JPH09166276A - Duct - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an air conditioner duct excellent in heat resistance, dewing resistance, and sound absorbing property by forming a pipe body with a resin film or sheet with fiber layer, a continuous bubble resin layer, and reinforcing bodies, positioning the fiber layer on the outside of the pipe, and forming the reinforcing bodies spirally or in ring shape. SOLUTION: A duct used as a heat insulated pipe for air conditioner piping is formed by binding and fusing reinforcing bodies 4 in an overlapped part 5 and winding it spirally, using a resin film or sheet with fiber layer and a band body 3 of a fixed width on which a continuous bubble resin layer is laminated beforehand. Also, in a bellows structure, its bottom part form is provided by pressing the part between the reinforcing bodies 4 while they are heated by disk rollers in parallel with the reinforcing bodies 4. Then the crest part and bottom part of the bellows structure may be the crest part by pushing up the part between the reinforcing bodies 4 from the inner surface of a pipe in parallel to the reinforcing bodies 4 while they are heated by the disk rollers. As a suitable fiber layer, unwoven cloth can be cited and, for example, needle punch unwoven cloth is used.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is a duct that improves the efficiency of heat insulation and dew condensation prevention in air-conditioning piping, reduces the space of the duct, and allows easy cutting and bending.
Furthermore, the present invention relates to a duct which has a sound absorbing property and can attenuate fan sound and motor sound propagating in the duct when a material having a sound absorbing property is used for the foam resin layer.

[0002]

2. Description of the Related Art Conventionally, as insulation pipes in air-conditioning pipes, glass wool laminated with aluminum foil is mainly wound on metal pipes and pressed with a turtle net, or
A straight tube made of glass wool solidified with a resin binder, with an aluminum foil attached to the surface. However, since these are not flexible, a flexible duct made of glass wool is used at the site where flexibility is required for the purpose of improving the efficiency of construction (Jitsuko Sho 51-37214).
No. 59-122480).

[0003]

However, when glass wool is wound around the metal pipe, sound absorbing performance cannot be expected at all, and the heat insulation work needs to be performed by a specialized company at a later date, which requires too much labor. The construction period was also long. In response to these problems, the duct in which glass wool is hardened with a resin binder has enabled sound absorption performance and shortened construction period, but since it is a hardened duct, it has no flexibility,
With complicated piping, it was necessary to construct the pipes while connecting them with various types of elbows. In addition, actual public Sho 51-37214
In the flexible duct using glass wool disclosed in Japanese Utility Model Publication No. 59-122480, the glass wool touches the hand and has a problem in workability when cut to an arbitrary length. On the other hand, Japanese Patent Laid-Open No. 5-149497 proposes a heat insulating hose provided with a fiber layer on the outer surface for drainage, but since it is for drainage purpose, it has a sound absorbing performance for attenuating fan noise and motor noise propagating in the duct. It cannot be used without consideration. Then
The present invention has been made to solve these problems, has a heat insulating property, a dew condensation preventing property and a sound absorbing property, is flexible so that it can be used as both straight piping and curved piping, and can be arbitrarily cut. Even if it aims at providing the duct which does not have a problem in workability.

[0004]

Means for Solving the Problems The above object comprises a tubular body composed of a resin film or sheet having a fiber layer, an open-cell resin layer and a reinforcing member, wherein the fiber layer is located on the outer surface of the pipe, This is achieved by providing a duct in which the body is spirally or ring-shaped.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described with reference to the drawings. FIG. 1 is a perspective view of a band-shaped body 3 obtained by slitting a laminate of a resin film or sheet 7 having one fiber layer used in the present invention and an open-cell resin layer 2 into a certain width. FIG. 2 is a plan view showing a partial cross section of a duct which is an example of the present invention. The duct is formed by previously laminating a resin film or sheet having a fiber layer and an open-cell resin layer, and then slitting the strip into a band-like body 3, sandwiching a reinforcing body 4 in an overlapping portion 5, and fusing the spiral body. It is rolled and molded. The resin film or sheet having the open-cell resin layer and the fiber layer of the duct may be separately slit with a constant width, and may be spirally wound while being fused or bonded. The bellows structure is formed by shaping the valley shape by pressing between the reinforcing bodies while heating them in parallel with the reinforcing bodies with a disc-shaped roller or the like. The ridges and valleys may be shaped by pushing them parallel to the reinforcing body while heating the space between the reinforcing bodies from the inner surface of the pipe with a disc-shaped roller or the like. In addition, as a method of molding the duct,
A method of spirally winding is preferable, but a method of winding the same material on a mandrel to form sushi is also possible.

