Soundproofing walls and steam turbines

Abstract

This soundproof wall is provided with: a frame disposed in an annular space on the outer circumferential side of a rotary shaft; a sound absorbing material supported by the frame; and a movement restricting member for restricting movement of the sound absorbing material toward an axial noise-source side which is the side on which a noise source exists. The frame is provided with a support plate part that extends circumferentially and spreads radially; an outer circumferential plate part that extends from a radial outer end of the support plate part toward the axial noise-source side and extends circumferentially, and an inner circumferential plate part that extends from a radial inner end of the support plate part toward the axial noise-source side and that extends circumferentially. The sound absorbing material is stored in a sound absorbing material storage space demarked by the support plate part, the outer circumferential plate part, and the inner circumferential plate part. The movement restricting member has a sound absorbing material pressing member that comes into contact with the sound absorbing material only at a position away from the outer and inner circumferential plate parts and that cannot move relatively to the support plate part in the axial direction.

Description

[Technical field]

[0001] The present disclosure relates to a sound barrier and a steam turbine. This application claims priority to Patent Application No. 2021-197506, filed in Japan on December 6, 2021, the contents of which are incorporated herein by reference. [Background technology]

[0002] Patent Document 1 describes a sound insulation structure near the gland of a low-pressure steam turbine. The sound insulation structure of Patent Document 1 has a sound insulation plate provided on the external space side of the gland to block high-frequency noise caused by vibration of the bellows, which occurs due to the flow of gland steam flowing from the gland into the space on the bellows side. The sound insulation plate of Patent Document 1 includes a soundproofing material, a punched metal and a cover arranged to sandwich the soundproofing material. The cover is fixed to the external casing, thereby supporting the sound insulation plate on the external casing. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2003-254008 A Summary of the Invention [Problem to be solved by the invention]

[0004] In the sound insulation structure described in Patent Document 1, a perforated metal is placed closer to the bellows, which is the noise source, than the sound-absorbing material, and this perforated metal is supported by a cover. Therefore, when the perforated metal vibrates due to noise from the bellows, this vibration is transmitted to the cover, which may result in failure to obtain the desired soundproofing performance.

[0005] The present disclosure has been made in consideration of the above circumstances, and provides a soundproof wall and a steam turbine that can improve soundproofing performance. [Means for solving the problem]

[0006] In order to solve the above problems, the following configuration is adopted. According to one aspect of the present disclosure, the soundproof wall is a soundproof wall disposed in an annular space on an outer circumferential side of a rotating shaft that is rotatable around an axis. So, The present invention is provided with a frame disposed in the annular space, a sound absorbing material supported by the frame, and a movement restricting member that restricts the sound absorbing material from moving toward an axial noise source side, which is a noise source side, of both sides in the axial direction in which the axis extends. 、 The frame includes a support plate portion that extends in a circumferential direction centered on the axis and expands in a radial direction centered on the axis, an outer circumferential plate portion that extends from an outer end of the support plate portion in the radial direction toward the axial noise source side and extends in the circumferential direction, and an inner circumferential plate portion that extends from an inner end of the support plate portion in the radial direction toward the axial noise source side and extends in the circumferential direction. 、 The sound absorbing material is accommodated in a sound absorbing material accommodation space defined by the support plate portion, the outer peripheral plate portion, and the inner peripheral plate portion. 、 The movement restricting member has a sound absorbing material pressing member that is in contact with the sound absorbing material only at a position away from the outer peripheral plate portion and the inner peripheral plate portion and is unable to move relatively in the axial direction with respect to the support plate portion. the frame includes a first side plate portion extending inward in the radial direction from an end on a first side of the outer peripheral plate portion in the circumferential direction to be connected to an end on the first side of the inner peripheral plate portion in the circumferential direction and connected to an end on the first side of the support plate portion in the circumferential direction, and a second side plate portion extending inward in the radial direction from an end on a second side of the outer peripheral plate portion in the circumferential direction to be connected to an end on the second side of the inner peripheral plate portion in the circumferential direction and connected to an end on the second side of the support plate portion in the circumferential direction, the sound-absorbing material accommodating space being formed by the support plate portion, the outer peripheral plate portion, the inner peripheral plate portion, the first side plate portion, and the second side plate portion, and the sound-absorbing material pressing member is in contact with the sound-absorbing material only at a position away from the outer peripheral plate portion, the inner peripheral plate portion, the first side plate portion, and the second side plate portion. do.

[0007] According to one aspect of the present disclosure, a steam turbine includes a steam turbine rotor rotatable about an axis, a steam turbine casing arranged on the outer periphery of the steam turbine rotor, a gland portion that seals the periphery of the steam turbine rotor, a bellows portion that seals the space between the gland portion and the steam turbine casing while allowing relative displacement between the gland portion and the steam turbine casing in the axial direction along which the axis extends, and the above-mentioned soundproof wall that is arranged in an annular space on the outer periphery of the steam turbine rotor as a rotating shaft. Effect of the Invention

[0008] According to the above-mentioned soundproof wall and steam turbine, the soundproofing performance can be improved. [Brief description of the drawings]

[0009] [Figure 1] FIG. 1 illustrates a configuration of a steam turbine in an embodiment of the present disclosure. [Diagram 2] 2 is an enlarged view of the vicinity of a gland portion of a steam turbine according to an embodiment of the present disclosure. FIG. [Diagram 3] FIG. 2 is a view of a soundproof wall according to an embodiment of the present disclosure, viewed from the side opposite to a noise source in the axial direction. [Figure 4] FIG. 2 is a perspective view showing a soundproof wall according to an embodiment of the present disclosure, partially exploded in the circumferential direction. [Diagram 5] 4 is a cross-sectional view including an axis of a first frame among frames according to an embodiment of the present disclosure. FIG. [Figure 6] 11 is a cross-sectional view including an axis of a frame other than a first frame among the frames according to the embodiment of the present disclosure. FIG. [Figure 7] 4 is a cross-sectional view of the vicinity of a second vibration-proof sheet in an embodiment of the present disclosure. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Next, a soundproof wall and a steam turbine according to an embodiment of the present disclosure will be described with reference to the drawings. <<Configuration of a steam turbine>> As shown in FIG. 1 and FIG. 2, the steam turbine 5 is a so-called two-flow exhaust steam turbine, and includes a first steam turbine section 10a and a second steam turbine section 10b. Each of the first steam turbine section 10a and the second steam turbine section 10b includes a turbine rotor (rotating shaft, steam turbine rotor) 11 rotating about an axis Ar, a casing (steam turbine casing) 20 covering the turbine rotor 11, a plurality of stator blade rows 17 fixed to the casing 20, a steam inlet pipe 19, a gland section 40 sealing the periphery of the turbine rotor 11, a bellows section 50 closing the gap between the gland section 40 and the casing 20, and a soundproof wall 60 disposed in an annular space 90 on the outer periphery side of the turbine rotor 11. In the following description, the circumferential direction centered on the axis Ar is simply referred to as the circumferential direction Dc, and the direction perpendicular to the axis Ar is referred to as the radial direction Dr. Furthermore, the side of the axis Ar in this radial direction Dr is referred to as the radially inner side Dri, and the opposite side is referred to as the radially outer side Dro. The first steam turbine section 10a and the second steam turbine section 10b are basically configured in the same manner, and therefore, in the following description, only the first steam turbine section 10a will be described, and a detailed description of the second steam turbine section 10b will be omitted.

[0011] The turbine rotor 11 has a rotor shaft 12 extending in an axial direction Da about the axis Ar, and a plurality of moving blade rows 13 attached to the rotor shaft 12. The turbine rotor 11 is supported by bearings 18 so as to be rotatable about the axis Ar. The plurality of moving blade rows 13 are aligned in the axial direction Da. Each moving blade row 13 is composed of a plurality of moving blades aligned in the circumferential direction Dc. The turbine rotor 11 of the first steam turbine section 10a and the turbine rotor 11 of the second steam turbine section 10b are located on the same axis Ar, are connected to each other, and rotate integrally about the axis Ar.

