JP3260318B2 - Duct hose - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flexible duct hose which can be bent freely, and more particularly to a duct hose excellent in heat insulation and sound deadening for transferring gas for cooling and heating.

[0002]

2. Description of the Related Art Conventionally, as a duct hose of this kind,
For example, a heat insulating sound deadening duct described in JP-A-9-89357 is known. That is, the heat insulation sound deadening duct has a basic structure in which an inner surface layer, an open cell layer, an intermediate sheet layer, a closed cell layer, and an outer surface layer are sequentially formed and laminated individually from the inside.

[0003]

However, in the above-mentioned heat-insulating silencing duct, in addition to the fibrous band and the resin reinforcing band as the material constituting the inner surface layer, an open-cell foamed resin band forming an open-cell layer, A large number of strips are required, such as a resin sheet strip forming an intermediate sheet layer, a closed cell foamed resin strip forming a closed cell layer, and a resin sheet strip forming an outer surface layer. Must be successively laminated at the same pitch and spirally wound.As a result, a device for guiding each strip on the hose forming shaft is required, and the pitch adjustment work is troublesome. There is also the complexity of having to manage the stock status of each strip, and there is a limit in achieving the desired weight reduction in handling such as duct piping work.

Accordingly, an object of the present invention is to realize a lightweight and heat-insulating duct hose that can be freely formed into a pipe and that can be formed in a long shape, and to facilitate the forming operation.

[0005]

In order to solve the above-mentioned problems, the present invention has the following arrangement.

(1) A hose in which a sound-absorbing and heat-insulating layer is constituted by a soft first foamed resin layer and a soft second foamed resin layer laminated on the outside thereof, wherein the first foamed resin layer is formed on an inner surface. An open-cell foamed resin tape laminated with a breathable coating is spirally wound with the adjacent side edges abutting against each other, and the side edges of the adjacent foamed resin tape are bonded to the inner peripheral surface between the side edges. The second foamed resin layer is formed by being connected and integrated by thermal fusion with a resin-made inner reinforcing band wound on the second side, and the second foamed resin layer is formed by adhering a closed-cell foamed resin tape having an airtight coating laminated on the outer surface. The edges are abutted and spirally wound, and the side edges of the adjacent foamed resin tape are joined together by thermal fusion with a resin reinforcement body wound over the outer peripheral surface between the side edges. It is characterized by being formed Duct hose that.

(2) The first foamed resin layer is formed by spirally winding an open-cell foamed resin tape having an air-permeable coating on the inner surface and a resin film laminated on the outer surface with the adjacent side edges abutting each other. , Formed by connecting and integrating the side edges of adjacent foamed resin tapes by heat fusion with a resin inner surface reinforcing band and an intermediate reinforcing band wound over the inner peripheral surface and the outer peripheral surface between the side edges. The duct hose according to (1) above.

(3) The above (1) or (2), wherein the auxiliary reinforcing band made of resin is spirally wound and fixed between the pitches of the inner surface reinforcing band fixed to the inner peripheral surface of the first foamed resin layer. Duct hose.

The duct hose according to the first aspect of the present invention has a first foamed resin tape in which an air-permeable coating is laminated on the inner surface of an open-cell foamed resin layer, and an air-tight coating on the outer surface of a closed-cell foamed resin layer. The sound absorbing and heat insulating layer of the hose can be formed simply by spirally winding the foamed resin tape of No. 2 individually and connecting and integrating the side edges of each tape with a resin spiral for shape retention and reinforcement of the hose, Apart from these, there is no need for a member such as a fibrous band or a synthetic resin tape for forming the inner surface layer or the outer surface layer, and each film to be laminated on the foamed resin layer can have a significantly thinner thickness. .

As the open-cell foamed resin forming the first foamed resin tape, a material having excellent sound absorbing properties, for example, a foamed resin such as polyurethane, polyethylene (PE), EVA or the like is used. Polyurethane foam is used, and as the closed-cell foamed resin forming the second foamed resin tape, a material having excellent heat insulation properties, for example, a foamed resin such as PE or EVA is preferably used.
A soft PE foam is used.

The air-permeable coating laminated on the inner surface of the first foamed resin tape allows fluid to communicate with the open-cell foamed resin layer so as to mainly exhibit sound absorbing properties, and at the same time, prevents damage and deterioration of the foamed resin layer. Plays the role of protective film, and
The inner surface of the duct is formed smooth to reduce the resistance of the fluid, and its thickness is extremely thin and very light. As the air-permeable coating, a fiber material such as a woven fabric and a non-woven fabric is used, and polyester, nylon, polypropylene (PP)
And the like are preferred.