In the present invention, woven cloth and non-woven cloth are mentioned as typical examples of the fiber layer 1, and non-woven cloth is the best.
The non-woven fabric can not only reduce the temperature difference generated between the duct and the environment by the air held in the non-woven fabric to prevent dew condensation, but also disperse the generated dew condensation inside to prevent dew condensation. As the non-woven fabric having these characteristics, a needle punched non-woven fabric having a thickness of 0.3 to 3.0 mm and a basis weight of about 30 to 300 g / m ² using fibers of 5 denier or less is suitable. Examples of the fiber material include polyester, polyamide, polyolefin, (polyethylene, polypropylene, etc.), polyacrylonitrile, polyvinyl alcohol (vinylon), and the like. Among them, polyester is preferable.

The resin film or sheet 7 imparts more excellent airtightness and heat insulation to the duct, and also functions as a melt adhesive for sticking the fiber layer 1 to the outer layer of the duct. Typical examples of the resin film or sheet include polyethylene, polypropylene, polyvinyl chloride, ethylene-vinyl acetate copolymer and the like, with polyethylene being the best. Polyethylene has not only good fusion performance, but also sufficient airtightness. The optimum polyethylene sheet has a thickness of 0.02 to 1.0 mm, preferably 0.05 to 0.5 mm, and a basis weight of 18 to 900 g /
One of them is about m ³ .

The open-cell resin layer 2 is an open-cell resin layer having bubbles connected to each other and having substantially air permeability. Here, “having substantially breathability” also includes a substance having little breathability.

By using the open-cell resin layer, excellent sound absorption and flexibility can be imparted, and the flexibility can be improved. As the material of the open-cell resin layer,
Examples thereof include polyvinyl chloride, polyolefin (polyethylene, polypropylene), polyurethane, and various rubbers, and of these, an open-cell resin layer made of polyurethane or rubber is preferable. The expansion ratio of the open-cell layer is not particularly limited, but considering the sound deadening performance and the flexibility together, the thickness obtained by heating the resin to foam the foaming agent to a volume ratio of about 40 to 60 times. Is 1 to 1
0 mm is suitable.

As the reinforcing member, any hard material having a spiral or ring shape and a linear shape can be used. However, considering durability and economical efficiency, the rust-prevented core diameter is 0.5 to
2.0 mm hard steel wire is mentioned as a suitable thing. In FIG. 2, it is a preferable mode that the reinforcing member is located in the overlapping portion of the material in order to fix the reinforcing member to the duct, but this is not particularly limited, and the reinforcing member is exposed to the inner surface of the pipe and hard. It is also possible to maintain the shape by the rigidity of the material.

The thickness of the resin film or sheet having the fiber layer of the duct thus obtained is 0.3 to 3.0.
mm, more preferably 0.8 to 2.0 mm, and the thickness of the foam resin layer is 2.0 to 20.0 mm, more preferably 3.0 to 10.0 mm.

[0012] As described above, the duct comprising the resin film or sheet having the fiber layer, the open cell resin layer and the reinforcing body, and having the fiber layer provided on the outer surface of the pipe, particularly on the outermost surface, has excellent heat insulation and prevention of dew condensation. It has flexibility, flexibility, and sound absorption, and further, it is possible to reduce the bulkiness and reduce the space. Further, the duct has no problem in workability even if cut arbitrarily. Therefore, the duct of the present invention is
It is extremely useful as an air conditioning pipe.

[0013]

The present invention will be further described with reference to the following examples. Example 1 The duct shown in FIGS. 1 and 2 was obtained by the following method.

A needle-punched non-woven fabric having a weight per unit area of 120 g / m ² , a specific gravity of 0.08, and a thickness of 0.6 mm, made of 3 denier polyester fiber, has a thickness of 0.3 mm and a weight of 270.
Laminate and bond polyethylene film of g / m ²
A polyurethane foam (open cell layer) having a thickness of 4 mm, a foaming ratio of 50 times and a density of 25 kg / m ³ was laminated and adhered so as to sandwich the film, thereby forming a three-layer structure laminate. The strips obtained by slitting the laminate with a width of 35 mm were overlapped with each other with a constant width while spirally winding the nonwoven fabric on the outer surface, and the overlapped portions were melt-bonded with a non-frame torch. At this time, at the same time 1.0
A mm steel wire was sandwiched and positioned as a reinforcement. In the bellows structure, a valley shape was formed by pressing between the reinforcing bodies with a disc-shaped roller or the like while heating in a direction parallel to the reinforcing bodies. Inner diameter 100m at mountain part obtained from these materials and processes
I got a m duct.

Comparative Example 1 A spiral tube having an inner diameter of 100 mm and made of a 0.5 mm zinc iron plate was wrapped with 25 mm glass wool having an aluminum foil laminated on the surface so that the aluminum foil was on the outer surface, and the spiral tube was formed with a turtle shell net. I got a pressure insulation duct.

Comparative Example 2 Polyethylene foam (closed-cell resin layer) having a thickness of 4 mm, a foaming ratio of 40 times, and a density of 44 kg / m ³ was slit into a width of 35 mm, spirally wound with an overlapping width of about 10 mm, and simultaneously overlapped. Part is heated with a non-frame torch and the wire diameter is 1.0
A spiral hard steel wire of mm was positioned in the approximate center and heat fused to form an inner tube. A fiber layer strip formed by laminating a polyethylene sheet having a thickness of 0.5 mm on a needle punched nonwoven fabric having a basis weight of 120 g / m ² and a thickness of 0.6 mm and using a polyester fiber of 3 denier on this surface, and slitting the width to 35 mm, The sheet surface was melted with a non-frame torch and spirally wound around the tube surface while being fused to the polyethylene foam side.
The bellows-shaped shaping was performed by pressing between the reinforcing bodies while heating them in parallel with the reinforcing bodies with a disk-shaped roller or the like, and shaping the valley shape to obtain a heat insulating duct having an inner diameter of 100 mm below the ridges.

Thermal insulation performance and dew condensation are as follows: temperature 40 ° C, humidity 70%
In the environment of, the ducts obtained in the examples and comparative examples are piped,
Cold air of 18 ° C. was blown into the tube at 400 m ³ / hour for 6 hours, and the tube surface temperature and the state of dew condensation were confirmed 1 hour and 6 hours after the start.

Table 1 shows the heat insulation performance and dew condensation prevention performance of Example 1 and Comparative Examples 1 and 2.

[0019]

[Table 1]

The sound absorbing performance is shown in Example 1 and Comparative Examples 1-2.
The duct obtained in 1. was cut at 1 m to prepare a sample, a sound with a sound pressure of 100 db was emitted from one end of the sample, and the sound pressure at the other end 1 m ahead was measured to compare the sound absorbing performance. This measurement was performed in an anechoic chamber.

The sound absorbing performance of Example 1 and Comparative Examples 1 and 2 are shown in Table 2.
Street.

[0022]

[Table 2]

The ducts obtained in Example 1 and Comparative Examples 1 and 2 were bent to the smallest extent within the range in which the pipe shape was maintained, and the arc diameter at that time was measured to obtain the minimum bend diameter. The results are shown in Table 3.

[0024]

[Table 3]

[0025]

EFFECTS OF THE INVENTION The duct of the present invention has excellent heat insulation properties and dew condensation prevention properties in air-conditioning pipes, and since it is highly flexible, the pipe workability is also excellent. Further, it has a sound absorbing property and can attenuate the fan sound and the motor sound propagating in the duct.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an example of a strip-shaped body used in the present invention, which is slit to a constant width.

FIG. 2 is a plan view showing a partial cross section of the duct of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Fiber layer 2 Open cell resin layer 3 Band 4 Reinforcement 5 Overlapping part 6 Overlapping part boundary line 7 Resin film or sheet

Claims (5)

[Claims] 1. A tubular body composed of a resin film or sheet having a fiber layer, an open-cell resin layer, and a reinforcing body, wherein the fiber layer is located on the outer surface of the tube, and the reinforcing body has a spiral or ring shape. The provided duct. 2. The resin film or sheet having a fiber layer slit to a constant width and the open-cell resin layer are spirally wound with an overlapping portion, and the overlapping portion is fused or adhered. Duct. 3. A belt-shaped body obtained by slitting a laminated body of a resin film or sheet having a fiber layer and a foam resin layer to a certain width is spirally wound with an overlapping portion, and the overlapping portion is fused. Alternatively, the duct according to claim 1, which is adhered. 4. The duct according to any one of claims 1 to 3, wherein the reinforcing body is sandwiched in the overlapping portion and fusion-bonded or bonded. 5. The duct according to any one of claims 1 to 4, wherein the reinforcing bodies are formed so as to have peaks or valleys.