JP6512355B1 - Sound absorbing member, building panel and sound absorbing case - Google Patents

Abstract

An object is to provide a sound absorbing member which is excellent in sound absorption and heat dissipation. A sound absorbing member (1) comprises a substrate (10) having a first surface (10a) and a second surface (10b) opposite to the first surface (10a), and a first surface (10a) and a second surface of the substrate (10). And at least one sound absorbing portion 30 provided on an outer peripheral side of the ventilation portion 20 and in communication with the ventilation portion 20. [Selected figure] Figure 1

Description

  The present invention relates to a sound absorbing member, an architectural panel provided with the same, and a sound absorbing case.

  Conventionally, in order to reduce noise generated by devices such as a generator, an electric motor, and a compressor, the periphery of these devices is covered with a sound absorbing member. As a sound absorbing member for reducing noise, for example, a sound insulating panel including a hollow plate-shaped resin base material in which a plurality of pillar-shaped cells are provided in a planar shape and a sheet body is known (see Patent Document 1). .

JP 2017-151325 A

  Since the above-mentioned sound insulation panel does not take heat dissipation into consideration, when the above-mentioned sound insulation panels are combined to cover the periphery of the device, the heat generated by the device is easily accumulated inside. If the heat of the device is absorbed internally, the device is likely to break down and the fuel consumption also deteriorates. On the other hand, if a vent hole is provided in the above-mentioned sound insulation panel in order to obtain heat dissipation, since noise leaks to the outside without being reduced, sound absorption declines.

  An object of the present invention is to provide a sound-absorbing member, a building panel and a sound-absorbing case excellent in sound absorption and heat radiation.

The present invention solves the above problems by the following solution means. In addition, in order to make an understanding easy, although the code | symbol corresponding to embodiment of this invention is attached | subjected and demonstrated, it is not limited to this.
According to a first aspect of the present invention, there is provided a substrate (10) having a first surface (10a) and a second surface (10b) opposite to the first surface, and the first surface of the substrate Sound absorption comprising at least one ventilation portion (20) penetrating between the second surface and the at least one sound absorbing portion (30) provided on the outer peripheral side of the ventilation portion and in communication with the ventilation portion It relates to a member (1).
A second invention is the sound absorbing member (1) according to the first invention, wherein the sound absorbing portion is a Helmholtz resonator provided in a direction orthogonal to a penetrating direction of the vent.
According to a third invention, in the sound absorbing member (1) of the first or second invention, a plurality of the sound absorbing parts are provided along the penetrating direction of the vent.
According to a fourth invention, in the sound absorbing member (1) of any of the first to third inventions, a plurality of the sound absorbing portions are provided along the outer surface of the ventilation portion.
The fifth invention relates to a building panel (2) including the sound absorbing member (1) according to any of the first to fourth inventions, and a panel material (40) on which the sound absorbing member is installed.
The sixth invention relates to a sound absorbing case (3) including the sound absorbing member (1) according to any of the first to fourth inventions, and configured to surround the device serving as a sound source.

  According to the present invention, it is possible to provide a sound absorbing member, a building panel and a sound absorbing case which are excellent in sound absorption and heat dissipation.

It is a perspective view of sound absorption member 1 in a 1st embodiment. FIG. 2 is a block diagram of a sound absorbing unit 30. FIG. 6 is a cross-sectional view of the sound absorbing structure 40. It is a disassembled perspective view which shows the structure of the building panel 2 of 2nd Embodiment. It is a perspective view which shows the structure of the sound absorption housing | casing 3 of 3rd Embodiment. It is a perspective view which shows the structure of 1 A of sound absorbing members in a 1st modification. It is a perspective view which shows the structure of the sound absorption member 1B in a 2nd modification. It is a disassembled perspective view which shows the structure of 1 C of sound absorbing members in a 3rd modification. It is sectional drawing of 1 C of sound absorbing members in a 3rd modification.

