JP2005108853A - Fluorescent lamp for photocatalyst and cleansing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fluorescent lamp for photocatalyst small in size, suitable for downsizing a cleansing device, long in service life and excellent in durability, and to provide a cleansing device. <P>SOLUTION: The fluorescent lamp comprises a translucent bulb 1 with an inner diameter of 1 to 10 mm; a discharge medium including a rare gas and mercury sealed in the bulb 1; a pair of cold cathodes 3, 3' sealed at both ends in the bulb 1 and generating discharge in the bulb 1; and a phosphor layer 2 formed on the inner face of the bulb 1 and made of mainly at least one kind among europium-activated borate of alkali earth metal, lead-activated silicate of alkali earth metal, and phosphor in which halogen is added to cerium-activated phosphate of rare earth metal and europium-activated borate of alkali earth metal. Moreover, adding to with this structure, a protective glass tube 15 or a protective tube 16 which transmits at least light in a 300 to 400 nm wavelength range may be installed on the outer face of the bulb 1 for reinforcing the lamp. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a fluorescent lamp for a photocatalyst and a cleaning device using the fluorescent lamp.

In recent years, the response to environmental problems has been remarkable. For example, application and development of photocatalysts are being promoted as a deodorizing measure for the surrounding environment. That is, (a) the photocatalyst is irradiated with ultraviolet rays from a sterilizing lamp to decompose organic components such as acetaldehyde, or (b) the outer surface of a discharge lamp (sterilizing lamp) containing mercury that emits ultraviolet rays by discharge. There is known a discharge lamp in which a photocatalytic layer made of a substance such as titanium oxide (TiO ₂ ) having a photocatalytic action is integrally provided (see Patent Document 1 and Patent Document 2).

  When this type of discharge lamp receives 300-400 nm near-ultraviolet rays emitted from the inside of the discharge lamp, the surface of the photocatalyst layer provided on the outer surface of the bulb is activated to exhibit oxidizing power, and is attached or contacted. Oxidizes and decomposes organic matter, and exhibits deodorizing and other effects. That is, in the atmosphere where the discharge lamp is installed, deodorization or deodorization around the discharge lamp, decomposition of organic components in the atmosphere, and the like are performed.

In addition, substances having a photocatalytic action have been tried to be applied to building materials, chemical processing light sources, lighting fixtures, and the like (see, for example, Patent Documents 3 to 5).
Japanese Examined Patent Publication No. 6-44976 JP-A-1-169866 JP-A-6-304480 JP-A-6-278241 JP 7-111104 A

  However, in order to obtain a photocatalytic action (photocatalytic function), a sterilizing lamp or the like conventionally used as an ultraviolet radiation source is a so-called hot cathode type, and the size or shape of the lamp is relatively large. Therefore, when this type of ultraviolet irradiation source is mounted, for example, a cleaning device such as an air purifier requires a large mounting space in the device, and there is a problem that miniaturization of the device is hindered.

  Further, since the sterilizing lamp has a hot cathode as an electrode, the lamp life is relatively short, about several thousand hours, and there is a problem in terms of maintenance.

  An object of the present invention is to solve the above problems, and to provide a fluorescent lamp for a photocatalyst having a small size, a long lifetime, and excellent durability, and a cleaning device using the fluorescent lamp.

  The invention according to claim 1 is a translucent bulb having an inner diameter of 1 to 10 mm; a discharge medium containing a rare gas and mercury enclosed in the bulb; and sealed at both ends of the bulb to generate discharge in the bulb. A pair of cold cathodes; europium-activated alkaline earth metal borate, lead-activated alkaline earth metal silicate, cerium-activated rare earth phosphate and europium-activated alkaline earth metal boron formed on the inner surface of the bulb; And a phosphor layer comprising, as a main component, at least one of phosphors obtained by adding halogen to an acid salt.

  In the above-mentioned fluorescent lamp for photocatalyst, the bulb is a translucent bulb made of, for example, soda lime or borosilicate glass, quartz glass, or ceramic. The valve is selected to have an inner diameter of 1 to 10 mm (generally an outer diameter of about 1.5 to 12 mm), preferably an inner diameter of 1 to 4 mm. The shape of the valve is straight, annular, U-shaped, W-shaped. , H-shaped, bowl-shaped and the like. That is, the shape of the fluorescent lamp is not particularly limited, but it is necessary to select an inner diameter of 1 to 10 mm (preferably an inner diameter of 1 to 4 mm) from the viewpoint of downsizing and a light source with high durability (long life).

  Further, when the inner diameter of the bulb tube is 10 mm or less, the linear light source is approached, so that the degree of freedom in optical design of emitted ultraviolet rays is increased and the utilization efficiency is improved.

