KR20120073281A - Fibrous filter and air purification device - Google Patents

Abstract

An object of the present invention is to provide a fiber filter capable of improving the strength of the photocatalyst layer and an air cleaner using the fiber filter. Therefore, the titanium dioxide particles 2 are placed on the fiber filter main body 1 composed of aluminum fibers having a diameter of 50 µm to 500 µm, a neck portion of 500 g / m ² to 10000 g / m ^2, and a porosity of 50% to 90%. By spraying, a titanium dioxide film having anatase crystal structure of 70% by mass or more is formed.

Description

Fiber Filters & Air Purifiers {FIBROUS FILTER AND AIR PURIFICATION DEVICE}

The present invention relates to a fiber filter and an air cleaner. Specifically, the present invention relates to a fiber filter having a photocatalytic function capable of performing harmlessness, antibacterial and sterilization of contaminants, and an air cleaner using the fiber filter.

With the progress of an aging society, the proportion of elderly people with reduced immunity tends to increase in the total population. Therefore, the reinforcement of hygiene management at medical sites, food production, and processing sites from the viewpoint of prevention of infections and food poisoning. Has become a very important task. Based on this social background, various antimicrobial processed products have been developed, and in recent years, the use of the photocatalytic function for antimicrobial processing has attracted special attention.

Here, the term "photocatalytic function" means a catalytic substance that, when light energy greater than the band gap energy of the conduction and valence bands is irradiated, becomes excited and generates electron-hole bands, causing oxidation and reduction reactions ( Optical semiconductor material).

Among the photocatalysts, in particular, photocatalysts using titanium dioxide (TiO ₂ ) are inexpensive, have excellent chemical stability, and have a high catalytic activity. It can also decompose harmful substances such as toxin (for example, Vero toxin produced by Escherichia coli), and the photocatalyst itself has the advantage of being harmless to the human body.

Therefore, research and application of the photocatalyst using titanium dioxide are performed, and the titanium dioxide photocatalyst is widely used for antimicrobial processing of food containers, building materials, etc. (for example, refer patent document 1 and patent document 2). ).

Furthermore, since titanium dioxide expresses photocatalytic activity only under ultraviolet irradiation, it does not express sufficient catalytic activity under room light containing almost no ultraviolet component. For this reason, titanium dioxide doped with atoms such as nitrogen, carbon, and sulfur in crystal lattice has been proposed as a photocatalyst which exhibits photocatalytic activity under visible light irradiation. Particularly, sulfur-doped titanium dioxide has a high absorption coefficient in the visible region. It is known to have high catalytic activity in visible light (for example, refer patent document 3).

However, conventionally, a photocatalyst filter in which a photocatalyst is supported on a ceramic porous body has been applied to an air conditioner, an air cleaner, a water treatment device, and the like.

For example, Patent Document 4 discloses that titanium oxide supported on a ceramic porous body is irradiated with ultraviolet rays to remove gas odor by photocatalytic action of titanium oxide.

In addition, in the conventional photocatalyst filter, the photocatalyst layer was formed in the surface of the porous ceramic filter by dipping into the photocatalyst coating liquid (for example, refer patent document 4 and patent document 5).

Patent Document 1: Japanese Patent Application Laid-Open No. 2007-51263 Patent Document 2: Japanese Patent Application Laid-Open No. 2006-346651 Patent Document 3: Japanese Patent Application Laid-Open No. 2004-143032 Patent Document 4: Japanese Patent Laid-Open No. 3-157125 Patent Document 5: Japanese Patent Application Laid-Open No. 2005-349309

However, since the photocatalyst layer (dipping layer) formed by dipping was dense, even if a small bending stress was added to the filter, cracks were likely to occur (see Fig. 1 (b)). In Fig. 1 (b), reference numeral 101 denotes a porous ceramic filter, 102 denotes a dipping layer, and 103 denotes a crack.

The present invention was made in view of the above points, and an object thereof is to provide a fiber filter capable of improving the strength of a photocatalyst layer and an air cleaner using such a fiber filter.

In order to achieve the above object, in the fiber filter according to the present invention, a fiber filter body composed of fibers having a diameter of 50 μm to 500 μm and having a porosity of 50% to 90%, and a film formed by thermal spraying on the surface of the fiber It has a titanium dioxide film.

