JP3588959B2 - Automotive sound absorbing structure - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a sound absorbing structure for a vehicle of an air conditioner used for improving occupant comfort, and more particularly to a sound absorbing structure for a vehicle that reduces the noise level of the air conditioner.
[0002]
[Prior art]
As shown in the schematic diagram of FIG. 3, in a conventional automobile air conditioner, there is no installation of a sound absorbing material or the like for reducing noise in a passage of air in the air conditioner or a rotating portion of a fan.
[0003]
[Problems to be solved by the invention]
Therefore, there have been problems such as an increase in noise as the air volume increases.
SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and provides a means for reducing the noise of a fan in an air conditioner and the noise generated due to the flow of air.
[0004]
[Means for Solving the Problems]
As means for solving the above problems, in the vehicle sound absorbing structure according to claim 1, an expansion part is provided in a part of the air flow path of the vehicle air conditioner, and the sound absorbing material is installed inside the expansion part at the same time. An air purifying layer that doubles as an air layer behind the sound absorbing material and that can trap deodorant function and antibacterial action or trap dust is also provided on the outer periphery of the sound absorbing material.
According to a second aspect of the present invention, in the vehicle sound-absorbing structure according to the first aspect, the sound-absorbing structure is provided on the entire circumference or a part of the outer circumference of the air flow path. The configuration was adopted.
According to a third aspect of the present invention, in the sound absorbing structure for an automobile according to the first aspect, the sound absorbing structure for an automobile is made of a fiber body mainly composed of polyethylene terephthalate.
According to a fourth aspect of the present invention, the fibrous body mainly composed of polyethylene terephthalate is laminated horizontally with respect to the air flow path.
In the sound absorbing structure for an automobile according to the fifth aspect, the sound absorbing material according to the first aspect is a low melting point polyester polyester sheath having a melting point of 200 ° C. or less and having a core component mainly composed of polyethylene terephthalate and a main copolymerization component of polyethylene terephthalate. The core-sheath type composite fiber having a fineness of 1 to 20 denier and a high melting point fiber mainly composed of polyethylene terephthalate having a fineness of 20 denier or less were used.
In the sound absorbing structure for an automobile according to the sixth aspect, the air purifying material according to the first aspect includes a high melting point fiber of 1 to 150 denier mainly composed of polyethylene terephthalate, a core component mainly composed of polyethylene terephthalate, and polyethylene terephthalate. A core-sheath type composite fiber composed of a sheath component of a low-melting point polyester polyester having a melting point of 200 ° C. or less as a main copolymer component, and a structure composed of fibers having a fineness of 1 to 20 denier.
According to a seventh aspect of the present invention, there is provided an automobile sound absorbing structure in which a polyester fiber as a main fiber constituting the air purifying material according to the sixth aspect carries or kneads a material having an antibacterial action.
[0005]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, the contents of the present invention will be described in detail.
In the present invention, as shown in FIG. 1, an extension 3, a sound absorbing material 4, and an air purifying material 5 are provided in a part of the air flow path, as shown in FIG. It is possible to set a frequency range that can be reduced by the volume of the expansion unit 3. Further, the sound absorbing performance of the sound absorbing material 4 can be controlled by the average fiber diameter, thickness, density, and the like. In the drawings, reference numeral 1 denotes a duct, and 2 denotes a louver. Here, the reason why the air purifying material 5 is provided on the outer periphery of the sound absorbing material 4 is that the air purifying material 5 acts as an air layer behind the sound absorbing material layer, and exhibits the same performance as that of increasing the thickness of the sound absorbing material 4. It is because we expect to do it.
It is not preferable that the sound absorbing material 4 and the air purifying material 5 are made of a material mainly composed of polyester fiber because nylon fiber is expensive and raw material cost is high, and polypropylene fiber is inferior in material properties and heat compression. It is not preferable in that the mold easily collapses after molding. As the high melting point polyester fiber used for the nonwoven fabric raw material of the present invention, polyethylene terephthalate or a polyester having a component equivalent thereto is inexpensive and desirable. As the copolyester used in the heat-fusible fiber having a core-sheath structure, terephthalic acid, an acid component such as isophthalic acid, and a diol component such as ethylene glycol, propylene glycol, and diethylene glycol, or a lactone were copolymerized by ring opening. Copolyester and the like can be used. The same applies to a fully-fused binder fiber. As the polyester used for the core portion, polyethylene terephthalate or a polyester having a component equivalent thereto is inexpensive and desirable.
