JP2013252175A - Photocatalytic deodorizing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a photocatalytic deodorizing device capable of achieving miniaturization and thinning while securing air deodorization performance.SOLUTION: A photocatalytic deodorizing device 1 includes: an LED mounting board 11 mounted with a plurality of LED light sources 20 on one surface and formed with ventilation holes 13; and a photocatalytic sheet 31 disposed in parallel to the LED mounting board 20 and having a glass fiber fabric 41 supporting photocatalyst fine particles 53. Air entering from the ventilation holes 13 of the LED mounting board 11 passes through the photocatalytic sheet 31, and a light diffusion plate 21 for diffusing light 90 of the LED light source 20 is disposed between the LED mounting board 11 and the photocatalytic sheet 31.

Description

  The present invention relates to a photocatalyst deodorization apparatus that performs deodorization by decomposing odor components and organic gas molecules in the air using a photocatalyst.

  In recent years, there has been an increasing demand for air purification improvement in so-called semi-enclosed spaces such as living spaces and in cars. VOCs generated from food, ammonia generated as sidestream smoke of tobacco, and building materials, etc. A deodorizing apparatus that removes volatile organic substances such as acetaldehyde is particularly desired.

  Conventionally, this type of deodorizing apparatus is formed in a honeycomb shape by kneading or carrying an adsorbent material that absorbs an odor component and a photocatalytic material that decomposes the odor component into a porous ceramic surface layer or an inorganic substrate, Air is purified by irradiating excitation light from a light source while passing through the honeycomb holes (see Patent Document 1).

  In the deodorizing apparatus described in Patent Document 1, a photocatalyst excitation source such as a fluorescent tube lamp is used for a photocatalyst unit in which photocatalyst fine particles are formed on activated carbon having an odor gas adsorption function and processed into a honeycomb shape. The odor gas is decomposed by irradiating the radiated light from the lamp to activate the photocatalyst fine particles and ventilating the air containing the odor.

  In addition, as a photocatalyst excitation source, Patent Document 2 proposes a photocatalyst deodorization apparatus using a plurality of LEDs (light emitting diode elements) instead of using a lamp such as a fluorescent tube lamp. A photocatalytic deodorization apparatus using LEDs can extend the life of an odor gas adsorption function (see Patent Document 2).

Japanese Patent No. 2574840 JP 2011-136142 A

  Since the deodorizing apparatus described in Patent Document 1 has a honeycomb structure in which fine particles of a photocatalyst are supported on activated carbon as an adsorbent, the catalytic performance of the photocatalyst, that is, the deodorizing performance is low. Because of the honeycomb structure, the light irradiated from the lamp of the photocatalyst excitation source arranged in front of the photocatalyst unit is blocked by the walls of the honeycomb structure, and the light irradiation intensity inside the honeycomb holes is low. Generation | occurrence | production of the area | region with low photocatalytic activity becomes unavoidable, and causes the fall of deodorizing performance. Activated carbon does not propagate light by itself, so when irradiated with excitation light, the photocatalyst fine particle part in contact with the activated carbon becomes a shadow of the photocatalyst fine particle itself, increasing the surface area of the photocatalyst fine particle and increasing the photocatalytic activity. Even if it improves, the effect will be halved. It is possible to provide a plurality of excitation light sources in order to reduce the shadow area generated by the walls of the honeycomb structure, but when a plurality of excitation light sources are provided, when these excitation light sources flow through the air Therefore, the pressure loss increases. If the wall thickness of the honeycomb structure is reduced, shape stability and photocatalyst carrying amount are reduced, and deodorization performance is reduced. A fluorescent tube lamp which is a photocatalytic excitation source has a short life.

  Moreover, in the photocatalyst deodorizing apparatus described in Patent Document 2 described above, the size of the LED that is the photocatalyst excitation source is about several hundred to 1000 nm, and is usually smaller than the size of the deodorizing air. For this reason, even if a plurality of LEDs are provided, each LED approximately acts as a point light source, and each LED irradiates the photocatalyst sheet carrying the photocatalyst fine particles with the emitted light.

  On the other hand, since the photocatalyst deodorization apparatus is required to be reduced in size and weight, the distance between the light emitting surface of the LED and the photocatalyst sheet carrying the photocatalyst particles tends to be small. For this reason, in the photocatalyst sheet, the region of the extremely dark portion (the portion where the photocatalyst fine particles are not excited) increases compared to the region of the extremely bright portion (the portion where the photocatalytic fine particles are excited). As a result, in order to reduce the size and thickness of the photocatalyst deodorization apparatus, the deodorization performance of decomposing odor components and organic gas molecules in the air by the photocatalyst deodorization apparatus has been inevitably lowered.

  The present invention has been made in view of the above, and an object of the present invention is to provide a photocatalyst deodorization apparatus that can be reduced in size and thickness while ensuring the deodorization performance of air.

  In order to achieve the above object, a photocatalytic deodorization apparatus according to claim 1 is arranged in parallel with an LED mounting substrate on which a plurality of LED light sources are mounted on one surface and a ventilation hole is formed, and the LED mounting substrate. A photocatalyst sheet having a glass fiber fabric carrying photocatalyst fine particles, and a photocatalyst deodorizing device configured such that air entering from the ventilation holes of the LED mounting substrate passes through the photocatalyst sheet, the LED The gist is that a light diffusing plate for diffusing the light of the LED light source is disposed between the mounting substrate and the photocatalytic sheet.

