JP2001155690A - Photocatalytic mechanism, photocatalytic deodorizer, and device with photocatalytic deodorizing function - Google Patents

Abstract

(57) [Summary] (with correction) [PROBLEMS] To efficiently perform the action of a photocatalyst and improve the deodorizing and antifouling treatment capacity. A rare gas fluorescent lamp has a pair of external electrodes adhered to an outer surface of a glass bulb, a phosphor layer is applied to an inner surface of the glass bulb so as to form an aperture, and xenon gas is sealed as a discharge medium. Have been. The case 20 is mainly made of an aluminum plate.
Reference numeral 0 denotes an axial fan. Photocatalyst 40
Are disposed to face each other along the longitudinal direction of the aperture of the rare gas fluorescent lamp. The photocatalyst film 42 is formed by applying fine particles mainly composed of TiO ₂ over almost the entire surface of the support 41. Is formed. Since the ratio of ultraviolet light in the wavelength band of 300 to 400 nm emitted by the rare gas fluorescent lamp is large, efficient deodorization and antifouling can be performed, and the influence on the human body and peripheral objects is extremely small, and the discharge Start-up can be quicker.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a photocatalytic mechanism using a rare gas fluorescent lamp, a photocatalytic deodorizer, and an apparatus with a photocatalytic deodorizing function.

2. Description of the Related Art An apparatus utilizing a photocatalytic action is known, for example, from Japanese Patent Publication No. 6-44976 (prior art 1). This device is a deodorizing device and mainly includes a discharge lamp that emits ultraviolet light and a photocatalyst. The photocatalyst is, for example, a film formed of titanium oxide or the like on a substrate, and when irradiated with ultraviolet rays emitted from a discharge lamp, the photocatalyst is activated to generate oxidative decomposition power and adhere to the photocatalyst. Decompose organic substances such as odors such as nitrogen compounds and sulfur compounds. As a discharge lamp that emits ultraviolet rays, a discharge lamp filled with mercury, such as a germicidal lamp or a mercury lamp, is used. This discharge lamp has a wavelength of 254 nm or 365 mainly emitted by mercury.
nm ultraviolet light is used.

[0002] The luminous efficiency of such a discharge lamp depends on the mercury vapor pressure, which varies with the ambient temperature. When the ambient temperature becomes low, the mercury vapor pressure also decreases, so that the luminous flux decreases and the luminous flux rises slowly. Therefore, in a refrigerator or low temperature conditions in winter,
There was a problem that a sufficient deodorizing effect could not be obtained.

As a prior art for solving this problem, the present applicant has proposed Japanese Patent Application Laid-Open No. 9-129184 (prior art 2). This prior art 2 is a photocatalyst device in which xenon is mainly used as a discharge medium, a rare gas fluorescent lamp that emits ultraviolet rays in a wavelength band of 300 to 400 nm is used as a light source, and a photocatalyst is arranged to face the light source. Things.

The rare gas fluorescent lamp used in the photocatalyst device of the prior art 2 first emits 147 nm wavelength light by discharging xenon gas, which is the main discharge medium of the rare gas fluorescent lamp.
And ultraviolet light having a peak wavelength at 172 nm is emitted. The emitted ultraviolet light excites the phosphor provided in the rare gas fluorescent lamp, and the ultraviolet light in the wavelength band of 300 to 400 nm, at which the oxidative decomposition power of the photocatalyst is obtained most effectively, is emitted from the phosphor layer. Is to be done.

However, the prior art 2 uses a pair of internal electrodes as a discharge means for generating a discharge of a rare gas discharge fluorescent lamp, and has a wavelength of 147n.
A positive column that emits ultraviolet light having a peak wavelength at m and 172 nm contracts and discharges. When the positive column is shrunk, ultraviolet rays are self-absorbed by non-ionized xenon or the like before reaching the phosphor layer, so that the intensity of ultraviolet rays emitted to the phosphor layer is reduced. For this reason, the amount of ultraviolet light in the wavelength band of 300 to 400 nm, which is excited and emits the phosphor layer, is also reduced, and the oxidative decomposition power of the photocatalyst may not be sufficiently utilized.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and a rare gas fluorescent lamp capable of more efficiently performing the action of the photocatalyst and improving the processing capability such as deodorization and antifouling. It is an object of the present invention to provide a photocatalyst mechanism, a photocatalyst deodorizer, and a photocatalyst deodorizing function device used.