In addition, in order to achieve the above object, in the air purifier according to the present invention, a fiber filter body composed of fibers having a diameter of 50 µm to 500 µm and a porosity of 50% to 90%, And a light source for irradiating light to the fiber filter having a titanium dioxide film formed by the film filter.

Furthermore, in the air purifier according to the present invention, the fiber filter body composed of aluminum fibers having a diameter of 50 μm to 500 μm, a neck weight of 500 g / m ² to 10000 g / m ^2, and a porosity of 50% to 90% And a fiber filter having a titanium dioxide coating on which the surface of the fiber is formed by thermal spraying technology and carrying 0.1 mass% to 10 mass% of antibacterial metal, and a light source for irradiating light to the fiber filter.

Here, the titanium dioxide film is formed by the thermal spraying technique so that titanium dioxide particles are deposited on the surface of the fiber, and the titanium dioxide film is formed. On the upper layer, the titanium dioxide film is formed in the state of partial sintering due to the thermal spraying, so that it is difficult to cause cleavage. The durability can be improved.

That is, the titanium dioxide film on the surface of the fiber filter main body is in a state in which titanium dioxide particles are stuck to the surface of the fiber filter main body, and high adhesion between the fiber filter main body and the titanium dioxide film is realized by the anchor effect. For the titanium dioxide film laminated on the upper layer, high adhesion is achieved by partially sintering the titanium dioxide particles.

In addition, when the diameter of the fiber constituting the fiber filter main body is less than 50 µm, the strength of the fiber filter main body is not sufficient, the film formation of the titanium dioxide film by the thermal spraying technique is difficult, and the yield decreases.

On the other hand, when the diameter of the fiber which comprises a fiber filter main body exceeds 500 micrometers, the amount of fibers which occupy in a predetermined space will become too much. In addition, the fiber is excessively present in a certain space, so that the existence area of the titanium dioxide film is not sufficiently secured, and the ratio of the titanium dioxide film in the predetermined space is too small, making it difficult to fully exhibit the photocatalytic function of the titanium dioxide film.

Therefore, the diameter of the fiber which comprises a fiber filter main body is 50 micrometers-500 micrometers. In addition, it is preferable that the diameter of the fiber which comprises a fiber filter main body is 100 micrometers-200 micrometers.

In addition, when the porosity of the fiber filter main body is less than 50%, the air resistance becomes too large, making it difficult for air to pass through the fiber filter main body, making it difficult for the harmful substances (decomposed substances) and the titanium dioxide film to come into contact with each other. This means that when the fiber filter main body is used for an air cleaner, it becomes difficult to fully fulfill the function as an air cleaner.

On the other hand, when the porosity of the fiber filter main body exceeds 90%, the amount of fibers occupying in a certain space is too small. In consideration of the fact that the titanium dioxide film is formed on the surface of the fiber, the amount of the fiber is too small to form the titanium dioxide film in a certain space, and it becomes difficult to sufficiently exhibit the photocatalytic function of the titanium dioxide film.

Therefore, the porosity of the fiber filter main body is made into 50%-90%. In addition, the porosity of the fiber filter body is preferably 60% to 80%.

However, titanium dioxide has a crystal structure of anatase type and rutile type, and it is known that anatase type titanium dioxide has a higher photocatalytic function than rutile type titanium dioxide. Therefore, a high photocatalytic function can be realized by forming a titanium dioxide film so that the anatase type crystal structure becomes 70 mass% or more. However, since anatase type titanium dioxide is generally expensive compared with rutile type titanium dioxide, it is preferable to employ rutile type titanium dioxide when focusing on cost.

Furthermore, the titanium dioxide of the visible light response type may be doped in the crystal lattice of titanium dioxide by doping sulfur, carbon, nitrogen, or the like, or a sensitizer, which is at least one compound selected from metal complexes or metal salts such as iron, copper, chromium, and nickel. This is realized, and it is also possible to employ such a visible light-response titanium dioxide.

Further, the antibacterial metal (for example, Ag, Cu, Ni, Co, Zn, etc.) is supported on the titanium dioxide film to further increase the antibacterial action. In addition, if there are too few antibacterial metals, an antimicrobial effect will not be exhibited, and also if there are too many antibacterial metals, an antimicrobial effect will fall rather. Therefore, it is preferable that 0.1 mass%-10 mass% antimicrobial metal is supported by a titanium dioxide film.