Further, among the discharge medium sealed in the bulb, examples of the rare gas include argon, krypton, xenon, neon, etc., and these may be mixed with other gases. On the other hand, mercury may take a form released from amalgam, for example, a structure in which it is enclosed in a form supported on a cold cathode. Here, the cold cathode may have a structure used in a known cold cathode discharge lamp. For example, a sleeve structure in which an emitter is applied to a nickel sleeve, or a pellet-like structure in which a mercury-releasing structure such as Ti—Hg and a Zr—Al getter are attached to a metal plate can be used. If at least one is a cold cathode, the other may be an external electrode. Further, the phosphor layer is composed of europium activated alkaline earth metal borate, lead activated alkaline earth metal silicate, cerium activated rare earth phosphate and europium activated alkaline earth metal borate. The main component is at least one of the added phosphors. As the europium-activated alkaline earth metal borate, SrB ₄ O ₇ : Eu ²⁺ having a peak wavelength at 365 nm is preferable, and as the lead-activated alkaline earth metal silicate, the peak wavelength is 370 nm. (Ba, Sr, Mg) ₃ Si ₂ O ₇ : Pb ²⁺ and BaSi ₂ O ₅ : Pb ²⁺ having a peak wavelength at 350 nm are preferable. As the cerium-activated rare earth phosphate, YPO ₄ : Ce ³⁺ having a peak wavelength at 357 nm is preferable. Furthermore, for example, _{SrO · SrF · B 2 O 3} : As such Eu ^2+, the halogen is added to the europium-activated alkaline earth metal borate phosphor, the effect of the light output increases can be expected.

In the fluorescent lamp for photocatalyst described in claim 1, it is preferable that the intensity of the ultraviolet light emitted outside is at least 100 μW / cm ² when measured at a position 35 mm away from the outer surface of the bulb. That is, if the UV intensity is not more than 100 μW / cm ² measured at a position 35 mm away from the outer surface of the bulb, sufficient photocatalytic action cannot be given to the photocatalyst and the photocatalyst layer under normal use conditions.

  Moreover, when the fluorescent lamp for photocatalyst is attached to a device having an air passage such as an air purifier, since the outer surface area is small when the bulb inner diameter is 10 mm or less, it is difficult to radiate heat or exchange heat, and temperature reduction can be suppressed.

  In the fluorescent lamp for photocatalyst according to claim 1, it is preferable that a photocatalyst layer is formed on the outer peripheral surface of the bulb. In this case, the photocatalytic layer preferably has a maximum transmittance of 75% or more in a wavelength range of 300 to 400 nm.

The photocatalyst layer is preferably composed mainly of a metal oxide having a photocatalytic action, particularly an anatase TiO ₂ having a photocatalytic action (for example, anatase form accounts for 50% or more by weight). . Here, as the metal oxide having a photocatalytic action, in addition to the TiO ₂ , for example, WO ₃ , LaRhO ₃ , FeTiO ₃ , Fe ₂ O ₃ , CdFe ₂ O ₄ , SrTiO ₃ , CdSe, GaAs, GaP, RuO ₂ Or a mixture of two or more kinds of fine particles.

The thickness of the photocatalyst layer is generally preferably about 0.01 to 0.3 μm, and can be easily formed as follows. For example, the required photocatalyst can be formed by applying and baking a solution of an alkoxy titanate compound such as tetraisopropyl titanate monomer or tetraisopropyl titanate polymer on the outer peripheral surface of the light emitting container. Further, for example, a suspension-dispersion of TiO ₂ fine particles having an average particle diameter 5~10nm about anatase crystal alkoxide solution of titanium was applied to the substrate surface, TiO ₂ having an average particle size of less than 5nm titanium alkoxide component by calcination It can also be formed by crystallization. In this case, a photocatalyst having the same degree of hardness and strength as an optical system film formed of a titanium alkoxide component, and a photocatalytic function equivalent to that of a photocatalyst layer formed of only TiO ₂ fine particles having an average particle diameter of 5 to 70 nm. Can be formed.

Further, when forming a photocatalyst layer mainly composed of anatase TiO ₂ , for example, after chelating tetraisopropyl titanate monomer with glycerin and acetylacetone, an alkyd solution prepared by adding it to an ethyl acetate-ethanol mixed solvent is used. A photocatalyst film mainly composed of anatase-type crystal TiO ₂ fine particles can be formed by coating on a protective film and baking treatment at a temperature of about 700 ° C. for several hours. The metal oxide phase in which the crystalline TiO ₂ or the like is dispersed may be partly or entirely amorphous or porous. Here, the metal oxide is preferably composed mainly of anatase-type crystals, and also ultrafine particles such as TiO ₂ (average particle size of less than about 5 nm) and crystalline TiO ₂ particles (average particle size of about 5 to 70 nm). ) Is not particularly limited, but generally it is preferably about 1: 4 to 4: 1 in terms of mass ratio. In the fluorescent lamp for a photocatalyst according to the first aspect, it is preferable that the translucent bulb is made of black light blue glass.

  In this invention, black light blue glass is based on glass that cuts visible light with a wavelength of about 400 to 780 μm almost completely and transmits ultraviolet light with a wavelength of 400 μm or less, such as nickel oxide (NiO) or If it contains cobalt oxide (CoO) and is generally marketed as BLB glass, and its action is equivalent, the composition and the like are not particularly limited.

  According to a second aspect of the present invention, there is provided a translucent bulb having an inner diameter of 1 to 10 mm; a discharge medium containing a rare gas and mercury enclosed in the bulb; and sealed at both ends of the bulb to generate discharge in the bulb. A pair of cold cathodes; europium-activated alkaline earth metal borate, lead-activated alkaline earth metal silicate, cerium-activated rare earth phosphate and europium-activated alkaline earth metal boron formed on the inner surface of the bulb; A phosphor layer mainly composed of at least one of phosphors in which halogen is added to an acid salt; protection provided on the outer peripheral surface of the bulb and transmitting at least 90% of light in a wavelength range of at least 300 to 400 nm A fluorescent tube for photocatalyst comprising a glass tube.

