JPH11338477A - Sound absorbing material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily attach and detach a sound absorbing material to and from a fitting surface of a fitting object by providing a sucker structure as a fixing means to the fitting object. SOLUTION: A designated portion on the flat surface of a sound absorbing material 1 is provided with a sucker mounting part 7 for mounting a sucker structure (sucker) 8 on the sound absorbing material 1, and the sucker structure 8 is installed with the bottom up on the sucker mounting part 7. The sucker mounting part 7 is integrated with the base plate part 2. The sucker structure 8 is so constructed that the head 13 is integrated with the upper part of the disc-like main body, the lower surface of which is recessed, and the neck is provided with an annular engagement groove 14 engaged with the opening peripheral edge part of a sucker mounting hole 11. By the sucking action of the sucker structure 8, the sound absorbing material 1 can be easily attached and detached to and from a fitting surface of a fitting object, and after installation, the removal can be easily done. The sucking action of the sucker structure 8 in this case is such that fastening force is obtained by using atmospheric pressure applied to the back of the sucker.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sound absorbing material attached to the surface of a soundproof wall, the inside of an engine room, or the like as a part of measures against noise.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 3, a large number of hollow box portions 53 which are attached to a surface or an inner surface of an attachment object 51 to form a Helmholtz resonator 52 are shown (only one is shown in the figure). A resin-made sound absorbing material 54 is known (see JP-A-4-225398).

However, the sound absorbing material 54 is conventionally mounted on the mounting object 51 by fixing means such as riveting, bonding or welding.

[0004] Therefore, once the sound absorbing material 54 is attached to the mounting object 51 by these fixing means, there is a disadvantage that it is difficult to remove it. When the material of the sound absorbing material 54 is a hardly-adhesive material such as polypropylene (PP), the sound absorbing material 54 is attached to the object 5 by an adhesive means.
There is an inconvenience that it cannot be attached to 1.

[0005]

SUMMARY OF THE INVENTION In view of the above, it is an object of the present invention to provide a sound-absorbing material having a mounting structure or a fixing structure which can be easily removed once it is mounted. It is an object of the present invention to provide a sound-absorbing material having a mounting structure or a fixing structure that can be mounted even when the material of the material is a poorly adhesive material such as polypropylene.

[0006]

To achieve the above object, the sound absorbing material according to the first aspect of the present invention is characterized in that it has a suction cup structure as a means for fixing to a mounting object.

A sound absorbing material according to a second aspect of the present invention is characterized in that the sound absorbing material has a magnet structure as a means for fixing to a mounting object.

The sound absorbing material according to the first aspect of the present invention having the above structure has a suction cup structure as a means for fixing to the mounting object, or the sound absorbing material according to the second aspect of the present invention If a magnet structure is provided as a fixing means for the sound absorbing member, the sound absorbing material can be easily attached to and detached from the object to be mounted because the sucker structure or the magnet structure is a detachable fixing structure. Further, since the material of the sound absorbing material is not directly related to the fixing, even if the material of the sound absorbing material is a hardly-adhesive material such as polypropylene, the sound absorbing material can be attached to the mounting target.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described with reference to the drawings.

First Embodiment As shown in FIG. 1, a sound-absorbing material 1 according to the first embodiment uses a resin such as a polyolefin resin such as polypropylene, an ABS resin, a polyethylene resin or a vinyl chloride resin as a molding material. A large number of hollow three-dimensional boxes (also referred to as resonator cases or raised portions) 3 are integrally formed (vacuum formed) on a flat substrate (also referred to as a flat plate portion or a reference flat portion) 2 in the same direction. .

Each of the hollow three-dimensional box portions 3 has a truncated pyramid shape of a plane quadrangle, and is formed integrally with the side wall 4 (also referred to as a side surface, a peripheral wall, or a peripheral surface) 4 having a sloped shape. A flat rectangular end wall (also referred to as an end surface, a top wall or a top surface) 5 is integrally provided, and a hole-shaped orifice 6 having a plane circular shape is provided at the center of the end wall 5. Although the end wall 5 is formed parallel to the substrate portion 2, the end wall 5 may be formed to be not parallel but inclined depending on the limitation of the mounting space or the direction of the sound source. It is preferable to face the same).