In the photocatalyst deodorizing apparatus according to the first aspect, the light from the LED light source can be diffused by the light diffusion plate and applied to the photocatalyst sheet. For this reason, even if the distance between the LED mounting substrate and the photocatalyst sheet is reduced due to the demand for downsizing and thinning of the photocatalyst deodorization device, the diffused light irradiates a wide area of the photocatalyst sheet and widens the photocatalyst sheet. The photocatalyst fine particles can be activated. Therefore, the photocatalyst deodorization apparatus can be reduced in size and thickness while ensuring the deodorization performance of the air. In the photocatalyst deodorization apparatus according to claim 2, the light diffusion plate has a ventilation hole for the light diffusion plate. And the vent hole for the light diffusing plate is formed at a position excluding the region of the light diffusing plate irradiated with the light from the LED light source.

  In the photocatalyst deodorization apparatus according to the second aspect, the air to be deodorized can be smoothly passed to the photocatalyst sheet side through the ventilation hole of the LED mounting substrate and the ventilation hole for the light diffusion plate. Since the vent hole for the light diffusing plate is formed at a position excluding the region of the light diffusing plate irradiated with the light from the LED light source, the light diffusing plate reduces the function of diffusing the light from the LED light source. Without diffusing light, the photocatalyst sheet side can be irradiated.

  In the photocatalyst deodorization apparatus according to claim 3, the photocatalyst sheet has a vent hole for the photocatalyst sheet, and the vent hole for the photocatalyst sheet is formed of the photocatalyst sheet irradiated with the diffused light of the LED light source. It is characterized by being formed at a position outside the region.

  In the photocatalyst deodorization apparatus according to the third aspect, the air to be deodorized can be smoothly passed through the ventilation hole of the LED mounting substrate, the ventilation hole for the light diffusion plate, and the ventilation hole for the photocatalyst sheet. The vent hole for the photocatalyst sheet is formed at a position outside the area of the photocatalyst sheet irradiated with the diffused light of the LED light source, so the photocatalyst sheet deodorizes without deteriorating the function of deodorizing air. be able to.

  In the photocatalyst deodorizing apparatus according to claim 4, the two LED mounting substrates are arranged in parallel, the photocatalytic sheet is arranged in parallel to each of the LED mounting substrates, each of the LED mounting substrate and the photocatalytic sheet The gist is that the light diffusion plate is disposed between them.

  In the photocatalyst deodorization apparatus according to the fourth aspect, air can be deodorized more efficiently by using two LED mounting substrates and two photocatalyst sheets.

  ADVANTAGE OF THE INVENTION According to this invention, the photocatalyst deodorizing apparatus which can achieve size reduction and thickness reduction while ensuring the deodorizing performance of air can be provided.

It is sectional drawing which shows the example of a refrigerator provided with 1st Embodiment of the photocatalyst deodorizing apparatus of this invention. It is a perspective view which shows the partially broken state which shows the preferable structural example of the photocatalyst deodorizing apparatus shown in FIG. It is a figure which shows the housing | casing, 1st LED mounting board | substrate, 2nd LED mounting board | substrate, 1st light diffusing plate, 2nd light diffusing plate, 1st photocatalytic sheet, and 2nd photocatalytic sheet in the photocatalyst deodorizing apparatus shown in FIG. It is a figure which shows the relationship between the deodorizing performance in a 1st photocatalyst sheet and a 2nd photocatalyst sheet, and the intensity of the light which hits a 1st photocatalyst sheet and a 2nd photocatalyst sheet. It is a perspective view which shows the structural example of a 1st LED mounting substrate, a 2nd LED mounting substrate, a 1st light diffusing plate, a 2nd light diffusing plate, a 1st photocatalyst sheet, and a 2nd photocatalyst sheet. It is a figure which shows the conventional photocatalyst deodorizing apparatus. It is a figure which compares and shows the decomposition characteristic of the acetaldehyde in the photocatalyst deodorizing apparatus of 1st Embodiment of this invention, and the decomposition characteristic of the acetaldehyde in the conventional photocatalyst deodorizing apparatus. It is a figure which shows 2nd Embodiment of the photocatalyst deodorizing apparatus of this invention.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention (hereinafter referred to as embodiments) will be described with reference to the drawings.

(First embodiment)
Drawing 1 is a sectional view showing an example of a refrigerator provided with a 1st embodiment of a photocatalyst deodorizing device of the present invention.

  The photocatalyst deodorization apparatus 1 shown in FIG. 1 is disposed in the refrigerator 100 to deodorize the refrigerator 100. The photocatalyst deodorization apparatus 1 is disposed in the cold air passage 103 in the refrigerator 100. In the refrigerator 100, the cooling fan 101 circulates the cold air (air) indicated by the arrows 102 and 104 into the cold air passage at a low wind speed, for example, 0.2 m / sec to 3 m / sec. 103. Thereby, the photocatalyst deodorization apparatus 1 can deodorize the air in a store | warehouse | chamber by the photocatalyst microparticles | fine-particles of the photocatalyst deodorization apparatus 1, without inhibiting the flow of air even under such a low wind speed.

