JP2004132665A - Duct hose for air conditioning - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To circulate clean air by removing volatile organic compounds from air in a living space. <P>SOLUTION: A belt type porous sheet 5 on which activated carbon is adhered and fixed as a gas adsorption material is spirally wound. A wire like body 7 is spirally wound along a side edge against which the sheet abuts. A tubular body 1 is formed by integrally fixing the porous sheet 5 and the wire like body 7 to be a ventilation passage. Surface of the tubular body 1 is coated with a heat insulating layer 3 of glass wool. Volatile organic compounds mixed in air flowing in the ventilation passage are removed by the gas adsorption material. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a technology of an air conditioning duct hose having a function of adsorbing and removing volatile substances that are volatilized from an adhesive, a synthetic resin, and the like used in building materials and are a cause of so-called sick house syndrome. is there.
[0002]
[Prior art]
As shown in FIG. 4, a conventional air conditioning duct hose has a ventilation passage formed by a tubular body 12 forming an inner wall layer, and the surface of the tubular body 12 is covered by a sound absorbing layer 13 to reduce noise. In addition, the surface of the sound absorbing layer 13 is covered with a heat insulating layer 14 to prevent dew condensation (for example, see Patent Document 1). Note that the surface of the heat insulating layer 14 is covered with the outer coating layer 15.
[0003]
Then, the tubular body 12 is formed into a tubular shape by a glass cloth, and on the surface thereof, a steel wire is spirally wound or a belt-shaped nonwoven fabric sheet is spirally wound in order to reinforce and retain the shape. In order to reinforce and retain the shape, a linear body made of a synthetic resin is spirally wound on the surface.
[0004]
[Patent Document 1]
JP-A-8-247348
[Problems to be solved by the invention]
In recent buildings, air-tightness is increased and natural ventilation is difficult to achieve in order to improve energy efficiency of cooling and heating by an air conditioner.
[0006]
On the other hand, plastic materials are used as building materials, and organic compounds such as adhesives and treating agents are used in building materials. Volatile organic compounds are easily generated from these organic compounds, so-called sick house syndrome. It is a factor.
[0007]
The air conditioner circulates the air in the room through a duct hose for air conditioning.Volatile organic compounds that have volatilized in a highly airtight living space are mixed into the indoor air and circulated to the living space. There is a problem that the stagnation may cause so-called sick house syndrome.
[0008]
Therefore, the present invention solves such a problem. By forming a ventilation path with a band-shaped porous sheet to which a gas adsorbent is fixed, volatile organic compounds mixed in air circulating in a living space are provided. It is an object of the present invention to provide an air conditioning duct hose that can remove a compound by a gas adsorbent and circulate clean air into a living space.
[0009]
[Means for Solving the Problems]
In order to solve the above problems, in the air conditioning duct hose of the present invention, a strip-shaped porous sheet to which a gas adsorbent is fixed is spirally wound, and a linear body is formed along a side edge that comes into contact with the porous sheet. The ventilation passage is constituted by a tubular body integrally fixed in a spiral shape.
[0010]
A gas adsorbent is fixed to the porous sheet that is spirally wound to form the wall surface of the ventilation path, and the gas adsorbent is mixed with air flowing through the ventilation path. Since organic compounds are adsorbed and removed, clean air can be circulated and circulated in the living space.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
The air-conditioning duct hose of the present invention can be embodied in the forms described in the respective claims.
[0012]
That is, the air conditioning duct hose of the present invention is formed by spirally winding a strip-shaped porous sheet to which a gas adsorbent is fixed, and forming a linear body along the abutting side edge. Is spirally wound, the porous sheet and the linear body are integrally fixed to form a tubular body, and the surface of the tubular body is covered with at least a layer having a heat insulating function.
[0013]
Then, a gas adsorbent is fixed to the porous sheet that is spirally wound to form the wall surface of the ventilation path, and the gas adsorbent is a volatile organic compound mixed in air flowing through the ventilation path. Is adsorbed and removed, so that clean air can be circulated and circulated in the living space.
[0014]
In addition, since the linear body is spirally wound along the contacting side edge of the spirally wound porous sheet and is integrally fixed to the porous sheet, the contacting side edges are joined together. In addition, since the linear body is spirally wound on the surface of the tubular body, the shape is maintained well, and the flow of air in the tubular body is not hindered, and the strength is improved. It has good flexibility and flexibility, and also has good workability such as installation and piping.
[0015]
Further, since the inner wall of the tubular body is smoothed by the porous sheet, the pressure loss is small. In addition, the tubular body becomes air permeable by the porous sheet, and can absorb airflow noise.
[0016]
In addition, since the spirally wound linear body and the porous sheet are integrally fixed, the porous sheet extends between the linear bodies and is stretched to maintain a large surface area of the ventilation path wall surface. However, the adsorption capacity of the gas adsorbent can be increased.
[0017]
Further, the function of preventing dew condensation by the layer having a heat insulating function is maintained without deterioration.