According to a first aspect of the present invention, there is provided a photocatalytic mechanism having a light-transmitting airtight container having a light-transmitting property, and a rare gas containing mainly xenon sealed in the light-transmitting airtight container. A discharge medium containing a gas, an external electrode provided outside the light-transmitting container, and at least 300-
A rare gas fluorescent lamp provided with a phosphor layer that emits ultraviolet light in a wavelength band of 400 nm or less; and a rare gas fluorescent lamp disposed to face the rare gas fluorescent lamp so as to be irradiated with light from the rare gas fluorescent lamp. And a photocatalyst.

In the present invention and the following inventions, definitions and technical meanings of terms are as follows unless otherwise specified.

The translucent discharge vessel is made of soda lime glass,
It is desirable to use a soft glass such as lead glass, but if necessary, a hard glass such as borosilicate glass,
Semi-hard glass or quartz glass may be used, and materials other than glass, for example, translucent ceramics may be used. In short, any material that has translucency and airtightness, has a permittivity that allows discharge, and satisfies heat resistance and workability at the operating temperature of the rare gas discharge lamp is acceptable. Preferably, a kind of general soda lime glass or borosilicate glass, which does not transmit ultraviolet light having a wavelength of less than 300 nm, is used as the material of the container, and such a glass may affect the human body and surrounding objects. UV rays that have a large effect are not transmitted.

[0008] The cross-sectional shape of the translucent discharge vessel orthogonal to the longitudinal direction is not particularly limited. In general, a circular cross-section is used, but an ellipse or a square may be used if necessary. The tube diameter is not particularly limited as long as it can be used for the photocatalytic mechanism of the present invention.

Furthermore, the light-transmitting container can be set to any length required by the photocatalyst device of the present invention.

The discharge medium is mainly composed of a rare gas containing xenon, and xenon functions to generate ultraviolet rays having wavelengths of 147 nm and 172 nm generated by the low-pressure gas discharge. If necessary, krypton, neon, argon, etc. may be mixed and sealed in addition to xenon as a rare gas to reduce the firing voltage due to the Penning effect. Can be suppressed from flickering.

[0011] The rare gas charging pressure is not particularly limited.

The external electrodes are disposed on the outer surface of the light-transmitting discharge vessel such that a pair of the external electrodes are opposed to each other along the longitudinal direction of the light-transmitting discharge vessel. Therefore, a pair of gaps where no external electrodes are provided are formed around the translucent discharge vessel. These gaps function to ensure insulation between the pair of external electrodes, and can be used as at least a part of the ultraviolet radiation portion.

The external electrode may be formed by attaching a thin plate of a conductive metal such as aluminum to the outer surface of the light-transmitting discharge vessel with an adhesive, or by applying a conductive paste, drying and firing. . Further, a conductive metal may be directly formed by deposition or the like, or may be formed by a transparent conductive film or the like. Furthermore, the conductive metal thin plate or the like may be provided in a flat plate shape or may be provided so as to form a mesh shape such as a mesh shape. The “mesh shape” refers to a structure that partially transmits visible light, such as a braided structure such as metal steel or a punched structure in which porous pores are formed.

As described above, the phosphor layer has a wavelength of 147 nm and a wavelength of 147 nm generated by the low-pressure gas discharge of xenon.
At least 300-
Any function may be used as long as it functions to exchange with ultraviolet light having a different wavelength within the wavelength band of 400 nm, and visible light may be mostly or partially contained in light emission. Therefore,
Known phosphors can be used alone or as a mixture,
It is disposed directly or indirectly on the inner surface of the translucent discharge vessel.

The indirect means, for example, a reflective film mainly composed of particles of a metal oxide having a high visible light reflectance such as titanium oxide or alumina having an average particle diameter of 50 to 100 nm on the inner surface of a translucent discharge vessel, and / or The method includes forming a protective layer of a metal oxide layer containing alumina fine particles as a main component, and disposing a phosphor layer on the inner surface side.

Further, a non-fluorescent substance such as a binder and electron-emitting particles can be mixed in the fluorescent layer in addition to the fluorescent substance.

The position where the phosphor layer of the translucent discharge vessel of the phosphor layer is disposed will be described. That is, the phosphor layer
It is also permissible to dispose it on at least the entire inner peripheral surface of the region surrounding the discharge space of the translucent discharge vessel, or to dispose a phosphor layer in a part of the discharge space. In addition, a reflective type in which a reflective film made of metal oxide particles is formed on the inner surface of the translucent discharge container is also allowed.

The photocatalyst has a photocatalyst film formed on the surface of the substrate from which the light of the rare gas fluorescent lamp is emitted.
It is a semiconductor made of a metal oxide or the like having a photocatalytic action by absorbing ultraviolet rays in a wavelength band of up to 400 nm, and is not particularly limited as long as it has translucency. In short, when the photocatalyst receives the ultraviolet radiation of the rare gas fluorescent lamp and absorbs its light energy, electrons and holes are generated in the photocatalytic semiconductor that constitutes the photocatalytic film, and the electrons and holes are transferred to the photocatalyst. It is sufficient if it reacts with certain oxygen or water to generate active oxygen or other active radicals, and can redox organic dirt and odor components.

The photocatalyst may have any shape such as a plate, a sphere, a shape having a honeycomb structure, or a granular shape. Alternatively, an undercoat layer made of silicon oxide, aluminum oxide, or the like may be formed on the surface of the base, and a photocatalytic film may be formed on the undercoat layer.

The photocatalyst may be constituted by supporting a metal oxide such as titanium oxide having a photocatalytic action on a substrate made of glass beads, glass wool, activated carbon powder, copper powder, alumina particles or the like. The average diameter of the glass beads and alumina particles is several mm to several μm.

The substrate of the photocatalyst is made of aluminum,
It is formed of metal such as iron, glass, ceramics, resin, and the like.

The photocatalyst film is formed by forming a metal oxide sol solution by a dipping method, drying and firing to form a film, or by forming metal oxide fine particles by an ultrafine particle dispersion liquid coating method.
It can be obtained by a method of forming a film by dispersing, coating and drying.

In the photocatalytic mechanism according to the first aspect, when the rare gas fluorescent lamp is first turned on, ultraviolet rays with wavelengths of 147 nm and 172 nm are generated by xenon gas discharge in the rare gas. When the external electrode discharges through the phosphor layer, the positive column strongly excites the phosphor layer near the external electrode, thereby significantly increasing the amount of light emitted. When the positive column diffuses throughout the external electrode, self-absorption of ultraviolet rays is reduced. Since the amount decreases, the amount of ultraviolet light that contributes to the excitation of the phosphor layer increases, and ultraviolet light having an emission peak in a wavelength band of 300 to 400 nm emitted from the phosphor layer is easily emitted from the phosphor layer. Further, this ultraviolet light is transmitted to the photocatalyst outside the rare gas fluorescent lamp through the container and excites the photocatalysis of the photocatalyst. Therefore, the ultraviolet ray emitted from the rare gas fluorescent lamp has a large ratio of the ultraviolet ray in the wavelength band of 300 to 400 nm, so that efficient deodorization and antifouling can be performed. In addition, most UV wavelengths are 300
When the thickness is 400 nm, the influence on the human body and surrounding objects is extremely small. In addition, in the rare gas fluorescent lamp of the present invention, the main component of the discharge medium is composed of xenon, and since xenon has a small pressure change even at a low temperature, the amount of ultraviolet light generated by the discharge is also small, and the discharge rises quickly. can do.

According to a second aspect of the present invention, in the photocatalytic mechanism according to the first aspect, the rare gas fluorescent lamp has an outer diameter of 3 to 10.
It is characterized by a 20 mm tubular shape.

The discharge of the rare gas fluorescent lamp is such that discharge between external electrodes occurs in a direction perpendicular to the longitudinal direction of the translucent container. Therefore, if the tube diameter is too large, the discharge path becomes longer, so that the discharge sustaining voltage increases and the lamp efficiency decreases. On the other hand, if the tube diameter is too small, a sufficient lamp efficiency for exciting the photocatalysis cannot be obtained.

In the photocatalytic mechanism according to the second aspect of the present invention, since the rare gas fluorescent lamp has an appropriate outer diameter, the photocatalytic action can be more efficiently excited. 	