On the other hand, the airtight coating laminated on the outer surface of the second foamed resin tape imparts airtightness to the duct to surely prevent leakage of the fluid, and a resin reinforcing body wound around the outer peripheral surface of the duct has a heat resistance. It is made to be able to be fused, and its thickness is very thin and very light, like the breathable film. As the airtight coating, a resin film such as PE, EVA, or PP is preferable.

[0013] In the first foamed resin tape composed of the open-cell foamed resin layer and the air-permeable coating, the adjacent side edges of the first foamed resin tape are simultaneously spiraled over the inner peripheral surface between the side edges. The inner reinforcing band made of resin to be wound and adhered and the side edges are joined to each other through thermal fusion, and the joining of the first foamed resin tapes spirally wound in a butt shape is performed. Can be easily performed without any trouble.

Similarly, in the second foamed resin tape composed of the closed-cell foamed resin layer and the hermetic coating, the adjacent side edges are simultaneously spiraled over the outer peripheral surface between the side edges. Will be joined to each other through thermal fusion between the resin reinforcing body and each side edge to be wound and attached to each other, and the joining of the second foamed resin tapes spirally wound in a butt shape, It can be easily performed without any trouble.

According to a second aspect of the present invention, in the duct hose, a resin film made of the same material as the hermetic coating is laminated on the outer surface of the first foamed resin tape, and the resin is stretched over the outer peripheral surface between the side edges. The first reinforcing resin tape is formed by spirally winding an intermediate reinforcing band made of a resin and attaching to the resin film to further strengthen the bonding between the first foamed resin tapes.
At the same time, the laminated resin film acts as an intermediate partition film of the sound-absorbing heat-insulating layer without using a resin tape for forming the intermediate layer as a separate member, thereby improving the heat insulating property.

In the duct hose according to the third aspect, wrinkles and irregularities are prevented from being formed on the air-permeable coating on the inner surface by the auxiliary reinforcing band made of resin which is thermally fused to the first foamed resin layer between the pitches of the inner surface reinforcing band. In addition, the inner surface of the hose can be kept substantially smooth.

Each of the above-mentioned resin reinforcing member, inner surface reinforcing band, intermediate reinforcing band, and auxiliary reinforcing band may be any resin material having high rigidity that can be heat-fused with an airtight coating or a gas permeable coating. Can be selected as a lightweight and preferred material.

[0018]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a duct hose 1 according to the present invention, which is formed by laminating a first foamed resin layer 2 and a second foamed resin layer 3.

The first foamed resin layer 2 comprises an open-cell foamed resin layer 4 made of a flexible polyurethane foam and a breathable coating 5 made of a nonwoven fabric made of PP fiber laminated on the inner surface thereof.
And the first foamed resin tape TA (see FIG. 2)
Is formed by spirally winding with its adjacent side edges abutting each other, and spirally winding a hard PP inner surface reinforcing band 7 on the inner surface of the gas permeable coating 5 forming the inner peripheral surface. The shape is reinforced by heat fusion, and is integrated with the air permeable coating 5 by heat fusion.

The first foamed resin layer 2 comprises a preformed foamed resin tape TA and an inner surface reinforcing band 7 immediately after extrusion molding.
Are simultaneously wound spirally around a hose forming shaft (not shown), and the foamed resin tape TA is wound so that adjacent side edges thereof are almost in contact with each other. Attaching to the inner surface of the air-permeable coating 5 while straddling, each side edge is thermally fused to the inner surface reinforcing band 7 without directly joining the adjacent side edges of the foamed resin tape TA to themselves. It is formed by joining and integrating via a.

The second foamed resin layer 3 is provided on the outside of the first foamed resin layer 2 with a closed cell foamed resin layer 10 made of a soft PE foam and an airtight coating made of a PP resin film laminated on the outer surface thereof. 11 is formed by spirally winding a second foamed resin tape TB (see FIG. 3) formed with the airtight coating 11 with its adjacent side edges abutting each other and forming an outer peripheral surface thereof. A hard PP resin reinforcing body 12 is spirally wound around the outer surface and is integrated by heat fusion.

The second foamed resin layer 3 is formed of a foamed resin tape TB formed in advance and a resin reinforcing body 1 immediately after extrusion molding.
2 at the same time in a spiral shape, and the foamed resin tape TB is wound so that adjacent side edges thereof are almost in contact with each other. Affixed to the outer surface of the coating 11 to form a foamed resin tape T
B is formed by joining and integrating the side edges adjacent to each other through thermal fusion with the resin reinforcing body 12 without directly joining the adjacent side edges.

