates 50 is biased toward the axial upstream side Da1 by a biasing spring 75, and the inner, radially outer region of the axial upstream side Da1 surface presses the axial downstream side Da2 surface of the leg 34u of the inner shroud 33 toward the axial upstream side Da1. The dividing plate 50 will be described in detail later.

[0024] A turbine 3 according to one embodiment includes a turbine blade ring assembly 110 according to one embodiment. The turbine blade ring assembly 110 according to one embodiment includes a blade ring 111 having an arc shape, a plurality of stator vanes 31 held by the blade ring 111, a seal ring retaining ring 40 having an arc shape, a plurality of divided plates 50 arranged in the circumferential direction Dc and held by the seal ring retaining ring 40, and a plurality of biasing springs 75 that bias the plurality of divided plates 50 in the axial direction Da.

[0025] As shown in Figure 4, the turbine 3 of one embodiment includes a turbine blade ring assembly 110 (upper half 110U) arranged in the upper half 3U of the turbine 3 and a turbine blade ring assembly 110 (lower half 110D) arranged in the lower half 3D of the turbine 3. In one embodiment of the turbine 3, the turbine blade ring 105 is formed by a turbine blade ring assembly 110 (upper half 110U) arranged in the upper half 3U of the turbine 3 and a turbine blade ring assembly 110 (lower half 110D) arranged in the lower half 3D of the turbine 3. The blade ring 111 includes an upper half portion 111U arranged in the upper half portion 3U of the turbine 3 and a lower half portion 111D arranged in the lower half portion 3D of the turbine 3. The seal ring retaining ring 40 includes an upper half portion 40U arranged in the upper half portion 3U of the turbine 3 and a lower half portion 40D arranged in the lower half portion 3D of the turbine 3.

[0026] Next, the operation of the gas turbine 100 of this embodiment will be described. High-temperature, high-pressure combustion gas G introduced from the combustor 2 passes through the combustion gas flow path GP and comes into contact with the rotor blades 21 in the process, causing the rotor 10 having the rotor blades 21 to rotate around the axis Ar.

[0027] Compressed air A (dash-dotted line) supplied from outside the casing 5 to a compressed air supply line 39 provided inside the stator vane 31 passes through the first cavity C1 and is discharged to the second cavity C2 via the through-holes 62. The compressed air A is made uniform in the circumferential direction Dc within the second cavity C2, and a portion of it leaks to the upstream side Da1 and is discharged into the combustion gas flow path GP. A portion of the compressed air A also leaks from the seal rings 72, 73 and is discharged into the combustion gas flow path GP. This prevents the combustion gas G from leaking into the gap between the stator vane 31 and the rotor 10.

[0028] (divided plate 50) 5 is a schematic diagram of the seal ring retaining ring 40 according to one embodiment, developed in the circumferential direction Dc, to explain the arrangement of the dividing plates 50 when the seal ring retaining ring 40 is viewed from the radially outer side. In FIG. 5, the turbine blade ring assembly 110 (upper half 110U) arranged in the upper half 3U of the turbine 3 is used as an example for explanation. Each of the divided plates 50 is a plate-shaped member extending in the circumferential direction Dc, and has an overlapping portion 51 formed at an end in the circumferential direction Dc that overlaps with another divided plate 50 adjacent in the circumferential direction Dc.

[0029] 4, in which the turbine blade ring assembly 110 according to one embodiment is viewed from the upstream side in the axial direction Da, the 12 o'clock direction is defined as 0 degrees and the clockwise direction is defined as positive. The 3 o'clock direction (90-degree direction) viewed from the 12 o'clock position (0-degree position) is defined as one side of the circumferential direction Dc, and the 9 o'clock direction (270-degree direction) viewed from the 12 o'clock position (0-degree position) is defined as the other side of the circumferential direction Dc.

[0030] In one embodiment of the turbine blade ring assembly 110, the multiple divided plates 50 include a first group of divided plates 501 arranged in the circumferential direction Dc on one side of the seal ring retaining ring 40 in the circumferential direction Dc, and a second group of divided plates 502 arranged in the circumferential direction Dc on the other side of the seal ring retaining ring 40 in the circumferential direction Dc.

[0031] (1st division plate group 501) The multiple divided plates 50 constituting the first divided plate group 501 include a first divided plate 510 and a second divided plate 520 arranged at a position closer to one end of the seal ring retaining ring 40 in the circumferential direction Dc than the first divided plate 510, and adjacent to the first divided plate 510 in the circumferential direction Dc.

[0032] The first divided plate 510 has a one-side first overlapping portion 511 formed at one end in the circumferential direction Dc and overlapping with the second divided plate 520 in the circumferential direction Dc, and an other-side first overlapping portion 512 formed at the other end in the circumferential direction Dc.

[0033] The second divided plate 520 has a one-side second overlapping portion 521 formed at one end in the circumferential direction Dc, and an other-side second overlapping portion 522 formed at the other end in the circumferential direction Dc and overlapping with the one-side first overlapping portion 511 of the first divided plate 510 in the circumferential direction Dc.

[0034] In one embodiment of the turbine blade ring assembly 110, the first overlapping portion 511 on one side of the first divided plate 510 abuts the second overlapping portion 522 on the other side of the second divided plate 520 when the first divided plate 510 is biased by the biasing spring 75.

[0035] The relationship between the first divided plate 510 and the second divided plate 520 described above applies to any two divided plates 50 adjacent to each other in the circumferential direction Dc among the plurality of divided plates 50 included in the first divided plate group 501. Therefore, the divided plate 50 that becomes the second divided plate 520 of two divided plates 50 adjacent to each other in the circumferential direction Dc becomes the first divided plate 510 with respect to the divided plate 50 that is arranged adjacent to the first divided plate 50 on one side in the circumferential direction Dc. That is, of the multiple divided plates 50 included in the first divided plate group 501, the divided plates other than the divided plates 50 at both ends in the circumferential direction Dc can be either the first divided plate 510 or the second divided plate 520, depending on their positional relationship in the circumferential direction Dc with the other divided plates 50.

[0036] In one embodiment of the turbine blade ring assembly 110, the multiple divided plates 50 included in the first divided plate group 501 may all have the same shape, for example, except for their length in the circumferential direction Dc, or they may all have the same shape including their length in the circumferential direction Dc. That is, the multiple divided plates 50 included in the first divided plate group 501 have a one-side overlapping portion 51a formed at one end in the circumferential direction Dc and an other-side overlapping portion 51b formed at the other end in the circumferential direction Dc.

[0037] In the turbine blade ring assembly 110 according to one embodiment, the first overlapping portion 511 on one side and the second overlapping portion 522 on the other side are shiplap-joined so as to be able to come into contact with and separate from each other. That is, the plurality of divided plates 50 included in the first divided plate group 501 are configured so that they can be shiplap joined to other divided plates 50 by meshing with each other via one-side overlapping portions 51a and other-side overlapping portions 51b.

