JP2021145871A - Photocatalyst apparatus - Google Patents

Abstract

To provide a small-sized and thin photocatalyst air cleaner which, in order to improve photoexcitation efficiency in a photocatalyst plate, a whole surface of the plate is radiated by a light source which can uniformize and radiate light from an LED.SOLUTION: In order to have a catalytic effect exhibited more efficiently for the purpose of realizing a small-sized and thin photocatalyst apparatus, an optical sheet (hereinafter, referred to as a flatter) shown in Fig. 2 and Fig. 3, which uniformly transforms a light distribution of light from an LED light source on a bottom surface of a box shown in Fig. 1, inside of which has a high reflective index, is disposed on an upper surface, and the light made uniform by the flatter is radiated uniformly on a photocatalyst. By enlarging an effective area irradiated with light, there is obtained efficient sterilizing, antimicrobial, and deodorant performance.SELECTED DRAWING: Figure 4

Description

The present invention relates to a thin and compact photocatalyst device that is effective in sterilization, antibacterial, deodorizing, and deodorizing by using an LED light source and a photocatalyst.

In recent years, there has been an increasing demand for improved air purification in so-called semi-closed spaces such as living spaces and cars, and VOCs (volatile organic compounds) generated from food, ammonia generated as second-hand smoke from tobacco, building materials, etc. A photocatalytic device that removes substances (for example, acetaldehyde) is desired.

In addition, global warming may produce new viruses one after another. In order to deal with this, there is a demand for a simple, thin, lightweight, inexpensive, and portable photocatalyst device that can be used in hospitals, living spaces, cars, etc. and can be sterilized and antibacterial.

The present invention has been made in view of the above, and an object thereof is composed of UV light, a short wavelength visible light source, and a photocatalyst typified by titanium oxide, and is free in the air by photocatalyst photocatalyst. It is an object of the present invention to provide a compact and thin photocatalytic device capable of generating radicals and decomposing bacteria, dust and suspended matter in the air.

JP 2002-126066 Utility model registration 3154670 JP 2013-252175 Patent 4280283

Patent Document 1 uses a black light as a photocatalyst member that can transmit air and a light source that is arranged on a substrate and irradiates the photocatalyst member with short-wavelength light in the past. Has been realized. In order to meet the demands for miniaturization and lightening of the photocatalyst deodorizing device, it is necessary to shorten the distance between the light emitting surface of the LED and the photocatalyst sheet coated with the photocatalyst fine particles. However, when the distance between the LED and the photocatalyst is narrow, the region on the photocatalyst sheet is extremely dark (the portion where the photocatalyst fine particles are not excited) as compared with the region where the photocatalyst fine particles are excited. There is a problem of increasing. In addition, in order to obtain a uniform light distribution with the above interval narrow, the distribution of the light that hits the photocatalyst becomes uneven with one LED, so many to reduce the light unevenness. LEDs must be used, which causes problems such as cost.

Patent Document 2 also has the same problems as Patent Document 1.

Patent Document 3 is characterized in that a light diffusing plate that diffuses the light of the LED light source is arranged between the LED mounting substrate and the photocatalyst sheet, and the light of the LED light source is diffused by the diffusing plate. Since the photocatalyst sheet is irradiated, even if the distance between the LED mounting substrate and the photocatalyst sheet is reduced, the diffused light can irradiate a wide area of the photocatalyst sheet and activate the photocatalyst fine particles of the photocatalyst sheet in a wide area. Therefore, the purpose is to reduce the size and thickness of the photocatalyst device while ensuring air sterilization, antibacterial, and deodorizing performance. The problem is that the light from the light source cannot obtain sufficient uniformity even if it is diffused by the diffuser. To obtain sufficient uniformity, the diffuser must be thickened. Drops and efficiency becomes poor. There is also the problem that the device becomes thick.

Patent Document 4 discloses a technique for converting the light from the LED light source used in the present invention into uniform light by a flutter.

Therefore, the present invention has been made in view of the prior art, and an object of the present invention is a small and thin photocatalyst device capable of disassembling and collecting air sterilization, antibacterial, deodorant, dust and suspended matter. In order to realize the above, in order to perform the catalytic effect more efficiently, the light distribution of the light from the bottom LED light source of the box with high reflectance inside is uniformly converted as shown in FIGS. 2 and 3. An optical sheet (hereinafter referred to as a flutter) is placed on the upper surface, and the light homogenized by the flutter is uniformly irradiated to the photocatalyst to expand the effective area to be irradiated with the light, and efficient sterilization, antibacterial, and extinguishing. It obtains odor performance.
The flutter in FIG. 2 is made of a fine foamed resin, for example, the trade name MC-PET, and is generally used with near-ultraviolet to red visible light.
The flutter in FIG. 3 is made of an aluminum sheet with high surface reflectance and is mainly used for near-ultraviolet rays.
The openings in Figures 2 and 3 are on a square, but they can be round, elliptical, rectangular, polygonal, etc. It is possible to produce.

By equalizing the light from the LED with a flutter and irradiating the entire surface with a photocatalyst, efficient air sterilization, antibacterial, and deodorizing performance can be realized. Further, an air flow port can be provided in a corner of the bottom surface of the reflection box away from the LED, and the air flow is applied to the entire surface of the photocatalyst, which has the effect of improving sterilization, antibacterial and deodorizing performance.

Sectional drawing of LED light uniform lighting apparatus disclosed in Japanese Patent 4280283 Top view of optical components (flutter) for light uniformity Top view of optical components (flutter) for light uniformity Cross-sectional view of the photocatalyst device according to the first embodiment Perspective view of the air purifying photocatalyst device according to the first embodiment Cross-sectional view of the air purifying photocatalyst device according to the first embodiment Perspective view of a light uniform lighting device equipped with an air flow port Cross-sectional view of the air purifying photocatalyst device according to the second embodiment Perspective perspective view of the air purifying photocatalyst device according to the second embodiment Perspective view from the back side of the air purifying photocatalyst device according to the second embodiment. Perspective view of an air purifying photocatalyst device that irradiates the photocatalyst sheet from both sides A photocatalyst device in which a plurality of photocatalyst devices of the present invention are combined in a plane. Cylindrical photocatalyst device

The photocatalyst device according to the embodiment of the present invention will be described with reference to the drawings. The embodiments shown below exemplify a photocatalytic device for embodying the technical idea of the present invention, do not specify the present invention, and are included in the claims of other embodiments. Things are equally applicable.

A first embodiment of the present invention will be described with reference to FIG. The configuration of this embodiment is a photocatalyst device 300 including an LED light uniform lighting device and a photocatalyst plate 417. In the LED light uniform lighting device, an LED 409 of ultraviolet light or short wavelength visible light is arranged on the bottom surface of a box 401 whose inner surface is a light reflecting surface, and is emitted from the LED. The irradiated ultraviolet light or visible light causes diffuse reflection in the light diffusion space 407 of the box 410 having a square or square bottom surface to make the light distribution uniform. The homogenized light irradiates the surface of the photocatalyst plate 417 that has passed through the flutter 413 evenly and uniformly, and electrons are excited into the photocatalyst, for example, titanium oxide (anathase type) on the photocatalyst, and oxygen reacts with it to produce air. Hydrogen peroxide and various active oxygens are produced inside, and these oxidatively decompose organic substances. The structure of the flutter will be described in more detail. A central reflection portion in a predetermined range is provided directly above the point light source, and an external reflection portion is provided on the outer periphery of the central reflection portion. It can be said that the central reflecting portion is composed of a reflective member having a ratio, and is formed by a transmissive reflecting portion that reflects more light than the outer reflecting portion.

When the bottom of the box 401 made of MC-PET is 10 cm x 10 cm and the height is 1 cm, Nichia NVSU233B (wavelength is 365 nm, optical output is 1450 mW) is used for LED409, and the forward voltage is 4 V and the current value is 1000 mA. A light intensity of 10 mW / cm2 was obtained on the catalyst plate. Even if the current value flowing through the LED was 100mA, it had bactericidal, antibacterial, and deodorant effects. The photocatalyst plate is composed of a titanium oxide (anathase type) photocatalyst and an adsorbent (activated carbon) powder. In FIGS. 5 and 6, the prefilter 401 and the fan 405 were attached to the above-mentioned photocatalyst device 300, and the suction air 403 was applied to the photocatalyst plate 417 to sterilize, antibacterial, and deodorize the air, and to clean the air from the air exhaust port. It is a perspective view and the cross-sectional view of the air purifier 400 which discharges air. A filter may be attached to the air exhaust port. Here, the description of the LED board, its wiring, and the power supply is omitted.

FIG. 7 shows the air flow ports 701 at the four corners of the bottom surface where the LED 409 of the light reflection box 410 of the photocatalyst device is arranged. Although not described here, it is also possible to provide a light reflector in the air flow space above the air flow port 701 so that air can flow in but light loss can be prevented.

A second embodiment of the present invention will be described with reference to FIG. 8. This embodiment differs from the first embodiment in that the flow of purified air is different. In the first embodiment, the intake air has a structure perpendicular to the photocatalyst, but in the second embodiment, it flows in parallel with the photocatalyst.

The configuration of this embodiment is the same as that of the first embodiment in that the photocatalyst device 300 includes the LED light uniform lighting device and the photocatalyst plate. The action and effect are the same. The difference is that a small cross fan is attached to the side of the photocatalyst device 300, air is sucked from the air intake port 903 of the fan, flows between the photocatalyst plate and the flutter, and the air is sterilized, antibacterial, and deodorized by the photocatalyst. However, the air purifier 500 is discharged from the air exhaust port 415. Unlike the first embodiment, since the air flow is parallel to the photocatalyst, the air on the side closer to the photocatalyst plate tends to have a stronger catalytic effect. The surface shape of the photocatalyst was made uneven, or an air turbulent plate made of a transparent plate that caused air turbulence was placed in the air flow space to improve the photocatalytic action.

A third embodiment of the present invention will be described with reference to FIG. This embodiment is a photocatalyst device in which the photocatalyst device shown in FIG. 4 is targeted at the photocatalyst sheet surface and the photocatalyst sheet is irradiated from both sides to improve the photocatalytic effect. Of course, the catalyst sheet may be one sheet or two sheets.

A fourth embodiment of the present invention will be described with reference to FIG. This embodiment is a photocatalytic device in which the photocatalytic device units shown in FIG. 4 are arranged in a straight line or a plane to increase the photocatalytic action. The sides of adjacent photocatalyst devices may or may not be in contact. When they are in contact with each other, the structure may have no side surface in contact with each other.

A fifth embodiment of the present invention will be described with reference to FIG. In this embodiment, in the photocatalyst device of FIG. 4, the light diffusion box was square or rectangular, but in this embodiment, the bottom surface is circular. Of course, not only a circular shape but also an elliptical shape or a polygonal shape may be used.

Improving air purification and warming in so-called semi-closed spaces such as living spaces, hospitals and cars may produce new viruses one after another, and sterilization and antibacterial measures can be taken to deal with this. There is a demand for a photocatalyst device that is simple, thin, lightweight, inexpensive, compact, and portable. As a result, a simple and clean space can be installed anywhere and contribute to industrial activities.
Left and right can be easily selected using a switch attached to the body, and by attaching a semi-transparent hood to the side end, it can be applied to applications that require high-brightness lighting and direct viewing of the input position by the operator is indispensable. ..

300 photocatalyst device
400 Air purifier of the first embodiment
401 pre-filter
403 Suctioned air
405 fan
407 Light diffusion space (or transparent object)
409 LED light source
410 light reflection box
411 outer frame
413 Optical uniform optical sheet (flutter)
415 Air exhaust
417 Photocatalyst plate
419 Exhaust air
421 Air circulation space
500 Cross-sectional view of the air purifier of the second embodiment
901 Small cross fan,
903 Air intake

Claims (6)

A casing provided with a point light source, a bottom surface and side surfaces having a predetermined area, and an opening for reflecting and diffusely reflecting light on the inner wall surface, and a radiation-side reflecting means for covering the opening and transmitting, reflecting, and diffusely reflecting light. The casing is provided with the point light source arranged on the bottom surface thereof, and the radiation side reflecting means has a central reflecting portion in a predetermined range on a portion directly above the point light source and outward reflection on the outer periphery of the central reflecting portion. Has a part and
The outer reflecting portion is composed of a reflective member that partially transmits, reflects, and diffusely reflects and has a predetermined reflectance, and the central reflecting portion is formed of a transmissive reflecting portion that reflects more light than the outer reflecting portion. A photocatalyst device characterized in that a photocatalyst member and an air flow control member are provided at positions where the light from the light homogenizing light source and the light from the light uniforming light source are uniform. An air purifying device in which suction air is applied to the photocatalyst plate by a prefilter and a fan to the photocatalyst device, and clean air is discharged from an air exhaust port. An air purifier in which a cross fan is attached to the side surface of the photocatalyst device, air is sucked from an air intake port, flows between a photocatalyst plate and a flutter, and is discharged from an air exhaust port. A photocatalyst device that targets the photocatalyst sheet surface and irradiates the photocatalyst device from both sides. A photocatalyst device in which the photocatalyst devices are arranged in a straight line or on a plane. The photocatalyst device is a photocatalyst device having a columnar shape, an elliptical columnar shape, or a polygonal columnar shape.

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