JP6302368B2 - Stator blades and vane units, steam turbines - Google Patents

Description

  The present invention has a stationary blade applied to a rotary machine or the like, a stationary blade unit in which an outer ring and an inner ring are connected by a plurality of stationary blades arranged at predetermined intervals in the circumferential direction, and a plurality of stationary blades and a plurality of moving blades. The present invention relates to a steam turbine that drives and rotates a rotor using steam.

  In a general steam turbine, a rotor, which is a rotating shaft, is rotatably supported by a casing, and a moving blade is provided on the outer periphery of the rotor, while a stationary blade is provided on the casing, and a stationary blade and a moving blade are provided in a steam passage. A plurality of stages are arranged. Therefore, when the steam flows through the steam passage, the steam is rectified by the stationary blade, and the rotor can be driven and rotated through the moving blade.

  In such a steam turbine, a stationary blade generally has a shroud fixed to a base end portion, and a split ring is fixed to a distal end portion. The integrated stationary blade, shroud, and split ring are in a ring shape. The vane unit is assembled. The stationary blade is fixed by fillet welding with the base end in contact with the shroud, and is fixed by fillet welding with the tip in contact with the split ring. However, if the stationary blade and the shroud, and the stationary blade and the split ring are fixed by fillet welding, the fillet welded portion is positioned on the steam passage side, which may hinder the steam flow.

  Therefore, it has been proposed to penetrate the base end portion of the stationary blade through the shroud, penetrate the distal end portion of the stationary blade through the split ring, and fix each through portion by groove welding. In addition, as what penetrates each edge part of a stationary blade through a shroud or a division | segmentation ring and is fixed by welding, there exist some which were described in the following patent document 1, for example. Moreover, as what fixes each edge part of a stationary blade with respect to a shroud or a division | segmentation ring by groove welding, there exist some which were described in the following patent document 2, for example.

JP-A-10-184111 Japanese Utility Model Publication No. 05-017101 JP 2008-032001 A

  As described above, when the end of the stationary blade is passed through the shroud or the split ring and this through portion is fixed by groove welding, it is necessary to form a through hole through which the end of the stationary blade passes through the shroud or the split ring. There is. However, since the stationary blade has a three-dimensional shape in which the outer surface has a curved shape and is twisted in the circumferential direction, the through-hole formed in the shroud or the split ring is larger than the size of the end portion of the stationary blade. It will be big. Then, a large gap is generated between the outer surface of the end portion of the stationary blade and the inner surface of the through hole in the shroud or the split ring, and groove welding becomes difficult. In addition, although dividing | segmenting a platform into 2 is described in patent document 3, it is the structure which a stator blade and a division | segmentation platform make an integral structure, and engages with an adjacent platform, This adjacent platform They are not welded together.

  SUMMARY OF THE INVENTION The present invention solves the above-described problems, and improves the performance by suppressing the protruding portion to the passage side and facilitates the assembly to improve the workability, the stationary blade unit, and the steam turbine. The purpose is to provide.

  In order to achieve the above object, a stationary blade of the present invention includes a stationary blade body and a support member to which an end portion of the stationary blade body passes and is fixed, and the support member includes the stationary blade. It is composed of a plurality of divided bodies arranged around the end of the main body, and a welded portion is provided between the plurality of divided bodies, and is opened between the end of the stationary blade body and the divided bodies. A pre-welded part is provided.

  Accordingly, the stationary blade has a plurality of divided bodies arranged around the end portion of the stationary blade body, the plurality of divided bodies are connected to each other by the welded portion, and the end portion of the stationary blade body and each divided body are grooved. They are connected by welding. By configuring the support member from a plurality of divided bodies, even if the stationary blade body has a curved shape and a three-dimensional shape twisted in the circumferential direction, the end of the stationary blade body and each divided body can be connected without gaps. It can be connected properly. And since groove welding can be implemented, the protrusion of the welding part to the channel | path side is suppressed and a steam flow is not prevented. As a result, it is possible to improve the performance by suppressing the protruding portion to the passage side, and to improve the workability by facilitating the assembly.

  In the stationary blade of the present invention, the plurality of divided bodies are characterized in that a groove portion is provided at a connection portion with the stationary blade body.

