JP2005177226A - Method and apparatus for cleaning air using photocatalyst - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To clean the air by irradiating ultraviolet light to titanium dioxide using the property of titanium dioxide to oxidize and decompose organic materials in the air or water through photocatalytic reaction. <P>SOLUTION: A catalytic surface 11 is formed on the the inner wall of a passage 2 for passing contaminated air. A plurality of materials 12, each having a shape for transmitting or reflecting diffusely light flux, such as ultraviolet light or the like, from a light source 6, are provided in the passage 2 in a direction perpendicular to the passage. In a method for cleaning air, the contaminated air is sucked or pressed into the passage by a fan 3 and contacts the catalytic surface 11. An apparatus for cleaning air comprises an intake port 4 for sucking in the contaminated air or taking in the pressurized contaminated air, the passage 2 having an outlet port 9 for discharging cleaned air, the catalytic surface 11 formed on the inner wall of the passage 2, the light source 6 that emits light flux in parallel with respect to the catalytic surface 11, the plurality of materials 12 for transmitting or reflecting diffusely the light flux, a plurality of members 13 for arranging the materials 12 perpendicular to the radiation direction of the light flux, and a reflector plate 10 provided in the passage 2. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention utilizes the fact that when titanium dioxide is irradiated with a light source such as ultraviolet rays, organic substances in the air or water may be oxidatively decomposed by photocatalytic reaction, so that air purification, antifouling (self-cleaning), antifogging ( (Superhydrophilicity), antibacterial, sterilizing, deodorizing and other effects.

  The configuration shown in FIG. 12 is a conventional method in which a surface (contact surface) 11 coated or coated with titanium dioxide is directly irradiated with sunlight or directly with a light source 6 that generates ultraviolet rays or the like with a fluorescent lamp or the like. The contaminant is moved and contacted in parallel along the catalyst surface.

  The configuration shown in FIG. 13 directly irradiates a light source 6 that generates ultraviolet rays or the like with a fluorescent lamp or the like on the inside of a cylindrical shape having a surface (catalyst surface) 11 coated or coated with titanium dioxide or the like in the conventional example. In the method, the contaminants are moved and contacted in parallel along the catalyst surface 11.

FIG. 14 shows a conventional example in which a plurality of materials (catalyst surfaces) 11 coated or coated with titanium dioxide or the like are arranged on both sides, and a light source 6 for generating ultraviolet rays or the like is installed in the middle, directly on both sides. Irradiation method. ,
JP 2002-253664 A

  Titanium dioxide-coated or coated material (catalyst material) is expensive. Except when using sunlight, the catalyst material is irradiated with ultraviolet rays of the wavelength necessary for the photocatalytic reaction at night and in places not exposed to sunlight. If it is going to do, many light sources which generate | occur | produce an ultraviolet-ray will be needed. Naturally, the price is also expensive, and the products manufactured using these materials become expensive. Also, a wider space for the light source is required, and a large amount of power for the light source is also required. Therefore, a structure that efficiently irradiates ultraviolet rays with a small number of light sources and a small amount of power is required for titanium dioxide as a catalyst.

  Light sources that generate ultraviolet rays are expensive, so the number used is reduced, the ultraviolet rays from the light sources are converted into parallel light by an internal mechanism, transmitted to a longer distance, and refracted and reflected to efficiently irradiate the catalyst surface with ultraviolet rays Is to think about.

  According to the present invention, the number of light sources that generate relatively expensive ultraviolet rays is reduced, the ultraviolet rays from the light sources are converted into parallel light, transmitted to a longer distance, and the ultraviolet optical axis is bent and reflected to improve efficiency. In particular, the catalyst surface can be irradiated with ultraviolet rays. .

  In FIG. 1, the pollutant of polluted air sucked from the intake port 4 by the fan 3 into the passage 2 of the main body 1 collects relatively large dust floating in the air by the prefilter 5 and generates a light source 6 that generates ultraviolet rays. The harmful gas and bacteria are separated by the photocatalytic filter 7 whose structure will be described later, deodorized and deodorized by the activated carbon filter 8, and discharged from the discharge outlet 9 by the fan 3. At this time, the light beam from the light source 6 described later is reflected by the reflecting plate 10 disposed behind the photocatalytic filter 7. In some cases, the activated carbon filter 8 may be installed between the pre-filter 5 and the light source 6.

  Although the fan 3 has been described as having a suction action, it can also be configured by press-fitting in practice. Further, the light source 6 for irradiating ultraviolet rays is assumed to be constituted by a fluorescent lamp, a black light, a photochemical lamp, a cold cathode fluorescent lamp, or the like.

  In FIG. 2, the pollutant of polluted air sucked by the fan 3 is arranged in two layers irradiated by the light source 6 that generates relatively large dust floating in the air by the prefilter 5 and generates ultraviolet rays. The harmful gas and bacteria are decomposed by the photocatalytic filter 7, deodorized and deodorized by the activated carbon filter 8, and discharged by the fan 3. In some cases, the activated carbon filter 8 may be installed between the pre-filter 5 and the photocatalytic filter 7.

  FIG. 3 shows the basic structure of the photocatalytic filter 7, which is arranged on the inner wall of the main body 1 made of a punched aluminum plate so that, for example, a catalyst surface 11 coated or coated with titanium dioxide is on the inner side. When titanium dioxide is applied or coated in this way, the antifouling (self-cleaning) effect of titanium dioxide can be expected, but in some cases, it is also considered that the titanium dioxide is not applied or coated. A member 13 that forms a gap allowing passage of the light beam from the light source 6 is disposed in the passage 2, and the member 13 is sandwiched by these members 13 made of a material that is not oxidatively decomposed by a catalyst such as aluminum. On the other hand, a large number of materials 12 having a shape that transmits and diffusely reflects the light beam from the light source 6 in the crossing direction.

  These materials 12 are transparent reflection materials such as glass, acrylic resin, ABS, and vinyl chloride. The cross-sectional shape is a polyhedron, and ultraviolet rays emitted from a light source 6 that generates ultraviolet rays at a position parallel to the catalyst surface 11. Part 14 of the light passes through the vertical surface 15 of the material 12 that is transmitted and diffusely reflected, and reaches the end portion 16. The terminal portion 16 of the ultraviolet rays reached by the portion 14 of the ultraviolet rays is reflected by the reflecting plate 17 and again passes through the middle of the catalyst material. The ultraviolet ray 18 transmitted and reflected through a part 14 of the ultraviolet ray is refracted by the inside 19 of the material 12 that is transmitted and diffusely reflected, irradiates the catalyst surface 11 and is reflected by the catalyst surface 11, and this is repeated.

  Further, a part 20 of the ultraviolet rays irradiated from the light source 6 is diffusely reflected by the outer inclined surface 21 of the material 12 having a shape to transmit and diffusely reflect, and irradiates the catalyst surface 11 and is reflected by the catalyst surface 11. As described above, by reflecting and refracting the ultraviolet optical axis, the ultraviolet rays efficiently irradiate the catalyst surface 11.

  4 is an overhead perspective view of FIG. 3, and FIG. 5 is a photocatalyst layer 22 in which a plurality of photocatalyst filters 7 having the structure of FIG. 3 are laminated to form a photocatalyst layer of FIG. The arrangement method of the light source 6 that generates ultraviolet rays with respect to 22 is common to FIGS.

  In FIG. 6 and FIG. 7, which is a perspective view of FIG. 6, the light source 6 that generates ultraviolet rays is arranged outside the photocatalyst layer 22, and the concave reflecting mirror 23 is installed outside the light source 6 and reflected on the opposite side. By installing the plate 17, the ultraviolet ray efficiently irradiates the catalyst surface 11 by reflecting and refracting the ultraviolet light flux by the action of the material 12 that transmits and diffusely reflects the ultraviolet ray emitted from the light source 6.

  In FIG. 8 and FIG. 9, which is a perspective view of FIG. 8, a light source 6 that generates ultraviolet rays is arranged on both sides of the photocatalyst layer 22, and concave reflectors 23 are installed on both outer sides of the light source 6. The ultraviolet rays efficiently irradiate the catalyst surface 11 by reflecting and refracting the luminous flux of the ultraviolet rays by the action of the material 12 that transmits and diffusely reflects the ultraviolet rays irradiated from 6.

  In FIG. 10 and FIG. 11, which is a perspective view of FIG. 10, a photocatalyst layer 22 is arranged on both sides, a light source 6 that generates ultraviolet rays is arranged in the center, and reflectors 17 are installed on both outer sides of the photocatalyst layer 22 Thus, the catalyst surface 11 is efficiently irradiated by reflecting and refracting the ultraviolet optical axis by the action of the material 12 having a shape that transmits and diffusely reflects the ultraviolet light emitted from the light source 6.

  In the above-described configuration, it is desirable to form a titanium dioxide coating or coating on the surfaces of the light source 6, the material 12, and the member 13 for antifouling (self-cleaning).

It is a block diagram which shows the basic form of this invention. It is a block diagram of the other basic form of this invention. It is a figure which shows the basic structure of a photocatalyst filter. FIG. 4 is a perspective view of FIG. It is the figure which laminated | stacked several photocatalyst filters and made it a photocatalyst layer. It is the figure which has arrange | positioned the light source which generate | occur | produces an ultraviolet-ray on the outer side of a photocatalyst layer, and installed the reflecting plate in the outer side of the concave reflective mirror. FIG. 7 is a perspective view of FIG. It is the figure which has arrange | positioned the light source which generate | occur | produces an ultraviolet-ray in the both sides of a photocatalyst layer, and installed the concave reflective mirror in the both outer sides of the light source. FIG. 9 is an overhead perspective view of FIG. It is the figure which has arrange | positioned the light source which generate | occur | produces an ultraviolet-ray in the center part, has arrange | positioned the photocatalyst layer on both sides, and installed the reflecting plate in the both outer sides of the photocatalyst layer. FIG. 11 is an overhead perspective view of FIG. In a prior art example, it is a figure which shows the condition which directly irradiates sunlight etc. to the coating or coating surface (catalyst surface) of titanium dioxide. In a prior art example, it is a figure which shows the method of irradiating directly the light source which generate | occur | produces an ultraviolet-ray inside the cylindrical shape which apply | coated or coated the coating surface (catalyst surface) inside. In the conventional example, a method is shown in which a plurality of materials (catalyst surfaces) coated or coated with titanium dioxide or the like are disposed on both surfaces, and ultraviolet rays are generated by a fluorescent lamp or the like between them.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Main body 2 Passage 3 Fan 4 Intake 5 Pre filter 6 Light source 7 Photocatalytic filter 8 Activated carbon filter 9 Outlet 10 Reflector 11 Catalytic surface 12 Material (polyhedron, polygon)
13 member 14 part of ultraviolet ray 15 vertical surface 16 end part 17 reflector 18 ultraviolet ray 19 inside (of material 12)
20 Part of UV light 21 Outer slope 22 Photocatalyst layer 23 Reflector (concave)

Claims (9)

  A catalyst surface is formed on the inner wall of the polluted air passage, and a large number of materials that transmit and diffusely reflect the luminous flux of the light source such as ultraviolet rays are provided in the direction intersecting the passage, and the contaminated air is sucked by the fan. Alternatively, a method of cleaning air with a photocatalyst that is press-fitted and brought into contact with the catalyst surface.   2. An air cleaning method using a photocatalyst comprising the method according to claim 1 in a plurality of stages.   An intake port through which contaminated air is sucked or injected, a passage having a purified air discharge port, a catalyst surface formed on the inner side wall surface of the passage, and a light beam is irradiated in a direction parallel to the catalyst surface. A light source, a large number of materials that transmit and diffusely reflect the light beam, a member that is arranged in a direction that crosses the material with respect to the irradiation direction of the light beam, and a reflector that is formed in the passage. An air cleaning device using a photocatalyst.   4. An air cleaning device using a photocatalyst, wherein the catalyst surface according to claim 3 is formed by coating or coating of titanium dioxide in particular.   The light source such as ultraviolet rays according to claim 3 is a fluorescent lamp, a black light, or a photochemical lamp. A photocatalytic air cleaning device composed of a cold cathode fluorescent lamp.   4. An air cleaning device using a photocatalyst, wherein the material in claim 3 is a transflective material such as glass, acrylic resin, ABS, or vinyl chloride, and the cross-sectional shape is a polyhedron or a polygon.   7. An air cleaning device using a photocatalyst, comprising a member that is disposed along the upper and lower surfaces in a crossing direction and in a direction parallel to the light beam with respect to the material according to claim 3 or 6, and that forms a gap that allows passage of the light beam.   8. A photocatalytic air cleaning apparatus, wherein the member according to claim 7 is made of aluminum that is not oxidatively decomposed by a catalyst.   4. An air cleaning device using a photocatalyst, wherein the air cleaning device according to claim 3 is integrally formed in a plurality of stages.

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