JP6986382B2 - Purification device and purification method - Google Patents

Description

Embodiments of the present invention relate to a purification device and a purification method.

Conventionally, a device using a photocatalyst is known as a device for purifying air or water. Since the photocatalyst has an antibacterial effect, a deodorizing effect, and a cleaning effect, it is used in equipment such as an air purifying device, an exhaust gas purifying device, or a humidifier. When purifying air or water by utilizing the properties of the photocatalyst, in order to increase the contact area between the photocatalyst and the air or water, the photocatalyst is supported on a porous or sponge-like substrate. ..

In addition, the photocatalyst is activated by irradiation with ultraviolet rays (UV: ultraviolet). Therefore, it is known that it is useful to use the irradiation of ultraviolet rays together when purifying air or water by utilizing the properties of the photocatalyst.

Ultraviolet rays are classified into UV-A band, UV-B band and UV-C band according to wavelength. The ultraviolet rays in the UV-A band, the UV-B band, and the UV-C band are ultraviolet rays having wavelengths of 315 nm to 400 nm, 280 nm to 315 nm, and less than 280 nm, respectively. Of these, ultraviolet rays in the UV-C band are known to have a high bactericidal effect. However, the photocatalyst containing titanium dioxide as a main component is activated by ultraviolet rays in the UV-A band. Therefore, even if the photocatalyst containing titanium dioxide as a main component is irradiated with ultraviolet rays in the UV-A band, the bactericidal effect obtained by the ultraviolet rays in the UV-C band cannot be obtained.

Therefore, the inventor of the present application uses silicate and titanium dioxide as a photocatalyst that can be activated by ultraviolet rays in the UV-C band having a high bactericidal effect, and the weight of titanium dioxide is at least twice the weight of silicate. We have developed a photocatalyst that is mixed so that the weight is less than double (see, for example, Patent Document 1).

_{After that, the inventor of the present application mixed titanium dioxide and anodized aluminum so that the weight ratio was TiO 2} : SiO _x = 2: 1 to 5: 1 so that the bactericidal effect of ultraviolet rays in the UV-C band could be used together. We have developed an impeller-type purifying function moisturizer in which the photocatalyst is coated on a metal plate by anodizing (see, for example, Patent Document 2).

Japanese Unexamined Patent Publication No. 2011-45810 Japanese Unexamined Patent Publication No. 2013-230344

An object of the present invention is to simplify the configuration of a gas purification device such as air using a photocatalyst and make it more compact.

The purification device according to the embodiment of the present invention is a flow path forming a flow of gas to be purified and a plate-shaped member whose surface is coated with at least a part of a photocatalyst, and the flow of gas is the photocatalyst. It is provided with a plate-shaped member arranged so as to be formed along the above, and a lamp for irradiating the photocatalyst with ultraviolet rays.

Further, in the purification method according to the embodiment of the present invention, a plate-shaped member whose surface is coated with at least a part of the photocatalyst is arranged so that a flow of gas to be purified is formed along the photocatalyst. The gas is purified by irradiating the photocatalyst with ultraviolet rays with a lamp.

The block diagram of the purification apparatus which concerns on 1st Embodiment of this invention. The cross-sectional view at the position AA of the purification apparatus shown in FIG. The right side view of the housing shown in FIG. The left side view of the housing shown in FIG. The block diagram of the purification apparatus which concerns on 2nd Embodiment of this invention. The cross-sectional view at the position BB of the purification apparatus shown in FIG. The right side view of the housing shown in FIG. The left side view of the housing shown in FIG. The block diagram of the purification apparatus which concerns on 3rd Embodiment of this invention. The cross-sectional view at the position CC of the purification apparatus shown in FIG. The right side view of the housing shown in FIG. The left side view of the housing shown in FIG.

The purification device and the purification method according to the embodiment of the present invention will be described with reference to the accompanying drawings.

(First Embodiment)
(Configuration and function)
FIG. 1 is a configuration diagram of a purification device according to the first embodiment of the present invention, and FIG. 2 is a cross-sectional view taken along the line AA of the purification device shown in FIG.

