JP2000167333A - Air purifier - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an air purifier capable of efficiently removing various malodors or harmful substances in the air inclusive of gaseous water-soluble substances. SOLUTION: A wet type removing mechanism 22 for removing a water soluble contaminant is provided in addition to a dry type removing mechanism 21 for removing a gaseous malodor or harmful substance in the air. The wet type removing mechanism 22 is constituted of a water film filter 7 and dehumidifying part 8 provided therebehind. The water film filter 7 is constituted by adding water or a natural plant extract compounded with an antibacterial agent having antibacterial and sterilizing effect and containing many kinds of acidic, neutral and basic moistures and a reducing agent such as ascorbic acid or the like to a glass fiber sheet or a sheet containing a water absorbent such as a highly water absorbable polymer.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air purifying device, and relates to an efficient, safe and reliable removal of various kinds of particulate and gaseous odorous substances and harmful substances in the air using a water film. To remove mainly gaseous water-soluble contaminants which have been difficult to remove so far.

[0002]

2. Description of the Related Art In a conventional air purifying apparatus, an adsorbing method mainly using an activated carbon or the like, an ozone oxidizing method in which an oxidation reaction is promoted by ozone, and a titanium oxide around a light source are mainly used for removing gaseous odorous substances and harmful substances. A dry removal mechanism such as a titanium oxide photocatalyst system that uses a membrane to extend the life of the sterilization / deodorization function is used.

[0003] Adsorbents such as activated carbon have the property of immediately adsorbing and removing various hydrophobic contaminants.
However, although the adsorption is fast, when the adsorption reaches saturation, it cannot be used any more, and there is a disadvantage that maintenance is troublesome.

Further, in order to compensate for this drawback and enhance the sterilization / deodorization function and extend the life, a removal mechanism using a photocatalyst in combination with an adsorbent using a photocatalyst technique is also used (for example, Japanese Unexamined Patent Publication (Kokai) No. Heisei 9 (1994) -208). 10-33653, JP-A-10-118519).

However, the photocatalyst has a specific wavelength (180 nm).
m to 420 nm), the effect is exhibited. If the dirt is deposited and the light does not reach the surface of the titanium oxide catalyst, no decomposition reaction occurs. In addition, at present, even if the conditions for sufficiently exhibiting the performance are satisfied, the decomposition reaction of the titanium oxide photocatalyst occurs gradually, and all the substances that are brought into contact with the surface of the titanium oxide photocatalyst by the adsorbent or the like are removed. It does not break down immediately. Furthermore, various intermediate products are released by the decomposition mechanism, and safety issues have been pointed out.

Similarly, a cleaning device using ozone (for example, Japanese Patent Application Laid-Open No. 9-206558, Japanese Patent Application Laid-Open
No. 749) can also immediately decompose odors and the like in the presence of high-concentration ozone, but the ozone concentration must be controlled so that the ozone concentration in the discharged air is 0.05 ppm or less. There remain security concerns.

As described above, in any of the prior arts, the removal of gaseous malodorous substances and harmful substances in the air requires
There was a problem in terms of performance life and safety, and not all substances had an effect of removing all substances.

[0008]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide various kinds of malodorous substances including gaseous water-soluble substances and harmful substances in the air, which are difficult to remove with a conventional air purifier. It is an object of the present invention to provide an air purifying apparatus which can remove odors continuously and efficiently for a long time without any maintenance, and has excellent characteristics in terms of economy, safety, durability and the like.

[0009]

SUMMARY OF THE INVENTION An air purifying apparatus according to the present invention includes a wet type removing mechanism for removing water-soluble contaminants in addition to a dry type removing mechanism for removing gaseous malodorous substances and harmful substances in the air. By providing a removing mechanism, the above object is achieved.

If a dehumidifying section is provided in the wet removing mechanism, the humidity can be adjusted, and the water-soluble odor component and harmful substances can be removed together with the moisture.

[0011] The wet removal mechanism is to mix an antibacterial agent having an antibacterial and bactericidal effect into a glass fiber sheet or a sheet containing a water-absorbing agent such as a highly water-absorbing polymer so that the acidic, neutral, or basic It is preferable to use a water membrane filter containing various kinds of water, water containing a reducing agent such as ascorbic acid, or a natural plant extract.

[0012]

Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows an overall schematic configuration of an air cleaning device according to the present invention.

In FIG. 1, a dust filter 2, a dust collector 3, an adsorbent filter 4, a photocatalyst filter 5, and a light source (ultraviolet lamp) are provided in an air passage from an inlet 1 to an outlet 10.
6, a water film filter 7, a dehumidifying unit 8, and a blower fan 9 are sequentially arranged. The dust removing filter 2, the dust collecting section 3, the adsorbent filter 4, the photocatalyst filter 5, the light
Constitutes a dry removal mechanism 21, and the water film filter 7 and the dehumidifying section 8 constitute a wet removal mechanism 22.

Here, the dust removing filter 2 and the dust collecting section 3
Is a particulate matter removing mechanism 31 for mainly removing particulate matter.
The adsorbent filter 4, the photocatalyst filter 5, the light source 6, the water film filter 7, and the dehumidifying section 8 constitute a gaseous substance removing mechanism 32 for mainly removing gaseous substances.

The adsorbent filter 4 is made of activated carbon, zeolite or the like capable of adsorbing odorous components. The photocatalyst filter 5 irradiates ultraviolet rays from the light source 6 to purify contaminants such as odor components, and serves as a dry deodorizing unit together with the adsorbent filter 4. The adsorbent filter 4 and the photocatalyst filter 5 are not separately provided, but may be a filter in which an adsorbent and a photocatalyst are kneaded. The filter shape is desirably a honeycomb-shaped corrugated type from the viewpoint of suppressing pressure loss, but is not limited thereto.

Here, the photocatalyst means a substance that absorbs light and gives the energy to a reactant to cause a chemical reaction. Specifically, upon irradiation with light including ultraviolet rays, holes generated on the surface of the photocatalyst react with water adsorbed on the surface of the photocatalyst to form radical OH (hydroxyl radical)
Is generated, and the radical OH breaks the molecular bond of the organic substance, thereby deodorizing an odor component such as ammonia.

Further, as the photocatalyst, may be used titanium dioxide (Ti0 ₂₎ and zinc oxide (ZnO) and tungsten trioxide having a crystal structure of anatase type, it is preferable to particularly use a titanium dioxide.
Because, in the case of titanium dioxide, sufficient deodorizing function can be exerted even with weak ultraviolet rays, and a wide range of odorous substances, such as ammonia, acetaldehyde, acetic acid, trimethylamine, methyl mercaptan, hydrogen sulfide, styrene,
This is because malodor such as methyl sulfide, dimethyl disulfide and isovaleric acid can be removed.

As the light source 6, a cold-cathode fluorescent lamp, a germicidal lamp, a black light, or the like is preferable in terms of cost, performance life, and the like. Light having a wavelength of 420 nm or less is emitted from the Ti
0 ₂ and activate the photocatalyst such as ZnO (excitation) by efficiently contaminants can be purified. Among ultraviolet rays generated from the ultraviolet lamp, ultraviolet rays having a wavelength of 200 nm or less, particularly ultraviolet rays having a wavelength of 185 nm, convert oxygen in the atmosphere into ozone to generate an ozone atmosphere, and this ozone reduces harmful substances in the gas. Partially oxidized and rendered harmless.

Further, ultraviolet rays having a wavelength of 230 to 270 nm, particularly ultraviolet rays having a wavelength of 245 nm, not only have a function of acting on ozone to convert it into oxygen and radical oxygen, but also have a bactericidal effect against bacteria and the like contained in the gas. . Radical oxygen acts as a much stronger oxidizing agent than ozone, and harmful substances are efficiently detoxified by contact with radical oxygen.

The wet removal mechanism 22 provided with the water film filter 7 and the dehumidification unit 8 disposed on the rear side of the dry removal mechanism 21 removes mainly water-soluble contaminants that cannot be removed by the dry removal mechanism 21 and removes photocatalysts. The purpose is to remove intermediate products reacted by ultraviolet rays.

The water membrane filter 7 is made by mixing an antibacterial agent having an antibacterial and bactericidal effect into a glass fiber sheet or a sheet containing a water-absorbing agent such as a highly water-absorbing polymer. ), Water containing a reducing agent such as ascorbic acid, or a natural plant extract. By causing the contaminants in the air to efficiently contact the water film of the water film filter 7, the water-soluble contaminants that could not be removed by the dry removal mechanism 21 are taken into the water and removed.

The water membrane filter 7 has a structure in which various acidic, neutral, and basic (alkaline) chemicals, water containing a reducing agent such as ascorbic acid, or a natural plant extract can be constantly supplied from a tank. To Natural plant extracts include cedar family, cypress family, pinaceae, birch family, nettle family, camphoraceae family, beech family, citrus family, oyster family, perilla family, chestnut family, aster family, gramineae family, lily family, amaryllidaceae At least one type of composition selected from extracts of plant tissues of the family and the like. Among them, pine, hiba,
Extracts from conifers such as cedar and cypress have excellent deodorizing effects. In addition, a so-called forest bathing effect can be expected, and it will be possible to meet the needs of health promotion.

The dehumidifying section 8 has a dehumidifying filter such as zeolite or a cooling type dehumidifying structure, adjusts humidity, and removes water-soluble odor components and harmful substances together with water.

[0024]

As described above, the adsorption method using an adsorbent such as activated carbon, the ozone oxidation method that promotes the oxidation reaction by ozone, and the titanium oxide film disposed around the light source to extend the life of the sterilization and deodorization functions. When the treatment is performed only by a dry removal mechanism such as a titanium oxide photocatalyst method, it is difficult to remove water-soluble harmful substances, but according to the invention according to claim 1, water-soluble harmful substances can also be removed. Therefore, an air purifying device that can efficiently remove a wider range of malodorous substances and harmful substances than conventional ones and has excellent characteristics in terms of economy, safety, durability and the like can be obtained. .

According to the second aspect of the present invention, since the dehumidifying section is provided in the wet type removing mechanism, the humidity can be adjusted and the water-soluble odor component and harmful substances can be removed together with the water.

According to the third aspect of the present invention, a wide range of malodorous substances and harmful substances can be removed continuously and efficiently over a long period of time without maintenance, and there is an effect of promoting health.

[Brief description of the drawings]

FIG. 1 is an overall schematic configuration diagram of an air cleaning device according to the present invention.

[Description of Signs] 1 Suction port 2 Dust removal filter 3 Dust collection unit 4 Adsorbent filter 5 Photocatalytic filter 6 Light source (ultraviolet lamp) 7 Water film filter 8 Dehumidification unit 9 Ventilation fan 10 Outlet 21 Dry removal mechanism 22 Wet removal mechanism 31 Particulate matter removal mechanism 32 Gaseous matter removal mechanism

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) A61L 9/16 A61L 9/16 DF 9/18 9/18 B01D 47/00 B01D 47/00 D 53 / 86 53/36 JHF term (reference) 4C080 AA05 AA06 AA07 BB02 CC02 CC03 CC04 CC05 CC08 CC09 HH05 JJ06 KK10 LL02 LL10 MM01 MM12 MM31 NN01 NN22 QQ11 4D020 AA09 BA19 BA30 BB03 BB07 CD02 AB02 CD02 AB02 BA03 BA05 BB08 DA01 4D048 AA22 AB03 BA05X BA07X BA11X BA13X BA16X BA27X BA41X CC40 CD02 CD05 EA01 EA04

Claims (3)

[Claims] 1. In addition to a dry removal mechanism for removing gaseous malodorous substances and harmful substances in the air, a wet removal mechanism for removing water-soluble contaminants is provided.
Air purifier. 2. The air purifying apparatus according to claim 1, wherein a dehumidifying section is provided in the wet removing mechanism. 3. The wet removal mechanism comprises mixing an antibacterial agent having an antibacterial and bactericidal effect into a glass fiber sheet or a sheet containing a water-absorbing agent such as a superabsorbent polymer. A water membrane filter containing a water containing various kinds of water, a reducing agent such as ascorbic acid, or a natural plant extract or the like, characterized in that it is provided with a water membrane filter. Air purifier.