Hereinafter, embodiments of the present invention will be described. In the drawings attached to the present specification, the shapes, scales, vertical and horizontal dimensional ratios, etc. of the respective parts are changed or exaggerated from the actual one in consideration of easy understanding and the like.
In the present specification, the terms such as “shape”, “geometrical condition”, and the like that specify these degrees, such as “parallel”, “orthogonal”, “direction” and the like, in addition to the exact meaning of the terms, are similar It has an optical function and includes a range in which it can be regarded as substantially parallel, almost orthogonal, etc., and a range which can be regarded as almost in the direction.

First Embodiment
FIG. 1 is a perspective view of the sound absorbing member 1 in the first embodiment. FIG. 2 is a block diagram of the sound absorbing unit 30. As shown in FIG. FIG. 2A is a cross-sectional view of the sound absorbing unit 30. FIG. FIG. 2B is a plan view of the sound absorbing unit 30. FIG. Among these, FIG. 2A is a cross-sectional view in a plane parallel to the XZ plane, which passes through center lines (described later) of the ventilation portion 20 and the sound absorption portion 30.

In each figure (except FIG. 5), an XYZ orthogonal coordinate system is shown. In this coordinate system, the thickness direction of the sound absorbing member 1 is taken as the Z direction, and two directions orthogonal to the Z direction are taken as the X direction and the Y direction, respectively. Since the X direction and the Y direction are for convenience, they may be interchanged. In the Z direction, the upper direction in the drawing is the + Z direction, and the lower direction is the -Z direction. The vertical direction of the sound absorbing member 1 is not limited to the vertical direction. In the X direction, the right direction in the drawing is the + X direction, and the left direction is the −X direction. In the Y direction, the front direction in the drawing is the + Y direction, and the back direction is the -Y direction. In the present specification, "direction" is also referred to as "side" as appropriate.
Moreover, although this embodiment demonstrates the example installed so that the left-right direction (X direction) of the sound absorption member 1 may correspond with the horizontal direction in a figure, the sound absorption member 1 is not restricted to this, What kind of direction It may be installed in For example, the sound absorbing member 1 may be installed in a state in which the left and right direction and the front and back direction are inclined from horizontal.

As shown in FIG. 1, the sound absorbing member 1 according to the first embodiment includes a base 10, a ventilation unit 20, and a sound absorbing unit 30.
The base material 10 is a member which becomes a base of the sound absorption member 1, and is formed in a box frame shape. The base material 10 has the 1st surface 10a located in the + Z side, and the 2nd surface 10b located in the -Z side, as shown in FIG. In the present embodiment, examples of the material for forming the substrate 10 include, but not limited to, a material with good sound absorption properties such as expanded polystyrene and urethane foam.

  The ventilation part 20 is a member which penetrates between the first surface 10 a and the second surface 10 b of the base material 10 in the Z direction. The ventilation part 20 is formed in a cylindrical shape. As shown in FIG. 2A, the end on the + Z side of the ventilation portion 20 is open to the first surface 10 a of the base material 10. Further, the end on the −Z side of the ventilation portion 20 is open to the second surface 10 b of the base material 10. As shown in FIG. 1, a plurality of ventilation parts 20 are disposed inside the base material 10. By arranging the ventilation part 20 inside the substrate 10, in the space partitioned by the substrate 10, it becomes possible to circulate air from the first surface 10a side to the second surface 10b side, and The air can flow from the side of the second surface 10b to the first surface 10a.

  As shown in FIG. 1, the ventilation part 20 is arrange | positioned at grid shape, when the base material 10 is seen from the thickness direction (Z direction). In addition, although it is desirable to set it as a regular arrangement pattern as shown in FIG. 1 in order to obtain uniform sound absorption and heat dissipation, the arrangement pattern of the ventilation part 20 can be suitably set not only in this. The density at which the ventilation portion 20 is disposed in one sound absorbing member 1 may be appropriately set in accordance with the usage of the sound absorbing member 1. As a material which comprises the ventilation | gas_flowing part 20, resin materials, such as a plastics, and metal materials, such as aluminum, are mentioned, for example.

