JP2008281276A - Air conditioning duct, or component for air conditioning duct - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an air conditioning duct or a component for the air conditioning duct having both sound absorption function and waterproof function. <P>SOLUTION: This air conditioning duct comprises an outer coating layer 10 having non-permeability and waterproofness, an intermediate layer 20 having heat retaining property and sound absorption property, and an inner coating layer 30 constituted by a film or sheet having moisture penetration waterproofness. The substrate of the film or sheet is nonwoven fabric made of synthetic resin, synthetic resin film, cloth or paper group. Regarding its physical property, preferably, moisture penetration resistance is 0.20 m<SP>2</SP>*s*Pa/μg or lower, and the waterproofness is 8 kPa or higher. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an air conditioning duct or a component for an air conditioning duct.

As a conventional air-conditioning duct, Patent Document 1 discloses that “a metal foil 5 is bonded to the outer surface of a glass wool layer 4 formed in a cylindrical shape, and the inner surface of the glass wool layer 4 is bonded to a metal via an adhesive layer 3. "A duct made of glass wool for air conditioning provided with an anti-scattering layer 2 made of foil, synthetic resin film, woven fabric or non-woven fabric" (summary). According to the invention described in the patent document, even if air passes through the duct, the glass wool fiber does not scatter from the duct outlet, and is made of glass wool. ([0028]).
However, since the anti-scattering layer 2 such as a metal foil or a synthetic resin film is provided via the adhesive layer 3, the sound in the duct is blocked by the anti-scattering layer 2 or the adhesive layer 3, and the sound absorbing function by the glass wool layer is achieved. There is a problem that it cannot be performed well.
On the other hand, it is conceivable that the inner layer of breathable woven or non-woven cloth is provided on the inner surface of an intermediate layer such as glass wool without using an adhesive layer, so that the intermediate layer such as glass wool exhibits a sound absorbing function.
However, in this case, since the woven fabric / nonwoven fabric which is the inner coat layer has air permeability, the heat retaining property tends to be lowered. In addition, since the inner layer is not waterproof, condensed water that is likely to be generated when moisture-containing air flows flows into fibers such as glass wool, which is an intermediate layer, to reduce heat retention, There is a problem that the duct may be damaged due to the weight of the moisture, which may cause damage.

Japanese Patent Application Laid-Open No. 8-210584

  The present invention has been made in view of the above-described problems in the prior art, and an object thereof is to provide an air-conditioning duct or an air-conditioning duct component having both a sound absorbing function and a waterproof function.

The present invention has been made in order to solve the above-described problems, and has a non-breathable and waterproof outer cover layer, a heat retaining and sound absorbing intermediate layer, and a moisture-permeable waterproof film or sheet. An air-conditioning duct or an air-conditioning duct component comprising an inner coating layer constituted by
Here, the moisture-permeable waterproof property means a property that water vapor is transmitted but water (liquid) is not transmitted.
The air-conditioning duct part is a part other than the duct, which is connected to the duct disposed in the middle of the air-conditioning pipe as a part of the air flow path (including the vicinity of the outlet), like the air-conditioning duct. For example, a chamber / box for an air conditioner.
In the present invention, the film or sheet is preferably based on a synthetic resin nonwoven fabric, a synthetic resin film, a fabric or paper.
The physical properties of the film or sheet are preferably those having a moisture permeability resistance of 0.20 m ² · s · Pa / μg or less and a waterproof property of 8 kPa or more. Here, the moisture permeability resistance and waterproofness are values measured in accordance with JIS A 6111 (moisture permeable waterproof sheet).

According to the air-conditioning duct or the air-conditioning duct component according to the present invention, since the inner layer composed of a moisture-permeable and waterproof film or sheet is provided inside the intermediate layer, the sound absorption by the intermediate layer is exhibited well. In addition, the water-resistant inner layer prevents water from entering the intermediate layer having heat retaining properties and sound absorption properties, thereby avoiding deterioration and damage to the intermediate layer due to water content.
In addition, the film or sheet has a configuration in which a synthetic resin nonwoven fabric, a synthetic resin film, a fabric, or paper is used as a base material.
Further, the physical properties of the film or sheet exhibit a good moisture permeability function and waterproof function when the moisture permeability resistance is 0.20 m ² · s · Pa / μg or less and the waterproof property is 8 kPa or more. be able to.

  Embodiments of the present invention will be described with reference to the drawings. However, the present invention is not limited to the following embodiments, and various modifications and additions are possible within the scope of the gist of the present invention.

  FIG. 1 is a side view showing an air-conditioning duct 1 as an example of an embodiment of the present invention in a cross section on one side, FIGS. It is a figure which shows typically the test apparatus used for the performance evaluation test.

