JPH05317639A - Air cleaner - Google Patents

Abstract

(57) [Summary] [Construction] In this air purifying apparatus, the ozone deodorizing section 3 and the alcohols removing section 4 are selectively driven by the switching means 61. When the gas concentration of ethanol or the like detected by the gas sensor 5 exceeds a predetermined value, the switching unit 61 stops driving the ozone deodorizing unit 3 and drives the alcohols removing unit 4. [Effect] It is possible to prevent the generation of a bad odor due to the oxidation of alcohols. By removing alcohols, it is possible to quickly return to the normal state in which ozone deodorization is performed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air cleaner for removing malodorous components in air by ozone.

[0002]

2. Description of the Related Art Conventionally, in order to remove malodorous line components in the air, such as ammonia, hydrogen sulfide, trimethylamine, methyl disulfide, acetaldehyde, styrene, etc.
An ozone deodorizer utilizing ozone is known. In this ozone deodorizer, ozone generated from an ozone generator is decomposed by an ozone decomposition catalyst to generate oxygen in the nascent stage (so-called radical oxygen), and this is reacted with a malodorous gas to deodorize air. I am trying.

[0003]

However, when such an ozone deodorizer is installed in a room such as a women's changing room where the odor of perfume is likely to be filled, there are the following problems. That is, although the perfume contains ethanol, the ethanol once adsorbed on the ozone decomposition catalyst is
Oxidation by the above-mentioned radical oxygen generated by the decomposition of ozone turns into acetaldehyde and acetic acid (other fatty acids such as propionic acid, butyric acid, and valeric acid) to generate a foul odor.

Further, even when the ozone deodorizer is installed in a room with a large amount of smoking, alcohols and aldehydes contained in the combustion gas of cigarettes are oxidized in the same manner as described above, thereby giving off a bad odor. Had occurred. The purpose of the present invention is to
It is an object of the present invention to provide an air cleaning device that solves the above technical problem and can prevent the generation of a bad odor due to the oxidation of alcohols.

[0005]

According to a first aspect of the present invention, there is provided an air cleaning device, wherein first and second air passages are formed independently of each other and the first air passage is provided. An ozone generator for generating ozone for deodorizing indoor air sent inside, an ozone deodorizing section having an ozone decomposing catalyst for decomposing the ozone, and detecting the gas concentration of at least one of ethanol and carbon monoxide A gas sensor, an alcohols removing section including a filter for removing alcohols arranged in the second air passage, and an alcohols removing section is driven in a state where the detection value by the gas sensor exceeds a predetermined value, and the detection value is detected. Is equipped with a switching means for selectively switching between driving the ozone deodorizing unit and the alcohols removing unit so that the ozone deodorizing unit is driven in a state of less than a predetermined value. It is intended to.

Further, in claim 1, the ventilating means for discharging the air in the room to the outside, and the ventilating means is driven when the detected value by the gas sensor exceeds a predetermined value, and the ventilating means is activated when the detected value becomes less than the predetermined value. A ventilation control means for stopping driving is preferable. An air purifying apparatus according to claim 3 is an air purifying apparatus having an ozone generator for generating ozone for deodorizing indoor air sent through an air duct, and an ozone decomposing catalyst for decomposing the ozone, wherein: A gas sensor for detecting the gas concentration of at least one of carbon monoxide,
Ozone generation control means for stopping the drive of the ozone generator when the alcohol detection filter arranged on the upstream side in the air blowing direction of the ozone generator in the air passage and the detection value by the gas sensor exceed a predetermined value. It is characterized by having and.

An air purifying apparatus according to claim 4 is an ozone generator for generating ozone for deodorizing indoor air,
And in the air purifying apparatus having an ozone decomposing catalyst for decomposing ozone, a gas sensor for detecting a gas concentration of at least one of ethanol and carbon monoxide, a ventilation means for discharging indoor air to the outside, and a detection value by the gas sensor. Exceeds a predetermined value, the ozone generation control means stops driving the ozone generator, and the ventilation means is driven when the detected value by the gas sensor exceeds a predetermined value, and the ventilation means is driven when the detected concentration is less than the predetermined value. And a ventilation control means for stopping.