  The sound absorbing unit 30 is a Helmholtz resonator provided on the outer peripheral side of the ventilation unit 20. The Helmholtz resonator is a structure that absorbs air vibrations in resonance with the frequency of air that is transmitted, as described later. The sound absorbing unit 30 is formed in a cylindrical shape, and as shown in FIG. 2A, one end communicates with the ventilation unit 20 and the other end is sealed. The sound absorbing unit 30 may be manufactured integrally with the ventilation unit 20 or may be joined as a separate part. Further, the sound absorbing unit 30 and the venting unit 20 may be made of the same material, or may be made of another material. In the following description, a structure in which the sound absorbing unit 30 is provided in the ventilation unit 20 is also referred to as a "sound absorbing structure 40".

  The sound absorbing unit 30 is provided along the penetration direction (Z direction) of the ventilation unit 20. In the present embodiment, as shown in FIG. 2A, two sound absorbing portions 30 are arranged at equal intervals on the outer peripheral side of the right side (+ X side) of the venting portion 20, and the left side (−X side of the venting portion 20) Similarly two pieces are arranged at equal intervals on the outer peripheral side of. In the present embodiment, an example in which the sound absorbing unit 30 is arranged in the X (−X, + X) direction will be described, but the sound absorbing unit 30 may be arranged in any direction on the outer peripheral side of the ventilation unit 20. For example, the sound absorbing unit 30 may be disposed in the Y (−Y, + Y) direction. Further, the number of the sound absorbing units 30 is not limited to two in each direction, and may be one or three or more. Moreover, the number may differ in the direction to arrange | position.

  As shown in FIG. 2A, the sound absorbing unit 30 is provided such that the center line c1 is orthogonal to the center line c2 in the penetrating direction (Z direction) of the ventilation unit 20. In the present embodiment, the sound absorbing units 30 are disposed such that the center lines c1 of the sound absorbing units 30 facing each other coincide with each other in the left-right direction (X direction) of the ventilation unit 20. Further, as shown in FIG. 2B, the sound absorbing unit 30 is arranged such that the two center lines c1 are located on the same straight line in plan view when the venting unit 20 is viewed from the penetration direction (Z direction). It is located 180 degrees apart.

Next, the operation of the Helmholtz resonator constituting the sound absorbing unit 30 will be briefly described.
FIG. 3 is a cross-sectional view of the sound absorbing structure 40. Note that FIG. 3 conceptually shows how air is compressed and expanded.
As shown in FIG. 3, the air a1 vibrating by the energy of the sound (wave) generated by the sound source (not shown) is transmitted to the sound absorbing unit 30 to compress the air a2 of the sound absorbing unit 30. The compressed air a2 of the sound absorbing unit 30 is expanded by the restoring force that tends to return to the original volume, so the air a1 is pushed out of the sound absorbing unit 30. When the air a2 of the sound absorbing unit 30 expands due to the restoring force, a negative pressure is generated inside the sound absorbing unit 30, so the air a2 of the sound absorbing unit 30 is compressed again by the air a1. When the frequency of the sound transmitted to the sound absorbing unit 30 matches the resonance frequency of the sound absorbing unit 30, the above-described compression and expansion of the air a1 and a2 are repeated as a vibration phenomenon. Therefore, the energy of the air a1 that repeatedly reciprocates inside and outside the sound absorbing unit 30 is attenuated due to the frictional resistance generated between the sound absorbing unit 30 and the air a1. As described above, the sound absorbing unit 30 has the function of attenuating the vibrating air a1 having the energy of the sound generated by the sound source.

  As shown in FIG. 3, the resonance frequency in the sound absorbing unit 30 is the length l of the sound absorbing unit 30, the diameter r1 of the sound absorbing unit 30 (cylindrical), the diameter r2 of the vent 20 (cylindrical), and the penetration of the vent 20 Parameters such as the length L in the direction (Z direction) and the number of sound absorbing units 30 provided in one ventilation unit 20 are appropriately set, and substituted for the calculation formula of the resonance frequency. Therefore, by setting the frequency of the sound to be reduced in the sound absorbing member 1 as the resonance frequency and setting the parameters of the above-mentioned portions of the sound absorbing unit 30 so as to obtain this resonance frequency, the strength of the sound generated by the sound source can be reduced. . In the present specification, “sound absorption” includes, in addition to the meaning of absorbing 100% of the sound, reducing the strength of the sound by several db.