However, when the neck amount of the fiber filter body is less than 500 g / m ² , the amount of fibers per unit area is too small. In consideration of the fact that the titanium dioxide film is formed on the surface of the fiber, the amount of fiber is too small, and the amount of film formation of the titanium dioxide film per unit area is not sufficient, and it is difficult to sufficiently exhibit the photocatalytic function of the titanium dioxide film.

On the other hand, if the neck amount of the fiber filter body exceeds 10000 g / m ² , the amount of fibers per unit area becomes too large. The excessive amount of fibers in the unit area prevents the sufficient area of the titanium dioxide film from being secured, and the proportion of the titanium dioxide film per unit area becomes too small, making it difficult to sufficiently exhibit the photocatalytic function of the titanium dioxide film.

Thus the neck and the quantification of the fiber filter body to ^{500g / m 2 ~ 10000g / m} 2. In addition, the amount of the neck of the fiber filter body is preferable a ^{500g / m 2 ~ 3000g / m} 2.

In addition, as a fiber which comprises a fiber filter main body, metal fiber (for example, aluminum fiber, stainless steel fiber, nickel fiber, etc.), inorganic fiber (for example, glass fiber, carbon fiber, alumina fiber, ceramic fiber, rock fiber, slag) Fiber, etc.), organic fiber (for example, plastic fiber), etc. are mentioned.

Examples of the light source for irradiating light to the fiber filter include black light, ultraviolet LED lamp, visible light LED lamp, fluorescent lamp, incandescent lamp, cold cathode tube (CCFL: Cold Cathode Fluorescent Lamp) and the like.

In the fiber filter and the air cleaner to which the present invention is applied, the high intensity of the photocatalyst layer is realized by reducing the cleavage of the titanium dioxide film and improving the durability.

BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic diagram for demonstrating the structure of a photocatalyst layer.
2 is a schematic diagram for explaining an example of an air cleaner to which the present invention is applied.
3 is a schematic diagram for explaining another example of the air cleaner to which the present invention is applied.
4 is a schematic view for explaining another example of an air cleaner to which the present invention is applied.

EMBODIMENT OF THE INVENTION Hereinafter, it demonstrates, referring drawings in the form for implementing invention (henceforth "embodiment".). In addition, description is given in the following procedure.

1. First embodiment (about fiber filter 1)

2. Second embodiment (about fiber filter 2)

3. Third embodiment (about fiber filter 3)

4. Fourth embodiment (about air cleaner (1))

5. Embodiment (about air cleaner (2)) of the fifth

6. Sixth embodiment (about air cleaner (3))

7. Seventh embodiment (about air cleaner (4))

8. Embodiment (about air cleaner 5) of the eighth embodiment

<1. First embodiment>

Fig. 1 (a) is a schematic diagram for explaining an example of the fiber filter to which the present invention is applied, and the fiber filter indicated here has a titanium dioxide film formed on the surface of the fiber filter main body 1 and the fiber filter main body 1.

The fiber filter main body 1 is comprised from the fiber made from aluminum of 50 micrometers-500 micrometers in diameter (Hereinafter, the aluminum fiber which comprises the fiber filter main body 1 is called "aluminum fiber."), 500g / m ² ~ 10000g / m ² and porosity is 50% ~ 90%.

The titanium dioxide film is formed by colliding the titanium dioxide particles 2, which are photocatalyst particles, with the surface of the fiber filter main body using a thermal spraying technique. In addition, the high speed thermal spraying of the thermal spraying temperature variable described in Unexamined-Japanese-Patent No. 2005-68457 can be used, for example in film-forming of a titanium dioxide film.

Here, the titanium dioxide film of the present embodiment is formed by colliding the titanium dioxide particles 2 with the fiber filter main body 1 using a thermal spraying technique, so that the titanium dioxide particles 2 are stuck to the surface of the aluminum fiber. As a result, a titanium dioxide film is formed (see titanium dioxide particles indicated by reference numeral g in FIG. 1A), and high adhesion between the aluminum fiber and the titanium dioxide particles 2 can be realized by the anchor effect.

In addition, the titanium dioxide particles 2 are partially sintered by heat during thermal spraying (see titanium dioxide particles indicated by the symbol h in Fig. 1 (a)), and accordingly, high adhesion between the titanium dioxide particles 2 is achieved. Can be realized.

Therefore, compared with the photocatalyst layer formed by dipping, even if a bending stress is added to the fiber filter main body 1, a crack hardly arises and the improvement of the intensity | strength of a photocatalyst layer (titanium dioxide film) can be realized.

The gap between the aluminum fibers is extremely short compared to the diameter of the hole (corresponding to the gap between the aluminum fibers) in the conventional porous ceramic filter. As a result, the distance between the harmful substance (the substance to be degraded) passing through the fiber filter and the titanium dioxide coating is short, and the harmful substance is easily in contact with the titanium dioxide coating, and the distance between the harmful substance and the titanium dioxide coating is also short. The concentration gradient of is increased and the sum of mobility of harmful substances is increased.

Therefore, compared with the case where a porous ceramic filter is used, the fiber filter of 1st Embodiment can expect the improvement of gas decomposition performance.

Table 1 and Table 2 show the results of the decomposition test of acetaldehyde using the "filter in which the photocatalytic layer was formed by dipping in a porous ceramic filter" and the decomposition test result of acetaldehyde using the fiber filter of the first embodiment. have.

Specifically, Table 1 shows the decrease in acetaldehyde concentration over time, and the decomposition test of acetaldehyde using "filter in which a photocatalytic layer was formed by dipping in a porous ceramic filter" (indicated by symbol i in Table 1). In 4 hours, 80 ppm of acetaldehyde decreased, whereas in the decomposition test of acetaldehyde using the fiber filter of the first embodiment (indicated by symbol j in Table 1), 90 ppm of acetaldehyde decreased in 2 hours. have.

In addition, carbon dioxide is generated when acetaldehyde is decomposed, and Table 2 shows generation of carbon dioxide over time, and decomposition test of acetaldehyde using `` a filter in which a photocatalytic layer is formed by dipping into a porous ceramic filter '' ( In Table 2, 130 ppm of carbon dioxide is generated in 2 hours, whereas in the decomposition test of acetaldehyde using the fiber filter of the first embodiment (indicated by symbol j in Table 2) in 2 hours, 150 ppm of carbon dioxide is generated.

Table 3 shows the results of the decomposition test of formaldehyde (shown by symbol m in Table 3) and the decomposition test results of acetaldehyde (with reference symbol n in Table 3) using "filter in which photocatalytic layer was formed by dipping in porous ceramic filter". Is shown. Specifically, the relationship between time and concentration is shown.

In addition, Table 4 shows the results of the decomposition test of formaldehyde using the fiber filter of the first embodiment (shown by code m in Table 4) and the decomposition test results of acetaldehyde (shown by code n in Table 4). have. Specifically, the relationship between time and concentration is shown.

From the results of Tables 1 to 4, it can be seen that the fiber filter of the first embodiment clearly improves the gas decomposition performance as compared with the "filter in which the photocatalytic layer was formed by dipping in the porous ceramic filter". .

Thus, the fiber filter of 1st Embodiment is excellent in decomposition performance (gas decomposition) and durability compared with "the filter which formed the photocatalyst layer by dipping in a porous ceramic filter."

In addition, since the fiber filter of the first embodiment can be manufactured very thinly, a fiber filter of 1 mm to 7 mm can be generally realized, so that a filter having a photocatalytic layer formed by dipping into a porous ceramic filter having a thickness of 10 mm or more. Compared with ", it is also excellent in space saving. In addition, it is excellent in workability because it is thin.

Here, although this embodiment demonstrates aluminum fiber as an example, it does not necessarily need to be an aluminum material with respect to the material of a fiber filter main body, It may be comprised from metal materials, such as copper, nickel, titanium, and stainless steel, and If the fiber filter main body can be formed, it may be made of a nonmetallic material such as glass.

<2. Second embodiment>

In another example of the fiber filter to which the present invention is applied, it has a titanium dioxide film formed on the surface of the fiber filter main body 1 and the fiber filter main body 1 (refer to FIG. 1 (a)). This point is the same as that of 1st Embodiment mentioned above. In addition, the titanium dioxide film of this embodiment carries 1 mass% Ag.

The fiber filter main body 1 is comprised from the aluminum fiber of 50 micrometers-500 micrometers in diameter similarly to 1st Embodiment mentioned above, and has a neck weight of 500g / m <^2> -10000g / m <^2> and a porosity of 50%- 90%.

The titanium dioxide film is formed by colliding titanium dioxide particles (2), which are photocatalyst particles, and Ag particles, which are antibacterial materials, on the surface of the fiber filter body using a thermal spraying technique. In addition, it is the same as that of 1st Embodiment mentioned above that the high temperature spraying-spray of the thermal spraying temperature variable as described in Unexamined-Japanese-Patent No. 2005-68457 can be used for film-forming of a titanium dioxide film, for example.

Here, in the present embodiment, the titanium dioxide particles 2 and the antibacterial metal (eg Ag particles, etc.) are collided with the surface of the fiber filter main body by using a thermal spraying technique, thereby supporting the Ag particles simultaneously with the formation of the titanium dioxide film. The explanation is given taking the case of making it take as an example. However, it is sufficient that the Ag particles can be supported on the titanium dioxide film, and the Ag particles may be supported by any method.

For example, particles of Ag or the like may be supported by colliding titanium dioxide particles obtained by initially impregnating particles such as Ag on the surface of the fiber filter main body using a thermal spraying technique. In addition, after forming the titanium dioxide film, Ag ions or the like may be supported by an ultraviolet light deposition method or the like.

By the way, E. coli bactericidal performance test using Escherichia coli as an assay bacterium was conducted to examine the antimicrobial effect of the fiber filter of the present embodiment. It can be confirmed that it can be rapidly reduced to).

Table 5 also shows the results of decomposition test of acetaldehyde using a "filter in which a photocatalytic layer was formed by dipping in a porous ceramic filter" (indicated by reference symbol a in Table 5) and the acet using the fiber filter of the second embodiment. The result (represented by the code | symbol b in Table 5) of the decomposition test of an aldehyde is shown. Specifically, the relationship between time and concentration is shown.

From the results in Table 5, it can be seen that the fiber filter of the second embodiment can decompose acetaldehyde, which is a kind of VOC, to water and carbon dioxide to a low concentration (about 1 billionth).

In the present embodiment, an explanation is given taking Ag as an example, but the antibacterial metal carried by the titanium dioxide film does not necessarily need to be Ag, and other antibacterial metals may be used.

<3. Third embodiment>

Another example of the fiber filter to which the present invention is applied has a titanium dioxide film formed on the surface of the fiber filter main body 1 and the fiber filter main body 1 (see Fig. 1 (a)). This point is the same as that of 1st Embodiment mentioned above. In addition, the titanium dioxide film of this embodiment carries 12.5 mass% zeolite (an example of an adsorption material).

The fiber filter main body 1 is comprised from the aluminum fiber of 50 micrometers-500 micrometers in diameter similar to 1st Embodiment mentioned above, and has a neck weight of 500g / m <^2> -10000g / m <^2> , and the porosity is 50%. ~ 90%.

The titanium dioxide film is formed by colliding titanium dioxide particles 2, which are photocatalyst particles, and zeolite, which is an adsorbent, on the surface of the fiber filter main body by thermal spraying. In addition, it is the same as that of 1st Embodiment mentioned above that the high temperature thermal spraying apparatus of the thermal spraying temperature variable of Unexamined-Japanese-Patent No. 2005-68457 can be used for film-forming of a titanium dioxide film, for example.

In this embodiment, the case where the zeolite is supported simultaneously with the film formation of the titanium dioxide film by colliding the titanium dioxide particles 2 and the adsorbent (for example, zeolite) with the surface of the fiber filter main body using a thermal spraying technique is described. As an example, explanation is given. However, it is sufficient if the zeolite can be supported on the titanium dioxide film, and the zeolite may be supported by any method.

By the way, the decomposition test result of acetaldehyde using the fiber filter of this embodiment (shown with code | symbol A in Table 6), and the decomposition test result of acetaldehyde using the fiber filter which does not carry the zeolite (to code B in Table 6) Table 6 is shown. Specifically, the relationship between time and concentration is shown.

From the results in Table 6, it can be seen that by supporting the zeolite, the decomposition rate of acetaldehyde almost three times is realized.

Here, in this embodiment, although the case where a zeolite is supported is demonstrated as an example, the adsorption material on which a titanium dioxide film is carried is not necessarily zeolite, but other adsorption materials, such as apatite and activated carbon, may be sufficient as it.