The purification device 1 is a device that purifies the gas G to be purified. Typical examples of the gas G to be purified include air in a space sealed for a long time such as in an automobile, exhaust gas from a device equipped with a combustion engine such as an automobile, and volatile organic compounds (VOCs). Examples include gases containing.

The purification device 1 is configured by accommodating a plate-shaped member 3 whose surface is coated with at least a part of the photocatalyst 2 and a lamp 4 that irradiates the photocatalyst 2 with ultraviolet rays (UV) in a cylindrical housing 5. Ru. Inside the tubular housing 5, a flow path 6 for forming a flow of gas G is formed.

The plate-shaped member 3 is arranged inside the housing 5 so that the flow of the gas G is formed along the photocatalyst 2. Therefore, it is preferable to arrange the plate-shaped member 3 so that the plate-shaped member 3 is perpendicular to the traveling direction of the gas G.

In the illustrated example, the rectangular plate-shaped member 3 is placed on the bottom surface inside the rectangular tubular housing 5 having a rectangular cross section. The upper surface side of the rectangular plate-shaped member 3 which is the inner side of the housing 5 is coated with the photocatalyst 2.

The plate-shaped member 3 can be made of a desired material such as metal, ceramic or resin. However, if the plate-shaped member 3 is made of a metal plate, it is suitable for mass production because it has good workability and is inexpensive. Titanium and aluminum are examples of metal plates that are highly practical from the viewpoints of price, processability, and availability.

_{On the other hand, titanium dioxide (TiO 2} ) is known as a typical material of the photocatalyst 2 that coats the plate-shaped member 3. When a part or all of the surface of the metal plate is coated with titanium dioxide, a titanium dioxide film can be formed on the surface of the metal plate by an anodizing method. However, any manufacturing method can be adopted depending on the materials of the plate-shaped member 3 and the photocatalyst 2. For example, the powder of the photocatalyst 2 can be dispersed in a solution and applied to the plate-shaped member 3 by spraying or painting with a brush.

The lamp 4 is a light source that irradiates ultraviolet rays toward the photocatalyst 2. Therefore, the lamp 4 is installed at a position where ultraviolet rays can be irradiated toward the plate-shaped member 3. In the illustrated example, the lamp 4 is arranged so that ultraviolet rays can be irradiated from above the plate-shaped member 3 toward the plate-shaped member 3 across the flow path 6 of the gas G formed inside the housing 5. There is.

Ultraviolet rays are classified into UV-A band, UV-B band and UV-C band according to wavelength. The ultraviolet rays in the UV-A band, the UV-B band, and the UV-C band are ultraviolet rays having wavelengths of 315 nm to 400 nm, 280 nm to 315 nm, and less than 280 nm, respectively. Of these, ultraviolet rays in the UV-C band are known to have a high bactericidal effect. On the other hand, the photocatalyst containing titanium dioxide as a main component is activated by ultraviolet rays in the UV-A band.

However, the photocatalyst formed by mixing silicic acid and titanium dioxide so that the weight of titanium dioxide is 2 times or more and 5 times or less the weight of the silicic oxide is activated by ultraviolet rays in the UV-C band. Can be done. Therefore, the plate-shaped member 3 is coated with a photocatalyst 2 in which titanium dioxide and siliceous oxide are mixed so that the weight ratio is TiO ₂ : SiO _{x = 2: 1 to 5: 1, and the wavelength of the lamp 4 is less than 280 nm.} By using the lamp 4 that irradiates the ultraviolet rays in the UV-C band, both the bactericidal action by the ultraviolet rays themselves and the purifying action by the activation of the photocatalyst 2 can be obtained.

In this case, if the plate-shaped member 3 is made of a metal plate, deterioration due to irradiation with ultraviolet rays can be reduced as compared with the case where the plate-shaped member 3 is made of another material. Therefore, when the plate-shaped member 3 is coated with the above-mentioned photocatalyst 2 obtained by mixing silicic acid and titanium dioxide, it is preferable that the plate-shaped member 3 is made of a metal plate.

The crystal system of titanium dioxide includes anatase type, rutile type, brookite type and amorphous type. When a photocatalyst activated by ultraviolet rays in the UV-C band is produced by mixing with a siliceous oxide, it is preferable to use anatase-type titanium dioxide or titanium dioxide in which anatase-type and rutile-type are mixed.

On the other hand, as the lamp 4, any lamp 4 such as a UV LED, a germicidal lamp, a black light, a semiconductor laser, a mercury lamp, a xenon lamp, a metal halide lamp, a halogen lamp, and a cold cathode discharge tube can be used as long as it can irradiate ultraviolet rays in the UV-C band. Can be used.

From the viewpoint of being able to irradiate every corner of the rectangular photocatalyst 2 with ultraviolet rays, it is rational to use a rod-shaped lamp 4 as shown in the figure. In that case, both ends of the cylindrical housing 5 are closed by the plate-shaped members 7A and 7B in order to support both ends of the rod-shaped lamp 4, and the both ends of the housing 5 are closed by the plate-shaped members 7A and 7B. The socket portion of the rod-shaped lamp 4 can be inserted into the through hole. As a result, the light emitting portion of the lamp 4 can be fixed inside the housing 5.

Regardless of whether or not the lamp 4 is fixed to the plate-shaped members 7A and 7B, one end of the housing 5 is closed by the plate-shaped member 7A to form an end face, and a flow of gas G is formed along the photocatalyst 2. It is preferable to provide the plate-shaped member 7A with an inflow port 8A for allowing the gas G to flow into the flow path 6 from the viewpoint of purifying the gas G as close to the photocatalyst 2 as possible. Similarly, it is effective that the other end of the housing 5 is also closed by the plate-shaped member 7B to form an end face, and the plate-shaped member 7B is provided with a discharge port 8B for discharging the gas G from the flow path 6. It is desirable from the viewpoint of forming a flow of gas G.

3 is a right side view of the housing 5 shown in FIG. 1, and FIG. 4 is a left side view of the housing 5 shown in FIG. 1.

When forming a flow of gas G along the photocatalyst 2 that coats the rectangular plate-shaped member 3, for example, as shown in FIG. 3, a slit having a length corresponding to the width of the plate-shaped member 3 is formed in the gas G. It can be provided in the plate-shaped member 7A as the inflow port 8A. On the other hand, for example, as shown in FIG. 4, a slit having a length corresponding to the width of the plate-shaped member 3 can be provided in the plate-shaped member 7B as a gas G discharge port 8B. As a result, the gas G can be guided to the vicinity of the surface of the plate-shaped member 3 coated with the photocatalyst 2 in the housing 5.

When the inflow port 8A and the discharge port 8B of the gas G are formed at both ends of the housing 5, ultraviolet rays may leak from the inflow port 8A and the discharge port 8B of the gas G. Therefore, it is possible to provide shielding portions 9A and 9B that shield the ultraviolet rays leaking from the inflow port 8A and the discharge port 8B of the gas G from the outside. In the illustrated example, the gas G inflow port 8A is shielded by the first shielding portion 9A having a box structure having a rectangular cross section. Similarly, the gas G discharge port 8B is shielded by the second shielding portion 9B having a box structure having a rectangular cross section.

As a result, the safety of the user can be ensured. In particular, it is known that ultraviolet rays in the UV-C band cause diseases and are dangerous to the human body. Therefore, it is possible to reliably avoid the situation where the user is exposed to ultraviolet rays in the UV-C band.

When the gas G inflow port 8A to the housing 5 and the gas G discharge port 8B from the housing 5 are shielded by the first shielding portion 9A and the second shielding portion 9B, respectively, the first shielding portion is used. It is necessary to form the inflow port 10A of the gas G in the 9A, while forming the discharge port 10B of the gas G in the second shielding portion 9B.

The inflow port 10A of the gas G to the first shielding portion 9A is formed at a position where there is no leakage of ultraviolet rays to the outside and the gas G to be purified can be efficiently taken in from the purification target area. Is appropriate. Similarly, the gas G discharge port 10B from the second shielding portion 9B is located at a position where there is no leakage of ultraviolet rays to the outside and the gas G after purification can be efficiently supplied to the purification target area. It is appropriate to form.

Therefore, as a specific example, as shown in the figure, the gas G inflow port 10A is formed on the side surface of the first shielding portion 9A, while the gas G discharge port 10B is formed on the side surface of the second shielding portion 9B. be able to.

When at least one of the first shielding portion 9A and the second shielding portion 9B has a box structure, a fan (blower) 11 can be provided inside. In other words, at least one of the first shielding portion 9A and the second shielding portion 9B can be used as the casing of the fan 11. In the illustrated example, the fan 11 is arranged inside the first shielding portion 9A which is the intake side of the gas G. Of course, the fan 11 may be arranged inside the second shielding portion 9B corresponding to the discharge side of the gas G, or the fan 11 may be arranged in both the first shielding portion 9A and the second shielding portion 9B. good.

At least one of the first shielding portion 9A and the second shielding portion 9B can also be used as a casing for circuits necessary for driving the purification device 1. In the illustrated example, the inverter board 12 that converts the direct current supplied from the direct current power source into an alternating current and supplies it to the lamp 4, and the switch board 13 for adjusting the strength of the fan 11 are the second shielding portions. It is stored inside 9B. Further, outside the end surface of the second shielding portion 9B, there is a power switch 14 for switching the operation of the purification device 1 between an on state and an off state, and an adjustment switch for adjusting the strength of the fan 11. 15 is provided.

Therefore, when the user wants to increase the purification capacity of the gas G per unit time, the user increases the rotation speed of the fan 11 to increase the intake flow rate of the gas G, while reducing the vibration and noise of the fan 11. If it is desired to do so, adjustments such as reducing the rotation speed of the fan 11 can be performed.

In the purification device 1 and the purification method as described above, a plate-shaped member 3 having at least a part of the surface coated with the photocatalyst 2 is arranged in the flow path 6 through which the gas G to be purified flows, and the photocatalyst 2 is exposed to ultraviolet rays by the lamp 4. The photocatalyst 2 is activated by irradiating the photocatalyst 2.

(effect)
Therefore, according to the purification device 1, the configuration can be extremely simplified and made compact. Moreover, since it is not clogged like a filter, maintenance is very easy.

In particular, UV-C is applied to a plate-shaped member 3 coated with a photocatalyst 2 formed by mixing silica oxide and titanium dioxide so that the weight of titanium dioxide is 2 times or more and 5 times or less the weight of the silica oxide. In the case of the configuration of irradiating the ultraviolet rays of the band, in addition to the purifying action of the activated photocatalyst, the purifying action of the ultraviolet rays of the UV-C band itself can be obtained. Therefore, even if the gas G to be purified passes in the vicinity of the planar photocatalyst 2, the gas G can be purified at a practical level.

In this case, the gas G can be purified even if the distance through which the gas G flows along the photocatalyst 2 is 120 mm or less. As a result, the length of the plate-shaped member 3 coated with the photocatalyst 2 and the length of the housing 5 can be limited to about 120 mm. That is, it is possible to provide a very small purification device 1. Therefore, for example, the length of the plate-shaped member 3 can be made shorter than the length of the standardized lamp 4. In that case, the length of the entire purification device 1 including the first shielding portion 9A and the second shielding portion 9B can be set to a length sufficient to accommodate the standardized lamp 4.

(Second embodiment)
FIG. 5 is a block diagram of the purification device according to the second embodiment of the present invention, and FIG. 6 is a cross-sectional view taken along the line BB of the purification device shown in FIG.

In the purification device 1A according to the second embodiment shown in FIG. 5, a plurality of plate-shaped members 3 coated with the photocatalyst 2 are arranged in the housing 5A, and ultraviolet rays are applied to each plate-shaped member 3 by a common lamp 4. It is different from the purification device 1 in the first embodiment in that it is possible to irradiate the ultraviolet rays. Since the other configurations and operations of the purification device 1A in the second embodiment are not substantially different from those of the purification device 1 in the first embodiment, the same configuration or the corresponding configuration will be described with the same reference numerals. Omit.

As illustrated in FIGS. 5 and 6, four plate-shaped members 3 can be arranged in a housing 5A having a rectangular cross section. That is, the plate-shaped member 3 can be fixed to each surface in the housing 5A. In this case, if the rod-shaped lamp 4 is arranged in the center of the cylindrical housing 5A, the photocatalyst 2 that coats each plate-shaped member 3 with one lamp 4 can be irradiated with ultraviolet rays.

7 is a right side view of the housing 5A shown in FIG. 5, and FIG. 8 is a left side view of the housing 5A shown in FIG.

When the plate-shaped member 3 is fixed to each surface in the housing 5A having a rectangular cross section, the gas G inflow port 8A and the gas G outlet 8B are respectively plated according to the number and position of the plate-shaped member 3. It is appropriate to provide the shaped member 7A and the plate-shaped member 7B. Specifically, as shown in FIG. 7, a plurality of slits having a length corresponding to the width of each plate-shaped member 3 can be provided in the plate-shaped member 7A as the inflow port 8A of the gas G. Similarly, as shown in FIG. 8, a plurality of slits having a length corresponding to the width of each plate-shaped member 3 can be provided in the plate-shaped member 7B as a gas G discharge port 8B. As a result, the gas G can be guided to the vicinity of the surface of the plate-shaped member 3 coated with the photocatalyst 2 in the housing 5A.

According to the second embodiment as described above, the surface area of the photocatalyst 2 can be increased. Therefore, it is possible to increase the volume of the gas G that can be purified per unit time.

(Third embodiment)
FIG. 9 is a block diagram of the purification device according to the third embodiment of the present invention, and FIG. 10 is a cross-sectional view taken along the position CC of the purification device shown in FIG.

In the purification device 1B according to the third embodiment shown in FIG. 9, the point that the plate-shaped member 3 is formed in a cylindrical shape and the inner surface of the plate-shaped member 3 is coated with the photocatalyst 2 is the purification device according to the first embodiment. Different from 1. Since the other configurations and operations of the purification device 1B in the third embodiment are not substantially different from those of the purification device 1 in the first embodiment, the same configuration or the corresponding configuration will be described with the same reference numerals. Omit.

As shown in FIG. 9, when the plate-shaped member 3 is formed in a cylindrical shape and the inner surface is coated with the photocatalyst 2, the inside of the tubular member 3 is formed as a gas G flow path 6. Can be done. Further, by arranging the rod-shaped lamp 4 inside the tubular member 3, the common lamp 4 irradiates each part of the photocatalyst 2 that coats the inner surface of the plate-shaped member 3 with ultraviolet rays. Can be done.

The shape of the cross section of the plate-shaped member 3 may be a square cylinder such as a square cylinder or a hexagonal cylinder, but it is more efficient to make the ultraviolet rays cylindrical as illustrated in FIGS. 9 and 10. It is preferable from the viewpoint of irradiating. That is, if the plate-shaped member 3 is formed in a cylindrical shape and the rod-shaped lamp 4 is arranged at the center position inside the cylindrical plate-shaped member 3, each portion of the photocatalyst 2 can be uniformly irradiated with ultraviolet rays. .. Further, it becomes easy to use the reflected light of the ultraviolet rays again for activating the photocatalyst 2.

11 is a right side view of the housing 5B shown in FIG. 9, and FIG. 12 is a left side view of the housing 5B shown in FIG. 9.

When the plate-shaped member 3 is formed in a cylindrical shape, it is rational to form the housing 5B in a cylindrical shape from the viewpoint of facilitating the installation of the plate-shaped member 3. In this case, the structure of the plate-shaped member 7A and the plate-shaped member 7B that close both ends of the housing 5B while supporting the rod-shaped lamp 4 at both ends is disk-shaped.

The positions, shapes, and numbers of the gas G inflow port 8A to be formed in the plate-shaped member 7A and the gas G discharge port 8B to be formed in the plate-shaped member 7B are photocatalysts forming the inner surface of the cylindrical plate-shaped member 3. It is appropriate to determine that a flow of gas G along 2 is formed. In order to form a flow of gas G along the photocatalyst 2 forming the inner surface of the cylindrical plate-shaped member 3, the gas G is guided in the vicinity of the plate-shaped member 3 in a direction parallel to the surface of the plate-shaped member 3. It should be.

Therefore, for example, as illustrated in FIG. 11, a plurality of circular through holes arranged on the same circle can be formed in the plate-shaped member 7A as the inflow port 8A of the gas G. Similarly, for example, as illustrated in FIG. 12, a plurality of circular through holes arranged on the same circle can be formed in the plate-shaped member 7B as the gas G discharge port 8B. Alternatively, instead of a plurality of circular through holes arranged on the same circle, a plurality of arcuately curved oval through holes may be formed on the same circle.

When the housing 5B has a cylindrical shape, the structure of the first shielding portion 9A and the second shielding portion 9B for preventing the leakage of ultraviolet rays can also be a cylindrical box structure. Therefore, the inflow port 10A and the discharge port 10B of the gas G can be formed on the curved side surfaces of the first shield portion 9A and the second shield portion 9B, respectively. In the example shown in FIG. 9, a plurality of circular through holes arranged on the same circle are provided as the inflow port 10A and the discharge port 10B of the gas G.

According to the third embodiment as described above, not only the surface area of the photocatalyst 2 can be increased, but also the photocatalyst 2 can be efficiently irradiated with ultraviolet rays if the plate-shaped member 3 is formed in a cylindrical shape. It will be possible. Therefore, the volume of the gas G that can be purified per unit time can be further increased.

Further, if the first shielding portion 9A, the second shielding portion 9B, and the housing 5B are formed in a cylindrical shape, the diameter is about 65 mm, which is about the same as that of a PET bottle, and the bottle can be placed in the PET bottle storage area. A portable purification device 1B can also be provided. As a specific example, the diameter of the entire purification device 1B including the first shielding portion 9A and the second shielding portion 9B can be set to about 50 mm to 70 mm, and the length can be set to about 100 mm to 250 mm.

The housing 5B can also be configured by the plate-shaped member 3. However, in order to secure the strength of the housing 5B, it is necessary to make the thickness of the plate-shaped member 3 sufficient. However, the titanium plate, which is a candidate for the material constituting the plate-shaped member 3, has a high strength, and the thicker the plate, the more difficult the molding process becomes. For this reason, the housing 5B, which is responsible for the strength, is constructed by using a material such as aluminum that can be easily molded even if the plate thickness is increased, while the plate-shaped member 3 is made thin when an expensive titanium plate is used. If it can be easily bent, it will lead to effective use of the material.

A titanium plate with a thickness of 0.16 mm was actually coated with a photocatalyst 2 to form a cylindrical shape, and when UV-C band ultraviolet rays were irradiated with a germicidal lamp, the cylindrical plate became the passing distance of gas G. It was confirmed that the gas G has a sufficient purification function even if the length of the shape member 3 is 100 mm or less.

(Other embodiments)
Although the specific embodiments have been described above, the described embodiments are merely examples and do not limit the scope of the invention. The novel methods and devices described herein can be embodied in a variety of other modes. In addition, various omissions, substitutions and changes may be made in the methods and modes of the apparatus described herein without departing from the gist of the invention. The appended claims and their equivalents include such various modalities and variations as embraced in the scope and gist of the invention.

1, 1A, 1B Purification device 2 Photocatalyst 3 Plate-shaped member 4 Lamp 5, 5A, 5B Housing 6 Flow path 7A, 7B Plate-shaped member 8A Inlet 8B Outlet 9A First shield 9B Second shield 10A Inlet 10B Outlet 11 Fan (blower)
12 Inverter board 13 Switch board 14 Power switch 15 Adjustment switch G Gas

Claims (8)

The flow path that forms the flow of gas to be purified,
A metal plate in which at least a part of the surface is coated with a photocatalyst formed by mixing silica oxide and titanium dioxide so that the weight of the titanium dioxide is 2 times or more and 5 times or less the weight of the silica oxide. A metal plate arranged so that the plate thickness direction is perpendicular to the traveling direction of the gas so that the flow of the gas is formed along the photocatalyst.
A lamp that irradiates the photocatalyst with ultraviolet rays in the UV-C band,
A cylindrical housing for accommodating the lamp and the metal plate,
A first plate-shaped member that closes one end surface of the housing, and
A second plate-shaped member that closes the other end surface of the housing,
Equipped with
The metal plate is arranged along the inner surface of the housing and has a rectangular shape or a cylindrical shape extending along the flow path.
An inlet for flowing the gas in the flow path, the way the gas in the housing is guided to the surface of the photocatalyst, the set Keru hand to the first plate member, said flow front SL gas an outlet for discharging from the road, the so the gas in the housing is directed to the vicinity of the surface of the photocatalyst, by kicking set to the second plate member, the flow of the gas along the photocatalyst To be formed ,
The inflow port and the discharge port are slits formed along the surface of the metal plate when the metal plate is rectangular, and a cylinder when the metal plate is tubular. A plurality of circular or arcuately curved oval through holes formed along the inner peripheral surface of the shape.
Purification device. The inner surface of the metal plate formed in a cylindrical shape is coated with the photocatalyst, and the inner surface is coated with the photocatalyst.
The inside of the metal plate formed in the shape of a cylinder is used as a flow path for the gas.
The purification device according to claim 1, wherein the lamp is arranged inside the tubular metal plate. The purification device according to claim 2, wherein the metal plate is formed in a cylindrical shape, and the rod-shaped lamp is arranged at a central position inside the cylindrical metal plate. The purification device according to any one of claims 1 to 3, which is provided with a shielding portion that shields the ultraviolet rays leaking from the inlet and the outlet from the outside. The purification device according to claim 4, wherein at least one of the structure of the shielding portion that shields the ultraviolet rays leaking from the inflow port and the shielding portion that shields the ultraviolet rays leaking from the discharge port is a box structure, and a fan is provided inside. The purification device according to claim 5, wherein an inverter board for supplying an electric current to the lamp and a switch board for adjusting the strength of the fan are housed in the shielding portion having the box structure. The purification device according to any one of claims 1 to 6, wherein the distance through which the gas flows along the photocatalyst is 120 mm or less. A rectangular shape in which at least a part of the surface is coated with a photocatalyst formed by mixing siliceous oxide and titanium dioxide so that the weight of the titanium dioxide is 2 times or more and 5 times or less the weight of the siliceous oxide. Alternatively, the tubular metal plate has a tubular housing so that the plate thickness direction is perpendicular to the traveling direction of the gas so that the flow of the gas to be purified is formed along the photocatalyst. disposed along the inner surface, an inlet for flowing the gas in the housing, wherein as the gas in the housing is guided to the surface of the photocatalyst, to close the one end surface of the housing set Keru while the first plate member, a discharge port for discharging the gas from the housing, the so the gas in the housing is directed to the vicinity of the surface of the photocatalyst, the other end face of the housing by kicking set to the second plate-like member for closing the purification of the gas by the flow of gas so as to be formed along the photocatalyst is irradiated with ultraviolet rays of UV-C band to the photocatalyst by lamp death,
The inflow port and the discharge port are slits formed along the surface of the metal plate when the metal plate is rectangular, and a cylinder when the metal plate is tubular. A plurality of circular or arcuately curved oval through holes formed along the inner peripheral surface of the shape.
Purification method.

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