Noise suppression device

Abstract

To appropriately suppress noise in power generation facilities equipped with power generating units that are covered by enclosures.SOLUTION: A noise suppression device is removably installed in a power generation facility having an enclosure with a vent that is at least one of an intake port and an exhaust port, and a power generation unit covered by the enclosure, the noise suppression device comprising a tubular member that has a first aperture opening in a different direction from the vent and a second aperture opening toward the vent and forms a flow path of gas from the first aperture to the second aperture, with an acoustic liner formed in the flow path. The tubular member is formed so that the flow path bends at a plurality of locations.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present disclosure relates to noise suppression devices. [Background technology]

[0002] In devices that generate noise, such as power generation engines, a configuration is known in which noise is reduced by providing a sound absorbing device at a location from which sound is emitted, such as an air vent (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Utility Model Application Publication No. 4-125620 Summary of the Invention [Problem to be solved by the invention]

[0004] In devices that generate noise, such as the above-mentioned power generation engine, a configuration is required that can appropriately suppress the generated noise.

[0005] The present disclosure has been made in view of the above, and aims to provide a noise suppression device that can appropriately suppress noise in a power generation facility that includes a power generation unit covered by an enclosure. [Means for solving the problem]

[0006] The noise reduction device of the present disclosure is a noise reduction device that is detachably installed on a power generation facility that includes an enclosure having at least one air vent, either an intake or exhaust port, and a power generation unit that is covered by the enclosure, and includes a tubular member that has a first opening that opens in a direction different from the air vent and a second opening that opens toward the air vent, and that forms a gas flow path from the first opening to the second opening and has an acoustic liner formed within the flow path, and the tubular member is formed so that the flow path is bent at multiple points. [Effects of the Invention]

[0007] According to the present disclosure, it is possible to appropriately suppress noise in a power generation facility that includes a power generation unit that is enclosed in an enclosure. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is a perspective view that schematically shows an example of a power generation facility to which a noise suppression device according to this embodiment is applied. [Figure 2] FIG. 2 is a diagram showing an example of a noise suppression device when the housing is viewed from the -Y side. [Figure 3] FIG. 3 is a diagram showing the configuration along the cross section AA in FIG. [Figure 4] FIG. 4 is a diagram showing the configuration of a noise suppression device according to one modified example. [Figure 5] FIG. 5 is a diagram showing the configuration of a noise suppression device according to another modified example. [Figure 6] FIG. 6 is a diagram showing the configuration of a noise suppression device according to another modified example. [Figure 7] FIG. 7 is a diagram showing an example of a noise suppression device when the housing is viewed from the +Z side. [Figure 8] FIG. 8 is a diagram showing the configuration along the cross section BB in FIG. [Figure 9] FIG. 9 is a diagram showing a configuration along the CC cross section in FIG. DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, an embodiment of a noise suppression device 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 those skilled in the art, or those that are substantially identical.

[0010] 1 is a perspective view that schematically shows an example of a power generation facility 100 to which noise suppression devices 30, 40 according to this embodiment are applied. In the following explanation, the longitudinal direction of the power generation facility 100 (the left-right direction in FIG. 1) is defined as the X direction, the lateral direction of the power generation facility 100 (the depth direction in FIG. 1) is defined as the Y direction, and the height direction of the power generation facility 100 (the up-down direction in FIG. 1) is defined as the Z direction. In addition, in each coordinate system, the direction indicated by the arrow is defined as the + direction, and the direction opposite to the arrow is defined as the - direction.

[0011] 1, the power generation facility 100 includes an enclosure 10 and a power generation unit 20. The power generation unit 20 is disposed inside the enclosure 10 and is covered by the enclosure 10.

[0012] The enclosure 10 includes a base plate 11, a housing 12, an intake duct 13, and an exhaust duct 14. The base plate 11 has a rectangular plate shape in a plan view, and is placed on a floor surface F. The housing 12 has, for example, a rectangular box shape.

[0013] The intake duct 13 draws air from outside the enclosure 10 into the enclosure 10. The intake duct 13 has an intake port 13a facing the outside. The intake port 13a is disposed on one of the side surfaces of the housing 12, for example, on the −Y side surface 12a.

