JP3496761B2 - Soundproofing material for air conditioner outdoor unit - Google Patents

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to an air conditioner (hereinafter referred to as “air conditioner”). Related to soundproofing materials used for outdoor units.

[0002]

2. Description of the Related Art Air conditioners are widely used both for home use and for business use, but most of them use an air compressor as an outdoor unit, so that a large noise is generated from the outdoor unit during operation of the air conditioner.

Therefore, measures are taken to obtain a soundproof effect by covering the compressor of the outdoor unit with a soundproof material.

For example, Japanese Patent Publication No. 6-112 by the present applicant.
Japanese Patent Publication No. 6 discloses a soundproof material having a three-layer structure of sound absorbing material / sound insulating material / sound absorbing material as a sound insulating material for an air conditioner (outdoor unit).

According to the structure of the above invention, the sound absorbing material is made of a fibrous material, and the sound insulating material is made of a rubber or asphalt sheet material. Thus, the sound absorbing and sound insulating effects are obtained.

However, in recent years, as environmental problems have been attracting attention, the recyclability of waste materials has become an important issue, and even air conditioners that are discarded after their useful lives have to be able to easily recycle the materials used. There is. In the case of the soundproof material as described above, since two different materials are used, it is necessary to separate the sound absorbing material and the sound insulating material for recycling, but this is difficult.

[Problems to be Solved by the Invention]

Therefore, there is a demand for a soundproofing material which is made of the same kind of material and has both sound absorbing performance and sound insulating property, and which has a performance equal to or higher than that of the conventional soundproofing material and yet is easily recyclable. Is.

Therefore, the first invention discloses a soundproof material in which a high-density felt is used in place of a conventional rubber-based or asphalt-based sound-insulating material, and a sound-absorbing material is laminated and integrated. Therefore, the second invention discloses a soundproof material having a three-layer structure in which felt having a higher sound absorbing effect is laminated and integrated on the outside of the high-density felt.

Further, the third invention discloses a soundproof material having a higher recyclability by using a felt selected from a thermoplastic felt and a needle felt.

[0010]

[Means for Solving the Problems] In order to solve the above problems, the present inventors have earnestly studied, and as a result, by using a felt of a specific density in place of the conventional sound insulating material, the sound insulating effect is improved, and the sound absorbing effect is improved. It has been found that the effect is also manifested, and a soundproof material that can be easily recycled can be realized by laminating and integrating felt that becomes a sound absorbing layer, and the gist of the present invention lies below. .

A soundproofing material for an outer panel of an air conditioner outdoor unit,
(1) Density 10-1 from the air conditioner outdoor unit to the inside
50 kg / m ³ low density felt, (2) the low density felt
The density difference is at least 140 kg / m ³ or more,
Moreover , a soundproof material for an outdoor unit of an air conditioner, which is characterized in that a high-density felt having a density of 150 to 2000 kg / m ³ is integrally laminated. It is a soundproof material for the outside plate of the air conditioner outdoor unit. (1) Density 10
Low density felt ~150kg / m ^3, (2) the low density Fe
The density difference is at least 140 kg / m ³ or more.
Ri, moreover density 150~2000kg / m ³ dense felt, (3) Density 10~150kg / m air conditioner outdoor machine soundproofing material, characterized by comprising integrally laminated in this order low density felt ^3. The above-mentioned is characterized in that a felt selected from a thermoplastic felt and a needle felt is used .
Soundproof material for outdoor unit of air conditioner described in any of the above. The details will be described below.

The felt forming the sound absorbing layer and the high density felt forming the sound insulating layer in the present invention can be manufactured by using the same raw material. That is,
Natural fibers such as wool, wool, and cotton, as well as various types of chemical fibers, etc., which have already been used for clothing, interior materials, etc., and have been made into cloth, and then re-fibred using a defibrating machine. .

When a raw material is prepared by mixing a binder made of a thermoplastic resin, the felt produced is a thermoplastic felt. Further, when the fibers are entangled with each other by repeatedly piercing the fibers with a large number of hook-shaped needles = needle without using a binder, the felt that can be formed is a needle felt. Both felts are suitable for recycling.

However, although a felt using a thermosetting resin such as a phenol resin as a binder is generally called a resin felt, this resin felt is not suitable for recycling, so it is desirable to avoid using it.