[0027] The photocatalytic mechanism of claim 3 is based on claim 1 or 2
In the photocatalytic mechanism described, the phosphor layer has a general formula YP
O ₄ : Ce, Ce (Mg, Ba) Al ₁₁ O ₁₉ , BaSi
O ₅ : Pb, LaPO ₄ : Ce and (Ce, Ba) M
It is characterized by comprising at least one of the phosphors represented by gAl ₁₁ O ₁₉ .

The phosphor emits light by xenon gas discharge.
UV light of 147 nm and 174 nm was excited.
To a wavelength within the range of 300 to 400 nm as much as possible.
It is desirable to have a YPO₄: C
e, Ce (Mg, Ba) Al ₁₁O₁₉, BaSiO₅: P
b, and (Ce, Ba) MgAl₁₁O₁₉Phosphor
With the use of a peak within the wavelength band of 300 to 400 nm
It becomes easy to obtain the ultraviolet light having.

The phosphor has a wavelength of 350 to 400 nm depending on the thickness of the phosphor layer formed by coating or the like.
The transmittance in the vicinity changes significantly. Therefore, it is desirable to use a phosphor whose emission peak of the excitation light is as low as possible in the wavelength band of 300 to 400 nm.

The photocatalyst mechanism according to the third aspect of the present invention provides a photocatalyst mechanism in which a phosphor of a phosphor layer formed by coating or the like has at least YP.
O ₄ : Ce, Ce (Mg, Ba) Al ₁₁ O ₁₉ , BaSi
O ₅ : Pb, LaPO ₄ : Ce and (Ce, Ba) M
By containing one of gAl ₁₁ O ₁₉ ,
300 to obtain the most efficient oxidative decomposition power of the photocatalyst
Ultraviolet rays in a wavelength band of 400 nm can be more easily obtained, and deodorization and antifouling can be performed more efficiently.

According to a fourth aspect of the present invention, in the photocatalytic mechanism according to any one of the first to third aspects, the phosphor layer comprises:
It is characterized in that it is formed in an aperture shape.

It is desirable that the phosphor layer is formed in an aperture shape in which the phosphor layer is disposed in other portions except for the ultraviolet radiation portion. In addition, a reflection type in which a reflection film made of metal oxide particles is formed on the inner surface of the translucent discharge container except for the ultraviolet radiation portion, and the phosphor layer is formed over the entire circumference including the ultraviolet radiation portion. Tolerating.

In order to form the phosphor layer in the form of an aperture, the phosphor layer is formed on the entire inner surface of the light-transmitting discharge vessel, and then the phosphor layer in the ultraviolet radiating portion is cut off using a scraper. Then, the phosphor layer may be formed by removing the ultraviolet ray emitting portion from the beginning by partial coating. In addition, the same process can be performed when a reflective film is formed, and can be removed simultaneously with the phosphor layer.

According to the photocatalyst mechanism of the fourth aspect of the present invention, the phosphor layer is formed in the form of an aperture, and the region where the ultraviolet light excited by the phosphor layer is radiated intensively is provided, so that the photocatalyst is radiated. UV intensity can be increased.

According to a fifth aspect of the present invention, there is provided the photocatalyst mechanism according to the fourth aspect, wherein the photocatalysts are disposed to face each other along the longitudinal direction of the aperture portion.

In the photocatalyst mechanism according to the fifth aspect of the present invention, since the photocatalysts are disposed so as to face each other along the longitudinal direction of the aperture portion, ultraviolet rays can be more radiated from the rare gas fluorescent lamp to the photocatalysts.

The photocatalyst mechanism according to claim 6 is the photocatalyst mechanism according to any one of claims 1 to 5, wherein the photocatalyst comprises:
It is characterized in that it is arranged near the rare gas fluorescent lamp.

In the photocatalyst mechanism according to the sixth aspect of the present invention, the photocatalyst is disposed near the rare gas fluorescent lamp, so that the rare gas fluorescent lamp can more efficiently emit ultraviolet rays to the photocatalyst.

According to a seventh aspect of the present invention, in the photocatalytic mechanism according to any one of the first to sixth aspects, the discharge medium comprises:
It is characterized in that it contains mercury and the phosphor layer contains a phosphor that emits light when excited by ultraviolet rays emitted by mercury.

A predetermined amount of mercury is sealed in a container together with a rare gas of a predetermined pressure.