  Therefore, it is possible to provide a groove portion of an optimal shape at the connecting portion of each divided body with the stationary blade body in accordance with the outer surface shape of the stationary blade body, and to appropriately weld the groove to the stationary blade body and the divided body. it can.

  In the stationary blade of the present invention, the plurality of divided bodies are characterized in that a connecting portion with the adjacent support member is provided on a surface opposite to the groove portion.

  Therefore, the stationary blades configured by connecting the end portion of the stationary blade body and each divided body by groove welding are the supporting members adjacent to the connecting portion provided on the opposite side of the groove portion, that is, the stationary blades. The stator blades (support members) can be connected with high accuracy.

  In the stationary blade of the present invention, the plurality of divided bodies include a first divided body disposed on the back side of the stationary blade body, a second divided body disposed on the ventral side of the stationary blade body, and the static body. It has the 3rd division body arrange | positioned at the rear-edge part side of a wing | blade main body, It is characterized by the above-mentioned.

  Accordingly, the first divided body disposed on the back side of the stationary blade body, the second divided body disposed on the ventral side of the stationary blade body, and the third divided body disposed on the rear edge portion side of the stationary blade body. Assembling property can be improved by constituting a divided body.

  In the stationary blade of the present invention, the third divided body is provided with a V-shaped portion including two connecting portions, and a non-groove welded portion is provided at an intersection of the two connecting portions. It is said.

  Therefore, since the end portion of the stationary blade and the intersection of the V-shaped portion in the third divided body are not groove-welded, shape deformation is suppressed by the welding heat of the trailing edge portion at the end portion of the stationary blade body. Can do.

  The stationary blade according to the present invention is characterized in that an end portion of the stationary blade body is disposed so as to protrude from the support member.

  Therefore, when manufacturing the stationary blade body, it is not necessary to set the length with high accuracy, and the manufacturing cost can be reduced.

  In the stator blade according to the present invention, the stator blade main body is provided with a hollow portion penetrating in a longitudinal direction, and a drain passage communicating with the hollow portion is provided at an end portion penetrating the support member.

  Therefore, by providing the drain passage in communication with the hollow portion of the stationary blade body, the drain water generated in the hollow portion of the stationary blade body can be easily discharged from the drain passage.

  Moreover, the stationary blade unit of the present invention is characterized in that the stationary blade is assembled in a ring shape by connecting the support members.

  Accordingly, the stationary blade has a plurality of divided bodies arranged around the end portion of the stationary blade body, the plurality of divided bodies are connected to each other by the welded portion, and the end portion of the stationary blade body and each divided body are grooved. They are connected by welding. By configuring the support member from a plurality of divided bodies, even if the stationary blade has a curved shape and a three-dimensional shape that is twisted in the circumferential direction, the end of the stationary blade body and each divided body are properly arranged without gaps. Can be linked to. And since groove welding can be implemented, the protrusion of the welding part to the channel | path side is suppressed and a steam flow is not prevented. Moreover, a stationary blade unit can be easily configured by assembling a plurality of stationary blades into a ring shape. As a result, it is possible to improve the performance by suppressing the protruding portion to the passage side, and to improve the workability by facilitating the assembly.

  The steam turbine according to the present invention includes a casing, a rotor rotatably supported in the casing, and a plurality of base end portions of the moving blades supported by the rotor and arranged at predetermined intervals in the circumferential direction of the rotor. A plurality of stages of moving blade units, and a plurality of stages of stationary blade moving blade units that are supported by the casing and arranged at a predetermined interval in the circumferential direction of the rotor. However, the stationary blade unit is applied as a final-stage stationary blade unit among the plurality of stages of stationary blade units.

  Therefore, it is possible to improve the performance by suppressing the protruding portion to the passage side, and to improve the workability by facilitating the assembly.

  According to the stationary blade, the stationary blade unit, and the steam turbine of the present invention, the stationary blade body is configured from a supporting member that is fixed by penetrating the stationary blade body, and the supporting member is configured by a plurality of divided bodies. Since the welded portion is provided between the plurality of divided bodies and the groove welded portion is provided between the end portion of the stationary blade body and the divided body, the projecting portion to the passage side is suppressed and the performance is improved. In addition, it is possible to improve the workability by facilitating the assembly.