  FIG. 2 is a perspective view illustrating a preferable structure example of the photocatalyst deodorizing apparatus 1 illustrated in FIG. 1 in a partially broken state.

  As shown in FIG. 2, the photocatalytic deodorization apparatus 1 includes a housing 2, a first LED mounting substrate 11, a second LED mounting substrate 12, a first light diffusion plate 21, a second light diffusion plate 22, and a first light diffusion plate 22. A photocatalytic sheet 31 and a second photocatalytic sheet 32 are provided. In FIG. 2, the first LED mounting substrate 11, the second LED mounting substrate 12, the first light diffusing plate 21, and the second light diffusing plate 22 are removed by removing a part of the first side surface portion 2 </ b> A at the top of the housing 2. A first photocatalyst sheet 31 and a second photocatalyst sheet 32 are shown.

  3 shows the housing 2, the first LED mounting substrate 11, the second LED mounting substrate 12, the first light diffusing plate 21, the second light diffusing plate 22, the first photocatalytic sheet 31 and the first photocatalytic deodorizing apparatus 1 shown in FIG. It is a figure which shows the 2 photocatalyst sheet | seat 32. FIG. Also in FIG. 3, the first LED mounting substrate 11, the second LED mounting substrate 12, the first light diffusing plate 21, and the second light diffusing plate 22 are removed by removing a part of the first side surface portion 2 </ b> A at the top of the housing 2. A first photocatalyst sheet 31 and a second photocatalyst sheet 32 are shown.

  First, the housing 2 will be described with reference to FIG. As shown in FIG. 2, the housing 2 is a box composed of a first surface portion 2A, a second surface portion 2B, a third surface portion 2C, and a fourth surface portion 2D, on the air inflow side to be deodorized. The first opening 2F and the second opening 2G on the air outflow side after deodorization.

  As a material for the housing 2, acrylic resin (polymethyl methacrylate resin) may be used from the viewpoint of high weather resistance against ultraviolet rays and less discoloration due to odor gas, and even an acrylic resin may suppress the odor and reduce the degree of polymerization. It is also possible to use a material in which is increased from 10,000 to 15,000.

  The material of the housing 2 may be ABS resin (acrylonitrile-butadiene-styrene copolymer synthetic resin) that is relatively inexpensive and has good moldability, and glass fiber is used as the ABS resin for strength improvement. A reinforced ABS resin that is kneaded into a compound may be used. The above-described material is molded into a casing 2 having a predetermined shape using a mold.

  As shown in FIGS. 2 and 3, the first LED mounting substrate 11, the second LED mounting substrate 12, the first light diffusion plate 21, the second light diffusion plate 22, the first photocatalytic sheet 31, and the second photocatalytic sheet 32 are preferably Are inserted along the fitting groove portions 2M formed on the second surface portion 2B and the fourth surface portion 2D of the housing 2, respectively. As a result, as shown in FIGS. 2 and 3, the housing 2 moves from the direction in which the cool air flows as indicated by the arrow 102 (air inflow direction) to the direction in which the cool air flows as indicated by the arrow 104 (air outflow direction). The first LED mounting substrate 11, the first light diffusing plate 21, the first photocatalytic sheet 31, the second photocatalytic sheet 32, the second light diffusing plate 22, and the second LED mounting substrate 12 are spaced from each other at a predetermined interval. And are housed in the housing 2 while being held parallel to each other.

  Next, the first LED mounting board 11 and the second LED mounting board 12B will be described with reference to FIGS.

  The first LED mounting substrate 11 and the second LED mounting substrate 12 shown in FIGS. 2 and 3 have the same structure and have a plurality of ventilation holes 13. The plurality of ventilation holes 13 are respectively provided in the first LED mounting board 11 and the second LED mounting board 12 so as to be distributed at an appropriate distribution density according to the environment of the installation place of the photocatalyst deodorizing apparatus 1. The first LED mounting substrate 11 and the second LED mounting substrate 12 use, for example, a glass epoxy substrate, and a negative electrode pattern and a positive electrode pattern are formed on the first LED mounting substrate 11 and the second LED mounting substrate 12. . For example, two LED light sources 20 as photocatalyst excitation light sources are mounted on the first LED mounting substrate 11 and the second LED mounting substrate 12, respectively. As shown in FIG. 3, the two LED light sources 20 are mounted on the mounting surface 11 </ b> D of the first LED mounting substrate 11 that faces the light diffusion plate 21. Similarly, the two LED light sources 20 are mounted on the mounting surface 12 </ b> D of the second LED mounting substrate 12 that faces the light diffusion plate 22. The LED light source 20 is also referred to as an LED chip.

  For example, each LED light source 20 mounted includes an LED die having a wavelength λ = 375 nm and a light amount Po = 5.8 mW (forward current 30 mA), a wavelength λ = 405 nm, a light amount Po = 6.2 mW (forward current 30 mA). 2) LED dies are used, and these LED dies are mounted on the first LED mounting substrate 11 and the second LED mounting substrate 12 with a mounter, and then at 240 ° C. for 10 seconds in a low melting point reflow furnace. The first LED mounting substrate 11 and the second LED mounting substrate 12 are fused.

