JP2012159020A - Noise reduction structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a noise reduction structure capable of efficiently reducing noise generated inside a gas flow passage and preventing gas from leaking.SOLUTION: The noise reduction structure 10 includes a plurality of openings 12 provided on a partition wall 11a for forming an air conditioner duct, a porous member 13 provided so as to close the openings 12, an airtight member 14 provided so as to coat an outer surface of the porous member 13, and a porous member 15 provided so as to coat an outer surface of the air-tight member 14. The porous member 13, the air-tight member 14, and the porous member 15 are provided on a surface of the partition wall 11a in a stacked manner. Peripheral portions 13a, 15a 14a are adhered or welded to one another and besides a frame member 16 for covering the peripheral portion 15a of the porous member 15. are adhered or welded to the partition wall 11a to thereby be fixed thereto.

Description

  The present invention relates to a technique for reducing noise generated from various gas flow paths such as an intake duct and an air conditioner duct of an automobile.

  Various technologies have been proposed for reducing the noise generated when gas passes through the air intake duct and air conditioning duct of automobiles. The typical method is the resonator method or non-reflective method. (For example, see Patent Documents 1 and 2).

  The resonator method described in Patent Document 1 is obtained by connecting a resonance member called a resonator to a branch path provided in a part of a gas flow path. The non-reflective method described in Patent Document 2 is a partition that forms a gas flow path. A breathable member such as a non-woven fabric is attached to an opening provided in a part. Both the resonator method and the non-reflective method have advantages and disadvantages, but the non-reflective method is said to be superior from the viewpoint of space saving and weight reduction.

JP 2009-203901 A JP 2008-128168 A

  As described above, when comparing the resonator method and the non-reflective method, the non-reflective method is superior in terms of space saving and weight reduction, but in the case of the non-reflective method, the gas passing through the duct is Since it may leak through a nonwoven fabric or the like attached to the opening, the intake duct causes a decrease in intake efficiency, and the air conditioner duct causes a decrease in air conditioning efficiency.

  The problem to be solved by the present invention is to provide a noise reduction structure that can efficiently reduce noise generated in a gas flow path and that does not cause gas leakage.

  The noise reduction structure of the present invention covers an opening formed in a partition wall forming a gas flow path, a porous member attached so as to close the opening, and an outer surface of the porous member. And an airtight member attached thereto.

  With this configuration, sound generated in the gas flow path can pass through the porous member and the airtight member in the opening, and the gas moving in the gas flow path is blocked by the airtight member in the opening. Therefore, the opening has a function of allowing sound to pass but not allowing gas to pass. Therefore, noise generated in the gas flow path can be efficiently reduced, and gas leakage does not occur.

  Here, it is desirable to coat the outer surface of the airtight member with a porous member.

  With such a configuration, since the airtight member is sandwiched between the two porous members, noise reduction is enhanced, and changes in the wind pressure, air volume, and wind flow in the gas flow path are eliminated. Can do.

  Moreover, as the porous member, a sheet material made of foamed synthetic resin, a net material made of synthetic resin, or a member combining them is suitable. In this case, the gas permeability of the porous member is desirably 85% or more.

  Furthermore, as the airtight member, a synthetic resin film material is suitable. The thickness of the film material is desirably 0.1 mm or less.

  On the other hand, it is desirable that the partition, the porous member, and the airtight member forming the gas flow path are formed of substantially the same material. With such a configuration, it is possible to recycle and use the partition walls, the porous member, and the airtight member after they have been used without being individually decomposed, thereby improving recyclability. To do.

  According to the present invention, it is possible to provide a noise reduction structure that can efficiently reduce noise generated in a gas flow path and that does not cause gas leakage.

It is a perspective view which shows the noise reduction structure which is embodiment of this invention. It is a disassembled perspective view which shows the structure of the noise reduction structure shown in FIG. It is a fragmentary sectional view of the noise reduction structure shown in FIG.