  In the fluorescent lamp for photocatalyst according to claim 2, it is preferable that a photocatalyst layer is formed on the outer peripheral surface of the protective glass tube.

  The fluorescent lamp for photocatalyst according to claim 2, wherein the protective glass tube is preferably made of quartz glass.

  In the fluorescent lamp for photocatalyst according to claim 2, the protective glass tube is preferably formed of black light blue (BLB) glass.

  The black light blue (BLB) glass is similar to that described above, and is a glass that cuts out so-called visible light almost completely and transmits ultraviolet rays.

  The invention of claim 2 has basically the same structure as that of the invention of claim 1 except that a protective glass tube is fitted on the outer peripheral surface of the bulb. Here, the protective glass tube may be made of, for example, borosilicate glass, quartz glass, BLB glass, etc., but is made of quartz glass in terms of ultraviolet light transmission and strength, and also has a point of blocking visible light. Further, BLB glass is more preferable because it is relatively inexpensive and advantageous in terms of cost.

  On the other hand, this protective glass tube has a wall thickness of at least 0.1 mm, preferably about 0.3 to 1.0 mm, in order to ensure a required protective function. It is desirable to combine a protective glass tube that is 0.1 mm larger. In addition, this combination of the protective glass tubes is a type in which the bulb is fitted or inserted into a cylindrical protective glass tube and the end is fixed via a spacer or the like, or the end of the protective glass tube is hermetically sealed on the outer peripheral surface of the bulb. The welded shape is taken. In particular, when the degree of vacuum in the region formed between the outer peripheral surface of the bulb and the inner wall surface of the protective glass tube is increased by heat-sealing, the rise characteristic of the fluorescent lamp can be improved. .

  According to a third aspect of the present invention, there is provided a translucent bulb having an inner diameter of 1 to 10 mm; a discharge medium containing a rare gas and mercury enclosed in the bulb; and sealed at both ends of the bulb to generate discharge in the bulb. A pair of cold cathodes; europium-activated alkaline earth metal borate, lead-activated alkaline earth metal silicate, cerium-activated rare earth phosphate and europium-activated alkaline earth metal boron formed on the inner surface of the bulb; A phosphor layer mainly composed of at least one of phosphors in which halogen is added to an acid salt; a protective tube provided on the outer peripheral surface of the bulb and transmitting light in a wavelength range of at least 300 to 400 nm; A fluorescent lamp for a photocatalyst.

  4. The fluorescent lamp for photocatalyst according to claim 3, wherein the protective tube is preferably made of a resin mainly composed of at least one of silicone resin, fluorine resin, and polycarbonate resin.

  In the fluorescent lamp for photocatalyst according to claim 3, it is preferable that at least the surface of the protective tube is coated with titanium oxide or contains titanium oxide.

  In the fluorescent lamp for photocatalyst according to claim 3, the protective tube preferably has a light transmittance of 80% or more in a wavelength range of 300 to 400 nm.

  The protective tube is mounted and arranged on the outer peripheral surface of the bulb for the purpose of mechanical reinforcement of the bulb, and has a wall thickness of at least 0.1 mm and a light transmittance within a wavelength range of 300 to 400 nm. Is desirably 80% or more. This protective tube is made of resins mainly composed of heat-resistant and ultraviolet-transmissive resins such as silicone resins and fluorine-based resins, from the viewpoints of long-life and sufficient ultraviolet-ray transmission properties. Those formed are preferred. Here, the silicone resin, the fluorine-based resin, and the polycarbonate resin can adopt a mixed system with other resins in order to adjust or improve the characteristics.

  In addition, the protective tube is contained so that a part of the metal oxide particles having the photocatalytic action is exposed on the surface, or the protective tube surface is covered with a photocatalytic film so that the organic substance is deposited. Can promote oxidative decomposition, removal, and cleansing action. In addition, although the installation of the protection tube with respect to the valve outer peripheral surface is adopted such as a form in which the valve is inserted and disposed in the protection tube, the two may be arranged loosely without being in close contact with each other.

  The fluorescent lamp for a photocatalyst according to any one of claims 1 to 3, wherein the bulb inner diameter is preferably 1 to 4 mm.

  4. The fluorescent lamp for a photocatalyst according to claim 1, wherein the phosphor layer is mainly composed of europium-activated alkaline earth metal borate.

A long-life fluorescent lamp for a photocatalyst can be provided by combining a long-life cold cathode and a europium-activated alkaline earth metal borate (SrB ₄ O ₇ : Eu ²⁺ ). That is, a fluorescent lamp for a photocatalyst (lamp A) in which the phosphor layer on the inner wall surface of the gas valve is formed of SrB ₄ O ₇ : Eu ²⁺ system, and a fluorescent lamp for a photocatalyst (lamp B) formed of a BaSi ₂ O ₅ : Pb ²⁺ system. When the lighting time and the ultraviolet radiation (output) maintenance rate were tested and evaluated, a tendency as shown in FIG. 1 was observed. In FIG. 1, curve A shows the case of lamp A (initial ultraviolet output is about 844 μW / cm ² ), and curve B shows the case of lamp B (initial ultraviolet output is about 783 μW / cm ² ).

  According to a fourth aspect of the present invention, there is provided a main body having a flow passage through which a fluid is forcibly circulated; a photocatalyst body disposed in the flow path; A cleaning apparatus comprising: the fluorescent lamp for photocatalyst according to any one of claims 1 to 3.

  Here, the target device is, for example, an air purifier or a refrigerator, and the fluid is generally a gas. More specifically, the fluid is air or other gas containing an organic component as odor or dust, but depending on the degree of contamination, sewage is also a target. The arrangement of the photocatalyst is preferably in parallel with the inner wall surface of the fluid path. For example, a thin honeycomb structure or mesh support is loaded with a metal oxide having a photocatalytic action and disposed in the fluid path. It is desirable to install. When the fluorescent lamp for photocatalyst itself has a photocatalyst layer on the outer peripheral surface and the fluorescent lamp is arranged in the fluid path, it becomes a form that serves both as an ultraviolet radiation source and a photocatalytic action. It may be omitted.

  In addition, when the photocatalyst is disposed, a means for performing an auxiliary processing action can be provided as appropriate. Further, the installation position of the fluorescent lamp for photocatalyst that functions as an ultraviolet light source is not particularly limited as long as the required ultraviolet rays are emitted so that the photocatalytic action of the photocatalyst is performed, but the fluid flow and transportability are not impaired. Thus, for example, it is desirable to arrange or embed along the inner wall surface of the fluid path.

  According to the first to third aspects of the invention, not only a long life can be achieved by using a cold cathode as a discharge electrode, but also the bulb can be easily reduced in size, and a compact ultraviolet radiation source is provided. In particular, when the light emitting bulb or the protective glass tube is made of BLB glass, it functions as a highly efficient ultraviolet radiation source. Further, in this cold cathode fluorescent lamp, since there is no abnormal heat generation at the end of life, no special end of life detection means or protection circuit is required.

  Further, in the configuration in which the protective glass tube or the protective tube is provided on the outer peripheral surface of the light emitting bulb as in claim 2, it functions as a required ultraviolet light source and is mechanically reinforced. Handling becomes easy during work. Moreover, even if the light emitting bulb is broken, the fragments of the bulb are not scattered in the apparatus.

  In particular, in the case of a configuration in which a protective glass tube is arranged, compactness and improvement in durability are achieved along with good heat resistance and weather resistance compared to a configuration in which a resin-based protective tube is arranged, The required photocatalytic action is easily performed because there is little absorption of ultraviolet rays that excite the photocatalytic action. In addition, when the protective glass tube is provided so as to form an airtight region on the inner wall surface side and the degree of vacuum in this region is increased, a heat insulating action is given.

  According to the fourth aspect of the present invention, the number of replacements of the ultraviolet radiation source can be reduced with the compactness and long life, and an effective cleaning action can be easily achieved in terms of operation efficiency and maintenance.

  According to the first to third aspects of the invention, the life of the light source can be extended with the use of the cold cathode as the discharge electrode, while the electrode portion is miniaturized. As a result, a compact ultraviolet radiation source is provided. In addition, since this cold cathode fluorescent lamp does not have a problem such as abnormal heat generation at the end of its life, it does not require a protection circuit, and contributes to the promotion of downsizing. Furthermore, when a protective glass tube or a protective tube that is heat and ultraviolet resistant and transmits ultraviolet rays or the like is provided on the outer peripheral surface of the glass tube, handling that causes sufficient photocatalytic action on the photocatalytic film (layer) An easy source of ultraviolet radiation will be provided. In particular, in an application as a fluorescent lamp for a photocatalyst such as a cleaning device that does not require brightness, if the arc tube bulb and the protective glass tube are made of BLB glass, the processing efficiency is further promoted.

  In the invention of claim 4, since a compact and long-life fluorescent lamp is used as the ultraviolet radiation source, an operation with a complicated number of replacements can be reduced, and a cleaning operation with high operational efficiency can be achieved.

Hereinafter, embodiments will be described with reference to FIGS. FIG. 2 is a cross-sectional view showing a configuration example of a main part of the fluorescent lamp for photocatalyst according to the first embodiment. Reference numeral 1 denotes a glass tube, and a phosphor layer 2 having a thickness of about 20 to 22 μm that emits light by ultraviolet excitation is provided on an inner wall surface, and a rare gas (argon gas or the like) several Torr and mercury are enclosed. The dimensions of the glass tube 1 are a glass tube having an outer diameter of 4.0 mm, an inner diameter of 3.0 mm, and a length of 308 mm. Reference numerals 3 and 3 ′ denote cold cathodes made of nickel sleeves, which are respectively attached to the distal ends of a pair of lead-in wires 4 and 4 ′ which are respectively sealed at both ends of the glass tube 1. Here, the phosphor layer 2 is formed of a phosphor mainly composed of europium-activated alkaline earth metal borate (SrB ₄ O ₇ : Eu ²⁺ ) having a main emission peak at 368 nm.

  The cold cathodes 3 and 3 'are formed by bending a nickel plate 3a having a width of 2 mm and a length of 15 mm into two as shown in a partially enlarged sectional view in FIG. Opening recesses 3b are respectively formed on opposite sides of the two plate bodies 3a. The recess 3b is filled with about 2 mg of Hg—Ti alloy and Zr—Al alloy powder as a getter. The cold cathodes 3 and 3 'can be made of, for example, "GEMEDIS" (trade name, SAES). In FIG. 3, 3c is a press line of the sealing connection portion of the lead-in wires 4 and 4 ', and 3d is a bead glass constituting the sealing portion.

