Sound absorbing device

Abstract

The invention provides a sound absorbing device capable of effectively absorbing noise in an indoor space. A sound absorbing device includes: a resonance tube, both ends of which are provided so as to face an indoor space; one surface of the vibration plate is arranged on one end part of the resonance pipe and faces the indoor space, and the other surface, opposite to the indoor space, of the vibration plate is arranged to face the inner space of a pipeline of the resonance pipe; the resonance tubes include a first resonance tube and a second resonance tube shorter than the first resonance tube, and the resonance frequency of the vibration plate is set to be between the resonance frequency of the first resonance tube and the resonance frequency of the second resonance tube.

Description

Technical Field

[0001] The invention relates to a sound absorbing device. Background Art

[0002] In recent years, in order to ensure that more people have access to affordable, reliable, sustainable and advanced energy, research and development on lightweighting that contributes to energy efficiency has been carried out. However, in this technology on lightweighting, how to make various devices used in vehicles lighter while improving their functions is an important issue.

[0003] For example, when a vehicle is running, the rotational vibration of the engine, the running vibration, etc. will form low-frequency noise and be transmitted to the interior of the vehicle. As a countermeasure against this noise, various resonator-type sound absorbing devices using resonance tubes and resonance boxes, or plate vibration-type sound absorbing devices using thin plates or films have been designed.

[0004] For example, Patent Document 1 describes a side branch type sound absorbing device using a resonance tube with adjustable length. However, in order to reduce the target indoor sound in the low frequency range, it is necessary to increase the channel length of the resonance tube. Therefore, in the sound absorbing device described in Patent Document 1, there is a tendency that the entire sound absorbing device becomes large and heavy.

[0005] On the other hand, in a plate vibration type sound absorbing device using a thin plate or film, in order to make the vibration plate (membrane) sufficiently vibrate when receiving the sound pressure of noise in the indoor space, it is necessary to increase the area of ​​the vibration plate (membrane). Therefore, in this type of sound absorbing device, the installation area of ​​the vibration plate (membrane) becomes large, resulting in the entire sound absorbing device becoming large and heavy.

[0006] Therefore, an object of the present invention is to provide a sound absorbing device for a mobile body, which can effectively absorb noise in an indoor space without increasing the size and weight of the device, thereby improving the quietness and energy efficiency of the mobile body, achieving the purpose of lightweighting, and further contributing to energy efficiency.

[0007] [Prior art literature]

[0008] [Patent Document]

[0009] [Patent Document 1] Japanese Patent Application Laid-Open No. 2009-102000 Summary of the invention

[0010] The invention provides a sound absorbing device which can effectively absorb the noise in the indoor space.

[0011] The present invention provides a sound absorbing device. The sound absorbing device comprises: a resonance tube, both ends of which are arranged to face an indoor space; and a vibration plate, one surface of which is arranged on one end of the resonance tube and faces the indoor space, and the other surface of the vibration plate which faces away from the indoor space is arranged to face the inner space of the pipe of the resonance tube, the resonance tube comprises a first resonance tube and a second resonance tube shorter than the first resonance tube, and the resonance frequency of the vibration plate is set to be between the resonance frequency of the first resonance tube and the resonance frequency of the second resonance tube.

[0012] In one embodiment of the present invention, the resonance frequency of the vibration plate is set to an intermediate value between the resonance frequency of the first resonance tube and the resonance frequency of the second resonance tube.

[0013] In one embodiment of the present invention, the vibration plate includes a first vibration plate and a second vibration plate, the first vibration plate is arranged corresponding to one end of the first resonance tube, the second vibration plate is arranged corresponding to one end of the second resonance tube, and the first vibration plate and the second vibration plate have the same thickness.

[0014] In one embodiment of the present invention, the first vibration plate and the second vibration plate are integrally formed.

[0015] In one embodiment of the present invention, the sound absorbing device further includes: a liner, which is arranged in the indoor space, the liner has an outer surface exposed to the indoor space, the first resonance tube and the second resonance tube are installed on the liner, and the first resonance tube overlaps with the second resonance tube on a side away from the outer surface of the liner.

[0016] In one embodiment of the present invention, the lining has a first direction and a second direction, and the projection length of the lining in the first direction is greater than the projection length in the second direction, wherein the first resonance tube and the second resonance tube are arranged along the second direction, and any end of the first resonance tube and any end of the second resonance tube are aligned in the second direction, and both ends of the first resonance tube and both ends of the second resonance tube are arranged along the first direction respectively, and both ends of the first resonance tube are aligned on a first reference line parallel to the first direction, and both ends of the second resonance tube are aligned on a second reference line parallel to the first direction.

