JP6923918B2 - Photocatalyst-supported filter and mounted air purifier - Google Patents

Description

The present invention relates to a photocatalyst carrying filter and a mounted air purifier.

Photocatalysts that decompose and activate organic substances are attracting attention from the viewpoint of environmental purification. For example, Patent Document 1 describes a visible light-responsive three-dimensional fine cell structure photocatalytic filter in which a titanium oxide film is formed on the surface of a sponge-like porous structure made of carbon, silicon, or the like. Patent Document 2 includes a filter obtained by impregnating a polyurethane sponge with a phenol resin solution and silicon powder, and then carbonizing, reaction sintering, and further performing a Si melt impregnation treatment to coat a Si / SiC porous body with a photocatalyst. The photocatalyst purification device is described.
Further, Patent Document 3 describes a vehicle air purifier that includes a filter in which a photocatalyst is supported on a predetermined base material and is externally attached to an air conditioner outlet of a vehicle for use.

International Publication No. 2004/094044 Japanese Unexamined Patent Publication No. 2010-10715 Japanese Unexamined Patent Publication No. 2000-25450

The photocatalyst is excited by irradiation with ultraviolet rays to oxidatively decompose harmful substances in the air. In the photocatalyst purification device equipped with a photocatalyst-coated filter, the outside air taken into the device by the suction fan is captured, decomposed and removed by the photocatalyst coated on the filter of the sponge-like porous structure, and is clean. It becomes air and is discharged to the outside. At this time, when the photocatalyst is efficiently irradiated with ultraviolet rays, the photocatalytic action is activated.
However, in the case of a photocatalyst-supporting filter in which a photocatalyst is supported on the surface of a sponge-like porous structure, harmful substances passing through the photocatalyst-supporting filter come into contact with the photocatalyst, but ultraviolet energy reaches deep inside the sponge-like porous structure. There may be no tendency. Therefore, an inert portion may be generated in a part of the photocatalyst coated on the entire photocatalyst-supported filter, and the activation of the photocatalytic action may be inhibited.
An object of the present invention is to efficiently irradiate a photocatalyst carried on a solid substrate constituting a photocatalyst-supporting filter with ultraviolet energy to activate the photocatalytic action.
Further, as a method of using the photocatalyst-supported filter, there is an attached air purifier that can be easily attached to a blower such as an automobile dashboard or a circulator.
Therefore, an object of the present invention is to apply such a photocatalyst-supported filter to a mounted air purifier that can be easily attached to a blower.

Thus, according to the present invention, a solid base material provided with a plurality of through holes penetrating in the thickness direction, and a photocatalyst layer formed on the surface of the solid base material including the inside of the through holes. The through hole has a first opening having a hole diameter a provided on the front surface of the solid base material and a second opening having a hole diameter b provided on the back surface of the solid base material. Provided is a photocatalyst-supporting filter characterized in that the pore diameter b is smaller than the pore diameter a (pore diameter a> pore diameter b).
Here, the solid base material preferably has an outer layer containing silicon carbide and an inner layer containing a graphite-like carbon material.
It is preferable that the hole diameter of the through hole is continuously reduced from the hole diameter a on the front surface to the hole diameter b on the back surface.
It is preferable that the hole diameter of the through hole is gradually reduced from the hole diameter a on the front surface to the hole diameter b on the back surface.
The photocatalyst layer preferably contains titanium dioxide (TiO _2).
Further, according to the present invention, it is a mounting type air purifier attached to a blower, and a container main body provided with an air inlet and an air exhaust port and the container main body can be attached to an air outlet of the blower. It has a locking tool and a photocatalyst-supporting filter provided in the air passage from the air inlet to the air exhaust port and having a photocatalyst layer formed on the surface of a solid base material provided with a plurality of through holes. The through holes of the photocatalyst-supporting filter include a first opening having a pore diameter a provided on the front surface of the solid substrate and a second opening having a pore diameter b provided on the back surface of the solid substrate. The attached air purifier is provided, wherein the hole diameter b is smaller than the hole diameter a (hole diameter a> hole diameter b).

According to the present invention, the photocatalyst carried on the solid substrate constituting the photocatalyst-supporting filter is efficiently irradiated with ultraviolet energy, and the photocatalytic action is activated.
Further, according to the present invention, such a photocatalyst-supported filter is applied to a mounted air purifier that can be easily attached to a blower.