In the straight tube type photocatalyst fluorescent lamp having the above-described configuration, when a required voltage is applied between the cold cathodes 3 and 3 ', secondary electrons are generated from the cold cathodes 3 and 3' by the generated initial plasma ions. It is discharged and discharge starts in the glass tube 1. Then, ultraviolet rays are emitted by the resonance transition of mercury atoms excited by the electron energy accompanying the discharge, and the ultraviolet rays are converted into visible light or the like by the phosphor layer 2 on the inner wall surface of the glass tube 1 to be 300 to 400 nm. 3700 μW of light output (total radiation flux) including near ultraviolet rays and visible rays was generated. Further, when the intensity of the ultraviolet light was measured at a position 35 mm away from the fluorescent lamp that generated visible light including near ultraviolet light, it was approximately 600 μW / cm ² . FIG. 4 shows the output and intensity (μW / cm ² ) of ultraviolet rays when the lamp is turned on with an inverter circuit (CAX-MIOL: TDK) at room temperature at a lamp current of 5 mA. It is a characteristic view which shows the example of a relationship with distance (mm). In addition, the output and intensity | strength of an ultraviolet-ray were measured with measuring machine UVR-365 (TOPCON company).

On the other hand, a mixed solution in which tetraisopropyl titanate monomer was chelated with glycerin and acetylacetone and a vitreous forming agent (P ₂ O ₅ ) was added to an ethyl acetate-ethanol mixed solvent to prepare a mixed solution. Thereafter, the photocatalyst carrying a photocatalyst mainly composed of anatase crystal type TiO ₂ fine particles and a TiO ₂ phase is applied to a prepared soda-lime glass mesh surface and subjected to a baking treatment at 500 ° C. for 10 hours. Created.

FIG. 5 is a cross-sectional view showing a main configuration of a cleaning device (second embodiment) in which the fluorescent lamp is applied as a sterilization source. In FIG. 5, 5 is a main body having a flow passage 7 through which fluid (for example, drainage) pumped by the pump 6 flows, 8 is an ultraviolet irradiation window provided on a side wall of the flow passage 7, and 9 is the ultraviolet irradiation window. Fluorescent lamp for photocatalyst 8 installed, 8 is a photocatalyst formed by supporting anatase crystal type TiO ₂ fine particles on a glass mesh.

  In the cleaning device having the above-described configuration, the wastewater is caused to flow through the flow passage 7 while the photocatalyst fluorescent lamp 9 is turned on, and the ultraviolet light emitted from the photocatalyst fluorescent lamp 9 is passed through the ultraviolet irradiation window 8 to the wastewater. When sterilization / contamination cleaning treatment was performed by irradiating 10 or the like, good results were obtained.

  Also, when air is flowed instead of wastewater treatment with this washer, a glass mesh carrying a photocatalyst layer is interposed in the flow path 7 region irradiated with ultraviolet rays, so that air can be sterilized efficiently.・ Deodorization treatment can be performed.

Furthermore, in the configuration of the fluorescent lamp for photocatalyst, the fluorescent lamp for photocatalyst (third embodiment) is used under the same conditions except that a glass tube of the same size made from commercially available BLB glass is used as the glass tube 1. Manufactured. Then, when a required voltage is applied between the cold cathodes 3 and 3 ′, the light is turned on, converted into visible light by the phosphor layer 2 on the inner wall surface of the glass tube 1, and output / radiated light (total radiation flux) Among them, visible light of 400 nm or more was almost absorbed by the glass tube 1 made of BLB glass, and near ultraviolet rays of 300 to 400 nm were output and emitted. Further, when the intensity of the ultraviolet ray was measured at a position 35 mm away from this fluorescent lamp, it was almost 600 μW / cm ^{2. When the} fluorescent lamp 9 for photocatalyst was used in the above cleaner, sterilization / contamination was more efficient. A cleaning process can be performed.

  In the above description, the configuration of the straight-tube photocatalyst fluorescent lamp is shown, but the same result was observed when the tube was configured in an annular shape, a U shape, and a W shape.

  FIG. 6 is a sectional view showing an example of the configuration of the main part of a fluorescent lamp for photocatalyst according to the fourth embodiment. 6, the same components as those in FIG. 2 are denoted by the same reference numerals, and detailed description thereof is omitted.

Reference numeral 11 denotes a photocatalyst layer integrally formed on the outer peripheral surface of the glass tube 1 as follows. That is, a mixed solution in which tetraisopropyl titanate monomer is chelated with glycerin and acetylacetone and a vitreous forming agent (P ₂ O ₅ ) is added to an ethyl acetate-ethanol mixed solvent to prepare a mixed solution. Is applied to the outer peripheral surface of the glass tube 1 and subjected to a baking treatment at 500 ° C. for 10 hours to form a photocatalyst layer having a film thickness of 0.2 to 0.3 μm mainly composed of anatase crystal type TiO ₂ fine particles and a TiO ₂ phase. did. In addition, this photocatalyst layer 11 had a transmittance of 75% in the wavelength region of 300 to 400 nm.