[0017] In one embodiment of the present invention, a plurality of the first resonance tubes and a plurality of the second resonance tubes are provided, the plurality of the first resonance tubes are arranged along a first direction and aligned on the first reference line, and the plurality of the second resonance tubes are arranged along the first direction and aligned on the second reference line.

[0018] Based on the above, in the sound absorbing device of the embodiment of the present invention, the noise in the indoor space can be effectively absorbed by the interference effect of the resonance tube on the noise within the predetermined frequency range and the resonance effect of the vibration plate whose amplitude is amplified. In addition, although the first resonance tube and the second resonance tube of the resonance tube can only absorb the sound within a relatively narrow frequency band, by using the vibration plate whose resonance frequency is set between the resonance frequency of the first resonance tube and the resonance frequency of the second resonance tube, the sound in the frequency band region between the resonance frequency of the first resonance tube and the resonance frequency of the second resonance tube can be absorbed, and the sound absorbing device can absorb the sound within a relatively wide frequency band. Therefore, the sound absorbing device of the present invention can effectively absorb the noise in the indoor space without increasing the size and weight of the device, thereby improving the quietness and energy efficiency of the mobile body, achieving the purpose of lightweighting, and further contributing to energy efficiency.

[0019] In order to make the above features and advantages of the present invention more clearly understood, embodiments are given below with reference to the accompanying drawings for detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1A and Figure 1B They are respectively a front view schematic diagram and a rear view schematic diagram of a sound absorbing device according to an embodiment of the present invention;

[0021] FIG. 2A to FIG. 2C They are Figure 1A and Figure 1B The sound absorbing device shown is a front view schematic diagram, a rear view schematic diagram and a side view schematic diagram after the partition is removed;

[0022] Figure 3A yes Figure 2A An enlarged schematic diagram of a local area of ​​the sound absorbing device shown;

[0023] Figure 3B yes Figure 3A A schematic diagram of a local area of ​​the sound absorbing device after removing the first vibration plate and the second vibration plate;

[0024] Figure 4 yes Figure 2A A schematic cross-sectional view of the sound absorbing device shown along a first reference line or a second reference line;

[0025] Figure 5 yes Figure 2A A schematic diagram of a curve showing the relationship between the sound absorption rate and the resonance frequency of the first resonance tube, the second resonance tube and the vibration plate of the sound absorbing device shown;

[0026] Figure 6 is a schematic diagram of a vibration plate of a sound absorbing device according to another embodiment of the present invention.

[0027] Description of reference numerals:

[0028] 100, 600: Sound-absorbing device

[0029] 110: Resonance Tube

[0030] 111: First resonance tube

[0031] 112: Second resonance tube

[0032] 120, 620: Vibration plate

[0033] 121, 621: First vibration plate

[0034] 122, 621: Second vibration plate

[0035] 130: Lining

[0036] 140: Partition

[0037] 111E, 111E1, 111E2, 112E, 112E1, 112E2, E1, E2: End

[0038] 111P, 112P, P: Pipeline

[0039] D1: First direction

[0040] D2: Second direction

[0041] L1: First baseline

[0042] L2: Second baseline

[0043] OP: Opening

[0044] S1, S2: Surface

[0045] S130: External surface. DETAILED DESCRIPTION

[0046] Figure 1A and Figure 1B They are respectively a front view schematic diagram and a rear view schematic diagram of a sound absorbing device according to an embodiment of the present invention; FIG. 2A to FIG. 2C They are Figure 1A and Figure 1B The sound absorbing device shown is a front view schematic diagram, a rear view schematic diagram and a side view schematic diagram after the partition is removed; Figure 3A yes Figure 2A An enlarged schematic diagram of a local area of ​​the sound absorbing device shown; Figure 3B yes Figure 3A A schematic diagram of a local area of ​​the sound absorbing device after removing the first vibration plate and the second vibration plate; Figure 4 yes Figure 2A A schematic cross-sectional view of the sound absorbing device shown along a first reference line or a second reference line; Figure 5 yes Figure 2A The figure is a schematic diagram of a curve showing the relationship between the sound absorption rate and the resonance frequency of the first resonance tube, the second resonance tube and the vibration plate of the sound absorbing device.