[0006]
(1) Composition of Sound Absorbing Material Layer The sound absorbing material 4 has a fineness of 1 to 20 denier composed of a core component mainly composed of polyethylene terephthalate and a low melting point elastic polyester sheath component having a melting point of 200 ° C. or less and a main copolymerization component of polyethylene terephthalate. The core-sheath type conjugate fiber may be composed of 70 to 10% by weight and 30 to 90% by weight of a high melting point fiber mainly composed of polyethylene terephthalate having a fineness of 20 denier or less. In this case, it is also possible to increase the fiber surface area and improve the sound absorbing performance by using fibers in which the cross-sectional shape of the high melting point fiber is changed from a normal round cross section to a W-shaped or Y-shaped cross section.
[0007]
(2) Constitution of Air Purifying Layer The air purifying material 5 has a high melting point fiber mainly composed of polyethylene terephthalate, and a low melting point having a melting point of 200 ° C. or less containing a core component mainly composed of polyethylene terephthalate and a main copolymerization component composed of polyethylene terephthalate. It is desirable that the core-sheath type composite fiber nonwoven fabric composed of an elastec polyester sheath component is used. In this case, a low melting point elastomer having a melting point of 200 ° C. or less comprising a core component mainly composed of polyethylene terephthalate and a main copolymerization component composed of polyethylene terephthalate having a fineness of 90 to 50% by weight and a fineness of 1 to 20 denier and a high melting point fiber having a fineness of 1 to 150 denier. It is desirable that the core-sheath type composite fiber composed of the tech polyester sheath component is constituted by 10 to 50% by weight. In order to reduce airflow resistance, the characteristics of the nonwoven fabric include:
・ Low density ・ The air flow path is provided in parallel with the nonwoven fabric laminating direction.
[0008]
(3) Configuration of Expansion Duct An expansion portion 3 whose volume is increased in the circumferential direction is installed in a part of the air flow path (duct 1). Desirably, it is ideally provided on the entire circumference of the duct 1. A mesh-shaped sound absorbing material holding member 6 is installed on the inner periphery of the sound absorbing material 4 (FIG. 2). Note that reference numeral 7 is a hole. Further, a louver 2 is installed on the inner surface of the duct 1 at the entrance of the extension 3 in order to forcibly introduce air into the extension 3. Depending on the angle of the louver 2 and the amount of protrusion of the louver 2 into the inside of the duct 1, the flow rate of the air passing through the extension 3 can be adjusted.
[0009]
【Example】
Each embodiment will be described below based on the above basic concept.
(Example 1)
<Sound absorbing material layer>
80% by weight of a high-melting fiber mainly composed of polyethylene terephthalate and a round cross-section fiber having a fineness of 10 deniers and a length of 52 mm, and a low-melting elastomer having a melting point of 130 ° C. containing a core component mainly composed of polyethylene terephthalate and a main copolymerization component of polyethylene terephthalate. 20% by weight of a core-sheath type composite fiber composed of a polyester sheath component and having a fineness of 2 denier and a length of 52 mm was mixed. The average density was 0.02 g / cm ³ . The mixed nonwoven fabric was subjected to blending, carding, cross-layering, needle punching, and heat treatment to obtain a raw material.
[0010]
<Air purifier layer>
80% by weight of a high-melting-point fiber mainly composed of polyethylene terephthalate and a circular cross-section fiber having a denier of 40 denier and 52 mm in length, and a low-melting point elastomer having a melting point of 130 ° C. containing a core component composed mainly of polyethylene terephthalate and a main copolymerization component composed of polyethylene terephthalate. 20% by weight of a core-sheath type composite fiber composed of a polyester sheath component and having a fineness of 2 denier and a length of 52 mm was mixed. The average density was 0.01 g / cm ³ . The mixed nonwoven fabric was subjected to blending, carding, cross-layering, needle punching, and heat treatment to obtain a raw material. The main fiber is kneaded with a silver-based inorganic antibacterial material.
