JP2002177373A - Air cleaner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize an air cleaner by which cleaning and regeneration of a contaminated gas contaminated with volatile organic compounds such as e.g. odors in living environments and aldehydes generated from building materials, walls and furnitures can be performed by thrift of electric power. SOLUTION: The air cleaning apparatus is characterized by providing a housing 1 forming a passage 1a for cleaned air, a dust collecting filter 3 installed on the upstream side in the housing 1 and catching dust included in the air and a cleaning filter 4 installed on the downstream side of this dust collecting filter 3 and for cleaning objective substances to be removed by means of corona discharge and decomposing them by using an oxidation catalyst and arranging the cleaning filter 4 in such a way that it has a facing electrode 41 and a discharging electrode 42 and dielectric pellets 44 and catalyst-carrying dielectric pellets 45 are filled in a space between these electrodes 41 and 42 and an air passage 4a is formed and an air containing the objective substances to be removed is made to flow in this air passage 4a.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air purifying apparatus, and more particularly to various odors and volatile organic compounds caused by exhaust gas generated in a living environment and an automobile interior from indoor and outside air. The present invention relates to air purification of gaseous pollutants contained in air such as VOCs and formaldehyde.

[0002]

2. Description of the Related Art A conventional air purifying apparatus of this type is disclosed in Japanese Patent Application Laid-Open No. 2000-15036. According to this publication, trapping means for adsorbing contaminant gases such as odors in the air and volatile organic compounds such as aldehydes generated from building materials, walls and furniture are disposed inside the purification air passage, and disposed below the trapping means. A heating means for heating the trapped means and desorbing the contaminated gas adsorbed thereon, and a decomposition means comprising a porous multi-layer structured catalyst for decomposing the desorbed contaminated gas disposed above the trapping means. Have been. The decomposition means has a multilayer structure of a porous catalyst body carrying a catalyst. The lowermost layer is a porous catalyst body and functions as an electric heating element.

[0003] Two operation modes, an adsorption mode operation for purifying indoor contaminated air and a regeneration mode operation for desorbing and decomposing adsorbed pollutant gas, are performed to remove contaminants and regenerate the trapping means. It is what you do.

[0004]

However, in the above publication, in the regeneration mode operation, the heating means is operated to desorb the adsorbed trapping means, and the desorbed pollutant gas is accelerated by the decomposing means to promote oxidative decomposition. Therefore, the operation of the electric heating element requires a large amount of power consumption.

[0005] An electric precipitator for removing dust in the air without using a heating means is also known. Generally, an electric precipitator is provided with a discharge electrode and a counter electrode, and air passing between these electrodes is generally provided. Particles charged by charging fine particles therein are not suitable for purifying gaseous substances having a small molecular weight such as aldehydes.

Accordingly, an object of the present invention has been made in view of the above points. For example, odors and building materials in a living environment,
It is an object of the present invention to provide an air purifying apparatus capable of purifying and regenerating pollutant gases such as volatile organic compounds such as aldehydes generated from walls and furniture with low power consumption.

[0007]

In order to achieve the above object, the technical means according to claims 1 to 7 are employed. That is, in the first aspect of the present invention, the casing (1) forming the purified air passage and the trapping filter (10) installed on the upstream side in the casing (1) and trapping dust and dust contained in the air. 3) and air purifying means (4) installed downstream of the trapping filter (3) for purifying the substance to be removed by corona discharge or creeping discharge and decomposing it by an oxidation catalyst,
The air purifying means (4) has a counter electrode (41) and a discharge electrode (42), and a catalyst supporting or a catalyst layer is formed in a space formed by these electrodes (41, 42). It is characterized in that the member (45) is filled and an air passage (4a) is formed so that air containing the substance to be removed flows into the air passage (4a).