[0018]
In addition, as a gas adsorbent, a redox method, an addition condensation method, or the like, a chemical bond type in which an adsorption function is performed by a chemical bond, a physical adsorption type using a physical adsorption function of a porous surface, and a photocatalyst are used. There are catalytic decomposition types, but each type has its own weaknesses, so it is necessary to use it to take advantage of its advantages.
[0019]
For example, an acrylic acid compound is used as a chemical bond type compound, and these compounds have an adsorption performance for a gas such as formaldehyde, but exhibit an adsorption performance due to a chemical bond. There is also a weak point that there is no gas, and as the physical adsorption type, activated carbon, activated clay, ceramics, etc. are used and have excellent adsorption performance and adsorption speed for a wide range of gases. It has a weak point of selective adsorption that is inferior in adsorption performance, and furthermore, titanium oxide particles and the like are used as the catalytic decomposition type, but depending on the porous sheet fixing these, it is easily decomposed by the gas adsorbent It has the weak point that there is something.
[0020]
Therefore, it is effective to use a plurality of gas adsorbents in combination to compensate for their weaknesses. In this case, however, it is necessary to take into account that the gas adsorbents do not chemically bond with each other and hinder the adsorption performance. is there.
[0021]
Examples of the porous sheet include a sheet formed using fibers such as natural fibers and chemical fibers, for example, a fibrous sheet in which fibers are integrated, a nonwoven fabric, a paper sheet, and the like, and a synthetic resin film. Alternatively, a microporous sheet provided with fine through holes can be used.
[0022]
Next, a method of fixing the gas adsorbent to the porous sheet will be described.
[0023]
In the case of a particulate gas adsorbent such as a physical adsorbent type gas adsorbent or a catalytic decomposition type gas adsorbent, the gas adsorbent is bonded and fixed to a porous sheet with a binder, or two sheets. The gas adsorbent can be held between the porous sheets, and the gas adsorbent can be adhered to the porous sheet and fixed.
[0024]
In the case of a solution such as a chemical bonding type gas adsorbent, the porous sheet is fixed by forming a porous sheet using fibers supporting the gas adsorbent, or the gas adsorbent is impregnated and held in the porous sheet. Alternatively, the gas adsorbent may be supported on porous particles such as activated carbon, and the porous particles may be bonded and fixed to a porous sheet with a binder.
[0025]
In the case where a gas adsorbent is sandwiched and fixed between two porous sheets, fixing a gas adsorbent having a different adsorption performance to each porous sheet is effective because the respective adsorption performances are complemented. .
[0026]
The strip-shaped porous sheet to which the gas adsorbent is fixed is spirally wound, and the linear body is spirally wound along the abutting side edge, and the porous sheet and the linear body are integrally fixed. In order to form the tubular body by using a known tubular body forming machine, the tubular body can be formed.
[0027]
For example, a case where a linear body of a synthetic resin is used as the linear body will be described below.
[0028]
A rotating drum is used which has on its surface a number of rotatable rollers having a rotation axis inclined with respect to its own rotation axis. When the band-shaped porous sheet is supplied to the rotating drum so that the side edges of the band-shaped porous sheet abut against each other, the porous sheet is spirally wound on the rotating drum. Is done. Then, the synthetic resin melted from the extruder is supplied linearly along the side edge of the porous sheet in contact with the porous sheet, and the molten linear synthetic resin is pressed against the surface of the porous sheet by a roller. While solidifying, a linear body is formed. The linear body and the porous sheet are adhered to each other, and the side edges of the porous sheet are joined to form a tubular body having good air permeability.
[0029]
When the tubular body thus obtained is used as a ventilation path, the wall surface is smoothed by the porous sheet, the pressure loss is small, and the flexibility is excellent.
[0030]
Further, by using glass wool, a synthetic foam having a closed cell structure, or the like as a layer having a heat insulating function for covering the surface of the tubular body, heat insulating properties can be secured and dew condensation can be prevented.
[0031]
In addition, when glass wool is used, it also has a sound absorbing function, so that the airflow sound absorbed by the tubular body can be absorbed and the noise can be further reduced. When a foamed synthetic resin with a closed-cell structure is used as a layer having a heat insulating function, a sound-absorbing layer made of glass wool, a foamed synthetic resin with an open-cell structure, etc. is separately formed in order to provide a sound absorbing function. By doing so, the airflow sound absorbed by the tubular body can be absorbed and the noise can be reduced.
[0032]
In addition, when the layer having the heat insulating function is formed, the sheet having the heat insulating function is spirally wound and formed in the same manner as in the case of forming the tubular body with the strip-shaped porous sheet. It will be.
[0033]
Also, when the gas adsorbent is fixed by the two strip-shaped porous sheets, the gas adsorbent is sandwiched by the porous sheets, so that the gas adsorbent falls off or comes off. Is preferred.
[0034]
Furthermore, when a nonwoven fabric sheet is used as the strip-shaped porous sheet as described in claim 3, the tubular body has excellent air permeability, and the contact between the flowing gas and the gas adsorbent becomes good, which is effective. It is.
[0035]
The nonwoven fabric sheet preferably has a basis weight of 30 g / m ² or more in consideration of air permeability and contact with a gas adsorbent.