  As shown in FIG. 1, the noise reduction structure 10 of this embodiment is implemented in the air-conditioner duct 11 which is a gas flow path equipped on the back side of the automobile instrument panel. As shown in FIG. 2, the noise reduction structure 10 includes a plurality of openings 12 provided in a partition wall 11 a that forms an air conditioner duct 11, a porous member 13 attached so as to close the openings 12, and a porous structure. An airtight member 14 attached so as to cover the outer surface of the material member 13 and a porous member 15 attached so as to cover the outer surface of the airtight member 14 are provided.

  As shown in FIGS. 2 and 3, the porous member 13, the airtight member 14 and the porous member 15 are attached to the surface of the partition wall 11a in a laminated state, and the peripheral edge portions 13a, 15a and 14a are bonded or welded to each other. At the same time, the frame material 16 covering the peripheral edge 15a of the porous member 15 is fixed to the partition wall 11a by bonding or welding to the partition wall 11a.

  As shown in FIG. 3, the sound S generated in the air conditioner duct 11 can diffuse outside through the porous members 13 and 15 and the airtight member 14 of the opening 12, and the air moving in the air conditioner duct 11. Since A is blocked by the airtight member 14 of the opening 12, the opening 12 exhibits the function of allowing the sound S to pass but not the air A. Therefore, noise generated in the air conditioner duct 11 can be efficiently reduced, and no air leakage occurs.

  In the noise reduction structure 10, the outer surface of the airtight member 14 is further covered with the porous member 15, thereby forming a state in which the airtight member 14 is sandwiched between the two porous members 13 and 15. . For this reason, not only an excellent noise reduction effect can be exhibited, but also changes in wind pressure, air volume, and wind flow in the air conditioner duct 11 can be eliminated.

  Further, as shown in FIG. 2, in the noise reduction structure 10, the plurality of openings 12 provided in the partition wall 11 a of the air conditioner duct 11 are all circular, but the present invention is not limited thereto. The shape, size, number, etc. can be arbitrarily set according to the implementation status.

  Furthermore, although the synthetic resin sponge sheet is used as the porous members 13 and 15, and the synthetic resin wrap film is used as the airtight member, it is not limited to this, and has similar properties. Other materials can also be used.

  As shown in FIG. 1, the noise reduction structures 10 are arranged at a plurality of locations of the air conditioner duct 11, but the locations and sizes thereof are not limited, so the portions and flow paths where the air flow direction is changed are narrowed. It is desirable to arrange it in a part where noise is likely to occur, such as a part where it is present.

  Moreover, in this embodiment, since the partition 11a, the porous members 13, 15 and the airtight member 14 forming the air conditioner duct 11 are all formed of substantially the same material (substantially the same synthetic resin material), the use is finished. When the air conditioner duct 11 is recycled, the wall 11a, the porous members 13, 15 and the airtight member 14 can be recycled together without disassembling them individually.

  In addition, although the noise reduction structure 10 is implemented in the air-conditioner duct 11 of a motor vehicle, since the use and application field of this invention are not limited to this, the air-conditioning equipment which has the gas flow path divided by the partition, or various It can be widely used as noise reduction means in mechanical devices.

  The noise reduction structure of the present invention can be widely used as means for reducing noise generated from various gas flow paths such as an intake duct, an air conditioner duct, or an air conditioning duct of an automobile.

DESCRIPTION OF SYMBOLS 10 Noise reduction structure 11 Air-conditioner duct 11a Partition 12 Opening part 13,15 Porous member 14 Airtight member 13a, 14a, 15a Perimeter part 16 Frame material A Air S Sound

Claims (5)

  An opening established in a partition wall forming a gas flow path, a porous member attached to close the opening, and an airtight member attached to cover the outer surface of the porous member; A noise reduction structure characterized by comprising   The noise reduction structure according to claim 1, wherein an outer surface of the airtight member is covered with a porous member.   The noise reduction structure according to claim 1 or 2, wherein the porous member is a foamed synthetic resin sheet material or a synthetic resin mesh material.   The noise reduction structure according to claim 1, wherein the airtight member is a synthetic resin film material.   The noise reduction structure according to any one of claims 1 to 4, wherein the partition, the porous member, and the airtight member that form a gas flow path are formed of substantially the same material.

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