Gas Purification Equipment

Abstract

To provide a gas purifier that can inhibit an operator from touching a light source.SOLUTION: A gas purifier comprises according to an embodiment comprises: a frame having a space inside of which gas performing processing flows; a photocatalyst filter which is provided inside the frame, and has a photocatalyst; light sources having a substrate which is provided inside the frame and opposes to the photocatalyst filter, and light emitting elements provided for a face of the substrate opposing to the photocatalyst filter; a guard which shows a tabular shape, and is provided inside the frame and between the photocatalyst filter and the light sources, and has a hole through which the gas flows and at least a pair of crosspieces provided inside the hole. When seen from a direction perpendicular to a face of the substrate on which the light emitting elements are provided, the pair of crosspieces is provided while sandwiching the light emitting elements.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] FIELD OF THE INVENTION An embodiment of the present invention relates to a gas purification device. [Background technology]

[0002] Reflecting growing health consciousness, there is an increasing demand for gas purification (e.g., air purification) in so-called closed spaces such as the interiors of trains and automobiles, refrigerators, living spaces, etc. For example, there is an increasing demand for the removal of VOCs (Volatile Organic Compounds) such as ammonia, ethylene, and acetaldehyde contained in the atmosphere, and for deodorizing the atmosphere.

[0003] For this reason, a gas purification device has been proposed that includes a frame having an internal space through which the gas to be treated flows, and a light source and a photocatalytic filter arranged side by side within the frame. In this case, a light-emitting diode that emits ultraviolet light is typically used as the light source, and an ultraviolet-responsive photocatalyst is used as the photocatalytic filter. Such a gas purification device can remove VOCs and other substances contained in the gas using reactive oxygen species generated by photocatalytic action. Furthermore, since ultraviolet light has a bactericidal effect, the generated reactive oxygen species and ultraviolet light can sterilize or inactivate bacteria and viruses to a certain extent.

[0004] Since the photocatalytic filter is installed in the space through which the gas to be treated flows, dust contained in the gas may adhere to the photocatalytic filter. For this reason, photocatalytic filters are generally maintained periodically or as needed.

[0005] However, a light source is provided inside the frame along with the photocatalytic filter. Therefore, when performing maintenance on the photocatalytic filter, there is a risk that a worker may come into contact with the light-emitting diode provided in the light source. In this case, for example, if a worker touches the ultraviolet light emitting portion of the light-emitting diode, the ultraviolet light emitting portion may deteriorate or become dirty, resulting in a decrease in illuminance. Furthermore, immediately after the gas purification device is shut down, the temperature of the light-emitting diode is high. Therefore, it is preferable to make it difficult for a worker to come into contact with the light-emitting diode when performing maintenance on the photocatalytic filter.

[0006] In this case, for example, an interlock function can be provided to stop the operation of the gas purification device when a door on the frame is opened. However, it takes some time for the temperature of the light-emitting diode to decrease. Also, it is not possible to prevent deterioration or contamination of the ultraviolet light emitting part of the light-emitting diode, which may occur when an operator touches the ultraviolet light emitting part of the light-emitting diode.

[0007] Therefore, there has been a demand for the development of a gas purification device that can prevent workers from coming into contact with the light source. [Prior art documents] [Patent documents]

[0008] [Patent Document 1] Japanese Patent Application Laid-Open No. 2011-218073 Summary of the Invention [Problem to be solved by the invention]

[0009] The problem to be solved by the present invention is to provide a gas purification device that can prevent an operator from coming into contact with a light source. [Means for solving the problem]

[0010] The gas purification device according to the embodiment comprises a frame having a space therein through which the gas to be treated flows; a photocatalytic filter having a photocatalyst disposed inside the frame; a light source having a substrate disposed inside the frame facing the photocatalytic filter and a light-emitting element disposed on the surface of the substrate facing the photocatalytic filter; and a plate-shaped guard disposed inside the frame between the photocatalytic filter and the light source, having a hole through which the gas flows and at least a pair of bars disposed inside the hole. When viewed from a direction perpendicular to the surface of the substrate on which the light-emitting element is disposed, the pair of bars are disposed to sandwich the light-emitting element. When viewed from a direction perpendicular to the surface of the substrate where the light emitting element is provided, the area of ​​the region of the guard that overlaps with the substrate is defined as S1 (mm 2 ), and the area of ​​the substrate is S2 (mm 2 ) the following equation is satisfied: 3%≦(S1(mm 2 ) / S2(mm 2 ))×100 [Effects of the Invention]

