JPH11267457A - Air cleaner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To contrive improving the safety, promoting the decomposition perfor mance for polluted gas, and shortening the desorption and decomposition treat ment time in an air cleaner having a function of adsorbing the polluted gas on living before desorbing and decomposing it by heating treatment. SOLUTION: On desorption and decomposition treatment mode action, an air blowing means 17 is arranged above a wind path 11 in which an adsorption means 12, a heating means 13, and a decomposition means 14 are installed, and the heated air is caused to flow in the direction from the upper part to the lower part of the wind path 11. In this way, since the heated air exchanges heat with the blades of the air blowing means 17 and the body thereof to cool it and to improve the usability, and also the adsorption means 12 and decomposition means 14 can be uniformly and effectively heated, the decomposition performance of polluted gas is improved to enable shortening the decomposition treatment time.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to exhaust gas from combustion equipment,
A regeneration function that adsorbs pollutants at the time of life, such as volatile organic compounds such as formaldehyde, xylene, and toluene generated from tobacco odors, building materials, walls, and furniture, and then decomposes and purifies them by heat treatment The present invention relates to an air cleaning device having the same.

[0002]

2. Description of the Related Art Conventionally, as an air purifying apparatus having such a function, there is an air purifying apparatus described in Japanese Patent Application Laid-Open No. 3-68419. As shown in FIG. 3, this device has a configuration in which an electrostatic filter 2, a deodorizing device 3, and a blower fan 4 are provided inside an air purifying device main body 1.
Is configured such that an adsorbent 6 is sandwiched by an oxidation catalyst 5 and a heater 7 for a heating wire is disposed outside the adsorbent 6. With this configuration, the blower fan 4
Is operated, the air containing the pollutant gas in the room is guided from the airflow inlet into the air purifier main body 1, and the contaminant gas is adsorbed by the adsorbent 6. When the adsorbent 6 is saturated by the adsorption of the contaminant gas, the blower fan 4 is stopped, and the heater 7 is energized to heat the adsorbent 6 and the oxidation catalyst 5, so that the contaminant gas adsorbed on the adsorbent 6 is removed. Desorption. The desorbed contaminant gas is oxidatively decomposed and removed by the oxidation catalyst 5 activated by heating, and the adsorbent 6 is regenerated.

[0003]

However, the above-mentioned conventional air purifying device has a structure in which the electrostatic filter 2 having a low air pressure loss is disposed between the air inlet and the deodorizing device 3.
During the regeneration process, there is a problem that the high-temperature air heated by the heater 7 is exhausted into the room and the room temperature rises.

In addition, during the adsorption process, a part of the contaminated gas is adsorbed to the member near the air flow inlet located upstream of the deodorizer 3 and the electrostatic filter 2, so that the contaminated gas adsorbed during the regeneration process is desorbed by heating. In addition, there is a problem that it is released into a room without being decomposed.

Further, the lower part of the oxidation catalyst 5 and the adsorbent 6 has poor heat transfer because the air heated by the heater 7 moves to the upper part, and contaminate gas adsorbed on the lower part. There is a problem that it takes a long time to desorb and requires a long time to complete the regeneration, and also it takes time to reach the activation temperature of the oxidation catalyst 5, so that the desorbed pollutant gas is released without being oxidized and decomposed.

Further, volatile organic compounds generated from exhaust gas of combustion equipment, building materials, walls, furniture, etc., contain components having a boiling point of 200 ° C. or more. To desorb high boiling components in a short time, the adsorbent 6 must be used. Although it is necessary to heat to a high temperature, since the heating area is large in the oxidation catalyst 5 and the adsorbent 6 having the configuration shown in FIG.
In order to heat this uniformly in a short time, there is also a problem that the power consumption of the heater 7 becomes large.