[0008]

According to the structure of the air cleaning device of claim 1,
In the normal state where the gas concentration of ethanol contained in perfume or carbon monoxide contained in the combustion gas of cigarette is less than a predetermined value, only the ozone deodorizing section is driven. When the gas concentration exceeds a predetermined value, the switching unit stops driving the ozone deodorizing unit and drives the alcohol removing unit. This prevents the generation of offensive odor due to the oxidation of alcohols adsorbed on the ozone decomposition catalyst,
By removing the alcohols, the gas concentration in the room is quickly returned to a state below a predetermined value, and again the normal state in which only the ozone deodorizing unit is driven is quickly returned.

According to the air cleaning apparatus of the second aspect, when the gas concentration of ethanol or the like exceeds a predetermined value, the indoor air is exhausted to the outside by the ventilation means, so that the indoor gas concentration can be efficiently lowered. Therefore, the normal state in which only the ozone deodorizing unit is driven can be returned to the normal state. According to the air cleaning apparatus of the third aspect, the ozone generator is driven to perform ozone deodorization in a normal state where the gas concentration of ethanol or the like is less than the predetermined value. When the gas concentration exceeds a predetermined value, the ozone generation control means stops the driving of the ozone generator, so that the generation of a bad odor due to the oxidation of alcohols can be avoided. Then, when alcohols are removed by the alcohols removal filter and the gas concentration becomes less than a predetermined value, ozone deodorization is performed again. Since the alcohols removal filter is arranged on the upstream side of the ozone generator in the air blowing direction, the amount of alcohols supplied to the ozone decomposition catalyst side can be significantly reduced.

According to the fourth aspect of the present invention, in the normal state where the gas concentration is less than the predetermined value, the ozone generator is driven to perform ozone deodorization. When the gas concentration exceeds a specified value, the ozone generation control means stops the driving of the ozone generator to prevent the generation of offensive odors, and the ventilation control means drives the ventilation means to discharge indoor air containing alcohol to the outside. It is possible to return to the normal state of performing ozone deodorization at an early stage.

[0011]

Embodiments will be described in detail below with reference to the accompanying drawings showing embodiments. FIG. 1 is a schematic configuration diagram showing an air cleaning device according to an embodiment of the present invention. This air cleaning device is provided in first and second air passages 1 and 2 which are provided independently of each other, an ozone deodorizing section 3 arranged in the first air passage 1 and a second air passage 2. The alcohol removal unit 4 is provided, a gas sensor 5 installed at a predetermined position in the room, and a control unit 6 that controls the operation of the device.

The first air passage 1 is for exhausting indoor air sucked from the inlet 1a from the outlet 1b. First
In the air flow path 1 of the above, a pre-filter 31 for removing particulate matter, an ozone generator 32 for generating ozone, an ozone decomposition catalyst 33, a fan 34, and a lower fatty acid adsorption filter 35 are sequentially installed from the upstream side in the air flow direction. The ozone deodorizing unit 3 is configured by these components.

The prefilter 31 is made of non-woven fabric, nylon or the like. The ozone generator 32 has an ozone generating electrode 32a.
And a high voltage generator 32b for generating ozone by applying a high voltage to the ozone generating electrode 32a for silent discharge.
It has and. As the ozone decomposing catalyst 33, any of various conventionally known decomposing catalysts having a honeycomb structure can be used, for example, i) activated carbon, ii) one in which oxides of cobalt and manganese are supported on a ceramic honeycomb, iii)
Examples thereof include those in which oxides of copper and manganese are supported on a ceramic honeycomb, and iv) those in which nickel oxide is supported on a ceramic honeycomb. Ozone is decomposed by the ozone decomposition catalyst 33,
When so-called radical oxygen is generated, this causes ammonia, carbon monoxide, hydrogen sulfide, methyl mercaptan, dimethylamine, which cannot be removed by ordinary activated carbon.
Oxidizes malodorous gases such as trimethylamine, pyridine and phenol to deodorize them. In addition, the ozone decomposition catalyst 33
Prevents ozone from being discharged outside the device by decomposing ozone, which may adversely affect the human body.

The fan 34 comprises a sirocco fan,
Driven by the motor 36, the inlet portion 1a to the outlet portion 1
Generate an aeration flow to b. Lower fatty acid adsorption filter 3
No. 5 has a honeycomb structure, and examples thereof include activated carbon, and activated carbon chemically treated so that the surface has acidity. The lower fatty acid adsorption filter 35 adsorbs lower fatty acids such as acetic acid, propionic acid, butyric acid and valeric acid as well as ammonia and amines such as trimethylamine and dimethylamine by a chemical reaction.