According to the first aspect of the present invention, particulate matter such as dust and dirt in the air is captured by the capture filter (3), and the odor in the smoke of cigarettes is provided downstream of the capture filter (3). Air purifying means (4) for removing gaseous substances such as acetaldehyde gas, ammonia gas, acetic acid gas, formaldehyde gas and volatile organic compounds (VOC) which are components of the air purifying means (4) In
The space formed by the counter electrode (41) and the discharge electrode (42) is filled with a dielectric member (45) carrying a catalyst or having a catalyst layer formed thereon, and an air passage (4).
a) is formed, a discharge is generated in the air passageway (4a) by applying a high voltage to the discharge electrode (42), and the noble metal and metal oxide catalyst and active oxygen are generated by the discharge energy to generate a gas. Adsorption and oxidation of particulate matter,
Decomposition can be performed.

Generally, a purifying apparatus that adsorbs and desorbs and oxidizes these gaseous substances requires large heat energy such as heating. For example, corona discharge or creeping discharge requires low energy. Can respond,
Power consumption can be reduced as compared with the related art, and power consumption is reduced.

In addition, since the operation mode is such that oxidation and decomposition are performed while purifying by corona discharge and creeping discharge, the regeneration operation mode does not need to be set, and a control device having a simple structure can cope with the cost reduction. We can provide products.

The discharge electrode (42) and the counter electrode (4)
The space formed by 1) is filled with a dielectric member (44) supporting a catalyst or forming a catalyst layer to form an air passage (4a), whereby the air passage (4a) is narrowed and a gaseous substance is formed. Purification efficiency is higher than that of a general electrostatic filter or the like having a space between a general discharge electrode (42) and a counter electrode (41) as an air passage due to an increase in the contact efficiency between electrons and electrons by discharge. Can be provided.

According to the second aspect of the present invention, the counter electrode (41)
Are formed in a substantially cylindrical shape, and the discharge electrode (42) is provided so as to face the substantially concentric axis of the counter electrode (41).

According to the second aspect of the present invention, by forming the discharge electrode (42) on the coaxial line of the cylindrical counter electrode (41), the electric charge is concentrated on the counter electrode (41) and the spark discharge is generated. Occurrence can be prevented, the discharge between the dielectric members (45) can be made uniform, and the purification performance can be improved.

According to the third aspect of the present invention, a substantially cylindrical insulator tube (43) is provided on the inner peripheral side of the counter electrode (41).
, And is insulated from the dielectric member (45) on which the catalyst is supported or on which the catalyst layer is formed.

According to the third aspect of the present invention, the opposing electrodes (4
By interposing an insulator tube (43) on the inner peripheral side of 1),
It is possible to prevent electric charges from concentrating on the counter electrode (41) and prevent a spark discharge from occurring, so that the discharge between the dielectric members (45) can be made uniform and the purification performance can be improved.

According to the fourth aspect of the present invention, the air purifying means (7)
Has a laminated structure of a plurality of air purification layers (70),
Each of the air purification layers (70) has a discharge electrode (72) and a counter electrode (71) facing the discharge electrode (72), and is provided in a space formed by these electrodes (71, 72). A dielectric member (74) carrying a catalyst or forming a catalyst layer is provided, and an air passage (7a) is provided in the vicinity of the catalyst, and the air containing the substance to be removed flows through the air passage (7a). It is characterized by having been constituted as follows.

According to the fourth aspect of the present invention, in the air purification means (4), each of the air purification layers (70) includes a discharge electrode (72), a catalyst, a dielectric member (74), and a counter electrode (7).
By forming the air passage (7a) between the discharge electrode (72) and the catalyst by integrally forming according to 1), for example, a corona discharge or a creeping discharge is generated in the air passage (7a). Adsorption, oxidation and decomposition of gaseous substances can be performed by the generation of active oxygen by the catalyst and discharge energy.

Further, by laminating a plurality of the air purifying layers (70) and forming a plurality of air passages (7a), it is possible to provide an air purifying apparatus having a purifying ability larger than that of the first aspect.

According to the fifth aspect of the present invention, the air purifying means (7)
Has a laminated structure of a plurality of air purification layers (70),
Each of the air purification layers (70) has a discharge electrode (72) and a counter electrode (71) facing the discharge electrode (72). Is formed, a dielectric member (74) is provided in a space formed by these electrodes (71, 72), and an air passage (7a) is provided near the catalyst, and an air passage (7a) is provided in the air passage (7a). It is characterized in that it is configured to flow air containing the substance to be removed.