  According to the sound absorbing member 1 of the first embodiment described above, the sound absorbing unit 30 of the sound absorbing structure 40 attenuates the vibration of the air having the energy of the sound generated by the sound source, so the strength of the sound generated by the sound source It can be reduced. In addition, since the ventilation part 20 of the sound absorbing structure 40 penetrates between the first surface 10 a and the second surface 10 b of the base material 10, one side of the base material 10 is transferred to the other side. Air can be distributed. The vibration of the air flowing through the ventilation unit 20 is attenuated in the sound absorbing unit 30, so the intensity of the sound emitted from the ventilation unit 20 can be reduced. Therefore, the sound absorbing member 1 of the first embodiment is excellent in both the sound absorbing property and the heat releasing property.

In the sound absorbing member 1 of the first embodiment, since the sound absorbing unit 30 is configured as a Helmholtz resonator, the resonance frequency of the sound absorbing unit 30 can be reduced by appropriately setting each parameter of the sound absorbing structure 40. Can be adjusted to the frequency of the sound generated by the sound source. Therefore, the strength of the sound generated by the sound source can be reduced more effectively.
In the sound absorbing member 1 of the first embodiment, a plurality of sound absorbing portions 30 are provided along the penetrating direction (Z direction) of the ventilation portion 20. Further, a plurality of sound absorbing units 30 are provided along the outer side surface of the ventilation unit 20. Therefore, as in the sound insulation panel of Patent Document 1 described above, the strength of sound can be more effectively reduced compared to a structure in which a plurality of columnar cells are provided in a planar manner.

Second Embodiment
Next, the building panel 2 provided with the sound absorption member 1 is demonstrated as 2nd Embodiment. In the description of the second embodiment and the drawings, the same members as those of the first embodiment are denoted by the same reference numerals as the first embodiment, and the redundant description will be omitted.
FIG. 4: is a disassembled perspective view which shows the structure of the building panel 2 of 2nd Embodiment.
As shown in FIG. 4, the building panel 2 of the second embodiment includes the sound absorbing member 1 of the first embodiment and a panel material 50. The panel material 50 is a member used for a wall material, a ceiling material, a floor material, a partition material and the like in a building, and examples thereof include a decorative board, a heat insulating sheet, a light shielding sheet and the like. An opening 51 is provided in the panel member 50 at a position corresponding to the ventilation portion 20 of the sound absorbing member 1.

  Although FIG. 4 shows an example in which the panel member 50 is provided on the upper surface (+ Z side) of the sound absorbing member 1, the panel member 50 having the same function as the panel member 50 of the upper side is different from the sound absorbing member 1. You may provide in the surface of the lower side (-Z side). Also, a plurality of panel members 50 may be laminated on one side or both sides of the sound absorbing member 1. In this configuration, for example, when the panel material 50 having air permeability is provided in the outermost layer, the opening can be omitted, so that not only designability is improved, but also the inside of the building panel 2 can be hardly seen.

Third Embodiment
Next, as a third embodiment, a sound absorbing case 3 configured by a plurality of sound absorbing members 1 will be described.
FIG. 5 is a perspective view showing the configuration of the sound absorbing case 3 of the third embodiment. In FIG. 5, the sound absorbing structure 40 provided in the sound absorbing member 1 is not shown.
As shown in FIG. 5, the sound absorbing case 3 of the third embodiment is configured as a cube so as to surround the device M as a sound source such as a generator. Specifically, the sound absorbing case 3 is configured by combining the sound absorbing members 1 of the first embodiment in a box frame shape and joining adjacent side edges. For bonding of adjacent side edges, for example, bonding, welding, screwing or the like is used.
According to the sound absorbing case 3 of the third embodiment, since the sound absorbing member 1 is disposed so as to surround the device M serving as a sound source, the intensity of the sound generated by the device M can be reduced more effectively.

  As mentioned above, although embodiment of this invention was described, this invention is not limited to embodiment mentioned above, A various deformation | transformation and change are possible like the modification mentioned later, These are also this invention Fall within the technical scope of Further, the effects described in the embodiments are only listing of the most preferable effects arising from the present invention, and are not limited to those described in the embodiments. In addition, although the above-mentioned embodiment and the below-mentioned modification can be combined suitably, and can also be used, detailed explanation is omitted.

(Modified form)
FIG. 6 is a perspective view showing the configuration of the sound absorbing member 1A in the first modified embodiment. In the first modification, the structure of the sound absorbing structure 40 is the same as that of the first embodiment, and thus the description thereof is omitted.
As shown in FIG. 6, in the sound absorbing member 1A of the first modified embodiment, the base material 10A is configured of plate members 101, 102, 103, 104, 105, and 106. The plate members 101 and 102 are plate members disposed on the upper side (+ Z side) and the lower side (−Z side) of the base material 10A, respectively. The plate members 103, 104, 105, and 106 are a side surface on the right side (+ X side), a side surface on the left side (−X side), a side surface on the front side (+ Y side), and a side surface on the back side (−Y side) It is a member arranged in As a material which comprises board material 101-106, resin materials, such as wood and a plastic, metal materials, such as aluminum, are mentioned, for example.
Since the inside of the base material 10A is hollow, the sound absorbing member 1A of the present embodiment can reduce the weight of the sound absorbing member 1A while maintaining the sound absorbing property and the air permeability. In the sound absorbing member 1A shown in FIG. 6, the inside may be filled with a heat insulating material, a sound insulating material or the like.

FIG. 7 is a perspective view showing a configuration of a sound absorbing member 1B in the second modified embodiment. In the second modified embodiment, the structure of the sound absorbing structure 40 is the same as that of the first embodiment, so the description will be omitted.
As shown in FIG. 7, in the sound absorbing member 1B according to the second modification, the base 10B is formed into a hollow box frame by the plates 101 to 106 in the same manner as the base 10A according to the first modification described above. There is. The sound absorbing member 1B of the second modified embodiment is different from the first modified embodiment in that the inside of the base material 10B is partitioned by the partition member 107. The partition members 107 are provided in a grid so as to partition the adjacent sound absorbing structure 40.
According to the sound absorbing member 1B of the present embodiment, since the inside of the base material 10B is partitioned by the partition member 107, the rigidity can be generally improved while maintaining the sound absorbing property and the air permeability.

FIG. 8 is an exploded perspective view showing a configuration of a sound absorbing member 1C in the third modified embodiment. FIG. 8 is an exploded perspective view of the portion provided with the sound absorbing structure 40A (see FIG. 9). FIG. 9 is a cross-sectional view of a sound absorbing member 1C in the third modified embodiment. FIG. 9 is a cross-sectional view corresponding to FIG.
As shown in FIG. 8, the sound absorbing member 1 </ b> C in the third modified embodiment is configured by plate members 210, 220, and 230. As a material which comprises board material 210-230, resin materials, such as plastic, metal materials, such as aluminum, are mentioned, for example.

Holes 211 are formed in the plate member 210. The hole portion 211 is a part of the opening and the inner side surface on the + Z side of the sound absorbing structure 40A, as shown in FIG.
In the plate member 220, a hole 221 and a sound absorbing portion 222 communicating with the hole 221 are formed. The hole 221 is an inner side surface of the sound absorbing structure 40A as shown in FIG. The sound absorbing unit 222 is a portion corresponding to the sound absorbing unit 30 of the first embodiment.
Holes 231 are formed in the plate member 230. The hole portion 231 becomes a part of the opening and the inner side surface on the + Z side of the sound absorbing structure 40A, as shown in FIG.
In addition, in the third modified embodiment, by further adding the plate members 220 and 230 to the lower side (−Z side) of the plate member 230, the same configuration as the sound absorbing structure 40 (see FIG. 2) of the first embodiment is provided. Can.