[0036]
However, when the linear body of the synthetic resin as described above is spirally wound, since the linear body and the nonwoven fabric sheet are adhered to each other, the fibers are sufficiently present, and the entanglement strength is somewhat increased. Otherwise, the fiber will peel off due to the potential elastic restoring force generated in the linear body, and if the linear body is pressed by a roller, if the basis weight is small, the particulate gas adsorbent will adhere to the surface. There is a risk of exposure and falling off. Therefore, the effective weight of the nonwoven fabric used on the side to which the linear body is fixed is about 70 g / m ² .
[0037]
【Example】
An embodiment of the present invention will be described with reference to FIG. 1 showing a part of an air conditioning duct hose in cross section, FIG. 2 showing a side cross section of a tubular body, and FIG. 3 showing a schematic cross section of a porous sheet.
[0038]
In FIG. 1, reference numeral 1 denotes a tubular body which forms an inner wall layer of an air conditioning duct hose body 2 to form a ventilation path, and 3 denotes a heat insulating layer which covers the surface of the tubular body 1 by winding a glass wool sheet into a tube. Has formed. In addition, since the glass wool sheet has a heat insulating function and a sound absorbing function, the heat insulating layer 3 can also reduce noise. When the heat insulating layer 3 is formed by spirally winding the independent foamed resin sheet, the heat insulating layer 3 has only a function of preventing dew condensation. Reference numeral 4 denotes an outer coating layer that covers the surface of the heat insulating layer 3 and is formed by winding a polyethylene tape.
[0039]
The tubular body 1 is formed by spirally winding a band-shaped porous sheet 5 in which a gas adsorbent is fixed to a non-woven fabric of polypropylene fiber, and is made of polypropylene along a side edge in contact with the sheet. It is formed by spirally winding and linearly fixing the letter-shaped linear body 7 (see FIG. 2).
[0040]
When the polypropylene constituting the linear member 7 is solidified, the side edges of the porous sheet 5 are integrally fixed to the ribs 6 of the linear member 7, and the contacting side edges of the porous sheet 5 are also joined to each other, so that the ventilation The tubular body 1 having flexibility and flexibility and having a smooth inner wall surface is formed.
[0041]
Reference numeral 8 denotes a shape-retaining wire made of polypropylene that is spirally wound along the center line of the porous sheet 5 and is integrally fixed to the porous sheet 5. This prevents the porous sheet 5 located in the compression section from being extremely compressed and reducing the surface area.
[0042]
Porous sheet 5 is a basis weight of 30 g / m ^2, an inner porous sheet 9 made of polypropylene fiber of the nonwoven fabric, the basis weight at the 70 g / m ^2, the two layers of the outer porous sheet 10 made of polypropylene fiber nonwoven (See FIG. 3).
[0043]
The linear body 6 and the shape-retaining wire 8 are fixed to one surface of the outer porous sheet 10, and coconut shell activated carbon is fixed as a gas adsorbent 11 to the other surface. One surface of the inner porous sheet 9 forms a wall surface of a ventilation path, and polyallylamine is fixed as a gas adsorbent on the other surface.
[0044]
The two porous sheets 9 and 10 are laminated so that the surface of the outer porous sheet 10 on which the activated carbon is fixed and the surface of the inner porous sheet 9 on which the polyallylamine is fixed face each other. The porous sheet 5 can be obtained by adhering and holding and fixing the gas adsorbent.
[0045]
In this case, activated carbon has poor adsorption performance to formaldehyde, and polyallylamine complements this.
[0046]
【The invention's effect】
The present invention is embodied in the form described above, and has the following effects.
[0047]
Volatile organic compounds mixed into the air flowing through the ventilation passage of the air conditioning duct hose are removed by adsorption by the gas adsorbent, and clean air can be circulated and circulated in the living space. Since the road has air permeability, the airflow noise is absorbed and the noise is reduced, and the air conditioning duct hose has excellent flexibility.
[Brief description of the drawings]
FIG. 1 is a side view showing a cross section of a part of an air conditioning duct hose according to an embodiment of the present invention.
FIG. 2 is a side sectional view of the tubular body in FIG.
FIG. 3 is a schematic diagram showing a cross section of the porous sheet in FIG. 1;
FIG. 4 is a side view showing a cross section of a part of a conventional air conditioning duct hose.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Tubular body 3 Heat insulation layer 5 Porous sheet 7 Linear body 9 Inner porous sheet 10 Outer porous sheet 11 Gas adsorbent

Claims (3)

The strip-shaped porous sheet to which the gas adsorbent is fixed is spirally wound, and the linear body is spirally wound along the side edge that comes into contact with the porous sheet. An air-conditioning duct hose which is fixed to form a tubular body, and the surface of the tubular body is covered with a layer having at least a heat insulating function. The air conditioning duct hose according to claim 1, wherein the gas adsorbent is fixed by two strip-shaped porous sheets. The air conditioning duct hose according to claim 1 or 2, wherein the strip-shaped porous sheet is a nonwoven fabric sheet.

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