[0012] The casing 20 has an inner casing 21 and an outer casing 30 . Between the inner casing 21 and the rotor shaft 12, a first space 21s is formed that is annular and centered on the axis Ar. Steam (fluid) flowing in from the steam inlet pipe 19 flows through this first space 21s in the axial direction Da (more specifically, toward the axial downstream side Dad). A plurality of rotor blade rows 13 of the turbine rotor 11 are arranged in this first space 21s. A plurality of stator blade rows 17 are arranged in the first space 21s, aligned in the axial direction Da. Each of the plurality of stator blade rows 17 is arranged on the axial upstream side Dau of any one of the plurality of rotor blade rows 13. The plurality of stator blade rows 17 are fixed to the inner casing 21.

[0013] The outer casing 30 surrounds the turbine rotor 11 and the inner casing 21, and forms a second space 30s between the outer casing 30 and the inner casing 21, into which steam having flowed through the first space 21s is discharged. This second space 30s is in communication with the diffuser 26, and is formed on the outer periphery of the diffuser 26. The outer casing 30 guides the steam that has flowed from the diffuser space 26s into the second space 30s to the exhaust port 31.

[0014] The outer casing 30 has an exhaust port 31 on a first side (lower side in FIG. 1 ) in a direction perpendicular to the axis Ar. The outer casing 30 illustrated in this embodiment opens vertically downward. The steam turbine 5 in this embodiment is a so-called downward exhaust type condensing steam turbine, and a condenser (not shown) that converts steam back to water is connected to the exhaust port 31.

[0015] The diffuser 26 is disposed on the axial downstream side Dad of the inner casing 21, and connects the first space 21s and the second space 30s. The diffuser 26 forms an annular diffuser space 26s that gradually moves toward the radially outer side Dro as it approaches the axial downstream side Dad. Steam that flows out toward the axial downstream side Dad from the rotor blade row 13a disposed on the most axial downstream side Dad of the turbine rotor 11 flows into the diffuser space 26s.

[0016] The diffuser 26 has an outer diffuser 27 that defines the edge of the diffuser space 26s on the radially outer side Dro, and an inner diffuser 29 that defines the edge of the diffuser space 26s on the radially inner side Dri.

[0017] The outer diffuser 27 has a cylindrical shape extending toward the axial downstream side Dad from an end edge of the axial downstream side Dad of the inner casing 21. The outer diffuser 27 has an annular cross section perpendicular to the axis Ar, and the diameter gradually increases toward the axial downstream side Dad.

[0018] The inner diffuser 29 is formed in a cylindrical shape extending to the axial downstream side Dad so as to be continuous with the inner surface 12a that defines the radially inner side Dri of the first space 21s. The inner diffuser 29 has an annular cross section perpendicular to the axis Ar, and the diameter of the inner diffuser 29 gradually increases toward the radially outer side Dro as it approaches the axially downstream side Dad.

[0019] <<Configuration of the ground section and bellows section>> Fig. 2 is an enlarged view of the vicinity of a gland portion of a steam turbine according to an embodiment of the present disclosure. Fig. 3 is a view of a soundproof wall according to an embodiment of the present disclosure, seen from the side opposite to a noise source in the axial direction. Fig. 4 is a perspective view of a soundproof wall according to an embodiment of the present disclosure, partially exploded in the circumferential direction. As shown in FIG. 1 and FIG. 2, the gland portion 40 is disposed on the radially inner side Dri of the inner diffuser 29. The gland portion 40 is formed in an annular shape surrounding the entire circumference of the turbine rotor 11 from the outer periphery side. The gland portion 40 of this embodiment is supported by a bearing box that accommodates the bearing 18. The bearing box has an anchor point in the axial direction Da, and is not displaceable in the axial direction Da. As a result, the gland portion 40 of this embodiment is not displaceable around the axis Ar and in the axial direction Da. A gap is formed between the gland portion 40 and the turbine rotor 11 in the radial direction Dr. Steam is supplied to the gland portion 40 from the outside, and the steam flows into the gap between the gland portion 40 and the turbine rotor 11 from the inner periphery side of the gland portion 40. The steam supplied to the gap between the gland portion 40 and the turbine rotor 11 flows from the gap to the axial upstream side Dau and the axial downstream side Dad. In this way, the gland portion 40 prevents the steam from flowing out of the steam turbine 5. The gland portion 40 has a gland flange 41 at an end portion on the axial upstream side Dau for fixing the bellows portion 50. The gland flange 41 extends radially outwardly Dro and also extends in the circumferential direction Dc to form an annular shape.

[0020] Fig. 5 is a cross-sectional view including an axis of a first frame among the frames in the embodiment of the present disclosure, and Fig. 6 is a cross-sectional view including an axis of a frame other than the first frame among the frames in the embodiment of the present disclosure. 2, 5 and 6, the bellows portion 50 closes the gap between the gland portion 40 and the casing 20 while allowing relative displacement between the gland portion 40 and the casing 20 in the axial direction Da. The bellows portion 50 includes a bellows main body portion 51, a bellows support portion 52, and an inner bellows portion flange 53. The assembly of the gland portion 40 and the bellows portion 50 described above can also be referred to as a shaft seal device.

[0021] The bellows body 51 is disposed at a distance from the turbine rotor 11 on the radially outer side Dro, and covers the turbine rotor 11 from the outer periphery. The bellows body 51 is elastically deformed to change the length dimension in the axial direction Da. The bellows body 51 illustrated in this embodiment is a pipe with a bellows structure extending in the axial direction Da. An end 51d of the bellows body 51 on the axial downstream side Dad is fixed to a ring-shaped inner bellows flange 53, and is fixed to the above-mentioned gland flange 41 via the inner bellows flange 53. The inner bellows flange 53 and the gland flange 41 can be fixed to each other by fasteners such as bolts (not shown) from the axial downstream side Dad of the gland flange 41 with the inner bellows flange 53 abutting against the gland flange 41 from the axial upstream side Dau. A part of the steam ejected from the gland portion 40 collides with the bellows body 51 in this embodiment. This causes the bellows body 51 to vibrate and generate high-frequency noise. In other words, the bellows body 51 is a noise source.

[0022] The bellows support portion 52 extends from an end portion 51u of the axial upstream side Dau of the bellows main body portion 51 opposite to the gland portion 40 to a radially outer side (outer circumferential side) Dro and is connected to a flange portion 54 formed on the casing 20. In other words, the bellows support portion 52 supports the end portion 51u of the axial upstream side Dau of the bellows main body portion 51 from the radially outer side Dro. Here, the flange portion 54 illustrated in this embodiment is disposed at the same position as the gland flange 41 in the axial direction Da, and is disposed at a distance from the gland flange 41 on the radially outer side Dro. The flange portion 54 is formed in an annular shape protruding from the inner diffuser 29 to the radially inner side Dri.

[0023] The bellows support portion 52 includes a first support portion 55 and a second support portion 56 . The first support portion 55 is formed in an annular shape extending from an end portion 51u on the axial upstream side Dau of the bellows body portion 51 to the radially outer side Dro and extending in the circumferential direction Dc. The first support portion 55 in this embodiment is formed in a flat plate shape extending in a direction perpendicular to the axis Ar, and an end portion 55o of the first support portion 55 on the radially outer side Dro is spaced from the inner diffuser 29 to the radially inner side Dri.