The second air passage 2 discharges the room air sucked from the inlet 2a from the outlet 2b. Second
A pre-filter 41, an alcohols removing filter 42, and a fan 43 are sequentially arranged in the air blowing passage 2 from the upstream side in the air blowing direction, and the alcohols removing unit 4 is configured by them. The pre-filter 41 is
Consisting of non-woven fabric and nylon, it removes particulate matter in the air. The alcohols removing filter 42 has a two-layer structure of honeycomb-shaped activated carbon (untreated) and chemically impregnated activated carbon whose surface is activated. The alcohol removal filter 42 adsorbs ethyl alcohol and other organic gases (acetaldehyde and the like) by the former layer, and ammonia, amines such as dimethylamine and trimethylamine, and lower fatty acids and the like by the latter layer. The fan 43 is a sirocco fan and is driven by a motor 44 to generate an airflow from the inlet 2a to the outlet 2b.

As the gas sensor 5, a known hot-wire type semiconductor type ethanol sensor is used in a room filled with perfume, and a known infrared absorption type CO sensor is used in a room filled with tobacco combustion gas. Is used. In a room filled with both perfume and cigarette smoke, both sensors are used. The hot-wire semiconductor type ethanol sensor can be configured by penetrating a platinum wire coil through a metal oxide semiconductor (for example, SnO ³ ), and changes in heat conduction and electric conduction due to gas adsorption on the surface of the metal oxide semiconductor. Degree change,
It is detected as a resistance change at both ends of the platinum coil. In this case, the platinum wire coil has both a function as a heater for heating the metal oxide semiconductor to 300 to 450 ° C. and a function as a signal detection electrode.

By the way, about 90% of cologne
Is ethanol, but if 1 g of ethanol is volatilized in a room equivalent to 6 tatami mats (23 m ³ ), the concentration of ethanol will be 21 ppm, which is above the detectable level of the ethanol sensor of 10 ppm, so it can be detected. Become. On the other hand, one cigarette emits 20 mg of carbon monoxide gas, which is equivalent to 6 tatami mats (23 m ³ ) and is 0.
The concentration is 695 ppm, which can be detected by an infrared absorption type CO sensor. The gas sensor 5 is preferably installed in a room at a position where the gas to be detected is most likely to accumulate.

On the other hand, a gas sensor 8 having the same structure as the gas sensor 5 is arranged near the outlet 2b of the second air passage 2. This gas sensor 8 is connected to a notifying means (not shown) (buzzer, lamp blinking, etc.),
When the gas concentration of ethanol or the like exceeds a predetermined value, this is notified. The control means 6 includes a switching means 61 for switching the driving so as to selectively drive the ozone deodorizing section 3 and the alcohols removing section 4.
When the value detected by the gas sensor 5 exceeds a predetermined value due to the switching by the switching means 61, the motor 44 for driving the fan 43 is driven to drive the alcohol removing unit 4 and the detected value is predetermined. When the value is less than the value, the ozone deodorizing unit 3 is driven by driving the high voltage generator 32b of the ozone generator 32 and the motor 36 for driving the fan 34.

According to this embodiment, when the concentration of a gas such as ethanol which may cause a bad smell increases and exceeds a predetermined value, the ozone deodorizing section 3 is stopped and the bad smell is generated by the oxidation of ethanol. Can be avoided.
Further, while the ozone deodorizing unit 3 is stopped, the alcohol removing unit 4 is driven to remove alcohols, the gas concentration of ethanol or the like is reduced to a predetermined value or less, and the ozone deodorizing unit 3 is driven again. It is possible to return to the normal state that is performed at an early stage.

FIG. 2 shows another embodiment of the present invention. This embodiment is different from the embodiment shown in FIG. 1 in that a ventilation fan 7 as a ventilation means for exhausting indoor air to the outside is provided on the wall of the room, and the control means 6 is provided with the gas sensor 5 described above.
If the detection value exceeds the predetermined value, the ventilation fan 7 is driven to discharge indoor air containing ethanol and the like to the outside, and when the detection value becomes less than the predetermined value, the ventilation control means 62 stops the drive of the ventilation fan 7. It is included. Therefore, referring to the time chart of FIG. 3, when the value detected by the gas sensor 5 exceeds a predetermined value, the driving of the ozone deodorizing unit 3 is stopped and the alcohol removing unit 4 and the ventilation fan 7 are driven. ..