FIG. 1 is a schematic diagram illustrating a stationary blade unit in the steam turbine of the present embodiment. FIG. 2 is a schematic diagram illustrating a disassembled state of the stationary blade. FIG. 3 is a schematic view showing an assembled state of the stationary blade. FIG. 4 is a cross-sectional view illustrating a connecting portion between the stationary blade and the split ring. FIG. 5 is a schematic configuration diagram illustrating the steam turbine of the present embodiment.

  Exemplary embodiments of a stationary blade, a stationary blade unit, and a steam turbine according to the present invention will be described below in detail with reference to the accompanying drawings. In addition, this invention is not limited by this embodiment, and when there are two or more embodiments, what comprises combining each embodiment is also included.

  FIG. 5 is a schematic configuration diagram illustrating the steam turbine of the present embodiment.

  In the steam turbine, as shown in FIG. 5, the casing 11 has a hollow shape, and the rotor 12 is rotatably supported by a plurality of bearings 13. In the rotor 12, a plurality of blade units 14 are provided at predetermined intervals in the axial direction on the outer peripheral portion inside the casing 11. The blade unit 14 includes a plurality of disks 15 provided at predetermined intervals in the axial direction on the outer periphery of the rotor 12 and a plurality of blades 16 fixed to the outer periphery of each disk 15 along the circumferential direction. Has been.

  The casing 11 is provided with a plurality of stationary blade units 17 at predetermined intervals in the axial direction of the rotor 12. The stationary blade unit 17 is fixed along the circumferential direction so as to connect a plurality of outer rings 18 and inner rings 19 arranged at predetermined intervals in the axial direction on the outer peripheral portion of the rotor 12, and the outer rings 18 and the inner rings 19. The plurality of stationary blades 20 are configured. Thus, the moving blade units 14 and the stationary blade units 17 are alternately arranged in the axial direction of the rotor 12.

  Further, the casing 11 has a steam passage 21 formed in a passage in which the plurality of moving blade units 14 and the plurality of stationary blade units 17 are disposed. The casing 11 is provided with a steam supply port 22 and a steam discharge port 23 that communicate with the steam passage 21.

  Therefore, when steam is supplied from the steam supply port 22 to the steam passage 21, the steam passes through the plurality of blade units 14 and the stationary blade unit 17, thereby passing through the rotor 12 via each blade unit 14. It can be driven and rotated. The rotor 12 is connected to a generator (not shown), and can drive the generator to generate power.

  In the present embodiment, as shown in FIG. 1, the stationary blade 20 includes a stationary blade body 31, a split ring (support member) 32 to which a tip portion of the stationary blade body 31 is fixed, and a stationary blade. A base end portion of the main body 31 has a shroud (supporting member) 33 that passes through and is fixed. Then, the outer ring 18 is configured by connecting the plurality of split rings 32 in a ring shape, and the inner ring 19 is configured by connecting the plurality of shrouds 33 in a ring shape. The stationary blade 20 is assembled in a ring shape.

  And the division | segmentation ring 32 and the shroud 33 are comprised from the some division body, and while the some division body is connected by laser welding, the edge part of the stationary blade main body 31 and each division body are connected by groove welding. Is done.

  That is, as shown in FIG. 2, in the connection structure between the tip of the stationary blade body 31 and the split ring 32, the stationary blade body 31 is welded to the back side plate 41 and the abdominal side plate 42 formed by sheet metal pressing. More connected. The back side plate 41 and the abdominal side plate 42 are connected to each front edge portion by welding to provide a front edge weld portion 43, and each rear edge portion is connected to each other by welding to provide a rear edge weld portion 44. The stationary blade body 31 is configured to have a blade shape. Here, the stationary blade body 31 may be manufactured by casting or cutting, for example, in addition to manufacturing by sheet metal.

