JP2004290724A - Cleaning apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To realize a cleaning apparatus by which the surface area of a photocatalyst arranged on the front side and/or the back side of a light guide plate can be enlarged dramatically. <P>SOLUTION: This cleaning apparatus is provided with the light guide plate 12 and a light source 14 arranged along one end face 12a of the plate 12 for emitting the light of the wavelength having a photocatalyst activating action. A transparent plate 22 is arranged on each side of the plate 12. A number of first slender fibrous bodies 26 each of which is coated with the photocatalyst 24 consisting of titanium oxide (TiO<SB>2</SB>) are made to adhere to the surface of the plate 22 while interposing an adhesive 28 between them so that they are erected almost perpendicularly to the surface of the plate 22. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a purification device for purifying air or water using a photocatalyst, and more particularly to a purification device including a light guide plate on which a photocatalyst is disposed on a front side and / or a back side, and a light source for activating the photocatalyst. About.
[0002]
[Prior art]
Photocatalysts such as titanium oxide (TiO ₂ ) are activated when irradiated with light such as ultraviolet rays to produce a strong oxidation-reduction action, and are harmful compounds such as nitrogen oxides (NO _X ) and sulfur oxides (SO _X ). Since it exerts an action of effectively decomposing water and contaminants, air and water can be produced by using such a photocatalyst as disclosed in Japanese Utility Model Application Laid-Open No. 6-85085 and Japanese Patent Application Laid-Open No. 9-203582. A device for purifying wastewater has been conventionally used.
[0003]
FIG. 14 shows an example of a conventional purifying device using a photocatalyst. The purifying device 70 is arranged along a light guide plate 72 made of a translucent material and one end surface 72a of the light guide plate 72. The light guide 74 includes a light source 74 and a reflection plate 76 that covers the outside of the light source 74, and a photocatalyst 78 is formed in a film shape on the front surface and the back surface of the light guide plate 72. The light source 74 includes a cold cathode tube or the like, and emits light such as ultraviolet light for activating the photocatalyst 78.
In this purifying device 70, light such as ultraviolet light emitted from a light source 74 enters the inside of the light guide plate 72 from one end face 72 a of the light guide plate 72, and then exits from the front and back surfaces of the light guide plate 72 to be exposed to the photocatalyst 78. By activating the air, purification of air and water can be performed.
[Patent Document 1]
JP-A-6-85085 [Patent Document 2]
JP-A-9-203582
[Problems to be solved by the invention]
Incidentally, the decomposition of harmful compounds, pollutants, and the like by the photocatalyst is an action caused by the contact of these harmful compounds, pollutants, and the like with the photocatalyst. Therefore, in order to improve the ability of the photocatalyst to purify air and water, it is desirable to increase the surface area of the photocatalyst as much as possible.
However, in the above-described conventional purification device 70, since the photocatalyst 78 is disposed in the form of a film on the front surface and the back surface of the light guide plate 72, the surface area of the photocatalyst 78 is larger than the surface area of the front and back surfaces of the light guide plate 72. Could not be expanded.
[0005]
The present invention has been made in view of the above-mentioned conventional problems, and an object of the present invention is to dramatically increase the surface area of a photocatalyst disposed on the front side and / or the rear side of a light guide plate. It is to realize a purification device.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, a purification device according to the present invention includes a light guide plate, and a light source that emits light having a wavelength having a photocatalytic activating action from an end surface of the light guide plate into the inside of the light guide plate. A large number of fibrous bodies each having a front surface coated with a photocatalyst are arranged in an upright state on the front surface side and / or the back side.
[0007]
In the purification device of the present invention, since a large number of fibrous bodies coated with the photocatalyst are arranged in an upright state on the front side and / or the back side of the light guide plate, the light guide plate on which the photocatalyst is arranged is provided. The surface area on the front side and / or the back side increases the surface integral of a large number of fibrous bodies adhered, and as a result, the surface area of the photocatalyst disposed on the front side and / or the back side of the light guide plate jumps. Can be enlarged
[0008]
The fibrous body whose surface is coated with a photocatalyst can be configured by coating a photocatalyst on the surface of a fiber such as a resin fiber or a glass fiber.
[0009]
Further, the fibrous body whose surface is coated with a photocatalyst forms a sintering layer sintered on the surface of the fiber made of silica glass in a state where anatase-type titanium oxide penetrates into fine pores of the silica glass. Furthermore, the surface of the sintering layer can be constituted by coating a photocatalyst made of anatase type titanium oxide.
In this case, since the photocatalyst and the fiber are bonded via the sintering layer sintered in a state where the anatase-type titanium oxide penetrates into the fine pores of the silica glass, the bonding between the photocatalyst and the fiber is performed. Is very strong, and the photocatalyst does not easily peel off and has excellent durability.
[0010]
Further, the fibrous body whose surface is coated with a photocatalyst may be formed by coating a surface of a fiber such as a resin fiber or a glass fiber with a reflecting material, and further coating the surface of the reflecting material with a photocatalyst. it can.
When the photocatalyst coated on the surface of the fiber is thin, a part of the light irradiated on the photocatalyst passes through the photocatalyst and is absorbed by the fiber. Since the reflector is covered, the light transmitted through the photocatalyst can be reflected and reused for activation of the photocatalyst.
[0011]
Further, another purification device of the present invention includes a light guide plate, and a light source that emits light having a wavelength having a photocatalytic activation action from the end face of the light guide plate into the inside of the light guide plate, and the light guide plate has a surface side and / or Alternatively, a large number of fibrous bodies composed of photocatalytic fibers are arranged in an upright state on the back side.
[0012]
In the other purification device of the present invention as well, the photocatalyst is arranged because a large number of fibrous bodies composed of photocatalyst fibers are arranged upright on the front side and / or the back side of the light guide plate. The surface area on the front side and / or the back side of the light guide plate increases the surface integral of a large number of fibrous bodies adhered, and as a result, the photocatalyst disposed on the front side and / or the back side of the light guide plate The surface area can be dramatically increased.
[0013]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment of a purification device according to the present invention will be described with reference to the drawings.
FIG. 1 shows a first purification device 10 according to the present invention. The first purification device 10 includes a light guide plate 12 made of a translucent material such as acrylic resin, glass, polycarbonate resin, and the like. The light source 14 includes a light source 14 composed of a cold-cathode tube disposed along one end surface 12 a of the light guide plate 12, and a reflector 16 that covers the outside of the light source 14.
Further, a reflection tape 18 made of a metal or the like having a high light reflectance is attached to an end face other than the one end face 12a of the light guide plate 12 on which the light source 14 is arranged.
The light source 14 emits light such as ultraviolet light or visible light having a wavelength having a photocatalyst activating action. The light source 14 is not limited to the cold cathode tube, and a light emitting diode (LED) may be used.
[0014]
On the front and back surfaces of the light guide plate 12, a large number of substantially conical reflection concave portions 20 are formed. The reflection concave portion 20 reflects the light incident from one end surface 12a of the light guide plate 12 toward the front surface and the back surface of the light guide plate 12 to uniformly radiate light from the entire surface and the back surface of the light guide plate 12. It is provided. That is, the light reflected by the reflection concave portion 20 formed on the surface of the light guide plate 12 is guided to the back surface side of the light guide plate 12, and the light reflected by the reflection concave portion 20 formed on the back surface of the light guide plate 12 is reflected by the light guide plate. 12 is guided to the surface side.
When the light guide plate 12 has a thickness of 5 mm, the depth of the reflecting recess 20 is about 0.085 mm to 0.116 mm, and the pitch between adjacent reflecting recesses 20 is about 0.5 mm.
The reflection concave portion 20 can be formed by irradiating a laser on the front and back surfaces of the light guide plate 12.
[0015]
Further, a transparent plate 22 made of a translucent material such as glass or resin is disposed on the front and back surfaces of the light guide plate 12, and as shown in FIG. Then, a large number of elongated first fibrous bodies 26 covered with a photocatalyst 24 made of titanium oxide (TiO ₂ ) or the like stand upright on the surface of the transparent plate 22 through an adhesive 28. It is adhered by. As a result, a large number of first fibrous bodies 26 covered with the photocatalyst 24 are arranged on the front side and the back side of the light guide plate 12.
As the photocatalyst 24, not only a photocatalyst activated by irradiation with ultraviolet light but also a visible light type photocatalyst activated by irradiation with visible light can be used.
[0016]
As shown in FIGS. 3 and 4, the first fibrous body 26 is formed by coating a photocatalyst 24 on the surface of a fiber 30 such as a resin fiber such as nylon, polyester, or acryl, or a glass fiber. Is about 5 to 50 μm and the length is about 200 to 5000 μm. The interval between the adjacent first fibrous bodies 26 is about 5 to 100 μm, and the density is high.
The thickness of the photocatalyst 24 is about 1 to 3 μm. Various methods conventionally used for coating the photocatalyst 24 on the fiber 30 can be used. For example, the fiber 30 such as a resin fiber or a glass fiber is immersed in a photocatalyst dispersion, and then dried and fired. By doing so, it is possible to coat.
[0017]
The attachment of the first fibrous body 26 to the surface of the transparent plate 22 can be performed using an electrostatic flocking method. In this method, the first fibrous body 26 is planted on the surface of the transparent plate 22 on which the adhesive 28 is applied in a state where the first fibrous body 26 is raised using static electricity. That is, by charging the first fibrous body 26 to a negative or positive charge using static electricity, and charging the surface of the transparent plate 22 with a charge opposite to the charge of the first fibrous body 26, Using the electrostatic attraction, the first fibrous body 26 is implanted substantially vertically with the first fibrous body 26 being napped on the surface of the transparent plate 22.
Note that the adhesive 28 is made of a light-transmitting material that transmits light such as ultraviolet light or visible light having a wavelength having a photocatalytic activation action. For example, an alkali silicate bond, an ethyl silicate bond, an alkoxylan bond, An inorganic binder or a hybrid inorganic binder such as an alkoxylan bond obtained by partially reacting an organic polymer and an alkoxylan bond obtained by reacting an organic polymer can be suitably used.
[0018]
In the first purification device 10, when light (ultraviolet light or visible light) having a wavelength having a photocatalytic activation action is radiated from the light source 14, the light is transmitted from one end surface 12 a of the light guide plate 12 to the light guide plate 12. After entering the inside, the light is reflected by the reflection concave portion 20 and exits from the front and back surfaces of the light guide plate 12, and further passes through the transparent plate 22 to activate the photocatalyst 24, thereby purifying air and water. You can do it.
As described above, since the adhesive 28 has a light-transmitting property, light having a wavelength having a photocatalytic activation action is not blocked by the adhesive 28.
In addition, of the light emitted from the light source 14, light that does not go to the one end surface 12 a of the light guide plate 12 can be reflected by the reflection plate 16 and guided to the one end surface 12 a side of the light guide plate 12. The activation efficiency of the photocatalyst 24 is high.
Further, the reflection tape 18 can prevent light from escaping from an end face other than the one end face 12a of the light guide plate 12.
[0019]
Thus, in the first purification device 10, a large number of the first fibrous bodies 26 covered with the photocatalyst 24 are formed on the surface of the transparent plate 22 disposed on the front surface and the back surface of the light guide plate 12. And the surface area of the light guide plate 12 on which the photocatalyst 24 is disposed on the surface side and the back surface side of the light guide plate 12 is substantially perpendicular to the surface of the transparent plate 22. As a result, the surface integral of the light guide plate 12 is increased as compared with the case where the photocatalyst 78 is disposed in a film on the front and back surfaces of the light guide plate 72 as in the conventional purification device 70. In addition, the surface area of the photocatalyst 24 disposed on the back surface side can be dramatically increased.
For example, by appropriately adjusting the number, diameter, and length of the first fibrous bodies 26 to be adhered, and the interval between the first fibrous bodies 26, the surface area of the front and back surfaces of the light guide plate 12 is several thousand times. It is possible to arrange the photocatalyst 24 with the above surface area.
In addition, since each first fibrous body 26 is attached “substantially perpendicular” to the surface of the transparent plate 22, the first fibrous bodies 26 do not intersect and become entangled with each other. As a result, when irradiated with light having a wavelength having a photocatalytic activation action, a shadow portion that is not irradiated with light is hardly generated. Therefore, light is sufficiently irradiated to the photocatalyst 24 of each first fibrous body 26, and the activation efficiency of the photocatalyst 24 is extremely high.
[0020]
FIG. 5 shows an air purifying device 32 configured by using a plurality of first purifying devices 10. The air purifying device 32 has an intake port 34 formed on one side surface and faces the one side surface. The first purifier 10 and the fan 40 are housed in a casing 38 having an exhaust port 36 formed on a side surface to be formed.
The air purification device 32 drives the fan 40 to introduce external air into the housing 38 through the intake port 34, and the air purification device 32 and the photocatalyst 24 on the surface of the first fibrous body 26 of the first purification device 10. After contacting and purifying, the gas is discharged from the exhaust port 36.
[0021]
6 and 7 show a second purification device 42 according to the present invention. The second purification device 42 includes a large number of first fibers directly covered with the photocatalyst 24 on the front surface and the back surface of the light guide plate 12 without using the transparent plate 22 in the first purification device 10. It is characterized in that the body 26 is attached in an upright state substantially perpendicular to the front and back surfaces of the light guide plate 12 via an adhesive 28. Substantially the same as 10.
As shown in FIG. 7, the adhesive 28 and the first fibrous body are formed on the surface of the light guide plate 12 where the reflection recess 20 is formed, in order to prevent the light reflection efficiency of the reflection recess 20 from being lowered. 26 is not attached.
The second purification device 42 applies the adhesive 28 to the front and back surfaces of the light guide plate 12 in a state where the portions where the reflection recesses 20 are formed on the front and back surfaces of the light guide plate 12 are masked, and then applies the electrostatic flocking method. The first fibrous body 26 is manufactured by implanting hairs on the front and back surfaces of the light guide plate 12 to which the adhesive 28 has been applied, and then removing the mask.
[0022]
In the second purification device 42, a large number of first fibrous bodies 26 covered with the photocatalyst 24 are provided on the front surface and the back surface of the light guide plate 12 with respect to the front surface and the back surface of the light guide plate 12. Since the photocatalysts 24 are attached in a substantially vertically standing state, the surface area of the light guide plate 12 on which the photocatalyst 24 is disposed on the front surface side and the back surface side is increased similarly to the first purification device 10 described above. As a result, the surface area of the photocatalyst 24 disposed on the front side and the back side of the light guide plate 12 can be dramatically increased.
[0023]
Since the second purification device 42 directly covers the first fibrous body 26 on the front surface and the back surface of the light guide plate 12, the transparent plate 22 in the first purification device 10 is unnecessary. Thus, the number of parts can be reduced.
On the other hand, since the first purification device 10 has the first fibrous body 26 attached to the surface of the transparent plate 22 disposed on the front surface and the back surface of the light guide plate 12, the second purification device 42 As described above, there is no need to apply the first fibrous body 26 avoiding the locations where the reflection recesses 20 are formed on the front and back surfaces of the light guide plate 12, and the first fibrous body 26 is provided over the entire surface of the transparent plate 22. 26 can be applied. Therefore, the first purification device 10 can arrange more first fibrous bodies 26 on the front surface side and the back surface side of the light guide plate 12 as compared with the second purification device 42.
[0024]
In the above description, the case where the first fibrous body 26 is applied to both the front side and the back side of the light guide plate 12 has been described. One fibrous body 26 may be adhered.
Further, in the above description, the case where the light sources 14 are arranged along one end surface 12a of the light guide plate 12 has been described, but the light sources 14 may be arranged along a plurality of end surfaces of the light guide plate 12, respectively. In short, the light source 14 may be arranged along at least one end surface of the light guide plate 12.
[0025]
In the first purification device 10 and the second purification device 42, instead of the first fibrous body 26, the second fibrous body 44 shown in FIGS. 8 and 9 and the second fibrous body 44 shown in FIGS. The third fibrous body 46 and the fourth fibrous body 48 shown in FIGS. 12 and 13 can also be used.
[0026]
The second fibrous body 44 shown in FIGS. 8 and 9 has a sintering layer 50 sintered on the surface of the fiber 30 made of silica glass in a state where anatase-type titanium oxide has penetrated into fine pores of the silica glass. Are formed, and the surface of the sintering layer 50 is coated with a photocatalyst 24 made of anatase type titanium oxide.
The second fibrous body 44 is used for preparing the fiber 30 made of silica glass, before the sintering of the silica glass fiber material, the silica is converted to a titanium metal alkoxide solution of the photocatalyst 24 material. It can be obtained by heating and sintering at a temperature of 400 to 800 ° C. after the impregnation.
That is, since the silica before sintering has a large number of micropores on its surface, when the silica is impregnated with a titanium metal alkoxide solution, the silica surface is coated with the titanium metal alkoxide solution. Then, the titanium metal alkoxide solution permeates into the fine pores of the silica. When heated at a temperature of 400 to 800 ° C. in this state, the silica sinters to form fibers 30 made of silica glass, and the titanium metal alkoxide solution on the silica surface undergoes a hydrolysis and polymerization reaction to form an anatase type. Is formed. Furthermore, the micropores on the silica surface are sintered to form silica glass, and the titanium metal alkoxide solution permeated into the silica micropores undergoes hydrolysis and polymerization to form anatase-type titanium oxide. As a result, the sintering layer 50 sintered in a state in which the anatase-type titanium oxide has penetrated into the fine pores of the silica glass is formed.
In the second fibrous body 44, the photocatalyst 24 and the fiber 30 are bonded via a sintering layer 50 sintered in a state where anatase-type titanium oxide has penetrated into fine pores of silica glass. Therefore, the bond between the photocatalyst 24 and the fiber 30 becomes very strong, and the photocatalyst 24 does not easily peel off and has excellent durability.
[0027]
The third fibrous body 46 shown in FIGS. 10 and 11 is composed of photocatalytic fibers 52 made of anatase-type titanium oxide (TiO ₂ ).
The photocatalyst fibers 52 can be formed, for example, by the following method. First, a metal alkoxide of titanium, water for hydrolysis of the metal alkoxide of titanium, a solvent such as methanol, and a modifier for the hydrolysis and polymerization reaction of the metal alkoxide of titanium are prepared, and A photocatalyst material is produced.
Next, by heating the photocatalytic material in a solution state at a relatively low temperature of, for example, about 200 ° C., the solvent is evaporated, and the hydrolysis / polymerization reaction of the metal alkoxide of titanium is partially advanced to form a solution. The photocatalyst material in the state is formed into a viscous sol.
Next, after stretching the viscous sol photocatalytic material, it is heated and baked at a temperature of 400 ° C. to 800 ° C. to completely advance the polymerization reaction of the metal alkoxide of titanium, thereby forming a gel-like elongated photocatalytic fiber. By forming and cutting the photocatalytic fiber into a predetermined length, the photocatalytic fiber 52 can be formed.
[0028]
In the fourth fibrous body 48 shown in FIGS. 12 and 13, the surface of the fiber 30 such as a resin fiber or a glass fiber is coated with the reflecting material 54, and the surface of the reflecting material 54 is coated with the photocatalyst 24. It is constituted by.
The reflective material 54 is made of a material having a high light reflectance such as aluminum, and is coated on the surface of the fiber 30 by a method such as vapor deposition.
When the photocatalyst 24 coated on the surface of the fiber 30 is thin, a part of the light applied to the photocatalyst 24 passes through the photocatalyst 24 and is absorbed by the fiber 30. In the fibrous body 48, since the surface of the fiber 30 is covered with the reflecting material 54, the light transmitted through the photocatalyst 24 can be reflected and reused for activating the photocatalyst 24.
[0029]
Although not shown, even when fibers made of a material having a high light reflectivity or white fibers having a high light reflectivity are used and the surface of these fibers is coated with a photocatalyst, the fourth fibrous An effect equivalent to that of the body 48 can be obtained.
[0030]
As the photocatalyst, other metal oxides having a photocatalytic action such as ZnO, SrTiO ₃ , BaTiO ₃ , and Fe ₂ O ₃ can be used in addition to the above-mentioned titanium oxide. And can be used most preferably.
[0031]
【The invention's effect】
In the purification device of the present invention, since a large number of fibrous bodies coated with the photocatalyst are arranged in an upright state on the front side and / or the back side of the light guide plate, the light guide plate on which the photocatalyst is arranged is arranged. The surface area on the front side and / or the back side increases the surface integral of a large number of fibrous bodies adhered, and as a result, the surface area of the photocatalyst disposed on the front side and / or the back side of the light guide plate jumps. Can be enlarged
[0032]
In the other purification device of the present invention, the photocatalyst is arranged because a large number of fibrous bodies composed of photocatalyst fibers are arranged in an upright state on the front side and / or the back side of the light guide plate. The surface area on the front side and / or the back side of the light guide plate increases the surface integral of a large number of fibrous bodies adhered, and as a result, the photocatalyst disposed on the front side and / or the back side of the light guide plate The surface area can be dramatically increased.
[Brief description of the drawings]
FIG. 1 is a schematic sectional view showing a first purification device according to the present invention.
FIG. 2 is an enlarged schematic sectional view showing a main part of a first purification device according to the present invention.
FIG. 3 is an enlarged vertical sectional view of a first fibrous body.
FIG. 4 is an enlarged cross-sectional view of the first fibrous body.
FIG. 5 is a schematic sectional view showing an air purification device formed by combining a plurality of first purification devices.
FIG. 6 is a schematic sectional view showing a second purification device according to the present invention.
FIG. 7 is an enlarged schematic cross-sectional view showing a main part of a second purification device according to the present invention.
FIG. 8 is an enlarged longitudinal sectional view of a second fibrous body.
FIG. 9 is an enlarged cross-sectional view of a second fibrous body.
FIG. 10 is an enlarged longitudinal sectional view of a third fibrous body.
FIG. 11 is an enlarged cross-sectional view of a third fibrous body.
FIG. 12 is an enlarged longitudinal sectional view of a fourth fibrous body.
FIG. 13 is an enlarged cross-sectional view of a fourth fibrous body.
FIG. 14 is a sectional view showing a conventional purification device.
[Explanation of symbols]
Reference Signs List 10 First purification device 12 Light guide plate 14 Light source 22 Transparent plate 24 Photocatalyst 26 First fibrous body 28 Adhesive 42 Second purification device 44 Second fibrous body 46 Third fibrous body 48 Fourth Fibrous body

Claims (5)

A light guide plate, and a light source that emits light having a wavelength having a photocatalytic activation action from the end surface of the light guide plate into the inside of the light guide plate, and the front surface and / or the back surface of the light guide plate is coated with a photocatalyst. A plurality of fibrous bodies arranged in an upright state. The discharge tube with a photocatalyst according to claim 1, wherein the fibrous body is formed by coating a surface of a fiber such as a resin fiber or a glass fiber with a photocatalyst. The fibrous body forms a sintering layer sintered on the surface of the fiber made of silica glass in a state where anatase-type titanium oxide penetrates into the fine pores of the silica glass, and further, a surface of the sintering layer. 2. The discharge tube with a photocatalyst according to claim 1, further comprising a photocatalyst made of anatase type titanium oxide. 2. The fibrous body according to claim 1, wherein the surface of a fiber such as a resin fiber or a glass fiber is coated with a reflecting material, and the surface of the reflecting material is coated with a photocatalyst. The discharge tube with a photocatalyst according to the above. A light guide plate, and a light source that emits light having a wavelength having a photocatalytic activation action from the end surface of the light guide plate into the inside of the light guide plate, and the light guide plate is formed of photocatalyst fibers on the front side and / or the back side. A purifying device comprising a large number of fibrous bodies arranged in an upright state.

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