  And the connection to the electrode which consists of the negative electrode pattern of the LED die on the 1st LED mounting board | substrate 11 and the 2nd LED mounting board | substrate 12 after fusion, and a positive electrode pattern uses a wire bonder machine of LED light source 20 Two of the anode side and the cathode side are performed with a 30 μm gold wire. As described above, the first LED mounting substrate 11 and the second LED mounting substrate 12 after connection are subjected to LED die padding that constitutes the LED light source 20 with silicon resin in order to protect the PN junction of the LED light source 20. Has been implemented.

  Although the number of LED dies mounted is four, it may be larger than this number. The light emitted from each LED light source 20 of the first LED mounting substrate 11 is applied to the opposing surface of the first photocatalytic sheet 31 after being diffused by the first light diffusion plate 21. Similarly, the light emitted from each LED light source 20 of the second LED mounting substrate 12 is diffused by the second light diffusing plate 22 and then irradiated to the opposing surface of the second photocatalytic sheet 32. The LED light source 20 constitutes a surface light source, and the surface light source of the LED light source 20 of the first LED mounting substrate 11 is parallel to the first light diffusion plate 21 and the first photocatalytic sheet 31. The surface light source of the LED light source 20 of the second LED mounting substrate 12 is parallel to the second light diffusion plate 22 and the second photocatalytic sheet 32.

  Next, the first light diffusion plate 21 and the second light diffusion plate 22 will be described with reference to FIGS. The first light diffusing plate 21 and the second light diffusing plate 22 have the same structure, and a glass material having a large refractive index difference is dispersed using a highly weather-resistant acrylic resin as a base material, so that a high total light transmission is achieved. A diffusion plate that achieves a high light diffusion rate is used. The first light diffusing plate 21 is disposed between the first LED mounting substrate 11 and the first light diffusing plate 21 in parallel with each other with respect to the first LED mounting substrate 11 and the first light diffusing plate 21. Yes. Similarly, the second light diffusing plate 22 is parallel to the second LED mounting substrate 12 and the second light diffusing plate 22 with an interval between the second LED mounting substrate 12 and the second light diffusing plate 22. Is arranged.

  Next, the first photocatalyst sheet 31 and the second photocatalyst sheet 32 will be described with reference to FIGS. 4 and 5.

  FIG. 4 shows the relationship between the deodorizing performance of the first photocatalyst sheet 31 and the second photocatalyst sheet 32 and the intensity of light hitting the first photocatalyst sheet 31 and the second photocatalyst sheet 32. FIG. 5 shows a structural example of the first LED mounting substrate 11 (second LED mounting substrate 12), the first light diffusion plate 21 (second light diffusion plate 22), and the first photocatalytic sheet 31 (second photocatalytic sheet 32) already described. Is shown.

As shown in FIG. 4, the first photocatalytic sheet 31 and the second photocatalytic sheet 32 have the same structure. As shown in FIG. 4, in the 1st photocatalyst sheet 31 and the 2nd photocatalyst sheet 32, when the intensity of light increases, the deodorizing performance of acetaldehyde increases, but the light intensity has a certain value V (1.0 to When it becomes 1.2 mW / cm ² ) or more, the deodorizing performance of the first photocatalytic sheet 31 and the second photocatalytic sheet 32 is saturated. For this reason, even if the intensity of light hitting the first photocatalyst sheet 31 and the second photocatalyst sheet 32 is increased by a certain value V or more, the deodorizing performance of the first photocatalyst sheet 31 and the second photocatalyst sheet 32 does not increase any more. That is, since the photocatalyst fine particles are saturated at a light intensity of a certain value V or more, the deodorizing performance by the photocatalyst fine particles is also saturated.

  As shown in FIG. 5, the first photocatalyst sheet 31 and the second photocatalyst sheet 32 are both configured in a three-layer structure made of a glass fiber fabric described below. As will be described later, this three-layer structure is composed of one first glass fiber fabric 41 carrying photocatalyst particles and two second glass fiber fabrics 43 not carrying photocatalyst particles. Yes. Two second glass fiber fabrics 43 are provided on both sides so as to sandwich one first glass fiber fabric 41. Here, the term “woven fabric” is used as a general term, but it goes without saying that a knitted fabric or a nonwoven fabric may be used instead of the woven fabric.

  In the photocatalyst deodorization apparatus 1 according to the first embodiment of the present invention, referring to FIG. 3, for example, of the two first photocatalyst sheets 31 and the second photocatalyst sheet 32 described above, the air indicated by an arrow 102 in FIG. The photocatalyst fine particles 53 (see FIG. 5) carried by the first glass fiber fabric 41 of the first photocatalyst sheet 31 disposed on the inflow side are titanium oxide (TiO2) photocatalyst particles. On the other hand, in FIG. 3, the photocatalyst fine particles 53 (see FIG. 5) carried by the first glass fiber fabric 41 of the second photocatalyst sheet 32 disposed on the air outflow side indicated by the arrow 104 are tungsten oxide. (WO3) Photocatalyst fine particles.

