JP2005230759A - Cleaning apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cleaning apparatus capable of securing a large area of a photocatalyst disposed on the front and/or rear surface of a light guiding plate. <P>SOLUTION: This cleaning apparatus is provided with the light guiding plate 12, and a light source 14 disposed along one end face 12a of the light guiding plate 12 and emitting light of a wavelength having a photocatalyst activating action. Transparent plates 22 are disposed on the front and rear surfaces of the light guiding plate 12, and a large number of translucent porous adsorbing materials 24 holding the photocatalyst consisting of anatase-type titanium oxide (TiO<SB>2</SB>), or the like, are fixedly disposed on the surfaces of the transparent plates 22 via a translucent adhesive 26. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a light guide plate in which a photocatalyst is disposed on the front surface side and / or back surface side, and a purification apparatus including a light source that activates the photocatalyst, and in particular, disposed on the front surface side and / or back surface side of the light guide plate. The present invention relates to a purification device capable of ensuring a large surface area of a photocatalyst.

Photocatalysts such as titanium oxide (TiO ₂ ) are activated when irradiated with light such as ultraviolet rays to produce a strong redox effect, and harmful compounds such as nitrogen oxides (NO _X ) and sulfur oxides (SO _X ) A purification device having a light guide plate in which the photocatalyst is disposed on the front side and / or the back side and a light source that activates the photocatalyst has been conventionally used. It is used from.
By the way, decomposition of harmful compounds, pollutants and the like by the photocatalyst is an effect caused by contact of these harmful compounds and pollutants 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.

Therefore, the present applicant previously arranged a large number of fibrous bodies that are provided with a light guide plate and a light source and whose surface is coated with a photocatalyst on the front side and / or the back side of the light guide plate. A purifying device was proposed (Japanese Patent Application No. 2003-82765).
As shown in FIGS. 6 and 7, the purification device 70 includes a light guide plate 72, a light source 74 disposed along one end surface 72 a of the light guide plate 72, and a reflection plate 76 that covers the outer side of the light source 74. It has. In addition, a reflective tape 78 is attached to the end face other than the one end face 72a of the light guide plate 72 where the light source 74 is disposed.
A large number of substantially conical reflective recesses 80 are formed on the front and back surfaces of the light guide plate 72. The reflecting recess 80 reflects light incident from the one end surface 72a of the light guide plate 72 to the front surface side and the back surface side of the light guide plate 72 so that light is uniformly emitted from the entire front surface and back surface of the light guide plate 72. It is provided.

Further, a transparent plate 82 is disposed on the front and back surfaces of the light guide plate 72. As shown in an enlarged view in FIG. 7, a photocatalyst made of titanium oxide (TiO ₂ ) or the like is formed on the surface of the transparent plate 82. A large number of elongated fibrous bodies 86 covered with 84 are attached in an erected state substantially perpendicular to the surface of the transparent plate 82 via an adhesive 88. As a result, a large number of fibrous bodies 86 covered with the photocatalyst 84 are arranged on the front side and the back side of the light guide plate 72. The fibrous body 86 is configured by coating the surface of a fiber 90 such as glass fiber or resin fiber with a photocatalyst 84 (FIGS. 8 and 9).

  When light having a wavelength having a photocatalytic activation effect is emitted from the light source 74, the purification device 70 enters the light guide plate 72 from one end surface 72a of the light guide plate 72, and is then reflected by the reflective recess 80. Then, the light and light are emitted from the front and back surfaces of the light guide plate 72, and further pass through the transparent plate 82 to activate the photocatalyst 84, thereby purifying air and water.

In the purification device 70, a large number of fibrous bodies 86 covered with the photocatalyst 84 are substantially perpendicular to the surface of the transparent plate 82 on the surface of the transparent plate 82 disposed on the front and back surfaces of the light guide plate 72. As a result, the surface area of the front surface side and the back surface side of the light guide plate 72 on which the photocatalyst 84 is disposed increases the surface integral of the many fibrous bodies 86 that are deposited. Thus, the surface area of the photocatalyst 84 disposed on the front surface side and the back surface side of the light guide plate 72 can be dramatically increased.
However, since it is desirable to increase the surface area of the photocatalyst as much as possible in order to improve the ability of the photocatalyst to purify air and water, the surface area of the photocatalyst disposed on the front and / or back side of the light guide plate is further increased. The appearance of a purification device that can be secured has been desired.

  The present invention has been made to meet the above-described demand, and an object of the present invention is to realize a purification device capable of ensuring a large surface area of the photocatalyst disposed on the front surface side and / or the back surface side of the light guide plate. It is in.

  In order to achieve the above object, a purification apparatus according to the present invention includes a light guide plate, and a light source that makes light having a wavelength having a photocatalytic activation action enter the light guide plate from an end surface of the light guide plate. A large number of light-transmitting porous adsorbents are arranged on the front surface side and / or the back surface side, and a photocatalyst is held in the surface and pores of the porous adsorbent material.

  For example, the porous adsorbent is fixed to the surface of a transparent plate disposed on the front surface and / or the back surface of the light guide plate via a translucent adhesive. In addition, the porous adsorbent may be disposed on the front and / or back surface of the light guide plate, and the porous adsorbent may be covered with a net-like member.

  It is desirable to dispose a reflective material together with the porous adsorbent on the front side and / or back side of the light guide plate.

  In the purification apparatus of the present invention, a large number of porous adsorbents having an extremely large specific surface area are arranged on the front surface side and / or the back surface side of the light guide plate, and the photocatalyst is formed on the surface and pores of these porous adsorbent materials. Therefore, it is possible to secure a large surface area of the photocatalyst disposed on the front side and / or the back side of the light guide plate.

  In addition, when a reflective material is arranged on the front surface side and / or back surface side of the light guide plate together with the porous adsorbent, the light that activates the photocatalyst is reflected in various directions to improve the irradiation efficiency to the photocatalyst. Can be made.

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. 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 reflecting plate 16 covering the outer side of the light source 14 are provided.
Further, a reflection tape 18 made of a metal having a high light reflectivity is attached to the end face other than the one end face 12a of the light guide plate 12 on which the light source 14 is disposed.
The light source 14 emits light such as ultraviolet light or visible light having a wavelength having a photocatalytic activation effect, and is not limited to the cold cathode tube, and a light emitting diode (LED) or the like can also be used.

A large number of substantially conical reflective recesses 20 are formed on the front and back surfaces of the light guide plate 12. The reflective recess 20 reflects light incident from the one end surface 12a of the light guide plate 12 to the front surface side and the back surface side of the light guide plate 12 so that light is uniformly emitted from the entire front surface and back surface of the light guide plate 12. It is provided. That is, the light reflected by the reflective recess 20 formed on the surface of the light guide plate 12 is guided to the back side of the light guide plate 12, and the light reflected by the reflective recess 20 formed on the back surface of the light guide plate 12 12 led to the surface side.
When the thickness of the light guide plate 12 is 5 mm, the dimensions of the reflective recess 20 are 0.085 mm to 0.116 mm in depth and the pitch between adjacent reflective recesses 20 is approximately 0.5 mm.
The reflective recess 20 can be formed by performing laser irradiation on the front and back surfaces of the light guide plate 12.

A transparent plate 22 is disposed on the front and back surfaces of the light guide plate 12, and a photocatalyst (not shown) made of anatase-type titanium oxide (TiO ₂ ) or the like is held on the surface of the transparent plate 22. A large number of translucent porous adsorbents 24 are fixedly arranged via a translucent adhesive 26.
As the photocatalyst, other metal oxides having a photocatalytic action such as ZnO, SrTiO ₃ , BaTiO ₃ , Fe ₂ O _{3 and the} like can be used in addition to the above titanium oxide. It is excellent in activity and can be used most preferably.
The photocatalyst can be not only a photocatalyst that is activated by irradiation with ultraviolet rays but also a visible light photocatalyst that is activated by irradiation with visible light.
The translucent adhesive 26 is, for example, an alkali silane bond, an ethyl silicate bond, an alkoxy lane bond, an alkoxy lane bond in which an organic functional group is partially introduced, and an alkoxy lane bond obtained by reacting an organic polymer. An inorganic binder such as a product or a hybrid inorganic binder can be used.

The translucent porous adsorbent 24 is composed of bead-shaped silica gel having a diameter of about 0.1 mm to 5 mm having a large number of pores having a diameter of about 10 nm to 50 nm, and the specific surface area of the pores is 50 m ^2. / G to about 300 m ² / g. The photocatalyst is adsorbed and held not only on the surface of the porous adsorbent 26 but also in the pores.
In order to retain the photocatalyst on the surface and pores of the porous adsorbent 26, for example, the porous adsorbent 26 is immersed in a dispersion of photocatalyst fine particles whose particle diameter is smaller than the pore diameter of the porous adsorbent 26. Then, it can be performed by drying and firing.

  In the first purification device 10, when light (ultraviolet light or visible light) having a photocatalytic activation effect is emitted from the light source 14, the light is transmitted from the one end surface 12 a of the light guide plate 12 to the light guide plate 12. After entering the interior, the light is reflected by the reflective recess 20 and exits from the front and back surfaces of the light guide plate 12, and further passes through the transparent plate 22 and is irradiated to the photocatalyst held by the porous adsorbent 24. As a result, the photocatalyst is activated and air and water can be purified.

The first purification device 10 is formed on the surface of the transparent plate 22 disposed on the front and back surfaces of the light guide plate 12.
Since a large number of porous adsorbents 24 having a very large specific surface area are arranged and the photocatalyst is held in the surface and pores of the porous adsorbents 24, they are arranged on the front and back sides of the light guide plate 12. A large surface area of the photocatalyst can be secured.
As described above, since the porous adsorbent 24 and the adhesive 26 have translucency, the surface of the porous adsorbent 24 and the photocatalyst held in the pores can be sufficiently irradiated with light. It is. Further, since the porous adsorbent 24 having a large number of pores is excellent in air permeability and water permeability, the contact efficiency between the photocatalyst and air or water is good.
Of the light emitted from the light source 14, the light that does not go to the one end surface 12 a side of the light guide plate 12 can be reflected by the reflecting plate 16 and guided to the one end surface 12 a side of the light guide plate 12. The activation efficiency of the photocatalyst 30 is high.
Further, the reflection tape 18 can prevent light from escaping from an end face other than the one end face 12 a of the light guide plate 12.

FIG. 2 shows a modification of the first purification device 10, and the modification of the first purification device 10 is provided on the surface of the transparent plate 22 disposed on the front surface and the back surface of the light guide plate 12. A plurality of bead-like reflectors 28 together with a large number of porous adsorbents 24 are fixedly arranged via a translucent adhesive 26.
The reflector 28 can be made of a material having a high light reflectance such as aluminum. Further, the reflecting material 28 may be formed of a member whose surface is white with high light reflectance.
Thus, by using the reflective material 28 together with the porous adsorbent 24, the light for activating the photocatalyst can be reflected in various directions to improve the irradiation efficiency to the photocatalyst.

FIG. 3 shows a second purification device 30 according to the present invention. The second purification device 30 has a large number of porous adsorbents 24 disposed on the front and back surfaces of the light guide plate 12, and These porous adsorbents 24 are configured to be covered with a mesh member 34 having a large number of communication holes 32. The mesh member 34 can be made of an appropriate material such as metal or resin.
Even in the second purification device 30, a large number of porous adsorbents 24 having a very large specific surface area are disposed on the front and back surfaces of the light guide plate 12, and the surface and pores of these porous adsorbents 24 are arranged. Since the photocatalyst is held, a large surface area of the photocatalyst disposed on the front surface side and the back surface side of the light guide plate 12 can be secured.

FIG. 4 shows a modification of the second purification device 30. In this modification of the second purification device 30, a plurality of bead-like reflectors 28 are disposed on the front and back surfaces of the light guide plate 12 together with a number of porous adsorbents 24, and these porous adsorbents 24 and reflectors are arranged. 28 is configured by covering with a mesh member 34.
Thus, by using the reflective material 28 together with the porous adsorbent 24, the light for activating the photocatalyst can be reflected in various directions to improve the irradiation efficiency to the photocatalyst.

FIG. 5 shows an air purification device 40 configured by using a plurality of the first purification devices 10. The air purification device 40 has an inlet 42 on one side surface, It is configured by housing the two first purifying devices 10 and the fans 48 inside a housing 46 having exhaust ports 44 formed on opposite side surfaces.
The air purification device 40 drives the fan 48 to introduce external air into the housing 46 from the air inlet 42 and contacts the photocatalyst held by the porous adsorbent 24 of the first purification device 10. After being purified, the exhaust is discharged from the exhaust port 44.

  In order to increase the surface area of the photocatalyst, the mesh member 34 may carry the photocatalyst.

In the above description, a case where a large number of porous adsorbents 24 and / or reflectors 28 are arranged on both the front surface side and the back surface side of the light guide plate 12 has been described. The porous adsorbent 24 may be disposed only on one of them.
In the above description, the light source 14 is disposed along the one end surface 12 a of the light guide plate 12. However, the light source 14 may be disposed along a plurality of end surfaces of the light guide plate 12. In short, the light source 14 may be disposed along at least one end surface of the light guide plate 12.

  In the above description, the case where the translucent porous adsorbent 24 is made of silica gel has been described as an example. However, the present invention is not limited to this, and a large number of nm units such as Vycor glass can be used. The porous adsorbent 24 may be composed of porous glass having the pores described above.

When the purification devices 10 and 30 of the present invention are used for purification of gases such as air, the surface of the porous adsorbent 24 is coated with a silicone resin or a tetrafluoroethylene polymer (polytetrafluoroethylene). You may coat | cover with water-repellent gas-permeable resin, such as Teflon (trademark) which is ethylene and PTFE.
As described above, when the surface of the porous adsorbent 24 is coated with a water-repellent gas-permeable resin, the porous adsorbent 24 is suppressed from adsorbing moisture in the air into the pores. The target gas can be efficiently adsorbed in the pores and brought into contact with the photocatalyst in the pores.
In the case of the first purification device 10, a large number of porous adsorbents are used by using a water-repellent gas permeable resin such as the above-mentioned silicon resin or Teflon (registered trademark) as the translucent adhesive 26. 24 may be fixed to the surface of the transparent plate 22 disposed on the front and back surfaces of the light guide plate 12. Also in this case, the water-repellent gas-permeable resin used as the adhesive 26 suppresses the porous adsorbent 24 from adsorbing moisture in the air into the pores, and as a result, the gas to be purified Can be efficiently adsorbed in the pores and brought into contact with the photocatalyst in the pores.

It is a schematic sectional drawing which shows typically the 1st purification apparatus which concerns on this invention. It is a schematic sectional drawing which shows typically the modification of a 1st purification apparatus. It is a front view which shows typically the 2nd purification apparatus which concerns on this invention. It is a front view which shows typically the modification of a 2nd purification apparatus. It is a schematic sectional drawing which shows typically the air purification apparatus formed combining the 1st purification apparatus which concerns on this invention. It is sectional drawing which shows the conventional purification apparatus. It is a schematic sectional drawing which expands and shows the principal part of the conventional purification apparatus. It is an expanded longitudinal cross-sectional view of the fibrous body in the conventional purification apparatus. It is an expansion cross-sectional view of the fibrous body in the conventional purification apparatus.

Explanation of symbols

10 First purification device
12 Light guide plate
14 Light source
24 Porous adsorbent
26 Translucent adhesive
28 Reflector
30 Second purification device
34 Mesh member
40 Air purifier

Claims (4)

  A light guide plate; and a light source that allows light having a wavelength having a photocatalytic activation action to enter the light guide plate from an end surface of the light guide plate, and a light-transmitting porous material on a front surface side and / or a back surface side of the light guide plate A purification device comprising a large number of adsorbents and a photocatalyst held on the surface and pores of the porous adsorbent.   A transparent plate is disposed on the front and / or back surface of the light guide plate, and the porous adsorbent is fixed to the surface of the transparent plate via a translucent adhesive. 1. The purification apparatus according to 1.   The purification apparatus according to claim 1, wherein the porous adsorbent is disposed on the front surface and / or the back surface of the light guide plate, and the porous adsorbent is covered with a net-like member. The purification apparatus according to any one of claims 1 to 3, wherein a reflective material is disposed together with the porous adsorbent on the front side and / or the back side of the light guide plate.

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