At a predetermined position on the plane of the sound absorbing material 1, a suction cup mounting portion 7 for mounting a suction cup structure (also simply referred to as a suction cup) 8 to the sound absorbing material 1 is provided. The structure 8 is mounted downward. The suction cup mounting part 7 is formed integrally with the substrate part 2.

The suction cup mounting portion 7 has a flat quadrangular truncated pyramid shape, and is formed integrally with a side wall 9 (also referred to as a side surface, a peripheral wall, or a peripheral surface) 9 having a sloped shape. A flat rectangular end wall (also referred to as an end surface, a top wall or a top surface) 10 is provided integrally, and at the center of the end wall 10,
A suction cup mounting hole 11 having a flat circular shape is provided. The end wall 10 is formed in parallel with the substrate 2. still,
Since the suction cup mounting portion 7 has the same configuration as the box portion 3, any of the box portions 3 can be used as the suction cup mounting portion 7 if the conditions such as the height and the volume are satisfied. .

The suction cup structure 8 is formed by integrally forming a head 13 on an upper part of a disc-shaped main body 12 having a concave lower surface. Are provided.

The sound-absorbing material 1 having the above-described structure is formed by superimposing the board portion 2 on a mounting object 51 having a flat plate shape and a mounting surface, so that each box portion 3 has a Helmholm having an air chamber 16. Resonators (also referred to as Helmholtz resonators, a mechanism in which sound energy is attenuated by vibrating with the orifice 6 and an air spring in the air chamber 16) 15 are formed, and the surface (side wall 4 and end wall 5) of each Helmholtz resonator 15 is formed. Function as a plate-like sound absorbing material (mechanism for vibrating the plate to absorb sound energy), and have a sound absorbing effect, and are characterized in that the following effects are achieved by the above configuration.

That is, first, since the suction structure 8 is provided as a fixing means to the mounting object 51, the sound absorbing material 1 is easily attached to and detached from the mounting surface of the mounting object 51 by the suction action of the suction structure 8. This makes it possible to extremely easily remove the device once it has been attached.
The suction effect of the suction cup structure 8 is to obtain a fastening force by using the atmospheric pressure applied behind the suction cup.

Further, since the suction cup structure 8 is in charge of fixing and the material of the sound absorbing material 1 is not directly related to the fixing, the sound absorbing material 1 is fixed.
The sound absorbing material 1 can be attached to the attachment object 51 even if the material is a poorly adhesive material such as polypropylene as long as the attachment surface of the attachment object 51 is a smooth surface.

Further, since the fixing can be performed without using an adhesive, the mounting object 51 can be prevented from being stained by the adhesive.

Also in the case where an adhesive is used, since the suction cup structure 8 can be used for temporary fixing, an adhesive having a long fixing time can be used.

Second Embodiment As shown in FIG. 2, the sound-absorbing material 1 according to this embodiment is formed by using a resin such as a polyolefin resin such as polypropylene, an ABS resin, a polyethylene resin or a vinyl chloride resin as a molding material. A large number of hollow three-dimensional boxes (also referred to as resonator cases or raised portions) 3 are integrally formed (vacuum formed) on a flat substrate (also referred to as a flat plate portion or a reference flat portion) 2 in the same direction. .

Each of the hollow three-dimensional box portions 3 has a shape of a flat quadrangular truncated pyramid, and is formed integrally with the four side walls (also referred to as a side surface, a peripheral wall, or a peripheral surface) 4 having a sloped shape. A flat rectangular end wall (also referred to as an end surface, a top wall or a top surface) 5 is integrally provided, and a hole-shaped orifice 6 having a flat circular shape is provided at the center of the end wall 5. Although the end wall 5 is formed parallel to the substrate portion 2, the end wall 5 may be formed to be not parallel but inclined depending on the limitation of the mounting space or the direction of the sound source. It is preferable to face the same).