[0047] Please refer to Figures 1A to 5 In this embodiment, the sound absorbing device 100 includes a resonance tube 110, a vibration plate 120, an inner lining 130, and a partition 140. Specifically, in this embodiment, the inner lining 130 is disposed in the indoor space and has an outer surface S130 exposed to the indoor space. Figures 1A to 2C As shown, in this embodiment, the two ends E1 and E2 of the resonance tube 110 are arranged to face the indoor space, and the resonance tube 110 includes a first resonance tube 111 and a second resonance tube 112 whose pipeline is shorter than the first resonance tube 111, wherein the first resonance tube 111 and the second resonance tube 112 are installed on the lining 130. In this embodiment, the resonance frequency of the first resonance tube 111 and the resonance frequency of the second resonance tube 112 can be determined respectively by appropriately adjusting the length of the pipeline 111P of the first resonance tube 111 and the length of the pipeline 112P of the second resonance tube 112. And, as Figure 1B , Figure 2B and Figure 2C As shown, the first resonance tube 111 overlaps the second resonance tube 112 at a side away from the outer surface S130 of the liner 130. In this way, by stacking the first resonance tube 111 with a longer pipeline on the second resonance tube 112, the thickness of the entire liner 130 can be reduced.

[0048] Furthermore, if Figure 3A and Figure 3B As shown, in this embodiment, the liner 130 has a first direction D1 and a second direction D2, and the projection length of the liner 130 in the first direction D1 is greater than the projection length in the second direction D2, wherein the first resonance tube 111 and the second resonance tube 112 are arranged along the second direction D2, and any end 111E of the first resonance tube 111 and any end 112E of the second resonance tube 112 are aligned in the second direction D2. On the other hand, in this embodiment, both ends 111E of the first resonance tube 111 and both ends 112E of the second resonance tube 112 are arranged along the first direction D1, respectively, and both ends 111E of the first resonance tube 111 are aligned on a first reference line L1 parallel to the first direction D1, and both ends 112E of the second resonance tube 112 are aligned on a second reference line L2 parallel to the first direction D1. Furthermore, in this embodiment, a plurality of first resonance tubes 111 and a plurality of second resonance tubes 112 may be provided, wherein the plurality of first resonance tubes 111 are arranged along the first direction D1 and aligned on the first reference line L1, and the plurality of second resonance tubes 112 are arranged along the first direction D1 and aligned on the second reference line L2.

[0049] In this way, by aligning the end 111E of the first resonance tube 111 and the end 112E of the second resonance tube 112 on the first reference line L1 and the second reference line L2, respectively, and aligning any end 111E of the first resonance tube 111 and any end 112E of the second resonance tube 112 in the second direction D2, the end 111E of the first resonance tube 111 and the end 112E of the second resonance tube 112 can be arranged in order, and the pipe 111P of the first resonance tube 111 is stacked on the pipe 112P of the second resonance tube 112 with a shorter length without interfering with each other. In this way, the length of the pipe 111P of the first resonance tube 111 can be ensured. In addition, by stacking the first resonance tube 111 and the second resonance tube 112, a plurality of first resonance tubes 111 and second resonance tubes 112 can be arranged along the first direction D1 without increasing the area of ​​the outer surface S130 of the liner 130. In this way, the number of the first resonance tubes 111 and the second resonance tubes 112 can be increased sufficiently, and the sound absorption and reduction effect can be further improved.

[0050] On the other hand, Figure 2A , Figure 3A and Figure 4 As shown, in this embodiment, one surface S1 of the vibration plate 120 is disposed on one end E1 of the resonance tube 110 and faces the indoor space, and the other surface S2 of the vibration plate 120 facing away from the indoor space is disposed to face the inner space of the pipe P of the resonance tube 110, that is, the other surface S2 is located on the opposite side of the surface S1 facing the indoor space, and faces the inner space of the pipe P of the resonance tube 110. The other end E2 of the pipe P of the resonance tube 110 is not provided with the vibration plate 120, but forms an opening. Here, one end E1 of the resonance tube 110 may be either the end 111E1 of the first resonance tube 111 or the end 112E1 of the second resonance tube 112, and the other end E2 of the resonance tube 110 may be either the end 111E2 of the first resonance tube 111 or the end 112E2 of the second resonance tube 112. Furthermore, in the present embodiment, although the end 111E1 of the first resonance tube 111 and the end 112E1 of the second resonance tube 112, and the end 111E2 of the first resonance tube 111 and the end 112E2 of the second resonance tube 112 are aligned in the second direction D2 as an example, the present invention is not limited to this. In another embodiment not shown, the end 111E1 of the first resonance tube 111 may also be aligned with the end 112E2 of the second resonance tube 112 in the second direction D2, and the end 111E2 of the first resonance tube 111 may also be aligned with the end 112E1 of the second resonance tube 112 in the second direction D2.