According to the invention of claim 5, the discharge electrode (7)
2) A catalyst is supported or a catalyst layer is formed on the outer surface, and an air passage (7a) is provided in the vicinity of the catalyst to generate a discharge in the air passage (7a) by, for example, corona discharge or creeping discharge. Thus, gaseous substances can be adsorbed, oxidized and decomposed by the generation of active oxygen by the catalyst and discharge energy.

According to the sixth aspect of the present invention, the discharge electrode (72)
Is formed in any of a vertical stripe, a horizontal stripe, a lattice, a mesh, or a metal wool, and is discharged toward the catalyst by a plurality of discharge electrodes (72). .

According to the invention of claim 6, specifically, by forming the discharge electrode (72) in the above-described shape, the discharge can be generated in the entire air passage (7a), thereby improving the purification ability. I can do it. In particular, by forming a metal wool shape, the discharge electrode (72) can have many discharge sites, so that the size of the air purification means (7) can be reduced.

According to the seventh aspect of the present invention, the dielectric member (45, 7
4) is characterized in that a catalyst is carried or a catalyst layer is formed on a fibrous member (74a) formed in a corrugated form using a fibrous material.

According to the seventh aspect of the present invention, the dielectric member (4
5 and 74) by using a fibrous member (74a) formed into a corrugated shape using a fibrous material, thereby providing an air passage (7a).
And the fiber member (74a)
Since the corona discharge is performed in the air passage (7a) near the catalyst, the purifying ability is excellent.

According to the eighth aspect of the present invention, the dielectric member (45, 7)
4) is characterized in that a catalyst is supported or a catalyst layer is formed on a foamed member (74b) formed in a corrugated shape using a foaming material.

According to the eighth aspect of the present invention, the same effects as those of the seventh aspect can be obtained.

According to the ninth aspect of the present invention, the catalyst comprises an oxide of any of iron, copper, zinc, titanium, cobalt, nickel, and manganese; a metal of silver, platinum, and gold; It is characterized in that either a mixture or a compound of a metal oxide is used, and a supported or catalyst layer is formed.

According to the ninth aspect of the present invention, the catalyst substance may be a mixture or a compound of the above-mentioned metals and metal oxides. In particular, by supporting gold on the catalyst,
For example, aldehydes generate a large amount of CO by electric discharge, but gold is particularly suitable for purification and oxidation of formaldehyde and acetaldehyde among aldehydes because it shows a very high activity specifically for the oxidation of CO. It is.

Further, by using a porous dielectric, gaseous pollutants can be adsorbed by physical adsorption.

The reference numerals in parentheses of the above means indicate the correspondence with the concrete means described in the embodiments described later.

[0031]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS (First Embodiment) An embodiment of the present invention will be described below with reference to FIGS. First,
In FIG. 1, a housing 1 having a purified air passage 1a therein.
In this case 1, the pre-filter 2, the dust collection filter 3, the purification filter 4, and the blower 5 are arranged in this order from the upstream side of the purification air passage 1a. The pre-filter 2 is provided to capture relatively large dust and dust contained in air taken in from an inlet (not shown), and is usually a honeycomb material or a flat plate.

Next, the dust collecting filter 3 is provided to capture relatively large particulate matter such as house ducts (dust, dust, etc.) in the air and soot and soot in cigarette smoke. An ordinary filter for filtration or an electrostatic filter is used.

Next, the purification filter 4 includes the pre-filter 2
It is provided mainly for removing gaseous pollutants contained in air, such as odors, volatile organic compounds (VOCs), and formaldehyde in the purified air that has passed through the dust collection filter 3.

As shown in FIGS. 1 and 2, the purifying filter 4 has a substantially cylindrical opposing electrode 41 and a linear discharging electrode (in this example, a coaxial line). , A central electrode structure).
The counter electrode 41 side is connected to the ground side, and the discharge electrode 4
The two sides are connected to a high voltage power supply 6. This high-voltage power supply is a high-voltage substantially rectangular wave of a positive polarity or a negative polarity or an AC high-voltage generator that alternately generates them.
Is applied to the discharge electrode 42 side.

A substantially cylindrical insulator tube 43 made of a plate-like insulator is adhered to the inner peripheral side of the counter electrode 41, and is formed by the counter electrode 41 and the inner discharge electrode 42. In this space, a dielectric pellet 44 formed of a dielectric and a porous catalyst-carrying dielectric pellet 45 carrying gold as a catalyst metal are filled.

In this filling portion, between the discharge electrode 42 and the two dielectric pellets 44 and 45,
Air passages 4a are formed between the dielectric pellets 4 and 45 and in the gap between the dielectric pellets 44 and 45 and the insulator tube 43. An outlet (not shown) is provided downstream of the blower 5, and the purified air is blown into the room to perform indoor purification.

The operation of this embodiment having the above configuration will be described. First, when an operation switch (not shown) is operated, the blower 5 rotates and the discharge electrode 42
Is applied with a predetermined high voltage. As shown in FIG. 3A, when a high voltage is applied to the discharge electrode 42, the counter electrode 4 is
1 and a potential gradient is generated. Here, the potential gradient is reduced in both the dielectric pellets 44 and 45 because +-is generated, but the potential gradient is increased in the air passage 4a.
Thus, the corona discharge is generated by concentrating the electric field in the above-described air passage 4a.

The insulator tube 4 on the inner peripheral side of the counter electrode 41
Reference numeral 3 denotes a material formed of a material having a low dielectric constant to prevent electric charges from being concentrated on the counter electrode 41 to cause a spark discharge, so that a corona discharge between the two dielectric pellets 44 and 45 can be made uniform. To do that.

Further, as a result of the corona discharge occurring in the air passage 4a, as shown in FIG. 3 (b), active oxygen is generated by the corona discharge, and the gaseous pollutant is chemically reacted with the active oxygen on the surface of the catalyst. In addition to causing adsorption, the adsorbed substance is decomposed by oxidation with active oxygen, so that the substance can be removed and regenerated with low thermal energy.

That is, in order to oxidize and decompose the target gas molecule using only a noble metal catalyst such as platinum, for example, a large heat energy for heating the catalyst is required. Energy is not required.

Further, for example, when gold is used as a catalyst, a large amount of CO is generated from aldehydes by electric discharge.
Gold exhibits a very high activity specifically for the oxidation of CO (CO → CO ₂ ), so that a reaction at a temperature below freezing is also possible. Therefore, it is suitable for purification and oxidation of formaldehyde and acetaldehyde among aldehydes.

The porous portion of the catalyst-carrying dielectric pellet 45 adsorbs gaseous pollutants by physical adsorption. Furthermore, in the present invention, the adsorption and the oxidation are performed simultaneously by corona discharge, so that the regeneration operation is not required.

In the above embodiment, the counter electrode 41
Although the description has been made by forming the shape of the insulator tube 43 into a substantially cylindrical shape, the present invention is not limited to this, and as shown in FIG.
a and the insulator tube 43a may be formed in a substantially rectangular shape.

According to the above embodiment, particulate matter such as dust and dirt in the air is captured by the pre-filter 2 and the dust collecting filter 3, and the odor in the smoke of the tobacco is provided downstream of the dust collecting filter 3. A purifying filter 4 for removing gaseous substances such as acetaldehyde gas, ammonia gas, acetic acid gas, formaldehyde gas, and volatile organic compounds (VOC), which is a component of The dielectric pellet 4 in the space between the
4 and a catalyst-carrying dielectric pellet 45 carrying gold, and an air passage 4 is provided in the space between the counter electrode 41, the two dielectric pellets 44 and 45, and the discharge electrode 42.
a, a corona discharge is generated in the air passage 4a by applying a high voltage to the discharge electrode 42, and a gaseous pollutant is generated by generating active oxygen by a catalyst of noble metal and metal oxide and discharge energy. Can be adsorbed, oxidized and decomposed.