[0011] According to an embodiment of the present invention, it is possible to provide a gas purification device that can prevent an operator from coming into contact with a light source. [Brief explanation of the drawings]

[0012] [Figure 1] FIG. 2 is a schematic perspective view of the gas purification device as seen from the intake side. [Figure 2] FIG. 2 is a schematic perspective view of the gas purification device as seen from the exhaust side. [Figure 3] 2 is a schematic cross-sectional view of the gas purification device in FIG. 1 taken along line AA. [Figure 4] FIG. 2 is a schematic plan view illustrating a light source and a guard. [Figure 5] 10 is a table illustrating the relationship between the width of the crosspiece and the degree of difficulty when the worker's fingers reach the light-emitting elements. [Figure 6] 10 is a table illustrating the relationship between the width dimension of the crosspiece and the performance of the gas purification device. [Figure 7]10 is a schematic side view illustrating the light source and the guard when viewed from a direction parallel to the surface of the substrate on which the light emitting element is provided. FIG. [Figure 8] 10 is a table illustrating the relationship between the distance d (mm) and the degree of difficulty when the worker's finger reaches the light-emitting element. [Figure 9] 10 is a schematic cross-sectional view illustrating the light-emitting element and a pair of rails when viewed from a direction parallel to the surface of the substrate on which the light-emitting element is provided. FIG. [Figure 10] 10 is a table illustrating the relationship between the area S3 (mm 2 ), the difficulty of the worker's finger reaching the light-emitting element, and the performance of the gas purification device. DETAILED DESCRIPTION OF THE INVENTION

[0013] Hereinafter, embodiments will be illustrated with reference to the drawings. In the drawings, like components are designated by like reference numerals and detailed descriptions thereof will be omitted where appropriate. FIG. 1 is a schematic perspective view of the gas purification device 1 as seen from the intake side. FIG. 2 is a schematic perspective view of the gas purification device 1 as seen from the exhaust side. FIG. 3 is a schematic cross-sectional view of the gas purification device 1 in FIG. 1 taken along line AA. As shown in FIGS. 1 to 3, the gas purification device 1 includes, for example, a frame 2, a filter 3, a fan 4, a photocatalytic filter 5, a light source 6, and a guard 7.

[0014] The frame 2 is box-shaped. When viewed from the intake side of the gas G, the outline of the frame 2 can be, for example, a rectangle. In this case, the outline of the frame 2 can also be, for example, a polygon. However, in consideration of the attachment and detachment of the photocatalytic filter 5 and space efficiency, which will be described later, it is preferable that the outline of the frame 2 be a rectangle.

[0015] For example, the frame 2 has a rectangular parallelepiped shape and has a space inside through which the gas G to be treated flows. A photocatalytic filter 5 and a light source 6 are provided inside the frame 2. A hole 2a is provided at one end (the end on the intake side) of the frame 2. The hole 2a serves as an inlet for the gas G to be treated. A hole 2b is provided at the other end (the end on the exhaust side) of the frame 2. The hole 2b faces the hole 2a. The hole 2b serves as an outlet for the treated gas G. Therefore, an airflow can be formed inside the frame 2 that flows from the hole 2a toward the hole 2b.

[0016] The gas G is, for example, primarily composed of air and contains at least one of the substances to be treated, bacteria, and viruses. The substances to be treated may be any substances that can be purified by photocatalysis. The substances to be treated may be, for example, ammonia, ethylene, and VOCs such as acetaldehyde.

[0017] As shown in FIG. 3, brackets 2c, 2d, and 2e are provided inside the frame 2. A photocatalytic filter 5 is detachably provided on bracket 2c. Bracket 2c holds the peripheral portion of the photocatalytic filter 5. A guard 7 is detachably provided on bracket 2d. Bracket 2d holds the peripheral portion of the guard 7. A light source 6 is detachably provided on bracket 2e. Bracket 2e holds the peripheral portion of the light source 6.