[0038] In the plurality of divided plates 50 included in the first divided plate group 501, the one-side overlapping portion 51a and the other-side overlapping portion 51b protrude in the circumferential direction Dc so as to form a half-notched joint. The one-side overlapping portion 51a has a shape in which an upstream side Da1 in the axial direction is cut out, and the other-side overlapping portion 51b has a shape in which a downstream side Da2 in the axial direction is cut out. In addition, in the multiple divided plates 50 included in the first divided plate group 501, the one-side overlapping portion 51a and the other-side overlapping portion 51b may be formed to form an inclined seam having an inclined surface that is inclined so that the dimension in the axial direction Da gradually decreases toward the end side in the circumferential direction Dc.

[0039] In one embodiment, in the multiple divided plates 50 included in the first divided plate group 501, the surface 51s facing the axial upstream side Da1 in the other side overlapping portion 51b and the surface 50s facing the axial upstream side Da1 in the region on one side of the other side overlapping portion 51b in the circumferential direction Dc may be flush with each other. Furthermore, in the multiple divided plates 50 included in the first divided plate group 501 in one embodiment, the surface 522s (surface 51s) facing the axial upstream side Da1 in the other side second overlapping portion 522 (other side overlapping portion 51b) of the second divided plate 520 and the surface 510s (surface 50s) facing the axial upstream side Da1 in the first divided plate 510 may be flush with each other. As a result, as will be described later, in the process of attaching the upper half 111U of the blade ring 111 holding multiple stator blades 31 to the upper half 40U of the seal ring retaining ring 40 attached to the turbine 3, the legs 34 are less likely to get caught on the dividing plate 50, and the upper half 111U of the blade ring 111 can be fitted in smoothly.

[0040] (Second division plate group 502) The multiple divided plates 50 that make up the second divided plate group 502 include a third divided plate 530 and a fourth divided plate 540 that is positioned closer to the other end of the seal ring retaining ring 40 in the circumferential direction Dc than the third divided plate 530 and is adjacent to the third divided plate 530 in the circumferential direction Dc.

[0041] The third divided plate 530 has a one-side third overlapping portion 531 formed at one end in the circumferential direction Dc, and an other-side third overlapping portion 532 formed at the other end in the circumferential direction Dc and overlapping with the fourth divided plate 540 in the circumferential direction Dc.

[0042] The fourth divided plate 540 has a one-side fourth overlapping portion 541 formed at one end in the circumferential direction Dc and overlapping with the other-side third overlapping portion 532 of the third divided plate 530 in the circumferential direction Dc, and an other-side fourth overlapping portion 542 formed at the other end in the circumferential direction Dc.

[0043] In one embodiment of the turbine blade ring assembly 110, the third overlapping portion 532 on the other side of the third divided plate 530 abuts against the fourth overlapping portion 541 on one side of the fourth divided plate 540 when the third divided plate 530 is biased by the biasing spring 75.

[0044] The relationship between the third divided plate 530 and the fourth divided plate 540 described above applies to any two divided plates 50 adjacent to each other in the circumferential direction Dc among the plurality of divided plates 50 included in the second divided plate group 502. Therefore, the divided plate 50 that becomes the fourth divided plate 540 among two divided plates 50 adjacent to each other in the circumferential direction Dc becomes the third divided plate 530 with respect to the divided plate 50 that is arranged adjacent to the first divided plate 50 on the other side in the circumferential direction Dc. That is, of the multiple divided plates 50 included in the second divided plate group 502, the divided plates other than the divided plates 50 at both ends in the circumferential direction Dc can also become the third divided plate 530 or the fourth divided plate 540 depending on their positional relationship in the circumferential direction Dc with the other divided plates 50.

[0045] In one embodiment of the turbine blade ring assembly 110, the multiple divided plates 50 included in the second divided plate group 502 may all have the same shape, for example, except for their length in the circumferential direction Dc, or may all have the same shape including their length in the circumferential direction Dc. That is, the multiple divided plates 50 included in the second divided plate group 502 have a one-side overlapping portion 51c formed at one end in the circumferential direction Dc and an other-side overlapping portion 51d formed at the other end in the circumferential direction Dc.

[0046] In the turbine blade ring assembly 110 according to one embodiment, the other-side third overlap portion 532 and the one-side fourth overlap portion 541 are shiplap-joined so as to be able to come into contact with and separate from each other. That is, the plurality of divided plates 50 included in the second divided plate group 502 are configured so that they can be shiplap joined to other divided plates 50 by meshing with each other via the one-side overlapping portion 51c and the other-side overlapping portion 51d.

[0047] In the plurality of divided plates 50 included in the second divided plate group 502, the one-side overlapping portion 51c and the other-side overlapping portion 51d protrude in the circumferential direction Dc so as to form a half-notched joint. The one-side overlapping portion 51c has a shape in which the downstream side Da2 in the axial direction is cut out, and the other-side overlapping portion 51d has a shape in which the upstream side Da1 in the axial direction is cut out. In addition, in the multiple divided plates 50 included in the second divided plate group 502, the one-side overlapping portion 51c and the other-side overlapping portion 51d may be formed to form an inclined seam having an inclined surface that is inclined so that the dimension in the axial direction Da gradually decreases toward the end side in the circumferential direction Dc.

[0048] In one embodiment, in the multiple divided plates 50 included in the second divided plate group 502, the surface 51s facing the axial upstream side Da1 in the one-side overlapping portion 51a and the surface 50s facing the axial upstream side Da1 in the region on the other side of the one-side overlapping portion 51a in the circumferential direction Dc may be flush with each other. Furthermore, in one embodiment, in the multiple divided plates 50 included in the second divided plate group 502, the surface 541s (surface 51s) facing the axial upstream side Da1 at the fourth overlapping portion 541 on one side (one side overlapping portion 51a) of the fourth divided plate 540 and the surface 530s (surface 50s) facing the axial upstream side Da1 at the third divided plate 530 may be flush with each other. As a result, as will be described later, in the process of attaching the upper half 111U of the blade ring 111 holding multiple stator blades 31 to the upper half 40U of the seal ring retaining ring 40 attached to the turbine 3, the legs 34 are less likely to get caught on the dividing plate 50, and the upper half 111U of the blade ring 111 can be fitted in smoothly.

[0049] Here, the effects of the turbine blade ring assembly 110 according to one embodiment will be described. In one embodiment of the turbine blade ring assembly 110, assembling the turbine 3 includes a process of attaching the upper half 111U of the blade ring 111, which holds multiple stator blades 31, to the upper half 40U of the seal ring retaining ring 40 attached to the turbine 3, as shown in Figure 4. In this step, the legs 34 protruding radially inward from the inner shroud 33 press and move the divided plates 50 in the axial direction Da against the biasing force of the biasing spring 75, and overlap and fit with the divided plates 50 in the radial direction Dr. At this time, the legs 34 press the divided plates 50 in the axial direction Da sequentially, starting from the divided plates 50 located closest to the horizontal dividing surface 5P.

[0050] Therefore, in the conventional turbine blade ring, in the above process, the legs 34 sometimes get caught on the dividing plate 50 and ride up, making it impossible to smoothly fit the upper half 111U of the blade ring 111. As a result, it sometimes took a long time to perform the above process.