  When the photocatalyst deodorizing apparatus 1 decomposes a mixed gas composed of a weak alkaline gas such as ammonia, a neutral gas such as acetaldehyde, and an acidic gas such as NOX, the photocatalyst fine particles are used as described above. The first photocatalytic sheet 31 having titanium oxide (main phase of anatase) photocatalyst fine particles 53 carried on the first glass fiber fabric 41 as 53 is disposed on the air inflow side indicated by an arrow 102, so that it becomes a weak alkali component first. Ammonia is adsorbed and decomposed by titanium oxide (TiO2). Then, under a situation where the ammonia concentration is sufficiently lowered, the second photocatalyst sheet 32 in which tungsten oxide photocatalyst fine particles mainly composed of tungsten oxide (WO3) are supported as the photocatalyst fine particles 53 on the first glass fiber fabric 41 is indicated by an arrow 104. Residual neutral gas can be removed by disposing on the air outflow side shown in FIG. In the case of acid gas, it is removed without impairing the catalytic activity of either photocatalyst fine particle 53.

  A large number of photocatalyst fine particles 53 are sandwiched and supported between glass fibers constituting the first glass fiber fabric 41 shown in FIG.

In the photocatalyst deodorization apparatus 1, the material of the photocatalyst fine particles 53 supported on the first glass fiber fabric 21 is composed of titanium oxide composed of 80% by volume of anatase type titanium oxide and 20% by volume of titanium oxide having a rutile type structure. And having a surface area of about 50 m ² / g and a crystallite diameter of 20 nm (particle diameter before aggregation of the powder) and a catalyst doped with nitrogen in the visible light region (purple, λ = 400 to 450 nm) Two materials of visible light type photocatalyst material (average particle size is about 40 mm) whose activity is known are used.

  In the case of the former titanium oxide, the excitation light source wavelength corresponds to the LED wavelength of 375 nm, and the latter visible light type photocatalyst material corresponds to the LED wavelength.

  The photocatalyst fine particles 53 are supported by immersing glass fibers in an emulsion solution obtained by adding formic acid to pure water and adjusting the pH (hydrogen ion concentration) to 2 to 7 and adding the photocatalyst material for 10 minutes. Is going.

  Since the first glass fiber fabric 41 carrying the photocatalyst fine particles 53 obtained by the above process lacks stability in the above-described state, the end portion is next covered with two mounting frames 45 made of highly light-resistant resin. As described above, the first photocatalytic sheet 31 and the second photocatalytic sheet 32 are configured. That is, as shown in FIG. 5, two second glass fiber fabrics 43 are disposed on both sides of the first glass fiber fabric 41 so as to sandwich the first glass fiber fabric 41, and this three-layer structure is It is held by two mounting frames 45. The two mounting frames 45 have, for example, protrusions on the periphery of one attachment frame 45 and the like, and a recess on the periphery of the other attachment frame 45, and the protrusions are fitted into the recesses. You may comprise the fitting structure etc. which fix a three-layer structure integrally.

  As shown in FIG. 5, the 1st glass fiber fabric 41 is comprised by the glass fiber fabric (it is also called glass cloth) comprised from the weft group and warp group which bundled the transparent glass fiber, for example. A plurality of air holes 51 are formed in the first glass fiber fabric 41. A large number of photocatalyst fine particles 53 are sandwiched and supported between glass fibers constituting a glass fiber fabric. The photocatalyst fine particles 53 are uniformly supported on the entire surface of the first glass fiber fabric 41 of the first photocatalyst sheet 31 and the entire surface of the first glass fiber fabric 41 of the second photocatalyst sheet 32. The photocatalyst fine particles 53 of the first glass fiber fabric 41 are very fine, but are exaggerated in FIG.

  As shown in FIG. 5, the two second glass fiber fabrics 43 are similarly composed of a glass fiber fabric composed of a weft group and a warp group in which transparent glass fibers are bundled, for example. A plurality of vent holes 51 are similarly formed in the two second glass fiber fabrics 43, but the photocatalyst fine particles 53 are not carried.

  The formation positions of the respective vent holes 51 of the glass fiber fabric of the first glass fiber fabric 41 coincide with the formation positions of the respective vent holes 51 of the glass fiber fabric 43. The mounting frame 45 has rectangular openings 49, 49, and the vent holes 51 are in the openings 49. Thereby, air can be smoothly passed through each vent 51 and the opening 49.

  As already described, as shown in FIG. 5, the first LED mounting substrate 11 and the second LED mounting substrate 12 have a plurality of circular ventilation holes 13, for example. As shown in FIG. 5, the first light diffusing plate 21 and the second light diffusing plate 22 have, for example, rectangular ventilation holes 60 for allowing air to pass therethrough. The positions of the first light diffusing plate 21 and the second light diffusing plate 22 in which the vent holes 60 are formed are such that the light 90 of the LED light source 20 is applied to the first light diffusing plate 21 and the second light diffusing plate 22. It is outside the light irradiation area L. In the first light diffusing plate 21 and the second light diffusing plate 22, the position of the vent 60 is the light irradiation region L where the light 90 of the LED light source 20 illuminates the first light diffusing plate 21 and the second light diffusing plate 22. On the other hand, it is preferably set just on the diagonal side. Thereby, the air to be deodorized can be smoothly passed to the photocatalyst sheet side through the ventilation holes of the LED mounting substrate and the ventilation holes for the light diffusion plate. Since the vent hole for the light diffusing plate is formed at a position excluding the region of the light diffusing plate irradiated with the light from the LED light source, the light diffusing plate reduces the function of diffusing the light from the LED light source. It is possible to diffuse light.