  Next, FIG. 7 is sectional drawing which shows the principal part structure of the air conditioning apparatus which concerns on 5th Embodiment. In FIG. 7, reference numeral 12 denotes an air conditioner body, in which a dust removal filter 12a, a heat absorber 12b, a cross flow fan 12c, and the like are housed in a case 12d. The case 12d includes an air intake 12e and an air outlet 12f, and the air outlet 12f is provided with a wind direction adjuster 12g. Further, in the case 12d, a photocatalytic filter 13 is mounted on the air inflow portion 12c 'side of the cross-flow fan 12c, and a small fluorescent lamp (light source) 14 is mounted facing the photocatalytic filter 13 and spaced apart by about 35 mm. Has been.

Here, the photocatalytic filter 13 is a photocatalyst formed by supporting anatase crystal-type TiO ₂ particles on the partition wall surface of a ceramic honeycomb structure. In addition, a small fluorescent lamp 14 as a light source is a fluorescent light whose main component is a europium-activated alkaline earth metal borate phosphor having a main emission peak in a wavelength region of 300 to 400 nm on the inner surface of a glass bulb having an inner diameter of 7 mm. A body layer is formed, cold cathodes are sealed at both ends of the bulb, and mercury and argon gas are sealed inside the bulb. In addition, you may comprise the said heat absorber 12b so that it may act as an object for heating as a heat pump, ie, a radiator, by reversing a cooling cycle.

  According to this air conditioner, the indoor air in which the air conditioner main body 12 is installed is taken in from the air intake 12e, removed by the dust filter 12a, cooled and conditioned by the heat absorber 12b, and then the cross-flow fan. 12c and the airflow direction regulator 12g are discharged into the room from the air outlet 12f. During this time, when the air sucked by the cross-flow fan 12c passes through the photocatalytic filter 13, the air is deodorized and / or antibacterial by exhibiting a required photocatalytic action by light irradiation from the fluorescent lamp 14.

  In the configuration of the fluorescent lamp for photocatalyst, a fluorescent lamp for photocatalyst (sixth embodiment) was used under the same conditions except that a glass tube of the same size made from commercially available BLB glass of the same size was used as the glass tube 1. Form). When this photocatalyst fluorescent lamp replaces the photocatalyst fluorescent lamp 14 of the air conditioner, air deodorization and / or antibacterial action is performed more effectively.

FIG. 8 is a sectional view showing an example of the configuration of the main part of the fluorescent lamp for photocatalyst according to the seventh embodiment. A lead glass tube 1 is provided with a phosphor layer 2 that emits light by ultraviolet excitation on the inner wall surface, and is filled with rare gas (argon gas or the like) several Torr and mercury. The lead glass tube 1 has an outer diameter of 4.0 mm, an inner diameter of 3.0 mm, and a length of 310 mm. Reference numerals 3 and 3 ′ denote cold cathodes made of nickel sleeves, which are respectively attached to the distal ends of a pair of lead-in wires 4 and 4 ′ which are respectively sealed at both ends of the glass tube 1. Here, the phosphor layer 2 is formed of a phosphor mainly composed of europium-activated alkaline earth metal borate (SrB ₄ O ₇ : Eu ²⁺ ) having a main emission peak at 368 nm.

  The cold cathodes 3 and 3 'are formed by bending a nickel plate 3a having a width of 2 mm and a length of 15 mm into two, and a recessed portion 3b opened on the opposite side of the two plates 3a. Are formed respectively. The recess 3b is filled with Hg—Ti alloy and Zr—Al alloy powder as a getter. Reference numeral 15 denotes a protective glass tube made of quartz glass that is fitted on the outer peripheral surface of the lead glass tube 1 and whose both ends are welded and integrated with the outer peripheral surface of the lead glass tube 1.

Here, the protective glass tube 15 has an outer diameter of 8.0 mm, an inner diameter of 7.0 mm, and a length of 280 mm, and has a space between the outer peripheral surface of the lead glass tube 1 and the outer peripheral surface of the protective glass tube 15. The photocatalyst layer 11 is provided on the surface. That is, a solution obtained by chelating a tetraisopropyl titanate monomer with glycerin and acetylacetone and a glassy forming agent (P ₂ O ₅ ) in an ethyl acetate-ethanol mixed solvent was used as a solution for the protective glass tube 15. A photocatalyst layer 11 having a film thickness of 0.2 to 0.3 μm mainly composed of anatase crystal-type TiO ₂ fine particles and a TiO ₂ layer is provided by coating on the outer peripheral surface and baking treatment at 500 ° C. for 10 hours. . In addition, this photocatalyst layer 11 had a transmittance of 75% in the wavelength region of 300 to 400 nm.

The straight tube type photocatalyst fluorescent lamp having the above-described configuration is turned on when a required voltage is applied between the cold cathodes 3 and 3 ', as in the case of the first embodiment. Secondary electrons are emitted, and discharge starts in the glass tube 1. Then, ultraviolet rays are emitted by the resonance transition of mercury atoms excited by the electron energy accompanying this discharge, and further, the ultraviolet rays are converted into visible light by the phosphor layer 2 on the inner wall surface of the glass tube 1 and have a wavelength of 300 to 400 nm. A light output (total radiation flux) of 3700 μW including near ultraviolet rays and visible rays was generated. Further, the intensity of the ultraviolet ray was measured at a position 35 mm away from the fluorescent lamp that generated visible light including near ultraviolet rays, and found to be 100 μW / cm ² .