The driving start timing a of the alcohols removing section 4 is set at a time point when a predetermined offset time T has elapsed from the stop timing b of the ozone deodorizing section 3. This is because the removal of alcohol in the room is mainly performed by ventilation by the ventilation fan 7, and the alcohol removal unit 4 is responsible for removal of only the remaining alcohol. Thereby, the life of the alcohol removal filter 42 of the alcohol removal unit 4 can be extended.

According to this embodiment, in addition to the same effect as that of the embodiment of FIG. 1, alcohols that cause a bad smell are discharged to the outside of the room.
Can be shortened, and the life of the alcohol removal filter 42 can be extended. FIG. 4 shows another embodiment of the present invention. This embodiment differs from the embodiment of FIG. 1 in that
i) omitting the configuration of the air passage 2, ii) a filter 31 for removing particulate matter in the ozone deodorizing section 3 in the air passage 1,
A filter 42 for removing alcohols is disposed between the ozone generator 32 and the ozone generating electrode 32a, and
iii) Instead of the switching means 61 of the control means 6, when the value detected by the gas sensor 5 exceeds a predetermined value, the ozone generator 32
That is, the ozone generation control means 63 for stopping the driving of is provided. In this embodiment, the parts of the prefilter 41 and the fan 43 of the alcohol removing section 4 of the embodiment of FIG. 1 are also used as the prefilter 31 and the fan 34 of the ozone deodorizing section 3.

According to this embodiment, when the gas concentration exceeds a predetermined value, the ozone generation control means 63 stops driving the ozone generator 32 while the fan 34 is driven, so that the malodor is generated due to the oxidation of alcohols. Prevent.
Then, when alcohols are removed by the alcohols removal filter 42 and the gas concentration becomes less than a predetermined value, ozone deodorization is performed again. Since the alcohols removal filter 42 is arranged on the upstream side of the ozone generator 32 in the blowing direction, the amount of alcohols supplied to the ozone decomposition catalyst 33 side can be significantly reduced. Further, since the air purifying device has only a single air passage 1, the air purifying device can be downsized, and the combined use of the above components can reduce the number of components and reduce the manufacturing cost.

FIG. 5 shows still another embodiment of the present invention. This embodiment differs from the embodiment of FIG. 2 in that
i) Omission of the alcohol removing section 4, ii) Provision of a ventilation fan 7 as ventilation means for discharging indoor air to the outside, iii) Instead of the switching means 61 of the control means 6, a value detected by the gas sensor 5 When the value exceeds a predetermined value, the ventilation control means 62 for driving the ventilation fan 7 and the ozone generation control means 63 for stopping the driving of the ozone generator 32 when the detection value by the gas sensor 5 exceeds the predetermined value are provided.

According to this embodiment, when the gas concentration of ethanol or the like exceeds a predetermined value, the ozone generation control means 63 stops driving the ozone generator 32 and the ventilation control means 62 drives the ventilation fan 7. Therefore, it is possible to prevent the generation of a bad odor due to the oxidation of alcohols, and to discharge the room air containing alcohols to the outside to quickly restore the normal state of ozone deodorization. In this embodiment, the ozone generator 3
When the driving of the fan 2 is stopped, it is preferable that the driving of the fan 34 is also stopped. In addition, the pre-filter 31
An alcohol removing filter 42 may be provided between the ozone generating electrode 32a of the ozone generator 32 and the ozone generating electrode 32a.

The present invention is not limited to the above embodiments, and for example, the gas sensor 5 is arranged inside the air cleaning device at a position upstream of the ozone decomposition catalyst 33 in the air blowing direction. It is possible to make various design changes within the range that does not change the gist of the present invention.

[0027]

As described above, according to the first aspect of the present invention, when the concentration of gas such as ethanol exceeds a predetermined value, the ozone deodorizing unit is stopped and the alcohol removing unit is driven. Thus, it is possible to prevent the generation of a bad odor due to the oxidation of alcohols, reduce the gas concentration in the room to less than a predetermined value in an early stage, and restore the normal state in which only the ozone deodorizing unit is driven again to an early stage.