  The split ring 32 includes a first divided body 51 disposed on the back plate 41 side in the stationary blade body 31, a second divided body 52 disposed on the ventral plate 42 side in the stationary blade body 31, and the stationary blade body. 31 and a third divided body 53 disposed on the rear edge portion 31a side. The first divided body 51 is concavely curved along the front edge portion side of the back side plate 41 to form a first connecting portion 51a, and obliquely with respect to the thickness direction of the first connecting portion 51a. A first groove 51b to be formed is formed. The second divided body 52 is curved in a convex shape along the front edge portion side of the ventral plate 42 to form a second connecting portion 52a, and is inclined with respect to the thickness direction of the second connecting portion 52a. A second groove portion 52b is formed. The third divided body 53 is provided with a V-shaped portion 54 including two third connecting portions 53a and 53b along the rear edge portion 31a side of the back side plate 41 and the ventral side plate 42. Third groove portions 53c and 53d formed obliquely with respect to the thickness direction of the coupling portions 53a and 53b are formed. Note that the third connecting portions 53a and 53b have third groove portions 53c and 53d formed partway, and a groove portion is formed at the intersecting portion 54a of the V-shaped portion 54 corresponding to the rear edge portion 41a. Absent.

  The first divided body 51 and the second divided body 52 are formed with connecting surfaces 55a and 56a at opposing positions, and the first divided body 51 and the third divided body 53 are formed with connecting surfaces 55b and 57a at opposed positions. In addition, the second divided body 52 and the third divided body 53 have connection surfaces 56b and 57b formed at opposing positions. Moreover, the 1st division body 51 has the connection surfaces 55c and 55d with the division | segmentation ring 32 adjacent on the opposite side to the 1st groove part 51b. In the second divided body 52, a connection surface 56c with the adjacent split ring 32 is formed on the side opposite to the second groove portion 52b, and the connection surfaces 56b and 56c are linearly provided. The third split body 53 is formed with a connecting surface 57c with the split ring 32 adjacent to the third groove portions 53c and 53d, and the split ring adjacent to the opposite side of the third groove portions 53c and 53d. The connection surfaces 57d and 57e with 32 are formed. In addition, as for the 3rd division body 53, the connection surfaces 57a and 57c are provided in linear form.

  As shown in FIGS. 3 and 4, the stationary blade 20 has the divided bodies 51, 52, 53 arranged around the end portion of the stationary blade body 31, and the plurality of divided bodies 51, 52, 53 are connected to each other. While being connected by laser welding, the end part of the stationary blade body 31 and each divided body 51, 52, 53 are connected by groove welding. That is, in the stationary blade 20, the connection portions 51 a, 52 a, 53 a, and 53 b of the divided bodies 51, 52, and 53 are in close contact with the outer peripheral surface of the end portion of the stationary blade body 31. Further, the first divided body 51 and the second divided body 52 are in close contact with each other through the connecting surfaces 55a and 56a, and the first divided body 51 and the third divided body 53 are in close contact with each other through the connecting surfaces 55b and 57a. 52 and the 3rd division body 53 adhere | attach by connection surface 56b, 57b.

  In this state, the connection surfaces 55a and 56a of the first divided body 51 and the second divided body 52 are connected by laser welding (laser welding portion 61), and the first divided body 51 and the third divided body 53 are connected to each other. 55b and 57a are connected by laser welding (laser welding part 62), and the connection surfaces 56b and 57b of the second divided body 52 and the third divided body 53 are connected by laser welding (laser welding part 63). Moreover, the outer peripheral surface of the stationary blade body 31 and the first groove portion 51b of the first divided body 51 are connected by groove welding (groove welding portion 71). The outer peripheral surface of the stationary blade body 31 and the second groove portion 52b of the second divided body 52 are connected by groove welding (groove welding portion 72). The outer peripheral surface of the stationary blade body 31 and the third groove portions 53c and 53d of the third divided body 53 are connected by groove welding (groove weld portions 73 and 74). At this time, the rear edge portion 31a of the stationary blade body 31 and the intersecting portion 54a of the third divided body 53 are not groove-welded, and the non-groove weld portion 75 is provided.