<4. Fourth embodiment>

2 is a schematic view for explaining an example of an air cleaner to which the present invention is applied. In the air cleaner 10, a fan 11 is disposed below the inside, and an ultraviolet LED lamp (above the fan 11 is disposed above). 12 is disposed, and the fiber filter 13 is further disposed above the ultraviolet LED lamp 12.

The fan 11 is comprised so that air can be blown upwards, and as the fan 11 rotates, the flow of the air which intakes from the bottom of the air cleaner 10 and exhausts it from above is formed.

The ultraviolet LED lamp 12 is comprised so that light having a wavelength of 365 nm can be irradiated toward the fiber filter 13, and the photocatalytic function of the fiber filter 13 is exhibited by the light from the ultraviolet LED lamp 12. Will be.

The fiber filter 13 uses the fiber filter of 2nd Embodiment mentioned above.

In the air cleaner 10 configured as described above, air containing bacteria, viruses, VOC gas or harmful gas is sucked in from the lower side by the intake action caused by the fan 11 rotating. The sucked air passes through the fiber filter 13, whereby bacteria, viruses, VOC gas and harmful gases are decomposed and sterilized, and exhausted from above as clean air.

Table 7 shows the results of the decomposition test of ammonia using the "ionic air cleaner" (indicated by symbol c in Table 7) and the results of the decomposition test of ammonia using the air cleaner of the fourth embodiment (in code d in Table 7). Is shown. Specifically, the relationship between time and concentration is shown.

Table 8 shows the results of the decomposition test of acetaldehyde using the "ionic air purifier" (indicated by code c in Table 8) and the results of the decomposition test of acetaldehyde using the air cleaner of the fourth embodiment (Table 8 Is indicated by symbol d). Specifically, the relationship between time and concentration is shown.

From the results of Tables 7 and 8, it can be seen that the air cleaner of the fourth embodiment can decompose ammonia, which is a bad smelling component, and acetaldehyde, a kind of VOC, to low concentrations.

<5. Fifth Embodiment>

3 is a schematic diagram for explaining another example of the air cleaner to which the present invention is applied. In the air cleaner 10 shown here, a fan 11 is disposed below the inside of the air cleaner, and a visible light LED is disposed above the fan 11. The lamp 14 is arranged, and the fiber filter 13 is disposed above the visible light LED lamp 14.

The fan 11 is configured to be capable of blowing upward, and the fan 11 rotates, whereby a flow of air intakes from the bottom of the air cleaner 10 and exhausts from above is formed. Same as the embodiment of.

The visible light LED lamp 14 is configured to irradiate light having a wavelength of 415 nm toward the fiber filter 13 so that the photocatalytic function of the fiber filter 13 is exerted by the light from the visible light LED lamp 14. do.

The fiber filter 13 uses the fiber filter of 2nd Embodiment mentioned above.

In the air cleaner 10 configured as described above, air containing bacteria, viruses, VOC gas or harmful gas is sucked in from the lower side by the intake action by the fan 11 rotating. The sucked air passes through the fiber filter 13, whereby bacteria, viruses, VOC gas and harmful gases are decomposed and sterilized, and exhausted from above as clean air.

Table 9 shows the results of the decomposition test of ammonia using the "ion-type air cleaner" (indicated by code e in Table 9) and the results of the decomposition test of ammonia using the air cleaner of the fifth embodiment (Code in Table 9) f). Specifically, the relationship between time and concentration is shown.

Table 10 shows the results of the decomposition test of acetaldehyde using the "ionic air purifier" (indicated by code e in Table 10) and the results of the decomposition test of acetaldehyde using the air cleaner of the fifth embodiment (in Table 10). And symbol f). Specifically, the relationship between time and concentration is shown.

From Table 9 and Table 10, it can be seen that the air cleaner of the fifth embodiment can decompose ammonia, which is a bad smell component, and acetaldehyde, a kind of VOC, to low concentrations.

Moreover, since visible light is used as a light source, it is good for human eyes, skin, and the like. Moreover, since the visible light LED lamp is already distributed in large quantities and can be obtained at very low cost, the air cleaner of the fifth embodiment can be realized at low cost.

<6. Sixth embodiment>

4 (a) is a schematic diagram for explaining another example of the air cleaner to which the present invention is applied, wherein the air cleaner shown here is disposed with a dust collecting filter 15 therein and is adjacent to the dust collecting filter 15. The part 16 is arrange | positioned and the fan 11 is arrange | positioned on the opposite side to the dust collecting filter 15 of the photocatalyst filter part 16. As shown in FIG.

The fan 11 is comprised so that the flow of air taken in from the dust collecting filter 15 side by rotation may be formed.

The photocatalyst filter part 16 is comprised by the black light 18 surrounded by the fiber filter 13 and the reflecting plate 17, as shown to FIG. 4 (b). In addition, the fiber filter 13 uses the fiber filter of the second embodiment described above, and the black light 18 is configured to emit UV sterilization lines having a wavelength of 254 nm and UV ozone rays having a wavelength of 185 nm. have.

In the above-described air cleaner, the fan 11 is rotated so that air containing bacteria, viruses, VOC gas or harmful gas is supplied to the photocatalyst filter unit 16. In the photocatalyst filter unit 16, the microorganism, virus, VOC gas and harmful gas are decomposed or sterilized by passing through the fiber filter 13, and exhausted as clean air.

Table 11 shows the results of the decomposition test of ammonia using the "ion + deodorization filter type air purifier" (indicated by symbol p in Table 11) and the result of the decomposition test of ammonia using the "active carbon type air purifier" (code q in Table 11). And the result of decomposition test of ammonia using the air cleaner of 6th Embodiment (it shows with the symbol r in Table 11). Specifically, the relationship between time and concentration is shown.

Table 12 shows the results of the decomposition test of acetaldehyde using "ion + deodorization filter type air purifier" (indicated by symbol p in Table 12) and the acetaldehyde decomposition test using "active carbon type air purifier" (in Table 12). The results of decomposition test of acetaldehyde using the air cleaner of the sixth embodiment (shown by code q) (shown by code r in Table 12) are shown. Specifically, the relationship between time and concentration is shown.

From Table 11 and Table 12, it can be seen that the air cleaner of the sixth embodiment can decompose ammonia, which is a bad smell component, and acetaldehyde, a kind of VOC, to low concentrations.

<7. Seventh embodiment>

In another example of the air cleaner to which the present invention is applied, the dust collecting filter 15 is disposed therein and the photocatalyst filter unit 16 is disposed adjacent to the dust collecting filter 15, as in the sixth embodiment described above. The fan 11 is arrange | positioned on the opposite side to the dust collecting filter 15 of the filter part 16 (refer FIG. 4 (a)).

In addition, the fan 11 is the same as that of 6th Embodiment mentioned above also about the point which is formed so that the air which intakes from the dust collecting filter 15 side by air may be formed.

As shown in FIG. 4B, the photocatalyst filter unit 16 is configured such that the black light 18 is surrounded by the fiber filter 13 and the reflecting plate 17. In addition, the fiber filter 13 uses the fiber filter of 2nd Embodiment mentioned above, and the black light 18 is comprised so that it may emit UV-ray which has a wavelength of 365 nm.

In the above-described air cleaner, the fan 11 is rotated so that air containing bacteria, viruses, VOC gas or harmful gas is supplied to the photocatalyst filter unit 16. In the photocatalyst filter unit 16, bacteria, viruses, VOC gases and harmful gases are decomposed, sterilized, and the like, passing through the fiber filter 13, and exhausted as clean air.

Table 13 shows the decomposition test results of acetaldehyde using the air cleaner of the sixth embodiment (indicated by symbol s in Table 13) and the decomposition test results of acetaldehyde using the air cleaner of the seventh embodiment (in Table 13 And a symbol t). Specifically, the relationship between time and concentration is shown.

Table 14 and Table 15 show the results of the complete decomposition performance test of VOC (acetaldehyde toluene) using the air cleaner of the seventh embodiment. In addition, the code | symbol u in Table 14 has shown acetaldehyde, the code | symbol # in Table 14 has shown carbon dioxide, the code u in Table 15 has shown toluene, and the code | symbol in Table 15 has shown carbon dioxide.

Table 13 shows that the air cleaner of the seventh embodiment is capable of decomposing acetaldehyde, which is a kind of odorous ammonia or VOC, at a lower concentration than the air cleaner of the sixth embodiment. Able to know. In addition, it can be seen from Table 14 and Table 15 that the air cleaner of the seventh embodiment has a very high decomposition performance of VOC.

<8. Eighth embodiment>

In another example of the air purifier to which the present invention is applied, the dust collecting filter 15 is disposed inside the same as the sixth embodiment described above, and the photocatalyst filter unit 16 is disposed adjacent to the dust collecting filter 15. It arrange | positions and the fan 11 is arrange | positioned on the opposite side to the dust collecting filter 15 of the photocatalyst filter part 16 (refer FIG. 4 (a)).

In addition, the fan 11 is the same as that of 6th Embodiment mentioned above also in the point which is comprised so that the flow of the air which intakes from the dust collecting filter 15 side by rotation may be formed.

As shown in Fig. 4C, the photocatalyst filter unit 16 is configured by the cold cathode tube 19 surrounded by the fiber filter 13. In addition, the fiber filter 13 uses the fiber filter of 2nd Embodiment mentioned above, and the cold cathode tube 19 is comprised so that the germicidal line which has a wavelength of 365 nm may be emitted.

In the air cleaner configured as described above, the fan 11 is rotated so that air containing bacteria, viruses, VOC gas or harmful gas is supplied to the photocatalyst filter unit 16. In the photocatalyst filter unit 16, bacteria, viruses, VOC gases and harmful gases are decomposed, sterilized, and the like, passing through the fiber filter 13, and exhausted as clean air.

Table 16 uses a commercially available air cleaner equipped with a photocatalyst (indicated by code C and D in Table 16) and air in case of using an air cleaner according to the eighth embodiment (indicated by E in Table 16). The result of the floating bacteria count after a purifier operation | operation is shown. Specifically, after spraying Bacillus subtilis in a 1000 L container, the air cleaner was operated, the air in the container was sucked with a pump, and the number of bacteria was measured.

As is apparent from Table 16, it can be seen that the air cleaner of the eighth embodiment has a very high decomposition and sterilization function of Bacillus subtilis.

1 Fiber filter body 2 Titanium dioxide particles
10 Air Purifiers 11 Fans
12 LED Lamps 13 Fiber Filter
14 Visible light LED lamp 15 Dust collection filter
16 Photocatalyst Filter Part 17 Reflector
18 Black Light 19 Cold Cathode

Claims (11)

A fiber filter comprising a fiber filter body composed of fibers having a diameter of 50 μm to 500 μm and having a porosity of 50% to 90%, and a titanium dioxide film formed by thermal spraying on the surface of the fiber. The method of claim 1,
The titanium dioxide film has anatase crystal structure of 70% by mass or more. The method of claim 1,
The titanium dioxide film has a rutile crystal structure and is a fiber filter carrying a sensitizer, which is at least one compound selected from a metal complex or metal salt of Fe, Cu, Cr, or Ni. The method according to claim 1, 2 or 3,
The titanium dioxide film is a fiber filter on which 0.1% by mass to 10% by mass of antibacterial metal is supported. The method of claim 4, wherein
The antimicrobial metal is a fiber filter including at least one of silver, copper, zinc, aluminum, nickel, cobalt, or iron metals. The method according to claim 1, 2 or 3,
The titanium dioxide coating is a fiber filter comprising at least one of apatite, zeolite or activated carbon. The method according to claim 1, 2 or 3,
The fiber filter main body is composed of metal fibers, inorganic fibers or organic fibers, the fiber amount of 500g / m ² ~ 10000g / m ² fiber filter. The method according to claim 1, 2 or 3,
The fiber filter body is composed of aluminum fibers, the fiber amount of 500g / m ² ~ 10000g / m ² fiber filter. A fiber filter composed of a fiber having a diameter of 50 μm to 500 μm and having a porosity of 50% to 90%, and a fiber filter having a titanium dioxide film formed by thermal spraying on the surface of the fiber; An air cleaner comprising a light source for irradiation. Soon as the diameter of the fiber is composed of aluminum 50㎛ ~ 500㎛ neck amount of ^{500g / m 2 ~ 10000g / m} 2 and a porosity is formed by the thermal spraying technique to a 50-90% fiber filter body and the surface of the fiber at the same time 0.1 An air purifier comprising a fiber filter having a titanium dioxide film on which an antibacterial metal of from 10% by mass to 10% by mass is supported, and a light source for irradiating light to the fiber filter. 11. The method according to claim 9 or 10,
The light source is any one of a black light, an ultraviolet LED lamp, a visible light LED lamp, a fluorescent lamp, an incandescent lamp, or a cold cathode tube emitting ultraviolet light.

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