It is a figure explaining the 1st Example of the photocatalyst-supporting filter to which this embodiment is applied, FIG. 1A is a schematic perspective view, and FIG. 1B is shown in FIG. 1A. It is a schematic cross-sectional view of XX of a photocatalyst-supported filter. It is schematic cross-sectional view explaining the example of the layer structure of the photocatalyst-supporting filter to which this embodiment is applied. 3 (a) to 3 (d) are schematic cross-sectional views illustrating an example of the cross-sectional shape of the through hole of the photocatalyst-supported filter to which the present embodiment is applied. 4 (a) to 4 (f) are schematic views illustrating an example of a planar shape of a through hole of a photocatalyst-supported filter to which the present embodiment is applied and an arrangement state. It is a figure explaining the 2nd Example of the photocatalyst-supporting filter to which this embodiment is applied, FIG. 5A is a schematic perspective view of the photocatalyst-supporting filter formed in a hollow shape, and FIG. ) Is a schematic perspective view when an ultraviolet lamp is attached to the photocatalyst-supported filter. FIG. 6 (c) is a schematic cross-sectional view taken along the line YY of the photocatalyst-supported filter shown in FIG. 5 (b). FIG. 6B is a schematic perspective view illustrating a third embodiment of the photocatalyst-supported filter to which the present embodiment is applied. It is a schematic diagram which shows an example of the attached type air purifier to which this embodiment is applied. 7 (a) is a perspective view of the mounted air purifier, and FIG. 7 (b) is a front view of the mounted air purifier seen from the direction A of FIG. 7 (a). It is an exploded perspective view of the attached type air purifier to which this embodiment is applied. It is a figure explaining the case where the attached type air purifier to which this embodiment is applied is applied to a blower.

Hereinafter, embodiments of the present invention will be described in detail. The present invention is not limited to the following embodiments, and can be variously modified and implemented within the scope of the gist thereof. That is, unless otherwise specified, the dimensions, materials, shapes, relative arrangements, and the like of the components described in the examples of the embodiments are not intended to limit the scope of the present invention, but are merely explanatory examples. .. In addition, the drawings used are examples for explaining the present embodiment, and do not represent the actual size. The size and positional relationship of the members shown in each drawing may be exaggerated to clarify the explanation. Further, in the present specification, "upper" such as "on the layer" is not necessarily limited to the case where it is formed in contact with the upper surface, but when it is formed separately and upward, or between layers. It is used to include the presence of intervening layers.

(Photocatalyst-supported filter)
1A and 1B are views for explaining a first embodiment of a photocatalyst-supported filter 100 to which the present embodiment is applied, FIG. 1A is a schematic perspective view, and FIG. 1B is FIG. It is a schematic cross-sectional view of XX of the photocatalyst-supporting filter 100 shown in (a).
As shown in FIG. 1A, the photocatalyst-supported filter 100 has a solid base material 10 provided with a plurality of through holes 30 penetrating the front surface 21 and the back surface 22 in the thickness direction, and the inside of the through holes 30. It has a photocatalyst layer 20 formed on the surface 22 of the solid base material 10 containing the mixture.
In the present embodiment, the thickness d of the photocatalyst-supported filter 100 including the solid base material 10 and the photocatalyst layer 20 is usually in the range of 20 mm to 30 mm. The planar shape of the through hole 30 is circular or elliptical. The distance (pitch) La of the two adjacent through holes 30 is usually in the range of 0.5 mm to 10 mm. The distance Lb between the two adjacent through holes 30 is usually in the range of 0.5 mm to 5 mm.

As shown in FIG. 1 (b), in the present embodiment, the photocatalyst layer 20 of the photocatalyst-supported filter 100 is formed on the surface 21 side of the solid base material 10 and the surface of the solid base material including the inside of the through hole 30. It is formed. The photocatalyst layer 20 may be formed on the back surface 22 side of the solid base material 10.
As shown in FIG. 1 (b), the through holes 30 of the photocatalyst-supported filter 100 include a first opening 31 having a hole diameter a provided on the front surface 21 side of the solid base material 10 and a back surface 22 of the solid base material 10. It has a second opening 32 having a hole diameter b provided on the side, and is formed so that the hole diameter b is smaller than the hole diameter a (hole diameter a> hole diameter b). As a result, in the present embodiment, the cross-sectional shape of the solid base material 10 of the through hole 30 in the thickness direction is formed so as to be a tapered shape in which the hole diameter is continuously reduced.
The size of the hole diameter a of the first opening 31 is usually in the range of 0.05 mm to 5 mm. The size of the hole diameter b of the second opening 32 is usually in the range of 0.01 mm to 3 mm.