[0024] The second support portion 56 extends from an end portion 55o on the radially outer side Dro of the first support portion 55 along the inner diffuser 29. In other words, the second support portion 56 is formed in a cylindrical shape whose diameter gradually increases toward the axial downstream side Dad. An outer bellows flange 56b for fixing is formed at an end portion 56d on the axial downstream side Dad of the second support portion 56, and this outer bellows flange 56b is fixed to the flange portion 54 of the casing 20 described above. The outer bellows flange 56b and the flange portion 54 illustrated in this embodiment can be fixed by fasteners 57 such as bolts from the axial downstream side Dad of the flange portion 54 in a state in which the outer bellows flange 56b is abutted against the flange portion 54 from the axial upstream side Dau.

[0025] The bellows portion 50 is configured as described above, and seals the gap between the flange portion 54 of the casing 20 and the gland flange 41 of the gland portion 40 while allowing relative displacement between the flange portion 54 and the gland flange 41 in the axial direction Da and the radial direction Dr. The outer bellows portion flange 56b of the bellows portion 50 has a plurality of protrusions 58 protruding toward the radially inward direction Dri. As shown in FIG. 3, these plurality of protrusions 58 are arranged at intervals in the circumferential direction Dc. As shown in FIG. 5, a soundproof wall 60 is fixed to these protrusions 58 from the axial downstream side Dad by fasteners 59 such as bolts.

[0026] <<Soundproof wall structure>> As shown in FIG. 2, the soundproof wall 60 is disposed in the annular space 90 on the outer periphery side of the turbine rotor 11, which is a rotating shaft. In other words, the soundproof wall 60 is disposed on the outer periphery side of the gland portion 40 and the outer periphery side of the bellows main body portion 51, and on the inner periphery side of the second support portion 56 of the bellows support portion 52. The soundproof wall 60 reduces noise transmitted in the axial direction Da through the annular space 90. The soundproof wall 60 is formed in an annular shape that is slightly smaller than the annular space 90 as viewed from the axial direction Da. As shown in FIG. 5 and FIG. 6, the soundproof wall 60 includes a frame 61, a sound absorbing material 62, a sound insulation plate material 80, a movement restricting member 63, and a vibration-proof sheet 81. The frame 61 of this embodiment is disposed in the annular space 90 and supports the sound absorbing material 62. The frame 61 includes a support plate portion 64, an outer peripheral plate portion 65, an inner peripheral plate portion 66, a first side plate portion (side plate) 67 (see FIG. 4), and a second side plate portion (side plate) 68 (see FIG. 4). The vibration-proof sheet 81 of this embodiment includes a first vibration-proof sheet 81A and a second vibration-proof sheet 81B (see FIG. 7).

[0027] Frame Composition 3, a plurality of frames 61 are provided in this embodiment, and these frames 61 are arranged in the circumferential direction Dc to form a ring. The soundproof wall 60 in this embodiment includes a first frame 61A, a second frame 61B, a third frame 61C, and a fourth frame 61D as the plurality of frames 61. The first frame 61A, the second frame 61B, the third frame 61C, and the fourth frame 61D have different length dimensions in the circumferential direction Dc.

[0028] 2 to 4, the first frame 61A, the second frame 61B, the third frame 61C, and the fourth frame 61D each include the support plate portion 64, the outer peripheral plate portion 65, and the inner peripheral plate portion 66, and further include a first side plate portion 67 and a second side plate portion 68. In the following description, when describing a configuration common to the first frame 61A, the second frame 61B, the third frame 61C, and the fourth frame 61D, these will not be distinguished from each other and will simply be referred to as frame 61. In FIG. 4, the shape of the frame 61 is partially simplified.

[0029] The support plate portion 64 is formed in a plate shape extending in the circumferential direction Dc and expanding in the radial direction Dr. The support plate portion 64 of this embodiment includes an arc-shaped outer peripheral edge 69 extending in the circumferential direction Dc along the flange portion 54 when viewed from the axial direction Da, an arc-shaped inner peripheral edge 70 extending along the ground flange 41, a linear first side edge 71 extending in the radial direction Dr on a first side of the circumferential direction Dc, and a linear second side edge 72 extending in the radial direction Dr on a second side of the circumferential direction Dc. A boss 64b (see FIG. 5) fixed to the above-mentioned protrusion portion 58 by the fastener 59 is provided near the outer peripheral edge 69 of the support plate portion 64. The boss 64b is disposed on the axial downstream side Dad of the fastener 59.

[0030] The outer peripheral plate portion 65 extends from the end of the radially outer side Dro of the support plate portion 64 toward the axial upstream side (axial noise source side) Dau and also extends in the circumferential direction Dc. More specifically, the outer peripheral plate portion 65 extends from the entire outer peripheral edge 69 of the support plate portion 64 toward the axial upstream side Dau, and is formed in an arc shape with the same curvature radius as the outer peripheral edge 69 of the support plate portion 64 when viewed from the axial direction Da. In this embodiment, the length dimension of the outer peripheral plate portion 65 in the axial direction Da is larger than the length dimension of the outer bellows portion flange 56b in the axial direction Da, for example, about twice as large. The outer peripheral plate portion 65 of this embodiment has an inclined portion 65b that approaches the radially inner side Dri as it approaches the axial upstream side Dau in a portion facing the second support portion 56 of the bellows portion 50 in the radial direction Dr (see Figs. 5 and 6).

[0031] The inner peripheral plate portion 66 extends from the inner end of the support plate portion 64 in the radial direction Dr toward the axial upstream side Dau and also extends in the circumferential direction Dc. More specifically, the inner peripheral plate portion 66 extends from the entire area of ​​the inner peripheral edge 70 of the support plate portion 64 toward the axial upstream side Dau, and is formed in an arc shape with the same curvature radius as the inner peripheral edge 70 of the support plate portion 64 when viewed from the axial direction Da. A sound absorbing material accommodating space 73 (see Figs. 5 and 6) is formed between the outer peripheral plate portion 65 and the inner peripheral plate portion 66 in the radial direction Dr. In this embodiment, the length dimension of the inner peripheral plate portion 66 in the axial direction Da is equal to the length dimension of the outer peripheral plate portion 65 in the axial direction Da. The inner peripheral plate portion 66 is disposed at a distance from the gland flange 41 and the inner bellows flange 53 in the radial direction Dr so as not to contact the gland flange 41 and the inner bellows flange 53.

[0032] The first side plate portion 67 extends from a first side end in the circumferential direction Dc of the outer circumferential plate portion 65 toward the radially inward direction Dri and is connected to a first side end in the circumferential direction Dc of the inner circumferential plate portion 66. The first side plate portion 67 is also connected to a first side edge (end) 71 on the first side in the circumferential direction Dc of the support plate portion 64. The first side plate portion 67 in this embodiment is formed in a flat plate shape and has a rectangular shape when viewed from the circumferential direction Dc.

[0033] The second side plate portion 68 extends from the end of the outer peripheral plate portion 65 on the second side in the circumferential direction Dc toward the radially inner side Dri and is connected to the end of the inner peripheral plate portion 66 on the second side in the circumferential direction Dc. The second side plate portion 68 is also connected to a second side edge (end) 72 on the second side in the circumferential direction Dc of the support plate portion 64. The second side plate portion 68 of this embodiment is formed symmetrically with the first side plate portion 67 in the circumferential direction Dc, has a flat plate shape, and has the same rectangular shape as the first side plate portion 67 when viewed from the circumferential direction Dc. The sound absorbing material accommodating space 73 of this embodiment is defined by the support plate portion 64, the outer peripheral plate portion 65, the inner peripheral plate portion 66, the first side plate portion 67, and the second side plate portion 68.

[0034] 2, 3, and 5, the first frame 61A is located at the uppermost position in the annular space 90. In this embodiment, a pipe 32 for performing balance adjustment of the turbine rotor 11 is provided immediately on the axial upstream side Dau of the first frame 61A.

[0035] The first frame 61A, unlike the other frames 61 (see FIG. 6), has a partition plate portion 74 that divides the sound absorbing material accommodating space 73 in the radial direction Dr. The partition plate portion 74 extends from the support plate portion 64 toward the axial upstream side Dau and also extends in the circumferential direction Dc. The partition plate portion 74 illustrated in this embodiment has the same length dimension in the axial direction Da as the inner circumferential plate portion 66 and is formed in a flat plate shape extending in the horizontal direction.