FIG. 4 is a partially enlarged cross-sectional view showing another embodiment, in which a first foamed resin layer 2 is an open-cell foamed resin layer 4 made of a flexible polyurethane foam, and a nonwoven fabric made of PP fiber laminated on the inner surface thereof. A first foamed resin tape TC (see FIG. 5) formed of a breathable film 5 made of PP and a resin film 6 made of PP laminated on the outer surface thereof has a spiral shape with its adjacent side edges abutting each other. The inner surface of the breathable film 5 is formed of a hard PP inner reinforcing band 7 and the outer surface of the resin film 6 is formed of a hard PP intermediate reinforcing band 8.
Is spirally wound and heat-fused to shape-reinforce and a PP auxiliary reinforcing band 9 having a smaller cross-sectional area is spirally wound between the adjacent inner surface reinforcing bands 7, 7 to provide ventilation. It is formed by heat-sealing and integrally forming the conductive film 5.

In the above-described embodiment, the nonwoven fabric laminated as the air permeable coating 5 has a basis weight of 50 g / m 2.
^{2. It} is preferable to use a resin film having a thickness of about 0.02 mm to be laminated as the airtight coating 11 or the like.

[0025]

As described above, according to the present invention, a duct hose having a sound-absorbing and heat-insulating layer is light in weight and easy to handle in transportation and piping work by minimizing the number of constituent parts, and is formed by molding. Work can also be performed easily. Moreover, since it has both good heat insulating properties and good sound absorbing properties and low flow resistance, it is possible to provide a duct hose suitable as a heat insulating and silencing duct for air-conditioning and air supply in general houses.

[Brief description of the drawings]

FIG. 1 is a partially sectional front view of a duct hose of the present invention.

FIG. 2 is a perspective view of an open-cell foamed resin tape.

FIG. 3 is a perspective view of a closed-cell foamed resin tape.

FIG. 4 is a partially enlarged cross-sectional view showing another embodiment.

FIG. 5 is a perspective view of another example of the open-cell foamed resin tape.

[Explanation of symbols]

 1 Duct hose 2 First foamed resin layer 3 Second foamed resin layer 4 Open-cell foamed resin layer 5 Breathable film 6 Resin film 7 Inner surface reinforcement band 8 Intermediate reinforcement band 9 Auxiliary reinforcement band 10 Closed-cell foamed resin layer 11 Airtight film 12 Resin reinforcement TA foamed resin tape TB foamed resin tape TC foamed resin tape

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor, Hitoshi Kodama, 6th, Tanyo, Kakegawa-shi, Shizuoka Prefecture Inside the Shigeruoka Plant (72) Inventor Seiji Hattori 6th, Tanyo, Kakegawa-shi, Shizuoka Prefecture, Japan Inside the factory (72) Inventor Yoshiki Yoshitomi, 6 Tanyo, Kakegawa-shi, Shizuoka Pref. Inside the Shigeruoka factory (72) Inventor Masataka Morikawa 6th, Tanyo, Kakegawa-shi, Shizuoka pref.Shizuoka factory (56) Reference Reference JP-A-9-89357 (JP, A) JP-A-8-219335 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) F16L 11/08 F16L 55/02 F24F 13 / 02

Claims (3)

(57) [Claims] 1. A hose comprising a sound-absorbing and heat-insulating layer comprising a soft first foamed resin layer and a soft second foamed resin layer laminated on the outside thereof, wherein the first foamed resin layer has a vent on its inner surface. The open-cell foamed resin tape laminated with the functional coating is spirally wound with the adjacent side edges abutting against each other, and the side edges of the adjacent foamed resin tape are placed on the inner peripheral surface between the side edges. The second foamed resin layer is formed by being connected and integrated by heat fusion with a resin-made inner reinforcing band wound over the bridge, and the second foamed resin layer is formed by laminating a closed-cell foamed resin tape having an airtight coating laminated on the outer surface. While abutting each other and spirally winding, the side edges of adjacent foamed resin tapes are connected and integrated by heat fusion with a resin reinforcing body wound over the outer peripheral surface between the side edges. It is characterized by being formed Kutohosu. 2. A first foamed resin layer having a gas-permeable coating on an inner surface thereof,
An open-cell foamed resin tape in which a resin film is laminated on the outer surface is spirally wound with the adjacent side edges abutting against each other, and the side edges of the adjacent foamed resin tapes are surrounded by an inner periphery between the side edges. 2. The duct hose according to claim 1, wherein the duct hose is integrally formed by being thermally fused with an inner reinforcing band and an intermediate reinforcing band made of resin wound over the surface and the outer peripheral surface. 3. 3. The duct hose according to claim 1, wherein an auxiliary reinforcing band made of resin is spirally wound and fixed between the pitches of the inner surface reinforcing band fixed to the inner peripheral surface of the first foamed resin layer.