[0011]
The sound absorbing material layer and the air cleaning layer are laminated, and the layers are bonded by heating and pressing to adjust the thickness. In this embodiment, the sound absorbing material layer and the air purifying layer are individually manufactured and finally laminated. However, if two cards and a cross layer machine are used, the sound absorbing material layer and the air purifying material layer are laminated. Can be obtained in a state.
The effect sound absorption performance was sufficiently secured, and the function of the air purifying material layer was also demonstrated. There was no problem such as scattering of fibers due to mixing of the binder fibers.
[0012]
(Example 2)
<Sound absorbing material layer>
80% by weight of a high-melting fiber mainly composed of polyethylene terephthalate and a round cross-section fiber having a denier of 6 deniers of 52 mm and a low-melting point elastomer having a melting point of 130 ° C. containing a core component composed mainly of polyethylene terephthalate and a main copolymerization component composed of polyethylene terephthalate. 20% by weight of a core-sheath type composite fiber composed of a polyester sheath component and having a fineness of 2 denier and a length of 52 mm was mixed. The average density was 0.02 g / cm ³ . The mixed nonwoven fabric was subjected to blending, carding, cross-layering, needle punching, and heat treatment to obtain a raw material.
[0013]
<Air purifier layer>
80% by weight of a high-melting-point fiber mainly composed of polyethylene terephthalate and a circular cross-section fiber having a denier of 40 denier and 52 mm in length, and a low-melting point elastomer having a melting point of 130 ° C. containing a core component composed mainly of polyethylene terephthalate and a main copolymerization component composed of polyethylene terephthalate. 20% by weight of a core-sheath type composite fiber composed of a polyester sheath component and having a fineness of 2 denier and a length of 52 mm was mixed. The average density was 0.01 g / cm ³ . The mixed nonwoven fabric was subjected to blending, carding, cross-layering, needle punching, and heat treatment to obtain a raw material. The main fiber is kneaded with a silver-based inorganic antibacterial material.
[0014]
The sound-absorbing material layer and the air-cleaning material layer are laminated, and these layers are bonded by heating and pressing to adjust the thickness. In this embodiment, the sound-absorbing material layer and the air-cleaning material layer are separately manufactured and finally laminated. However, if two cards and a cross-layer machine are used, the sound-absorbing material layer and the air-cleaning material layer are laminated. What can be obtained in the state of being the same as in (Example 1).
Since the effect average fiber diameter is smaller than that in (Example 1), the sound absorbing performance is improved. The function of the air cleaning layer was also exhibited, and there was no problem such as scattering of fibers due to mixing of binder fibers.
[0015]
(Example 3)
<Sound absorbing material layer>
80% by weight of a high-melting fiber mainly composed of polyethylene terephthalate and a circular cross-section fiber having a denier of 2 denier of 52 mm and a low-melting point elastomer having a melting point of 130 ° C. containing a core component composed mainly of polyethylene terephthalate and a main copolymerization component composed of polyethylene terephthalate. 20% by weight of a core-sheath type composite fiber composed of a polyester sheath component and having a fineness of 2 denier and a length of 52 mm was mixed. The average density was 0.02 g / cm ³ . The mixed nonwoven fabric was subjected to blending, carding, cross-layering, needle punching, and heat treatment to obtain a raw material.
[0016]
<Air purifier layer>
80% by weight of a high-melting-point fiber mainly composed of polyethylene terephthalate and a circular cross-section fiber having a denier of 40 denier and 52 mm in length, and a low-melting point elastomer having a melting point of 130 ° C. containing a core component composed mainly of polyethylene terephthalate and a main copolymerization component composed of polyethylene terephthalate. 20% by weight of a core-sheath type composite fiber composed of a polyester sheath component and having a fineness of 2 denier and a length of 52 mm was mixed. The average density was 0.01 g / cm ³ . The mixed nonwoven fabric was subjected to blending, carding, cross-layering, needle punching, and heat treatment to obtain a raw material. The main fiber is kneaded with a silver-based inorganic antibacterial material.
[0017]
The sound-absorbing material layer and the air-cleaning material layer are laminated, and these layers are bonded by heating and pressing to adjust the thickness. In this embodiment, the sound absorbing material layer and the air purifying material layer are individually manufactured and finally laminated. However, if two cards and a cross layer machine are used, the sound absorbing material layer and the air purifying layer are laminated. What can be obtained in a state is the same as in (Example 1).
Since the effect average fiber diameter is smaller than in (Example 1) and (Example 2), the sound absorbing performance is improved. The function of the air cleaning layer was also exhibited, and there was no problem such as scattering of fibers due to mixing of binder fibers.
[0018]
(Example 4)
<Sound absorbing material layer>
90% by weight of a 52-mm long fiber having a denier of 2 denier and a Y-shaped cross section, mainly composed of polyethylene terephthalate, and a core component mainly composed of polyethylene terephthalate and a melting point 130 mainly composed of polyethylene terephthalate and polyethylene terephthalate 10% by weight of a fiber having a denier of 2 denier and a length of 52 mm was mixed with a core-sheath type conjugate fiber composed of a low-melting-point elastic polyester polyester sheath component at ℃. The average density was 0.03 g / cm ³ . The mixed nonwoven fabric was subjected to blending, carding, cross-layering, needle punching, and heat treatment to obtain a raw material.
[0019]
<Air purifier layer>
80% by weight of a high-melting-point fiber mainly composed of polyethylene terephthalate and a circular cross-section fiber having a denier of 40 denier and 52 mm in length, and a low-melting point elastomer having a melting point of 130 ° C. containing a core component composed mainly of polyethylene terephthalate and a main copolymerization component composed of polyethylene terephthalate. 20% by weight of a core-sheath type composite fiber composed of a polyester sheath component and having a fineness of 2 denier and a length of 52 mm was mixed. The average density was 0.01 g / cm ³ . The mixed nonwoven fabric was subjected to blending, carding, cross-layering, needle punching, and heat treatment to obtain a raw material. The main fiber is kneaded with a silver-based inorganic antibacterial material.
[0020]
The sound-absorbing material layer and the air-cleaning material layer are laminated, and these layers are bonded by heating and pressing to adjust the thickness. In this embodiment, the sound-absorbing material layer and the air-cleaning material layer are separately manufactured and finally laminated. However, if two cards and a cross-layer machine are used, the sound-absorbing material layer and the air-cleaning material layer are laminated. What can be obtained in the state of being the same as in (Example 1).
Effect Y-shaped cross-section fibers are used, and the total surface area of the fibers is larger than that of (Example 3). Further, since the density is increased, the sound absorbing performance is improved as compared with the third embodiment. The function of the air cleaning layer was also exhibited, and there was no problem such as scattering of fibers due to mixing of binder fibers.
[0021]
(Example 5)
<Sound absorbing material layer>
A high melting point fiber mainly composed of polyethylene terephthalate, a 10-denier fine fiber having a round cross section having a length of 52 mm and a length of 52 mm is 80% by weight, and a low melting point elastomer having a melting point of 130 ° C. containing a core component mainly composed of polyethylene terephthalate and a main copolymerization component composed of polyethylene terephthalate. 20% by weight of a fiber having a denier of 2 denier and a length of 52 mm was mixed with a core-sheath type composite fiber composed of a tech polyester sheath component. The average density was 0.02 g / cm ³ . The mixed nonwoven fabric was subjected to blending, carding, cross-layering, needle punching, and heat treatment to obtain a raw material.
[0022]
<Air purifier layer>
90% by weight of a high-melting fiber mainly composed of polyethylene terephthalate and a round cross-section fiber having a denier of 100 denier and 52 mm length, 90% by weight, and a low-melting elastomer having a melting point of 130 ° C. containing a core component mainly composed of polyethylene terephthalate and a main copolymerization component of polyethylene terephthalate. 10% by weight of a core-sheath type conjugate fiber composed of a polyester sheath component and having a fineness of 2 denier and a length of 52 mm was mixed. The average density was 0.01 g / cm ³ . The mixed nonwoven fabric was subjected to blending, carding, cross-layering, needle punching, and heat treatment to obtain a raw material. The main fiber is kneaded with a silver-based inorganic antibacterial material.
[0023]
The sound-absorbing material layer and the air-cleaning material layer are laminated, and these layers are bonded by heating and pressing to adjust the thickness. In this embodiment, the sound-absorbing material layer and the air-cleaning material layer are separately manufactured and finally laminated. However, if two cards and a cross-layer machine are used, the sound-absorbing material layer and the air-cleaning material layer are laminated. What can be obtained in the state of being the same as in (Example 1).
The effect sound absorbing performance is at the same level as (Example 1). Since the average fiber of the air cleaning material layer is thickened, the airflow resistance is lower than that of (Example 1). There was no problem such as scattering of fibers due to mixing of the binder fibers.
[0024]
(Example 6)
<Sound absorbing material layer>
A high melting point fiber mainly composed of polyethylene terephthalate, a 10-denier fine fiber having a round cross section having a length of 52 mm and a length of 52 mm is 80% by weight, and a low melting point elastomer having a melting point of 130 ° C. containing a core component mainly composed of polyethylene terephthalate and a main copolymerization component composed of polyethylene terephthalate. 20% by weight of a fiber having a denier of 2 denier and a length of 52 mm was mixed with a core-sheath type composite fiber composed of a tech polyester sheath component. The average density was 0.02 g / cm ³ . The mixed nonwoven fabric was subjected to blending, carding, cross-layering, needle punching, and heat treatment to obtain a raw material.
[0025]
<Air purifier layer>
90% by weight of a high-melting fiber mainly composed of polyethylene terephthalate and a round cross-section fiber having a denier of 100 denier and 52 mm length, 90% by weight, and a low-melting elastomer having a melting point of 130 ° C. containing a core component mainly composed of polyethylene terephthalate and a main copolymerization component of polyethylene terephthalate. 10% by weight of a core-sheath type conjugate fiber composed of a polyester sheath component and having a fineness of 2 denier and a length of 52 mm was mixed. The average density was 0.005 g / cm ³ . The mixed nonwoven fabric was subjected to blending, carding, cross-layering, needle punching, and heat treatment to obtain a raw material. The main fiber is kneaded with a silver-based inorganic antibacterial material.
[0026]
The sound-absorbing material layer and the air-cleaning material layer are laminated, and these layers are bonded by heating and pressing to adjust the thickness. In this embodiment, the sound-absorbing material layer and the air-cleaning material layer are separately manufactured and finally laminated. However, if two cards and a cross-layer machine are used, the sound-absorbing material layer and the air-cleaning material layer are laminated. What can be obtained in the state of being the same as in (Example 1).
The effect sound absorbing performance is at the same level as (Example 1). Since the fiber density of the air purifying material layer is reduced and the average fiber is thickened, the airflow resistance is lower than that of (Example 5). There was no problem such as scattering of fibers due to mixing of the binder fibers.
[0027]
(Example 7)
In (Examples 1 to 6), the thickness ratio between the sound absorbing material layer and the air cleaning material layer is set to 50:50, but in this embodiment, the thickness of the air cleaning layer is increased to 20:80.
[0028]
<Sound absorbing material layer>
A high melting point fiber mainly composed of polyethylene terephthalate, a 10-denier fine fiber having a round cross section having a length of 52 mm and a length of 52 mm is 80% by weight, and a low melting point elastomer having a melting point of 130 ° C. containing a core component mainly composed of polyethylene terephthalate and a main copolymerization component composed of polyethylene terephthalate. 20% by weight of a fiber having a denier of 2 denier and a length of 52 mm was mixed with a core-sheath type composite fiber composed of a tech polyester sheath component. The average density was 0.02 g / cm ³ . The mixed nonwoven fabric was subjected to blending, carding, cross-layering, needle punching, and heat treatment to obtain a raw material.
[0029]
<Air purifier layer>
80% by weight of a high-melting-point fiber mainly composed of polyethylene terephthalate and a circular cross-section fiber having a denier of 40 denier and 52 mm in length, and a low-melting point elastomer having a melting point of 130 ° C. containing a core component composed mainly of polyethylene terephthalate and a main copolymerization component composed of polyethylene terephthalate. 20% by weight of a core-sheath type composite fiber composed of a polyester sheath component and having a fineness of 2 denier and a length of 52 mm was mixed. The average density was 0.01 g / cm ³ . The mixed nonwoven fabric was subjected to blending, carding, cross-layering, needle punching, and heat treatment to obtain a raw material. The main fiber is kneaded with a silver-based inorganic antibacterial material.
[0030]
The sound-absorbing material layer and the air-cleaning material layer are laminated, and these layers are bonded by heating and pressing to adjust the thickness. In this embodiment, the sound-absorbing material layer and the air-cleaning material layer are separately manufactured and finally laminated. However, if two cards and a cross-layer machine are used, the sound-absorbing material layer and the air-cleaning material layer are laminated. What can be obtained in the state of being the same as in (Example 1).
The effect sound absorption performance is shifted to a lower frequency side because the thickness of the air cleaning material layer is increased. Since the portion occupied by the air cleaning material layer has increased, the airflow resistance as a whole has also decreased.
[0031]
(Comparative Example 1)
<Sound absorbing material layer>
A high melting point fiber mainly composed of polyethylene terephthalate, having a denier of 50 denier and a round cross section of 52 mm length, 90% by weight, and a low melting point having a melting point of 130 ° C. containing a core component mainly composed of polyethylene terephthalate and a main copolymerization component composed of polyethylene terephthalate. 10% by weight of a fiber having a denier of 2 denier and a length of 52 mm was mixed with a core-sheath type composite fiber comprising an Elastec polyester sheath component. The average density was 0.02 g / cm ³ . The mixed nonwoven fabric was subjected to blending, carding, cross-layering, needle punching, and heat treatment to obtain a raw material.
[0032]
<Air purifier layer>
80% by weight of a high-melting-point fiber mainly composed of polyethylene terephthalate and a circular cross-section fiber having a denier of 40 denier and 52 mm in length, and a low-melting point elastomer having a melting point of 130 ° C. containing a core component composed mainly of polyethylene terephthalate and a main copolymerization component composed of polyethylene terephthalate. 20% by weight of a fiber having a fineness of 2 denier and a length of 52 mm was mixed with a core-sheath type composite fiber comprising a polyester sheath component. The average density was 0.01 g / cm ³ . The mixed nonwoven fabric was subjected to blending, carding, cross-layering, needle punching, and heat treatment to obtain a raw material. The main fiber is kneaded with a silver-based inorganic antibacterial material.
[0033]
The sound-absorbing material layer and the air-cleaning material layer are laminated, and these layers are bonded by heating and pressing to adjust the thickness. In this comparative example, the sound-absorbing material layer and the air-cleaning material layer were separately manufactured and finally laminated. However, when two cards and a cross-layer machine were used, the sound-absorbing material layer and the air-cleaning layer were laminated. What can be obtained in a state is the same as in (Example 1).
The desired sound absorbing effect could not be obtained because the average fiber diameter was large.
[0034]
(Comparative Example 2)
<Sound absorbing material layer>
98% by weight of a high-melting fiber composed mainly of polyethylene terephthalate and a round cross-section fiber having a fineness of 10 deniers and a length of 52 mm, 98% by weight, and a low-melting elastomer having a melting point of 130 ° C. containing a core component composed mainly of polyethylene terephthalate and a main copolymerized component composed of polyethylene terephthalate. 2% by weight of a fiber having a denier of 2 denier and a length of 52 mm was mixed with a core-sheath type composite fiber composed of a polyester sheath component. The average density was 0.02 g / cm ³ . The mixed nonwoven fabric was subjected to blending, carding, cross-layering, needle punching, and heat treatment to obtain a raw material.
[0035]
<Air purifier layer>
98% by weight of a high-melting-point fiber mainly composed of polyethylene terephthalate and a round cross-section fiber having a denier of 40 denier and 52 mm length, 98% by weight, and a low-melting point elastomer having a melting point of 130 ° C. containing a core component mainly composed of polyethylene terephthalate and a main copolymerization component of polyethylene terephthalate. 2% by weight of a fiber having a denier of 2 denier and a length of 52 mm was mixed with a core-sheath type composite fiber composed of a polyester sheath component. The average density was 0.01 g / cm ³ . The mixed nonwoven fabric was subjected to blending, carding, cross-layering, needle punching, and heat treatment to obtain a raw material. The main fiber is kneaded with a silver-based inorganic antibacterial material.
[0036]
The sound-absorbing material layer and the air-cleaning material layer are laminated, and these layers are bonded by heating and pressing to adjust the thickness. In this comparative example, the sound-absorbing material layer and the air-cleaning material layer are separately manufactured and finally laminated. However, if two cards and a cross-layer machine are used, the sound-absorbing material layer and the air-cleaning material layer are laminated. It can be obtained in a state of being.
Although effective sound absorbing performance was ensured and the function of the air cleaning layer was able to be exhibited, due to the low mixing ratio of the binder fibers, unfixed fibers were generated, and the problem of scattering of fibers occurred.
[0037]
【The invention's effect】
As described above, according to the present invention, an expansion part is provided in a part of an air flow path of an air conditioner, and a sound absorbing material is installed inside the expansion part, and at the same time, acts as an air layer behind the sound absorbing material on the outer periphery of the sound absorbing material. In addition, a deodorizing function, an antibacterial effect, or an air purifying material capable of trapping dust are installed. As a result, it is possible to reduce the noise of the air conditioner and at the same time to purify the air in the vehicle compartment.
[Brief description of the drawings]
FIG. 1 is a schematic configuration diagram of an embodiment of the present invention.
FIG. 2 is a diagram showing a sound absorbing material holding structure according to the embodiment of the present invention.
FIG. 3 is a schematic diagram showing a configuration of a conventional air conditioner.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Duct 2 Louver 3 Expansion part 4 Sound absorbing material 5 Air purifying material 6 Sound absorbing material holding material 7 Void

Claims (7)

A sound absorbing structure for a vehicle, wherein a part of an air flow path of a vehicle air conditioner is expanded, and a sound absorbing material and an air purifying material also serving as an air layer behind the sound absorbing material are installed in the expanded portion. 2. The vehicle sound absorbing structure according to claim 1, wherein said vehicle sound absorbing structure is provided with a sound absorbing material all around or partially around an air flow path. 2. The sound absorbing structure for an automobile according to claim 1, wherein said sound absorbing structure for an automobile is made of a fiber body mainly composed of polyethylene terephthalate. The sound absorbing structure for a vehicle according to claim 3, wherein the fibrous body mainly composed of polyethylene terephthalate is laminated in a horizontal direction with respect to the air flow path. The sound-absorbing material according to claim 1 is a core-sheath type having a fineness of 1 to 20 denier, comprising a core component mainly composed of polyethylene terephthalate and a low-melting-point elastic polyester sheath component having a melting point of 200 ° C. or less containing polyethylene terephthalate as a main copolymer component. A sound absorbing structure for an automobile, comprising a composite fiber and a high melting point fiber mainly composed of polyethylene terephthalate having a fineness of 20 denier or less. The air purifying material according to claim 1 has a high melting point fiber of 1 to 150 denier mainly composed of polyethylene terephthalate, a core component mainly composed of polyethylene terephthalate, and a low melting point having a melting point of 200 ° C. or less which is mainly composed of polyethylene terephthalate. A sound-absorbing structure for automobiles, comprising a core-sheath type composite fiber having a melting point elastic polyester polyester component and a fiber having a fineness of 1 to 20 denier. A sound absorbing structure for an automobile, wherein a material having an antibacterial action is carried or kneaded in the polyester fiber as a main fiber constituting the air purifying material according to claim 6.

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