The density of the felt forming the sound absorbing layer is preferably in the range of 10 to 150 kg / m ³ .
When the density is less than 10 kg / m ³ , the sound absorbing effect is reduced,
If the density exceeds 150 kg / m ³ , the weight of the soundproofing material becomes too large. In the present invention, this felt is called "low density felt" for convenience.

The density of the felt forming the sound insulation layer is preferably in the range of 150 to 2000 kg / m ³ . 1
If the density is less than 50 kg / m ³ , the sound insulation effect does not appear,
If the density is more than 2000 kg / m ³ , the sound absorbing effect and the necessary sound absorbing effect cannot be obtained. In the present invention,
This felt is called "high density felt" for convenience.

In order to adjust the felt to have a density within the above specific range, the following method can be adopted. That is, if it is a needle felt original fabric, a thermoplastic resin such as PET (polyethylene terephthalate) or polyethylene is evenly dispersed as a binder on the original fabric, and if it is a thermoplastic felt, the original fabric is directly processed by a heating device such as a hot plate. After preheating the felt, it is passed between two rollers, the spacing of which is adjusted to a specific density, or by press molding with a press molding machine that adjusts the vertical die spacing and pressure when descending. A high density felt can be obtained by compressing the raw material of the felt to a thickness which is a fraction of the original thickness by a method such as. The low-density felt can also be compression-molded as described above, if necessary.

The low-density felt, the high-density felt, and the felt which becomes the outer sound absorbing layer are laminated and integrated by a conventionally known method. That is, it is integrated with an adhesive or staple. However, when an adhesive is used, if the adhesive is applied to the entire surface, the air flow is obstructed, and the sound absorbing effect is significantly deteriorated. Therefore, methods such as partial adhesion and spot adhesion are preferable.

The integrated soundproof material is applied to the inside of the outer plate of the outdoor unit of the air conditioner. At this time, it is necessary to apply (1) low-density felt that forms the sound absorbing layer, and then (2) high-density felt on the side that contacts the outer plate. An effective sound absorbing effect cannot be obtained unless the low-density felt is placed on the side in contact with the outer plate. Also, if necessary, a low-density felt is further laminated on the outside of the high-density felt to form a three-layer structure that is integrated as a whole, so that the sound generated by the vibration of the internal components of the air conditioner outdoor unit can be absorbed. Therefore, it is expected that the soundproofing effect will be further improved.

There is no particular limitation to the method of applying the integrated soundproofing material to the inside of the outer plate of the air conditioner outdoor unit. , A method in which a metal fitting capable of sandwiching a soundproof material is attached in advance, and the soundproof material is sandwiched and fixed to the metal fitting. Alternatively, a double-sided tape is attached in advance at a number of important points on the surface of the low-density felt of the soundproofing material, the release paper of the tape is peeled off at the time of construction, and it is attached to the inside of the outside plate of the air conditioner outdoor unit. Alternatively, the integrated soundproof material is processed into a cylindrical shape having substantially the same size as the inner circumference of the outer plate of the outdoor unit of the air conditioner, and the soundproof material is inserted into the outer plate portion of the outdoor unit of the air conditioner. And the like.
However, as a matter of course, the soundproof material should not be installed on the fan part of the outdoor unit of the air conditioner and the part where the fan part faces the outside.

The felt used in the present invention is preferably a flame-retardant felt. This is to prevent the spark from catching the felt and causing a fire when a spark should occur inside the outdoor unit of the air conditioner. In order to make the flame-retardant felt, there are methods of flame-retarding the fiber, using only the flame-retardant fiber, and the like.

[0022]

BEST MODE FOR CARRYING OUT THE INVENTION In order to provide an understanding of the present invention, examples will be described below. Needless to say, the present invention is not limited to the examples below.

[0023]

Example 1 A low-density felt having a density of 10 kg / m ³ was obtained from a needle felt raw fabric manufactured by needle punching mainly from a fiber raw material obtained by defibrating chemical fibers. Similarly, a high-density felt having a density of 150 kg / m ³ was obtained. The high-density felt having a density of 150 kg / m ³ was subjected to flame-retardant processing, and the above-mentioned two sheets of felt were superposed and bonded to each other with an adhesive to integrate them. The low-density felt of the felt was sandwiched and fixed to hook-shaped metal fittings provided in advance at the four inner corners of the outside plate of the air conditioner so that the felt had a low contact with the inside of the outside plate of the air conditioner outdoor unit.