  The split ring 32 to which the respective divided bodies 51, 52, 53 are connected is connected in a plurality of rings to form the outer ring 18. That is, the first divided body 51 is connected to the second divided body 52 of the divided ring 32 adjacent to one side and the connection surfaces 55c and 56c by close contact, and is connected by welding, and the third divided body 53 and the connection surface 55c, 57e comes into close contact and is connected by welding. In the second divided body 52, the first divided body 51 and the connecting surfaces 55c, 56c of the divided ring 32 adjacent to the other side are in close contact with each other and connected by welding. In the third divided body 53, the third divided body 53 of the divided ring 32 adjacent to one side and the connection surfaces 57c, 57d are in close contact and connected by welding, and the third divided body 53 of the divided ring 32 adjacent to the other side is connected. And the connecting surfaces 57c and 57d are in close contact and connected by welding, and the first divided body 51 and the connecting surfaces 55d and 57e are in close contact and connected by welding.

  Here, the various welding which connects the stationary blade body 31 and each division body 51,52,53 is implemented from the steam channel 21 (refer FIG. 1) side.

  Further, as shown in FIG. 1, the stationary blade 20 has an end portion of the stationary blade body 31 that passes through the split ring 32 (outer ring 18), protrudes a predetermined length, and is fixed to the split ring 32. The split ring 32 has a box shape in which the lid plate 81 is fixed by a plurality of bolts 82 via the flange portions 32 a on both sides, and the end portion of the stationary blade body 31 is in contact with the lid plate 81. The lid plate 81 is provided with a drain passage 83. The stationary blade body 31 is provided with a hollow portion 45 penetrating in the longitudinal direction, and the hollow portion 45 communicates with the drain passage 83 through a through hole 81 a formed in the lid plate 81.

  Here, the connection structure between the distal end portion of the stationary blade body 31 and the split ring 32 in the stationary blade 20 has been described, but the connection structure between the proximal end portion of the stationary blade body 31 and the shroud 33 is substantially the same. It becomes the composition of.

  As described above, in the stationary blade of the present embodiment, the stationary blade main body 31 is the stationary blade 20 that is configured such that the end portion of the stationary blade body 31 penetrates and is fixed to the split ring 32 (the shroud 33). The plurality of divided bodies 51, 52, 53 are arranged around the end of the stationary blade body 31, and laser welded portions 61, 62, 63 are provided between the plurality of divided bodies 51, 52, 53. In addition, groove welds 71, 72, 73, 74 are provided between the end of the stationary blade body 31 and the divided bodies 51, 52, 53.

  Accordingly, by forming the split ring 32 from the plurality of split bodies 51, 52, 53, even if the stationary blade body 31 has a curved shape and a three-dimensional shape twisted in the circumferential direction, the stationary blade body 31 The end portions of the stationary blade main body 31 and the respective divided bodies 51, 52, 53 can be connected to each other with high accuracy. And since the edge part of the stationary blade body 31 and each division | segmentation body 51,52,53 contact | adhere closely, groove welding can be implemented between both, and the groove welding part to the steam channel 21 side is carried out. The protrusion of 71, 72, 73, 74 can be suppressed, and the steam flow flowing through the steam passage 21 is not hindered. As a result, it is possible to improve the performance of the stationary blade 20 by suppressing the protruding amount of the groove welds 71, 72, 73, 74 to the steam passage 21 side, and to facilitate the assembly of the stationary blade 20. Can be improved.

  In the stationary blade of the present embodiment, groove portions 51b, 52b, 53c, and 53d are provided in the connecting portions 51a, 52a, 53a, and 53b of the plurality of divided bodies 51, 52, and 53 with the stationary blade body 31. Therefore, the groove portions 51b, 52b, 53c, 53d of the optimum shape are connected to the connecting portions 51a, 52a, 53a, 53b of the divided bodies 51, 52, 53 with the stationary blade body 31 according to the outer surface shape of the stationary blade body 31. Can be provided, and the stator blade body 31 and the divided bodies 51, 52, 53 can be groove-welded with high accuracy.

  In the stationary blade of the present embodiment, the connecting surfaces 55b, 55c, 56c, 57c with the adjacent split ring 32 on the opposite side to the groove portions 51b, 52b, 53c, 53d in the plurality of split bodies 51, 52, 53. , 57d, 57e. Therefore, the stationary blade 20 configured by connecting the divided bodies 51, 52, 53 to the end portion of the stationary blade body 31 by groove welding is provided via the connection surfaces 55b, 55c, 56c, 57c, 57d, 57e. It will be connected with the division | segmentation ring 32 of the adjacent stator blade 20, and each stator blade 20 (each division | segmentation ring 32) can be connected with high precision.