[0051] In the turbine blade ring assembly 110 according to one embodiment, when the blade ring 111 (upper half 111U) holding a plurality of stator blades 31 is attached from the radially outer side of the seal ring retaining ring 40 that holds a plurality of divided plates 50 arranged in the circumferential direction Dc, the legs 34 press the second divided plate 520, which is arranged near one end of the seal ring retaining ring 40 in the circumferential direction Dc, in the axial direction Da before the first divided plate 510. Here, the one-side first overlapping portion 511 abuts against the other-side second overlapping portion 522 as the first divided plate 510 is biased by the biasing spring 75. Therefore, when the legs 34 press and move the second divided plate 520 in the axial direction Da against the biasing force of the biasing spring 75, the other-side second overlapping portion 522 presses the one-side first overlapping portion 511 in the axial direction Da. Therefore, the risk of the legs 34 getting caught on the first divided plate 510 and riding up can be reduced.

[0052] Similarly, when the blade ring 111 (upper half 111U) holding a plurality of stator vanes 31 is attached from the radial outside of the seal ring retainer ring 40 that holds a plurality of divided plates 50 arranged in the circumferential direction Dc, the leg 34 presses the fourth divided plate 540, which is arranged near the other end of the seal ring retainer ring 40 in the circumferential direction Dc, in the axial direction Da before the third divided plate 530 in the second divided plate group 502. Here, the other-side third overlapping portion 532 abuts against the one-side fourth overlapping portion 541 due to the third divided plate 530 being biased by the biasing spring 75. Therefore, when the leg 34 presses and moves the fourth divided plate 540 in the axial direction Da against the biasing force of the biasing spring 75, the one-side fourth overlapping portion 541 presses the other-side third overlapping portion 532 in the axial direction Da. This reduces the risk of the leg 34 getting caught on and riding up the third divided plate 530.

[0053] Therefore, according to the turbine blade ring assembly 110 according to one embodiment, when attaching the blade ring 111 to the seal ring retaining ring 40, the risk of the legs 34 getting caught on and riding up the dividing plate 50 can be reduced, thereby shortening the time required for the work of integrating the seal ring retaining ring 40 and the blade ring 111. This allows the assembly work of the turbine 3 to be carried out efficiently.

[0054] In the turbine blade ring assembly 110 according to one embodiment, at least one of the first divided plates 510 may have the same shape as at least one of the second divided plates 520. At least one of the third divided plates 530 may have the same shape as at least one of the fourth divided plates 540. This allows the turbine blade ring assembly 110 to use common parts, thereby reducing manufacturing costs.

[0055] In the turbine blade ring assembly 110 according to one embodiment, at least one of the first divided plates 510 may have a shape that is plane-symmetrical to at least one of the third divided plates 530 . This reduces the difference in the shape of the divided plates 50 between the first divided plate group 501 and the second divided plate group 502, and suppresses the difference in performance such as sealing ability with the leg portion 34 and the difference in assembly ease between the first divided plate group 501 and the second divided plate group 502.

[0056] Similarly, in the turbine blade ring assembly 110 according to one embodiment, at least one of the second divided plates 520 may have a shape that is plane-symmetrical to at least one of the fourth divided plates 540 . This reduces the difference in the shape of the divided plates 50 between the first divided plate group 501 and the second divided plate group 502, and suppresses the difference in performance such as sealing ability with the leg portion 34 and the difference in assembly ease between the first divided plate group 501 and the second divided plate group 502.

[0057] In one embodiment of the turbine blade ring assembly 110, as described above, the first overlapping portion 511 on one side and the second overlapping portion 522 on the other side are shiplap joined so that they can be separated from each other, and the third overlapping portion 532 on the other side and the fourth overlapping portion 541 on one side are shiplap joined so that they can be separated from each other. This makes it possible to improve the sealing performance between the first overlapping portion 511 on one side and the second overlapping portion 522 on the other side, and between the third overlapping portion 532 on the other side and the fourth overlapping portion 541 on one side with a relatively simple structure.

[0058] In one embodiment of the turbine blade ring assembly 110, the multiple dividing plates 50 may be arranged in the circumferential direction Dc from one end 40a of the seal ring retaining ring 40 to the other end 40b of the seal ring retaining ring 40. This reduces the risk that the legs 34 will get caught on and ride up the dividing plates 50 when attaching the blade ring 111 to the seal ring retaining ring 40 over the entire circumferential direction Dc of the seal ring retaining ring 40 .

[0059] The turbine blade ring assembly 110 according to the embodiment described above may be the upper half portion of the turbine blade ring 105 (upper half portion 110U). When the upper half 111U of the blade ring 111 holding the plurality of stator blades 31 is attached from the radially outer side of the upper half 40U of the seal ring retaining ring 40 that holds the plurality of divided plates 50 arranged in the circumferential direction Dc, blade stages exist on both sides in the axial direction Da of the upper half 40U of the seal ring retaining ring 40. Therefore, if the leg 34 gets caught on the divided plate 50, the blade row gets in the way, making correction difficult. According to the turbine blade ring assembly 110 of one embodiment, the risk of the legs 34 getting caught on and riding up the dividing plate 50 when installing the upper half 111U of the blade ring 111, which is difficult to correct as described above, can be reduced, thereby making the effect of reducing this risk even greater.

[0060] (Regarding the fifth divided plate 550) In the turbine blade ring assembly 110 according to one embodiment, the plurality of divided plates 50 may include a fifth divided plate 550 that is disposed between the first divided plate group 501 and the second divided plate group 502, i.e., between the first divided plate 510 and the third divided plate 530. The fifth divided plate 550 may have a fifth overlapping portion 551 on one side that overlaps with the first divided plate 510 in the circumferential direction Dc, and a fifth overlapping portion 552 on the other side that overlaps with the third divided plate 530 in the circumferential direction Dc. The first divided plate 510 adjacent to the fifth divided plate 550 in the circumferential direction Dc may have a first overlapping portion 512 on the other side that overlaps with the fifth divided plate 550 in the circumferential direction Dc. The third divided plate 530 adjacent to the fifth divided plate 550 in the circumferential direction Dc may have a third overlapping portion 531 on one side that overlaps with the fifth divided plate 550 in the circumferential direction Dc. The fifth divided plate 550 is biased by the biasing spring 75, so that the one-side fifth overlapping portion 551 abuts against the other-side first overlapping portion 512 of the first divided plate 510 adjacent to the fifth divided plate 550 in the circumferential direction Dc. The fifth divided plate 550 is biased by the biasing spring 75, so that the other-side fifth overlapping portion 552 abuts against the one-side third overlapping portion 531 of the third divided plate 530 adjacent to the fifth divided plate 550 in the circumferential direction Dc.

[0061] As a result, when the blade ring 111 (upper half 111U) holding the plurality of stator blades 31 is attached from the radial outside of the seal ring retaining ring 40 that holds the plurality of divided plates 50 arranged in the circumferential direction Dc, the legs 34 press the first divided plate 510 adjacent to the fifth divided plate 550 in the axial direction Da before the fifth divided plate 550. Here, the one-side fifth overlapping portion 551 abuts against the other-side first overlapping portion 512 as the fifth divided plate 550 is biased by the biasing spring 75. Therefore, when the legs 34 press and move the first divided plate 510 in the axial direction Da against the biasing force of the biasing spring 75, the other-side first overlapping portion 512 presses the one-side fifth overlapping portion 551 in the axial direction Da. This reduces the risk of the legs 34 getting caught on and riding up the fifth divided plate 550.

[0062] Similarly, when the blade ring 111 (upper half 111U) holding a plurality of stator blades 31 is attached from the radial outside of the seal ring retaining ring 40 that holds a plurality of divided plates 50 arranged in the circumferential direction Dc, the legs 34 press the third divided plate 530, which is adjacent to the fifth divided plate 550 in the circumferential direction Dc, in the axial direction Da before the fifth divided plate 550. Here, the other-side fifth overlapping portion 552 abuts against the one-side third overlapping portion 531 because the fifth divided plate 550 is biased by the biasing spring 75. Therefore, when the legs 34 press and move the third divided plate 530 in the axial direction Da against the biasing force of the biasing spring 75, the one-side third overlapping portion 531 presses the other-side fifth overlapping portion 552 in the axial direction Da. This reduces the risk of the legs 34 getting caught on and riding up the fifth divided plate 550.

[0063] Therefore, according to the turbine blade ring assembly 110 according to one embodiment, when attaching the blade ring 111 to the seal ring retaining ring 40, it is possible to reduce the risk of the legs 34 getting caught on and riding up the fifth divided plate 550, thereby shortening the time required for attaching the blade ring 111 to the seal ring retaining ring 40. This allows the assembly work of the turbine 3 to be carried out efficiently.

[0064] In one embodiment of the turbine blade ring assembly 110, the fifth partition plate 550 may be positioned between a position 30 degrees away from the center position of the seal ring retaining ring 40 in the circumferential direction Dc (e.g., the 0 degree position in Figure 4) to one side of the circumferential direction Dc (e.g., the 30 degree position in Figure 4) and a position 30 degrees away from the other side of the circumferential direction Dc (e.g., the 330 degree position in Figure 4).

[0065] After careful consideration by the inventors, it was found that the area where there is a relatively high risk of the leg 34 getting caught on the dividing plate 50 and riding up when attaching the blade ring 111 to the seal ring retaining ring 40 is near a position 45 degrees away from the center position in the circumferential direction Dc of the seal ring retaining ring 40 (for example, the 0 degree position in Figure 4) to one side or the other in the circumferential direction Dc (for example, the 45 degree position or the 315 degree position in Figure 4). According to one embodiment of the turbine blade ring assembly 110, the partition plates 50 of the first partition plate group 501 or the second partition plate group 502, rather than the fifth partition plate 550, are positioned in an area where there is a relatively high risk of the legs 34 getting caught on and riding up the partition plates 50 when attaching the blade ring 111 to the seal ring retaining ring 40, thereby reducing the above-mentioned risk.

[0066] In one embodiment of the turbine blade ring assembly 110, the fifth overlapping portion 551 on one side of the fifth divided plate 550 and the first overlapping portion 512 on the other side of the first divided plate 510 adjacent to the fifth divided plate 550 in the circumferential direction Dc may be shiplap joined so that they can be attached to and detached from each other. Similarly, in one embodiment of the turbine blade ring assembly 110, the fifth overlapping portion 552 on the other side of the fifth divided plate 550 and the third overlapping portion 531 on one side of the third divided plate 530 adjacent to the fifth divided plate 550 in the circumferential direction Dc may be shiplap joined so that they can be attached to and detached from each other.

[0067] A fifth overlapping portion 551 on one side of the fifth divided plate 550 and a first overlapping portion 512 on the other side of the first divided plate 510 adjacent to the fifth divided plate 550 in the circumferential direction Dc protrude from each other in the circumferential direction Dc to form a half-joint. The fifth overlapping portion 551 on one side has a shape in which the upstream side Da1 in the axial direction is cut out, and the first overlapping portion 512 on the other side of the first divided plate 510 adjacent to the fifth divided plate 550 in the circumferential direction Dc has a shape in which the downstream side Da2 in the axial direction is cut out.

[0068] The other-side fifth overlapping portion 552 of the fifth divided plate 550 and the one-side third overlapping portion 531 of the third divided plate 530 adjacent to the fifth divided plate 550 in the circumferential direction Dc protrude from each other in the circumferential direction Dc to form a half-joint. The other-side fifth overlapping portion 552 has a shape in which the upstream side Da1 in the axial direction is cut out, and the one-side third overlapping portion 531 of the third divided plate 530 adjacent to the fifth divided plate 550 in the circumferential direction Dc has a shape in which the downstream side Da2 in the axial direction is cut out.

[0069] This makes it possible to improve the sealing performance between the one-side fifth overlapping portion 551 and the other-side first overlapping portion 512, and between the other-side fifth overlapping portion 552 and the one-side third overlapping portion 531, with a relatively simple structure.

[0070] In addition, the fifth overlapping portion 551 on one side of the fifth divided plate 550 and the first overlapping portion 512 on the other side of the first divided plate 510 adjacent to the fifth divided plate 550 in the circumferential direction Dc may be formed to form an inclined seam having an inclined surface that is inclined so that the dimension in the axial direction Da gradually decreases toward the end side in the circumferential direction Dc. Similarly, the fifth overlapping portion 552 on the other side of the fifth divided plate 550 and the third overlapping portion 531 on one side of the third divided plate 530 adjacent to the fifth divided plate 550 in the circumferential direction Dc may be formed to form an inclined seam having an inclined surface that is inclined so that the dimension in the axial direction Da gradually decreases toward the end side in the circumferential direction Dc.

[0071] (Assembling method of turbine 3) FIG. 6 is a flowchart showing the steps of a method for assembling the turbine 3 including the turbine blade ring assembly 110 according to the embodiment described above. An assembly method for a turbine 3 according to one embodiment includes step S1 of attaching the lower half 110D of the turbine blade ring assembly 110, step S3 of attaching the rotor 10, step S5 of attaching the upper half 40U of the seal ring retaining ring 40, and step S7 of attaching the upper half 111U of the blade ring 111.

[0072] (Step S1 of attaching the lower half 110D of the turbine blade ring assembly 110) The step S1 of attaching the lower half 110D of the turbine blade ring assembly 110 is a step of attaching the lower half 110D of the turbine blade ring assembly 110 to the casing lower half 5D of the turbine 3. In process S1 of attaching the lower half 110D of the turbine blade ring assembly 110, the lower half 40D of the seal ring retaining ring 40 is attached to the lower half 111D of the blade ring 111, which holds a plurality of stator blades 31, at a location different from the installation location of the casing lower half 5D of the turbine 3. Note that in the lower half 110D of the turbine blade ring assembly 110 according to one embodiment, the lower half 40D of the seal ring retaining ring 40 may have a configuration similar to that of the upper half 110U of the turbine blade ring assembly 110 according to the above-described one embodiment.

[0073] Thereafter, the lower half 110D of the turbine blade ring assembly 110, in which the lower half 111D of the blade ring 111 and the lower half 40D of the seal ring retainer ring 40 are integrated, is attached to the casing lower half 5D of the turbine 3.