[0014] The exhaust duct 14 exhausts the air inside the enclosure 10 to the outside of the enclosure 10. The exhaust duct 14 has an exhaust port 14a facing the outside. The exhaust port 14a is arranged, for example, on a surface 12b (the surface on the +Z side) that serves as the ceiling of the housing 12.

[0015] The power generation unit 20 includes a generator 21 and a power generation source 22. The generator 21 and the power generation source 22 are arranged on, for example, the bed plate 11. The power generation source 22 has an engine such as a diesel engine. The generator 21 is drivingly connected to the engine of the power generation source 22. The generator 21 is driven by the rotational driving force of the engine transmitted thereto, and generates electric power when driven.

[0016] In the enclosure 10, air flows in through the intake port 13a of the intake duct 13, passes through the power generation unit 20, and is exhausted from the exhaust port 14a of the exhaust duct 14. In the enclosure 10, an air flow path is formed between the intake port 13a and the exhaust port 14a. The intake port 13a and the exhaust port 14a are used as an air vent 15.

[0017] The noise reduction device 30 is disposed around the intake port 13a. The noise reduction device 30 suppresses noise emitted from the intake port 13a. FIG. 2 is a diagram schematically showing an example of the noise reduction device 30 when the housing 12 is viewed from the -Y side. FIG. 2 shows the internal configuration through the surface on the -Y side. FIG. 3 is a diagram showing the configuration along the AA cross section in FIG. 2. As shown in FIGS. 2 and 3, the noise reduction device 30 has a tubular member 31 and an acoustic damper 32.

[0018] The tubular member 31 has a first opening 31a and a second opening 31b. The first opening 31a opens in a different direction from the intake port 13a. The second opening 31b opens toward the intake port 13a. The tubular member 31 has a wall 33. The tubular member 31 forms a gas flow path R1 from the first opening 31a to the second opening 31b by the wall 33. The tubular member 31 is formed so that the flow path R1 is bent at multiple locations.

[0019] Tubular member 31 is disposed at a position surrounding air intake 13a when viewed from a direction perpendicular to face 12a (surface) on the -Y side of housing 12 of enclosure 10. In this embodiment, noise reduction device 30 is disposed in a rectangular ring shape so as to surround the four sides of rectangular air intake 13a.

[0020] For example, a plurality of tubular members 31 are provided. In this embodiment, noise reduction device 30 has tubular member 31 (hereinafter referred to as tubular member 34) arranged at the upper left of air intake port 13a in the drawing, tubular member 31 (hereinafter referred to as tubular member 35) arranged at the upper right of air intake port 13a in the drawing, tubular member 31 (hereinafter referred to as tubular member 36) arranged at the lower left of air intake port 13a in the drawing, and tubular member 31 (hereinafter referred to as tubular member 37) arranged at the lower right of air intake port 13a in the drawing.

[0021] The tubular member 34 has a second opening 34b that opens in the -Z direction toward the intake port 13a. The tubular member 34 extends linearly from the second opening 34b in the +Z direction along the surface 12a, is bent in the -X direction, and is folded back in the -Z direction. The tubular member 34 has a first opening 34a that opens in the -X direction at the tip of the folded back portion. The tubular member 34 is configured so that a part of the portion extending in the +Z direction from the second opening 34b (a portion including the end on the +Z side) and the folded back portion are adjacent to each other with the wall portion 33 interposed therebetween.

[0022] The tubular member 35 has a second opening 35b that opens in the -Z direction toward the intake port 13a. The tubular member 34 extends linearly from the second opening 35b in the +Z direction along the surface 12a, is bent in the +X direction, and is folded back in the -Z direction. The tubular member 35 has a first opening 35a that opens in the +X direction at the tip end (the tip end on the -Z side) of the folded back portion. The tubular member 35 is configured so that a part of the portion extending in the +Z direction from the second opening 35b (a portion including the end on the +Z side) and the folded back portion are adjacent to each other with the wall portion 33 interposed therebetween. Furthermore, the tubular members 34 and 35 are configured so that the portions extending in the +Z direction from the second opening 35b are adjacent to each other with the wall portion 33 interposed therebetween.