[0036] The sound-absorbing material accommodating space 73 is divided into two spaces: an outer accommodating space 73o that is radially outer than the partition plate portion 74, and an inner accommodating space 73i that is radially inner than the partition plate portion 74. The reason why only the first frame 61A is provided with the partition plate portion 74 as described above is because the end of the axial downstream side Dad of the pipe 32 is disposed in a part of the radially outer side Dro of the sound-absorbing material accommodating space 73. In other words, the partition plate portion 74 divides the sound-absorbing material accommodating space 73 into the outer accommodating space 73o in which the pipe 32 is disposed, and the inner accommodating space 73i that is not affected by the pipe 32.

[0037] As shown in FIG. 3, the first frame 61A, the second frame 61B, the third frame 61C, and the fourth frame 61D are formed with the same radius of curvature centered on the axis Ar, and the lengths in the circumferential direction Dc, in other words, the angular ranges around the axis Ar in the annular space 90 are different. In this embodiment, one first frame 61A, two second frames 61B, and two third frames 61C are arranged above a horizontal plane Hp including the axis Ar, and three fourth frames 61D are arranged below the horizontal plane Hp. In this embodiment, the angular ranges are 30 degrees for the first frame 61A and the second frame 61B, 45 degrees for the third frame 61C, and 60 degrees for the fourth frame 61D. The second frame 61B and the third frame 61C are arranged in this order on both sides of the first frame 61A in the circumferential direction Dc, and only the fourth frame 61D is arranged below the horizontal plane Hp.

[0038] <Composition of sound-absorbing material> As shown in FIG. 2 and FIG. 4, the sound absorbing material 62 is accommodated in the sound absorbing material accommodation space 73 of the frame 61. The sound absorbing material 62 is made of glass fiber or the like. A plurality of sound absorbing materials 62 are accommodated in the sound absorbing material accommodation space 73 in a line in the axial direction Da. In this embodiment, the plurality of sound absorbing materials 62 include a first sound absorbing material 62A arranged on the axial downstream side Dad and a second sound absorbing material 62B arranged on the axial upstream side Dau. In this embodiment, a case where the thickness dimensions of the first sound absorbing material 62A and the second sound absorbing material 62B in the axial direction Da are the same is illustrated. In the following description, when it is not necessary to distinguish between the first sound absorbing material 62A and the second sound absorbing material 62B, they may be simply referred to as sound absorbing material 62.

[0039] <Composition of soundproofing board material> As shown in FIG. 4, the sound insulation plate 80 is disposed between the sound absorbing materials 62 adjacent to each other in the axial direction Da. Specifically, the sound insulation plate 80 is disposed between the first sound absorbing material 62A and the second sound absorbing material 62B adjacent to each other in the axial direction Da. The sound insulation plate 80 extends in the circumferential direction Dc and expands in the radial direction Dr. The sound insulation plate 80 of this embodiment is formed in a flat plate shape, and is formed slightly smaller than the outline of the sound absorbing material accommodating space 73 as viewed from the axial direction Da. The sound insulation plate 80 is formed with a through hole 80h through which the fixing member 77 passes. The material for forming the sound insulation plate 80 can be, for example, the same metal material as the frame 61.

[0040] In this embodiment, the fixing member 77 extends perpendicularly to the surface of the sound insulation board 80 facing the axial direction Da. Although FIG. 4 illustrates an example in which there are two through holes 80h, the number of through holes 80h is determined according to the number of fixing members 77 provided on the frame 61 to which the sound insulation board 80 is to be attached. When the fixing members 77 penetrate the through holes 80h, the sound insulation board 80 is not in contact with any of the outer peripheral plate portion 65, the inner peripheral plate portion 66, the first side plate portion 67, and the second side plate portion 68. In the first frame 61A, the sound insulation board 80 is provided only in the inner housing space 73i in which the first sound absorbing material 62A and the second sound absorbing material 62B are housed.

[0041] <Configuration of movement restricting member> 4, 5 and 6, the movement restricting member 63 restricts movement of the sound absorbing material 62 toward the axial upstream side (axial noise source side) Dau where the bellows main body 51, which is the noise source, is disposed. The movement restricting member 63 in this embodiment includes a sound absorbing material pressing member 76, a fixing member 77, and a nut 79.

[0042] The sound absorbing material pressing member 76 is immovable relative to the support plate portion 64 in the axial direction Da, and contacts the sound absorbing material 62 only at a position away from the outer peripheral plate portion 65 and the inner peripheral plate portion 66. Furthermore, the sound absorbing material pressing member 76 of this embodiment contacts the sound absorbing material 62 at a position away from the first side plate portion 67 and the second side plate portion 68 in addition to the outer peripheral plate portion 65 and the inner peripheral plate portion 66. The sound absorbing material pressing member 76 of this embodiment is formed in a rod shape extending straight perpendicular to the axis Ar. Near both ends of the sound absorbing material pressing member 76, through holes 78 are formed that can pass through the fixing member 77 in the axial direction Da.

[0043] The fixing member 77 is fixed to the support plate portion 64 and extends from the support plate portion 64 toward the axial upstream side Dau. The fixing member 77 illustrated in this embodiment is formed in a rod shape (in other words, a cylindrical shape) extending straight in the axial direction Da. As shown in Figs. 5 and 6, the fixing member 77 disposed in the inner accommodation space 73i of the first frame 61A and the fixing member 77 disposed in the sound absorbing material accommodation space 73 of the second frame 61B to the fourth frame 61D each penetrate the first sound absorbing material 62A, the sound insulation plate material 80, and the second sound absorbing material 62B in this order from the axial downstream side Dad toward the axial upstream side Dau, and the tip portion is exposed on the axial upstream side Dau of the second sound absorbing material 62B. On the other hand, the fixing member 77 of the outer housing space 73o of the first frame 61A penetrates only the first sound absorbing material 62A, and the tip portion thereof is exposed on the axial upstream side Dau of the first sound absorbing material 62A.

[0044] As shown in Figs. 3, 5 and 6, the fixing member 77 is disposed at a position away from the outer peripheral plate portion 65 and the inner peripheral plate portion 66. A plurality of fixing members 77 are provided on each frame 61. In this embodiment, two fixing members 77 are used as a set, which are spaced apart in the circumferential direction Dc. More specifically, one fixing member 77 is inserted into each of two through holes 78 provided in one sound absorbing material pressing member 76. A male thread (not shown) is formed at the tip of the fixing member 77, and a nut 79 can be attached to the fixing member 77. The nut 79 restricts the displacement of the sound absorbing material pressing member 76 toward the axial upstream side Dau. The nut 79 may be prevented from rotating by, for example, a tongue washer or a lock nut.

[0045] As shown in Fig. 3, each frame 61 is provided with a number of sets of fixing members 77 aligned in the circumferential direction Dc according to the length dimension of the frame 61 in the circumferential direction Dc. In the present embodiment, the second frame 61B is provided with one set of fixing members 77 in the circumferential direction Dc, and the third frame portion and the fourth frame 61D are provided with two sets of fixing members 77 in the circumferential direction Dc. The first frame 61A has an outer housing space 73o and an inner housing space 73i, and has a total of two sets of fixing members 77, one set each in the outer housing space 73o and the inner housing space 73i. However, the first frame 61A also has one set of fixing members 77 arranged at intervals in the circumferential direction Dc.

[0046] <<Configuration of the first vibration-proof sheet>> As shown in Figs. 5 and 6, the first vibration-proof sheet 81A attenuates vibration of the support plate 64. The first vibration-proof sheet 81A covers the outer surface 64a of the support plate 64 facing the axial downstream side Dad, which is the side opposite to the noise source in the axial direction Da. The first vibration-proof sheet 81A is made of, for example, a rubber sheet or a synthetic resin sheet. The first vibration-proof sheet 81A is fixed in a state of being in close contact with the support plate 64. The first vibration-proof sheet 81A is fixed to the support plate 64 by a plurality of fasteners 85 (see Fig. 7), such as bolts. The length dimension in the circumferential direction Dc of the first vibration-proof sheet 81A is equal to the length dimension in the circumferential direction Dc of the support plate 64 of each frame 61 arranged side by side in the circumferential direction Dc.

[0047] The first vibration-proof sheet 81A protrudes radially inward Dri from the support plate portion 64. The portion of the first vibration-proof sheet 81A protruding radially inward Dri is in contact with the gland flange 41 of the gland portion 40 or the inner bellows flange 53 of the bellows portion 50. The length dimension in the radial direction Dr of the portion of the first vibration-proof sheet 81A protruding radially inward Dri of the first vibration-proof sheet 81A in this embodiment is longer than the dimension in the radial direction Dr of the gap between the inner peripheral plate portion 66 and the inner bellows flange 53 or the gland flange 41, and the portion of the first vibration-proof sheet 81A protruding radially inward Dri is elastically deformed and positioned on the axial downstream side Dad as far as the radial inner side Dri. In other words, the first vibration-proof sheet 81A blocks the gap 83 between the inner peripheral plate portion 66 and the inner bellows flange 53 or the gland flange 41 from the axial downstream side Dad. The first vibration-proof sheet 81A in this embodiment also protrudes radially outward Dro from the support plate portion 64. The portion of the first vibration-proof sheet 81A that protrudes to the radially outer side Dro is in contact with the outer bellows part flange 56b and the flange part .

[0048] <<Configuration of the second vibration-proof sheet>> FIG. 7 is a cross-sectional view of the vicinity of the second vibration-proof sheet in an embodiment of the present disclosure. 7, the second vibration-proof sheet 81B closes the gap 84 between the frames 61 adjacent in the circumferential direction Dc from the axial downstream side Dad. Like the first vibration-proof sheet 81A, the second vibration-proof sheet 81B is made of a rubber sheet, a synthetic resin sheet, or the like. The second vibration-proof sheet 81B only needs to be able to close the gap 84, and may be formed, for example, with a shorter length dimension in the circumferential direction Dc than the first vibration-proof sheet 81A. Also, like the first vibration-proof sheet 81A, the second vibration-proof sheet 81B may be formed to protrude radially inward Dri and radially outward Dro from the support plate portion 64.

[0049] <Action and Effect> According to the above-mentioned embodiment, the sound absorbing material 62 accommodated in the sound absorbing material accommodation space 73 of the frame 61 is exposed to the axial upstream side Dau, while the movement restricting member 63 restricts the sound absorbing material from moving to the axial upstream side Dau. In addition, since the sound absorbing material pressing member 76 of the movement restricting member 63 contacts the sound absorbing material 62 only at a position away from the outer peripheral plate portion 65 and the inner peripheral plate portion 66, even if the sound absorbing material pressing member 76 vibrates due to noise from the axial upstream side Dau, the vibration can be suppressed from being transmitted to the support plate portion 64 via the outer peripheral plate portion 65 and the inner peripheral plate portion 66. In addition, according to the above-mentioned embodiment, in addition to the above, the sound absorbing material pressing member 76 contacts the sound absorbing material 62 only at a position away from the first side plate portion 67 and the second side plate portion 68, so that the vibration of the sound absorbing material pressing member 76 can also be suppressed from being transmitted to the support plate portion 64 via the first side plate portion 67 and the second side plate portion 68. Therefore, the soundproofing performance of the soundproof wall 60 can be improved.

[0050] Furthermore, according to the above embodiment, movement of the sound absorbing material 62 can be restricted simply by attaching the sound absorbing material pressing member 76 to the fixing member 77 fixed to the support plate portion 64. This makes it possible to easily store the sound absorbing material 62 in the sound absorbing material accommodating space 73 and remove it from the sound absorbing material accommodating space 73. This reduces the burden on the worker when removing and installing the sound absorbing material 62.

[0051] According to the above embodiment, the first sound absorbing material 62A and the second sound absorbing material 62B as the multiple sound absorbing materials 62 are arranged in the axial direction Da and accommodated in the sound absorbing material accommodation space 73, and the sound insulating plate 80 is provided between the multiple sound absorbing materials 62. Therefore, noise from the axial upstream side Dau can be absorbed by the second sound absorbing material 62B, and then reflected and attenuated by the sound insulating plate 80. Furthermore, noise transmitted from the sound insulating plate 80 to the axial downstream side Dad can be absorbed by the first sound absorbing material 62A. Therefore, the sound absorbing material 62 and the sound insulating plate 80 accommodated in the sound absorbing material accommodation space 73 of the frame 61 can efficiently improve the soundproofing performance.

[0052] Furthermore, according to the above embodiment, the multiple frames 61 are arranged in a ring shape in the circumferential direction Dc. Therefore, when the soundproof wall 60 is installed in the annular space 90, the frames 61 can be installed one by one in a ring shape, so that the weight of each frame 61 is reduced and the frames can be easily attached and detached, compared to the case where only one ring-shaped frame is installed. Furthermore, when adjusting the rotor balance via the pipe 32, only the frame 61A needs to be removed, and since the frame 61A can be configured to be small as described above, the frame 61A can be easily removed. Furthermore, since it is sufficient to adopt the structure of the first frame 61A only for the frame 61 in which the pipe 32 is arranged, it is possible to prevent the structures of the other frames 61, that is, the second frame 61B to the fourth frame 61D, from becoming complicated.

[0053] Furthermore, according to the above embodiment, the soundproof wall 60 is fixed only to the flange portion 54. Therefore, the bellows portion 50 seals the gap between the ground portion 40 and the casing 20, while not impeding the relative displacement between the ground portion 40 and the casing 20 in the axial direction Da, and noise caused by the bellows portion 50 can be prevented from being transmitted to the outside.

[0054] Furthermore, according to the above embodiment, the first vibration-proof sheet 81A that covers the outer surface 64a of the support plate portion 64 is provided, so that it is possible to attenuate vibration of the support plate portion 64 caused by noise from the bellows portion 50. Therefore, it is possible to further improve the soundproofing performance. Furthermore, since the first vibration-proof sheet 81A protrudes radially inward Dri from the support plate portion 64 and contacts the gland flange 41 or the inner bellows portion flange 53, the gap 83 between the inner circumferential plate portion 66 and the gland flange 41 or the inner bellows portion flange 53 can be blocked by the first vibration-proof sheet 81A. Therefore, it is possible to suppress the transmission of noise in the axial direction Da through the gap 83 between the inner circumferential plate portion 66 and the gland flange 41 or the inner bellows portion flange 53. In addition, since the first vibration-proof sheet 81A protrudes radially outward Dro and contacts the outer bellows portion flange 56b or the flange portion 54, it is possible to suppress the transmission of noise in the axial direction Da from between the outer circumferential plate portion 65 and the outer bellows portion flange 56b or the flange portion 54 in the radial direction Dr.

[0055] Furthermore, according to the above embodiment, the gap 84 between adjacent frames 61 in the circumferential direction Dc is sealed from the axial downstream side Dad by the second vibration-proof sheet 81B, thereby preventing noise from being transmitted in the axial direction Da through the gap 84.

[0056] Furthermore, according to the above embodiment, since the soundproof wall 60 is fixed only to the protruding portion 58 of the bellows portion 50, the soundproof wall 60 can be attached to and detached from the flange portion 54 of the casing 20 while being fixed to the bellows portion 50. Therefore, workability can be improved compared to a case where the bellows portion 50 is fixed to the casing 20 and then the soundproof wall 60 is attached to the bellows portion 50.

[0057] Other Embodiments The present disclosure is not limited to the configurations of the above-described embodiments, and design modifications are possible without departing from the spirit and scope of the present disclosure. For example, in the above-described embodiment, the soundproof wall 60 is installed in the annular space 90 on the outer periphery side of the turbine rotor 11 of the steam turbine 5, i.e., on the outer periphery side of the gland portion 40 or the outer periphery side of the bellows main body portion 51 and on the inner periphery side of the second support portion 56 of the bellows support portion 52. However, the location where the soundproof wall 60 is installed may be any annular space on the outer periphery side of a rotating shaft that can rotate about its axis, and is not limited to the case where the soundproof wall 60 is installed in the annular space 90 on the outer periphery side of the turbine rotor 11 of the steam turbine 5, i.e., on the outer periphery side of the gland portion 40 or the outer periphery side of the bellows main body portion 51 and on the inner periphery side of the second support portion 56 of the bellows support portion 52.

[0058] Furthermore, in the above embodiment, the case where a plurality of frames 61 are provided has been described, but it is also possible to provide a single frame 61 formed in an annular shape.

[0059] Furthermore, in the above-described embodiment, the steam turbine 5 is a two-way exhaust type and a downward exhaust type, but the configuration of the steam turbine 5 is not limited to the above-described configuration.

[0060] In the above embodiment, the sound absorbing material pressing member 76 is formed in a rod shape extending straight. However, the shape of the sound absorbing material pressing member 76 is not limited to the above-mentioned rod shape extending straight, and may be, for example, a flat plate shape, as long as it is a shape that can restrict the displacement of the sound absorbing material 62 toward the axial noise source without contacting the outer peripheral plate portion 65, the inner peripheral plate portion 66, the first side edge 71, and the second side edge 72.

[0061] Furthermore, in the above embodiment, a case has been described in which one sound absorbing material pressing member 76 is attached to two fixing members 77, but, for example, one sound absorbing material pressing member 76 may be attached to one fixing member 77, or one sound absorbing material pressing member 76 may be attached to three or more fixing members 77. Also, a case has been described in which a male thread is formed on the fixing member 77, and a nut 79 is screwed into this male thread to fix the sound absorbing material 62 and the sound insulation board 80. However, the shape of the fixing member 77 is not limited to the above as long as it can penetrate the sound absorbing material 62 and the sound insulation board 80. In other words, as long as the sound absorbing material pressing member 76 can be fixed to the fixing member 77, it is not limited to a configuration in which it is fixed by the nut 79.

[0062] In the above embodiment, the case has been described in which the soundproof wall 60 is fixed to the protrusion 58 formed on the outer bellows part flange 56b of the bellows part 50. However, the soundproof wall 60 may be fixed directly to the flange part 54 of the casing 20 without using the outer bellows part flange 56b.

[0063] Furthermore, in the above embodiment, the first vibration-proof sheet 81A and the second vibration-proof sheet 81B are provided, but the vibration-proof sheet 81 may be omitted depending on the required soundproofing effect.

[0064] <Additional Notes> The soundproof wall and the steam turbine described in the embodiment can be understood, for example, as follows.

[0065] (1) According to a first aspect, a soundproof wall 60 is disposed in an annular space 90 on the outer circumferential side of a rotating shaft 11 rotatable about an axis Ar, and includes a frame 61 disposed in the annular space 90, a sound-absorbing material 62 supported by the frame 61, and a movement restricting member 63 that restricts movement of the sound-absorbing material 62 to the axial noise source side Dau, which is the noise source 51 side, of both sides Dau, Dad in the axial direction Da in which the axis Ar extends. The frame 61 includes a support plate portion 64 that extends in a circumferential direction Dc centered on the axis Ar and expands in a radial direction Dr centered on the axis Ar, and an outer side D of the support plate portion 64 in the radial direction Dr. and an inner circumferential plate portion 66 extending from an end of the support plate portion 64 on the inner side Dri in the radial direction Dr toward the axial noise source side Dau and extending in the circumferential direction Dc, the sound-absorbing material 62 is accommodated in a sound-absorbing material accommodating space 73 partitioned by the support plate portion 64, the outer circumferential plate portion 65, and the inner circumferential plate portion 66, and the movement-restricting member 63 has a sound-absorbing material holding member 76 that is in contact with the sound-absorbing material 62 only at a position away from the outer circumferential plate portion 65 and the inner circumferential plate portion 66 and is immovable in the axial direction Da relative to the support plate portion 64. An example of the rotating shaft is the turbine rotor 11. An example of the noise source is the bellows main body 51 that seals between the gland portion 40 and the casing 20 of the steam turbine 5.

[0066] As a result, even if the sound-absorbing material pressing member 76 vibrates due to noise from the axial noise source side Dau, the vibration can be prevented from being transmitted to the support plate portion 64 via the outer circumferential plate portion 65 and the inner circumferential plate portion 66. This makes it possible to improve the soundproofing performance of the soundproof wall 60.

[0067] (2) According to a second aspect, the soundproof wall 60 is the soundproof wall 60 of (1), wherein the movement-restricting member 63 is fixed to the support plate portion 64, and further includes a fixing member 77 extending from the support plate portion 64 toward the axial noise source side Dau and penetrating the sound-absorbing material 62, and the sound-absorbing material pressing member 76 is attached to the fixing member 77. This allows the sound absorbing material 62 to be easily accommodated in the sound absorbing material accommodating space 73, and also allows the sound absorbing material 62 to be easily removed from the sound absorbing material accommodating space 73. This reduces the burden on the worker when removing and attaching the sound absorbing material 62.

[0068] (3) According to a third aspect, the soundproof wall 60 is the soundproof wall 60 of (1) or (2), wherein the sound-absorbing materials 62 are accommodated in the sound-absorbing material accommodating space 73 in a row in the axial direction Da, and a sound-insulating plate material 80 is provided between adjacent sound-absorbing materials 62 in the axial direction Da, the sound-insulating plate material 80 extending in the circumferential direction Dc and expanding in the radial direction Dr. This allows the noise transmitted from the second sound absorbing material 62B to the first sound absorbing material 62A to be reflected and attenuated by the sound insulating board 80. Therefore, the soundproofing performance can be improved efficiently.

[0069] (4) According to a fourth aspect, the soundproof wall 60 is any one of the soundproof walls 60 of (1) to (3), and includes a plurality of the frames 61 arranged in a ring shape in the circumferential direction Dc. This allows the weight of each frame 61 to be reduced, and makes it easier to attach and detach the frame 61, compared to the case where only one annular frame is installed.

[0070] (5) According to a fifth aspect, the soundproof wall 60 is the soundproof wall 60 of (4), wherein the frame 61 includes a first side plate portion 67 extending from an end of the outer peripheral plate portion 65 on a first side in the circumferential direction Dc toward an inner side Dri in the radial direction Dr to be connected to an end of the inner peripheral plate portion 66 on the first side in the circumferential direction Dc and connected to an end of the support plate portion 64 on the first side in the circumferential direction Dc; and a second side plate portion 68 connected to the second end of the support plate portion 64 in the circumferential direction Dc, and connected to the second end of the support plate portion 64 in the circumferential direction Dc, the sound-absorbing material accommodating space 73 is formed by the support plate portion 64, the outer peripheral plate portion 65, the inner peripheral plate portion 66, the first side plate portion 67, and the second side plate portion 68, and the sound-absorbing material pressing member 76 is in contact with the sound-absorbing material 62 only at a position away from the outer peripheral plate portion 65, the inner peripheral plate portion 66, the first side plate portion 67, and the second side plate portion 68. As a result, when the frame 61 has the first side plate portion 67 and the second side plate portion 68, it is possible to suppress the vibration of the sound absorbing material pressing member 76 from being transmitted to the support plate portion 64 via the outer peripheral plate portion 65, the inner peripheral plate portion 66, the first side plate portion 67, and the second side plate portion 68. Therefore, it is possible to improve the soundproofing performance of the soundproof wall 60.

[0071] (6) According to a sixth aspect, the soundproof wall 60 is any one of the soundproof walls 60 of (1) to (5), and is provided with a first vibration-isolating sheet 81A covering an outer surface 64a of the support plate portion 64 facing the anti-noise source side Dad, which is opposite the axial noise source side Dau in the axial direction Da. This makes it possible to attenuate vibrations of the support plate portion 64. Therefore, it is possible to further improve the soundproofing performance.

[0072] (7) According to a seventh aspect, the soundproof wall 60 is the soundproof wall 60 of (4) or (5), and includes a first vibration-isolating sheet 81A covering an outer surface 64a of the support plate portion 64 facing the anti-noise source side Dad, which is opposite the axial noise source side Dau in the axial direction Da, and a second vibration-isolating sheet 81B sealing a gap 84 between adjacent support plate portions 64 in the circumferential direction Dc from the anti-noise source side Dad. This makes it possible for the first vibration-proof sheet 81A to dampen vibrations of the support plate portion 64, while the second vibration-proof sheet 81B can suppress the transmission of noise from the axial noise source side Dau to the anti-noise source side Dad through the gap 84.

[0073] (8) According to the eighth aspect, the steam turbine 5 comprises a steam turbine rotor 11 rotatable around an axis Ar, a steam turbine casing 20 arranged on the outer periphery of the steam turbine rotor 11, a gland portion 40 that seals the periphery of the steam turbine rotor 11, a bellows portion 50 that seals the space between the gland portion 40 and the steam turbine casing 20 while allowing relative displacement between the gland portion 40 and the steam turbine casing 20 in the axial direction Da along which the axis Ar extends, and a soundproof wall 60 of any one of (1) to (5) that is arranged in an annular space 90 on the outer periphery Dro of the steam turbine rotor 11 as a rotating shaft 11. This makes it possible to efficiently reduce noise generated from the bellows portion 50 due to steam ejected from the gland portion 40.

[0074] (9) According to a ninth aspect, the steam turbine 5 is the steam turbine 5 of (8), wherein the annular space 90 is formed between the gland portion 40 and the steam turbine casing 20 in the radial direction Dr, the bellows portion 50 includes a bellows main body portion 51 connected to the gland portion 40 and extending in the axial direction Da, and a bellows support portion 52 extending from an end Dau of the bellows main body portion 51 opposite the gland portion 40 to an outer circumferential side Dro and connected to a flange portion 54 of the steam turbine casing 20, and the soundproof wall 60 is supported only from the outer side Dro in the radial direction Dr. This prevents the soundproof wall 60 from interfering with the movement of the bellows portion 50, and also makes it possible to easily attach and detach the soundproof wall 60.

[0075] (10) According to the tenth aspect, the steam turbine 5 is the steam turbine 5 of (9), and is provided with a first vibration-damping sheet 81A covering the outer surface 64a of the support plate portion 64 facing the anti-noise source side Dad, which is opposite the axial noise source side Dau in the axial direction Da, and the inner circumferential plate portion 66 of the frame 61 is spaced apart from the ground portion 40 and the bellows portion 50 in the radial direction Dr, and the first vibration-damping sheet 81A is in contact with the ground portion 40 or the bellows portion 50. An example of the gland portion 40 is a gland flange 41. An example of the bellows portion 50 is an inner bellows portion flange 53 for fixing a bellows main body portion 51 to the gland flange 41. This allows the first vibration-proof sheet 81A to close the gap between the inner circumferential plate portion 66 and the gland flange 41 or the inner bellows flange 53. Therefore, it is possible to suppress the transmission of noise to the anti-noise source side Dad through the gap between the inner circumferential plate portion 66 and the gland flange 41 or the inner bellows flange 53.

[0076] (11) According to an eleventh aspect, the steam turbine 5 is a steam turbine 5 of (9) or (10), and is provided with a first vibration-damping sheet 81A covering the outer surface 64a of the support plate portion 64 facing the anti-noise source side Dad, which is opposite the axial noise source side Dau in the axial direction Da, and the first vibration-damping sheet 81A is in contact with the inner side of the inner casing 21 of the steam turbine casing 20. This makes it possible to suppress noise from being transmitted in the axial direction Da from between the outer peripheral plate portion 65 and the outer bellows portion flange 56b or the flange portion 54 in the radial direction Dr. [Industrial Applicability]

[0077] According to the above-mentioned soundproof wall and steam turbine, the soundproofing performance can be improved. [Explanation of symbols]

[0078] 5...steam turbine 10a...first steam turbine section 10b...second steam turbine section 11...turbine rotor 12...rotor shaft 12a...inner surface 13...moving blade row 17...stationary blade row 18...bearing 19...steam inlet pipe 20...casing 21...inner casing 21s...first space 26...diffuser 26s...diffuser space 27...outer diffuser 29...inner diffuser 30...outer casing 30s...second space 31...exhaust port 32...pipe 40...gland section 41...gland flange 50...bellows section 51...bellows main body section 51u...end section 52...bellows support section 53...inner bellows section flange 54...flange section 55...first support section 55o...end section 56...second support section 56d...end section 56b...outer bellows section flange 57...fastener 58...protrusion 60...soundproof wall 61...frame 61A...first frame 61B...second frame 61C...third frame 61D...fourth frame 62...sound-absorbing material 63...movement restriction member 64...support plate portion 64a...outer surface 65...outer peripheral plate portion 66...inner peripheral plate portion 67...first side plate portion 68...second side plate portion 69...outer peripheral edge 70...inner peripheral edge 71...first side edge 72...second side edge 73...sound-absorbing material accommodating space 74...partition plate portion 76...sound-absorbing material holding member 77...fixing member 78...through hole 80...sound-insulating plate material 81...vibration-proof sheet 81A...first vibration-proof sheet 81B...second vibration-proof sheet 83,84...gap 85...fastener 90...annular space

Claims

1. A soundproof wall disposed in an annular space on the outer periphery of a rotating shaft that can rotate around an axis, A frame disposed in the annular space; A sound absorbing material supported by the frame; a movement restricting member that restricts the sound absorbing material from moving toward an axial noise source side, the axial noise source side being one of the two sides in the axial direction in which the axis extends; Equipped with The frame is A support plate portion extending in a circumferential direction around the axis and expanding in a radial direction around the axis; an outer circumferential plate portion extending from an outer end of the support plate portion in the radial direction toward the axial noise source and extending in the circumferential direction; an inner circumferential plate portion extending from an inner end of the support plate portion in the radial direction toward the axial noise source side and extending in the circumferential direction; Equipped with The sound absorbing material is The sound absorbing material is accommodated in a sound absorbing material accommodation space defined by the support plate portion, the outer peripheral plate portion, and the inner peripheral plate portion, The movement restricting member is a sound absorbing material pressing member that is in contact with the sound absorbing material only at a position away from the outer peripheral plate portion and the inner peripheral plate portion and cannot move relatively in the axial direction with respect to the support plate portion, a plurality of the frames arranged in a circle in the circumferential direction, The frame is a first side plate portion extending radially inward from an end of the outer circumferential plate portion on the first side in the circumferential direction and connected to an end of the inner circumferential plate portion on the first side in the circumferential direction and connected to an end of the support plate portion on the first side in the circumferential direction; a second side plate portion extending radially inward from an end of the outer circumferential plate portion on the second side in the circumferential direction and connected to an end of the inner circumferential plate portion on the second side in the circumferential direction and connected to an end of the support plate portion on the second side in the circumferential direction; Equipped with the sound-absorbing material accommodating space is defined by the support plate portion, the outer peripheral plate portion, the inner peripheral plate portion, the first side plate portion, and the second side plate portion; The sound absorbing material pressing member is The sound absorbing material is in contact with the outer circumferential plate portion, the inner circumferential plate portion, the first side plate portion, and the second side plate portion only at positions away from the outer circumferential plate portion, the inner circumferential plate portion, the first side plate portion, and the second side plate portion. Soundproof wall.

2. A soundproof wall disposed in an annular space on the outer periphery of a rotating shaft that can rotate around an axis, A frame disposed in the annular space; A sound absorbing material supported by the frame; a movement restricting member that restricts the sound absorbing material from moving toward an axial noise source side, the axial noise source side being one of the two sides in the axial direction in which the axis extends; Equipped with The frame is A support plate portion extending in a circumferential direction around the axis and expanding in a radial direction around the axis; an outer circumferential plate portion extending from an outer end of the support plate portion in the radial direction toward the axial noise source and extending in the circumferential direction; an inner circumferential plate portion extending from an inner end of the support plate portion in the radial direction toward the axial noise source side and extending in the circumferential direction; Equipped with The sound absorbing material is The sound absorbing material is accommodated in a sound absorbing material accommodation space defined by the support plate portion, the outer peripheral plate portion, and the inner peripheral plate portion, The movement restricting member is a sound absorbing material pressing member that is in contact with the sound absorbing material only at a position away from the outer peripheral plate portion and the inner peripheral plate portion and cannot move relatively in the axial direction with respect to the support plate portion, a first vibration-isolating sheet for covering an outer surface of the support plate portion facing the anti-noise source side, which is the opposite side to the axial noise source side in the axial direction; Soundproof wall.

3. A soundproof wall disposed in an annular space on the outer periphery of a rotating shaft that can rotate around an axis, A frame disposed in the annular space; A sound absorbing material supported by the frame; a movement restricting member that restricts the sound absorbing material from moving toward an axial noise source side, the axial noise source side being one of the two sides in the axial direction in which the axis extends; Equipped with The frame is A support plate portion extending in a circumferential direction around the axis and expanding in a radial direction around the axis; an outer circumferential plate portion extending from an outer end of the support plate portion in the radial direction toward the axial noise source and extending in the circumferential direction; an inner circumferential plate portion extending from an inner end of the support plate portion in the radial direction toward the axial noise source side and extending in the circumferential direction; Equipped with The sound absorbing material is The sound absorbing material is accommodated in a sound absorbing material accommodation space defined by the support plate portion, the outer peripheral plate portion, and the inner peripheral plate portion, The movement restricting member is a sound absorbing material pressing member that is in contact with the sound absorbing material only at a position away from the outer peripheral plate portion and the inner peripheral plate portion and cannot move relatively in the axial direction with respect to the support plate portion, a plurality of the frames arranged in a circle in the circumferential direction, a first vibration-isolating sheet covering an outer surface of the support plate portion facing an anti-noise source side that is opposite to the axial noise source side in the axial direction; a second vibration-proof sheet that blocks the gaps between the support plate portions adjacent to each other in the circumferential direction from the noise source side; Soundproof wall.

4. The movement restricting member is a fixing member that is fixed to the support plate portion and extends from the support plate portion toward the axial noise source side and penetrates the sound absorbing material, The sound absorbing material pressing member is attached to the fixing member. A soundproof wall according to any one of claims 1 to 3.

5. The sound-absorbing material is accommodated in the sound-absorbing material accommodation space in a plurality of rows aligned in the axial direction, A sound-proof plate material is provided between the sound-absorbing materials adjacent to each other in the axial direction, the sound-proof plate material extending in the circumferential direction and expanding in the radial direction. A soundproof wall according to any one of claims 1 to 3.

6. a steam turbine rotor rotatable about an axis; a steam turbine casing arranged on an outer circumferential side of the steam turbine rotor; a gland portion that seals a periphery of the steam turbine rotor; a bellows portion that closes a gap between the gland portion and the steam turbine casing while allowing relative displacement between the gland portion and the steam turbine casing in an axial direction along which the axis extends; a soundproof wall disposed in an annular space on an outer circumferential side of the steam turbine rotor as a rotating shaft, The soundproof wall is A frame disposed in the annular space; A sound absorbing material supported by the frame; a movement restricting member that restricts the sound absorbing material from moving toward an axial noise source side, the axial noise source side being one of the two sides in the axial direction in which the axis extends; Equipped with The frame is A support plate portion extending in a circumferential direction around the axis and expanding in a radial direction around the axis; an outer circumferential plate portion extending from an outer end of the support plate portion in the radial direction toward the axial noise source and extending in the circumferential direction; an inner circumferential plate portion extending from an inner end of the support plate portion in the radial direction toward the axial noise source side and extending in the circumferential direction; Equipped with The sound absorbing material is The sound absorbing material is accommodated in a sound absorbing material accommodation space defined by the support plate portion, the outer peripheral plate portion, and the inner peripheral plate portion, The movement restricting member is a sound absorbing material pressing member that is in contact with the sound absorbing material only at a position away from the outer peripheral plate portion and the inner peripheral plate portion and cannot move relatively in the axial direction with respect to the support plate portion, a first vibration-isolating sheet covering an outer surface of the support plate portion facing an anti-noise source side that is opposite to the axial noise source side in the axial direction, the annular space is formed between the gland portion and the steam turbine casing in the radial direction, The bellows portion is a bellows body portion connected to the gland portion and extending in the axial direction; a bellows support portion extending from an end of the bellows body opposite to the gland portion toward an outer periphery and connected to a flange portion of the steam turbine casing; Equipped with The soundproof wall is supported only from the radially outer side of the bellows support portion, the inner peripheral plate portion of the frame is spaced apart from the gland portion and the bellows portion in the radial direction, The first vibration-isolating sheet is in contact with the gland portion or the bellows portion of the steam turbine.

7. A steam turbine rotor rotatable about an axis; a steam turbine casing arranged on an outer circumferential side of the steam turbine rotor; a gland portion that seals a periphery of the steam turbine rotor; a bellows portion that closes a gap between the gland portion and the steam turbine casing while allowing relative displacement between the gland portion and the steam turbine casing in an axial direction along which the axis extends; a soundproof wall disposed in an annular space on an outer circumferential side of the steam turbine rotor as a rotating shaft, The soundproof wall is A frame disposed in the annular space; A sound absorbing material supported by the frame; a movement restricting member that restricts the sound absorbing material from moving toward an axial noise source side, the axial noise source side being one of the two sides in the axial direction in which the axis extends; Equipped with The frame is A support plate portion extending in a circumferential direction around the axis and expanding in a radial direction around the axis; an outer circumferential plate portion extending from an outer end of the support plate portion in the radial direction toward the axial noise source and extending in the circumferential direction; an inner circumferential plate portion extending from an inner end of the support plate portion in the radial direction toward the axial noise source side and extending in the circumferential direction; Equipped with The sound absorbing material is The sound absorbing material is accommodated in a sound absorbing material accommodation space defined by the support plate portion, the outer peripheral plate portion, and the inner peripheral plate portion, The movement restricting member is a sound absorbing material pressing member that is in contact with the sound absorbing material only at a position away from the outer peripheral plate portion and the inner peripheral plate portion and cannot move relatively in the axial direction with respect to the support plate portion, a first vibration-isolating sheet covering an outer surface of the support plate portion facing an anti-noise source side that is opposite to the axial noise source side in the axial direction, the annular space is formed between the gland portion and the steam turbine casing in the radial direction, The bellows portion is a bellows body portion connected to the gland portion and extending in the axial direction; a bellows support portion extending from an end of the bellows body opposite to the gland portion toward an outer periphery and connected to a flange portion of the steam turbine casing; Equipped with The soundproof wall is supported only from the radially outer side of the bellows support portion, The first vibration-proof sheet is in contact with an inner peripheral side of an inner casing of the steam turbine casing. Steam turbine.

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