JPH09166277A - Heat insulated duct - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an air conditioner duct excellent in heat insulation dewing resistance, and sound absorbing property by forming a pipe body with a fiber layer, an independent bubble resin layer, a continuous bubble resin layer, and reinforcing bodies, positioning the fiber layer on the outside of the pipe and the continuous bubble resin layer on the inside of the pipe, and forming the reinforcing bodies spirally or in ring shape. SOLUTION: A heat insulated duct used as a heat insulated pipe for air conditioner piping is formed by binding and fusing reinforcing bodies 5 in an overlapped part 6 and winding it spirally, using a band body of a fixed width on which a fiber layer, an independent bubble resin layer, and a continuous bubble resin layer are laminated. Also, in a bellows structure, its bottom part form is provided by pressing the part between the reinforcing bodies while they are heated by disk rollers in parallel with the reinforcing bodies. 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 from the inner surface of a pipe in parallel to the reinforcing bodies while they are heated by the disk rollers. As a fiber layer, woven or unwoven cloth can be cited. However, unwoven cloth is suitable and, therefore, 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 improves the efficiency of heat insulation and dew condensation prevention in air-conditioning pipes, reduces the space of heat-insulating duct pipes, allows easy cutting and bending, and also has sound absorbing performance. However, the present invention relates to a heat insulating duct that can attenuate fan noise and motor noise propagating in the duct.

[0002]

2. Description of the Related Art Conventionally, as heat insulating pipes in air conditioning pipes, glass wool mainly laminated with aluminum foil is wound on metal pipes and pressed with a hexagonal net, or is straightened by fixing glass wool with a resin binder. A tube with aluminum foil attached to its surface is used.
However, since these are not flexible, ducts made of flexible glass wool are used in the bent portion (Japanese Utility Model Publication No. 51-37214, Japanese Utility Model Publication No. 59-1224).
80).

[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 heat insulation duct which does not have a problem in workability.

[0004]

The above object comprises a tubular body composed of a fiber layer, a closed cell resin layer, an open cell resin layer and a reinforcing member, wherein the fiber layer is the outer surface of the tube, and the open cell resin layer is This is achieved by providing a heat-insulating duct located on the inner surface of the pipe and in which the reinforcement is provided in a spiral or ring shape.

[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 4 in which a laminated body of a fiber layer 1, a closed cell resin layer 2 and an open cell resin layer 3 used in the present invention is slit into a certain width. FIG. 2 is a plan view showing a cross section of a part of the heat insulating duct of the example of the present invention. The heat insulation duct is formed by previously laminating the fiber layer, the closed cell resin layer, and the open cell resin layer, and then slitting them into a certain width to form the strip-shaped body 4.
The reinforcing body 5 is sandwiched in the overlapping portion 6 to be fused and wound, and wound into a spiral shape. The closed-cell resin layer, the open-cell resin layer, and the fiber layer of the heat insulating duct may be separately slit with a constant width and 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. Further, as a method of forming the heat insulating duct, a method of spirally winding is suitable, 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 not only can reduce the temperature difference between the heat insulation 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 closed-cell resin layer 2 is a layer of a foamed resin which is substantially impermeable to air, and each of the bubbles in the foam is enclosed by a partition wall or a plurality of bubbles are packaged by a partition wall. Any structure having airtightness can be used. Here, the phrase “substantially not breathable” includes those having slight breathability. Considering heat insulation, flexibility and sound absorption, the material of the closed cell resin layer is
Examples are polyvinyl chloride, polyolefins (polyethylene, polypropylene), polyurethane, and various rubbers, among which polyolefins (polyethylene, polypropylene, etc.) are preferred. The expansion ratio of the closed-cell resin layer is not particularly limited, but in consideration of heat insulation performance and flexibility, the thickness obtained by foaming the resin 30 to 50 times by volume while crosslinking the resin with an electron beam. Is preferably 1 to 10 mm.

The open-cell resin layer 3 may have any structure as long as it has a structure in which bubbles in the foam are connected to each other to have substantially air permeability. Here, having substantially breathability means that
It also includes those that are not slightly breathable. As the material of the open-cell resin layer, the same materials as those of the above-mentioned closed-cell resin layer can be used, but among these, polyurethane and various rubbers are preferable from the viewpoint of sound absorption. The expansion ratio is not particularly limited, but considering the sound deadening performance and the flexibility together, the thickness is 1 to 10 mm when the resin is heated to foam the foaming agent to a volume ratio of about 40 to 60 times. Are preferred.