[0018] The frame 2 has an opening on its side. A lid 2f can be attached and detached to the opening on the side of the frame 2. The photocatalytic filter 5, light source 6, and guard 7 can be attached and detached through the opening on the side of the frame 2. The frame 2 can also have a connector 2g on its side or other location for electrically connecting the light source 6 to a lighting circuit or power source provided outside the gas purification device 1.

[0019] The material of the frame 2 and the lid 2f is not particularly limited. The material of the frame 2 and the lid 2f can be, for example, metal. The metal can be, for example, iron, stainless steel, aluminum alloy, etc. When the material of the frame 2 and the lid 2f is metal, the frame 2 and the lid 2f can be formed by, for example, sheet metal processing. The frame 2 and the lid 2f illustrated in Figures 1 to 3 are metal frames 2 and lid 2f formed by, for example, sheet metal processing.

[0020] The frame 2 and the lid 2f may be made of, for example, a thermoplastic resin. Examples of the thermoplastic resin include ABS resin (acrylonitrile-butadiene-styrene copolymer synthetic resin), polypropylene resin, and acrylic resin (polymethyl methacrylate resin). When the frame 2 and the lid 2f are made of a thermoplastic resin, the frame 2 and the lid 2f may be formed by, for example, injection molding.

[0021] The filter 3 covers a hole 2a provided at the intake side end of the frame 2. As shown in Figures 1 and 3, the filter 3 can be detachably attached to the intake side end of the frame 2 by a bracket 3a. The bracket 3a is frame-shaped and holds the peripheral edge of the filter 3. A hole is provided in the center of the bracket 3a, and the center of the filter 3 is exposed inside the hole. Therefore, gas G can be introduced into the frame 2 through the filter 3.

[0022] The filter 3 prevents dust and other particles outside the frame 2 from being sucked into the frame 2. The filter 3 is provided, for example, to remove dust particles large enough to be visible to the naked eye. The filter 3 can be, for example, a plain-woven stainless steel wire mesh (wire diameter φ0.1 mm, 100 mesh).

[0023] The fan 4 is connected to a hole 2b provided at the exhaust side end of the frame 2. As shown in FIGS. 1 to 3, the fan 4 can be detachably provided at the exhaust side end of the frame 2. The fan 4 exhausts gas G inside the frame 2 to the outside of the frame 2 through the hole 2b. This allows a flow of gas G to be formed inside the frame 2, flowing from the filter 3 side toward the fan 4 side. The fan 4 can be, for example, a sirocco fan.

[0024] The photocatalytic filter 5 is detachably provided on the bracket 2c inside the frame 2. For example, the photocatalytic filter 5 can be attached to the bracket 2c using a fastening member such as a screw.

[0025] The photocatalytic filter 5 includes, for example, a sheet and a plurality of photocatalysts. The sheet is, for example, a woven fabric containing a plurality of linear bodies.

[0026] Generally, a sheet is formed using a plurality of glass fibers. Sheets formed from a plurality of glass fibers have low rigidity, and therefore require a frame-shaped member to hold the periphery of the sheet. Furthermore, in recent years, there has been a demand for improved processing capacity, and the flow rate and flow velocity of the gas G passing through the sheet tend to increase. Therefore, in order to suppress deformation of the central region of the sheet, a crosspiece or the like may be provided on the frame-shaped member that holds the periphery of the sheet. If a frame-shaped member or crosspiece or the like is provided, an area will be created where the light emitted from the light-emitting element 6b does not enter and the gas G cannot flow through, making it difficult to improve processing capacity.

[0027] Therefore, the photocatalytic filter 5 has a sheet formed by weaving metal-containing filaments. The material of the filaments is, for example, stainless steel, nickel, Monel, phosphor bronze, titanium, copper, copper alloy, silver, silver alloy, etc. The diameter (thickness) of the filaments is, for example, 0.016 mm or more and 2.0 mm or less. The number of gaps per inch (25.4 mm), i.e., the number of meshes, can be, for example, 500 or less.

[0028] By forming a sheet using such linear bodies, the rigidity of the sheet can be increased, thereby increasing the flow rate and flow velocity of the gas G passing through the sheet. Furthermore, there is no need to provide frame-shaped members or crosspieces for reinforcement. This allows for an improvement in the processing capacity of the gas purification device 1.