The air-conditioning duct 1 is configured as a flexible duct having a circular or elliptical cross section, and includes an outer cover layer 10 that forms an outermost layer, an intermediate layer 20 provided inside the outer cover layer 10, and an inner side of the intermediate layer 20. And an inner coating layer 30 provided on the inner surface.
The outer cover layer 10 is folded back to the inner surface side of the air conditioning duct 1 so as to cover the end surfaces of the intermediate layer 20 and the inner covering layer 30 at both ends of the air conditioning duct 1, and is fixed to the end by a stapler or the like (not shown). It is like that. The both ends of the air conditioning duct 1 are formed with small outer diameter portions for facilitating the joining of the ducts, but are not essential.
Reference numeral 40 is a reinforcing member for maintaining the tube shape of the duct, and is usually made of a wire material such as a galvanized steel wire wound in a spiral shape. The reinforcing member 40 is, for example, disposed between the intermediate layer 20 and the inner covering layer 30 and bonded to the inner covering layer 30. The engagement relationship with the layer 30 can be set as appropriate. For example, the belt-shaped inner coating layer 30 is spirally wound and overlapped and joined at the edge, and the reinforcing member is positioned in the overlapping portion to be joined so that the reinforcing member is covered with the inner coating layer. It may be.
When the outer cover layer 10, the intermediate layer 20 and the inner cover layer 30 are configured as flexible ducts, they are usually not bonded to each other in order to ensure flexibility (stretchability). Also good.

  The covering layer 10 has air permeability and waterproofness, and a composite film composed of a single layer or a plurality of layers based on a synthetic resin is used. For example, a thermoplastic resin film consisting of a single layer of polyethylene, polypropylene, polyester, polyamide, polyvinyl chloride, or the like, or a combination of these appropriately, or a composite in which aluminum is deposited on such a thermoplastic resin film Examples include a film and a film obtained by bonding an aluminum foil (usually 7 to 20 μm). The thickness is not particularly limited, but is usually about 0.01 to 0.1 mm.

The intermediate layer 20 has heat retaining properties and sound absorbing properties, and nonflammable inorganic fibrous materials such as glass wool, rock wool, and ceramic wool are used. In the case of glass wool, the density of the fibrous material is usually about 16 to 24 kg / m ³ , but is not limited thereto. Further, the thickness of the intermediate layer 20 made of the fibrous material is usually 15 to 30 mm, and preferably 20 to 25 mm in order to exhibit good heat retaining properties and sound absorption and avoid an increase in weight.

As the inner coat layer 30, a film or sheet having moisture permeability and waterproofness is used.
As for the physical properties of the film or sheet, the moisture permeability measured in accordance with JIS A 6111 (moisture permeable waterproof sheet) is 0.20 m ² · s · Pa / μg or less, and JIS A 6111 (moisture permeable waterproof). The waterproofness measured in accordance with the sheet is preferably 8 kPa or more. More preferably, moisture permeability is 0.13 to 0.10 m ² · s · Pa / μg and water resistance is in the range of 10 to 60 kPa from the viewpoint of achieving both sound absorption and waterproof properties in a balanced manner. .
Further, the air permeability of the film or sheet is preferably in the range of 0.1 to 50 cm ³ / cm ² · sec (measuring method: JIS L 1096). If the air permeability is zero, the sound absorption is reduced because no sound is absorbed.
The material or structure of the film or sheet having moisture permeability and waterproofness is not particularly limited as long as it has strength that can be used for an inner layer of an air conditioning duct or an air conditioning duct component. Various moisture permeable waterproof films or sheets can be used.
For example, in addition to a synthetic resin film having the above physical properties, a synthetic resin nonwoven fabric, fabric or paper as a base material, a coating with a synthetic resin applied thereto to form a moisture permeable waterproof film or sheet, or What laminated | stacked the moisture permeable waterproof film made from a synthetic resin to said base material suitably by the means is mentioned.
As a preferred example, a polyester nonwoven fabric having a basis weight of 30 to 50 g / m ² as a base material (reinforcing material) and a polyolefin moisture-permeable waterproof sheet bonded thereto (entire surface) It is not adhered to the substrate, but is adhered by a spraying method in which an adhesive is applied in a spider web form by spraying, or adhesive fiber is put on the base material and adhered by thermal bonding), and the thickness is The thing of 0.15-0.50 mm, More preferably, 0.20-0.35 mm is mentioned.

