JP3522583B2 - Sound absorption panel - Google Patents

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 by converting a porous plate into a sound absorbing plate or by combining it with a glass wool, a honeycomb structure plate or a reflecting plate, and absorbing the sound on the sound absorbing surface of a sound absorbing box. There was a fixed plate.

[0003]

However, in the above-mentioned conventional example, since the sound absorbing plate is fixed around the sound absorbing plate, it is not sufficiently vibrated by sound waves. Therefore, some sound waves are not completely absorbed and are reflected back to the sound source side, or the absorbed sound waves cannot be fully absorbed in the sound absorbing box and are passed to the back side. It was insufficient.

There is also a problem that sound waves are reflected by the reflecting plate on the rear surface side, and the reflected sound waves reverberate inside the box, resulting in a large echo sound.

An object of the present invention is to solve the above problems and to provide a sound absorbing panel capable of exhibiting excellent sound absorbing performance by suppressing the reflection of sound waves on the front surface side and the reverberant sound from the back surface side. To do.

[0006]

In order to achieve the above object, the present invention has a sound absorbing plate that absorbs and transmits sound from the surface, a sound wave interference air layer that interferes and attenuates sound waves, and a sound wave is reflected. The reflecting plate and the reflecting plate are arranged in a three-layer structure from the front surface side to the back surface side, and these are held by a formwork, and the sound absorbing plate is attached to the formwork so that the sound absorption plate can move forward and backward. It is characterized by the fact that it is supported.

According to the present invention, the sound wave that has propagated to the surface of the sound absorbing panel first strikes the sound absorbing plate, vibrates it, and is absorbed and transmitted by changing its vibration energy into heat. It is absorbed by being interfered and attenuated in the layer. At that time, since the sound absorbing plate is urged to move forward and backward toward the front side of the mold, vibration is less likely to occur than in the conventional example in which the periphery of the sound absorbing plate is immovably fixed. Smoothly, the vibration energy becomes large, and the amount of change to heat becomes large, so that the sound absorbing performance is improved. Therefore, the sound waves reflected by the sound absorbing plate and returning to the sound source side can be reduced and more sound waves can be absorbed and transmitted. Further, although the sound wave that has passed through the sound wave interference air layer is reflected by the reflector, the reflected sound wave is also interfered and attenuated in the sound wave interference air layer, so that the reverberant sound from the reflector plate can be suppressed. .

In the above structure, if the acoustic interference air layer is composed of a porous layer having elastic restoring force and a honeycomb structure layer having honeycomb space, the elastic restoring force causes the sound absorbing plate to move against the mold. It can be easily biased and supported forward and backward, and can smoothly absorb sound waves as described above. Then, the sound wave passes while being attenuated in 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 interference-attenuated, while the sound wave reflected by the reflector is also the same. The sound absorption performance can be efficiently exhibited by being dispersed and interference-attenuated. The sound wave interference air layer may be composed of only a porous layer having a restoring elastic force.

In the above structure, if a seal member is arranged between the outer circumference of the reflector and the inner circumference of the mold, sound waves are transmitted through a gap such as a side circumferential path formed by a screw groove of the mold. It is possible to prevent leakage to the outside of the panel.

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

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

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a sound absorbing panel of the present invention will be described below with reference to the drawings.

As shown in FIGS. 1 to 3, the first embodiment of the sound absorbing panel is a sound absorbing plate 1 made of a porous plate and absorbing and transmitting sound from the front surface from the front surface side to the back surface side.
And a sound wave interference air layer 2 for interfering and attenuating sound waves,
A reflection plate 3 for reflecting sound waves is arranged in a three-layer structure, and these are fitted in a mold 4. The formwork 4 has side surfaces 4b and 4c that cover the three side surfaces 4a and 4b,
Each of the side surfaces 4b and 4c is a thin frame body having a total of eight inward flanges 4a on the upper and lower inner edges. One pair of side surfaces 4b facing each other has the other side surface 4c.
Is integrally formed with a screw groove 4e for screwing with a screw 6 in screw holes 4d provided at four corners thereof.

As shown in the exploded view of FIG. 3B, the sound absorbing plate 1 is formed by superposing a pair of aluminum mesh-like metal plates 1b and 1b on both surfaces 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-shaped metal plates 1b and 1b, and a part of the vibration energy is changed 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 a large number of open cells may be adopted.

As shown in the exploded view of FIG. 3 (a), the sound wave interference air layer 2 has a porous layer 2a homogeneously filled with glass wool, a foamed resin having a large number of open cells, and the like, paper, aluminum, and ceramics. And the like are formed in a honeycomb structure layer 2b. Honeycomb structure layer 2
A large number of tubular honeycomb spaces 2c having a hexagonal cross section are formed in b.