  In the stationary blade of the present embodiment, as a plurality of divided bodies, a first divided body 51 disposed on the back side of the stationary blade body 31, a second divided body 52 disposed on the ventral side of the stationary blade body 31, A third divided body 53 disposed on the rear edge portion 31a side of the stationary blade body 31 is provided. Therefore, the three divided bodies 51, 52, and 53 can be appropriately brought into close contact with the end of the stationary blade body 31 having a three-dimensional shape, and the assemblability can be improved.

  In the stationary blade of the present embodiment, the V-shaped portion 54 including the two connecting portions 53a and 53b is provided in the third divided body 53, and the non-groove welded portion is provided at the intersecting portion 54a of the two connecting portions 53a and 53b. 75 is provided. Accordingly, since the end portion of the stationary blade body 31 and the intersecting portion 54a of the V-shaped portion 54 in the third divided body 53 are not groove-welded, the welding heat of the trailing edge portion 31a at the end portion of the stationary blade body 31 Therefore, shape deformation (melting) can be suppressed.

  In the stationary blade of the present embodiment, the end portion of the stationary blade body 31 is disposed so as to protrude from the split ring 32 (the shroud 33). Therefore, it is only necessary to fix each of the divided bodies 51, 52, 53 at a predetermined position in the length direction of the end portion of the stationary blade body 31, and it is not necessary to position the end portion of the stationary blade body 31. The stationary blade body 31 is manufactured by connecting the back side plate 41 and the abdominal side plate 42 formed by sheet metal press working by welding. At this time, the length of each plate 41, 42 is manufactured with high accuracy. It is not necessary to reduce the manufacturing cost.

  In the stationary blade of the present embodiment, a hollow portion 45 penetrating in the longitudinal direction is provided in the stationary blade body 31, and a drain passage 83 communicating with the hollow portion 45 is provided at an end portion that penetrates the split ring 32. Accordingly, the drain passage 83 is provided so as to communicate with the hollow portion 45 of the stationary blade body 31, so that drain water generated in the hollow portion 45 of the stationary blade body 31 is easily discharged from the drain passage 83 to the outside. be able to.

  In the stationary blade unit of the present embodiment, the plurality of split rings 32 are connected in a ring shape to form the outer ring 18, and the plurality of shrouds 33 are connected in a ring shape to form the inner ring 19, and the stationary blade 20. Is configured as a ring shape, and the split ring 32 (the shroud 33) is configured by a plurality of split bodies 51, 52, 53. Therefore, the end portion of the stationary blade body 31 and each of the divided bodies 51, 52, 53 can be properly adhered without gaps, and the end portion of the stationary blade body 31 and each of the divided bodies 51, 52, 53 are connected with high accuracy. can do. And the edge part of the stationary blade main body 31 and each division body 51,52,53 can be connected by groove welding, and the protrusion of the groove welding parts 71,72,73,74 to the steam channel 21 side is made. It can suppress and does not disturb the steam flow which flows through the steam passage 21. As a result, it is possible to improve the performance of the stationary blade 20 by suppressing the protruding amount of the groove welds 71, 72, 73, 74 to the steam passage 21 side, and to facilitate the assembly of the stationary blade 20. Can be improved.

  Further, in the steam turbine of the present embodiment, the casing 11, the rotor 12 rotatably supported in the casing 11, and the base end portion of the moving blade 16 are supported by the rotor 12, so that the circumferential direction of the rotor 12 is A plurality of stages of moving blade units 14 arranged at a predetermined interval on each other, and a plurality of stages arranged at a predetermined interval in the circumferential direction of the rotor 12 with the base end portion and the tip end portion of the stationary blade 20 supported by the casing 11. The stationary blade unit 17 is provided, and the above-described stationary blade unit is applied as the final stage stationary blade unit 17 of the plurality of stages of stationary blade units 17.

  Accordingly, it is possible to improve the performance of the stationary blade 20 by suppressing the protruding amount of the groove welds 71, 72, 73, 74 to the steam passage 21 side, and to facilitate the assembly of the stationary blade 20 and to improve the workability. Can be improved.