  Moreover, the region where the plurality of ventilation holes 51 of the first glass fiber fabric 41 and the plurality of ventilation holes 51 of the second glass fiber fabric 43 are formed as shown in FIG. Twenty lights 90 are out of the light irradiation region LL where the first light diffusion plate 21 and the second light diffusion plate 22 are diffused and irradiated. The plurality of vent holes 51 of the first glass fiber fabric 41 and the plurality of vent holes 51 of the second glass fiber fabric 43 cause resistance to air passage in the glass fiber fabric so that air flows smoothly. Is preventing.

  Thereby, the light L of the LED light source 20 can be reliably irradiated to the first light diffusing plate 21 and the second light diffusing plate 22 while avoiding the air holes 60, and the first light diffusing plate 21 and the second light diffusing plate can be irradiated. The light diffused by the plate 22 can avoid the plurality of air holes 51 and obtain a light irradiation region LL having an enlarged region with respect to the first photocatalyst sheet 31 and the second photocatalyst sheet 32. The air to be deodorized can be smoothly passed through the ventilation hole of the LED mounting substrate, the ventilation hole for the light diffusion plate, and the ventilation hole for the photocatalyst sheet. The vent hole for the photocatalyst sheet is formed at a position outside the area of the photocatalyst sheet irradiated with the diffused light of the LED light source, so the photocatalyst sheet deodorizes without deteriorating the function of deodorizing air. be able to.

  As shown by the arrow 102 in FIG. 3, when the air to be deodorized passes through the vent hole 13 of the first LED mounting substrate 11 of the photocatalyst deodorizing apparatus 1, the air passing through the vent hole 13 shown in FIG. 5 passes through the vent hole 60 of the first light diffusion plate 21 and the vent hole 51 of the first photocatalyst sheet 31. Further, the air passes through the vent hole 51 (see FIG. 5) of the second photocatalyst sheet 32 shown in FIG. 3, passes through the vent hole 51 of the second photocatalyst sheet 32, and passes through the vent hole 13 of the second LED mounting substrate 12. Thus, the air is deodorized, and the air after the deodorization can flow out as shown by the arrow 104 in FIG.

  As described above, the air passes through the vent holes 13, 60, 51, so that the flow of air in the photocatalyst deodorizing apparatus 1 can be made smooth and the air can be deodorized by the photocatalytic deodorizing apparatus 1. The air only needs to pass through the photocatalyst deodorization apparatus 1, but preferably the air holes 13, 60, 51 are provided so that the pressure loss can be reduced when the air passes.

  FIG. 6 shows a conventional photocatalyst deodorization apparatus 1001. In the conventional photocatalyst deodorization apparatus 1001, no light diffusing plate is disposed between the LED mounting substrate 1011 and the photocatalyst sheet 1031, and the light irradiation region 1040 of the light generated by the LED light source 1020 is relative to the photocatalyst sheet 1031. Formed directly. When comparing the area of the light irradiation region LL of the photocatalyst deodorizing apparatus 1 of the first embodiment of the present invention shown in FIG. 5 with the area of the conventional light irradiation region 1040 shown in FIG. 6, the area of the conventional light irradiation region 1040 is shown. Is small.

  As already described, when the distance between the LED mounting substrate 1011 and the photocatalyst sheet 1031 is reduced due to the demand for miniaturization and thinning of the photocatalyst deodorization apparatus, the distance between the LED light source 1020 and the photocatalyst sheet 1031 is small. For this reason, since strong light hits only the photocatalyst particles in the small light irradiation region 1040 of the photocatalyst sheet 1031, the deodorizing performance of the photocatalyst particles in the small light irradiation region 1040 is saturated, but the photocatalyst particles in other regions Deodorizing performance does not improve because it is not exposed to light.

  On the other hand, in the photocatalyst deodorizing apparatus 1 according to the first embodiment of the present invention shown in FIG. 5, the light irradiation region LL enlarged by the first light diffusion plate 21 and the second light diffusion plate 22 is the first photocatalytic sheet. 31 and the second photocatalyst sheet 32 are respectively obtained, so that the portion of the photocatalyst sheet that has not been hit by light is also widely irradiated. For this reason, although it is not strong light, this light hits the photocatalyst fine particles in the wider light irradiation region LL of the first photocatalyst sheet 31 and the second photocatalyst sheet 32 than the light irradiation region 1040 shown in FIG. The photocatalyst fine particles in the irradiation region LL are activated. For this reason, the deodorizing ability of the photocatalyst deodorizing apparatus 1 of the first embodiment of the present invention shown in FIG. 5 is improved as compared with the deodorizing ability of the conventional catalytic deodorizing apparatus 1001 shown in FIG.

