JP3705532B2 - Duct hose - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a duct hose, and more particularly to a flexible duct hose excellent in both heat insulation and sound absorption.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, a duct structure that secures heat insulation and sound absorption by providing a synthetic resin foam layer having closed cells on the inner surface of a metal duct connected to the main body of an air conditioner, and further providing a synthetic resin foam layer having open cells on the inner surface. Is known from Japanese Utility Model Publication No. 48-2785.
[0003]
However, applying the duct structure as described above to a flexible duct used for new applications such as a heat exchange air unit, which will be described later, cannot cope with various building structures and construction methods, piping is difficult, and construction is troublesome. Become a thing.
[0004]
That is, in recent years, as one of the energy-saving and comfortable living environments, there has been a demand for highly airtight and highly insulated houses that can not only save energy for heating and cooling, but also maintain a stable indoor air environment throughout the day. In highly insulated homes, it is essential to design an active ventilation system to address the new problems of reduced natural ventilation and air pollution due to lack of ventilation and the generation of condensation, mold and odor.
[0005]
And, as a part of the ventilation system, a flexible duct is piped on the back of the ceiling of the house, and it is required to supply the outside air supplied by the blower into the room through the duct. In terms of performance, both heat insulation and sound absorption are required. In other words, it is necessary to provide heat insulation to prevent condensation on the outer surface of the duct due to a significant temperature difference between the inside and outside of the duct, and at the same time, noise from the blower propagates through the inside of the duct to the room. In order to prevent this, it is necessary to provide sound absorption.
[0006]
[Purpose, configuration, action and effect of the invention]
Therefore, the object of the present invention is to provide excellent thermal insulation and sound absorption and flexibility as a part of the above-mentioned applications, can be used for various building structures and construction methods, and can be freely piped and installed. It is to provide a flexible duct. Another object of the present invention is to provide a duct hose having a structure that can be molded easily and continuously even if it is long.
[0007]
In order to achieve the above-mentioned object, the duct hose according to the present invention has an inner wall formed by winding a tape made of ventilation material in a spiral shape, connecting the side edges thereof and retaining the shape with a hard spiral reinforcement. On the outside, a sound-absorbing layer formed by spirally winding an open-cell structure soft foam tape and a heat-insulating layer formed by spirally winding a closed-cell structure soft foam tape and adhering adjacent side edges It is characterized by being laminated. In addition, a flexible foam tape with an open cell structure is spirally formed on the outside of the inner wall formed by winding a tape made of ventilation material in a spiral shape, connecting the side edges thereof and retaining the shape with a hard spiral reinforcement. A sound absorbing layer formed by winding and a heat insulating layer formed by spirally winding a soft foam tape having an open cell structure are formed, and an intermediate wall made of a flexible material is provided between the sound absorbing layer and the heat insulating layer. In addition, an outer wall made of a flexible material is provided outside the heat insulating layer. In addition, by winding a wide flexible tape on the outside of the sound absorbing layer so as to overlap with the preceding one, by winding and inserting a soft foam tape having an open cell structure in a spiral between the overlapping portions While forming a heat insulation layer, an intermediate wall and an outer wall are formed with the said flexible tape.
[0008]
In the present invention, since the inner wall of the duct hose is formed of a breathable material, it can absorb the sound of the airflow inside the hose and absorb the sound with the sound absorbing layer, and at the same time ensure the heat insulating property with the heat insulating layer laminated on the sound absorbing layer. it can.
In addition, when the heat insulating layer is wound in a spiral shape with a soft foam tape having a closed cell structure and the adjacent side edges are fixed by heat fusion or adhesion, the heat insulating layer becomes a stable and coherent layer. This is advantageous when used without forming a protective outer wall.
Further, since all of the inner wall, the sound absorbing layer, and the heat insulating layer are formed of a flexible material, the flexibility is excellent, and piping can be freely made without using an elbow, and the operation is easy.
[0009]
In addition, since all the components of the duct hose can be formed by spirally winding the strip, it is possible to form a hose of indefinite length continuously, which is efficient and has an appropriate diameter from a small diameter to a large diameter. Since it can be molded, it can be applied to various building structures, and for example, it can be easily installed in a narrow space.
[0010]
In addition, when a metal strip is used as the rigid helical reinforcement body and the bent edges at both ends thereof are crimped and the tape made of breathable material is sandwiched and connected, the inner peripheral surface of the inner wall of the hose can be made almost smooth, so In addition to low loss, the inner wall of the hose can be formed very easily.
[0011]
In addition, when an intermediate wall made of a flexible material is interposed between the sound absorbing layer and the heat insulation layer, this can block air and improve heat insulation. But it can be formed. In this case, it is advantageous in molding to form the intermediate wall by winding a flexible tape in a spiral shape.
[0012]
In addition, when a wide flexible tape is spirally wound on the outside of the sound absorbing layer so as to overlap with the preceding one, and an open cell soft foam tape is inserted between the overlapping portions, open cell The outer circumference of the soft foam tape is surrounded by a flexible tape, and when the hose is bent and piped, the heat insulation layer is not displaced, and the protective outer wall prevents damage to the heat insulation layer. Since the intermediate wall can be formed at the same time, the hose can be formed efficiently.
[0013]
【Example】
Hereinafter, one embodiment of a duct hose according to the present invention will be described with reference to the accompanying drawings.
In FIG. 1, a duct hose 1 includes an inner wall 2, a sound absorbing layer 5, an intermediate wall 6, and a heat insulating layer 7. The inner wall 2 has a bent edge formed on both sides of a metal band 4 such as a galvanized steel sheet spirally wound on the side edge of a breathable tape 3 such as a polyester nonwoven fabric wound spirally, and is fixed by crimping. The tape 3 is connected and shaped and reinforced by a metal strip 4. The sound absorbing layer 5 is formed by spirally winding a soft foam tape having an open cell structure such as foamed urethane around the outer periphery of the inner wall 2. The intermediate wall 6 is formed by spirally winding a synthetic resin tape such as polyethylene around the outer periphery of the first foam layer 5. The heat insulation layer 7 is formed by winding a soft foam tape of closed cell structure such as polyethylene foam spirally around the outer periphery of the intermediate wall 6 and adjoining its adjacent side edges 7A by heat fusion or the like. .
[0014]
Therefore, the duct hose of the present example is excellent in flexibility, easy to handle in piping construction, and rich in adiabatic sound absorption, and the following test results were obtained.
As for heat insulation, when a cold air of 110 ° C. was allowed to flow in a hose (hose length of about 3 m) for 24 hours in an atmosphere of 20 ° C., and whether or not condensation occurred on the outer surface of the hose, fine attachment was observed. However, there was no dripping and there was no problem in use.
For sound absorption, an alarm that generates a sound source of 99 dB is attached to the tip of a hose (hose length of about 3 m), a microphone is attached to the rear end of the hose, and how much sound is absorbed is measured, it attenuates to about 65 dB. It was confirmed.
[0015]
In addition, the duct hose which concerns on this invention is not limited to the said Example, It can change variously within the range of the summary. For example, a synthetic resin provided with other fibers and through holes in addition to the nonwoven fabric can be used as the air-permeable tape constituting the inner wall, and the hard spiral reinforcement may be hard steel as long as it can shape-reinforce the inner wall. Metal wires such as wires can also be used.
The intermediate wall may be formed by spirally winding a tape of a flexible material such as cloth or rubber other than a synthetic resin, or by coating a tube-shaped flexible material instead of a tape shape. May be. Further, in some cases, the formation of the intermediate wall may be omitted.
[0016]
FIG. 2 shows a duct hose 1 ′ as another embodiment. In this duct hose 1 ', the construction of the inner wall 2, the sound absorbing layer 5 and the intermediate wall 6 is the same as that of the embodiment of FIG. Is formed by spirally winding a synthetic resin tape such as polyethylene on the outside to form a protective outer wall 8.
According to this embodiment, the same effects as those of the above embodiment can be expected, such as excellent heat insulating sound absorption.
The outer wall may be formed by spirally winding a tape of a flexible material such as cloth or rubber other than synthetic resin, or by covering a tube-shaped flexible material instead of a tape shape. May be.
[0017]
FIG. 3 shows another embodiment, and the duct hose 1 ″ has the same configuration as that of the embodiment of FIG. 1 because the configuration of the inner wall 2 and the sound absorbing layer 5 is omitted. However, the intermediate wall 6 and the outer wall 8 are separated by one wide. In other words, a flexible soft vinyl chloride resin tape T extruded on the outside of the sound-absorbing layer 5 is spirally wound so as to overlap with the preceding tape, and its side edges are formed. The heat insulating layer 7 is formed by heat-sealing each other and inserting a soft foam tape having an open cell structure into a spiral space formed by the intermediate wall 6, the outer wall 8 and the partition wall 9 in an unbonded state. is there.
According to the present embodiment, even when the hose is bent during storage or piping, the heat insulating layer is surrounded by the tape T, so that a gap is generated in the heat insulating layer without causing positional displacement. It can be reliably prevented.
[0018]
Note that the duct hose according to the embodiment of the present invention described above is obtained by winding the strip of the hose constituent material in a spiral manner on a conventionally known hose forming rotary shaft. It does not require new molding equipment.
[Brief description of the drawings]
FIG. 1 is a partially longitudinal side view of a duct hose showing an embodiment of the present invention.
FIG. 2 is a partially longitudinal side view of a duct hose showing another embodiment of the present invention.
FIG. 3 is a partially longitudinal side view of a duct hose showing another embodiment of the present invention.
[Explanation of symbols]
1, 1 ', 1 "Duct hose 2 Inner wall 3 Breathable tape 4 Metal strip 5 Sound absorbing layer 6 Intermediate wall 7 Heat insulating layer 8 Outer wall

Claims (3)

A flexible foam tape with an open cell structure is spirally wound on the outside of the inner wall that is formed by spirally winding a ventilation material tape to connect the side edges of the tape and holding the shape with a hard spiral reinforcement. A duct hose formed by laminating a heat-insulating layer formed by winding a sound-absorbing layer and a soft foam tape having a closed cell structure in a spiral shape and adhering adjacent side edges thereof . A flexible foam tape with an open cell structure is spirally wound on the outside of the inner wall that is formed by spirally winding a ventilation material tape to connect the side edges of the tape and holding the shape with a hard spiral reinforcement. And a heat insulation layer formed by spirally winding a soft foam tape having an open cell structure and an intermediate wall made of a flexible material interposed between the sound absorption layer and the heat insulation layer. And the duct hose which provided the outer wall which consists of flexible materials in the outer side of the said heat insulation layer. A heat-insulating layer is formed by winding a wide flexible tape on the outside of the sound-absorbing layer in a spiral so as to overlap with the preceding one, and winding and inserting a soft foam tape having an open cell structure in a spiral between the overlapping portions. The duct hose according to claim 2, wherein an intermediate wall and an outer wall are formed by the flexible tape.

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