According to the invention of claim 2, in addition to the effect of the invention of claim 1, since the indoor air is discharged to the outside by the ventilation means, the gas concentration in the room can be efficiently lowered, and the ozone It is possible to return to a normal state in which the deodorizing unit is driven earlier. According to the invention of claim 3, when the gas concentration exceeds a predetermined value, the ozone generation control means stops driving the ozone generator.
It is possible to prevent the generation of a bad odor due to the oxidation of alcohols. Since the structure has only a single air passage, the air cleaning device can be downsized, and the number of parts can be reduced and the manufacturing cost can be reduced as compared with the case where two air passages are provided. ..

According to the fourth aspect of the present invention, when the gas concentration exceeds a predetermined value, the ozone generation control means stops the driving of the ozone generator and the ventilation control means drives the ventilation means, whereby alcohols are discharged. It is possible to prevent the generation of a foul odor due to the oxidation of, and to discharge the room air containing alcohols to the outside to quickly return to the normal state where ozone deodorization is performed.

[Brief description of drawings]

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

FIG. 2 is a schematic configuration diagram of an air cleaning device according to another embodiment of the present invention.

FIG. 3 is a diagram showing a timing chart of the operation.

FIG. 4 is a schematic configuration diagram of an air cleaner according to still another embodiment of the present invention.

FIG. 5 is a schematic configuration diagram of an air cleaning device according to still another embodiment of the present invention.

[Explanation of symbols]

 1, 2 Blower 3 Ozone deodorizing section 32 Ozone generator 33 Ozone decomposing catalyst 4 Alcohol removing section 42 Alcohol removing filter 5 Gas sensor 61 Switching means 62 Ventilation control means 62 Ozone generation control means 7 Ventilation fan (Ventilation means)

Continuation of front page (51) Int.Cl. ⁵ Identification number Office reference number FI technical display location F24F 7/00 B 6925-3L

Claims (4)

[Claims] 1. A first and a second configured independently of each other.
Air ducts (1, 2), and an ozone generator (32) for generating ozone for deodorizing indoor air sent through the first air duct (1),
And an ozone deodorizing section (3) having an ozone decomposing catalyst (33) for decomposing ozone, a gas sensor (5) for detecting the gas concentration of at least one of ethanol and carbon monoxide, and the second air passage (2). ) And an alcohols removing section (4) including a filter (42) for removing alcohols, and the alcohols removing section (4) is driven in a state where the detection value by the gas sensor (5) exceeds a predetermined value. Then, in order to drive the ozone deodorizing section (3) when the detected value is less than the predetermined value,
An air cleaning device comprising: a switching means (61) for selectively switching between driving of an ozone deodorizing section (3) and an alcohols removing section (4). 2. A ventilation means (7) for exhausting indoor air to the outside, and when the detection value by the gas sensor (5) exceeds a predetermined value, the ventilation means (7) is driven so that the detection value falls below the predetermined value. Then, the ventilation control means (62) for stopping the drive of the ventilation means (7)
The air cleaning apparatus according to claim 1, further comprising: 3. An ozone generator (3) for generating ozone for deodorizing indoor air sent through the air passage (1).
2), and an ozone decomposition catalyst (3) for decomposing the ozone.
In the air cleaning device having 3), a gas sensor (5) for detecting the gas concentration of at least one of ethanol and carbon monoxide, and an upstream side in the air blowing direction of the ozone generator (32) in the air blowing passage (1). And an ozone generation control means (63) for stopping the driving of the ozone generator (32) when the value detected by the gas sensor (5) exceeds a predetermined value. An air purifier characterized by that. 4. An air purification apparatus having an ozone generator (32) for generating ozone for deodorizing indoor air, and an ozone decomposition catalyst (33) for decomposing ozone, wherein at least ethanol and carbon monoxide are used. A gas sensor (5) for detecting one of the gas concentrations, a ventilation means (7) for discharging the air in the room to the outside, and an ozone generator (32) of the ozone generator (32) when the value detected by the gas sensor (5) exceeds a predetermined value. When the detection value by the ozone generation control means (63) for stopping the driving and the gas sensor (5) exceeds a predetermined value, the ventilation means (7) is driven, and when the detected concentration becomes less than the predetermined value, the ventilation means (7) Ventilation control means for stopping driving (6
2) An air cleaning device comprising: