JP2000309989A - Sound-absorbing panel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sound-absorbing panel inhibiting the reflection of a sound wave of a surface, and an echo sound from a rear and being capable of displaying excellent sound-absorbing performance. SOLUTION: A sound-absorbing board 1, which absorbs a sound from a surface and through which the sound is propagated a sound-wave interference air layer 2 making the sound wave interfere and attenuating it, and a reflecting board 3 reflecting the sound wave are disposed in three-layer structure towards the rear side from the surface side. These boards and layer are held by forms 4 while the sound-absorbing board 1 is assistingly supported freely toward the surface side to the forms 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sound absorbing panel used for a soundproof partition or a soundproof wall.

[0002]

2. Description of the Related Art A conventional sound-absorbing panel is used as a sound-absorbing panel made of a porous plate or the like, or a sound-absorbing surface of a sound-absorbing box formed by combining with a glass wool, a honeycomb structure plate or a reflector. Some had fixed boards.

[0003]

However, in the above conventional example, since the sound absorbing plate is fixed around the sound absorbing plate, the sound wave is not sufficiently vibrated. Therefore, the sound absorption performance is poor because some of the sound wave is reflected and returned to the sound source side without being absorbed, and the absorbed sound wave is not fully absorbed in the sound absorbing box and passed through to the back side. It was not enough.

There is also a problem that sound waves are reflected by the reflector on the back side, and the reflected sound waves reverberate in the box, resulting in a large reverberation sound.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a sound absorbing panel which can solve such a problem and suppress the reflection of sound waves on the front side and the reverberation sound from the back side and can exhibit excellent sound absorbing performance. I do.

[0006]

In order to achieve the above object, the present invention provides a sound absorbing plate for absorbing and transmitting sound from a surface, a sound wave interference air layer for interfering and attenuating sound waves, and a sound wave reflecting surface. And a reflecting plate to be disposed in a three-layer structure from the front side to the back side, and these are held by a mold, and the sound absorbing plate is freely moved forward and backward with respect to the mold toward the front side. It is characterized by support from the public.

According to the present invention, the sound wave propagating to the surface of the sound absorbing panel first strikes the sound absorbing plate, vibrates it, and converts the vibration energy into heat to be absorbed and transmitted. It is absorbed by being interfered and attenuated in the layer. At this time, the sound absorbing plate is biased and supported free to move forward and backward with respect to the formwork toward the surface side, so vibration is reduced compared to the conventional example in which the periphery is fixed to the formwork so that it cannot move. As a result, the vibration energy becomes large and the amount of change to heat becomes large, so that the sound absorbing performance is enhanced. Therefore, it is possible to reduce the amount of sound waves reflected by the sound absorbing plate and returning to the sound source side, and to absorb and transmit more sound waves. In addition, although the sound wave that has passed through the sound wave interference air layer is reflected by the reflection plate, the reflected sound wave is also interfered and attenuated in the sound wave interference air layer, so that the echo sound from the reflection plate can be suppressed. .

In the above structure, if the sound wave interference air layer is composed of a porous layer having an elastic restoring force and a honeycomb structure layer having a honeycomb space, the sound absorbing plate is moved relative to the mold by the elastic restoring force. It can be easily biased and supported free to move forward and backward, and can smoothly absorb sound waves as described above. The sound wave passes while being attenuated by the pores of the porous layer, is dispersed in the honeycomb space of the honeycomb structure layer, and the incident wave and the reflected wave are randomly attenuated by interference, while the sound wave reflected by the reflector is also the same. The sound absorption performance can be efficiently exhibited by dispersing and attenuating the interference. Note that the sound wave interference air layer may be composed of only a porous layer having a restoring elastic force.

In the above configuration, if a seal member is provided between the outer periphery of the reflection plate and the inner periphery of the mold, the sound wave passes through a gap such as a side peripheral path formed by a screw groove or the like of the mold. Leakage outside the panel can be prevented.

In the above configuration, if the reflecting plate has a structure in which the honeycomb structure plate is sandwiched between a pair of flat plates, sound waves reaching the reflecting plate are further dispersed in the honeycomb space formed by the flat plate and the honeycomb structure plate. Then, since it is interfered and attenuated, the reflection plate itself also exerts a sound wave absorbing effect, and can suppress the reverberation sound.Also, there is almost no sound wave passing through the reflection plate, so that the sound wave leaks out of the panel. Can be prevented.

In the above configuration, if the main material of the sound absorbing plate, the formwork, and the reflecting plate is made of a light metal such as aluminum, the weight of the sound absorbing panel can be reduced, and the weight of the sound absorbing panel is reduced to about 1/4 that of iron. be able to.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a sound absorbing panel according to the present invention will be described below with reference to the drawings.

As shown in FIGS. 1 to 3, a first embodiment of this sound absorbing panel is a sound absorbing plate 1 made of a porous plate, which absorbs sound from the surface and transmits it from the front side to the back side.
And a sound wave interference air layer 2 for causing sound waves to interfere and attenuate,
A reflector 3 for reflecting sound waves is provided in a three-layer structure, and these are fitted into a mold 4. Formwork 4 includes side surfaces 4b and 4c that cover the side peripheral surfaces 4 of the three layers,
Each of the side surfaces 4b and 4c forms a thin frame having a total of eight inward flanges 4a at upper and lower inner edges. One set of facing sides 4b has another side 4c
A screw groove 4e is formed integrally with the screw 6 for fixing the screw to a screw hole 4d provided at each of the four corners.

As shown in FIG. 3 (b), the sound absorbing plate 1 is composed of a pair of aluminum mesh metal plates 1b and 1b on both sides of a plate-like metal fiber group 1a. It is formed integrally. In the sound absorbing plate 1, sound waves vibrate the metal fiber group 1a and the mesh-like metal plates 1b and 1b, and a part of the vibration energy is converted into heat, thereby exhibiting sound absorbing performance. As the sound absorbing plate 1,
A sintered plate obtained by sintering particles such as aluminum particles so as to have many open cells may be employed.

As shown in FIG. 3 (a), the sonic interference air layer 2 is composed of a porous layer 2a uniformly filled with glass wool or a foamed resin having a large number of open cells, paper, aluminum and ceramics. And the like are arranged in a honeycomb shape. Honeycomb structure layer 2
In b, a large number of cylindrical honeycomb spaces 2c having a hexagonal cross section are formed.

The porous layer 2a attenuates sound waves passing through a large number of vertically penetrating pores and the respective honeycomb spaces 2c of the honeycomb structure layer 2b, and also reflects sound waves reflected from the reflecting plate 3 described later. It exerts a sound absorbing effect by interfering and attenuating. In addition, the porous layer 2
a is the sound absorbing plate 1 due to the restoring elastic force of the foamed resin.
To the front side of the mold frame 4 so as to freely move forward and backward.

As shown in FIG. 3 (c), the reflecting plate 3 has a pair of metal flat plates 3a, 3a superimposed on both surfaces of a metal honeycomb structure plate 3b having a relatively small thickness to integrate the three members. A large number of flat cylindrical honeycomb spaces 3 c having a hexagonal cross section are also formed in the reflector 3. A seal member 5 is provided between the outer periphery of the reflection plate 3 and the inner periphery of the side surface 4 c of the mold 4.
To prevent sound waves from leaking out of the reflecting plate 3 forming the back surface of the sound absorbing panel through the side peripheral path 6 formed by forming the screw groove 4e of the mold frame 4. Incidentally, it is also possible to form the reflecting plate 3 integrally with the mold 4 so that the back surface of the mold 4 also serves as the reflecting plate 3.

The sound absorbing plate 1 is urged toward the surface side (sound absorbing surface side) of the mold 4 by the elastic restoring force of the porous layer 2a of the sound wave interference air layer 2, and the inward direction of the mold 4 Flange 4
The forward movement is only restrained at a, and the form 4 is urged and supported by the formwork 4 so as to be free to move forward and backward.

If the surface of the sound absorbing plate 1 which is the sound absorbing surface of the sound absorbing panel of the first embodiment is set facing the sound source side,
The sound wave that has propagated to the surface first vibrates the sound absorbing plate 1, and the vibration energy changes into heat, thereby exhibiting sound absorbing performance. In the present embodiment, since the sound absorbing plate 1 is biased and supported with respect to the mold frame 4 as described above, the sound absorbing plate 1 is fixed to the mold frame 4 so as to be immovable therearound. Vibration is smoothed, sound waves are easily absorbed, and the amount of sound waves reflected on the surface and returning to the sound source side can be reduced.

Next, the sound wave is attenuated by the many pores of the porous layer 2a and passes therethrough, and then dispersed in the many honeycomb spaces 2c of the honeycomb structure layer 2b so that the incident wave and the reflected wave randomly interfere with each other. Is attenuated. Further, the sound wave passes through the honeycomb structure layer 2b, and then the metal flat plate 3a on the surface side of the reflection plate 3 is formed.
The reflected sound waves are also interfered and attenuated in the honeycomb structure layer 2b as described above, so that the reverberation sound from the reflector 3 can be suppressed. On the other hand, the sound wave transmitted through the metal flat plate 3a is also dispersed in the honeycomb space 3c formed by the metal honeycomb structure plate 3b, and is attenuated by interference, so that the sound wave passing through the metal flat plate 3a serving as the back surface of the sound absorbing panel is transmitted. It can be almost eliminated.

If the sound-absorbing air layer 2 has such a structure that the sound-absorbing plate 1 can be biased and supported with respect to the mold frame 4 toward the front surface side, the reflecting plate 3 can be used. A simple spacer or the like that can form an air layer interposed between the sound absorbing plate 1 and the sound absorbing plate 1 may be employed.

Alternatively, as in the second embodiment shown in FIG. 4, the glass wool 7 may be uniformly filled as the sonic interference air layer 2.

The present invention can be configured in various modes in addition to the embodiments described above. For example, the sound absorbing panel has a flat surface (sound absorbing surface) and a back surface, but may have a curved shape. When the sound absorbing panel is mounted on a tunnel inner wall or the like, a sound absorbing plate 1, a sound interference air layer 2, a reflecting plate 3 is formed by bending according to the shape and curvature of the concave surface such as the inner wall. Also, if the mounting surface is convex, reverse it, etc.
Various changes can be made.

[0024]

According to the sound absorbing panel of the present invention, the vibration of the sound absorbing plate due to the sound wave is smoothed, the sound wave is sufficiently absorbed, and the absorbed sound wave or the sound wave from the reflecting plate is interfered with the sound wave interference air layer by the interference and attenuating action. By absorbing sound, reflection of sound waves on the front surface side and reverberation sound from the back side can be suppressed, and excellent sound absorbing performance can be exhibited.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing a part of a first embodiment of the present invention.

FIG. 2 is a vertical side view of the embodiment.

FIG. 3 is an exploded view showing an internal structure of the embodiment, and FIG.
1 is an overall view, (b) is an exploded view of a sound absorbing plate, and (c) is an exploded view of a reflecting plate.

FIG. 4 is a longitudinal side view showing a second embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Sound absorption plate 1a Metal fiber group 1b Mesh-shaped metal plate 2 Sound interference air layer 2a Porous layer 2b Honeycomb structure layer 2c Honeycomb space 3 Reflector 3a Metal plate 3b Metal honeycomb structure plate 3c Honeycomb space 4 Formwork 5 Sealing member 7 Glass wool (sound interference air layer)

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 2E001 DF04 GA07 GA29 GA32 GA81 GA83 GA87 HA14 HA33 HB01 HB04 HC07 HD01 LA01 4F100 AB01 AB10 BA03 BA07 BA10A BA10C DB16 DB17 DC01B DC01C DJ01B DJ03 JH01A JH02B JH10C JK07B JL03

Claims (6)

[Claims] 1. A sound absorbing plate that absorbs and transmits sound from a surface, a sound wave interference air layer that interferes and attenuates sound waves,
Turn the reflector that reflects the sound wave from the front side to the back side.
A sound-absorbing panel which is disposed in a layered structure, is held by a mold, and supports the sound absorbing plate with respect to the mold so as to freely advance and retreat toward the surface side. 2. The sound absorbing panel according to claim 1, wherein the sound wave interference air layer is composed of a porous layer having an elastic restoring force and a honeycomb structure layer having a honeycomb space. 3. The sound absorbing panel according to claim 1, wherein the sound wave interference air layer is constituted by a porous layer having a restoring elastic force. 4. The sound absorbing panel according to claim 1, wherein a sealing member is provided between an outer periphery of the reflection plate and an inner periphery of the mold. 5. The sound-absorbing panel according to claim 1, wherein the reflector has a honeycomb structure sandwiched between a pair of flat plates. 6. The sound absorbing panel according to claim 1, wherein a main material of the sound absorbing plate, the formwork, and the reflecting plate is a lightweight metal.