Silencing component

Abstract

The silencing member is provided with: a first space; a second space disposed adjacent to the first space; the channel is connected with the first space and the second space; the first part surrounds the bottom surfaces and / or the side surfaces of the first space and the second space; and a film-like second member covering the top surfaces of the first space and the second space.

Description

Technical Field

[0001] The present disclosure relates to sound attenuation components. Background Art

[0002] Conventionally, there is known a noise cancelling component that cancels out input sound by outputting a destructive wave that is a sound wave having a phase opposite to that of an input sound wave (for example, see Patent Document 1).

[0003] Patent Document 1: Japanese Patent Application Laid-Open No. 2012-47168 Summary of the invention

[0004] Technical problem to be solved by the invention

[0005] The noise reduction component of Patent Document 1 discloses a structure of a noise reduction component, which includes: a space having a pair of openings; a pair of transceiver wave membranes covering the respective openings; and a seesaw component connecting the pair of transceiver wave membranes. In the noise reduction component of Patent Document 1, when one transceiver wave membrane vibrates due to noise, the seesaw component transmits its vibration to the other transceiver wave membrane. As a result, the other transceiver wave membrane transmits a destructive wave having the same vibration frequency and opposite phase as the one transceiver wave membrane. As a result, the noise reduction component can cancel the sound wave of the noise by using the destructive wave.

[0006] On the other hand, the noise reduction component of Patent Document 1 requires a space for arranging the seesaw component that communicates with the transmitting and receiving diaphragms. Therefore, when installing the noise reduction component, it is necessary to select an installation location that can ensure sufficient space.

[0007] The technical problem of the present disclosure is to provide a noise reduction component that can be installed in a narrower space or place.

[0008] Solutions for solving technical problems

[0009] A sound-absorbing component according to one embodiment of the present disclosure comprises: a first space; a second space arranged adjacent to the first space; a channel connecting the first space and the second space; a first component surrounding the bottom surface and / or side surface of the first space and the second space; and a membrane-like second component covering the top surface of the first space and the second space.

[0010] According to the silencer component, the adjacent first space and second space are connected through a channel. Thus, the silencer component can quickly transmit the vibration input into one space to another space via the channel. To this end, the second component covering the other space can quickly generate a phase cancellation wave with a phase opposite to the input sound wave. Thus, the silencer component can silence the input noise without setting a part connected to the second component. As a result, the silencer component can be set in a narrower space or place.

[0011] Effects of the Invention

[0012] According to the present disclosure, it is possible to provide a noise reduction component that can be installed in a narrower space or location. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a perspective view showing the noise reduction member in the first embodiment of the present disclosure.

[0014] Figure 2 It is shown Figure 1 Cross-sectional view of section AA.

[0015] Figure 3 is a top view showing the noise reduction member in the first embodiment of the present disclosure.

[0016] Figure 4 This is a schematic diagram showing the mechanism of noise cancellation in the first embodiment of the present disclosure.

[0017] Figure 5 It is an exploded perspective view showing a noise reduction member in a second embodiment of the present disclosure.

[0018] Figure 6 is a top view showing a noise reduction member in a second embodiment of the present disclosure.

[0019] Figure 7 It is shown Figure 6 Cross-sectional view of the BB section. DETAILED DESCRIPTION

[0020] <First Embodiment>

[0021] Hereinafter, the first embodiment of the present disclosure will be described with reference to the drawings. In each drawing, XYZ axes orthogonal to each other for determining directions are shown.

[0022] In the present embodiment, a noise reduction component that can be attached to a roof lining of an automobile or the like will be described as an example.

[0023] like Figure 1 As shown, the silencer component 1 comprises: a first space 2; a second space 4, which is arranged adjacent to the first space 2; a channel 6, which connects the first space 2 and the second space 4; a first component 8, which surrounds the bottom surface and / or side surface of the first space 2 and the second space 4; and a second component 10, which covers the top surface of the first space 2 and the second space 4.

[0024] like Figure 2 As shown, the first space 2 is a hollow space surrounded by a top surface 21, a bottom surface 22 opposite to the top surface 21, and a side surface 23. In this embodiment, the top surface 21 and the bottom surface 22 are both circular with a radius R1 (refer to Figure 3). That is, the first space 2 is cylindrical. Not limited to this, the top surface 21 of the first space 2 is preferably circular, but it can also be other shapes. The first space 2 can also be formed into various shapes, such as a hemispherical shape.

[0025] The bottom surface 22 and the side surface 23 of the first space 2 of the present embodiment are defined by the first member 8. Furthermore, the top surface 21 of the first space 2 is defined by the second member 10.

[0026] The second space 4 is a hollow space surrounded by a top surface 41, a bottom surface 42, and a side surface 43. In this embodiment, the top surface 41 and the bottom surface 42 are both circular with a radius R1 (see Figure 3 ). That is, the second space 4 is cylindrical. Although not limited to this, the second space 4 preferably has a circular top surface 41, but may also be other shapes. The second space 4 may also be formed in various shapes, such as a hemispherical shape.

[0027] The bottom surface 42 and the side surface 43 of the second space 4 of this embodiment are defined by the first member 8 similarly to the first space 2. Furthermore, the top surface 41 of the second space 4 is defined by the second member 10 similarly to the first space 2.

[0028] The top surface 21 of the first space 2 and the top surface 41 of the second space 4 may also be formed to be equal in area. More preferably, the top surface 21 of the first space 2 and the top surface 41 of the second space 4 may be formed to be the same shape. Figure 3 As shown, the top surface 21 of the first space 2 and the top surface 41 of the second space 4 in this embodiment are both formed in a circular shape having a radius R1. However, the top surface 21 of the first space 2 and the top surface 41 of the second space 4 may also be formed in different shapes.

[0029] The first space 2 and the second space 4 may also be formed to have equal volumes. In this embodiment, the top surface 21 and the bottom surface 22 of the first space 2, the top surface 41 and the bottom surface 42 of the second space 4 are all circular with a radius of R1. Furthermore, the side surface 23 of the first space 2 and the side surface 43 of the second space 4 are arranged in the height direction ( Figure 2 Thus, the first space 2 and the second space 4 of the present embodiment are formed into cylindrical shapes with equal volumes and a radius of R1. Not limited thereto, the first space 2 and the second space 4 may also be formed into different shapes.

[0030] The radius R1 of the first space 2 and the second space 4 of this embodiment is formed in the range of about 25 mm to 100 mm. The radius R1 can also be about 10 mm to 200 mm. Furthermore, the first space 2 and the second space 4 are spaced apart in the height direction ( Figure 2The size in the direction of the arrow Z in the figure is formed in the range of about 10 mm to 30 mm. The size of the first space 2 and the second space 4 in the height direction can also be about 5 mm to 50 mm.

[0031] The first space 2 and the second space 4 are arranged adjacent to each other. Figure 2 They are arranged in parallel with a distance of about 10 mm (in the direction of the arrow X in the figure).

[0032] The channel 6 is a hollow space disposed between the first space 2 and the second space 4 and connecting the first space 2 and the second space 4. The channel 6 is surrounded by a top surface 61, a bottom surface 62 opposite to the top surface 61, a first side surface 63, and a second side surface 64 opposite to the first side surface 63. The bottom surface 62, the first side surface 63, and the second side surface 64 of the channel 6 of the present embodiment are defined by the first member 8. Furthermore, the top surface 61 of the channel 6 is defined by the second member 10.

[0033] like Figure 3 As shown, the channel 6 connects the first space 2 and the second space 4 at the shortest distance L at a position where the distance between the first space 2 and the second space 4 is the smallest.

[0034] like Figure 2 As shown, the channel 6 of this embodiment is a cube with a substantially rectangular cross section. The channel 6 is Figure 2 The size in the direction of the arrow Z in the figure is smaller than the first space 2 and the second space 4. The bottom surface 62 of the channel 6 of this embodiment is arranged above the bottom surface 22 of the first space 2 and the bottom surface 42 of the second space 4. In addition, the bottom surface 62 of the channel 6 can also be formed on the same plane as the bottom surface 22 of the first space 2 and the bottom surface 42 of the second space 4.

[0035] Channel 6 in the width direction ( Figure 3 The size in the direction of the arrow Z in the figure can be smaller than the radius R1 of the first space 2 and the second space 4, which is about 5 mm to 10 mm. Furthermore, the width of the channel 6 can also be about 2 mm to 20 mm. Not limited to this, the channel 6 can be connected to the first space 2 and the second space 4, and its shape can be changed in various ways.

[0036] The material forming the first component 8 is not particularly limited. However, from the perspective of achieving lightweight, the material forming the first component 8 is preferably a porous body. As a porous body, it can be an airtight substance, but it is preferably an air-permeable substance. For example, in the case where the first component 8 is formed by a porous body having a certain degree of air permeability, the pressure of the first space 2 and the second space 4 can be adjusted to the same level as the outside. Without limitation to this, the porous body can also be used to adjust parameters such as the humidity of the first space 2 and the second space 4 to the same level as the outside. It should be noted that a certain degree of air permeability refers to air permeability to a degree that does not affect the effect of the present invention. The first component 8 of this embodiment is formed of foamed polyurethane. Without limitation to this, the first component 8 can also be formed of various materials such as foamed polyolefins such as foamed polypropylene, fiber bodies, etc.

[0037] The first component 8 of this embodiment is formed into a substantially cubic shape. The first component 8 has a top surface 81 and a recessed portion 82 provided on the top surface 81. Figure 3 As shown, the top surface 81 of this embodiment is along the length direction ( Figure 3 The X direction of the arrow in the figure) and the depth direction ( Figure 3 The concave portion 82 of the present embodiment surrounds the first space 2, the second space 4 and a part of the channel 6.

[0038] Without limitation to this, the first component 8 only needs to surround at least a portion of the bottom surface 22 (42) and / or the side surface 23 (43) of the first space 2 and the second space 4. Thus, at least a portion of the first space 2 and the second space 4 is surrounded by the air-permeable first component 8. For this reason, the silencer component 1 can keep the air temperature, air pressure and humidity of the first space 2, the second space 4 and the passage 6 constant with the outside.

[0039] The second component 10 is formed of a non-air-permeable film component. Figure 1 and Figure 3 As indicated by the dotted lines in the figure, the second component 10 of the present embodiment is a translucent film. The second component 10 of the present embodiment is formed of TPU (Thermoplastic Polyurethane). Not limited thereto, the second component 10 may also be formed of various materials such as TPO (Thermoplastic Olefinic Elastomer) and EPDM (Ethylene Propylene Diene Methylene Linkage).

[0040] like Figure 2As shown, the second component 10 has a first portion 11, a second portion 12 and a third portion 13. The first portion 11 covers the top surface 21 of the first space 2. The second portion 12 covers the top surface 41 of the second space 4. The third portion 13 covers the top surface 61 of the channel 6.

[0041] like Figure 3 As shown, the second component 10 of this embodiment is in the length direction ( Figure 3 in the X direction) and the depth direction ( Figure 3 The size in the Y direction (in the Y direction) is formed to be substantially equal to the top surface 81 of the first component 8.

[0042] The second member 10 of this embodiment is bonded to the first member 8 by an adhesive material pre-coated on the top surface 81 of the first member 8. The second member 10 only needs to be bonded to the edge of the recess 82 at least on the top surface 81 of the first member 8. Thus, the second member 10 closes the top surface 21 of the first space 2, the top surface 41 of the second space 4, and the top surface 61 of the channel 6.

[0043] In the present embodiment, the second member 10 is a vibration membrane covering the first space 2 and the second space 4. The portion of the second member 10 covering the top surface 21 of the first space 2 and the top surface 41 of the second space 4 freely vibrates according to the flow of air inside the first space 2, the second space 4, and the passage 6. The thickness of the second member 10 is, for example, about 0.02 mm to 0.5 mm.

[0044] Next, use Figure 4 The mechanism of noise reduction by the noise reduction member 1 of the present embodiment will be described. Figure 4 1 is a schematic diagram showing a mechanism of noise elimination when sound P is input to the noise elimination component 1. Figure 4 As shown, a sound P having a predetermined frequency is input into the first space 2 via the first portion 11 of the second component 10. At this time, the first portion 11 of the second component 10 vibrates at a predetermined vibration frequency according to the frequency and amplitude of the sound P. Figure 4 , a state in which the first portion 11 of the second member 10 vibrates upon receiving the sound P and bulges toward the first space 2 is shown.

[0045] Then, the sound P input to the first space 2 is transmitted from the first space 2 to the second space 4 via the passage 6. The volumes of the first space 2 and the second space 4 are substantially equal. Therefore, when the first portion 11 of the second member 10 vibrates at a predetermined frequency corresponding to the sound P, the second portion 12 of the second member 10 is driven to vibrate at the same period as the first portion 11.

