JP4359157B2 - Deodorizing apparatus and deodorizing method - Google Patents

Description

  The present invention relates to a deodorizing apparatus used for deodorizing internal air of a sealed device such as a refrigerator, deodorizing indoor air, and the like, and a deodorizing method using the deodorizing apparatus.

As a deodorizing device that forcibly circulates indoor air and deodorizes, for example, a deodorant is carried inside a flow passage having an intake port at one end and a blower port at the other end. A filter member having a disk-like porous body (a three-dimensional network-like porous body having a microporous structure) and further provided with a blowing means is known (see Patent Document 1). According to this deodorizing apparatus, since the odor component is adsorbed by the deodorant when the air sent into the flow passage by the blowing means passes through the filter member, the air from which the odor has been removed can be sent out. .
Japanese Patent Laid-Open No. 5-230 (Claim 1, paragraph 0013, FIG. 1)

  However, in the above-described prior art, the filter member made of a porous body is provided inside the flow passage so as to block the air flow, so that the pressure loss when air passes through the flow passage is large. was there. Thus, when the pressure loss is large, the amount of air that can be deodorized per unit time decreases, and a sufficient deodorizing effect cannot be obtained. Of course, even if the pressure loss is large, it is possible to obtain a certain degree of deodorization effect if the internal capacity of the deodorizer is greatly increased. It cannot be used for actual use.

  Furthermore, there is a problem that the cost required for producing a three-dimensional network porous body having a microporous structure is high.

  The present invention has been made in view of such a technical background, and is capable of reducing pressure loss when air passes through the interior, and is excellent in deodorizing performance that can be easily manufactured and reduced in cost. An object is to provide a deodorizing apparatus and a deodorizing method using the deodorizing apparatus.

  In order to achieve the above object, the present invention provides the following means.

  [1] A vent pipe having a flat cross-sectional shape having vents at both ends, and a deodorizing sheet laminated on at least a part of one of the upper wall and the lower wall of the flat vent pipe, The deodorizing apparatus, wherein a distance between the inner surface of the upper wall and the inner surface of the lower wall is set to 0.25 to 2.5 cm.

  [2] An air pipe having a flat cross-sectional shape having vent holes at both ends, an upper deodorizing sheet laminated on at least a part of an inner surface of the upper wall of the flat air pipe, and at least an inner surface of the lower wall of the flat air pipe A deodorizing sheet comprising a lower deodorizing sheet laminated in part, wherein a spacing between the upper deodorizing sheet and the lower deodorizing sheet is set to 0.25 to 2.5 cm apparatus.

  [3] The deodorizing apparatus according to the above item 2, wherein the upper deodorizing sheet and the lower deodorizing sheet are arranged in an opposing state.

  [4] The deodorizing apparatus according to any one of items 1 to 3, wherein a fibrous sheet having a deodorant attached thereto is used as the deodorizing sheet.

  [5] Of the upper deodorant sheet and the lower deodorant sheet, a fiber sheet to which a deodorant capable of deodorizing an acidic odor is attached is used as one deodorant sheet, and the other deodorant sheet is used. 4. The deodorizing apparatus according to 2 or 3 above, wherein a fibrous sheet to which a deodorant capable of deodorizing a basic odor is attached is used.

  [6] Of the upper deodorant sheet and the lower deodorant sheet, a fiber sheet carrying a metal phthalocyanine complex is used as one deodorant sheet, and a metal phthalocyanine complex is carried as the other deodorant sheet. 4. The deodorizing apparatus according to 2 or 3 above, wherein a fibrous sheet subjected to acid treatment is used.

  [7] The deodorizing apparatus according to item 6, wherein the acid treatment is an acid treatment with a nonvolatile inorganic acid.

  [8] The deodorizing apparatus according to item 7, wherein phosphoric acid and / or sulfuric acid is used as the nonvolatile inorganic acid.

  [9] The deodorizing apparatus according to any one of items 4 to 8, wherein the fibrous sheet is activated carbon mixed paper.

  [10] The deodorization apparatus according to item 9, wherein the activated carbon content in the activated carbon mixed paper is 40 to 85% by mass.

  [11] The deodorizing apparatus according to any one of items 1 to 10, further comprising a blowing unit that sends air into the ventilation pipe.

  [12] Deodorization characterized in that, when performing deodorization using the deodorization device according to any one of items 1 to 11, the ventilation rate in the ventilation pipe is set to 0.8 m / second or more. Method.

  In the invention of [1], the spacing between the upper wall inner surface and the lower wall inner surface of the ventilation pipe is defined in a narrow range of 0.25 to 2.5 cm, so that the air passing through the ventilation pipe is deodorized sheet In this way, the odor is sufficiently deodorized. In addition, since no member (for example, a filter member made of a porous body) that blocks the air flow in the vent pipe is provided, the pressure loss when the air passes through the inside is very small, and thus the compact power consumption is excellent while being compact. Odor efficiency can be ensured. Since it can be made compact in this way, it can be installed in a relatively narrow installation space such as in a refrigerator in a form that does not get in the way, and sufficient deodorization can be performed. Furthermore, since the structure is simple and the manufacture is easy, the cost can be reduced.

  In the invention of [2], the separation distance between the upper deodorizing sheet and the lower deodorizing sheet is defined in a narrow range of 0.25 to 2.5 cm. And it moves while repeating contact with both of the lower deodorizing sheet several times, which makes it possible to sufficiently deodorize. In addition, since no member (for example, a filter member made of a porous body) that blocks the air flow in the vent pipe is provided, the pressure loss when the air passes through the inside is very small, and thus the compact power consumption is excellent while being compact. Odor efficiency can be ensured. Since it can be made compact in this way, it can be installed in a relatively narrow installation space such as in a refrigerator in a form that does not get in the way, and sufficient deodorization can be performed. Furthermore, since the structure is simple and the manufacture is easy, the cost can be reduced.

  In the invention of [3], since the upper deodorizing sheet and the lower deodorizing sheet are arranged to face each other, the air passing through the inside of the vent pipe is in contact with both the upper and lower deodorizing sheets. Since it progresses and the frequency of contact with the deodorant sheet increases in this way, the deodorization efficiency can be improved.

  In the invention of [4], since the fibrous sheet is used as the sheet member of the deodorizing sheet, the contact surface area with the air passing through the inside of the vent pipe can be greatly increased, thereby further improving the deodorizing efficiency. Can be improved.

  In the invention of [5], a fibrous sheet to which a deodorant capable of deodorizing an acidic odor is attached as one of the upper deodorant sheet and the lower deodorant sheet, and the other deodorant is used. Since a fibrous sheet with a deodorant that can deodorize the basic odor is used as the sheet, not only acidic odors such as hydrogen sulfide and methyl mercaptan, but also basic odors such as ammonia and trimethylamine are sufficient. There is an advantage that it can be deodorized, and thus almost all of the odor components can be deodorized.

  In the invention of [6], a fiber sheet carrying a metal phthalocyanine complex is used as one of the upper deodorizing sheet and the lower deodorizing sheet, and a metal phthalocyanine complex is used as the other deodorizing sheet. A fiber sheet that is supported and treated with acid is used, and the former metal phthalocyanine complex-carrying sheet can efficiently deodorize acidic odors such as hydrogen sulfide and methyl mercaptan, while the latter metal phthalocyanine complex is carried. With the sheet (with acid treatment), basic odors such as ammonia and trimethylamine can be efficiently deodorized. Thus, there is an advantage that almost all odor components can be deodorized more efficiently.

  In the invention of [7], since the acid treatment is performed with a non-volatile inorganic acid, the deodorizing effect of the basic odor lasts for a long period of time.

  In the invention of [8], since the acid treatment is performed with phosphoric acid and / or sulfuric acid, the deodorizing effect of the basic odor is sufficiently sustained over a long period of time.

  In the invention of [9], activated carbon mixed paper is used as the fibrous sheet, and the activated carbon can sufficiently exhibit the rapid effect in the deodorizing effect.

  In the invention of [10], since the activated carbon content in the activated carbon mixed paper is specified to be 40 to 85% by mass, sufficient strength as a fibrous sheet is ensured while sufficiently maintaining the rapid effect in the deodorizing effect. be able to.

  In the invention of [11], since air blowing means is provided, air can be sent into the ventilation pipe at a sufficient ventilation speed, and deodorization efficiency can be significantly improved.

  In the invention of [12], since the deodorization is performed by setting the ventilation speed in the ventilation pipe to 0.8 m / second or more, the deodorization can be sufficiently performed.

  A deodorizing apparatus (1) according to an embodiment of the present invention is shown in FIGS. This deodorizing apparatus (1) has an air pipe (2) having vent holes (2a) and (2b) at both ends and a flat rectangular cross section, and an upper side laminated on the inner surface of the upper wall of the air pipe (2). A deodorizing sheet (3) and a lower deodorizing sheet (4) laminated on the inner surface of the lower wall of the vent pipe (2) are provided. And as shown in FIG. 2, the said upper side deodorizing sheet (3) and the lower side deodorizing sheet (4) are arrange | positioned in the state which mutually opposes. Furthermore, as shown in FIG. 1, the ventilation means (5) is arrange | positioned in the vicinity position of the vent hole (2b) of the one end side of the said vent pipe (2). Therefore, the separation interval (K) between the upper deodorizing sheet (3) and the lower deodorizing sheet (4) is set in the range of 0.25 to 2.5 cm (see FIG. 2).

  In this specification, when the cross-sectional shape of the vent pipe is a flat rectangular shape, one of the pair of constituent walls having a shorter facing interval is referred to as an upper wall and the other is referred to as a lower wall. The same applies to the case where the cross-sectional shape of the vent pipe is a substantially rectangular shape or a shape close thereto.

  In the present embodiment, a fibrous sheet (hereinafter referred to as “S-based sheet”) to which a deodorant capable of deodorizing an acidic odor is attached is used as the upper deodorant sheet (3), while the lower deodorant is used. As the sheet (4), a fibrous sheet (hereinafter referred to as “N-based sheet”) to which a deodorant capable of deodorizing a basic odor is attached is used.

  It goes without saying that an N-type sheet may be used as the upper deodorizing sheet (3) and an S-type sheet may be used as the lower deodorizing sheet (4) (reverse arrangement).

  Further, a part of the ventilation pipe (2) on the side of the blowing means (5) is reduced in diameter. That is, the vent (2b) on the side of the air blowing means (5) has an opening area smaller than that of the other air vent (2a), and the air blowing means (5) is arranged so as to face the air vent (2b). Is arranged. In the present embodiment, a fan (fan motor) is used as the air blowing means (5).

  Thus, when the deodorizing device (1) is installed in, for example, a refrigerator or the room and the air blowing means (5) is driven, air passes through the ventilation pipe (2). Since the spacing (K) between the upper deodorant sheet (3) and the lower deodorant sheet (4) is defined in a narrow range of 0.25 to 2.5 cm, the inside of the vent pipe (2) The passing air moves while repeatedly contacting with both the upper S-based sheet (11) and the lower N-based sheet (12), and in such a passing process. Acidic odors such as hydrogen sulfide and methyl mercaptan are sufficiently deodorized by the action of the S-type sheet (11), and basic odors such as ammonia and trimethylamine are also sufficiently deodorized by the action of the N-type sheet (12). Will be.

  In the deodorizing apparatus (1), the separation interval (K) between the upper deodorizing sheet (3) and the lower deodorizing sheet (4) needs to be set to 0.25 to 2.5 cm. If the spacing (K) exceeds 2.5 cm, the contact frequency of the passing air with respect to the deodorizing sheets (3) and (4) is remarkably lowered, and it becomes difficult to perform sufficient deodorization, which is not preferable. On the other hand, if the spacing (K) is less than 0.25 cm, it is not preferable because the pressure loss when air passes through the ventilation pipe (2) increases. Especially, it is preferable to set the space | interval (K) of an upper deodorizing sheet (3) and a lower deodorizing sheet (4) to 0.6-2.1 cm.

  In addition, in the said embodiment, although the structure which has arrange | positioned the deodorizing sheet to both the upper wall inner surface and lower wall inner surface of a vent pipe (2) is employ | adopted, the structure which has arrange | positioned the deodorizing sheet only to the upper wall inner surface. You may employ | adopt or may employ | adopt the structure which has arrange | positioned the deodorizing sheet only to the lower wall inner surface. When adopting such a configuration, it is necessary to set the spacing between the inner surface of the upper wall and the inner surface of the lower wall of the ventilation pipe (2) to 0.25 to 2.5 cm.

  In the present invention, the S-based sheet is not particularly limited, but a fibrous sheet carrying a metal phthalocyanine complex is preferably used. In this case, an acidic odor such as hydrogen sulfide or methyl mercaptan is used. Deodorization is possible with high deodorization efficiency. Among these, it is particularly preferable to use a metal phthalocyanine complex supported on a fibrous sheet in an environment of pH 7.5 to 12.0.

  Further, the N-based sheet is not particularly limited, but it is preferable to use a fibrous sheet on which a metal phthalocyanine complex is supported and subjected to an acid treatment. In this case, ammonia, trimethylamine or the like is used. The basic odor can be deodorized with high deodorization efficiency. Among them, it is particularly preferable to use a metal phthalocyanine complex that has been adjusted to pH 1.5 to 5.0 by further treatment with an acid after it is supported on a fibrous sheet.

The metal phthalocyanine complex is not particularly limited, and examples thereof include a cobalt phthalocyanine complex, an iron phthalocyanine complex, a nickel phthalocyanine complex, and a copper phthalocyanine complex. Among these, it is preferable to use a cobalt phthalocyanine complex or an iron phthalocyanine complex. In this case, the deodorization efficiency can be further improved. Examples of the cobalt phthalocyanine complex include sodium cobalt phthalocyanine polysulfonate and sodium cobalt phthalocyanine tetracarboxylate, and examples of the iron phthalocyanine complex include sodium iron phthalocyanine octacarboxylate. The supported amount of the metal phthalocyanine complex is preferably set to 0.001 to 0.05 g / m ² .

  Examples of the acid used for the acid treatment include organic acids and inorganic acids. Among these, it is preferable to use a non-volatile inorganic acid. In this case, the deodorizing effect of the basic odor lasts for a long time. As the non-volatile inorganic acid, it is particularly preferable to use phosphoric acid or / and sulfuric acid.

  The acid treatment technique is not particularly limited, and examples thereof include dipping treatment such as dipping or print treatment such as gravure printing and flexographic printing.

  Although it does not specifically limit as said fibrous sheet, For example, paper, a nonwoven fabric sheet, a woven fabric sheet, a knitted fabric sheet etc. are mentioned. Among them, it is preferable to use activated carbon mixed paper as the fibrous sheet. In this case, the presence of the activated carbon can provide a deodorizing effect excellent in rapid effect.

The activated carbon content in the activated carbon mixed paper is preferably set to 40 to 85% by mass. If the amount is less than 40% by mass, it is not preferable because a quick deodorizing effect cannot be obtained sufficiently. On the other hand, if it exceeds 85% by mass, the strength as a mixed paper cannot be obtained sufficiently. Among them, the activated carbon content in the activated carbon mixed paper is more preferably set to 50 to 80% by mass. The activated carbon is not particularly limited, and any type and form can be used. The basis weight of the activated carbon mixed paper is preferably set in the range of 30 to 200 g / m ² .

  In the embodiment, the upper S-type sheet (11) and the lower N-type sheet (12) are arranged so as to face each other almost completely (see FIG. 2). In particular, the arrangement is not limited to such an arrangement. For example, as shown in FIG. 3, the upper S-type sheet (11) and the lower N-type sheet (12) are partially opposed to each other. It may be arranged. In addition, as shown in FIG. 4, the S-based sheets (11) and the N-based sheets (12) are alternately arranged on the inner surface of the upper wall of the ventilation pipe (2), while the N-based sheet (12) is disposed on the inner surface of the lower wall. And S-type sheet (11) are alternately arranged, so that the S-type sheet (11) and the N-type sheet (12) are arranged in an opposed state so as to face each other at almost any position. You can also

  Moreover, in the said embodiment, although the deodorizing sheet is not laminated | stacked on the side wall of the vent pipe (2), a deodorizing sheet, such as S type | system | group sheet | seat (11) and N type | system | group sheet | seat (12), is provided also to this side wall. You may do it.

  The deodorizing apparatus (1) according to the present invention can be installed and used, for example, in a refrigerator or indoors, or can be installed and used in an indoor air conditioning duct or an air conditioner outlet. In the latter case, it is needless to say that the air blowing means (5) is not particularly necessary, but the air blowing means (5) is used when sufficient air movement is ensured even when installed indoors. It is not necessary to provide it.

  When performing deodorization using the deodorization apparatus (1) of the present invention, it is preferable to set the ventilation speed in the ventilation pipe (2) to 0.8 m / second or more. Thereby, even if the space volume of the object to be deodorized is large, it becomes possible to sufficiently deodorize. Especially, it is preferable to set the ventilation speed in the said ventilation pipe (2) to 1.0 m / sec or more.

  Next, specific examples of the present invention will be described.

<Constituent materials>
“S-based sheet”: Activated carbon mixed paper with a basis weight of 65 g / m ² (containing 70% by mass of powdered coconut shell activated carbon, the content of paper mainly composed of cellulose fibers is 30% by mass) The chemical treatment agent (water 1000 g, sodium hydroxide 3.5 g, 3-chloro-2-hydroxypropyltrimethylammonium chloride 10.0 g) was applied at a wet mass of 20 g / m ² using a gravure printing machine, and then dried. . Next, a deodorant-containing liquid (water 1000 g, sodium hydroxide 5.0 g, cobalt phthalocyanine polysulfonate sodium 5.0 g) is wet-massed on the surface of the cationized activated carbon mixed paper using a gravure printing machine. After applying at 20 g / m ^2, it was obtained by drying. The thickness of this S-type sheet was 0.2 mm.

“N-based sheet”: an activated carbon mixed paper having a basis weight of 65 g / m ² (containing 70% by mass of powdered coconut shell activated carbon, the content of paper mainly consisting of cellulose fibers is 30% by mass) The chemical treatment agent (water 1000 g, sodium hydroxide 3.5 g, 3-chloro-2-hydroxypropyltrimethylammonium chloride 10.0 g) was applied at a wet mass of 20 g / m ² using a gravure printing machine, and then dried. . Next, a deodorant-containing liquid (water 1000 g, sodium hydroxide 5.0 g, cobalt phthalocyanine polysulfonate sodium 5.0 g) is wet-massed on the surface of the cationized activated carbon mixed paper using a gravure printing machine. After coating at 20 g / m ^2, it was dried. Further, by applying an acid treatment liquid (980 g of water, 20 g of phosphoric acid) in a wet mass of 20 g / m ² using a gravure printing machine on the surface of the activated carbon mixed paper to which the deodorant is adhered, and then drying. Obtained. The N-type sheet had a thickness of 0.2 mm.

<Example 1>
1. Adhere the S-type sheet to the entire inner surface of the upper wall of the vent pipe having the structure shown in FIG. 1 (the main part excluding the right-side reduced diameter part is 15 cm wide × 1.5 cm high × 35 cm deep). On the other hand, the N-based sheet is adhered to the entire inner surface of the lower wall, and a blower fan is disposed in a manner facing the reduced diameter opening in the vicinity of the reduced diameter opening of the vent pipe, thereby removing the deodorizing device. Produced (see FIG. 1). The spacing (K) between the S-based sheet and the N-based sheet was 1.0 cm.

<Example 2>
The S-type sheet is attached to the entire inner surface of the upper wall of the ventilation pipe having the structure shown in FIG. 1 (the main portion excluding the right-side reduced diameter portion is 15 cm wide × 2.0 cm high × 35 cm deep). On the other hand, the N-based sheet is adhered to the entire inner surface of the lower wall, and a blower fan is disposed in a manner facing the reduced diameter opening in the vicinity of the reduced diameter opening of the vent pipe, thereby removing the deodorizing device. Produced (see FIG. 1). The spacing (K) between the S-based sheet and the N-based sheet was 1.5 cm.

<Example 3>
The above-mentioned S-based sheet is attached to the entire inner surface of the upper wall of the vent pipe having the structure shown in FIG. 1 (the main portion excluding the right-side reduced diameter portion is 15 cm wide × 2.5 cm high × 35 cm deep). On the other hand, the N-based sheet is adhered to the entire inner surface of the lower wall, and a blower fan is disposed in a manner facing the reduced diameter opening in the vicinity of the reduced diameter opening of the vent pipe, thereby removing the deodorizing device. Produced (see FIG. 1). The spacing (K) between the S-based sheet and the N-based sheet was 2.0 cm.

<Comparative Example 1>
The S-based sheet is attached to the entire inner surface of the upper wall of the vent pipe having the structure shown in FIG. 1 (the main portion excluding the right-side reduced diameter portion is 15 cm wide × 3.5 cm high × 35 cm deep). On the other hand, the N-based sheet is adhered to the entire inner surface of the lower wall, and a blower fan is disposed in a manner facing the reduced diameter opening in the vicinity of the reduced diameter opening of the vent pipe, thereby removing the deodorizing device. Produced (see FIG. 1). The spacing (K) between the S-based sheet and the N-based sheet was 3.0 cm.

<Comparative example 2>
The S-based sheet is attached to the entire inner surface of the upper wall of the vent pipe having the structure shown in FIG. 1 (the main portion excluding the right-side reduced diameter portion is 15 cm wide × 0.7 cm high × 35 cm deep). On the other hand, the N-based sheet is adhered to the entire inner surface of the lower wall, and a blower fan is disposed in a manner facing the reduced diameter opening in the vicinity of the reduced diameter opening of the vent pipe, thereby removing the deodorizing device. Produced (see FIG. 1). The spacing (K) between the S-based sheet and the N-based sheet was 0.2 cm.

  The deodorizing performance of each deodorizing device manufactured as described above was evaluated according to the following test method. The results are shown in the table.

<Deodorization performance test method>
(Methyl mercaptan deodorization performance)
After installing a deodorizing device on the inner surface of the bottom wall of an acrylic box having an internal volume of 1 m ³ , methyl mercaptan gas was injected so that the concentration would be about 7 to 11 ppm in the box. Immediately after the injection, the blower fan was driven to set the ventilation speed in the ventilation pipe to 1 m / second. After the injection, the residual concentration of methyl mercaptan gas was measured every predetermined time, and the methyl mercaptan gas residual rate (%) was calculated from the measured value. The air in the acrylic box was set to 20 ° C. and 85% RH.

(Trimethylamine deodorization performance)
Except for injecting trimethylamine instead of methyl mercaptan gas, the residual ratio (%) of trimethylamine gas was calculated every predetermined time after injection in the same manner as in the above test.

<Example 4>
Using the deodorizing apparatus of Example 3, the deodorizing performance was evaluated in the same manner as in the above deodorizing performance test, except that the ventilation rate in the vent pipe was set to 2.0 m / sec.

<Example 5>
Using the deodorizing apparatus of Example 3, the deodorizing performance was evaluated in the same manner as in the above deodorizing performance test, except that the ventilation rate in the vent pipe was set to 0.5 m / sec.

  As is clear from Tables 1 and 2, the deodorizers of Examples 1 to 5 according to the present invention sufficiently deodorize both methyl mercaptan gas, which is an acidic odor, and trimethylamine gas, which is a basic odor, in a short time. We were able to. Moreover, the deodorizing apparatus of Examples 1-4 which set the ventilation | gas_flowing speed in a ventilation pipe | tube to 0.8 m / sec or more was able to perform sufficient deodorization in a still shorter time.

  On the other hand, in the deodorizing apparatus of Comparative Example 1 in which the separation distance between the S-based sheet and the N-based sheet deviates from the specified range of the present invention, methyl mercaptan gas that is an acidic odor, trimethylamine gas that is a basic odor None of them could be sufficiently deodorized.

It is a perspective view which shows one Embodiment of the deodorizing apparatus of this invention. It is sectional drawing of the AA in FIG. It is sectional drawing which shows the modification of a deodorizing apparatus. It is sectional drawing which shows the other modification of a deodorizing apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Deodorizing apparatus 2 ... Vent pipe 2a, 2b ... Vent 3 ... Upper deodorizing sheet 4 ... Lower deodorizing sheet 5 ... Blower means 11 ... The fiber sheet which attached the deodorizer which can deodorize acidic odor (S system sheet)
12 ... A fibrous sheet (N-based sheet) to which a deodorant capable of deodorizing a basic odor is attached

Claims (11)

A vent pipe having a flat cross-sectional shape with vents at both ends;
A deodorizing sheet adhered to at least a part of the inner surface of either one of the upper wall and the lower wall of the flat vent pipe ;
It is arranged in a mode facing the vent on one end side of the vent pipe, and includes a blower fan that sends air into the vent pipe ,
The ventilation fan side vent has a smaller opening area than the other vent,
The deodorizing apparatus, wherein a distance between the inner surface of the upper wall and the inner surface of the lower wall is set to 0.25 to 2.5 cm. A vent pipe having a flat cross-sectional shape with vents at both ends;
An upper deodorizing sheet adhered to at least a part of the inner surface of the upper wall of the flat ventilation tube;
A lower deodorizing sheet attached to at least a part of the inner surface of the lower wall of the flat vent pipe ;
It is arranged in a mode facing the vent on one end side of the vent pipe, and includes a blower fan that sends air into the vent pipe ,
The ventilation fan side vent has a smaller opening area than the other vent,
The deodorizing apparatus, wherein a separation distance between the upper deodorizing sheet and the lower deodorizing sheet is set to 0.25 to 2.5 cm.   The deodorizing apparatus according to claim 2, wherein the upper deodorizing sheet and the lower deodorizing sheet are arranged in an opposing state.   The deodorizing apparatus according to any one of claims 1 to 3, wherein a fibrous sheet having a deodorant attached thereto is used as the deodorizing sheet.   Of the upper deodorant sheet and the lower deodorant sheet, a fiber sheet to which a deodorant capable of deodorizing an acidic odor is attached is used as one deodorant sheet, and a basic odor is used as the other deodorant sheet. The deodorizing apparatus according to claim 2 or 3, wherein a fibrous sheet to which a deodorizing agent capable of deodorizing is attached is used.   Of the upper deodorant sheet and the lower deodorant sheet, a fiber sheet carrying a metal phthalocyanine complex is used as one of the deodorant sheets, and a metal phthalocyanine complex is carried as the other deodorant sheet and an acid. The deodorizing apparatus according to claim 2 or 3, wherein a treated fiber sheet is used.   The deodorizing apparatus according to claim 6, wherein the acid treatment is an acid treatment with a non-volatile inorganic acid.   The deodorizing apparatus according to claim 7, wherein phosphoric acid and / or sulfuric acid is used as the nonvolatile inorganic acid.   The deodorizing apparatus according to any one of claims 4 to 8, wherein the fibrous sheet is activated carbon mixed paper.   The deodorizing apparatus according to claim 9, wherein the activated carbon content in the activated carbon mixed paper is 40 to 85 mass%. A deodorizing method characterized in that, when deodorizing is performed using the deodorizing apparatus according to any one of claims 1 to 10 , an aeration speed in the vent pipe is set to 0.8 m / second or more.

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