[0023] The tubular member 36 has a second opening 36b that opens in the +Z direction toward the intake port 13a. The tubular member 36 extends linearly from the second opening 36b in the -Z direction along the surface 12a, bends in the -X direction, and is folded back in the +Z direction. The tubular member 36 has a first opening 36a that opens in the -X direction at a portion of the folded back portion (the tip portion on the +Z side). The tubular member 36 is configured so that a portion of the portion extending from the second opening 36b in the +Z direction (a portion including the end portion on the +Z side) and the folded back portion are adjacent to each other via the wall portion 33. Furthermore, the tubular member 36 is configured so that a portion of the folded back portion (the tip portion on the +Z side) is adjacent to a portion of the tubular member 34 (the second opening 34b side of the folded back portion) via the wall portion 33.

[0024] The tubular member 37 has a second opening 37b that opens in the +Z direction toward the intake port 13a. The tubular member 37 extends linearly from the second opening 37b in the -Z direction along the surface 12a, is bent in the +X direction, and is folded back in the +Z direction. The tubular member 37 has a first opening 37a that opens in the +X direction at the tip of the folded back portion. The tubular member 37 is configured so that a part of the portion extending in the -Z direction from the second opening 37b (a portion including the end on the +Z side) and the folded back portion are adjacent to each other with the wall portion 33 interposed therebetween. Furthermore, the tubular members 34 and 35 are configured so that the portions extending in the +Z direction from the second opening 35b are adjacent to each other with the wall portion 33 interposed therebetween.

[0025] Each tubular member 31 extends from the second opening 31b in a direction along the surface 12a. That is, the tubular member 31 extends from the second opening 31b in the X direction, the Z direction, or a combined direction of the X and Z directions. This configuration reduces the dimension of the tubular member 31 in the Y direction.

[0026] Tubular member 31 may be disposed at a position symmetrical with respect to intake port 13a when viewed from a direction perpendicular to surface 12a. In this case, tubular member 31 may be disposed at a position symmetrical with respect to intake port 13a in the X direction, or at a position symmetrical with respect to both the X and Y directions.

[0027] The tubular member 31 has a plurality of through holes 31c formed along the flow path R1 to form an acoustic liner 38. The plurality of through holes 31c are, for example, circular, and are formed throughout the entire tubular member 31.

[0028] The acoustic damper 32 is disposed along the tubular member 31. In this embodiment, the acoustic damper 32 is provided on a wall portion 33 of the tubular member 31. Specifically, the wall portion 33 has a hollow portion 31d therein. The hollow portion 31d has an end portion on the first opening 31a side of the tubular member 31 closed, and an end portion on the second opening 31b side of the tubular member 31 connected to the flow path R1. With this configuration, the wall portion 33 is formed as the acoustic damper 32. In this embodiment, the hollow portion 31d is formed so that the cross-sectional area of ​​the transverse section is uniform or approximately uniform from the second opening 31b side to the first opening 31a side of the tubular member 31. Note that the acoustic damper 32 may be provided separately from the wall portion 33. In this case, the acoustic damper 32 can be disposed along the wall portion 33 on both sides of the direction in which the flow path R1 extends, either outside or inside the tubular member 31.

[0029] Fig. 4 is a diagram showing the configuration of a noise reduction device 30A according to one modification. While Fig. 4 shows only the configuration of the tubular member 31A on the upper left side of the figure, a similar explanation can be applied to the other tubular members. The noise reduction device 30A shown in Fig. 4 is formed so that the cross-sectional area of ​​the transverse section of the hollow portion 31d provided inside the wall portion 33A changes in the direction along the flow path R1. With this configuration, the frequency band in which noise emitted from the intake port 13a can be absorbed can be broadened compared to the noise reduction device 30 described above.