Further, in the configuration of the fluorescent lamp for photocatalyst, the fluorescent lamp for photocatalyst (eighth embodiment) is used under the same conditions except that a protective glass tube made of commercially available BLB glass is used as the protective glass tube 15. ) Was manufactured. Then, when a required voltage is applied between the cold cathodes 3 and 3 ′, the light is turned on, converted into visible light by the phosphor layer 2 on the inner wall surface of the glass tube 1, and output / radiated light (total radiation flux) Among them, visible light of 400 nm or more was almost absorbed by the protective glass tube 15 made of BLB glass, and near ultraviolet rays of 300 to 400 nm were output and emitted. Further, when the intensity of the ultraviolet ray was measured at a position 35 mm away from the fluorescent lamp, it was approximately 540 μW / cm ² .

  FIG. 9 is a cross-sectional view showing an example of the configuration of the main part of the fluorescent lamp for photocatalyst according to the ninth embodiment. Reference numeral 16 denotes a protective tube provided on the outer peripheral surface of the glass tube 1. Here, the protective tube 16 is a silicone rubber-based, polycarbonate resin-based or fluororesin-based tube having a thickness of about 0.1-1 mm through which light within a wavelength range of at least 300-400 nm can be transmitted. In the configuration shown in the figure, the glass tube 1 is integrally arranged so as to be inserted. In addition, the protective tube 16 may have a configuration in which, for example, anatase crystal-type titanium oxide fine particles are dispersedly contained, or may have a configuration in which a photocatalytic layer is formed on the surface of the protective tube. 9, the same components as those in FIG. 2 are denoted by the same reference numerals, and detailed description thereof is omitted.

When this photocatalyst fluorescent lamp was lit at an input power of 3 W, the ultraviolet intensity at a position 35 mm away was 1000 μW / cm ² and the total radiant flux was 3700 μW. And when it placed close to the photocatalyst and contacted with air containing acetaldehyde, the concentration of acetaldehyde was reduced. Further, this fluorescent lamp for photocatalyst has a lifetime of about tens of thousands of hours, which is advantageous in terms of maintenance.

  10 (a) and 10 (b) show a configuration example of a main part of the fluorescent lamp for photocatalyst according to the tenth embodiment in a cross-sectional view and a vertical cross-section, respectively, and 16 is an outer peripheral surface of the glass tube 1 It is the protection tube provided in the distance. Here, the protective tube 16 is a silicone rubber-based or polycarbonate resin-based tube having a thickness of about 0.1 to 1 mm through which light within a wavelength range of at least 300 to 400 nm can be transmitted. Are integrally arranged in a sealed and interior shape. That is, the glass tube 1 is formed by sealing and leading the lead-in wires 4 and 4 ′ led to both ends of the glass tube 1 and interposing a spacer 17 made of silicone rubber on the outer peripheral surface of the glass tube 1. Contained and enclosed, the structure is taken.

  In addition, the protective tube 16 may have a configuration in which, for example, anatase crystal-type titanium oxide fine particles are dispersedly contained, or may have a configuration in which a photocatalytic layer is formed on the surface of the protective tube. 10A and 10B, the same components as those in FIG. 2 are denoted by the same reference numerals, and detailed description thereof is omitted.

  FIG. 11 is a side view showing the structure of an ultraviolet light source assembled by applying the photocatalytic fluorescent lamp according to the seventh (or eighth) or ninth embodiment. In FIG. 11, 18 is a straight tube-type photocatalytic fluorescent lamp provided with a protective glass tube 15 or a protective tube 16 on the outer peripheral surface of the glass tube 1, 19 is a cap made of silicone resin or silicone rubber, 20 is a lead wiring, 21 is a connector. Here, the protective glass tube 15 is made of quartz glass and is provided with a photocatalyst 11 containing anatase crystal-type titanium oxide fine particles on the outer peripheral surface, and the protective tube 16 is made of anatase crystal-type titanium oxide fine particles. It is a silicone rubber tube that transmits light within a wavelength range of 300 to 400 nm dispersedly contained, and is integrally arranged in such a manner that the glass tube 1 is inserted. When this ultraviolet light source is cleaned in place of the photocatalyst fluorescent lamp 9 in the air purifier having the structure shown in FIG. 4, the catalytic body 10 disposed in the vicinity performs good photocatalytic action. As a result, the concentration of acetaldehyde contained in the air decreased and a cleaning effect was observed.

FIG. 12: is sectional drawing which shows the principal part structure of the air cleaner which concerns on 11th Embodiment. In FIG. 12, reference numeral 22 denotes a main body having a flow passage 24 through which fluid is forcibly conveyed (supplied / discharged) by the blowing means 23, and 25 denotes a photocatalytic fluorescent lamp disposed in the flow passage 24. In this configuration example, the photocatalyst fluorescent lamp 25 has a photocatalyst layer on the outer peripheral surface thereof, and the photocatalyst layer emits ultraviolet rays emitted from the photocatalyst layer to have a required photocatalytic action. Here, the fluorescent lamp 25 for photocatalyst may adopt any configuration shown in FIG. 2, FIG. 6, FIG. 8, FIG. 9, or FIG. In FIG. 12, reference numeral 26 denotes a first filter for removing coarse dust (for example, made of a net), and 27 denotes a second filter for removing minute dust (for example, a high-voltage current electrode plate). In the eleventh embodiment, a sintered photocatalyst layer formed by applying and baking TiO ₂ fine particles may be provided, and a required film thickness can be obtained in a short time by a simple film forming means such as a dip method. Can be formed. Further, in the formation of the photocatalyst layer 11, a solution obtained by chelating a tetraisopropyl titanate monomer with glycerin and acetylacetone and a glassy forming agent (P ₂ O ₅ ) are added to an ethyl acetate-ethanol mixed solvent to form a solution. A suspension prepared by dispersing and suspending anatase crystal-type TiO ₂ ultrafine particles having an average particle size of 7 nm and a specific surface area of 300 m ² / g in this mixed solution can also be used.