A well-known phosphor excited by ultraviolet rays having a 254 nm emission line emitted by mercury may be mixed in the phosphor layer or formed in two layers.

The fluorescent lamp emits ultraviolet rays mainly at the time of low temperature by discharging rare gas, and emits ultraviolet rays mainly at the time of normal temperature by discharging mercury.

Further, since ultraviolet rays having a bright line of 365 nm emitted by mercury are emitted, the ultraviolet rays can be used for photocatalysis.

According to the photocatalytic mechanism of the present invention, since the discharge medium contains mercury, the lamp efficiency of the rare gas fluorescent lamp can be improved.

The photocatalytic mechanism according to claim 8 is the photocatalytic mechanism according to any one of claims 1 to 7, wherein the phosphor layer comprises:
It is characterized by containing a phosphor that emits visible light when excited by ultraviolet light emitted by a rare gas.

In the present invention, the phosphor layer comprises a phosphor which emits visible light when excited by ultraviolet rays of 147 nm and 172 nm emitted by xenon;
It is formed by mixing or splitting two layers with a phosphor that emits ultraviolet light in a wavelength band of 400 nm. As this phosphor, for example, the general formula Y ₃ (Al, Ga) ₅ O ₁₈ , Y
₂ SiO ₅ : Ce, BaAl ₁₂ O ₁₉ : Mn, Y ₃ Al
A phosphor represented by ₅ O ₁₂ : Ce is applicable, but is not limited thereto. Further, the phosphor layer may be composed of one kind of phosphor that emits visible light and ultraviolet light when excited by ultraviolet light emitted by the rare gas.

The photocatalytic mechanism according to the invention of claim 8 can have color rendering properties by exciting the phosphor layer to emit visible light.

A photocatalyst deodorizer according to a ninth aspect of the present invention is a photocatalyst deodorizer comprising: a housing having an air passage communicating between an inlet and an outlet; and a photocatalyst made of TiO ₂ and ZnO. The photocatalyst mechanism according to any one of claims 1 to 8, wherein the photocatalyst mechanism includes at least one of the oxides represented by: and a blowing means for forcibly passing outside air into the ventilation path;
It is characterized by having.

The housing may have a suction port formed at one end and a discharge port formed at the other end, and may have a box shape or a cylindrical shape. . The material may be plastic or metal, and is not particularly limited.

The photocatalyst may contain at least one of TiO ₂ and ZnO, but may be composed of a mixture of these. These TiO ₂ and Zn
O has a strong oxidizing power when irradiated with short-wavelength light of 400 nm or less and can remove gas impurities in the air. However, it is preferable to use TiO _{2 in the} following points. Ti
O ₂ can exert sufficient functions even with weak ultraviolet rays and can remove a wide range of odorous substances, such as ammonia, acetaldehyde, acetic acid, trimethylamine, methyl mercaptan, hydrogen sulfide, styrene, methyl sulfide, dimethyl disulfide and isovaleric acid. Yes, cosmetics and if TiO _2,
It is chemically stable and highly safe, as it is used in toothpaste. If the photocatalyst contains at least one of TiO ₂ and ZnO, a composite material to which an adsorbent such as zeolite or activated carbon is added can be used.

The position of the blower is not particularly limited as long as the blower is disposed in a housing having an inlet and an outlet.
It is only necessary to have a blowing function for forcibly sucking in outside air and discharging it from the outlet. It is desirable to use a fan as the blowing means. At this time, the fan may be either an axial fan or a lateral fan.

Further, the photocatalyst deodorizer of the present invention is allowed to include means for operating as a photocatalyst deodorizer such as a lighting device for lighting a rare gas fluorescent lamp and an operating device for operating a blowing means. According to the photocatalyst deodorizer of the ninth aspect, first, the outside air sucked from the suction port is forcibly ventilated by the ventilation means disposed in the ventilation path in the housing, and the ventilation path in the housing is ventilated. Then, the outside air ventilated through the ventilation path in the housing and deodorized by the photocatalytic mechanism is discharged from an outlet provided in the ventilation path of the housing. Therefore, a photocatalytic deodorizer having the functions of claims 1 to 8 can be obtained.

