Photocatalytic device

Abstract

To provide a photocatalyst apparatus which is capable of efficiently applying light from a light source to a filter and is easy to maintain.SOLUTION: A photocatalyst apparatus 1 includes multiple filters 2 carrying a photocatalyst, and multiple light source units 3 for applying light to the filter. The multiple filters 2 each form a trough 21 between them and an adjacent filter, and an LED 31 is arranged so as to face only the trough 21. Further, the light source units 3 are detachably attached to the outside of a housing 5 housing the filters 2, and the housing 5 is provided with a window part 51 that transmits light from the LED 31.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to a photocatalytic device that deodorizes and purifies a gas to be treated using a filter carrying a photocatalyst. [Background technology]

[0002] Conventionally, there is known a technology of a photocatalytic device in which a photocatalyst is carried on a breathable filter and light is irradiated onto the filter to deodorize and purify the gas to be treated that passes through the filter. For example, Patent Document 1 introduces an invention of a photocatalytic device in which a photocatalytic filter is arranged at an angle to the flow of the gas to be treated and the housing is made compact. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Utility Model Registration No. 3223983 Summary of the Invention [Problem to be solved by the invention]

[0004] However, the photocatalytic device of Patent Document 1 has a problem in that if a light source for irradiating each filter is added to improve the deodorizing and purifying performance, the manufacturing cost of the device increases.

[0005] Therefore, an object of the present disclosure is to provide a photocatalytic device that can improve deodorizing and purifying performance without adding an additional light source. [Means for solving the problem]

[0006] In order to solve the above problems, the photocatalytic device disclosed herein comprises a plurality of filters carrying a photocatalyst and a plurality of light sources that irradiate the filters with light, wherein the filters form valleys between adjacent filters, and the light sources are positioned so as to face only the valleys.

[0007] The photocatalytic device of the present disclosure also includes a cleaning pipe that sprays a cleaning liquid onto the filter.

[0008] Furthermore, the photocatalytic device of the present disclosure includes a housing that houses a filter, and the housing includes an attachment portion for detachably attaching multiple light sources to the outside of the housing, and a window portion that allows light from the light sources to pass from the outside of the housing to the inside. [Effects of the Invention]

[0009] According to the photocatalytic device of the present disclosure, multiple filters are arranged with valleys formed between adjacent filters, and the light source is positioned facing the valleys, so that light from the light source can be used effectively without waste, resulting in the effect of improving deodorizing and purifying performance without adding additional light sources. [Brief explanation of the drawings]

[0010] [Figure 1] 1 is a perspective view of a photocatalytic device showing an embodiment of the present disclosure. [Figure 2] FIG. 2 is a schematic diagram showing the configuration of the photocatalytic device of FIG. [Figure 3] 5A and 5B are schematic diagrams showing the configuration and operation of a cleaning pipe. [Figure 4] FIG. 2 is a schematic diagram showing an example of unit arrangement of a photocatalytic device. [Figure 5] FIG. 10 is a schematic diagram showing a modified example of the photocatalytic device. [Figure 6] FIG. 1 is a schematic diagram showing the configuration of a conventional photocatalytic device. [Figure 7] 1 is a graph showing the results of a comparative test of acetaldehyde decomposition rates. DETAILED DESCRIPTION OF THE INVENTION

[0011] An embodiment of a photocatalytic device embodying the present disclosure will now be described with reference to the drawings. The cross-sectional views of Figures 2, 3(b), 5, and 6 are cut along a plane parallel to the front of Figure 1.

[0012] 1 includes a plurality of filters 2 carrying a photocatalyst, a plurality of light sources 31 that irradiate the filters 2 with light, a cleaning pipe 4 that sprays a cleaning liquid F onto the filters 2, and a housing 5 that takes in and exhausts the gas G to be treated in the direction of the arrow. The light sources 31 are arranged alternately in a strip-shaped light source unit 3.

[0013] Here, the gas G to be treated is, for example, air containing odor components, organic gas molecules, etc. The material of the filter 2 can be selected from porous ceramics having a three-dimensional mesh structure, etc. The photocatalyst supported on the filter 2 can be selected from titanium oxide, etc. The cleaning liquid F is water, particularly tap water or pure water, etc.

[0014] As the LEDs 31, it is preferable to select LEDs (UV-LEDs) that can irradiate ultraviolet light of 300 to 400 nm. LEDs have directionality, so they can efficiently activate the photocatalyst. LEDs are also highly durable, so maintenance work can be reduced. In addition, by arranging the LEDs 31 alternately in the light source unit 31, heat generated by the LEDs 31 can be efficiently dissipated, improving the durability of the LEDs 31.

[0015] The housing 5 includes an attachment portion 52 for attaching the light source unit 3, a window portion 51 that transmits light from the LEDs 31 from the outside to the inside of the housing 5, and a bracket 53 for combining multiple housings 5 ​​together. The attachment portion 52 is formed in the shape of a rail on the outside of the housing 5, and is provided so that the strip-shaped light source unit 3 can be attached and detached in a sliding manner. The sliding mechanism makes it easy to replace the light source unit 3.