[0007]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides an adsorption mode for adsorbing and removing contaminated gas in air and a desorption decomposition mode for decomposing and purifying contaminated gas desorbed by heating the adsorbed gas. Having a function, a purifying air passage composed of an adsorption unit, a heating unit disposed below the adsorption unit, and a decomposition unit disposed above the adsorption unit,
In an air purifying apparatus provided with a blowing means for blowing air, the blowing means is disposed above the purification air passage, and the air flows upward in the purification air passage during the desorption mode. Things.

According to the above invention, the high-temperature air heated by the heating means in the desorption / decomposition mode operation flows from the purification air passage toward the upper part where the blowing means is provided, passes through the blowing means and enters the room. Although it is discharged, the high-temperature air contacts the blades constituting the air blowing means and the main body side and exchanges heat, so that it is possible to cool the room into low-temperature air and improve safety. Can be. In addition, since the air heated by the heating means flows upward due to natural convection, the suction means can be uniformly and efficiently heated, the power consumption of the heating means can be reduced, and the air is absorbed by the suction means. The desorption process of the contaminated gas can be performed in a short time. In addition, since the decomposition means can use the natural convection of the air heated by the heating means, the temperature can be raised to the decomposition temperature of the contaminated gas in a short time, and the decomposition performance of the contaminated gas desorbed from the adsorption means can be improved. it can.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A body having a purification air passage therein;
The purifying air passage has an adsorbing means for adsorbing the contaminated gas in the air therein, a heating means for desorbing the contaminated gas adsorbed on the adsorbing means disposed below the adsorbing means, and an upper part of the adsorbing means. A decomposing means for decomposing the contaminated gas desorbed from the adsorbing means disposed therein; a blowing means for blowing air; an adsorption mode for adsorbing the contaminated gas in the air; and a desorption for desorbing and decomposing the adsorbed contaminated gas. Switching means for switching the decomposition mode, and control means for controlling the switching means, wherein the blowing means is provided above the purification air passage, and the air is directed upward in the purification air passage during the operation of the desorption decomposition mode. It is a configuration that flows to.

[0010] During the operation of the desorption / decomposition mode, the high-temperature air heated by the heating means flows from the purification air passage toward the upper portion where the blowing means is provided, passes through the blowing means, and is discharged into the room. When the heated high-temperature air passes through the blowing means, it comes into contact with a plurality of blades constituting the blowing means and exchanges heat, and also exchanges heat from around the main body. Therefore, since relatively cool air can be discharged into the room, the safety of the equipment such as burn prevention can be improved. Further, since the air heated by the heating means flows upward using natural convection, the adsorption means can uniformly and efficiently heat the air heated by the heating means and the radiation. In addition, the power consumption of the heating means can be reduced, the desorption process of the contaminated gas adsorbed on the adsorption means can be performed in a short time, and the operation time of the desorption decomposition mode can be shortened.

In the suction mode operation, air flows upward in the purification air passage.

With the above configuration, during the operation in the adsorption mode, the contaminated gas contained in the air can be passed through the purification air passage first, so that the contaminated gas is supplied to the blowing means disposed above the purification air passage. Adsorption is prevented, and even when the blowing means is heated by the heating means or the decomposition means during the desorption / decomposition mode operation, no polluting gas is released from the blowing means, and the contaminated gas desorbed from the adsorption means always passes through the decomposition means It can be decomposed and purified, thereby preventing indoor pollution.

[0013] Further, the operation is performed by changing the air blowing amount of the air blowing means in the desorption / decomposition mode operation and the adsorption mode operation.

[0014] By changing the air volume,
Since the apparatus can be operated with a flow rate suitable for each of the adsorption mode and the desorption decomposition mode, excellent adsorption performance and decomposition performance can be realized.

[0015] Further, in the desorption / decomposition mode operation, the blowing amount of the blowing means is made smaller than that in the adsorption mode operation to operate the blowing means.