[0030] FIG. 5 is a diagram showing the configuration of a noise reduction device 30B according to another modification. While FIG. 5 only shows the configuration of the tubular member 31B on the upper left side of the figure, a similar explanation can be applied to the other tubular members. In the noise reduction device 30B shown in FIG. 5, the wall portion 33B of the tubular member 31B is plate-shaped and has a solid configuration without a hollow portion 31d. The tubular member 31B has partition portions 31e that separate the flow path R1 at multiple locations along the flow path R1. The flow path R1 of the tubular member 31B is divided into multiple spaces 31s by the partition portions 31e. The partition portions 31e are provided with communication holes 31f. The communication holes 31f connect adjacent spaces 31s. In this way, by dividing the flow path R1 into multiple spaces 31s by partitions 31e and providing communication holes 31f in each partition 31e to connect the spaces 31s, an acoustic damper 32 can be formed within the flow path R1.

[0031] FIG. 6 is a diagram showing the configuration of a noise suppression device 30C according to another modification. While FIG. 6 only shows the configuration of the tubular member 31C on the upper left side of the drawing, a similar explanation can be applied to the other tubular members. In the noise suppression device 30C shown in FIG. 6, the wall portion 33C of the tubular member 31C is plate-shaped and has a solid configuration without a hollow portion 31d. The tubular member 31C has a configuration in which a perforated plate 39 is disposed on the inner surface of the wall portion 33C. This configuration enables noise to be reduced efficiently.

[0032] The noise suppression devices 30, 30A, and 30B described above can be attached to and detached from the housing 12 of the enclosure 10 by means of an attachment portion (not shown) such as a magnet.

[0033] Returning to FIG. 1, the noise reduction device 40 is disposed at the exhaust port 14a. The noise reduction device 40 suppresses noise emitted from the exhaust port 14a. FIG. 7 is a diagram showing an example of the noise reduction device 40 when the housing 12 is viewed from the +Z side. FIG. 8 is a diagram showing a configuration along the BB cross section in FIG. 7. FIG. 9 is a diagram showing a configuration along the CC cross section in FIG. 7. As shown in FIGS. 7 to 9, the noise reduction device 40 has a tubular member 41, a cover member 42, and an acoustic damper 43.

[0034] The tubular member 41 is, for example, cylindrical and has a first opening 41a and a second opening 41b. The first opening 41a opens in a direction different from the exhaust port 14a. The second opening 41b opens toward the exhaust port 14a. The tubular member 41 has a cylindrical wall 44. The wall 44 of the tubular member 41 forms a gas flow path R2 from the first opening 41a to the second opening 41b. The flow path R2 is a flow path that extends a flow path formed inside the exhaust duct 14 to the outside of the exhaust duct 14 (outside the enclosure 10). The tubular member 41 is formed so that the flow path bends at multiple locations. The second opening 41b is provided in a range that overlaps with a portion of the exhaust port 14a when viewed from the +Z direction. A portion of the gas discharged from the exhaust port 14a flows into the tubular member 41 from the second opening 41b.

[0035] In the tubular member 41, the second opening 41b opens in the -Z direction so as to face the exhaust port 14a. The tubular member 41 extends from the second opening 41b in the +Z direction, bends in the +X direction, and then bends again in the +Z direction. In this manner, the tubular member 41 is provided so as to extend alternately in the +Z direction and the +X direction. The first opening 41a opens in a direction different from the exhaust port 14a, for example, in the +Z direction.

[0036] The tubular member 41 has a plurality of through holes 41c formed along the flow path R2 to form an acoustic liner 49. The plurality of through holes 41c are, for example, circular, and are formed throughout the entire tubular member 41.

[0037] The cover member 42 has an outer shell portion 45 and an inner wall portion 46. The outer shell portion 45 is arranged in an area covering a portion of the surface 12b of the housing 12 of the enclosure 10, including the exhaust port 14a. The outer shell portion 45 is, for example, in the shape of a rectangular box. The outer shell portion 45 has a duct side opening 45a and an external side opening 45b. The duct side opening 45a is formed in an area facing the exhaust port 14a on the -Z side surface of the outer shell portion 45. The external side opening 45b is formed on the +Z side surface of the outer shell portion 45 at the end on the +X side, facing the +Z direction.