  By laminating the plate members 210, 220 and 230 described above in the order shown in FIG. 8 through the adhesive layer (not shown), as shown in FIG. 9, the sound absorbing member 1C provided with the sound absorbing structure 40A inside It can be made. The sound absorbing structure 40A includes the ventilation portion 20 and the sound absorbing portion 30 as in the sound absorbing structure 40 of the first embodiment. According to the sound absorbing member 1C of the present embodiment, there is no need to prepare the sound absorbing structure 40A as a separate part, so that the component parts can be simplified. In addition, 1 C of sound absorbing members provided with the sound absorbing structure 40A of this form can also be produced by 3D printer for resin or metal, for example, without laminating | stacking a board | plate material.

(Other variants)
In the first embodiment, as shown in FIG. 2A, an example in which the planar shape of the ventilation portion 20 when viewed from the penetration direction (Z direction) is circular is described, but the invention is not limited thereto. The planar shape of the ventilation part 20 may be a triangle, or may be a quadrangle or more. Further, the planar shape of the ventilation portion 20 may be a parallelogram, a rhombus, a trapezoid, a semicircle, an ellipse (semi-elliptic, long oval) or the like, or a combination thereof.
In the first embodiment, as shown in FIG. 1, an example in which the sound absorbing unit 30 has a cylindrical shape (the cross section has a concave shape) has been described, but the present invention is not limited thereto. For example, the sound absorbing unit 30 may have a convex cross section. That is, the sound absorption unit 30 may have any shape as long as it functions as a Helmholtz resonator.

  In the first embodiment, as shown in FIG. 2B, the center lines c1 of the two sound absorbing portions 30 are positioned on the same straight line in plan view when the ventilation portion 20 is viewed from the penetration direction (Z direction). Although the example which comprised so that it showed was shown, it is not limited to this. The center lines c1 of the two sound absorbing units 30 may be configured to intersect at an angle other than 0 ° or 180 °. Moreover, the sound absorption part 30 may be provided in three or more places in planar view. In that case, the center lines c1 of the respective sound absorbing portions 30 may be configured to be at equal intervals with respect to the center line c2 of the ventilation portion 20, or may be configured to have different intervals.

In the first embodiment, as shown in FIG. 2A, an example is described in which the center line c1 of the sound absorbing unit 30 is orthogonal to the center line c2 in the penetrating direction (Z direction) of the ventilation unit 20, but is limited thereto I will not. The center line c1 of the sound absorbing unit 30 may intersect at a predetermined angle with respect to the center line c2 in the penetration direction (Z direction) of the ventilation unit 20.
In the first embodiment, as shown in FIG. 2A, the sound absorbing units 30 are disposed such that the center lines c1 of the sound absorbing units 30 facing each other coincide with each other in the left-right direction (X direction) of the ventilation unit 20 However, the present invention is not limited thereto. The sound absorbing units 30 may be arranged such that the center lines c1 of the respective sound absorbing units 30 are different in the left-right direction (X direction) of the ventilation unit 20.

1, 1A, 1B, 1C Sound absorbing member 2 Building panel 3 Sound absorbing case 10, 10A, 10B Base material 10a First surface 10b Second surface 20 Ventilation section 30 Sound absorption section 40 Panel material 50, 50A Sound absorption structure

Claims (5)

A substrate having a first surface and a second surface opposite to the first surface;
At least one vent through the space between the first side and the second side of the substrate;
At least one sound absorbing portion provided on an outer peripheral side of the ventilation portion and in communication with the ventilation portion;
Equipped with
The sound absorbing member is a Helmholtz resonator, wherein the sound absorbing portion is a cylindrical closed space extended in a direction intersecting the penetrating direction of the vent . In the sound absorbing member according to claim 1 ,
The sound absorbing member is provided in a plurality along the penetrating direction of the ventilation portion. In the sound absorbing member according to claim 1 or 2 ,
The sound absorbing member is provided with a plurality of sound absorbing parts along the outer side surface of the ventilation part. A sound absorbing member according to any one of claims 1 to 3 ;
A panel material on which the sound absorbing member is installed;
Architectural panel equipped with A sound absorbing case comprising the sound absorbing member according to any one of claims 1 to 3 and surrounding the device serving as a sound source.

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