[0074] (Step S3 of attaching the rotor 10) The step S3 of attaching the rotor 10 is a step of attaching the rotor 10 to the casing lower half 5D of the turbine 3 to which the lower half 110D of the turbine blade ring assembly 110 is attached. In step S3 of attaching the rotor 10, the rotor 10 having multiple stages of rotor disks 11 and multiple rotor blades 21 fixed to each stage of the rotor disks 11 as described above is attached to the lower half 5D of the casing of the turbine 3.

[0075] (Step S5 of attaching the upper half 40U of the seal ring retainer ring 40) Process S5 of attaching the upper half 40U of the seal ring retaining ring 40 is a process of attaching the upper half 40U of the seal ring retaining ring 40 to the casing lower half 5D of the turbine 3 to which the rotor 10 is attached. That is, process S5 of attaching the upper half 40U of the seal ring retaining ring 40 is a process of attaching the upper half 40U of the seal ring retaining ring 40, which includes a plurality of divided plates 50 arranged in the circumferential direction Dc and a plurality of biasing springs 75 that bias the plurality of divided plates 50 in the axial direction Da, to the casing lower half 5D to which the lower half 110D of the turbine blade ring assembly 110 is attached, the lower half 111D of which includes the blade ring 111 (lower half 111D) that holds a plurality of stator blades 31 and the lower half 40D of the seal ring retaining ring 40. In process S5 of attaching the upper half 40U of the seal ring retaining ring 40, the upper half 40U of the seal ring retaining ring 40 according to the embodiment described above is attached to the lower half 40D of the seal ring retaining ring 40 attached to the lower half 5D of the turbine 3's casing.

[0076] (Step S7 of attaching the upper half 111U of the blade ring 111) Process S7 of attaching the upper half 111U of the blade ring 111 is a process of attaching the upper half 111U of the blade ring 111, which holds multiple stator vanes 31, to the upper half 40U of the seal ring retaining ring 40 attached to the lower half 5D of the casing, as shown in Figure 4. In step S7 of attaching the upper half 111U of the blade ring 111, the leg 34 of the stator vane 31 held in the upper half 111U of the blade ring 111 presses the second divided plate 520, which is located near one end of the upper half 40U of the seal ring retaining ring 40 in the circumferential direction Dc, in the axial direction Da before the first divided plate 510. Here, the one-side first overlapping portion 511 abuts against the other-side second overlapping portion 522 due to the first divided plate 510 being biased by the biasing spring 75. Therefore, when the leg 34 presses and moves the second divided plate 520 in the axial direction Da against the biasing force of the biasing spring 75, the other-side second overlapping portion 522 presses the one-side first overlapping portion 511 in the axial direction Da. This reduces the risk of the leg 34 getting caught on and riding up the first divided plate 510.

[0077] Similarly, in step S7 of attaching the upper half 111U of the blade ring 111, the leg 34 of the stator vane 31 held in the upper half 111U of the blade ring 111 presses the fourth divided plate 540, which is located near the other end of the upper half 40U of the seal ring retaining ring 40 in the circumferential direction Dc, in the axial direction Da before the third divided plate 530. Here, the other-side third overlapping portion 532 abuts against the one-side fourth overlapping portion 541 due to the third divided plate 530 being biased by the biasing spring 75. Therefore, when the leg 34 presses and moves the fourth divided plate 540 in the axial direction Da against the biasing force of the biasing spring 75, the one-side fourth overlapping portion 541 presses the other-side third overlapping portion 532 in the axial direction Da. This reduces the risk of the leg 34 getting caught on and riding up the third divided plate 530.

[0078] Therefore, according to the method for assembling the turbine 3 according to one embodiment, the risk of the legs 34 getting caught on and riding up on the dividing plate 50 in step S7 of attaching the upper half 111U of the blade ring 111 can be reduced, and the time required to perform step S7 of attaching the upper half 111U of the blade ring 111 can be shortened. This allows the assembly work of the turbine 3 to be carried out efficiently.

[0079] The present disclosure is not limited to the above-described embodiments, but also includes modifications to the above-described embodiments and appropriate combinations of these modifications.

[0080] The contents described in each of the above embodiments can be understood, for example, as follows. (1) A turbine blade ring assembly according to at least one embodiment of the present disclosure includes a blade ring 111 having an arc-shaped configuration, a plurality of stator vanes 31 held by the blade ring 111, a seal ring retaining ring 40 having an arc-shaped configuration, a plurality of divided plates 50 held by the seal ring retaining ring 40 and arranged in the circumferential direction Dc, and a plurality of biasing springs 75 that bias the plurality of divided plates 50 in the axial direction Da. The plurality of stator vanes 31 have protrusions (leg portions 34) that protrude radially inward. The plurality of biasing springs 75 bias the plurality of divided plates 50 to abut against the protrusions (leg portions 34). The plurality of divided plates 50 include a first divided plate group 501 that is arranged in the circumferential direction Dc on one side of the seal ring retaining ring 40 in the circumferential direction Dc, and a second divided plate group 502 that is arranged in the circumferential direction Dc on the other side of the seal ring retaining ring 40 in the circumferential direction Dc. The plurality of divided plates 50 constituting the first divided plate group 501 includes a first divided plate 510 and a second divided plate 520 that is arranged at a position closer to one end of the seal ring retaining ring 40 in the circumferential direction Dc than the first divided plate 510 and is adjacent to the first divided plate 510 in the circumferential direction Dc. The first divided plate 510 has a one-side first overlapping portion 511 that overlaps with the second divided plate 520 in the circumferential direction Dc. The second divided plate 520 has an other-side second overlapping portion 522 that overlaps the one-side first overlapping portion 511 in the circumferential direction Dc. The one-side first overlapping portion 511 abuts against the other-side second overlapping portion 522 when the first divided plate 510 is biased by the biasing spring 75. The plurality of divided plates 50 constituting the second divided plate group 502 includes a third divided plate 530 and a fourth divided plate 540 that is arranged at a position closer to the other end of the seal ring retaining ring 40 in the circumferential direction Dc relative to the third divided plate 530 and is adjacent to the third divided plate 530 in the circumferential direction Dc. The third divided plate 530 has an other-side third overlapping portion 532 that overlaps with the fourth divided plate 540 in the circumferential direction Dc. The fourth divided plate 540 has a one-side fourth overlapping portion 541 that overlaps with the other-side third overlapping portion 532 in the circumferential direction Dc. The other-side third overlapping portion 532 abuts against the one-side fourth overlapping portion 541 when the third divided plate 530 is biased by the biasing spring 75.

[0081] According to the configuration (1) above, when the blade ring 111 holding the plurality of stator vanes 31 is attached from the radial outside of the seal ring retaining ring 40 that holds the plurality of divided plates 50 arranged in the circumferential direction Dc, the protruding portion (leg portion 34) of the first divided plate group 501 presses the second divided plate 520, which is arranged near one end of the seal ring retaining ring 40 in the circumferential direction Dc, in the axial direction Da before the first divided plate 510. Here, the one-side first overlapping portion 511 abuts against the other-side second overlapping portion 522 as the first divided plate 510 is biased by the biasing spring 75. Therefore, when the protruding portion (leg portion 34) presses and moves the second divided plate 520 in the axial direction Da against the biasing force of the biasing spring 75, the other-side second overlapping portion 522 presses the one-side first overlapping portion 511 in the axial direction Da. Therefore, the risk of the protruding portion (leg portion 34) getting caught on the first divided plate 510 and riding up can be reduced.