[0016] 2, the filters 2 form valleys 21 between adjacent filters 2, and the LEDs 31 are arranged to face the valleys 21 and irradiate light toward the valleys 21. In this case, from the viewpoint of improving the efficiency of deodorizing and purifying, it is preferable to arrange the light source units 3 in multiple rows.

[0017] At this time, the light from the LED 31 is irradiated in the range of 80 to 120 degrees, so the tilt angle θ with respect to the adjacent filter 2 can be set to 80 to 120 degrees. By arranging the filter 2 and the LED 31 in this manner, the light from the LED 31 can be used more efficiently than in the conventional photocatalytic device 71 (see FIG. 6(a)). Furthermore, because the LED 31 faces only the valley portion 21 and irradiates only the valley portion 21, light leakage is prevented and people working nearby do not feel dazzled.

[0018] As shown in FIG. 3(a), the cleaning pipe 4 is composed of a main body 41 that carries the cleaning liquid F and a nozzle 42 that sprays the cleaning liquid F onto the filter 2. As shown in FIG. 3(b), the cleaning pipe 4 is arranged along the filter 2 inside the housing 5. During maintenance work, by supplying the cleaning liquid F to the cleaning pipe 4 and spraying it from the nozzle 42, harmful components that have accumulated on the filter surface can be easily cleaned away and the photocatalytic effect can be restored. At this time, the light source unit 3 is attached to the outside of the housing 5, so there is no risk of the cleaning liquid F splashing on it.

[0019] When cleaning the filters 2, the photocatalytic device 1 can be placed vertically. This is because, as shown in FIG. 3(b), the cleaning liquid F flows down the inclined surface formed by the filters 2 as indicated by the arrow, allowing all of the filters 2 to be efficiently cleaned. It is also possible to connect the valleys 21 of the filters 2 with a connecting member 7, and form an opening 7a in the connecting member 7. In this case, the cleaning liquid F that flows over the surface of the upper filter 2 passes through the opening 7a and reaches the surface of the lower filter 2, allowing all of the filters 2 to be smoothly cleaned.

[0020] As shown in Fig. 4, multiple photocatalyst devices 1 can be arranged vertically and horizontally by attaching brackets 53 (see Fig. 1) to a frame 6. This allows for flexible arrangement according to the installation space, enabling various structures.

[0021] As shown in Figure 5, it is also possible to have only one light source unit 3 facing the valley portion 21. This makes it possible to reduce the number of light source units 3 while achieving the same level of deodorizing and purifying effect as the conventional photocatalyst device 71 (see Figure 6(b)). Also, in this case, since the LED 31 faces only the valley portion 21, light leakage is prevented and people working nearby do not feel dazzled.

[0022] According to the photocatalytic device 1 configured as described above, multiple filter surfaces can be irradiated using light L emitted from one light source unit 3, so multiple light source units 3 can be assigned to each filter 2, thereby increasing the intensity of the light irradiated to each filter 2. Furthermore, since the LEDs 31 are positioned so as to face only the valleys 21 between adjacent filters 2, light leakage is prevented, preventing dazzlement for surrounding workers. Furthermore, since the light source units 3 are attached to the outside of the housing 5, they can be prevented from getting wet with the cleaning fluid F.

[0023] Figure 7 shows the results of a test comparing the acetaldehyde decomposition rate between the photocatalytic device of the present disclosure (N-type) and a conventional photocatalytic device (V-type: see Figure 6(a)). In this test, a UV-LED was used as the light source unit 3, with an average UV intensity of 6 mW / cm on the surface of the photocatalytic device. 2 , 9mW / cm 2 , 12mW / cm 2 The vertical axis of the graph shows the decomposition rate (%), and the horizontal axis of the graph shows the wind speed (m / sec). Looking at these test results, it can be seen that the N-type has 1.5 to 2.0 times the deodorizing ability at the same power compared to the V-type.

[0024] The present disclosure is not limited to the above-described embodiments, and the shape and configuration of each part can be appropriately changed without departing from the spirit of the present disclosure. [Explanation of symbols]

[0025] 1 Photocatalyst device 2. Filters 3 Light source unit 4 Cleaning pipe 5. Cabinet 6 frames 7 Connecting members 21 Valley 31 LED 41 Cleaning pipe body 42 nozzles 51 Window 52 Mounting part 53 Bracket G Gas to be treated F cleaning solution

Claims

1. The present invention comprises a plurality of filters carrying a photocatalyst, a plurality of light sources for irradiating the filters with light, a housing for accommodating the plurality of filters, and a strip-shaped light source unit in which the plurality of light sources are arranged, The filters form valleys between adjacent filters, the housing includes an attachment portion for detachably attaching the light source unit to the outside of the housing, and a window portion for transmitting light from the light source from the outside to the inside of the housing, the light source is disposed so as to irradiate light toward the valley portion when the light source unit is attached to the housing; The photocatalytic device is characterized in that the mounting portion is formed in a rail shape along the window portion, and is provided so that the light source unit can be attached and detached in a sliding manner.

2. A cleaning pipe for spraying cleaning liquid onto the filter is provided inside the housing, 2. The photocatalytic device according to claim 1, wherein the nozzle of the cleaning pipe is arranged facing the filter surface on the intake side.

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