  Thus, in 1st Embodiment of the photocatalyst deodorizing apparatus of this invention, the light 90 radiated | emitted from the LED light source 20 is refracted | scattered and scattered by the light diffusing plate 21 (22), and it changes from a point light source to a surface light source approximately. Converted. The ratio of the photocatalyst fine particles that can receive irradiation light increases dramatically by illuminating the photocatalyst sheet 31 (32) carrying the photocatalyst fine particles with the light that has passed through the light diffusion plate 21 (22) as a surface emission source. . On the other hand, when the light diffusion plate is not inserted as in the prior art, most of the photocatalyst fine particles that are not activated (so-called no light hit) are the majority.

  FIG. 5 is a specific example showing that the deodorizing ability of the photocatalytic deodorizing apparatus 1 of the first embodiment of the present invention shown in FIG. 5 is improved as compared with the deodorizing ability of the conventional catalyst deodorizing apparatus 1001 shown in FIG. This will be described with reference to FIG.

  FIG. 7 shows a comparison of the acetaldehyde decomposition characteristics of the photocatalytic deodorization apparatus 1 according to the first embodiment of the present invention and the acetaldehyde decomposition characteristics of the conventional photocatalytic deodorization apparatus 1001. In the graph of FIG. 7, the horizontal axis represents the irradiation time (minutes), and the vertical axis represents the acetaldehyde concentration (%).

  The decomposition characteristics of acetaldehyde in the photocatalytic deodorization apparatus 1 of the first embodiment of the present invention are indicated by black circles, and the decomposition characteristics of acetaldehyde in the conventional photocatalytic deodorization apparatus 1001 are indicated by black triangles. It can be seen that the acetaldehyde concentration in the air in the photocatalytic deodorization apparatus 1 of the first embodiment of the present invention is significantly lower than the acetaldehyde concentration in the air in the conventional photocatalytic deodorization apparatus 1001. Evaluation of the deodorizing performance is performed using a substrate gas of 10 ppm acetaldehyde.

(Second Embodiment)
FIG. 8 shows a second preferred embodiment of the photocatalytic deodorization apparatus of the present invention.

  A photocatalyst deodorizing apparatus 1A shown in FIG. 8 includes one LED mounting substrate 11, one light diffusion plate 21, one photocatalytic sheet 31, and a substrate 70 fixed in parallel by a casing 82. The substrate 70 is also formed with ventilation holes (not shown). Thereby, the photocatalyst deodorizing apparatus 1A shown in FIG. 8 can be further reduced in size and thickness. As described above, the photocatalyst deodorization apparatus 1A shown in FIG. 8 is different from the photocatalyst deodorization apparatus 1 shown in FIG. 3 in that the number of components is reduced, and other configurations are the same, and the same components are the same. Reference numerals are assigned and explanations thereof are omitted.

  In the photocatalyst deodorization apparatus according to the embodiment of the present invention, the light diffusion plate is disposed between the LED mounting substrate and the photocatalyst sheet. Even if the distance from the photocatalyst sheet is set small, the light diffusion plate can diffuse the light from the LED light source. For this reason, since the light irradiation area | region irradiated to a photocatalyst sheet can ensure large compared with the past, practically sufficient deodorizing performance can be ensured. Thereby, the light from the LED light source is scattered by the light scattering plate, and as shown in FIG. 4, for example, the light intensity is applied to the photocatalyst sheet so as not to exceed a certain value V. Can do. For this reason, since the photocatalyst sheet can activate the photocatalyst fine particles in a wider area, the deodorizing performance of air can be improved.

  As already described, the photocatalyst fine particles are saturated at a certain light intensity. In order to avoid this saturation, the light diffused by the light diffusing plate widens the area irradiated on the photocatalyst sheet, reduces bright portions that saturate, and shines light widely and uniformly. By doing so, it is possible to increase the area of the photocatalyst fine particles that are photoactivated by preventing the photocatalyst fine particles from being saturated. Therefore, the deodorizing performance of the photocatalyst deodorizing apparatus according to the embodiment of the present invention can be improved.

  The photocatalyst deodorization apparatus according to the embodiment of the present invention includes an LED mounting substrate on which a plurality of LED light sources are mounted on one surface and formed with ventilation holes, and a glass fiber that is disposed in parallel to the LED mounting substrate and carries photocatalyst fine particles. The photocatalyst sheet which has a textile fabric, and is the photocatalyst deodorizing apparatus comprised so that the air which enters from the ventilation hole of a LED mounting substrate may pass a photocatalyst sheet. A light diffusing plate for diffusing the light from the LED light source is disposed between the LED mounting substrate and the photocatalytic sheet of the photocatalytic deodorizing apparatus.

  Thereby, the light from the LED light source can be diffused by the light diffusing plate and irradiated to the photocatalyst sheet. For this reason, even if the distance between the LED mounting substrate and the photocatalyst sheet is reduced due to the demand for downsizing and thinning of the photocatalyst deodorizing apparatus, the diffused light irradiates a wide area of the photocatalyst sheet and widens the photocatalyst sheet. The photocatalyst fine particles can be activated. For this reason, the photocatalyst deodorization apparatus can be reduced in size and thickness while ensuring the air deodorization performance.

  In the photocatalyst deodorization apparatus according to the embodiment of the present invention, the light diffusion plate has a ventilation hole for the light diffusion plate, and the ventilation hole for the light diffusion plate outside the region of the light diffusion plate irradiated with the light of the LED light source. It is formed at the position. Thereby, the air to be deodorized can be smoothly passed to the photocatalyst sheet side through the ventilation hole of the LED mounting substrate and the ventilation hole for the light diffusion plate. Since the vent hole for the light diffusing plate is formed at a position excluding the region of the light diffusing plate irradiated with the light from the LED light source, the light diffusing plate reduces the function of diffusing the light from the LED light source. It is possible to diffuse light.

  In the photocatalyst deodorization apparatus according to the embodiment of the present invention, the photocatalyst sheet has a vent hole for the photocatalyst sheet, and the vent hole for the photocatalyst sheet excludes the region of the photocatalyst sheet irradiated with the diffused light of the LED light source. Formed in position. Thereby, the air to be deodorized can be smoothly passed through the ventilation hole of the LED mounting substrate, the ventilation hole for the light diffusion plate, and the ventilation hole for the photocatalyst sheet. The vent hole for the photocatalyst sheet is formed at a position outside the area of the photocatalyst sheet irradiated with the diffused light of the LED light source, so the photocatalyst sheet deodorizes without deteriorating the function of deodorizing air. be able to.

  In the photocatalyst deodorizing apparatus according to the embodiment of the present invention, two LED mounting substrates are arranged in parallel, a photocatalytic sheet is arranged in parallel with each LED mounting substrate, and light between each LED mounting substrate and the photocatalytic sheet is light. A diffusion plate is arranged. Thereby, air can be deodorized more efficiently by using two LED mounting substrates and two photocatalyst sheets.

  In the embodiment of the photocatalyst deodorization apparatus of the present invention, the air blowing means for sending air (wind) is not particularly described, but a special air blowing means is not particularly required.

  The present invention has been described with reference to the embodiments. However, each embodiment is an example, and the scope of the invention described in the claims can be variously modified without departing from the scope of the invention. .

  For example, in each of the embodiments of the present invention described above, there are two LED light sources that constitute the LED light source mounted on each LED mounting substrate, but the present invention is not limited to this, and each LED mounting substrate may be provided as necessary. It may be configured by three or more LED light sources. The number of the photocatalyst sheets disposed in the housing is not limited to one or two, and may be three or more as necessary.

  The shape, the number, and the formation position of the ventilation hole 13 for the LED mounting substrate, the ventilation hole 60 for the light diffusion plate, and the ventilation hole 51 for the photocatalyst sheet shown in FIG. 5 are not limited to the illustrated example. In the example shown in FIG. 1, the photocatalyst deodorizing apparatus 1 is disposed in the refrigerator 100 in order to deodorize the refrigerator 100, but the photocatalyst deodorizing apparatus according to the embodiment of the present invention is not limited thereto. It can arrange | position with respect to deodorizing objects other than a refrigerator.

DESCRIPTION OF SYMBOLS 1 Photocatalyst deodorizing apparatus 1A Photocatalyst deodorizing apparatus 2 Case 11 1st LED mounting board 12 2nd LED mounting board 13 Ventilation hole 20 for LED mounting boards LED light source 21 1st light diffusing plate 22 2nd light diffusing plate 31 1st photocatalytic sheet 32 Second photocatalyst sheet 51 Ventilation hole for photocatalyst sheet 53 Photocatalyst fine particle 60 Ventilation hole for light diffusion plate 90 Light of LED light source Light irradiation region LL Light irradiation region

Claims (4)

A plurality of LED light sources are mounted on one surface, and an LED mounting substrate in which ventilation holes are formed, and a photocatalytic sheet that is arranged in parallel to the LED mounting substrate and has a glass fiber fabric carrying photocatalyst fine particles, A photocatalyst deodorization device configured to allow air entering from the ventilation holes of the LED mounting substrate to pass through the photocatalyst sheet,
A photocatalyst deodorizing apparatus, wherein a light diffusion plate for diffusing light of the LED light source is disposed between the LED mounting substrate and the photocatalyst sheet.   The light diffusing plate has a vent hole for the light diffusing plate, and the vent hole for the light diffusing plate is formed at a position excluding the region of the light diffusing plate irradiated with the light from the LED light source. The photocatalyst deodorization apparatus according to claim 1.   The photocatalyst sheet has a vent hole for the photocatalyst sheet, and the vent hole for the photocatalyst sheet is formed at a position outside the area of the photocatalyst sheet irradiated with the diffused light of the LED light source. The photocatalyst deodorization apparatus according to claim 1 or 2.   The two LED mounting substrates are arranged in parallel, the photocatalytic sheet is arranged in parallel with each LED mounting substrate, and the light diffusion plate is arranged between each LED mounting substrate and the photocatalytic sheet. The photocatalyst deodorization apparatus according to any one of claims 1 to 3, wherein

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