[0082] Furthermore, according to the configuration (1) above, when the blade ring 111 holding the plurality of stator vanes 31 is attached from the radial outside of the seal ring retainer ring 40 that holds the plurality of divided plates 50 arranged in the circumferential direction Dc, the protruding portion (leg portion 34) of the second divided plate group 502 presses the fourth divided plate 540, which is arranged near the other end of the seal ring retainer ring 40 in the circumferential direction Dc, in the axial direction Da before the third divided plate 530. Here, the other-side third overlapping portion 532 abuts against the one-side fourth overlapping portion 541 as the third divided plate 530 is biased by the biasing spring 75. Therefore, when the protruding portion (leg portion 34) presses and moves the fourth divided plate 540 in the axial direction Da against the biasing force of the biasing spring 75, the one-side fourth overlapping portion 541 presses the other-side third overlapping portion 532 in the axial direction Da. Therefore, the risk of the protruding portion (leg portion 34) getting caught on the third divided plate 530 and riding up can be reduced.

[0083] Therefore, according to the configuration (1) above, when attaching the blade ring 111 to the seal ring retaining ring 40, it is possible to reduce the risk that the protruding portions (leg portions 34) will get caught on and ride up the dividing plate 50, thereby shortening the time required to integrate the seal ring retaining ring 40 and the blade ring 111. This allows the turbine assembly work to be carried out efficiently.

[0084] (2) In some embodiments, in the configuration of (1) above, at least one of the first divided plates 510 may have the same shape as at least one of the second divided plates 520. At least one of the third divided plates 530 may have the same shape as at least one of the fourth divided plates 540.

[0085] According to the configuration (2) above, the turbine blade ring assembly 110 can use common parts, thereby reducing manufacturing costs.

[0086] (3) In some embodiments, in the configuration of (1) or (2) above, at least one of the first divided plates 510 may have a shape that is plane-symmetrical to at least one of the third divided plates 530 .

[0087] According to the above configuration (3), the difference in shape of the divided plates 50 between the first divided plate group 501 and the second divided plate group 502 can be reduced, and the difference in performance such as sealing ability with the protruding portion (leg portion 34) and the difference in assembly ability between the first divided plate group 501 and the second divided plate group 502 can be suppressed.

[0088] (4) In some embodiments, in any of the configurations (1) to (3) above, the multiple divided plates 50 may include a fifth divided plate 550 disposed between the first divided plate 510 and the third divided plate 530. The fifth divided plate 550 may have a one-side fifth overlapping portion 551 overlapping with the first divided plate 510 in the circumferential direction Dc and an other-side fifth overlapping portion 552 overlapping with the third divided plate 530 in the circumferential direction Dc. The first divided plate 510 may have an other-side first overlapping portion 512 overlapping with the fifth divided plate 550 in the circumferential direction Dc. The third divided plate 530 may have a one-side third overlapping portion 531 overlapping with the fifth divided plate 550 in the circumferential direction Dc. The one-side fifth overlapping portion 551 may abut against the other-side first overlapping portion 512 when the fifth divided plate 550 is biased by the biasing spring 75. The other-side fifth overlapping portion 552 may come into contact with the one-side third overlapping portion 531 by the fifth divided plate 550 being biased by the biasing spring 75 .

[0089] According to the configuration (4) above, when the blade ring 111 holding the plurality of stator vanes 31 is attached from the radially outer side of the seal ring retaining ring 40 that holds the plurality of divided plates 50 arranged in the circumferential direction Dc, the protruding portion (leg portion 34) presses the first divided plate 510 in the axial direction Da before the fifth divided plate 550. Here, the one-side fifth overlapping portion 551 abuts against the other-side first overlapping portion 512 as the fifth divided plate 550 is biased by the biasing spring 75. Therefore, when the protruding portion (leg portion 34) presses and moves the first divided plate 510 in the axial direction Da against the biasing force of the biasing spring 75, the other-side first overlapping portion 512 presses the one-side fifth overlapping portion 551 in the axial direction Da. This reduces the risk that the protruding portion (leg portion 34) will get caught on and ride up on the fifth divided plate 550.

[0090] Furthermore, according to the configuration (4) above, when the blade ring 111 holding the plurality of stator vanes 31 is attached from the radially outer side of the seal ring retaining ring 40 that holds the plurality of divided plates 50 arranged in the circumferential direction Dc, the protruding portion (leg portion 34) presses the third divided plate 530 in the axial direction Da before the fifth divided plate 550. Here, the other-side fifth overlapping portion 552 abuts against the one-side third overlapping portion 531 as the fifth divided plate 550 is biased by the biasing spring 75. Therefore, when the protruding portion (leg portion 34) presses and moves the third divided plate 530 in the axial direction Da against the biasing force of the biasing spring 75, the one-side third overlapping portion 531 presses the other-side fifth overlapping portion 552 in the axial direction Da. This reduces the risk that the protruding portion (leg portion 34) will get caught on and ride up on the fifth divided plate 550.

[0091] Therefore, according to the configuration (4) above, when attaching the blade ring 111 to the seal ring retaining ring 40, it is possible to reduce the risk that the protruding portions (leg portions 34) will get caught on and ride up the fifth divided plate 550, thereby shortening the time required to integrate the seal ring retaining ring 40 and the blade ring 111. This allows the assembly work of the turbine 3 to be carried out efficiently.

[0092] (5) In some embodiments, in the configuration of (4) above, the fifth divided plate 550 may be positioned between a position 30 degrees away from the center position of the seal ring retaining ring 40 in the circumferential direction Dc to one side of the circumferential direction Dc and a position 30 degrees away from the center position of the seal ring retaining ring 40 in the circumferential direction Dc to the other side of the circumferential direction Dc.

[0093] After careful consideration, the inventors found that the area where there is a relatively high risk of the protrusion (leg 34) getting caught on the dividing plate 50 and riding up when attaching the blade ring 111 to the seal ring retaining ring 40 is near a position 45 degrees away from the center position of the seal ring retaining ring 40 in the circumferential direction Dc to one side or the other in the circumferential direction Dc. According to the configuration (5) above, the divided plate 50 of the first divided plate group 501 or the second divided plate group 502, rather than the fifth divided plate 550, is positioned in an area where there is a relatively high risk that the protrusion (leg portion 34) will get caught on and ride up on the divided plate 50 when attaching the blade ring 111 to the seal ring retaining ring 40, thereby reducing the above risk.

[0094] (6) In some embodiments, in any of the configurations (1) to (5) above, the first overlapping portion 511 on one side and the second overlapping portion 522 on the other side may be shiplap-joined so that they can be separated from each other.

[0095] According to the above configuration (6), the sealing performance between the first overlapping portion 511 on one side and the second overlapping portion 522 on the other side can be improved with a relatively simple structure.

[0096] (7) In some embodiments, in any of the configurations (1) to (6) above, the multiple dividing plates 50 may be arranged in the circumferential direction Dc from one end of the seal ring retaining ring 40 in the circumferential direction Dc to the other end.