[0046] The second part 12 vibrates following the vibration of the first part 11. In the present embodiment, the top surface 21 of the first space 2 and the top surface 41 of the second space 4 are formed to be approximately equal in area. For this reason, when the first part 11 bulges toward the first space 2, the second part 12 bulges in the opposite direction toward the outside of the second space 4. That is, the first part 11 and the second part 12 vibrate at the same frequency but opposite phases to each other. Thus, the second part 12 outputs a sound P'. Here, the sound P' output by the second part 12 is opposite in phase to the sound P input to the first part 11 and has the same frequency. As a result, the silencer component 1 can cancel out the input sound P and perform silencer.

[0047] On the other hand, when the sound P is input to the second space 4 side via the second portion 12 of the second component 10, the vibration corresponding to the sound P is transmitted from the second space 4 to the first space 2 via the passage 6. As a result, the first portion 11 of the second component 10 can output the sound P'. In this case as well, the sound P' output by the first portion 11 is opposite in phase to the sound P input to the second portion 12 and has the same frequency. Therefore, when the sound P is input to either the first space 2 or the second space 4, the silencer component 1 can output the sound P' opposite in phase to the input sound P and has the same frequency as the input sound P from the other of the first space 2 and the second space 4. As a result, the silencer component 1 can silence the input sound P.

[0048] Furthermore, the muffler component 1 can muffle the sound of a specific frequency band by adjusting the area of ​​the top surface 21 of the first space 2 and the top surface 41 of the second space 4, the volume of the first space 2 and the second space 4, and the film thickness of the second component 10. The top surface 21 of the first space 2 and the top surface 41 of the second space 4 in this embodiment are formed into a circle with a radius of R1. Thus, by appropriately changing the radius R1, the muffler performance can be simply adjusted according to the frequency band to be muffled.

[0049] <Second Embodiment>

[0050] Next, use Figures 5 to 7 The second embodiment of the present disclosure is described. Figure 5 As shown, the muffler member 101 of the second embodiment includes a first space 102, a second space 104, a passage 106, a first member 108, a second member 110, and a third member 112. The first space 102, the second space 104, and the passage 106 of this embodiment are the same as those of the first embodiment, and thus description thereof is omitted.

[0051] The first member 108 includes a base 108a, a first wall 108b, a second wall 108c, and a third wall 108d. The first member 108 of this embodiment is formed of a thermoplastic resin material such as polypropylene, polyethylene, ABS resin (acrylonitrile-butadiene-styrene copolymer), PC resin (polycarbonate resin), etc.

[0052] The base 108a is along the length direction ( Figure 5 The X direction of the arrow in the figure) and the depth direction ( Figure 5 The base 108a of this embodiment is a plate-shaped member extending in the height direction (the direction of the arrow Y in FIG. Figure 5 The size in the direction of the arrow Z in the figure is formed to be approximately 5 mm to 10 mm.

[0053] The first wall portion 108b is disposed on the base portion 108a and extends in the height direction. The first wall portion 108b surrounds the first space 102 together with the base portion 108a. The first wall portion 108b of the present embodiment is formed in a thin-walled cylindrical shape with a hollow interior.

[0054] The second wall 108c is arranged on the base 108a and extends in the height direction similarly to the first wall 108b. The second wall 108c surrounds the second space 104 together with the base 108a. The second wall 108c of this embodiment is formed in the same shape as the first wall 108b.

[0055] The first wall portion 108b and the second wall portion 108c are arranged side by side on the base portion 108a.

[0056] The third wall portion 108 d is a pair of vertical walls disposed between the first wall portion 108 b and the second wall portion 108 c . The third wall portion 108 d surrounds the passage 106 .

[0057] The second member 110 is a thin film disposed between the first member 108 and the third member 112. The second member 110 of this embodiment is formed of a non-air-permeable film member and covers the first space 102, the second space 104, and the channel 106, similarly to the first embodiment.

[0058] The second member 110 of the present embodiment is sandwiched and fixed between the first member 108 and the third member 112 .

[0059] The third member 112 covers the first member 108 and the second member 110. The third member 112 of the present embodiment is formed of a thermoplastic resin material of the same quality as that of the first member 108.

[0060] The third component 112 has a fixing portion 112 a , a first opening 112 b , and a second opening 112 c .

[0061] like Figure 7 As shown, the fixing portion 112a fixes the third component 112 to the first component 108. The fixing portion 112a of this embodiment is a flange extending from the side of the third component 112. The fixing portion 112a is mounted on the side of the first component 108. Thus, the third component 112 is fixed to the first component 108. As a result, the second component 110 is fixed between the first component 108 and the third component 112, and covers the first space 102, the second space 104 and the channel 106.