[0038] The inner wall portion 46 partitions the interior of the outer shell portion 45. The inner wall portion 46 includes walls 46a and 46b that form an acoustic damper 43 for the tubular member 41, a wall 46c that defines a flow path R3 through which gas discharged from the exhaust port 14a flows via a route separate from the tubular member 41, and a wall 46d that forms an acoustic damper 43 (rectangular tube-side damper 48) corresponding to the flow path R3. A portion of the tubular member 41 is accommodated in the space partitioned by the walls 46a, 46b, and 46f and the outer shell portion 45. The flow path R3 is partitioned by the walls 46b and 46c and the -Z side and +Y side surfaces of the outer shell portion 45. The flow path R3 is in communication with an exterior opening 45b of the outer shell portion 45. The configuration of the inner wall portion 46, for example, the arrangement of the walls 46a, 46b, 46c, and 46d, is not limited to the above, and may be other configurations.

[0039] The acoustic damper 43 has a cylindrical-side damper 47 corresponding to the flow path R2 (tubular member 41) and a rectangular tube-side damper 48 corresponding to the flow path R3. The cylindrical-side damper 47 and the rectangular tube-side damper 48 have first damper portions 47a, 48a and second damper portions 47b, 48b, respectively, which are set for different frequencies. The different frequencies can be values ​​corresponding to, for example, the primary and secondary resonance frequencies of noise from the power generation source 22.

[0040] As described above, the noise reduction devices 30, 40 of this embodiment are noise reduction devices 30, 40 that are detachably installed in a power generation facility 100 that includes an enclosure 10 having an air vent 15, either an intake port 13a or an exhaust port 14a, and a power generation unit 20 that is covered by the enclosure 10, and have first openings 31a, 41a that open in a direction different from the air vent 15 and second openings 31b, 41b that open toward the air vent 15, and are equipped with tubular members 31, 41 that form gas flow paths R1, R2 from the first openings 31a, 41a to the second openings 31b, 41b, and have acoustic liner 38 formed within the flow paths, and the tubular members 31, 41 are formed so that the flow paths R2, R3 are bent at multiple points.

[0041] Therefore, handling such as attachment and detachment to the enclosure 10 is easy, and space is saved compared to a configuration in which the tubular members 31, 41 are arranged in a straight line, while noise in the power generation equipment 100 having the power generation unit 20 covered by the enclosure 10 can be appropriately suppressed.

[0042] In the noise suppression devices 30 and 40 according to the above embodiments, the tubular members 31 and 41 have acoustic liners formed by a plurality of through holes 31c and 41a provided along the flow path. Therefore, noise can be reliably suppressed in the tubular members 31 and 41.

[0043] In the noise reduction device 30 according to the above embodiment, the enclosure 10 has the air intake 13a, the second opening 31b opens toward the air intake 13a in a direction along the surface 12a, and the tubular member 31 extends from the second opening 31b in a direction along the surface 12a. Therefore, the dimension in the direction perpendicular to the surface 12a can be reduced, and the device can be made compact.

[0044] In the noise reduction device 30 according to the above embodiment, the tubular member 31 is disposed in a position surrounding the air intake port 13a when viewed from a direction perpendicular to the surface 12a, thereby efficiently reducing the noise emitted from the air intake port 13a.

[0045] In the noise reduction device 30 according to the above embodiment, the tubular members 31 are arranged symmetrically with respect to the intake port 13a when viewed from a direction perpendicular to the surface 12a, thereby efficiently reducing the noise emitted from the intake port 13a.

[0046] In the noise reduction device 40 according to the above embodiment, the enclosure 10 has the exhaust port 14a, the second opening 41b is disposed opposite the exhaust port 14a, and the tubular member 41 extends from the second opening 41b in a direction away from the surface 12b. Therefore, the gas discharged from the exhaust port 14a can be reliably supplied to the tubular member 41, while the noise emitted from the exhaust port 14a can be reduced.

[0047] The noise reduction devices 30, 40 according to the above embodiments further include acoustic dampers 32, 43 arranged along the tubular members 31, 41. This makes it possible to efficiently reduce noise emitted from the intake port 13a and the exhaust port 14a.

[0048] In the noise reduction device 30 according to the above embodiment, the tubular member 31 has a wall portion 33 that defines the flow path R1, and the wall portion 33 has a hollow portion 31d therein, and the hollow portion 31d is connected to the flow path R1 at the end on the second opening portion 31b side to form the acoustic damper 32. Therefore, the noise emitted from the intake port 13a can be efficiently reduced.