A magnet mounting portion 21 for mounting a magnet structure 22 to the sound absorbing material 1 at a predetermined position on the plane of the sound absorbing material 1.
And a magnet structure (also simply referred to as a magnet) 22 is mounted on the magnet mounting portion 21. The magnet mounting part 21 is formed integrally with the substrate part 2.

The magnet mounting portion 21 is integrally formed with a bottom portion 23 and a side portion 24 and is formed in a groove shape having an open upper surface, and the magnet structure 22 is accommodated in the groove. The bottom part 23 is a part of the substrate part 2.

The magnet structure 22 is a permanent magnet having a predetermined length and a rectangular cross section. The permanent magnet is housed in the groove-shaped magnet mounting portion 21 described above.

The sound-absorbing material 1 having the above-mentioned structure is a magnetic object 5 having a flat plate shape and a mounting surface.
By superimposing the substrate part 2 and the bottom part 23 on the first unit 1, in each box part 3, the sound energy is transmitted to the orifice 6 and the air spring 15 is formed, and the surface (side wall 4 and end wall 5) of each Helmholtz resonator 15 is made to function as a plate-like sound absorbing material (a mechanism in which the plate vibrates to absorb sound energy). It has a sound absorbing effect, and is characterized in that the following effects are achieved by the above configuration.

That is, first, since the magnet structure 22 is provided as a fixing means to the mounting object 51, the sound absorbing material 1 is attached to the mounting surface of the magnetic mounting object 51 by the attracting action of the magnet structure 22. It can be easily attached and detached, and once attached, can be removed very easily.

Further, since the magnet structure 22 is in charge of fixing and the material of the sound absorbing material 1 is not directly related to the fixing, even if the material of the sound absorbing material 1 is a poorly adhesive material such as polypropylene, the mounting object 51 is not required. Is a magnetic material such as SPCC or SPHC, the sound absorbing material 1 can be attached to the attachment target 51.

Further, since fixing can be performed without using an adhesive, it is possible to prevent the mounting object 51 from being stained by the adhesive.

Also, when an adhesive is used, since the magnet structure 22 can be used for temporary fixing, an adhesive having a long fixing time can be used.

The magnet structure 22 is formed by mixing a powdery or granular magnet with the resin material of the sound absorbing material 1 to form the sound absorbing material 1, so that the sound absorbing material 1 itself has a magnetic force and has a magnetic structure. Making it work is also conceivable.

[0031]

The present invention has the following effects.

In other words, since both the first and second aspects have a sucker structure or a magnet structure as a means for fixing to the object to be mounted, the sound absorbing material is mounted by the suction effect of these structures. The object can be easily attached to and detached from the attachment surface, and once attached, can be removed very easily.

Further, since the sound absorbing material or the magnet structure is in charge of fixing and the material of the sound absorbing material is not directly related to the fixing, even if the material of the sound absorbing material is a poorly adhesive material such as polypropylene, the sound absorbing material is not affected. The material can be attached to the attachment target.

Further, since fixing can be performed without using an adhesive, it is possible to prevent contamination of the mounting object with the adhesive beforehand.

Also in the case where an adhesive is used, since a suction cup structure or a magnet structure can be used for temporary fixing, an adhesive having a long fixing time can be used.

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part of a sound absorbing material according to a first embodiment of the present invention.

FIG. 2 is a sectional view of a main part of a sound absorbing material according to a second embodiment of the present invention.

FIG. 3 is a sectional view of a main part of a sound absorbing material according to a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Sound absorbing material 2 Substrate part 3 Box part 4, 9 Side wall 5, 10 End wall 6 Orifice 7 Suction cup mounting part 8 Suction cup structure 11 Suction cup mounting hole 12 Disk-shaped main body 13 Head 14 Engagement groove 15 Helmholm resonator 16 Air chamber DESCRIPTION OF SYMBOLS 21 Magnet mounting part 22 Magnet structure 23 Bottom part 24 Side part 51 Object to be mounted

Claims (2)

[Claims] 1. A sound-absorbing material characterized by having a suction cup structure (8) as means for fixing to a mounting object (51). 2. A sound-absorbing material having a magnet structure (22) as means for fixing to a mounting object (51).