silencer

Abstract

To reduce radiated sound due to vibration of a sound absorption splitter.SOLUTION: A silencer includes a plurality of sound absorption splitters which are arranged along a first direction in which a sound wave from a sound source is propagated and are aligned in a second direction crossing the first direction. At least one sound absorption splitter includes a sound source side portion and a tip side portion, which are aligned in the first direction. The dimension of the sound source side portion in the second direction is the same or almost the same as the dimension of the tip side portion in the second direction. The sound source side portion and the tip side portion are arranged with an interval in the first direction. Sound absorption materials are provided in the inside of the sound source side portion and the inside of the tip side portion. In the sound source side portion and the tip side portion, pores are formed on top faces being ends in a third direction orthogonal to the first direction and the second direction.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present disclosure relates to a silencer. [Background technology]

[0002] In the ducts of gas turbines, silencers are arranged to reduce sound waves propagating from the gas turbine, which is a noise source. Known silencers include, for example, a configuration in which multiple sound-absorbing splitters are arranged (see, for example, Patent Documents 1 and 2). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Special Publication No. 2017-531143 [Patent Document 2] Japanese Patent Application Laid-Open No. 2017-062465 Summary of the Invention [Problem to be solved by the invention]

[0004] In the silencer described above, it is required to reduce the radiated sound caused by the vibration of the sound-absorbing splitter.

[0005] The present disclosure has been made in view of the above, and aims to provide a silencer that can reduce radiated sound caused by vibration of a sound-absorbing splitter. [Means for solving the problem]

[0006] The silencer according to the present disclosure has a plurality of sound-absorbing splitters arranged along a first direction in which sound waves from a sound source propagate and aligned in a second direction intersecting the first direction, and at least one of the sound-absorbing splitters has a sound-source-side portion and a tip-side portion aligned in the first direction, the dimension of the sound-source-side portion in the second direction being the same or nearly the same as the dimension of the tip-side portion in the second direction, and the sound-source-side portion and the tip-side portion are arranged with a gap in the first direction so that vibrations propagating from the sound-source-side portion to the tip-side portion are suppressed when the sound-source-side portion is vibrated by sound waves from the sound source. [Effects of the Invention]

[0007] According to the present disclosure, it is possible to reduce radiated sound caused by vibration of the sound-absorbing splitter. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is a perspective view showing an example of a silencer according to the present embodiment. [Figure 2] FIG. 2 is a perspective view schematically showing the configuration of a silencer according to a modified example. [Figure 3] FIG. 3 is a perspective view schematically showing the configuration of a silencer according to a modified example. [Figure 4] FIG. 4 is a perspective view schematically showing the configuration of a silencer according to a modified example. [Figure 5] FIG. 5 is a perspective view schematically showing the configuration of a silencer according to a modified example. [Figure 6] FIG. 6 is a view taken along the line AA′ in FIG. [Figure 7] FIG. 7 is a perspective view schematically showing the configuration of a silencer according to a modified example. [Figure 8] FIG. 8 is a perspective view schematically showing the configuration of a silencer according to a modified example. [Figure 9] FIG. 9 is a perspective view schematically showing the configuration of a silencer according to a modified example. DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, an embodiment of a silencer according to the present disclosure will be described with reference to the drawings. Note that the present invention is not limited to this embodiment. Furthermore, the components in the following embodiments include those that are easily replaceable by a person skilled in the art, or those that are substantially identical.

[0010] Fig. 1 is a perspective view showing an example of a silencer 100 according to this embodiment. The silencer 100 shown in Fig. 1 is used to reduce sound waves from a sound source. In this embodiment, an example will be described in which the silencer 100 is disposed at an intake port 50a of a duct 50 of a gas turbine.

[0011] As shown in FIG. 1 , the silencer 100 has multiple sound-absorbing splitters 10. The multiple sound-absorbing splitters 10 are arranged along a first direction D1 in which sound waves propagate, and are spaced apart in a second direction D2 perpendicular to the first direction D1. Hereinafter, when describing the direction of the sound-absorbing splitter 10, the rear side in which sound waves propagate in the first direction D1 will be referred to as the sound source side, and the front side in which sound waves propagate will be referred to as the tip side. In this embodiment, air drawn in through the intake port 50a flows toward the gas turbine. In other words, the propagation direction of sound waves from the sound source and the flow direction of air are opposite. In this configuration, the gas turbine, which is the sound source, is arranged downstream of the silencer 100 in the air flow direction.

[0012] Each sound-absorbing splitter 10 has a sound-source-side portion 11 and a tip-side portion 12. The sound-source-side portion 11 is disposed on the sound source side in the first direction D1. The sound-source-side portion 11 is formed of a metal such as aluminum and is hollow. The sound-source-side portion 11 may be provided with a sound-absorbing material on its surface or inside.

[0013] The tip side portion 12 is disposed on the tip side in the first direction D1. The tip side portion 12 is formed of a metal such as aluminum and is hollow inside. The tip side portion 12 may be provided with a sound absorbing material on the surface or inside. The tip side portion 12 is provided with a rectifying plate 12r (see FIG. 7) that is curved so as to be convex toward the tip side in the first direction D1. The rectifying plate 12r is disposed on the upstream side in the air flow direction.

[0014] When the silencer 100 is disposed at the intake port 50a of the duct 50, the tip side portion 12 is disposed on the intake port 50a side of the duct 50, and the sound source side portion 11 is disposed on the inner side of the duct 50 (gas turbine side).

[0015] In each sound-absorbing splitter 10, the dimension of the sound source side portion 11 in the second direction D2 is the same as or approximately the same as the dimension of the tip side portion 12 in the second direction D2. The sound source side portion 11 and the tip side portion 12 are arranged separated by a gap 13 in the first direction D1 so that when the sound source side portion 11 is vibrated by sound waves from the sound source, vibrations propagating from the sound source side portion 11 to the tip side portion 12 are suppressed.

[0016] 1 absorbs sound waves propagating from a gas turbine, which is a sound source, through a duct 50, thereby reducing the sound pressure level. The silencer 100 of this embodiment absorbs sound waves at the intake port 50a of the duct 50 so as to reduce the sound pressure level by, for example, 30 dB or more, and in some cases, 40 dB or more.

[0017] The sound waves passing through the silencer 100 include two types of sound waves: direct sound waves that propagate through the air from the sound source and are partially absorbed by the silencer 100; and radiated sound (secondary solid sound) that occurs when the duct 50 and each sound-absorbing splitter 10 are vibrated by the sound waves from the sound source, and the vibrations are radiated from the intake port 50a side of the duct 50.

[0018] The silencer 100 of this embodiment, which exhibits a high sound absorption performance capable of reducing sound pressure levels by 30 dB or more, is used when the sound pressure level of the sound waves from the sound source is high, and the length in the first direction D1 tends to be long. In such cases, the sound radiated from the sound-absorbing splitter 10 becomes too loud to ignore.

[0019] The silencer 100 of this embodiment is configured such that the sound-absorbing splitter 10 has a sound-source-side portion 11 and a tip-side portion 12, and the sound-source-side portion 11 and the tip-side portion 12 are separated in the first direction D1 by a gap 13. When the silencer 100 of this embodiment is used, the sound-source-side portion 11 is excited and vibrates by sound waves from the sound source, but the vibration of the sound-source-side portion 11 is attenuated by the gap 13, and therefore propagation of the vibration to the tip-side portion 12 is suppressed. As a result, radiated sound contained in sound waves that pass through the silencer 100 is reduced. Furthermore, because the dimension of the sound-source-side portion 11 in the second direction is the same or nearly the same as the dimension of the tip-side portion 12 in the second direction, desired sound absorption characteristics are ensured when absorbing direct sound.

[0020] In each sound-absorbing splitter 10, the position in the first direction D1 where the gap 13 is provided can be set as appropriate. In the example shown in FIG. 1 , the gap 13 is provided closer to the tip than the center of the sound-absorbing splitter 10 in the first direction D1. This configuration makes it possible to appropriately attenuate vibrations from the sound-source-side portion 11. Furthermore, the dimension of the gap 13 in the first direction D1 can also be set as appropriate. By reducing the dimension of the gap 13 in the first direction D1, the overall dimension of the silencer 100 in the first direction can be reduced.

[0021] As described above, the silencer 100 of this embodiment is arranged along a first direction D1 in which sound waves from the sound source propagate, and has a plurality of sound-absorbing splitters 10 lined up in a second direction D2 that intersects the first direction D1, and at least one sound-absorbing splitter 10 has a sound source side portion 11 and a tip side portion 12 lined up in the first direction D1, and the dimension of the sound source side portion 11 in the second direction is the same or almost the same as the dimension of the tip side portion 12 in the second direction D2, and the sound source side portion 11 and the tip side portion 12 are arranged with a gap 13 in the first direction so that when the sound source side portion 11 is vibrated by sound waves from the sound source, the vibrations propagating from the sound source side portion 11 to the tip side portion 12 are suppressed.

[0022] Therefore, when the sound source side portion 11 is excited and vibrates by sound waves from the sound source, the vibration of the sound source side portion 11 is attenuated by the gap 13, and therefore propagation of the vibration to the tip side portion 12 can be suppressed. This makes it possible to reduce radiated sound contained in sound waves that have passed through the silencer 100. Furthermore, because the dimension in the second direction of the sound source side portion 11 is the same or nearly the same as the dimension in the second direction of the tip side portion 12, it is possible to ensure desired sound absorption characteristics when absorbing direct sound.

[0023] Furthermore, in the silencer 100 according to this embodiment, the multiple sound-absorbing splitters 10 are arranged at the intake port 50a of the duct 50 connected to the gas turbine. This configuration can reduce the sound waves of direct sound from the gas turbine and the sound waves of secondary structure-borne sound caused by acoustic excitation of the duct 50 and the sound-absorbing splitters 10 by the direct sound.

[0024] In the present embodiment, a configuration has been described in which each of the multiple sound-absorbing splitters 10 has a sound-source-side portion 11 and a tip-side portion 12 that are separated by a gap 13 in the first direction D1, but the present invention is not limited to this. It is sufficient that at least one of the multiple sound-absorbing splitters 10 has a sound-source-side portion 11 and a tip-side portion 12 that are separated by a gap 13 in the first direction D1.

[0025] Fig. 2 is a perspective view schematically showing the configuration of a silencer 100A according to a modified example. In the silencer 100A shown in Fig. 2, the sound-absorbing splitter 10A has a sound source-side portion 11 and a tip-side portion 12 connected via an elastic body 14. With this configuration, the propagation of vibration from the sound source-side portion 11 to the tip-side portion 12 can be more efficiently suppressed.

[0026] Fig. 3 is a perspective view schematically showing the configuration of a silencer 100B according to a modified example. In the silencer 100B shown in Fig. 3, the sound-absorbing splitter 10B has a sound source side portion 11 and a tip side portion 12 connected via an elastic body 14. The tip side portion 12 is elastically supported by an external structure via an elastic body 15. An example of the external structure is the inner wall of a duct 50. With this configuration, propagation of vibration from the sound source side portion 11 to the tip side portion 12 can be more efficiently suppressed, thereby suppressing vibration of the tip side portion 12.

[0027] Fig. 4 is a perspective view schematically showing the configuration of a silencer 100C according to a modified example. In the silencer 100C shown in Fig. 4, the sound-absorbing splitter 10C has a sound-source-side portion 11 and a tip-side portion 12 connected via an expansion joint 16 or a leaf spring 17. This configuration can more efficiently suppress the propagation of vibration from the sound-source-side portion 11 to the tip-side portion 12. Note that the silencer 100C may have a configuration in which the sound-source-side portion 11 and the tip-side portion 12 are connected via an expansion joint 16 or a leaf spring 17 in at least one of the multiple sound-absorbing splitters 10C.

[0028] Fig. 5 is a perspective view schematically illustrating the configuration of a silencer 100D according to a modified example. In the silencer 100D shown in Fig. 5, the sound-absorbing splitter 10D has a sound-source-side portion 11D and a tip-side portion 12D, each of which has a sound-absorbing portion 18 on its upper surface 11u, 12u, which is the end portion in a third direction D3 perpendicular to the first direction D1 and the second direction D2. The sound-absorbing portion 18 is, for example, a hole formed in the upper surface 11u, 12u. The sound-absorbing portion 18 may be a sound-absorbing material or the like.

[0029] Fig. 6 is a view taken along the line AA' in Fig. 5. As shown in Fig. 6, by providing the sound-absorbing portion 18 on the upper surface 11u of the sound source side portion 11D and the upper surface 12u of the tip side portion 12D, sound waves passing between the upper surfaces 11u, 12u and the ceiling portion 50b of the duct 50 can be efficiently absorbed. In this configuration, a sound-absorbing material or the like may be placed on the ceiling portion 50b. Furthermore, a configuration similar to the sound-absorbing portion 18 may be provided on the opposing surfaces 11p, 12p of the sound source side portion 11D and the tip side portion 12D.

[0030] Fig. 7 is a perspective view showing a silencer 100E according to a modified example. In the silencer 100E shown in Fig. 7, the sound-absorbing splitter 10E has a distal end portion 12E filled with a filler 19 such as a sound-absorbing material such as urethane, or a vibration-damping material such as mortar or an iron plate.

[0031] In the example shown in Figure 7, the filler 19 is arranged inside the straightening plate 12r, but this is not limited to this, and the filler 19 may also be arranged in the main body portion 12h of the tip side portion 12E.

[0032] If the filler 19 is a sound absorbing material, acoustic resonance in the tip end portion 12E can be suppressed, thereby suppressing the generation of radiated sound. If the filler 19 is a vibration damping material, vibration in the tip end portion 12E can be more reliably suppressed.

[0033] Fig. 8 is a perspective view schematically illustrating the configuration of a silencer 100F according to a modified example. In the silencer 100F shown in Fig. 8, the sound-absorbing splitter 10F has a rectifying plate 12r at a tip end portion 12F, whose interior is hollow and has a lower pressure than the exterior. In this configuration, the lower pressure inside the rectifying plate 12r can suppress vibrations in the rectifying plate 12r.

[0034] FIG. 9 is a perspective view schematically illustrating the configuration of a silencer 100G according to a modified example. In the silencer 100G illustrated in FIG. 9, the sound-absorbing splitter 10G includes acoustic resonance devices 20 and 21, each of which opens in the second direction D2, disposed between the sound source-side portion 11 and the distal end portion 12. The acoustic resonance device 20 has a rectangular cylindrical shape and has openings 20a and 20b on both sides in the second direction D2. The acoustic resonance device 21 has a configuration similar to that of a resonator, for example, and includes a hollow portion 21a that resonates sound and an absorbing portion 21b that absorbs sound. An opening 21c is provided at the end of the absorbing portion 21b. The acoustic resonance devices 20 and 21 are supported in a vibration-isolating manner by, for example, an elastic member. The acoustic resonance devices 20 and 21 may be disposed inside at least one of the sound source-side portion 11 and the distal end portion 12. This configuration more reliably suppresses vibration propagation from the sound source-side portion 11 to the distal end portion 12.

[0035] The technical scope of the present invention is not limited to the above-described embodiments, and appropriate modifications can be made without departing from the spirit of the present invention. For example, in the above-described embodiments, a gas turbine is used as an example of a mechanical device that is a sound source, but the present invention is not limited to this. The mechanical device that is a sound source may be another device, such as an exhaust fan.

[0036] Furthermore, in the above embodiment, the silencer (100, 100A, 100B, 100C, 100D, 100E, 100F, 100G) is disposed at the intake port 50a of the duct 50 connected to the machinery (gas turbine). However, the present invention is not limited to this. The silencer may be disposed at, for example, the exhaust port of the duct connected to the machinery. That is, the silencer can be disposed at either the intake port or the exhaust port, as long as it is an opening of the duct connected to the machinery. When the silencer is disposed at the exhaust port of the duct, the air flows from the machinery side to the exhaust port side. Therefore, the machinery, which is the sound source, is disposed upstream of the silencer in the air flow direction. In this configuration, the straightening plate may be disposed at, for example, the rear end of the sound-absorbing splitter in the first direction D1 in which sound waves propagate (the rear end of the sound source portion). [Explanation of symbols]

[0037] 10, 10A, 10B, 10C, 10D, 10E, 10F, 10G Sound-absorbing splitter 11,11D Sound source side part 11p,12p Opposite side 11u,12u top surface 12,12D,12E,12F Tip side part 12r rectifier plate 13 intervals 14,15 Elastic bodies 16 Expansion joint 17 Leaf spring 18 Sound-absorbing processed part (sound-absorbing hole) 19 Filling 20,21 Acoustic Resonance Devices 20a,20b,21a opening 50 Duct 50a intake 50b Ceiling section 100, 100A, 100B, 100C, 100D, 100E, 100F, 100G silencer D1 1st direction D2 2nd direction D3 Third direction

Claims

1. a plurality of sound-absorbing splitters arranged along a first direction in which sound waves from a sound source propagate and aligned in a second direction intersecting the first direction; At least one of the sound-absorbing splitters has a sound source side portion and a tip side portion aligned in the first direction, a dimension of the sound source side portion in the second direction is the same as or substantially the same as a dimension of the tip side portion in the second direction, and the sound source side portion and the tip side portion are arranged with a gap therebetween in the first direction, a sound-absorbing material is provided inside the sound source side portion and inside the tip side portion; the sound source side portion and the tip side portion each have a hole formed on an upper surface that is an end portion in a third direction perpendicular to the first direction and the second direction, a current plate that is curved so as to be convex toward the tip side in the first direction is provided continuously with the tip side portion, The sound source side portion and the tip side portion are installed on an inner surface below the third direction inside a duct connected to a mechanical device that is the sound source, and extend in the first direction and the third direction. Silencer.

2. a plurality of the sound-absorbing splitters are disposed inside a duct connected to a mechanical device that is the sound source; The hole is disposed so as to face the ceiling of the duct. The silencer according to claim 1.

3. The holes are arranged in plural in the first direction and in plural in the second direction. The silencer according to claim 1.

4. The holes are arranged in rows at equal intervals in the first direction, and a plurality of rows are provided in the second direction. Between the rows adjacent to each other in the second direction, the positions of the holes are shifted by half a pitch in the first direction. The silencer according to claim 3.

5. The rectifying plate has a hollow interior. The silencer according to claim 1.

6. The hole portion is not arranged on the upper surface which is the end portion in the third direction of the rectifying plate. The silencer according to claim 1.

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