[0051] In addition, if Figure 1AAs shown, in this embodiment, the partition 140 is disposed on the outer surface S130 of the liner 130 corresponding to the ends E1 and E2 of the resonance tube 110, wherein the partition 140 has a plurality of openings OP to expose the other end E2 of the vibration plate 120 and the resonance tube 110 formed as an opening. Figure 4 As shown, the noise in the indoor space can be transmitted to the vibration plate 120 through the opening OP of the partition 140 and enter the internal space of the pipe P of the resonance tube 110 through the opening OP of the partition 140 and the other end E2 of the resonance tube 110, and be transmitted to the other surface S2 of the vibration plate 120 facing away from the indoor space.

[0052] Here, the pressure difference caused by the pressure vibration from the indoor space directly received by one surface S1 of the vibration plate 120 and the opposite pressure vibration received by the other surface S2 of the vibration plate 120 through the resonance tube 110 can amplify the amplitude of the vibration plate 120, causing the vibration plate 120 to vibrate violently and absorb a large amount of sound energy, thereby achieving the effect of sound absorption and noise reduction.

[0053] Specifically, if Figure 5 As shown in FIG. 1 , in this embodiment, the resonance frequency of the vibration plate 120 is set between the resonance frequency of the first resonance tube 111 and the resonance frequency of the second resonance tube 112. Figure 5 As shown, although the first resonance tube 111 or the second resonance tube 112 has a high sound absorption rate only for sounds in the frequency band near its resonance frequency, and can only absorb noise in the frequency band area near its resonance frequency, by using the vibration plate 120 whose resonance frequency is set between the resonance frequency of the first resonance tube 111 and the resonance frequency of the second resonance tube 112, it is possible to absorb sounds in the frequency band area between the resonance frequency of the first resonance tube 111 and the resonance frequency of the second resonance tube 112. In this way, the frequency range of noise that can be absorbed by the sound absorbing device 100 can be effectively expanded.

[0054] Furthermore, if Figure 5 As shown, in this embodiment, the resonance frequency of the vibration plate 120 can be set to an intermediate value between the resonance frequency of the first resonance tube 111 and the resonance frequency of the second resonance tube 112. In this way, by setting the resonance frequency of the vibration plate 120 to an intermediate value, the sound absorption characteristics of the entire frequency band between the resonance frequency of the first resonance tube 111 and the resonance frequency of the second resonance tube 112 can be improved, and the effect of sound absorption and noise reduction can be further improved.

[0055] In addition, if Figure 2A and Figure 3AAs shown, in this embodiment, the vibration plate 120 may include a first vibration plate 121 and a second vibration plate 122, the first vibration plate 121 is arranged corresponding to one end 111E1 of the first resonance tube 111, and the second vibration plate 122 is arranged corresponding to one end 111E2 of the second resonance tube 112. For example, in this embodiment, the first vibration plate 121 and the second vibration plate 122 have the same thickness. In this way, the resonance frequencies of the first vibration plate 121 arranged in the first resonance tube 111 and the second vibration plate 122 arranged in the second resonance tube 112 can be made the same or similar, thereby enhancing the sound absorption effect of the vibration plate 120.

[0056] In this way, the sound absorbing device 100 can effectively absorb the noise in the indoor space through the interference effect of the resonance tube 110 on the noise within the predetermined frequency range and the resonance effect of the vibration plate 120 with amplified amplitude, and can effectively absorb the noise in the indoor space without increasing the size and weight of the equipment, thereby improving the quietness and energy efficiency of the mobile body, achieving the purpose of lightweighting, and further contributing to energy efficiency.

[0057] In addition, in this embodiment, although the first vibration plate 121 and the second vibration plate 122 are illustrated as separate plates, the present invention is not limited thereto. In other embodiments, the first vibration plate 121 and the second vibration plate 122 may also be an integrally formed structure. Figure 6 Provide further explanation.