[0053] Photocatalytic deodorizing function equipped apparatus according to claim 10, the apparatus main body and; disposed in the apparatus body, photocatalyst, TiO ₂
And a photocatalyst mechanism according to any one of claims 1 to 8, comprising at least one of oxides represented by ZnO and ZnO.

The photocatalyst deodorizing device is not particularly limited as long as it has the photocatalyst mechanism according to any one of claims 1 to 8. For example, it includes refrigerators, in-vehicles, air conditioners, lighting equipment, and the like, and is not included in the general concept of a device. However, the present invention also includes buildings such as a freezing warehouse and a refrigerated warehouse.

For example, when used in a refrigerator or the like, a photocatalyst mechanism may be provided integrally in the refrigerator body, or a photocatalyst mechanism formed separately may be provided in a refrigerator or the like in the refrigerator. Including.

According to the photocatalyst deodorizing device of the tenth aspect, a device having the functions of the first to eighth aspects can be obtained.

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic sectional view of a photocatalytic deodorizer according to one embodiment of the present invention. FIG. 2 is a schematic enlarged cross-sectional view of a main part of the photocatalytic mechanism, which is a main part of FIG.

10 is a rare gas fluorescent lamp, 20 is a case as a housing, 30 is a blower fan as blower, 40
Is a photocatalyst.

The rare gas fluorescent lamp 10 is formed in a straight tube shape, and has a pair of external electrodes 12 made of a thin aluminum plate on the outer surface of a glass bulb 11 which is a translucent discharge vessel having an outer diameter I of 8 mm and a total length L of 200 mm. Is sticky. Also,
The phosphor layer 13 has an aperture 1 on the inner surface of the glass bulb 11.
5 and xenon gas is sealed as a discharge medium.

The rare gas fluorescent lamp 10 is disposed in a case 20. Both ends of the rare gas fluorescent lamp 10 are connected to a socket 25 in the case 20. Xenon gas is sealed at about 12 kPa.

The pair of external electrodes 12 are arranged by bonding the aperture 12 through the adhesive layer 14 with the aperture 15 interposed therebetween. Further, the pair of external electrodes 12 are spaced apart from each other on the opposite side of the aperture 15.

In one embodiment of the present invention, the phosphor layer 13 is made of YPO ₄ : Ce, Ce (Mg, Ba) Al
₁₁ O ₁₉ , BaSiO ₅ : Pb, LaPO ₄ : Ce and (Ce, Ba) MgAl ₁₁ O ₁₉ phosphors were individually used to produce five kinds of rare gas fluorescent lamps 10 having respective phosphor layers. .

The case 20 is mainly made of an aluminum plate having good weather resistance in order to suppress deterioration of ultraviolet rays. The blower fan 30 is constituted by an axial fan. When the axial fan 30 rotates, it draws in air from the suction port 21,
Air is introduced into the photocatalytic air cleaning unit.

The photocatalyst 40 is disposed so as to face the longitudinal direction of the aperture 15 of the rare gas fluorescent lamp 10, and covers almost the entire surface of the support 41 with fine particles mainly composed of TiO _2. The photocatalytic film 42
Is formed.

Next, a method for forming the photocatalyst body 40 will be described. First, a tetraisopropyl titanate monomer chelated with glycerin and acetylacetone, and a vitreous forming agent (P ₂ O ₅ ) are added to an ethyl acetate-ethanol type mixed solvent to form a solution. A suspension is prepared by dispersing and suspending TiO ₂ ultrafine particles of the anatase crystal type. This suspension is applied to a ceramic or metal support surface prepared in advance and subjected to a baking treatment to form anatase crystalline Ti
The O ₂ photocatalyst 40 forms a photocatalyst film 42 by applying fine particles mainly composed of TiO ₂ over almost the entire surface of the support 41.

FIG. 3 is a graph showing the spectrum of the phosphor layer in one embodiment of the photocatalytic mechanism of the present invention.

In the figure, the horizontal axis represents wavelength (nm), and the vertical axis represents relative energy.

In the drawing, curves A to E are all embodiments in which the phosphor layer is changed, and A indicates that the phosphor layer has Ba.
SiO ₅ : Pb, B is YPO ₄ : Ce for the phosphor layer, and C is Ce (Mg, Ba) Al ₁₁ O ₁₉ BaSiO for the phosphor layer.
_5, D is a phosphor layer using LaPO ₄ : Ce, and E is a phosphor layer using (Ce, Ba) MgAl ₁₁ O ₁₉ .