[0097] According to the configuration (7) above, the risk of the protrusions (legs 34) getting caught on and riding up the dividing plates 50 when attaching the blade ring 111 to the seal ring retaining ring 40 can be reduced over the entire circumferential direction Dc of the seal ring retaining ring 40.

[0098] (8) In some embodiments, in any of the configurations (1) to (7) above, the turbine blade ring assembly 110 may be the upper half portion (upper half portion 110U) of the turbine blade ring 105.

[0099] When the upper half 111U of the blade ring 111 holding the plurality of stator blades 31 is attached from the radially outer side of the upper half 40U of the seal ring retaining ring 40 that holds the plurality of divided plates 50 arranged in the circumferential direction Dc, the blade stages are located on one side and the other side in the axial direction Da across the upper half 40U of the seal ring retaining ring 40. Therefore, if the protruding portion (leg portion 34) gets caught on the divided plate 50, the blade row gets in the way, making correction difficult. According to the configuration (8) above, when installing the upper half 111U of the blade ring 111, which is difficult to correct as described above, the risk of the protruding portion (leg portion 34) getting caught on and riding up the dividing plate 50 can be reduced, and the effect of reducing this risk is even greater.

[0100] (9) A turbine assembly method according to at least one embodiment of the present disclosure includes a step (S5) of attaching a seal ring retainer ring upper half (upper half 40U) including a plurality of divided plates 50 arranged in the circumferential direction Dc and a plurality of biasing springs 75 that bias the plurality of divided plates 50 in the axial direction Da to a turbine blade ring lower half (lower half 110D) that includes a blade ring 111 that holds a plurality of stator vanes 31 and a seal ring retainer ring 40, to a casing lower half 5D. The turbine assembly method according to at least one embodiment of the present disclosure includes a step (S7) of attaching a blade ring upper half (upper half 111U) that holds a plurality of stator vanes 31 to the seal ring retainer ring upper half (upper half 40U) that is attached to the casing lower half 5D. The plurality of stator vanes 31 included in the blade ring upper half (upper half 111U) have protrusions (legs 34) that protrude radially inward. The plurality of biasing springs 75 provided in the seal ring retaining ring upper half (upper half 40U) bias the plurality of divided plates 50 provided in the seal ring retaining ring upper half (upper half 40U) to abut against the protrusions (leg portions 34). The plurality of divided plates 50 provided in the seal ring retaining ring upper half (upper half 40U) include a first divided plate group 501, a plurality of which are arranged in the circumferential direction Dc on one side of the seal ring retaining ring 40 in the circumferential direction Dc, and a second divided plate group 502, a plurality of which are arranged in the circumferential direction Dc on the other side of the seal ring retaining ring 40 in the circumferential direction Dc. The plurality of divided plates 50 constituting the first divided plate group 501 include a first divided plate 510 and a second divided plate 520, which is arranged at a position closer to an end of one side of the seal ring retaining ring 40 in the circumferential direction Dc than the first divided plate 510 and is adjacent to the first divided plate 510 in the circumferential direction Dc. The first divided plate 510 has a one-side first overlapping portion 511 that overlaps with the second divided plate 520 in the circumferential direction Dc. The second divided plate 520 has an other-side second overlapping portion 522 that overlaps with the one-side first overlapping portion 511 in the circumferential direction Dc. The one-side first overlapping portion 511 abuts against the other-side second overlapping portion 522 when the first divided plate 510 is biased by the biasing spring 75. The multiple divided plates 50 that make up the second divided plate group 502 include a third divided plate 530 and a fourth divided plate 540 that is positioned closer to the other end of the seal ring retainer ring 40 in the circumferential direction Dc relative to the third divided plate 530 and is adjacent to the third divided plate 530 in the circumferential direction Dc. The third divided plate 530 has an other-side third overlapping portion 532 that overlaps with the fourth divided plate 540 in the circumferential direction Dc.The fourth divided plate 540 has a one-side fourth overlapping portion 541 that overlaps with the other-side third overlapping portion 532 in the circumferential direction Dc. The other-side third overlapping portion 532 comes into contact with the one-side fourth overlapping portion 542 when the third divided plate 530 is biased by the biasing spring 75.

[0101] According to the method (9) described above, in the step (S7) of attaching the blade ring upper half (upper half 111U), the protruding portion (leg portion 34) of the first divided plate group 501 presses the second divided plate 520, which is located near one end of the seal ring retaining ring 40 in the circumferential direction Dc, in the axial direction Da before the first divided plate 510. Here, the one-side first overlapping portion 511 abuts against the other-side second overlapping portion 522 as the first divided plate 510 is biased by the biasing spring 75. Therefore, when the protruding portion (leg portion 34) presses and moves the second divided plate 520 in the axial direction Da against the biasing force of the biasing spring 75, the other-side second overlapping portion 522 presses the one-side first overlapping portion 511 in the axial direction Da. This reduces the risk of the protruding portion (leg portion 34) getting caught on and riding up the first divided plate 510.

[0102] Furthermore, according to the method (9) described above, in the step (S7) of attaching the blade ring upper half (upper half 111U), for the second divided plate group 502, the protruding portion (leg portion 34) presses the fourth divided plate 540, which is located near the other end of the seal ring retaining ring 40 in the circumferential direction Dc, in the axial direction Da before the third divided plate 530. Here, the other-side third overlapping portion 532 abuts against the one-side fourth overlapping portion 541 due to the third divided plate 530 being biased by the biasing spring 75. Therefore, when the protruding portion (leg portion 34) presses and moves the fourth divided plate 540 in the axial direction Da against the biasing force of the biasing spring 75, the one-side fourth overlapping portion 541 presses the other-side third overlapping portion 532 in the axial direction Da. This reduces the risk of the protruding portion (leg portion 34) getting caught on and riding up the third divided plate 530.

[0103] Therefore, according to the method (9) described above, the risk of the protruding portion (leg portion 34) getting caught on and riding up on the dividing plate 50 in the step (S7) of attaching the blade ring upper half portion (upper half portion 111U) can be reduced, and the time required to perform the step (S7) of attaching the blade ring upper half portion (upper half portion 111U) can be shortened. This allows the assembly work of the turbine 3 to be carried out efficiently. [Explanation of symbols]

[0104] 3 Turbine 5D Lower cabin 31 Stator blade 34 Legs (protrusions) 40 Seal ring retainer 40D lower half 40U upper half 50 split plate 51 Overlapping section 51a One side overlap 51b Overlapping part on other side 51c One-side overlap 51d Other side overlapping part 75 bias spring 100 Gas Turbine 105 Turbine blade ring 110 Turbine blade ring assembly 110D lower half 110U upper half 111 Wing ring 111D lower half 111U upper half 501 1st division plate group 502 2nd division plate group 510 1st division plate 511 First overlapping part on one side 512 First overlapping part on the other side 520 Second division plate 521 Second overlapping part on one side 522 Second overlapping part on other side 530 Third division plate 531 Third overlapping part on one side 532 Third overlapping part on other side 540 4th division plate 541 Fourth overlapping part on one side 542 4th overlapping part on other side 550 5th division plate 551 One side fifth overlapping section 552 Other side 5th overlapping part