By reducing the amount of air blown during the desorption / decomposition mode operation, the cooling of the adsorption means and the decomposition means by the air blowing means is suppressed, so that the desorption of contaminated gas can be performed efficiently and the decomposition means Can utilize the natural convection of the air heated by the heating means, so that the temperature can be raised to the decomposition temperature of the polluted gas in a short time, and the decomposition performance of the polluted gas can be improved.

During the operation of the desorption / decomposition mode, the blower is stopped. By stopping the blowing means, the air heated by the heating means and the decomposing means can flow only by natural convection, and the pressure loss of the flow path is increased by the blowing means provided at the upper part of the purification air passage. Therefore, the flow rate passing through the decomposition means is reduced, and the decomposition efficiency of the desorbed pollutant gas can be improved.

The decomposing means comprises a catalyst carrying a catalyst for decomposing pollutant gas and a catalyst heating means for heating the catalyst.

The pollutant gas can be decomposed at a low temperature by using the catalyst as the decomposition means, and the temperature of the catalyst can be raised to the activation temperature of the catalyst in a short time by heating the catalyst with the catalyst heating means. Therefore, the decomposition performance of the contaminated gas desorbed from the adsorption means can be improved, and the emission of the contaminated gas to the outside of the room can be prevented.

Further, the decomposing means is constituted by an electric heating element carrying a catalyst for decomposing pollutant gas.

Further, by directly supplying electricity to the catalyst for decomposing the polluted gas to generate heat, the temperature can be raised to the activation temperature of the catalyst more quickly than in the above-described catalyst heating means. Can be enhanced.

[0022]

Embodiments of the present invention will be described below with reference to the drawings.

(Embodiment 1) FIG. 1 is a cross-sectional view of an air cleaning apparatus according to Embodiment 1 of the present invention. In the figure, reference numeral 11 denotes a purification air passage provided inside the air purification device main body, and inside the purification air passage 11, odors in the air, volatile organic compounds such as aldehydes generated from building materials, walls, and furniture are provided. Adsorption means 12 for adsorbing the contaminated gas, heating means 13 for heating the adsorption means 12 disposed below the adsorption means 12 to desorb the adsorbed contaminant gas, and disposed above the adsorption means 12 Decomposition means 14 for decomposing the desorbed contaminated gas is provided. The decomposition means 14 comprises a catalyst 15 and a catalyst 15
Catalyst heating means 1 for heating the catalyst to the activation temperature below
6 are arranged. Further, a blowing means 17 composed of a cross flow fan is attached to the upper part of the purification air passage 11. In the figure, solid arrows indicate the flow of air during adsorption mode operation for adsorbing and removing pollutant gas contained in indoor air, and dotted arrows indicate air during desorption decomposition mode operation for desorbing and decomposing adsorbed pollutant gas. It shows the flow. Switching between the adsorption mode and the desorption decomposition mode
The heating unit 13, the decomposition unit 14, and the blowing unit 17 are electrically connected to each other by a switching unit 18 and a control unit 19 that controls the switching unit 18.

The adsorbing means 12 is formed by coating an adsorbent on a honeycomb-shaped structure having ventilation holes mainly composed of alumina / silica, and contaminant gas is adsorbed on the pores of the adsorbent particles. Further, the catalyst 1 as the decomposition means 14
Reference numeral 5 denotes an expanded metal plate having ventilation holes, which carries an oxidation catalyst for enhancing the oxidative decomposition ability of pollutant gas. The catalyst heating means 16 is constituted by a heating wire heater. Next, the operation and operation will be described.

(1) Suction mode When a power supply (not shown) is turned on, the switching means 18 operates the suction mode in accordance with a command from the control means 19. That is, the fan as the blowing means 17 is operated, and the air containing the pollutant gas in the room flows into the purification air passage 11 from the suction port 20 as shown by the solid line arrow in the figure, and the heating means 13, the adsorption means 12, and the decomposition means 14 (catalyst heating means 16 and catalyst body 15) in this order. The contaminated gas contained in the air is selectively adsorbed by the adsorbent of the adsorbing means 12 and the purified air is supplied to the blowing means 17.
And is returned from the outlet 21 into the room. While this adsorption mode is operating, the heating means 13 and the catalyst heating means 16 do not operate, and only the removal by adsorption of the pollutant gas contained in the air is performed.