[0062] The fixing portion 112a may fix the third member 112 to the first member 108 by various methods. In addition, the second member 110 may be fixed to the first member 108 or the third member 112 in advance using an adhesive material.

[0063] The first opening 112b is arranged above the first space 2 in a state where the third member 112 is fixed to the first member 108. Similarly, the second opening 112c is arranged above the second space 4.

[0064] like Figure 6 As shown, the first opening 112b and the second opening 112c of the present embodiment are louvers. Thus, the first opening 112b and the second opening 112c can protect the first component 108 and the second component 110 without hindering the transmission of sound input and output relative to the muffler component 101. Not limited to this, the first opening 112b and the second opening 112c can also be formed into a honeycomb shape or a lattice structure of other geometric shapes.

[0065] As described above, according to the present disclosure, it is possible to provide a noise reduction component having a simple structure that can be installed in a narrower place or space.

[0066] <Other Implementation Methods>

[0067] As mentioned above, although embodiment of this disclosure was described, this disclosure is not limited to the said embodiment, Various changes can be made within the range which does not deviate from the meaning of invention.

[0068] For example, the first space 2, 102 and the second space 4, 104 of the muffler component 1, 101 in the above-mentioned embodiment are formed into a cylindrical shape with a radius R1, but the present disclosure is not limited thereto. That is, the shape of the top surface of the first space 2, 102 and the second space 4, 104 is not limited to a circle, and may also be different shapes. In the muffler component 1, 101, as long as the volume of the first space 2, 102 and the second space 4, 104 are equal, the shape and film thickness of the second component 10, 110 covering them are the same.

[0069] Furthermore, the first member 8, 108 of the muffler member 1, 101 in the above-mentioned embodiment surrounds the bottom and side surfaces of the first space 2, 102 and the second space 4, 104, but the present disclosure is not limited thereto. That is, the first member 8, 108 may also have a through hole in the shape of the first space 2, 102, the second space 4, 104, and the passage 6, 106. In this case, one end of the through hole may be covered by the second member 10, 110, and the other end may be covered by a part of the headliner where the muffler member 1, 101 is provided.

[0070] In addition, the muffler components 1 and 101 in the above-mentioned embodiments are provided on the roof lining of the automobile, but the present disclosure is not limited thereto. That is, the muffler components 1 and 101 may also be provided on the dashboard of the automobile or various body parts. In this case, in the muffler components 1 and 101, it is sufficient that the second component 10 and 110 is arranged opposite to the sound source.

[0071] Furthermore, although the noise reduction members 1 and 101 in the above-mentioned embodiments are disposed in the automobile, the present disclosure is not limited thereto. That is, the noise reduction members 1 and 101 may be installed in the walls of a house or a building.

[0072] In addition, in the above-mentioned embodiment, the first space 2, 102, the second space 4, 104 and the channel 6, 106 are each provided, but the present disclosure is not limited thereto. That is, in the sound-absorbing component 1, 101, a plurality of the first space 2, 102 and the second space 4, 104 connected by the channel 6, 106 may be provided. In this case, the first component 8, 108 may also be formed in accordance with the size of the installation location, the curvature of the surface, etc.

[0073] Furthermore, the first member 8, 108 in the above embodiment is formed of a porous body having a certain degree of air permeability, but the present disclosure is not limited thereto. That is, the material forming the first member 8, 108 may also be non-air permeable. In this case, in order to adjust the parameters such as the pressure and humidity of the first space 2, 102 and the second space 4, 104 to the same level as the outside, an adjustment valve or the like may also be provided.

[0074] Description of Reference Numerals

[0075] 1. 101: sound-absorbing component; 2. 102: first space; 4. 104: second space; 6. 106: passage; 8. 108: first component; 10. 110: second component; 112: third component.

Claims

1. A sound-absorbing component, comprising: First Space; a second space, arranged adjacent to the first space; a passage connecting the first space and the second space; a first component surrounding a bottom surface and / or a side surface of the first space and the second space; and The second film-shaped member covers the top surfaces of the first space and the second space.

2. The sound-absorbing component according to claim 1, wherein: The top surfaces of the first space and the second space are formed to be equal in area.

3. The sound-absorbing component according to claim 1, wherein: The first space and the second space are formed to have the same volume.

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