[0058] Figure 6 is a schematic diagram of a vibration plate of a sound absorbing device according to another embodiment of the present invention. Figure 6 The sound absorbing device 600 and the vibration plate 620 of this embodiment are Figure 2A The sound absorbing device 100 is similar to the vibration plate 120, but the differences between the two are as follows. Figure 6 As shown, in this embodiment, the first vibration plate 621 and the second vibration plate 622 of the vibration plate 620 are integrally formed. In this way, the number of parts of the sound absorbing device 100 can be reduced.

[0059] Furthermore, in the present embodiment, the sound absorbing device 600 can also absorb the sound between the resonance frequency of the first resonance tube 111 and the resonance frequency band of the second resonance tube 112 by disposing the first resonance tube 111 and the second resonance tube 112 of the resonance tube 110 and the first vibration plate 621 and the second vibration plate 622 of the integrally formed vibration plate 620, so that the frequency range of the noise that can be absorbed by the sound absorbing device 100 can be effectively expanded, thereby enabling the sound absorbing device 600 to have the advantages mentioned above for the sound absorbing device 100, which will not be repeated here.

[0060] In summary, in the sound absorbing device of the embodiment of the present invention, the noise in the indoor space can be effectively absorbed by the interference effect of the resonance tube on the noise within the predetermined frequency range and the resonance effect of the vibration plate whose amplitude is amplified. In addition, although the first resonance tube and the second resonance tube of the resonance tube can only absorb the sound within a relatively narrow frequency band, by using the vibration plate whose resonance frequency is set between the resonance frequency of the first resonance tube and the resonance frequency of the second resonance tube, the sound in the frequency band region between the resonance frequency of the first resonance tube and the resonance frequency of the second resonance tube can be absorbed, and the sound absorbing device can absorb the sound within a relatively wide frequency band. Therefore, the sound absorbing device of the present invention can effectively absorb the noise in the indoor space without increasing the size and weight of the device, thereby improving the quietness and energy efficiency of the mobile body, achieving the purpose of lightweighting, and further contributing to energy efficiency.

[0061] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A sound absorbing device, characterized in that: include: A resonance pipe, wherein both ends of the resonance pipe are arranged to face the indoor space; as well as a vibration plate, wherein one surface of the vibration plate is arranged on one end of the resonance tube and faces the indoor space, and the other surface of the vibration plate facing away from the indoor space is arranged to face the inner space of the pipe of the resonance tube, The resonance tube includes a first resonance tube and a second resonance tube shorter than the first resonance tube. The resonance frequency of the vibration plate is set between the resonance frequency of the first resonance tube and the resonance frequency of the second resonance tube.

2. The sound absorbing device according to claim 1, characterized in that: The resonance frequency of the vibration plate is set to an intermediate value between the resonance frequency of the first resonance tube and the resonance frequency of the second resonance tube.

3. The sound absorbing device according to claim 1, characterized in that: The vibration plate includes a first vibration plate and a second vibration plate, the first vibration plate is arranged corresponding to one end of the first resonance tube, the second vibration plate is arranged corresponding to one end of the second resonance tube, and the first vibration plate and the second vibration plate have the same thickness.

4. The sound absorbing device according to claim 3, characterized in that: The first vibration plate and the second vibration plate are integrally formed.

5. The sound absorbing device according to claim 1, characterized in that: Also includes: A liner is arranged in the indoor space, the liner has an outer surface exposed to the indoor space, the first resonance pipe and the second resonance pipe are installed on the liner, and the first resonance pipe overlaps with the second resonance pipe on a side away from the outer surface of the liner.

6. The sound absorbing device according to claim 5, characterized in that: The lining has a first direction and a second direction, and the projection length of the lining in the first direction is greater than the projection length in the second direction, wherein The first resonance tube and the second resonance tube are arranged along a second direction, and any end of the first resonance tube and any end of the second resonance tube are aligned in the second direction, and Both ends of the first resonance tube and both ends of the second resonance tube are arranged along a first direction respectively, and both ends of the first resonance tube are aligned on a first reference line parallel to the first direction, and both ends of the second resonance tube are aligned on a second reference line parallel to the first direction.

7. The sound absorbing device according to claim 6, characterized in that: The first resonance tube and the second resonance tube are both provided in plurality. The plurality of first resonance tubes are arranged along a first direction and aligned on the first reference line. The plurality of second resonance tubes are arranged along the first direction and aligned on the second reference line.

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