In place of the reinforcing member 40 made of a wire as described above, a configuration as shown in FIG. 2 or FIG. 3 may be employed.
The reinforcing member 45 shown in FIGS. 2 and 3 is formed of a continuous metal plate made of a metal such as a galvanized steel plate or iron having a substantially C-shaped cross section with the inner surface side of the duct as an opening. The film or sheet which is the inner coating layer 30 is fixed by being sandwiched. The reinforcing member 45 is formed with a thickness of about 0.3 to 1.5 mm and a width of about 4 to 7 mm, for example.
The inner covering layer 30 is formed by being spirally wound so that the edge portions of the film or sheet having a predetermined width are overlapped, and in the overlapping portion, the film of the inner covering layer 30 or in the C-shaped portion of the reinforcing member 45 While the sheet is sandwiched, and the line member 46 for preventing slipping is inserted into the C-shaped portion of the reinforcing member 45 from the inner surface side of the inner covering layer 30, the reinforcing member 45 and the inner covering layer 30 are integrated. Has been.
When the wire member 46 is inserted into the C-shaped portion and locked, the reinforcing member 45 firmly bites the inner covering layer 30, and the reinforcing member 45 is difficult to come off from the inner covering layer 30. The wire member 46 is usually made of an elastic metal material such as iron wire or galvanized steel wire, or nylon or other synthetic resin material. Its thickness is about 0.3 to 1.5 mm.

  In the example shown in FIG. 3, the inner coating layer 30 is formed by being spirally wound so as to overlap the edge portions of the film or sheet having a predetermined width as a whole. One edge portion of the sheet wraps around the line member 46 and is folded to the outer surface to form a folded portion 30a, and the other edge portion of the inner covering layer is superimposed on the folded portion 30a (outer surface). The inner cover layer 30 and the wire member 46 are sandwiched in the C-shaped portion of the reinforcing member 45 in a state where the edge portions are overlapped with each other. The inner coating layer 30 is integrated.

Although the air-conditioning duct 1 has been described above, the cross-sectional shape of the air-conditioning duct 1 is not limited to a circle or an ellipse, but can be a rectangular or other arbitrarily shaped tubular body. Can do.
In addition to air conditioning ducts, the present invention can also be applied to air conditioning duct parts such as chamber boxes. In the case of a chamber / box, the jacket layer can be formed of a metal material such as a steel plate that forms the housing. Since the structure of an intermediate | middle layer and an inner_cover_layer can employ | adopt the structure similar to the said air conditioning duct, the description is abbreviate | omitted.

In order to evaluate the sound absorption of the air-conditioning duct according to the present invention, a noise reduction performance evaluation test was performed.
The test method uses the test apparatus shown in FIG. 4 to generate noise (pink noise, 94.0 dB) as a sound source from a speaker and radiate it into an air conditioning duct as a test body through a reducer. The sound pressure level was measured with a sound level meter.

The configuration of the duct of the embodiment is as follows.
Inside diameter and length of duct (150mmφ ・ 100cm)
Outer layer: Polyethylene film (thickness 80μm)
Intermediate layer: glass wool (density 20 kg / m ³ , thickness 25 mm)
Inner layer: Polyester non-woven fabric (weight per unit area: 40 g / m ² ) and polyethylene-based moisture-permeable waterproof sheet (30 g / m ² ) adhered by spray method (total thickness: 0.25 mm)
The inner layer had a moisture permeability resistance of 0.10 m ² · s · Pa / μg and a waterproofness of 45 kPa.
Lamination mode of each layer: The inner layer is fixed to the inner layer using a reinforcing member as shown in FIG. The outer skin layer, the intermediate layer, and the inner coating layer were not adhered to each other, and each layer was fixed only at both ends.

The configuration of the duct of the comparative example is as follows.
Inside diameter and length of duct (150mmφ ・ 100cm)
Outer layer: Polyethylene film (thickness 80μm)
Intermediate layer: glass wool (density 20 kg / m ³ , thickness 25 mm)
Inner layer: Polyester film (thickness 0.02mm)
The inner layer had a moisture permeability resistance of 500 m ² · s · Pa / μg and a waterproofness of 100 kPa.
Lamination mode of each layer: same as in the example.

(result)
While the volume reduction in the example was 19.4 dB, the volume reduction in the comparative example was 14.0 dB, and the superiority of the sound absorption of the example was recognized.

It is a side view which shows the air-conditioning duct 1 which is an example of embodiment of this invention in a one-side cross section. FIG. 3 is an enlarged cross-sectional view showing a relationship between an inner coating layer 30 and a reinforcing member 45. FIG. 3 is an enlarged cross-sectional view showing a relationship between an inner coating layer 30 and a reinforcing member 45. It is a figure which shows typically the testing apparatus used for the muffling performance evaluation test.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Air-conditioning duct 10 Outer coating layer 20 Middle layer 30 Inner coating layer 40,45 Reinforcement member

Claims (3)

  Air-conditioning duct or air-conditioning duct comprising an outer layer having non-breathability and waterproofness, an intermediate layer having heat insulation and sound absorption, and an inner layer composed of a film or sheet having moisture permeability and waterproofness Parts.   The film or sheet is an air-conditioning duct or an air-conditioning duct component based on a non-woven fabric made of synthetic resin, a synthetic resin film, fabric or paper. The air-conditioning duct or air-conditioning duct component according to claim 1 or 2, wherein the physical properties of the film or sheet are a moisture permeability resistance of 0.20 m ² · s · Pa / μg or less and a waterproof property of 8 kPa or more. .

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