(2) Desorption / decomposition mode When the apparatus is operated for a predetermined time in the adsorption mode, the switching means 18 operates to activate the desorption / decomposition mode in accordance with a command from the control means 19. First, the fan, which is the blowing means 17, is operated at a reduced rotation speed to reduce the amount of air blown, and the heating means 13 and the catalyst heating means 16 disposed above the adsorption means 12 generate heat. The adsorption unit 12 is heated by the air heated by the heating unit 13 and the radiation from the heating unit 13, and desorbs the contaminant gas adsorbed on the adsorption unit 12. The desorbed contaminated gas is guided to the decomposition means 14 as shown by the dotted arrow in the figure, and is oxidized and decomposed into harmless carbon dioxide gas and water vapor by the catalyst of the catalyst body 15 already activated by the catalyst heating means 16. Then, the purified air is discharged from the outlet 21 into the room. When most of the contaminated gas adsorbed on the adsorbing means 12 is desorbed and decomposed, the heating of the catalyst heating means 16 of the heating means 13 and the decomposing means 14 is stopped by a command of the control means 19, and the desorption decomposition mode ends. By repeating the adsorption mode and the desorption / decomposition mode, it is possible to purify the pollutant gas without maintenance.

At the time of the desorption / decomposition mode operation, the high-temperature air heated by the heating means 13 and the catalyst heating means 16 is supplied to the purification air passage 1 by the weak air blowing of the air blowing means 17 and natural convection.
The air flows toward the upper part of 1 and passes through the blowing means 17 to be discharged indoors. When the heated high-temperature air passes through the blowing means 17, the heated high-temperature air comes into contact with a plurality of blades and a main body of the cross flow fan constituting the blowing means 17 and exchanges heat. Therefore, since the cooled low-temperature air can be discharged into the room, it is possible to improve the safety of equipment such as prevention of burns. In this case, the material of the fan serving as the blowing means 17 is preferably a metal material having excellent heat conductivity and heat resistance, and particularly, aluminum and stainless materials are suitable.

Further, volatile organic compounds generated from exhaust gas of combustion equipment, building materials, walls, and furniture contain components having a boiling point of 200 ° C. or more. To desorb high boiling components in a short time, the adsorption means 12 must be operated quickly. Although it is necessary to raise the temperature to a high temperature, since the configuration is such that the air flow flows toward the upper part of the purification air passage 11 by the blowing means 17 and natural convection, the adsorption means 1
2 can be uniformly and efficiently heated by the air heated by the heating means 13 and the radiation.
Power consumption can be reduced. In addition, adsorption means 1
The desorption treatment of the contaminated gas adsorbed on the substrate 2 can be performed in a short time, and the operation time of the desorption decomposition mode can be shortened.

Further, since the heating means 13 and the catalyst heating means 16 are operated only in the desorption / decomposition mode, power consumption can be reduced, and since the room temperature is not raised, it can be used as an air purifier over the whole season. it can.

Further, the air flows upward in the purification air passage 11 during the adsorption mode operation, so that the pollutant gas contained in the air can be removed during the adsorption mode operation.
Can pass first. Therefore, adsorption of the contaminant gas to the blowing means 17 disposed above the purification air passage 11 is prevented, and even if the blowing means 17 is heated by the heating means 13 or the decomposition means 14 during the desorption / decomposition mode operation, the blowing means 17 is not affected. The pollutant gas which is not released from the adsorption means 12 and which is desorbed from the adsorption means 12 must be decomposed by the decomposition means 1
4 and can be decomposed and purified, so that indoor pollution can be prevented.

Further, by changing the amount of air blown by the blowing means 17 during the desorption / decomposition mode operation to a smaller flow rate than during the adsorption mode operation, the suction means 12 and the decomposing means 14 are separated.
Since the cooling of the catalyst body 15 is suppressed, the desorption of the pollutant gas can be performed more efficiently, and the catalyst body 15
Since the temperature of the catalyst can be raised to the activation temperature in a short time and maintained, high contaminant gas decomposition performance can be realized.

The catalyst 1 used as the decomposition means 14
5 is a structure in which a catalyst for oxidizing and decomposing contaminant gas is supported on an expanded metal plate, so that a small heat capacity and excellent thermal conductivity can be realized. Can be. Therefore, the temperature of the catalyst supported on the expanded metal plate can be raised to the activation temperature in a short time.
The contaminated gas desorbed from Step 2 can be decomposed and purified without passing undecomposed, and excellent catalytic performance can be realized.

In the present embodiment, a honeycomb-shaped structure having ventilation holes mainly composed of alumina / silica coated with an adsorbent is used as the adsorbing means 12, but the present invention is not limited to this structure. Also, a porous body formed with an adsorbent can be used. Any adsorbent can be used as long as it can adsorb pollutant gas. However, when desorbing a volatile organic compound having a high boiling point, the adsorbing means 12 can be used.
Is required to be heated to 200 ° C. or higher, so that zeolite or silica gel having high heat resistance is preferable.

The heating means 13 is used for the purpose of desorbing the contaminant gas adsorbed on the adsorption means 12, and is constituted by an electric heating element using a heating wire, a metal or ceramic planar electric heating element, the adsorption means 12 itself or A method of arranging a magnetic material in the vicinity thereof and performing induction heating is also applicable.

Further, the catalyst body 15 is for purifying the desorbed contaminated gas by oxidative decomposition, and is not limited to the expanded metal plate supporting the catalyst described in the embodiment. A catalyst in which a catalyst is supported on a honeycomb-shaped ceramic is also applicable. The catalyst used for the catalyst body 15 is used to enhance the ability of the pollutant gas to oxidize and decompose, and the catalyst materials include Cu, Mn, Co, and F.
e, Ni, Si, Al oxide or Pt, Pd, Rh, A
At least one of the metals u and Ag is used, but Pt, Pd, Rh, Au and Ag fine particles, which are particularly excellent in heat resistance and catalytic activity, are preferred.

If the decomposition means 14 can realize a high temperature of 600 ° C. or more, it becomes possible to decompose the pollutant gas by heat. Therefore, it is not necessary to use a catalyst, and the heating means 13 can be used as the decomposition means.

Although a heating wire heater is used as the catalyst heating means 16, the invention is not limited to this, and a metal or ceramic sheet heating element can be used.

(Embodiment 2) FIG. 2 is a cross-sectional view of an air cleaning apparatus according to Embodiment 2 of the present invention. The difference between the first embodiment and the first embodiment lies in that the catalyst 15 as the decomposition unit 14 and the catalyst heating unit 1
6 Instead of using an expanded metal plate having ventilation holes as an electric heating element, a decomposition means 22 constituted by carrying an oxidation catalyst for improving the oxidative decomposition ability of pollutant gas is used. The components having the same reference numerals as those in the first embodiment have the same structure, and a description thereof will be omitted.

Next, the operation and operation will be described. (1) Adsorption mode The fan which is the blowing means 17 is operated, and the air containing the contaminated gas in the room flows into the purification air passage 11 from the suction port 20 through the blowing means 17 as shown by the solid arrow in the figure, and is heated. Means 1
3, pass through the adsorption means 12 and the decomposition means 22 in this order. The contaminated gas contained in the air is selectively adsorbed by the adsorbent of the adsorbing means 12, and the purified air is returned to the room from the outlet 21. While this adsorption mode is operating, the heating means 1
3. The decomposing means 22 does not operate, and only the contaminated gas contained in the air is removed by adsorption, thereby purifying the room.