  In the embodiment described above, the split ring 32 (the shroud 33) is disposed on the first split body 51 disposed on the back plate 41 side of the stationary blade body 31 and on the ventral plate 42 side of the stationary blade body 31. The second divided body 52 and the third divided body 53 arranged on the rear edge portion 31a side of the stationary blade body 31 are configured, but the present invention is not limited to this configuration. That is, the division position of the divided body is not limited to the embodiment, and may be divided at any position. Further, the number of divisions of the divided body is not limited to the embodiment (three), and may be two or four or more.

  In the above-described embodiment, the end portion of the stationary blade body 31 protrudes from the split ring 32 (the shroud 33) and is connected, but the configuration is not limited to this. For example, the end of the stationary blade body 31 may be connected to the same position as the inner surface of the split ring 32 (the shroud 33). That is, the end portion of the stationary blade body 31 may not protrude from the split ring 32 (the shroud 33).

  Further, in the above-described embodiment, the stationary blade and the stationary blade unit of the present invention are applied to the stationary blade and the stationary blade unit in the final stage of the steam turbine, but may be applied to other stationary blades and the stationary blade unit.

DESCRIPTION OF SYMBOLS 11 Casing 12 Rotor 13 Bearing 14 Rotor unit 15 Disc 16 Rotor blade 17 Stator blade unit 18 Outer ring 19 Inner ring 20 Stator blade 21 Steam passage 31 Stator blade main body 31a Rear edge part 32 Split ring (support member)
33 Shroud (support member)
41 Back side plate 42 Ventral side plate 51 1st division body 51a 1st connection part 51b 1st groove part 52 2nd division body 52a 2nd connection part 52b 2nd groove part 53 3rd division body 53a, 53b 3rd Connection part 53c, 53d 3rd groove part 54 V-shaped part 54a Intersection part 55a, 55b, 55c, 55d, 56a, 56b, 56c, 57a, 57b, 57c, 57d, 57e Connection surface (connection part)
61, 62, 63 Laser weld 71, 72, 73, 74 Groove weld 75 Non-groove weld 83 Drain passage

Claims (8)

A stationary blade body,
A support member through which an end of the stationary blade body is fixed, and
Have
The support member is composed of a plurality of divided bodies arranged around the end of the stationary blade body,
While a weld is provided between the plurality of divided bodies,
Groove weld provided we are between the dividing member and the end portion of the stationary blade body,
The plurality of divided bodies include a first divided body disposed on the back side of the stationary blade body, a second divided body disposed on the ventral side of the stationary blade body, and a rear edge portion side of the stationary blade body. A third divided body arranged in
A stationary blade characterized by that.   The stationary blade according to claim 1, wherein the plurality of divided bodies are provided with a groove portion at a connection portion with the stationary blade body.   The stationary blade according to claim 2, wherein the plurality of divided bodies are provided with a connecting portion with the adjacent support member on a surface opposite to the groove portion. The third split body, V-shaped section consisting of two coupling parts is provided, according claim 1, characterized in that HiHiraku destination weld portion is provided at the intersection of the two connecting portions Item 4. The stator blade according to any one of Items 3 to 3 . The stationary blade according to any one of claims 1 to 4 , wherein an end portion of the stationary blade main body is disposed so as to protrude from the support member. The stator blade according to claim 5 , wherein the stator blade body is provided with a hollow portion penetrating in a longitudinal direction, and a drain passage communicating with the hollow portion is provided at an end portion penetrating the support member. . By connecting the supporting members, the stationary blade according to any one of claims 1 to 6 is assembled in a ring shape, and configured.
A stationary blade unit characterized by that. A casing,
A rotor rotatably supported in the casing;
A plurality of rotor blade units in which a base end portion of a rotor blade is supported by the rotor and is arranged in a plurality at predetermined intervals in the circumferential direction of the rotor;
A plurality of stages of stationary blade moving blade units in which a base end portion and a distal end portion of a stationary blade are supported by the casing and are arranged at a predetermined interval in the circumferential direction of the rotor;
Have
The stationary blade unit according to claim 7 is applied as a final-stage stationary blade unit among the plurality of stages of stationary blade units.
A steam turbine characterized by that.

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