As is apparent from the figure, all the phosphors used in the present invention have a peak wavelength near 350 nm.

The operation of the present embodiment will be described below. The photocatalytic deodorizing device, as shown by the arrow in FIG.
Outside air to be deodorized is sucked in from the suction port 22 and sent from the right side to the left side of the ventilation path 23 by the blower fan 30. That is, the outside air passes through the photocatalyst 40. on the other hand,
The rare gas fluorescent lamp 10 disposed in the ventilation path 23 of the case 20 is energized, and has a wavelength of 147 nm by xenon gas discharge.
When ultraviolet rays of m and 172 nm are generated and the ultraviolet rays generated by the xenon gas discharge are emitted to the phosphor layer, the excited ultraviolet rays having an emission peak in a wavelength band of 300 to 400 nm are emitted from the phosphor layer. You. This ultraviolet light passes through the container and is radiated to the photocatalyst outside the rare gas fluorescent lamp to excite the photocatalysis of the photocatalyst.

When xenon gas discharge is caused by the external electrode through the phosphor layer, the amount of light emitted by the positive column to strongly excite the phosphor layer near the external electrode is significantly increased, and the positive column is formed over the entire external electrode. Diffuses, the self-absorption of ultraviolet rays decreases, so that the amount of ultraviolet rays contributing to the excitation of the phosphor layer increases, and 300 to 400 nm emitted from the phosphor layer
UV light having an emission peak in the wavelength band described above is easily emitted from the phosphor layer. Therefore, the ultraviolet ray emitted from the rare gas fluorescent lamp has a large ratio of the ultraviolet ray in the wavelength band of 300 to 400 nm, so that efficient deodorization and antifouling can be performed. In addition, since the wavelength of most ultraviolet rays is 300 to 400 nm, the influence on the human body and surrounding objects is extremely small. In addition, in the rare gas fluorescent lamp of the present invention, the main component of the discharge medium is composed of xenon, and since xenon has a small pressure change even at a low temperature, the amount of ultraviolet light generated by the discharge also has a small change,
The rise of the discharge can be accelerated. In addition, since the rare gas fluorescent lamp 10 is formed in the form of an aperture, the intensity of ultraviolet rays radiated to the photocatalyst 40 can be increased, and organic substances contained in the outside air are more effectively oxidized and decomposed. In this way, the odor components and tobacco components in the air are oxidatively decomposed and removed, and the purified air is discharged from the discharge port 24.

According to the first aspect of the present invention, since the external electrode is used as the discharge means of the rare gas fluorescent lamp, the positive column generated by the xenon gas discharge strongly excites the phosphor layer near the external electrode. And the amount of ultraviolet light contributing to the excitation of the phosphor layer increased, and the excitation emitted from the phosphor layer was increased. Since the ratio of ultraviolet rays in the wavelength band of 300 to 400 nm is large, it is possible to provide a photocatalyst mechanism capable of performing efficient deodorization and antifouling. In addition, since the wavelength of most ultraviolet rays is 300 to 400 nm, the influence on the human body and surrounding objects is extremely small. In addition, in the rare gas fluorescent lamp of the present invention, the main component of the discharge medium is composed of xenon, and since xenon has a small pressure change even at a low temperature, the amount of ultraviolet light generated by the discharge is also small, and the discharge rises quickly. can do.

According to the second aspect of the present invention, in addition, since the rare gas fluorescent lamp has an appropriate outer diameter, the lamp efficiency of the rare gas fluorescent lamp does not decrease, so that photocatalysis can be more efficiently performed. Can be provided.

According to the third aspect of the present invention, in addition, since the phosphor is appropriately used, ultraviolet rays within a wavelength band of 300 to 400 nm, at which the most efficient oxidative decomposition power of the photocatalyst can be obtained, can be more easily obtained. Thus, it is possible to provide a photocatalytic mechanism capable of more efficiently performing deodorization and antifouling.

According to the fourth and fifth aspects of the present invention,
In addition, since the phosphor layer is formed of an aperture, and the photocatalysts are disposed to face each other along the longitudinal direction of the aperture, ultraviolet rays are more easily radiated to the photocatalyst more intensively. It is possible to provide a photocatalyst mechanism capable of performing deodorization and antifouling more efficiently.