In general, heat energy such as heating is required to oxidize the adsorbed gaseous substance, but the corona discharge can cope with low energy by active oxygen, so that the power can be reduced as compared with the conventional method. Power consumption can be reduced and power consumption is reduced.

Further, since the operation mode is such that the oxidative decomposition is performed while performing the adsorption by the corona discharge, it is not necessary to set the regeneration operation mode, and a control device having a simple structure can be used and a low-cost product can be provided.

Further, the space between the discharge electrode 42 and the counter electrode 41 is filled with the dielectric pellets 44 and 45 to form the air passage 4a, so that the air passage 4a is narrowed and gaseous pollutants and corona discharge are formed. The contact efficiency with the electrons is increased, so that the general discharge electrode 42 and the common electrode 41
It is possible to provide an air purification device having a higher purification performance than an electrostatic filter or the like having an air passage in the space.

Also, by forming the discharge electrode 42 on the coaxial line of the cylindrical counter electrode 41,
It is possible to prevent sparks from being generated due to the concentration of the electric charges on the above, and the corona discharge between the two dielectric pellets 44 and 45 can be made uniform, thereby improving the purification performance.

The insulator tube 43 is provided inside the counter electrode 41.
, It is possible to prevent the electric charge from being concentrated on the counter electrode 41 and to cause a spark discharge.
Corona discharge between 4 and 45 can be made uniform throughout, and the purification performance is further improved.

Also, by supporting gold on the catalyst,
For example, aldehydes generate a large amount of CO by electric discharge, but gold is particularly suitable for purification and oxidation of formaldehyde and acetaldehyde among aldehydes because it shows a very high activity specifically for the oxidation of CO. It is.

(Second Embodiment) In the purification filter 4 of the first embodiment described above, a discharge electrode 42 having a central electrode structure inside is disposed on the inner peripheral side of the counter electrode 41 via an insulator tube 43.
And the dielectric pellet 44
And the catalyst-carrying dielectric pellet 45, and at the filled portion, between the discharge electrode 42 and the two dielectric pellets 44, 45, between the two dielectric pellets 44, 45, and between the two dielectric pellets 44, An air passage 4a is formed in a gap between the insulator pellet 43 and the insulator tube 43, and air containing the substance to be removed is circulated in the air passage 4a. However, the present invention is not limited to this, and a plurality of both electrodes are used to further improve the removal amount, and a plurality of air passages 4a are provided to improve the purification performance. An improved purification filter may be used.

As shown in FIGS. 5, 6A and 6B, the purifying filter 7 of the present embodiment has a laminated structure of a plurality of air purifying layers (so-called minimum unit of a collective purifying filter) 70. Each air purification layer 70 has a substantially flat plate-shaped counter electrode 71 and a discharge electrode 72 facing the counter electrode 71. In a space formed by these two electrodes 71, 72, Catalyst member 73 containing gold as a catalyst metal and dielectric member 7 formed of a porous dielectric
4, the air passage 7a is formed between the catalyst member 73 and the discharge electrode 72. The discharge electrode 72 is
It is formed in a grid pattern at a predetermined pitch, and a space is provided so as to generate a corona discharge toward the catalyst member 73, and this space becomes an air passage 7a.

The air purification layer 70 is integrally laminated and accommodated in a plurality of spaces defined by partition walls 8a of the filter frame 8. The plurality of discharge electrodes 7
Reference numeral 2 denotes an AC high-voltage generator connected to the high-voltage power supply 6 and generating a positive or negative high-voltage substantially rectangular wave or alternately generates a high voltage of several kV to 20 kV to the discharge electrode 72 side. .

The operation of the purification filter 7 having the above configuration is as follows. First, when an operation switch (not shown) is operated, the blower 5 rotates, and when a predetermined high voltage is applied to the discharge electrode 72, the catalyst member is activated. 73, dielectric member 74
, A potential gradient is generated between itself and the counter electrode 71. Here, the potential gradient becomes small in the catalyst member 73 and the dielectric member 74 because +-is generated, but the potential gradient becomes large in the portion of the air passage 7a. Thus, a corona discharge is generated by concentrating the electric field in the air passage 7a.

Therefore, similarly to the first embodiment, the generation of active oxygen by the catalyst of noble metal and metal oxide and the discharge energy causes the adsorption and oxidation of gaseous pollutants,
Decomposition can be performed. Further, by stacking a plurality of air purification layers 70 and forming a plurality of air passages 7a, it is possible to provide an air purification device having a greater purification ability than in the first embodiment.

In the above embodiment, the discharge electrodes 72 are formed in a lattice shape. However, as shown in FIG. 7, the discharge electrodes 72a may be formed in vertical stripes at a predetermined pitch. Further, although not shown, they may be formed in horizontal stripes or meshes. As a result, the corona discharge can be generated throughout the air passage 7a, so that the purification ability can be improved.

As shown in FIGS. 8A and 8B,
The discharge electrode 72b may be formed in a metal wool shape (for example, a cotton shape) using a hair wire. By forming in the form of metal wool, the size of the discharge electrode 72b can be reduced by increasing the number of discharge sites.

Further, here, the catalyst member 73 is fixed to the dielectric member 74, but as shown in FIG. 9, the same effect as described above can be obtained even when the catalyst member 73a is carried on the dielectric member 74a. Things.

(Third Embodiment) In the above-described second embodiment, the purification filter 7 is composed of a plurality of air purification layers 70 in which the catalyst member 73 is opposed to the discharge electrode 72 and the air passage 7a is formed therebetween. However, the air purification layer 70 is not limited to this, and as shown in FIG. 10, the discharge electrode 7 having the catalyst member 73b carried on the outer surface of the discharge electrode 72.
2c may be used. According to this, the air passage 7a is formed between the dielectric member 74 and the discharge electrode 72c.

(Fourth Embodiment) In the above embodiment, the dielectric members 45 and 74 are formed of particles or flat plates and arranged between the two electrodes. However, the dielectric members 45 and 74 are formed into a corrugated fibrous base material. A catalyst may be supported or a catalyst layer may be formed. FIG.
As shown in (a) and FIG. 11 (b), the purification filter 7 of the present embodiment includes a counter electrode 71 formed in a grid with a predetermined pitch, and a predetermined pitch facing the counter electrode 71. And a discharge electrode 72 formed in a grid shape through the intermediary of the fiber member, and a fibrous member formed into a corrugated shape by carrying a catalyst on a fibrous base material in a space formed by the two electrodes 71, 72. 74a is provided, and an air passage 7a is formed in the direction of the arrow shown in the drawing, that is, the air passage passing through the discharge electrode 72, the fiber member 74a, and the counter electrode 71.

As the fibrous base material, a material formed of a nonconductive and nonflammable material such as ceramic fiber or glass fiber and carrying a high dielectric constant material such as barium titanate is used. good. Thus, the number of sites where electric discharge occurs due to the fact that the dielectric material and the catalyst are mixed and carried on the fibers can be increased.

The discharge electrode 72 is connected to the high-voltage power supply 6 and is a high-voltage substantially rectangular wave of positive or negative polarity or an AC high-voltage generator that alternately generates them.
A high voltage of kV is applied to the discharge electrode 72 side. Further, in the present embodiment, both electrodes 71 and 72 are formed in a lattice shape, but may be formed in a vertical stripe shape, a horizontal stripe shape, or a mesh shape.

Incidentally, iron (Fe), copper (C
u), zinc (Zn), titanium (Ti), cobalt (C
o), oxides of nickel (Ni) and manganese (Mn), metals such as silver (Ag), platinum (Pt) and gold (Au), and mixtures or compounds of these metals and metal oxides are suitable. ing. Also, a porous adsorbent such as zeolite may be mixed with these.

When the operation switch (not shown) is operated, the blower 5 is rotated and a predetermined high voltage is applied to the discharge electrode 72. A potential gradient is generated between the electrode 74 and the counter electrode 71 via the gate electrode 74a. Here, the potential gradient becomes small because +-is generated in the fiber member 74a, but as shown in FIG. 11B, the potential gradient becomes large in the portion where the fibers overlap via the air passage 7a. As a result, the electric field is concentrated on the portion of the air passage 7a near the catalyst to generate corona discharge (indicated by X in the drawing).

Therefore, as in the first and second embodiments, the generation of active oxygen by the catalyst of the noble metal and the metal oxide and the discharge energy enables the adsorption, oxidation and decomposition of the gaseous pollutant.

Further, the fiber member 74a is formed into a corrugated shape, the two electrodes 71, 72 are formed in a lattice shape, and the air passage 7a is formed in the direction from the discharge electrode 72 to the counter electrode 71 to contain the substance to be removed. By flowing the air to be removed, the ventilation resistance is greatly reduced as compared with the first embodiment, and the ability to purify the substance to be removed is excellent. Further, the air purification layer 7 according to the second embodiment
An air purification layer can be constructed at a lower cost than installing a plurality of zeros.

In this embodiment, both electrodes 71 and 72 are used.
In the space defined by the above, a catalyst is supported on a fibrous base material, and the corrugated fiber member 74a is disposed. However, the present invention is not limited to this. The member 74b may be used. In addition, when a foam having continuous bubbles is used among the foams, the purification ability can be increased in the unit passage area.

(Other Embodiments) In the above embodiment, the dust collecting filter 3 is formed by using an electrostatic filter, an electric dust collecting filter, or the like. The high-voltage power supply 6 to be applied to 42 and 72 and the counter electrodes 41 and 71 may be shared. This eliminates the need for a power supply for the dust collection filter 3 and can reduce the cost.

In the above embodiment, the discharge electrode 4
Air passages 4a between the second electrodes 72, 72 and the counter electrodes 41, 71,
Although the purification in which corona discharge is generated in 7a has been described, the present invention is not limited to this, and may be applied to a surface discharge that discharges along a surface of a dielectric or a boundary surface with a gas.

In the above embodiments, the purification and regeneration of odors in the living environment and aldehydes and other contaminant gases generated from building materials, walls, and furniture have been described. Needless to say, the present invention can be applied to purification and regeneration of various odors, harmful components in exhaust gas entering from outside air, and various odors.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing an entire configuration of an air purification device according to a first embodiment of the present invention.

FIG. 2 is a longitudinal sectional view showing the entire configuration of a circular purification filter according to the first embodiment of the present invention.

FIGS. 3A and 3B are explanatory diagrams showing a mechanism of corona discharge of a purification filter, according to the first embodiment of the present invention; FIGS.
FIG. 3 is an explanatory diagram showing a reaction of a catalyst by corona discharge.

FIG. 4 is a longitudinal sectional view showing the overall configuration of a rectangular purification filter according to the first embodiment of the present invention.

FIG. 5 is a vertical cross-sectional view illustrating an overall configuration of a purification filter according to a second embodiment of the present invention.

6A is a plan view showing details of a purification filter in a second embodiment of the present invention, and FIG. 6B is a longitudinal sectional view of FIG.

FIG. 7 is a plan view illustrating a shape of a discharge electrode according to a second embodiment of the present invention.

8A is a plan view showing a shape of a discharge electrode in a second embodiment of the present invention, and FIG. 8B is a longitudinal sectional view of FIG.

FIG. 9 is a longitudinal sectional view showing a dielectric member according to a second embodiment of the present invention.

FIG. 10 is a longitudinal sectional view showing a discharge electrode according to a third embodiment of the present invention.

FIG. 11A is a longitudinal sectional view showing an entire configuration of a fourth embodiment of the present invention, and FIG. 11B is an explanatory view showing corona discharge of a fiber member.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Case 1a ... Purification air passage 3 ... Dust collection filter (capture filter) 4, 7 ... Purification filter (air purification means) 4a, 7a ... Air passage 41, 71 ... Counter electrode 42, 72, 72a, 72b, 72c ... Discharge electrode 43 ... Insulator tube 45 ... Dielectric pellet carrying catalyst (dielectric member) 70 ... Air purification layer 73, 73a, 73b ... Catalyst member (catalyst) 74 ... Dielectric member 74a ... Fiber member (dielectric member) 74b ... Foaming Member (dielectric member)