[0049] In the noise suppression device 30A according to the above embodiment, the hollow portion 31d is formed so that the cross-sectional area of ​​the cross section changes in the direction along the flow path, thereby widening the frequency band of noise that can be reduced.

[0050] In the noise reduction device 30B according to the above embodiment, the tubular member 31 has partitions 31e that separate the flow path R1 at multiple locations along the flow path R1, and communication holes 31f that connect adjacent spaces 31s in the partitions 31e are provided to form the acoustic damper 32. Therefore, the noise emitted from the intake port 13a can be efficiently reduced.

[0051] In the noise suppression device 30C according to the above embodiment, the perforated plate 39 is arranged along the inner surface of the tubular member 31. Therefore, the noise emitted from the intake port 13a can be efficiently reduced.

[0052] 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, the configurations of the noise suppression devices 30A, 30B, and 30C described above can also be applied to the noise suppression device 40. [Explanation of symbols]

[0053] 10 Enclosure 11 Baseplate 12. Case 12a,12b side 13 Intake duct 13a Air intake 14 Exhaust duct 14a Exhaust port 15 Ventilation 20 power generating units 21 Generator 22 Power Source 30, 30A, 30B, 30C, 40 Noise suppression device 31, 31B, 34, 35, 36, 37, 41 Tubular members 31a, 34a, 35a, 36a, 37a, 41a 1st opening 31b,34b,35b,36b,37b,41b 2nd opening 31c,41a,41c through hole 31d Hollow part 31e Partition 31f communication hole 31s space part 32,43 Acoustic damper 33,33A,33B,44,46a,46b,46c,46d Wall part 38 Acoustic Liner 39 Perforated plate 42 Cover member 45 Outer wall 45a Duct side opening 45b External opening 46 Inner wall 47 Cylinder side damper 47a, 48a First damper section 47b, 48b Second damper section 48 Square tube side damper 100 Power generation facilities F Floor R1, R2, R3 flow path

Claims

1. A noise suppression device that is detachably provided to a power generation facility including an enclosure having at least one of an intake port and an exhaust port, and a power generation unit enclosed by the enclosure, a tubular member having a first opening that opens in a direction different from the vent port and a second opening that opens toward the vent port, forming a gas flow path from the first opening to the second opening, and having an acoustic liner formed within the flow path; The tubular member is formed so that the flow path is bent at a plurality of points. Noise suppression device.

2. The tubular member has a plurality of through holes formed along the flow path, forming the acoustic liner. The noise suppression device of claim 1 .

3. the enclosure has the air intake, the second opening opens toward the intake port in a direction along a surface of the enclosure, The tubular member extends from the second opening in a direction along the surface of the enclosure. The noise suppression device according to claim 1 or 2.

4. The tubular member is disposed at a position surrounding the air intake port when viewed in a direction perpendicular to the surface of the enclosure.

4. The noise suppression device of claim 3.

5. The tubular members are arranged symmetrically with respect to the intake port when viewed from a direction perpendicular to the surface of the enclosure.

5. The noise suppression device according to claim 3 or 4.

6. the enclosure has the exhaust port, the second opening is disposed opposite the exhaust port, The tubular member extends from the second opening in a direction away from the surface of the enclosure. The noise suppression device according to claim 1 or 2.

7. further comprising an acoustic damper disposed along the tubular member. The noise suppression device according to any one of claims 1 to 6.

8. The air vent is the air intake, the tubular member has a wall portion that defines the flow path, The wall portion has a hollow portion therein, and the hollow portion is connected to the flow path at an end portion on the second opening side, thereby forming the acoustic damper.

8. The noise suppression device of claim 7.

9. The hollow portion is formed so that the cross-sectional area of ​​the cross-section changes in the direction along the flow path.

9. The noise suppression device of claim 8.

10. The vent is the intake port, The tubular member has partitions that separate the flow path at a plurality of locations along the flow path, and the partitions are formed as the acoustic damper by providing communication holes that connect adjacent spaces to each other.

8. The noise suppression device of claim 7.

11. The tubular member has a perforated plate disposed along its inner surface. The noise suppression device according to any one of claims 1 to 6.

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