[0024]

Example 2 A low-density felt having a density of 50 kg / m ³ was obtained from a needle felt raw fabric manufactured by needle punching mainly from a fiber raw material obtained by defibrating chemical fibers. Similarly, a high-density felt having a density of 1000 kg / m ³ was obtained. The high-density felt having a density of 1000 kg / m ³ was subjected to flame-retardant processing, and the above-mentioned two sheets of felt were overlaid and bonded to each other with an adhesive to integrate them. The low density felt of the felt is in contact with the inside of the air conditioner outdoor unit outer plate,
It was fixed by sandwiching it in the hook-shaped metal fittings that were previously installed at the four inner corners of the outside plate of the air conditioner outdoor unit.

[0025]

[Example 3] A low-density felt having a density of 150 kg / m ³ was obtained from a needle felt raw fabric produced by needle punching mainly from a fiber raw material obtained by defibrating chemical fibers. Similarly, a high-density felt having a density of 2000 kg / m ³ was obtained. The high-density felt having a density of 2000 kg / m ³ was subjected to flame-retardant processing, the above two sheets of felt were overlaid, and the important points were bonded by pressure-sensitive adhesive to be integrated. The low-density felt of the felt was sandwiched and fixed to hook-shaped metal fittings provided in advance at the four inner corners of the outside plate of the air conditioner so that the felt had a low contact with the inside of the outside plate of the air conditioner outdoor unit.

[0026]

[Example 4] Two low-density felts having a density of 150 kg / m ³ were obtained from a needle felt raw fabric manufactured by needle punching mainly from a fiber raw material obtained by defibrating chemical fibers. Similarly, a high-density felt having a density of 2000 kg / m ³ was obtained. One of the low-density felts with a density of 150 kg / m ³ was subjected to flame-retardant processing, and the above three felts were superposed in the order of low-density felt / high-density felt / flame-retardant low-density felt, The key points of the superposed surfaces were bonded with a pressure sensitive adhesive to integrate the three layers. The low-density felt of the felt was sandwiched and fixed to hook-shaped metal fittings provided in advance at the four inner corners of the outside plate of the air conditioner so that the felt had a low contact with the inside of the outside plate of the air conditioner outdoor unit.

[0027]

[Test Method] A microphone was installed 1 m from the front of an outdoor unit of a home air conditioner on which the soundproof material of Examples 1 to 4 was installed, and the noise generated during operation of the air conditioner was measured by a sound level meter. For comparison, even in a state in which the soundproof material of the present invention is removed from the inside of the outdoor unit outer plate of each example,
The same measurement was performed.

[0028]

[Results] The soundproofing materials of Examples 1 to 4 were able to reduce the noise generated from the outdoor unit during operation of the air conditioner by 8 dB to 15 dB as compared to when the soundproofing material was not installed.

[0029]

INDUSTRIAL APPLICABILITY The soundproofing material according to the present invention has a soundproofing effect comparable to that of the conventional soundproofing material using a combination of a rubber-based sound-insulating sheet and a felt sound-absorbing material, and is effectively an air conditioner outdoor unit. Noise from can be reduced. Further, since the soundproof material according to the present invention is composed of the same material made of felt, it has high recyclability and is easy to recycle, and thus is a soundproof material adapted to environmental problems.

─────────────────────────────────────────────────── ─── Continuation of the front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) F24F 5/00 B32B 5/26 G10K 11/16 G10K 11/162

Claims (3)

(57) [Claims] 1. A soundproof material for an outer panel of an air conditioner outdoor unit, comprising:
(1) Density 10-1 from the air conditioner outdoor unit to the inside
50 kg / m ³ low density felt, (2) the low density felt
The density difference is at least 140 kg / m ³ or more,
Moreover , a soundproof material for an outdoor unit of an air conditioner, which is characterized in that a high-density felt having a density of 150 to 2000 kg / m ³ is integrally laminated. 2. A soundproof material for an outer panel of an air conditioner outdoor unit, comprising:
(1) Density 10-1 from the air conditioner outdoor unit to the inside
50 kg / m ³ low density felt, (2) the low density felt
The density difference is at least 140 kg / m ³ or more,
Moreover density 150~2000kg / m ³ dense felt, (3) Density 10~150kg / m air conditioner outdoor machine soundproofing material, characterized by comprising integrally laminated in this order low density felt ^3. 3. A felt selected from a thermoplastic felt and a needle felt is used.
Or air conditioner outdoor machine soundproofing material according to any one of claims 2.