(2) Desorption / decomposition mode After operating for a predetermined time in the adsorption mode, the switching means 18 operates to activate the desorption / decomposition mode in accordance with a command from the control means 19. First, the cross flow fan which is the blowing means 17 is stopped, and the heating means 1 disposed above the adsorption means 12 is heated.
3 and the decomposition means 22 are heated. The adsorption unit 12 is heated by the air heated by the heating unit 13 and the radiation from the heating unit 13, and the contaminant gas adsorbed on the adsorption unit 12 is desorbed. The desorbed contaminated gas is guided to a decomposing means 22 as shown by a dotted arrow in the figure, and is oxidatively decomposed into harmless carbon dioxide gas and water vapor by a catalyst which has already been activated, and purified air is supplied to an outlet 21. It is discharged more indoors. When most of the contaminated gas adsorbed on the adsorption unit 12 is desorbed and decomposed, the heating of the heating unit 13 and the decomposition unit 22 is stopped, and the desorption decomposition mode is ended. By repeating the adsorption mode and the desorption / decomposition mode, it is possible to purify the pollutant gas without maintenance.

In the operation of the desorption / decomposition mode, the blowing means 1
7, the heating means 13 and the decomposition means 22 are stopped.
The heated air can flow only by natural convection, and the pressure loss of the air flow path can be increased because the blowing means 17 is provided above the purification air path 11. Therefore, the flow rate of the air containing the contaminated gas desorbed from the adsorbing means 12 passing through the decomposing means 22 is reduced, and the decomposition efficiency of the contaminated gas can be improved.

Further, since the decomposing means 22 is configured to generate heat by direct energization, the rate of temperature rise is faster than that of the indirect heating of the first embodiment, and the catalyst of the decomposing means 22 is heated to the activation temperature in a short time. Since the temperature can be raised, the contaminated gas desorbed from the adsorption means 12 can be decomposed and purified without passing undecomposed, and excellent catalytic performance can be realized.

The decomposing means 22 is for decomposing and purifying the desorbed contaminated gas by oxidizing and decomposing. In addition to the electric heating element of the expanded metal plate described in the embodiment, a heating means using a wire net as a heating element and a heating means 13 are also used. Applicable.

[0044]

As described above, according to the air purifying apparatus of the first aspect of the present invention, when operating in the desorption / decomposition mode of the contaminated gas, the purified air provided with the heating means, the adsorption means, and the decomposition means is provided. Arranged in the upper part of the passage, the heated air flows upward in the purification air passage so that the high-temperature air heated by the heating means in the desorption / decomposition mode operation blows air from the purification air passage through the purification air passage. Since it flows in the direction of the upper part where it is arranged and contacts the multiple blades and main body that constitute the blowing means and exchanges heat, it can discharge relatively low-temperature air into the room and prevent equipment such as burns. Safety can be improved. In addition, the adsorption means can uniformly and efficiently heat the air heated by the heating means and the radiation, thereby reducing the power consumption of the heating means and desorbing the contaminated gas adsorbed by the adsorption means. Can be performed in a short time, and the operation time of the desorption decomposition mode can be shortened. In addition, since the decomposition means can use the natural convection of the air heated by the heating means, the temperature can be raised to the decomposition temperature of the contaminated gas in a short time, and the decomposition performance of the contaminated gas desorbed from the adsorption means can be improved. it can.

According to the air purifying apparatus of the second aspect,
During operation in the adsorption mode, the air flows upward in the purification air passage, so that the pollutant gas contained in the air can pass through the purification air passage first, so that it is disposed above the purification air passage. Contaminated gas is prevented from being adsorbed to the blower provided, and during the desorption / decomposition mode operation, even if the blower is heated by the heater or the decomposer, the contaminant gas is not released from the blower and desorbed from the adsorber Since the polluted gas can always pass through the decomposition means and be decomposed and purified, indoor pollution can be prevented.

According to the third aspect of the present invention, the air purifier is operated by changing the air flow rate of the air blowing means in the desorption / decomposition mode operation and the adsorption mode operation, so that it is suitable for each of the adsorption mode and the desorption / decomposition mode. Since the apparatus can be operated with the supplied air flow, excellent adsorption performance and decomposition performance can be realized.

According to the air purifying apparatus of the fourth aspect, during the desorption / decomposition mode operation, the amount of air blown by the blowing means is made smaller than that in the suction mode operation to operate the blowing means. Since the cooling of the decomposition means is suppressed, the desorption of the contaminated gas can be performed efficiently, and the decomposition means can use the natural convection of the air heated by the heating means, so that the temperature can be raised to the decomposition temperature of the contaminated gas in a short time. And the decomposition performance of the pollutant gas can be improved.

According to the air purifying apparatus of the fifth aspect, the air heated by the heating means and the decomposition means can flow only by natural convection by stopping the air blowing means during the desorption / decomposition mode operation. Since the pressure loss of the flow path can be increased by the blowing means disposed above the purification air passage, the flow velocity passing through the decomposition means can be reduced, and the decomposition efficiency of the desorbed pollutant gas can be improved.

According to the air purifying apparatus of the sixth aspect, the use of the catalyst as the decomposition means makes it possible to decompose the contaminated gas at a low temperature, and the catalyst has a small heat capacity and excellent heat conduction. Since the temperature can be raised to the activation temperature in a short time, the decomposition performance of the contaminated gas desorbed from the adsorption means can be improved, and the emission of the contaminated gas to the outside can be prevented.

According to the seventh aspect of the present invention, since the decomposition means is constituted by an electric heating element carrying the catalyst, the catalyst can be directly heated, so that the temperature can be raised more quickly to the activation temperature of the catalyst. In addition, the decomposition of pollutant gas can be further enhanced.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of an air cleaning device according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional view of an air purifying apparatus according to a second embodiment of the present invention.

FIG. 3 is a cross-sectional view of a conventional air cleaning device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Purification air path 12 Adsorption means 13 Heating means 14 Decomposition means 15 Catalyst 16 Catalyst heating means 17 Blowing means 18 Switching means 19 Control means 22 Decomposition means

Claims (7)

[Claims] A main body having a purifying air passage therein; an adsorbing means for adsorbing pollutant gas in the air in the purifying air passage; and an adsorbing means provided below the adsorbing means. Heating means for desorbing the contaminated gas, decomposing means for decomposing the contaminated gas desorbed from the adsorbing means provided above the adsorbing means, and blowing means for blowing air; and Switching means for switching between an adsorption mode for adsorbing gas and a desorption decomposition mode for desorbing and decomposing the contaminated gas adsorbed, and control means for controlling the switching means, wherein the blowing means is provided above the purification air passage. And an air purifier configured to allow air to flow upward in the purification air passage during the desorption / decomposition mode operation. 2. The air purifying apparatus according to claim 1, wherein air flows upward in the purification air passage during the adsorption mode operation. 3. The air purifying apparatus according to claim 1, wherein the air purifier is operated by changing the air flow rate of the air blowing means in the desorption / decomposition mode operation and the adsorption mode operation. 4. The air purifying apparatus according to claim 1, wherein, during the desorption / decomposition mode operation, the amount of air blown by the air blowing means is made smaller than that during the adsorption mode operation to operate the air blowing means. 5. The air purifying apparatus according to claim 1, wherein the blower is stopped during the operation of the desorption / decomposition mode. 6. The air purifying apparatus according to claim 1, wherein the decomposing means comprises a catalyst carrying a catalyst for decomposing pollutant gas, and catalyst heating means for heating the catalyst. 7. An air purifying apparatus according to claim 1, wherein said decomposition means comprises an electric heating element carrying a catalyst for decomposing pollutant gas.