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 4C080 AA07 BB02 CC02 CC08 HH05 JJ03 JJ06 KK08 LL10 MM02 MM07 NN01 NN11 QQ11 4G075 AA03 AA37 BA06 BD14 CA18 CA54 DA01 EB09 EC21 EE12 FA14 FB02 FB04 FB06 FC15

Claims (9)

[Claims] 1. A casing (1) forming a purified air passage (1a), and a trapping filter (3) installed upstream of the casing (1) and trapping dust and dirt contained in air. (3) an air purifying means (4) installed downstream of the trapping filter (3) for purifying and decomposing a substance to be removed by discharge;
The air purification means (4) has a discharge electrode (42) and a counter electrode (41) facing the discharge electrode (42),
In a space formed by these electrodes (41, 42), a dielectric member (4) supporting a catalyst or forming a catalyst layer is formed.
5), an air passage (4a) is formed near the catalyst, and the air containing the substance to be removed flows through the air passage (4a). Air purification device. 2. The method according to claim 1, wherein the counter electrode (41) is formed in a substantially cylindrical shape, and the discharge electrode (42) is provided to face the substantially concentric axis of the counter electrode (41). The air purification device according to claim 1, wherein: 3. A dielectric member (45) carrying the catalyst or forming a catalyst layer on an inner peripheral side of the counter electrode (41) via an insulator tube (43) formed in a substantially cylindrical shape. The air purification device according to claim 2, wherein the air purification device is configured to be insulated. 4. A casing (1) forming a purified air passage (1a), and a trapping filter (3) disposed upstream of the casing (1) and trapping dust and dirt contained in air. (3) an air purifying means (7) installed downstream of the trapping filter (3) for purifying and decomposing a substance to be removed by discharge;
The air purification means (7) includes a plurality of air purification layers (7).
0), each of the air purification layers (70) has a ground electrode (71) and a discharge electrode (72) facing the ground electrode (71).
A dielectric member (74) carrying a catalyst or forming a catalyst layer is disposed in the space defined by (72), and an air passage (7a) is provided in the vicinity of the catalyst. An air purification device characterized by flowing air containing a substance to be removed. 5. A casing (1) forming a purified air passage (1a), and a trapping filter (3) installed upstream of the casing (1) and trapping dust and dirt contained in air. (3) an air purifying means (7) installed downstream of the trapping filter (3) for purifying and decomposing a substance to be removed by discharge;
The air purification means (7) includes a plurality of air purification layers (7
0), wherein each of the air purification layers (70) has a discharge electrode (72) and a counter electrode (71) facing the discharge electrode (72), and the discharge electrode (72)
A catalyst is supported or a catalyst layer is formed on the outer surface of the electrode, a dielectric member (74) is disposed in a space formed by these electrodes (71, 72), and an air passage (7a) is provided near the catalyst. And an air purification device configured to flow air containing the substance to be removed into the air passage (7a). 6. The discharge electrode (72) is formed in any one of a vertical stripe shape, a horizontal stripe shape, a lattice shape, a mesh shape, or a metal wool shape, and a plurality of the discharge electrodes are directed toward the catalyst. The air purification device according to claim 4, wherein the discharge is performed by a discharge electrode. 7. The dielectric member (45, 74), wherein the catalyst is carried or a catalyst layer is formed on a corrugated fiber member (74a) using a fiber material. The air purifying device according to any one of claims 1 or 4 or 5. 8. The dielectric member (45, 74), wherein the catalyst is carried or a catalyst layer is formed on a foamed member (74b) formed in a waveform using a foaming material. The air purification device according to any one of claims 1 or 4 or 5. 9. The catalyst according to claim 1, wherein the oxide is any one of iron, copper, zinc, titanium, cobalt, nickel and manganese;
The carrier or the catalyst layer is formed by using any one of silver, platinum, and gold, and a mixture or a compound of these metals or metal oxides, and forming a supported or catalyst layer. Item 10. An air purification device according to item 8.