According to the sixth aspect of the present invention, in addition, since the photocatalyst is disposed near the rare gas fluorescent lamp, ultraviolet rays are more efficiently emitted from the rare gas fluorescent lamp to the photocatalyst. It is possible to provide a photocatalytic mechanism capable of efficiently performing deodorization and antifouling.

According to the seventh aspect of the present invention, since the discharge medium contains mercury, ultraviolet light can be emitted mainly at normal temperature by discharging mercury, thereby improving the lamp efficiency of the rare gas fluorescent lamp. Can be provided.

According to the eighth aspect of the present invention, in addition, since the phosphor layer includes the phosphor layer which emits visible light by being excited, it has color rendering properties by emitting visible light. And a photocatalytic mechanism can be provided.

According to the ninth aspect, a photocatalytic deodorizer having the effects of the first to eighth aspects can be provided.

According to the tenth aspect of the present invention, there can be provided a photocatalyst deodorizing apparatus having the effects of the first to eighth aspects.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view of a photocatalytic deodorizer according to an embodiment of the present invention.

FIG. 2 is a schematic enlarged view of a main part of a photocatalytic mechanism, which is also a main part.

FIG. 3 is a graph showing the spectrum of the phosphor layer.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Noble gas fluorescent lamp 20 ... Case as housing | casing 30 ... Blowing fan as blowing means 40 ... Photocatalyst

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Akio Watanabe 4-3-1 Higashishinagawa, Shinagawa-ku, Tokyo Toshiba Litec Co., Ltd. F-term (reference) 4C080 AA07 AA10 BB02 CC01 HH05 JJ01 KK08 LL10 MM02 NN03 NN06 QQ17 4D048 AA22 BA07X BA16Y BA41X BA41Y BB03 CA07 CC40 CD10 EA01

Claims (10)

[Claims] 1. A light-transmitting airtight container having a light-transmitting property, a discharge medium containing a rare gas mainly composed of xenon sealed in the light-transmitting airtight container, provided outside the light-transmitting container. Formed on the inner surface of the light-transmitting hermetically sealed container, and at least 30
A rare gas fluorescent lamp provided with a phosphor layer that emits ultraviolet light in the wavelength band of 0 to 400 nm; and a rare gas fluorescent lamp disposed to face the rare gas fluorescent lamp so as to be irradiated with light from the rare gas fluorescent lamp. And a photocatalyst body. 2. The rare gas fluorescent lamp has an outer diameter of 3 to 20 mm.
2. The photocatalytic mechanism according to claim 1, wherein the photocatalytic mechanism has a tubular shape. 3. The phosphor layer of the general formula YPO₄: Ce, Ce
(Mg, Ba) Al₁₁O ₁₉, BaSiO₅: Pb, La
PO₄: Ce and (Ce, Ba) MgAl₁₁O₁₉
It comprises at least one of the phosphors represented by
3. A light contact according to claim 1, wherein
Medium mechanism. 4. The photocatalytic mechanism according to claim 1, wherein the phosphor layer is formed in an aperture shape having an aperture portion. 5. The photocatalyst mechanism according to claim 4, wherein the photocatalysts are arranged to face each other along the longitudinal direction of the aperture. 6. The photocatalyst mechanism according to claim 1, wherein the photocatalyst is disposed near the rare gas fluorescent lamp. 7. The discharge medium according to claim 1, wherein the discharge medium contains mercury, and the phosphor layer contains a phosphor that emits light when excited by ultraviolet rays emitted by the mercury. Photocatalytic mechanism. 8. The photocatalytic mechanism according to claim 1, wherein the phosphor layer contains a phosphor that emits visible light when excited by ultraviolet light emitted by the rare gas. 9. A housing having an air passage therein for communicating between an inlet and an outlet, and a photocatalyst disposed inside the housing and comprising:
A blowing unit for forcibly venting the air passage to outside air; photocatalyst mechanism and any one claim 1 to 8 is configured to include at least one kind of oxide represented by TiO ₂ and ZnO A photocatalytic deodorizer comprising: 10. A device body; and a photocatalyst disposed in the device body, wherein the photocatalyst includes at least one of oxides represented by TiO ₂ and ZnO. An apparatus with a photocatalytic deodorizing function, comprising: