JP4702828B2 - Antibacterial air duct - Google Patents

Description

The present invention relates to an antibacterial air duct .

  Bacteria and soot are likely to be generated in an air flow path used in a ventilation / air-conditioning system such as a building or a vehicle, for example, an air duct, so that a problem in terms of hygiene is likely to occur.

Therefore, antibacterial air ducts and antibacterial joints having an antibacterial layer containing an antibacterial substance formed on the inner surface have been proposed (Patent Document 1 and Patent Document 2). Furthermore, an antibacterial treatment system has been proposed in which a sustained release element that slowly releases antibacterial active molecules is attached to the upstream side of the air duct, and a collection filter that collects and removes antibacterial active molecules is attached to the downstream side (patent) Reference 3).
JP-A-10-197040 Noto 3018584 JP 2002-130789 Japanese Patent No. 3317660 JP2004-250839 JP 2002-248309 JP2003-299919 Naoko Kunizawa “New Material Fiber“ Sergaia ”(trademark) and“ Sergaia (trademark) Non-woven Fabric ””, Textile Engineering, Textile Society of Japan, Vol. 55, 2002 No. 10, pp. 399-402 High mesh net for screen doors to prevent pollen and other intrusion at the window [online] November 5, 2003 Teijin Nestex Co., Ltd. [Search January 13, 2005] 1105678305581_0.html

  The antibacterial air ducts and joints of Patent Documents 1 to 2 exhibit sterilization action when air contacts the antibacterial layer, but recent air conditioning systems stop air blowing at night to save energy In this case, the sterilization action of the air duct or the like cannot be effectively exhibited.

  Further, even in the antibacterial treatment system of Patent Document 3, when the ventilation is stopped, the antibacterial active molecules released from the sustained release element are not efficiently released to the downstream side of the air supply duct, and a sufficient sterilization effect is obtained. I can't. Moreover, the existing air-conditioning equipment must be provided with a sustained release element and an antibacterial active molecule collecting filter, and maintenance of these filters is also required.

The present invention, for obtaining an antimicrobial effect using such convection in the air flow path without the efficient and time with a simple structure, Oite antimicrobial air duct, at least a portion of the air passage It is an object of the present invention to provide a material that includes an antibacterial substance in either one of a breathable base material to be configured or a breathable interior material that covers the inner surface of the base material.

The first means is
A base material 2 constituting a duct peripheral wall surrounding the air flow path 11, an interior material 3 formed of a breathable sheet material thinner than the base material and covering the inner surface of the base material, and a non-covering material covering the outer surface of the base material 2 An antibacterial air duct formed with a breathable exterior material 4,
The interior material 3 and the exterior material 4 are each formed as an inner / outer double cylindrical flexible sheet, and a fiber material having air permeability and heat retention as the base material 2 is provided between both the cylindrical portion sheets. Fill and seal both ends of the cylindrical sheet ,
The air permeability of the base material, has a ^{100cm 3 / cm 2 · sec~4000 cm} 3 / cm 2 · sec,
The antibacterial substance is scattered inside the base material 2 and air can be distributed between the base material part where the antibacterial substance is disposed and the air flow path 11 through the interior material part that covers the inner surface of the base material. did.

In addition, the air duct comprised with the base material 2 shall include what uses the multiple wall material surrounding an air flow path as a base material.

The “base material” can be formed of an irregular material such as glass wool or rock wool, and the base material can be packaged with an interior material and an exterior material to be formed as an air duct . The interior material and the exterior material may be formed in a sheet shape thinner than the base material. Incidentally, the content of the antibacterial agent to such the grayed Rasuuru is preferably at least about 1% by weight.

Second means includes said first means, and the air permeability of the interior material 3, and a ^{100cm 3 / cm 2 · sec~2000 cm} 3 / cm 2 · sec.

  The air permeability conforms to the JIS L-1096A method (Fragile form method).

The third means includes either the first means or the second means, and the base material 2 is formed by the laminated composite layers 2a, 2b, and is different in each adjacent layer. Interspersed with various antibacterial substances.

Fourth means includes said first means to the second means, and the substrate 2 a plurality of wall portions 2c to coexist in succession to the air flow path longitudinally formed in 2d ..., and Different types of antibacterial substances are interspersed in adjacent wall portions.

The fifth means includes the first means, and the interior material 3 is made to contain the antibacterial substance corresponding to the inner surface of the base material 2 .

  The interior material in this means functions like an antibacterial filter covering the inner surface of the substrate. That is, by providing an interior material containing a breathable antibacterial substance on the inner surface of the breathable base material, the amount of air entering and exiting the interior material by convection is increased, and the antibacterial action is improved. . The interior material is desirably formed of cellulosic fibers having a hollow structure such as cotton or pulp, and according to this configuration, a large amount of antibacterial substances can be included as described later. The content of the antibacterial substance with respect to the interior material is desirably at least about 1% by weight. Further, the thickness of the interior material may be about 0.05 mm to 20 mm. In this means, it goes without saying that an antibacterial substance may be contained in the substrate 2 as in the second means or the third means.

  “To the whole interior material” means to correspond to the entire area of the inner surface of the base material covered by the interior material. However, it is desirable to disperse the antibacterial substance throughout the thickness direction of the interior material as will be described later.

The sixth means includes the fifth means, and an antibacterial substance contained in the interior material 3 is used as an inorganic antibacterial agent in which an antibacterial metal is supported on an inorganic powder. Scattered throughout.

  The interior material is required to be formed into a thin sheet from the viewpoint of resource saving, but for example, even a thickness of about 1.0 mm is sufficiently large compared to the size of bacteria, so antibacterial substances are scattered in the thickness direction. If this is done, the chance of contact between the antibacterial substance and the bacteria increases. Since aseptic antibacterial agents are physically and chemically stable, they can be easily contained in fibers such as cotton and are suitable for dispersion in interior materials. As already known, silver and copper are suitable as the antibacterial metal, and zeolite is used as the inorganic carrier.

The seventh means includes the means 6 described above, and the air permeability of the interior material 3 is smaller than the air permeability of the base material 2.

  The reason why the air permeability of the interior material is made smaller than that of the base material is to ensure the function as the above-mentioned filter by allowing air to flow more slowly inside the interior material than inside the base material.

Eighth means has one of said fifth means to seventh means, and the air permeability of the interior material 3, and a ^{20cm 3 / cm 2 · sec~500 cm} 3 / cm 2 · sec .

  The reason why the air permeability is limited to this numerical range is that, firstly, it is formed of a cellulosic fiber having a hollow structure such as cotton pulp capable of containing an antibacterial substance at a high density as described above. Secondly, in order to satisfy the condition that it can be performed, secondly, in order to ensure the filter performance as an antibacterial filter, the condition that the air permeability is set to be low is satisfied.

Regarding the first condition, in the test by the applicant, for example, when cotton is used as the material of the interior material, there are variations depending on the measurement location of the material, but about 40 cm ³ / cm ² · sec (for example, 40 ± 10 cm ³ / Air permeability of about cm ² · sec) can be obtained. As the prior art, as a material for a filter, those air permeability A moisture sorption material containing cellulose fibers 30% by weight or more of ^{50cm 3 / cm 2 · sec~700 cm} 3 / cm 2 · sec It has been proposed (Patent Document 5). Thus the scope of the air permeability of the means ^{(20cm 3 / cm 2 · sec~500} cm 3 / cm 2 · sec) is sufficient realizable by cellulosic fibers.

For the second condition, a conventional, air permeability ^{20cm 3 / cm 2 · sec~300 cm} 3 / cm 2 · sec air cleaning filter of (Patent Document 6), air permeability 100cm ³ / cm ² · sec~ An air filter material of 880 cm ³ / cm ² · sec (Patent Document 7), a net for net doors having a permeability of about 360 cm ³ / cm ² · sec (Non-Patent Document 2), and the like are known. The air permeability range of this means is based on these prior art air permeability ranges.

However in order to ensure sufficient antibacterial activity, the air permeability of the interior material, and more preferably ^{20cm 3 / cm 2 · sec~300 cm} 3 / cm 2 · sec, even more preferably 30cm ³ / cm ² · sec ~ 100 cm ³ / cm ² · sec is good.

The present invention has the above-described configuration, and the invention according to the first means has the following effects.
○ Air flow is possible between the inside of the base material that has air permeability and contains antibacterial substances and the space in the air flow path through the interior material of air permeability and heat retention, so the air flow in the air flow path Even when the air flow is stopped, the air in the air channel space flows into the substrate due to the molecular motion of gas molecules and the convection effect due to the temperature difference between the inside and outside of the air channel substrate. Since it returns to the road space, the antibacterial function can be maintained.
Since the antibacterial substance is dispersed in the base material 2, the contact area with air is larger than that when an antibacterial layer is formed on the inner surface of the air flow path, and the antibacterial effect is increased.
O Since the base material 2 containing an antibacterial substance has a heat retaining function, the temperature difference between the inside and outside of the air channel is maintained for a longer time after the cooling and heating operation, and the sterilization effect by the convection action is sustained.

In the invention according to the second means, since the air permeability of the interior material 3 is set within a predetermined range, a sufficient air flow rate is obtained, and when the interior material is formed of fibers or the like, scattering of the fiber waste or the like occurs. There is nothing.

In the invention according to the third means to the fourth means, the base material 2 forming the air flow path is formed of a plurality of layers or a plurality of wall portions, and different antibacterial substances are applied to each adjacent layer or each wall portion. Since they are scattered, the growth of bacteria having resistance to one type of antibacterial substance can be effectively suppressed.

Furthermore, in the invention which concerns on a 4th means, since the distribution | circulation air can equalize the opportunity to contact various antibacterial substances, the antibacterial effect of each antibacterial substance can fully be ensured.

In the invention according to the fifth means, the air duct has the base material 2 and the interior material 3, and the interior material functions as an antibacterial filter for air convection between the air flow path and the base material. Therefore, compared to the case where the antibacterial layer is formed on the inner wall of the non-breathable air passage as in the above-mentioned Patent Document 1, bacteria in the air are more likely to come into contact with the antibacterial substance, and the sterilization function as the entire air passage Will also increase .

According to the sixth means, since the antibacterial substance is scattered throughout the thickness direction of the interior material, the opportunity of contact between the antibacterial substance and the germs increases and the antibacterial action is enhanced.

According to the seventh means, since the air permeability of the interior material 3 is made smaller than the air permeability of the base material 2, the interior air is circulated when the convection air flows between the air flow path 11 and the base material 2. The inside of the material 3 flows slowly, and the antibacterial substance and the germs easily come into contact with the interior of the interior material, so that the antibacterial action is further enhanced.

According to the eighth means, the air permeability of the interior material 3, since was ^{20cm 3 / cm 2 · sec~500 cm} 3 / cm 2 · sec, proper sterilization effect can be obtained.

  1 to 3 show an antibacterial air duct according to a first embodiment of the present invention.

  The air duct 1 </ b> A includes a base material 2, an interior material 3, and an exterior material 4.

  The base material 2 is a thick cylindrical member constituting the peripheral wall of the air duct 1A, is made of a breathable material, and contains an antibacterial substance. The antibacterial substance is preferably uniformly distributed throughout the interior of the base material 2 so that the antibacterial substance and air are in contact with each other throughout the base material 2.

The material of the substrate 2, and then combine the warmth and sound absorption, such as grayed Rasuuru or rock wool, and when formed by amorphous material (such as various fibers) may, interior material and the exterior material below the said workpiece A flexible air duct can be formed by sandwiching between the two. In addition, although the said base material 2 can also be formed with the raw material which has shape retention property, this is mentioned later. Further, the base material 2 may include a component having an aroma effect.

  The thickness of the substrate 2 can be about 10 to 50 mm in order to obtain a contact area between the antibacterial substance and air, but is preferably 20 to 30 mm in consideration of economy.

  Further, as the antibacterial substance, for example, a metal ion carrier (silver zeolite or the like) carrying silver ions, copper ions or the like is suitable. In particular, silver ions have a strong antibacterial action and have a broad antibacterial spectrum that resists many types of bacteria, but some bacteria have resistance to silver ions, so a combination of multiple antibacterial substances is used. May be. This point will be described later in the second and third embodiments. Further, an antibacterial agent using a natural material such as hinokitiol may be used instead of the metal ion.

Interior material 3 and the outer member 4 is formed as a flexible sheet of each inner and outer double tubular, during which both the tubular sheet, the both the tubular sheet when filled and grayed Rasuuru as the substrate 2 The air duct 1A is configured by sealing both end portions. In the illustrated example, both end portions of the air duct are small outer diameter portions as shown in FIG. 1, but such a structure is not necessarily required. Further, the outer surface of the interior material 3 can be adhered to the inner surface of the substrate 2 and the outer surface of the exterior material 4 can be adhered to the outer surface of the substrate 2 with an adhesive or the like.

  As shown in FIG. 2, the interior material 3 is a breathable material (for example, a perforated film, cloth, non-woven fabric, punching, etc.) that allows air to flow between the air flow path 11 inside the interior material 3 and the inside of the base material 2. Plate). In the illustrated example, the air duct according to the present embodiment is deformed into an arbitrary shape by attaching a linear material (for example, a steel wire or a steel strip) 5 in a spiral shape along the interior material 3. And it is set as the flexible air duct which can hold | maintain the shape.

Incidentally, the air permeability of the interior material ^{3, 100cm 3 / cm 2 · sec~250} cm 3 / cm 2 · It is particularly desirable to about sec, typically ^{100cm 3 / cm 2 · sec~2000 cm} 3 It may be in the range of / cm ² · sec. Note that if the air permeability is 100 cm ³ / cm ² · sec or less, it is difficult for air to flow into the substrate 2, and if it is 2000 cm ³ / cm ² · sec or more, fiber scraps are likely to be scattered. In order to realize the air permeability in this range, as is well known in the art, for example, the ratio of the open area ratio may be increased or decreased for a perforated film, and the thickness or the like may be adjusted for a nonwoven fabric or the like. However, when an antibacterial substance is contained in the interior material itself as in the fifth embodiment to be described later, there is sufficient opportunity for contact with germs in the air even if the interior material has an air permeability of 100 cm ³ / cm ² · sec or less. Can be secured. Incidentally, the air permeability of the substrate 2, may be in the range of ^{100cm 3 / cm 2 · sec~4000 cm} 3 / cm 2 · sec in accordance with the air permeability of the interior material.

  The exterior material 4 is formed of a non-breathable material for blocking outflow of air from the air flow path 11 to the outside.

  In the illustrated example, the base material 2 is formed of an irregular material. However, it may be formed of a breathable material such as a foam material or sponge having open cells, and in this case, an air duct is used. It is not always necessary to provide the interior material 3 as means for maintaining the shape.

  In the above configuration, air molecules in the air flow path 11 pass through the interior material 3 due to the diffusion action, flow into the base material 2, contact with the antibacterial substance of the base material, and return to the air flow path 11. Therefore, the sterilization effect can be obtained not only during the air blowing operation but also during the non-air blowing. In particular, after the end of the cold wind operation in summer, the temperature difference between the inside and outside of the air duct 1A often becomes about 13 ° C, and as a result, the air flowing into the base material expands due to the temperature rise and the specific gravity becomes lighter. As shown by the arrows, the base material 2 rises along the inner surface or the inner surface thereof, thereby causing a convection action and thus improving the antibacterial effect. In addition, after the hot air operation in the winter is completed, the air flowing into the base material 2 is cooled, so that convection occurs in the direction opposite to that in FIG. At this time, the base material 2 has a heat retaining function and limits the outflow of heat (cold or warm) from the inside of the air duct 1A due to the convection action, so that the antibacterial action due to the convection action is maintained for a long time.

  Hereinafter, although other embodiment of this invention is described, in the description, the same matter as the structure of 1st Embodiment attaches | subjects the same code | symbol, and shall abbreviate | omit description.

FIG.
Shows an air duct 1A according to a second embodiment of the present invention, wherein the air duct is formed of composite layers 2a and 2b in which the above-described base material 2 is stacked in the radial direction, and different types of antibacterials are provided in each layer. An active substance such as silver ions and copper ions are dispersed. Combinations of antibacterial substances are free, but it is preferable to select ones having different antibacterial spectra and supplementing each other's weak points. In addition, it is assumed that air can freely pass through the boundary between the layers. Further, although the illustrated composite layer has only two layers, it may be three or more layers. In this configuration, part of the air that has flowed into the base material 2 from the air flow path 11 through the interior material 3 flows into the outer layer 2b through the inner layer 2a, and thus is sterilized by the antibacterial substances in both layers. Therefore, it exerts sterilizing action against a wider range of bacteria and sputum.

  FIG. 5 shows an air duct 1A according to a third embodiment of the present invention. The air duct includes a base tube 2 and a first cylinder containing one kind of antibacterial substance (for example, silver ions). The wall portions 2c and second cylindrical wall portions 2d containing other types of antibacterial substances (for example, copper ions) are alternately arranged in the longitudinal direction. In addition, between each adjacent cylinder wall part, the distribution | circulation of air is provided. According to this configuration, air flowing into the cylindrical wall portions 2c and 2d containing various antibacterial substances through the interior material 3 from the air flow path 11 is sterilized and returned to the air flow path 11, so that FIG. As in the case of, it is possible to obtain a combined sterilization action and equalize the opportunity for the circulating air to contact various antibacterial substances, so that the antibacterial effect of each antibacterial substance can be sufficiently secured. it can.

FIG. 6 shows a configuration in which the lining material 1B according to the reference example of the present invention is stuck to the inner surface of the outer wall 22 of the air chamber 21. In the illustrated example, four flat lining materials 1B each having a shape corresponding to the wall portion are stuck to the inner surface of the wall portion excluding the vent holes 23 and 24 in the box-shaped outer wall 22. However, instead of these plate-like lining materials, a lining material 1B formed in a quadrangular cylindrical shape may be integrally formed. The illustrated lining material 1B may be composed of a flat base material 2 and an interior material 3 attached to the inner surface of the base material with an adhesive or the like. The outer surface of the base material 2 is formed by an outer wall 22 of the air chamber. By sealing hermetically, the aforementioned exterior material 4 can be omitted. A part of the outer wall of the air chamber may be omitted, and an exterior material such as an aluminum sheet may be attached to the outer surface of the base material 2 of the lining material 1B corresponding to the omitted portion. Further, instead of the air chamber, the lining material according to the present invention may be provided on the inner surface of an existing square air duct.

  In addition, the said FIG. 4 thru | or FIG.

  In each of the above embodiments, the entire inside of the air flow path is formed by the air flow path forming member of the present application. However, it is not always necessary to do so. A part is formed by a plate-shaped flow passage forming member in which the base material 2 is sandwiched between the interior material 3 and the exterior material 4, and another wall material is formed with an antibacterial layer on the inner surface, for example. It is good as antibacterial wall material.

FIG. 7 shows an enlarged structure of an air duct according to a reference example of the present invention as a longitudinal section viewed from the axial direction. In this embodiment, the antibacterial substance 7 is contained in the interior material 3 instead of the base material 2. The configuration of the entire air duct is the same as that shown in FIGS. In FIG. 7, 6 is a cotton fiber constituting the interior material, and 7 is an antibacterial substance (silver or copper zeolite) contained in the fiber.

  In addition, as a technique for the interior material 3 to contain a large amount of silver zeolite or the like, a method of crystallizing zeolite inside cellulose fibers such as pulp and cotton is conventionally known (Non-patent Document 1 and Patent Document 4). . In this method, the content of zeolite with respect to the weight of the fiber can be set to 30 to 50%.

It is a fragmentary sectional view of the air duct concerning a 1st embodiment of the present invention. It is a partial expanded sectional view of the air duct of FIG. It is a longitudinal cross-section of the air duct of FIG. It is sectional drawing of the air duct which concerns on 2nd Embodiment of this invention. It is sectional drawing of the air duct which concerns on 3rd Embodiment of this invention. It is a cross-sectional view of the structure which made the lining material which concerns on the reference example of this invention stuck to the inner surface of a chamber. It is the expanded sectional view seen from the axial direction of the air duct concerning the reference example of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1A ... Air duct 1B ... Lining material 2 ... Base material 2a ... Inner layer 2b ... Outer layer
2c, 2d ... Wall part 3 ... Interior material 4 ... Exterior material 5 ... Linear material for shape retention 6 ... Fiber 7 ... Antibacterial substance 11 ... Air flow path
21 ... Air chamber 22 ... Outer wall 23, 24 ... Vent

Claims (8)

A base material (2) constituting a duct peripheral wall surrounding the air flow path (11) , an interior material (3) formed of a breathable sheet material thinner than the base material and covering the inner surface of the base material ; An antibacterial air duct formed of a material (2) and a non-breathable exterior material (4) covering the outer surface,
The interior material (3) and the exterior material (4) are each formed as an inner and outer double cylindrical flexible sheet, and between the both cylindrical part sheets, the base material (2) is air permeable and heat-retained. And filling both ends of the cylindrical sheet with a fiber material having properties ,
The air permeability of the base material, has a ^{100cm 3 / cm 2 · sec~4000 cm} 3 / cm 2 · sec,
An antibacterial substance is scattered inside the base material (2), and air is passed through an interior material part that covers the inner surface of the base material between the base material part where the antibacterial substance is disposed and the air flow path (11). Antibacterial air duct, characterized in that it can be distributed . The air permeability of the interior material ^{(3), 100cm 3 / cm} 2 · sec~2000 , characterized in that the cm ³ / cm ² · sec, antibacterial air duct of claim 1, wherein. Said substrate (2), and a stacked composite layer (2a, 2b ...), and wherein the interspersed different types of antibacterial substances in adjacent layers, according to claim 1 or claim Item 3. The antibacterial air duct according to Item 2 . The base material (2) is formed of a plurality of wall portions (2c, 2d...) Continuously arranged in the longitudinal direction of the air flow path, and different types of antibacterial substances are scattered on the adjacent wall portions. The antibacterial air duct according to claim 1 or 2 , characterized by The antibacterial air duct according to claim 1, wherein the interior material (3) contains an antibacterial substance corresponding to the inner surface of the base material (2). Antibacterial substances contained in the interior material (3), as an inorganic antibacterial agent comprising by supporting an antimicrobial metal on the inorganic powder, characterized in that interspersed throughout the thickness direction of the interior material, according to claim 5 Antibacterial air duct as described. The antibacterial air duct according to claim 6 , wherein the air permeability of the interior material (3) is smaller than the air permeability of the base material (2). The air permeability of the interior material (3), characterized in that a ^{20cm 3 / cm 2 · sec~500 cm} 3 / cm 2 · sec, antimicrobial according to any one of claims 5 to 7 Air duct .