FIG. 2 is a schematic cross-sectional view illustrating an example of the layer structure of the photocatalyst-supported filter 100 to which the present embodiment is applied. As shown in FIG. 2, the photocatalyst-supporting filter 100 has a solid base material 10 and a photocatalyst layer 20 formed on the surface of the solid base material 10. The solid base material 10 has an outer layer 11 in contact with the photocatalyst layer 20 and an inner layer 12 further inside the outer layer 11. In the present embodiment, the outer layer 11 of the solid base material 10 is made of a material containing silicon carbide. The inner layer 12 of the solid base material 10 is made of a graphite-like carbon material.
_{The thickness d 2} of the photocatalyst layer 20 is usually in the range of 0.1 μm to 1 μm. _{The thickness d 1} of the outer layer 10 of the solid base material 10 is usually in the range of 1 μm to 10 μm.

3 (a) to 3 (d) are schematic cross-sectional views illustrating an example of the cross-sectional shape of the through hole 30 of the photocatalyst-supported filter 100 to which the present embodiment is applied. The photocatalyst layer 20 (see FIG. 1B) is omitted.
In the example of the cross-sectional shape of the through hole 30 shown in FIG. 3A, the hole diameter of the through hole 30 is tapered so as to continuously decrease from the front surface 21 side to the back surface 22 side of the solid base material 10. It is formed. That is, the hole diameter of the through hole 30 continuously decreases from the hole diameter a of the first opening 31 to the hole diameter b of the second opening 32 (hole diameter a> hole diameter b), and the hole diameter b on the back surface 22 side is the hole diameter. A conical through hole 30 is formed so as to be smaller than a.

In the example of the cross-sectional shape of the through hole 30 shown in FIG. 3B, two steps 33 are provided inside the through hole 30 from the front surface 21 side to the back surface 22 side of the solid base material 10, and the hole diameter is large. It is formed to decrease intermittently. That is, the hole diameter of the through hole 30 is formed so as to continuously decrease in a tapered shape up to the portion of the step 33, and further decrease continuously from the portion beyond the step 33.

In the example of the cross-sectional shape of the through hole 30 shown in FIG. 3C, two steps 33 are provided inside the through hole 30 from the front surface 21 side to the back surface 22 side of the solid base material 10. The shape of the through hole 30 is maintained at a constant hole diameter (= hole diameter a) up to the portion of the first step 33. Further, the hole diameter c (hole diameter a> hole diameter c> hole diameter b) smaller than the hole diameter a is maintained from the portion exceeding the first step 33 to the portion of the second step 33. The hole diameter b is formed from the portion beyond the second step 33 to the back surface 22 side.

In the example of the cross-sectional shape of the through hole 30 shown in FIG. 3 (d), a spiral is formed along the inner surface of the through hole 30 formed in a gentle conical shape from the front surface 21 side to the back surface 22 side of the solid base material 10. A shaped groove 34 is provided. The hole diameter of the through hole 30 is formed so that the hole diameter b of the second opening 32 is smaller than the hole diameter a of the first opening 31 (hole diameter a> hole diameter b).

In the present embodiment, the ratio of the hole diameter a of the first opening 31 to the hole diameter b of the second opening 32 (hole diameter b / hole diameter a) is usually in the range of 0.1 to 0.9, which is preferable. Is in the range of 0.2 to 0.8. By forming the shape of the through hole 30 so that the hole diameter b of the second opening 32 is smaller than the hole diameter a of the first opening 31 (hole diameter a> hole diameter b), the photocatalyst-supported filter 100 is penetrated. The photocatalytic action of the photocatalytic layer 20 formed on the surface 21 of the solid base material 10 including the inside of the holes 30 tends to be activated. That is, when the ultraviolet energy is irradiated from the surface 21 side of the photocatalyst-supported filter 100, the ultraviolet energy is efficiently irradiated to the portion formed inside the through hole 30 of the photocatalyst layer 20. As a result, it is considered that the photocatalytic action is activated as compared with the case where the pore diameters on the front surface 21 side and the back surface 22 side are the same.

The shape of the through hole 30 is a conical shape (FIG. 3 (a)), an intermittent taper shape (FIG. 3 (b)), a combination of cylindrical shapes having different hole diameters (FIG. 3 (c)), and a reduced hole diameter. It is not limited to the spiral shape (screw type) (FIG. 3 (d)) as long as it is formed so as to reduce the hole diameter of the through hole 30. Further, a vertical groove may be formed inside the through hole 30 from the front surface 21 side to the back surface 22 side.

4 (a) to 4 (f) are schematic views illustrating a planar shape example and an arrangement state of the through hole 30 of the photocatalyst-supported filter 100 to which the present embodiment is applied. 4 (a) to 4 (f) show the arrangement state of the first opening 31 formed on the surface 21 side of the through hole 30 as a plan view of the photocatalyst-supported filter 100.
In the through hole 30 shown in FIG. 4A, a plurality of first openings 31 formed in a circular shape with the same hole diameter are arranged at equal intervals in the vertical direction and the horizontal direction, and are arranged in a grid pattern as a whole. It is formed.
In the through hole 30 shown in FIG. 4B, a plurality of first openings 31 formed in a circular shape with the same hole diameter are arranged so as to be offset by one in each of the vertical direction and the horizontal direction. There is.
The through hole 30 shown in FIG. 4C has a relationship in which a plurality of first openings 31 formed in the same triangular shape are rotated by 180 degrees with respect to the adjacent through hole 30. They are arranged in the vertical direction and the horizontal direction, respectively.
In the through hole 30 shown in FIG. 4D, a plurality of first openings 31 formed in the same square shape are arranged at equal intervals in the vertical direction and the horizontal direction, and are formed in a grid pattern as a whole. Has been done.
In the through hole 30 shown in FIG. 4 (e), a plurality of first openings 31 formed in the same square shape are arranged so as to be offset by one in each of the vertical direction and the horizontal direction. ..
In the through hole 30 shown in FIG. 4 (f), a plurality of first openings 31 formed in the same hexagonal shape are closely packed by shifting each of the plurality of first openings 31 in the vertical direction and the horizontal direction by one. It is arranged so as to be.

The planar shape of the through hole 30 includes a circle, a triangle, a square, a hexagon as shown in FIG. 4, a quadrangle such as a rectangle and a rhombus; a pentagon, a polygon of a heptagon or more; an ellipse, a star, and the like. ..
The planar shape of the through hole 30 may be different between the first opening 31 on the front surface 21 side and the second opening 32 on the back surface 22 side. Further, as shown in FIG. 4, the size of the planar shape of the plurality of through holes 30 having the same shape may be the same, and the size of the planar shape may be different. Further, through holes 30 having different planar shapes may be mixed.

As shown in FIG. 4, the through holes 30 are regularly and uniformly distributed on the surface 21 of the photocatalyst-supported filter 100, such as in a grid pattern, or may be radial, concentric, or the like. Further, the through holes 30 may be randomly distributed on the surface 21 of the photocatalyst-supported filter 100. Further, for example, the distribution density of the through holes 30 may be non-uniform, for example, the distribution density of the through holes 30 is high in the central portion of the surface 21 of the photocatalyst-supporting filter 100, and the distribution density is lower in the peripheral portion.
The total area of the first openings 31 distributed on the surface 21 (the ratio of the through holes 30 on the surface 21) to the surface area of the surface 21 of the photocatalyst-supported filter 100 is not particularly limited, but in the present embodiment. Is usually prepared in the range of 50% to 95%.

5A and 5B are views for explaining a second embodiment of the photocatalyst-supporting filter to which the present embodiment is applied, and FIG. 5A is a schematic perspective view of the photocatalyst-supporting filter 200 formed in a cylindrical shape. FIG. 5B is a schematic perspective view when the ultraviolet lamp 250 is attached to the photocatalyst-supported filter 200.
The photocatalyst-supported filter 200 shown in FIG. 5A has a cylindrical portion 210 having a hollow portion 211 having a diameter D formed in the central portion. The cylindrical portion 210 corresponds to the solid base material 10 (see FIG. 1). The cylindrical portion 210 is formed with a plurality of through holes 230 penetrating from the inner surface side (hollow portion 211 side) of the cylindrical portion 210 to the outer surface side of the cylindrical portion 210. Note that FIG. 5A shows a part of the through hole 230 formed in the entire cylindrical portion 210. Although not shown, the photocatalyst layer 20 (see FIG. 1) is formed on the inner surface side of the cylindrical portion 210 (the surface of the hollow portion 211) and the inner surface of the through hole 230.
As shown in FIG. 5A, the through hole 230 has a first opening 231 formed on the inner surface side of the cylindrical portion 210 and a second opening 232 formed on the outer surface side of the cylindrical portion 210. The hole diameter b of the second opening 232 is smaller than the hole diameter a of the first opening 231 (hole diameter a> hole diameter b).

In the photocatalyst-supported filter 200 shown in FIG. 5B, an ultraviolet lamp 250 is inserted through a hollow portion 211. The same reference numerals are given to the configurations similar to those in FIG. 5A, and the description thereof will be omitted.
In the case of the photocatalyst-supported filter 200 shown in FIG. 5 (b), the fluid (air, water, etc.) to be purified flows in through the gap between the ultraviolet lamp 250 inserted through the hollow portion 211 and the cylindrical portion 210, and is a through hole. It flows out of the cylindrical portion 210 via 230. Examples of the ultraviolet lamp 250 include a light emitting diode (LED), a hot cathode tube, and a cold cathode tube that can obtain ultraviolet energy having a wavelength of 200 nm to 400 nm.
As the ultraviolet lamp 250, an ultraviolet light guide body in which ultraviolet energy generated by an external light emitting diode (LED) or the like is introduced via an optical fiber or the like can also be used.

FIG. 6A is a schematic cross-sectional view taken along the line YY of the photocatalyst-supported filter 200 shown in FIG. 5B. The same components as those in FIG. 5B are designated by the same reference numerals, and the description thereof will be omitted. Although not shown, the photocatalyst layer 20 (see FIG. 1) is formed on the inner surface side of the cylindrical portion 210 (the surface of the hollow portion 211) and the inner surface of the through hole 230.
As shown in FIG. 6A, the ultraviolet lamp 250 is housed in the hollow portion 211 of the photocatalyst-supported filter 200. Both ends of the ultraviolet lamp 250 are attached to the socket 212.

FIG. 6B is a schematic perspective view illustrating a third embodiment of the photocatalyst-supported filter to which the present embodiment is applied.
The photocatalyst-supported filter 300 shown in FIG. 6B has a main body portion 310 having a hollow portion 311 having a diameter D formed in the central portion. Although not shown, an ultraviolet lamp 250 (see FIG. 5B) is inserted through the hollow portion 311 as in FIG. 5B.
The main body 310 corresponds to the solid base material 10 (see FIG. 1) of the photocatalyst-supported filter 300. The main body 310 is formed so that the cross-sectional shape is quadrangular. The main body 310 is formed with a plurality of through holes 330 penetrating from the inner surface side (hollow portion 311 side) of the main body 310 to the outer surface side of the main body 310.

Note that FIG. 6B shows a part of the through hole 330 formed in the entire main body 310. Although not shown, the photocatalyst layer 20 (see FIG. 1) is formed on the inner surface side of the main body 310 (the surface of the hollow portion 311) and the inner surface of the through hole 230.
As shown in FIG. 6B, the through hole 330 has a first opening 331 formed on the inner surface side of the main body 310 and a second opening 332 formed on the outer surface side of the main body 310. The hole diameter b of the second opening 332 is smaller than the hole diameter a of the first opening 331 (hole diameter a> hole diameter b).
The cross-sectional shape of the body portion 310, equal lengths of two sides _{(M 1, M 2) (} M 1 = M 2) squares, different lengths of the two sides _{(M 1, M 2) (} M 1 = M ₂ ) The shape is not particularly limited as long as it has a rectangular shape.

Next, each layer of the photocatalyst-supported filter 100 to which the present embodiment is applied will be described.
(Solid base material)
In the present embodiment, the inner layer 12 of the solid base material 10 is made of a graphite-like carbon material. The graphite-like carbon material can be produced by a known method such as heat-treating a resin for carbon material. Here, in general, when an organic compound is heated, atoms other than carbon such as oxygen, hydrogen, and nitrogen are separated and carbonized, and when heating is continued, graphitization (graphite) is performed.
In the present embodiment, a resin molded body for a carbon material molded by a known molding method is carbonized at a heat treatment temperature of 900 ° C. to 1450 ° C., and further graphitized by heat treatment at a temperature of about 1500 ° C. to 2000 ° C. Graphite) and a graphite-like carbon material is obtained.

Examples of the resin for carbon materials include phenol resins. The phenol resin is a resinous substance obtained by a condensation reaction between phenols and aldehydes, and examples thereof include a resol type phenol resin using an alkali catalyst and a novolak type phenol resin using an acid catalyst.
As a molding method for obtaining a resin molded product for carbon material, for example, a cold hydrostatic press method in which a resin for carbon material is placed in a rubber container mold and six surfaces are pressed at equal pressure, and a resin for carbon material is placed in an extrusion mold. Examples thereof include an extrusion molding method in which pressure is applied from one side and extruded from a nozzle, and a press molding method in which a resin for carbon material is put into a mold and pressed to form a mold.

In the present embodiment, the outer layer 11 of the solid base material 10 is composed of a material containing silicon carbide (SiC). The method for preparing the outer layer 11 containing silicon carbide (SiC) is not particularly limited, but in the present embodiment, for example, it is prepared as follows.
First, in order to mold the inner layer 12 of the solid base material 10 described above, a resin molded body for carbon material is molded using a phenol resin or the like, and then the surface of the molded resin molded body for carbon material is made of silicon ( Si) Cover with powder. After that, the surface of the resin molded body for carbon material whose surface is coated with silicon (Si) powder is heat-treated to be carbonized, and further heat-treated to be graphitized (graphite), whereby the surface of the inner layer 12 made of a graphite-like carbon material is formed. An outer layer 11 composed of silicon carbide (SiC) is formed on the surface.

The method of coating the surface of the molded resin molded body for carbon material with silicon (Si) powder is not particularly limited. For example, silicon in which silicon (Si) powder is dispersed in a dispersion medium such as methyl alcohol or ethyl alcohol. Examples thereof include a method in which the surface of the (Si) slurry is impregnated and dried. As the silicon (Si) powder, a fine powder having an average particle size of about 1 μm to 10 μm is preferable.

In the present embodiment, the mixing ratio of silicon (Si) of silicon powder used in forming the outer layer 11 composed of silicon carbide (SiC) and carbon (C) of phenol resin or the like is silicon (Si). ) And carbon (C) should be selected so that the atomic ratio is Si / C = 0.05 to 4.

(Photocatalyst layer 20)
In the present embodiment, when the photocatalyst used for the photocatalyst layer 20 is used as a filter, for example, metal oxidation capable of photocatalytic reaction by oxidative decomposition of harmful organic substances and the like contained in a fluid such as air as a purification target. Items are mentioned and are not particularly limited.
Specific examples of the photocatalyst include titanium dioxide (particularly, anatase-type titanium dioxide), rutile-type titanium dioxide, and brookite-type titanium dioxide. Further, zinc oxide, tin oxide, lead oxide, ferric oxide and the like may be contained.

In the present embodiment, the photocatalyst preferably contains 50% by mass or more of anatase-type titanium dioxide. In addition, these compounds may be used by appropriately mixing a plurality of kinds.
As the photocatalyst, various forms such as powder, lump, granular, flat plate, and fibrous can be used. In this embodiment, powdered titanium dioxide having an average particle size of 1 nm to 100 nm is used.

In the present embodiment, the photocatalyst is usually carried on the outer layer 11 of the solid base material 10 by the following procedure. That is, the solid base material 10 composed of the inner layer 12 containing the graphite-like carbon material and the outer layer 11 containing silicon carbide (SiC) is immersed in _{a slurry (TiO 2} slurry) containing a photocatalyst such as _{titanium dioxide (TiO 2).} After drying, it is fired in the air at a temperature of about 100 ° C. to 800 ° C. Water is used as a dispersion medium for the TiO _{2 slurry.}
In this embodiment, the TiO ₂ slurry, for example, addition of titanium dioxide (TiO ₂₎ or the like in an aqueous solution of polyvinyl alcohol, may be adjusted to a predetermined viscosity. Polyvinyl alcohol is also useful as a binder for fixing titanium dioxide (TiO ₂ ) to the surface of the outer layer 11 of the solid base material 10.
The concentration of titanium dioxide (TiO ₂ ) in the TiO ₂ slurry is not particularly limited, but in the present embodiment, when it is carried on the outer layer 11 containing silicon carbide (SiC), titanium (Ti) and carbon (C) are carried. The molar ratio (Ti / C) of is adjusted to be in the range of 0.1 to 2.

As described in detail above, the photocatalyst-supported filter 100 to which the present embodiment is applied has a surface 21 having a plurality of through holes 30 penetrating in the thickness direction of the solid base material 10 having the photocatalyst layer 20. By forming the hole diameter b of the second opening 32 on the back surface 22 side smaller than the hole diameter a of the first opening 31 on the side, the ultraviolet rays emitted from the front surface 21 side of the photocatalyst-supported filter 100 can be emitted. The photocatalyst layer 20 formed inside the through hole 30 is efficiently irradiated. As a result, the photocatalytic action is activated.

(Mounted air purifier)
Next, a mounted air purifier including the photocatalyst-supported filter 100 to which the present embodiment is applied will be described.
FIG. 7 is a schematic view showing an example of the mounted air purifier 400 to which the present embodiment is applied. FIG. 7A is a perspective view of the mounted air purifier 400. As shown in FIG. 7A, the mounted air purifier 400 is a container in which a case A410a provided with an air inlet 411 and a case B410b provided with an air exhaust port 412 (indicated by a dotted line) are combined and integrated. It is composed of a main body 410 and a locking tool 440 provided outside the container main body 410 so that the container main body 410 can be attached to, for example, an air outlet (not shown) of an automobile air conditioner as a form of a blower. Will be done. The mounted air purifier 400 is provided with a photocatalyst-supporting filter and an ultraviolet irradiation means inside (described later).

FIG. 7B is a front view of the mounted air purifier 400 as viewed from the direction A of FIG. 7A. As shown in FIG. 7B, the case B410b constituting the container body 410 is provided with two air exhaust ports 412. Each air exhaust port 412 is formed by arranging seven slit-shaped holes formed elongated in the horizontal direction in the vertical direction.

FIG. 8 is an exploded perspective view of the mounted air purifier 400 to which the present embodiment is applied. As shown in FIG. 8, the mounted air purifier 400 to which the present embodiment is applied includes a case A410a in which an air inlet 411 is formed on an air outlet (not shown) side of an automobile air conditioner or the like. It has a case B410b in which an air exhaust port 412 is formed and integrally with the case A410a to form a container main body 410 (see FIG. 7A). The shape of the air inlet 411 is not particularly limited, but in the present embodiment, a plurality of rectangular holes are formed in the case A410a. Further, as described above, the shape of the air exhaust port 412 is formed by arranging a plurality of slit-shaped holes formed elongated in the horizontal direction in a plurality of stages in the vertical direction (see FIG. 7B).

Inside the container body 410 (see FIG. 7A), a photocatalyst-supporting filter 100 and a photocatalyst-supporting filter 100 provided in the air passage from the air inlet 411 of the case A410a to the air exhaust port 412 of the case B410b An ultraviolet irradiation means 430 for supplying ultraviolet energy is provided. Further, in the present embodiment, flat nylon mesh 421 is provided on the air inlet 411 side surface and the air exhaust port 412 side surface of the photocatalyst-supported filter 100, respectively, to protect the filter surface and to protect large dust. Adhesion is prevented.

The ultraviolet irradiation means 430 includes a substrate 431 having an LED lamp that supplies ultraviolet energy, and a USB terminal 432 that is coupled to an external power source (not shown). In the present embodiment, the ultraviolet irradiation means 430 irradiates the photocatalyst-supported filter 100 with ultraviolet rays having a wavelength of 200 nm to 400 nm from the case B410b side in which the air exhaust port 412 is formed. In this embodiment, NS375L-5RLL (emission wavelength 375 nm to 380 nm, emission output 8.4 mW to 14.0 mW) manufactured by Nitride Semiconductor Co., Ltd. is adopted as the light emitting diode used for the LED lamp. The locking tool 440 is attached to the case A410a in which the air inlet 411 is formed, and the container body 410 (see FIG. 7A) is attached to the air outlet (not shown) of the air conditioner of the automobile.

FIG. 9 is a diagram illustrating a case where the mounted air purifier 100 to which the present embodiment is applied is applied to the blower 600. As shown in FIG. 9, the mounting type air purifier 500 to which the present embodiment is applied includes a container body 510 provided with an air exhaust port 520 and a locking tool 540 that enables the container body 510 to be attached to the blower 600. And have. The air inlet provided on the surface facing the air exhaust port 520, the photocatalyst-supported filter built in the container body 510, and the ultraviolet irradiation means (not shown) are omitted.

The blower 600 has a blower main body 610 provided with an air outlet 611, and attachment portions 640 are provided on both sides of the blower main body 610. By fixing the locking tool 540 of the mounting type air purifier 500 to the mounting portion 640, the mounting type air purifier 500 is mounted on the blower 600.
In the present embodiment, the mounted air purifier 500 is provided with a locking tool movable portion 541 so that the locking tool 540 can move in the A direction corresponding to the width of the blower main body 610 of the blower 600. ing. Although not shown, the mounting type air purifier 500 is attached to the blower 600 by fixing the locking tool 540 of the mounting type air purifier 500 to the mounting portion 640 of the blower 600.

10 ... solid substrate, 11 ... outer layer, 12 ... inner layer, 20 ... photocatalyst layer, 21 ... front surface, 22 ... back surface, 30, 230, 330 ... through holes, 31,231,331 ... first opening, 32, 232,332 ... 2nd opening, 34 ... spiral groove, 210 ... cylindrical part, 211,311 ... hollow part, 250 ... ultraviolet lamp, 310 ... main body part, 100,200,300 ... photocatalyst-supporting filter, 400, 500 ... Mountable air purifier, 410,510 ... Container body, 410a ... Case A, 410b ... Case B, 411 ... Air inlet, 512,520 ... Air exhaust port, 421 ... Nylon mesh, 430 ... Ultraviolet irradiation means, 431 ... Board, 432 ... USB terminal, 440,540 ... Locking tool, 541 ... Locking tool movable part, 600 ... Blower, 610 ... Blower body, 611 ... Air outlet, 640 ... Mounting part

Claims (4)

A solid base material provided with a plurality of through holes penetrating in the thickness direction,
It has a photocatalyst layer formed on the surface of the solid base material including the inside of the through hole, and has.
The total thickness of the solid substrate and the photocatalyst layer is 20 mm to 30 mm.
The solid base material has an outer layer containing silicon carbide in contact with the photocatalyst layer and an inner layer containing a graphite-like carbon material constituting the inside of the outer layer, and the silicon (Si) of the silicon carbide and the graphite. The atomic ratio (Si / C) of carbon (C) of the carbon material is in the range of 0.05 to 4.
The through hole has a first opening having a hole diameter a provided on the surface of the solid base material and a second opening having a hole diameter b provided on the back surface of the solid base material. the pore diameter b is small (open pore size a> pore size b) continuously decreases so that with respect to the ratio between the pore size a and the hole diameter b (hole diameter b / hole diameter a) is 0.1 to 0.9 A photocatalyst-supported filter characterized by being in the range of. The photocatalyst-supporting filter according to claim 1, wherein the pore diameter of the through hole is gradually reduced from the pore diameter a on the front surface to the pore diameter b on the back surface. The photocatalyst layer is a photocatalyst-carrying filter according to claim 1 or 2, wherein the saw including a titanium dioxide (TiO _2), is in the range of thickness of 0.1 to 1 m. A mounted air purifier that can be attached to a blower
A container body with an air inlet and an air exhaust port,
A locking tool that allows the container body to be attached to the blower,
A photocatalyst is provided on the surface of a solid base material provided in the air passage from the air inlet to the air exhaust port and having a plurality of through holes in the thickness direction, and the inside of the through holes. With a layered photocatalyst-supported filter,
The solid base material of the photocatalyst filter has an outer layer containing silicon carbide in contact with the photocatalyst layer and an inner layer containing a graphite-like carbon material constituting the inside of the outer layer, and the silicon carbide (Si) and the silicon carbide. The carbon (C) atomic ratio (Si / C) of the graphite-like carbon material is 0.05 to 4, and the total thickness of the solid substrate and the photocatalyst layer is 20 mm to 30 mm.
The through hole of the photocatalyst-supported filter has a first opening having a pore diameter a provided on the front surface of the solid substrate and a second opening having a pore diameter b provided on the back surface of the solid substrate. and, the hole diameter b is rather small with respect to the hole diameter a (hole diameter a> pore size b) so as to continuously decrease, the ratio between the pore size a and the hole diameter b (hole diameter b / hole diameter a) is 0. A mounted air purifier characterized in the range of 1-0.9.

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