In the present invention, as the reinforcing member, any hard material having a spiral or ring shape and a linear shape can be used, but considering durability and economical efficiency, the rust-prevented core diameter is 0.5. A hard steel wire having a thickness of up to 2.0 mm is mentioned as a suitable one. 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 fiber layer of the heat insulation duct thus obtained has a thickness of 0.3 to 3.0 mm, more preferably 0.8 to
It is 2.0 mm, and the thickness of the closed cell resin layer is 1 to 10 m.
m, more preferably 3 to 10 mm, the thickness of the open-cell resin layer is 1 to 10 mm, and more preferably 3 to 10 mm.
It is.

As described above, the fiber layer, the closed cell resin layer, the open cell resin layer and the reinforcing layer are provided, and the fiber layer is provided on the outer surface of the pipe, particularly the outermost surface, and the open cell resin layer is formed on the inner surface of the tube. The provided duct has excellent heat insulating properties, dew condensation preventing properties, sound absorbing properties, and flexibility, and further can suppress 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 extremely useful as an air conditioning pipe.

The present invention will be further described below with reference to examples. Example 1 The heat insulating duct shown in FIGS. 1 and 2 was obtained by the following method. A basis weight of 3 denier polyester fiber 12
Needle punched non-woven fabric 1 with 0 g / m ² and thickness of 0.6 mm
The thickness is 4 mm, the expansion ratio is 40 times, and the density is 44 kg / m.
³ Polyethylene foam (the closed cell resin layer) 2, expansion ratio 50 times a thickness of 4 mm, a polyurethane foam having a density of 25 kg / m ³ (open cell resin layer) 3 are laminated in sheet form, width 35mm The slit-shaped strip 4 was formed. The strips were spirally wound so that the non-woven fabric was on the outer surface, and they were superposed on each other with a constant width, and the superposing portion 6 was melt-bonded with a non-frame torch. At this time, at the same time, a 1.0 mm spiral hard steel wire was sandwiched in the overlapping portion and positioned as a reinforcing body. In the bellows structure, a space between the reinforcing bodies was pressed by a disc-shaped roller or the like while being heated in parallel with the reinforcing bodies to form a valley shape. Inner diameter at the ridge obtained from these materials and processes 1
A heat insulation duct of 00 mm was obtained.

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.

Regarding the heat insulation performance and the dew condensation prevention performance, the ducts obtained in Example 1 and Comparative Example 1 were piped in an environment of a temperature of 40 ° C. and a humidity of 70%, and cold air of 18 ° C. was 400 m ³ / hour for 6 hours. After air was fed, the tube surface temperature and the state of dew condensation were confirmed 1 hour and 6 hours after the start.

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 and 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.

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

[0017]

[Table 1]

The sound absorbing performance is shown in Example 1 and Comparative Examples 1 and 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.

Table 2 shows the sound absorbing performance of Example 1 and Comparative Examples 1 and 2.
Street.

[0020]

[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.

[0022]

[Table 3]

[0023]

EFFECTS OF THE INVENTION The duct of the present invention has excellent heat insulating properties and dew condensation prevention properties, especially in air-conditioning piping, and is highly flexible, so that the duct 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 heat insulating duct tube of the present invention.

[Explanation of symbols]

 1 Fiber Layer 2 Closed Cell Resin Layer 3 Open Cell Resin Layer 4 Band 5 Reinforcement 6 Overlap 7 Overlap Boundary

Claims (5)

[Claims] 1. A tubular body composed of a fiber layer, a closed cell resin 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 open cell resin layer is located on the inner surface of the tube.
A heat insulating duct in which the reinforcing body is provided in a spiral shape or a ring shape. 2. The heat insulation duct according to claim 1, wherein the fiber layer, the closed-cell resin layer and the open-cell resin layer are slit into a certain width, spirally wound with an overlapping portion, and the overlapping portion is fused or adhered. . 3. A belt-shaped body obtained by slitting a laminate of a fiber layer, a closed cell resin layer and an open cell resin layer into a uniform width,
The heat insulation duct according to claim 1 or 2, wherein an overlapping portion is provided, the winding portion is spirally wound, and the overlapping portion is fused or adhered. 4. The heat insulating duct according to claim 1, wherein the reinforcing body is sandwiched in the overlapping portion and fusion-bonded or bonded. 5. The heat insulating duct according to any one of claims 1 to 4, wherein the reinforcing bodies are formed to have peaks or valleys.