  The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the invention. For example, the inner diameter of the bulb is in an allowable range, the material of the cylindrical cup constituting the cold cathode, the type of phosphor forming the phosphor layer, and the metal oxide having a photocatalytic action forming the photocatalyst layer In accordance with the use and standard of the fluorescent lamp, the dimensions and materials other than those in the above embodiments can be appropriately changed.

The characteristic view which shows the example of the output maintenance factor of the ultraviolet-ray of the fluorescent lamp for photocatalysts concerning this invention. Sectional drawing which shows the principal part structure of the fluorescent lamp for photocatalysts concerning 1st Embodiment. FIG. 3 is a partially enlarged cross-sectional view of the photocatalyst fluorescent lamp illustrated in FIG. 2. FIG. 5 is a characteristic diagram showing the relationship between the distance from the photocatalytic fluorescent lamp and the ultraviolet output in the photocatalytic fluorescent lamp according to the first embodiment. Sectional drawing which shows the principal part structure of the washing | cleaning apparatus which concerns on 2nd Embodiment. Sectional drawing which shows the principal part structure of the fluorescent lamp for photocatalysts concerning 4th Embodiment. Sectional drawing which shows the principal part structure of the washing | cleaning apparatus which concerns on 5th Embodiment. Sectional drawing which shows the principal part structure of the fluorescent lamp for photocatalysts concerning 7th, 8th embodiment. Sectional drawing which shows the principal part structure of the fluorescent lamp for photocatalysts concerning 9th Embodiment. The principal part structure of the fluorescent lamp for photocatalysts concerning 10th Embodiment is shown, (a) is a cross-sectional view, (b) is a longitudinal cross-sectional view. The side view which shows the principal part structure which assembled the fluorescent lamp for photocatalysts shown in FIG. 7, FIG. 8 to the ultraviolet-ray source. Sectional drawing which shows the principal part structure of the washing | cleaning apparatus which concerns on 11th Embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Glass tube 2 ... Phosphor layer 3, 3 '... Cold cathode 4, 4' ... Lead wire 5, 12 ... Cleaning apparatus main body 6, 13 ... Fluid pressure sending means 7, 24 ... Flow path 8 …… UV irradiation window 9, 14 …… Fluorescent lamp for photocatalyst
10 ... Photocatalyst 11 using glass mesh as carrier ... Photocatalyst layer 15 ... Protective glass tube 16 ... Protective tube
18 ... Fluorescent lamp for photocatalyst with protective glass tube or tube

Claims (4)

A translucent bulb with an inner diameter of 1-10 mm;
A discharge medium containing noble gas and mercury enclosed in a bulb;
A pair of cold cathodes sealed at both ends in the bulb to generate a discharge in the bulb;
Halogen added to the europium activated alkaline earth metal borate, lead activated alkaline earth metal silicate, cerium activated rare earth phosphate and europium activated alkaline earth metal borate formed on the inside of the bulb A phosphor layer mainly composed of at least one of the phosphors produced;
A fluorescent lamp for a photocatalyst characterized by comprising: A translucent bulb with an inner diameter of 1-10 mm;
A discharge medium containing noble gas and mercury enclosed in a bulb;
A pair of cold cathodes sealed at both ends in the bulb to generate a discharge in the bulb;
Halogen added to the europium activated alkaline earth metal borate, lead activated alkaline earth metal silicate, cerium activated rare earth phosphate and europium activated alkaline earth metal borate formed on the inside of the bulb A phosphor layer mainly composed of at least one of the phosphors produced;
A protective glass tube provided on the outer peripheral surface of the bulb and transmitting at least 90% of light within a wavelength range of at least 300 to 400 nm;
A fluorescent lamp for a photocatalyst characterized by comprising: A translucent bulb with an inner diameter of 1-10 mm;
A discharge medium containing noble gas and mercury enclosed in a bulb;
A pair of cold cathodes sealed at both ends in the bulb to generate a discharge in the bulb;
Halogen added to the europium activated alkaline earth metal borate, lead activated alkaline earth metal silicate, cerium activated rare earth phosphate and europium activated alkaline earth metal borate formed on the inside of the bulb A phosphor layer mainly composed of at least one of the phosphors produced;
A protective tube provided on the outer peripheral surface of the bulb and transmitting light in a wavelength range of at least 300 to 400 nm;
A fluorescent lamp for a photocatalyst characterized by comprising: A body having a flow passage through which fluid is forced to flow;
A photocatalyst disposed in the flow path;
The fluorescent lamp for a photocatalyst according to any one of claims 1 to 3, which is disposed in the main body so as to be able to emit ultraviolet rays to the photocatalyst body;
A cleaning apparatus comprising:

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