In the porous layer 2a, a large number of pores penetrating vertically and in each honeycomb space 2c of the honeycomb structure layer 2b attenuate the sound waves passing therethrough, and also the sound waves reflected from the reflection plate 3 described later. A sound absorption effect is exhibited 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.
Is urged to move forward and backward toward the front surface of the formwork 4.

As shown in the exploded view of FIG. 3 (c), the reflection plate 3 is formed by superposing a pair of metal flat plates 3a, 3a on both surfaces of a metal honeycomb structure plate 3b having a relatively small thickness. A large number of flat cylindrical honeycomb spaces 3c having a hexagonal cross section are formed in the reflecting plate 3 as well. Further, between the outer peripheral edge of the reflection plate 3 and the inner periphery of the side surface 4c of the mold 4, a seal member 5 is provided.
And prevents the sound wave from leaking out from the reflection plate 3 which is the back surface of the sound absorbing panel through the side circumferential path 6 formed by forming the screw groove 4e of the mold 4. It is also possible to form the reflector 3 integrally with the mold 4 so that the back surface of the mold 4 also serves as the reflector 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 is directed inward of the mold 4. Flange 4
The forward movement is only restrained by a, and the mold 4 is urged and supported in the forward and backward movement free manner.

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 installed facing the sound source side,
The sound wave propagating to the surface vibrates the sound absorbing plate 1 first, and this vibration energy is changed into heat, thereby exhibiting sound absorbing performance. In this embodiment, since the sound absorbing plate 1 is biased and supported with respect to the mold 4 so as to move back and forth, as compared with the case where the sound absorbing plate 1 is fixed so as not to move around the mold frame 4. The vibration becomes smooth, the sound wave is easily absorbed, and the amount of the sound wave reflected on the surface and returned to the sound source side can be reduced.

Next, the sound wave passes through while being attenuated by the large number of pores of the porous layer 2a, and then dispersed in the large number of honeycomb spaces 2c of the honeycomb structure layer 2b so that the incident wave and the reflected wave interfere with each other at random. Is attenuated. Further, the sound waves pass through the honeycomb structure layer 2b, and then the metal flat plate 3a on the surface side of the reflection plate 3
The reflected sound waves are also interfered and attenuated in the honeycomb structure layer 2b as described above, whereby the reverberant sound from the reflection plate 3 can be suppressed. On the other hand, the sound wave that passes through the metal flat plate 3a is also dispersed in the honeycomb space 3c formed by the metal honeycomb structure plate 3b, interfered with, and attenuated. It can be almost eliminated.

The sound wave interference air layer 2 is a reflection plate 3 as long as the sound absorption plate 1 has a structure capable of biasingly supporting the sound absorbing plate 1 toward the front side of the mold 4 so as to move back and forth. A simple spacer or the like that may be interposed between the sound absorbing plate 1 and the sound absorbing plate 1 to form an air layer may be adopted.

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

The present invention can be constructed in various modes in addition to the above-described embodiment. For example, although the front surface (sound absorption surface) and the back surface of the sound absorbing panel are formed in a flat shape, they may be formed in a curved shape. 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 to sufficiently absorb the sound wave, and the absorbed sound wave or the sound wave from the reflecting plate is interfered by the sound wave interference air layer. By absorbing the sound, it is possible to suppress the reflection of the sound wave on the front surface side and the reverberant sound from the back surface side, and exhibit excellent sound absorbing performance.

[Brief description of drawings]

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

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

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

FIG. 4 is a vertical cross-sectional side view showing a second embodiment of the present invention.

[Explanation of symbols]

1 sound absorbing plate 1a Metal fiber group 1b mesh metal plate 2 Sound wave interference air layer 2a porous layer 2b Honeycomb structure layer 2c Honeycomb space 3 reflector 3a Metal flat plate 3b Metal honeycomb structure plate 3c Honeycomb space 4 formwork 5 Seal member 7 glass wool (sound interference air layer)

Claims (6)

(57) [Claims] 1. A sound absorbing plate that absorbs and transmits sound from the surface, and a sound wave interference air layer that interferes and attenuates sound waves,
A reflector that reflects sound waves is directed from the front side to the back side 3
A sound absorbing panel, wherein the sound absorbing panel is arranged in a layered structure, and these are held by a mold, and the sound absorbing plate is urged and supported toward the front side of the mold so as to move forward and backward. 2. The sound absorbing panel according to claim 1, wherein the acoustic interference air layer comprises 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 formed of a porous layer having a restoring elastic force. 4. The sound absorbing panel according to claim 1, 2 or 3, wherein a seal member is arranged between the outer periphery of the reflection plate and the inner periphery of the mold. 5. The sound absorbing panel according to claim 1, 2, 3 or 4, wherein the reflection plate is formed by sandwiching a honeycomb structure plate with a pair of flat plates. 6. The sound absorbing panel according to claim 1, 2, 3, 4, or 5, wherein a main material of the sound absorbing plate, the mold, and the reflecting plate is a lightweight metal.