Claims

1. a blade ring having an arc shape; a plurality of stator blades held by the blade ring; a seal ring retaining ring having an arc shape; a plurality of divided plates arranged in a circumferential direction and held by the seal ring retaining ring; a plurality of biasing springs that bias the plurality of divided plates in the axial direction; Equipped with The plurality of stator vanes each have a protruding portion protruding radially inward, the plurality of biasing springs bias the plurality of divided plates to abut against the protrusions, The plurality of dividing plates are a first divided plate group including a plurality of divided plates arranged in the circumferential direction on one side of the seal ring retaining ring in the circumferential direction; a second divided plate group including a plurality of divided plates arranged in the circumferential direction on the other side of the seal ring retaining ring in the circumferential direction; Including, The plurality of divided plates constituting the first divided plate group are A first dividing plate; a second divided plate disposed at a position closer to the one end of the seal ring retaining ring in the circumferential direction relative to the first divided plate and adjacent to the first divided plate in the circumferential direction; Including, the first divided plate has a first overlapping portion on one side that overlaps with the second divided plate in the circumferential direction, the second divided plate has an other-side second overlapping portion that overlaps the one-side first overlapping portion in the circumferential direction, the first overlapping portion on one side comes into contact with the second overlapping portion on the other side when the first divided plate is biased by the biasing spring; The plurality of divided plates constituting the second divided plate group are A third dividing plate; a fourth divided plate disposed at a position closer to the other end of the seal ring retaining ring in the circumferential direction relative to the third divided plate and adjacent to the third divided plate in the circumferential direction; Including, the third divided plate has a third overlapping portion on the other side that overlaps with the fourth divided plate in the circumferential direction, the fourth divided plate has a one-side fourth overlapping portion that overlaps with the other-side third overlapping portion in the circumferential direction, the other-side third overlapping portion abuts against the one-side fourth overlapping portion when the third divided plate is biased by the biasing spring; At least one of the first divided plates has a shape that is plane-symmetrical to at least one of the third divided plates. Turbine blade ring assembly.

2. A blade ring having an arc shape; a plurality of stator blades held by the blade ring; a seal ring retaining ring having an arc shape; a plurality of divided plates arranged in a circumferential direction and held by the seal ring retaining ring; a plurality of biasing springs that bias the plurality of divided plates in the axial direction; Equipped with The plurality of stator vanes each have a protruding portion protruding radially inward, the plurality of biasing springs bias the plurality of divided plates to abut against the protrusions, The plurality of dividing plates are a first divided plate group including a plurality of divided plates arranged in the circumferential direction on one side of the seal ring retaining ring in the circumferential direction; a second divided plate group including a plurality of divided plates arranged in the circumferential direction on the other side of the seal ring retaining ring in the circumferential direction; Including, The plurality of divided plates constituting the first divided plate group are A first dividing plate; a second divided plate disposed at a position closer to the one end of the seal ring retaining ring in the circumferential direction relative to the first divided plate and adjacent to the first divided plate in the circumferential direction; Including, the first divided plate has a first overlapping portion on one side that overlaps with the second divided plate in the circumferential direction, the second divided plate has an other-side second overlapping portion that overlaps the one-side first overlapping portion in the circumferential direction, the first overlapping portion on one side comes into contact with the second overlapping portion on the other side when the first divided plate is biased by the biasing spring; The plurality of divided plates constituting the second divided plate group are A third dividing plate; a fourth divided plate disposed at a position closer to the other end of the seal ring retaining ring in the circumferential direction relative to the third divided plate and adjacent to the third divided plate in the circumferential direction; Including, the third divided plate has a third overlapping portion on the other side that overlaps with the fourth divided plate in the circumferential direction, the fourth divided plate has a one-side fourth overlapping portion that overlaps with the other-side third overlapping portion in the circumferential direction, the other-side third overlapping portion abuts against the one-side fourth overlapping portion when the third divided plate is biased by the biasing spring; the plurality of divided plates includes a fifth divided plate disposed between the first divided plate and the third divided plate, the fifth divided plate has a one-side fifth overlapping portion that overlaps with the first divided plate in the circumferential direction and a second-side fifth overlapping portion that overlaps with the third divided plate in the circumferential direction, the first divided plate has a first overlapping portion on the other side that overlaps with the fifth divided plate in the circumferential direction, the third divided plate has a third overlapping portion on one side that overlaps with the fifth divided plate in the circumferential direction, the fifth overlapping portion on one side comes into contact with the first overlapping portion on the other side when the fifth divided plate is biased by the biasing spring; the other-side fifth overlapping portion abuts against the one-side third overlapping portion when the fifth divided plate is biased by the biasing spring; Turbine blade ring assembly.

3. At least one of the first divided plates has a shape that is plane-symmetrical to at least one of the third divided plates. The turbine blade ring assembly of claim 2 .

4. the plurality of divided plates includes a fifth divided plate disposed between the first divided plate and the third divided plate, the fifth divided plate has a one-side fifth overlapping portion that overlaps with the first divided plate in the circumferential direction and a second-side fifth overlapping portion that overlaps with the third divided plate in the circumferential direction, the first divided plate has a first overlapping portion on the other side that overlaps with the fifth divided plate in the circumferential direction, the third divided plate has a third overlapping portion on one side that overlaps with the fifth divided plate in the circumferential direction, the fifth overlapping portion on one side comes into contact with the first overlapping portion on the other side when the fifth divided plate is biased by the biasing spring; the other-side fifth overlapping portion abuts against the one-side third overlapping portion when the fifth divided plate is biased by the biasing spring; The turbine blade ring assembly of claim 1 .

5. The fifth divided plate is disposed between a position 30 degrees away from the circumferential center position of the seal ring retaining ring to one side in the circumferential direction and a position 30 degrees away from the other side in the circumferential direction. The turbine blade ring assembly of claim 4 .

6. At least one of the first divided plates has the same shape as at least one of the second divided plates, At least one of the third divided plates has the same shape as at least one of the fourth divided plates. A turbine blade ring assembly according to any one of claims 1 to 5.

7. The first overlapping portion on one side and the second overlapping portion on the other side are shiplap-joined so as to be separable from each other. A turbine blade ring assembly according to any one of claims 1 to 5.

8. The plurality of divided plates are arranged in the circumferential direction from the one end of the seal ring retaining ring to the other end of the seal ring retaining ring. A turbine blade ring assembly according to any one of claims 1 to 5.

9. the turbine blade ring assembly is an upper half portion of a turbine blade ring; A turbine blade ring assembly according to any one of claims 1 to 5.

10. A method for assembling a turbine having a turbine blade ring assembly according to any one of claims 1 to 5, comprising: a step of attaching a seal ring retaining ring upper half, which includes a plurality of divided plates arranged in a circumferential direction and a plurality of biasing springs that bias the plurality of divided plates in an axial direction, to a lower half of a turbine casing to which a turbine blade ring lower half is attached, the turbine blade ring lower half including a blade ring that holds a plurality of stator blades and a seal ring retaining ring; attaching an upper half of a blade ring, which holds the plurality of stator vanes, to an upper half of the seal ring retaining ring attached to the lower half of the casing; Equipped with How to assemble a turbine.

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