[0029] The multiple photocatalysts are supported on a sheet. The multiple photocatalysts are, for example, granular. The type of photocatalyst can be appropriately selected depending on the application of the gas purification device 1, the substances contained in the gas G, and the like. For example, the photocatalyst can be an ultraviolet ray responsive photocatalyst or a visible light responsive photocatalyst. The ultraviolet ray responsive photocatalyst includes, for example, titanium oxide. The visible light responsive photocatalyst includes, for example, tungsten oxide, titanium oxide doped with nitrogen, or titanium oxide ion-implanted with a different metal. The photocatalytic filter 5 can be formed, for example, by immersing a sheet in an emulsion solution containing an aqueous solution and a plurality of photocatalysts, and then removing the sheet and drying it.

[0030] 4 is a schematic plan view illustrating the light source 6 and the guard 7. FIG 4 is a schematic cross-sectional view of the gas purification device 1 in FIG 1 taken along line BB. 3 and 4, the light source 6 is detachably provided on a bracket 2e inside the frame 2. For example, the light source 6 can be attached to the bracket 2e using a fastening member such as a screw.

[0031] At least one light source 6 can be provided. The gas purification device 1 illustrated in Fig. 3 and Fig. 4 has two light sources 6 arranged side by side and spaced apart from each other. The light source 6 faces the photocatalytic filter 5. The light source 6 is electrically connected to a lighting circuit, a power source, or the like provided outside the gas purification device 1 via a connector 2g.

[0032] The light source 6 includes, for example, a substrate 6a, a light emitting element 6b, and a light emitting element 6c. The substrate 6a is plate-shaped. The substrate 6a is disposed in the flow path of the gas G, facing the photocatalytic filter 5. Therefore, the presence of the substrate 6a may hinder the flow of the gas G. In this case, multiple holes penetrating the substrate 6a in the thickness direction may be provided. However, if the size of the holes is small, the pressure loss increases, hindering the flow of the gas G. If the size of the holes is large, restrictions will be imposed on the arrangement and number of the light-emitting elements 6b and 6c and the wiring patterns.

[0033] 3, the width of the substrate 6a is made smaller than the width of the photocatalytic filter 5. In this case, if the "width of the substrate 6a (mm) / width of the photocatalytic filter 5 (mm)" is smaller than 0.5, it is easy to ensure an appropriate flow of the gas G.

[0034] There are no particular limitations on the material or structure of the substrate 6a. For example, the substrate 6a can be made of inorganic materials (ceramics) such as aluminum oxide or aluminum nitride, or organic materials such as paper phenol or glass epoxy. The substrate 6a may also be a metal core substrate in which the surface of a metal plate is covered with an insulating material.

[0035] When the light emitting elements 6b and 6c generate a large amount of heat, it is preferable to form the substrate 6a using a material with high thermal conductivity from the viewpoint of heat dissipation. Examples of materials with high thermal conductivity include ceramics such as aluminum oxide and aluminum nitride, and metal core substrates. The substrate 6a may have a single-layer structure or a multi-layer structure.

[0036] The light-emitting elements 6b and 6c are provided on the surface of the substrate 6a facing the photocatalytic filter 5. The light-emitting elements 6b and 6c are electrically connected, for example, to a wiring pattern provided on the surface of the substrate 6a. The type of the light-emitting elements 6b and 6c is not particularly limited. The light-emitting elements 6b and 6c can be, for example, surface-mounted light-emitting elements such as PLCC (Plastic Leaded Chip Carrier) type. The light-emitting elements 6b and 6c can also be, for example, light-emitting elements having leads such as a bullet type. The light-emitting elements 6b and 6c can also be, for example, chip-type light-emitting elements. The chip-type light-emitting elements can be mounted on the wiring pattern using, for example, COB (Chip On Board). The light-emitting elements 6b and 6c illustrated in FIGS. 3 and 4 are surface-mounted light-emitting elements.

[0037] The light-emitting element 6b is provided to excite the photocatalyst supported on the photocatalytic filter 5. In this case, if the material or composition of the photocatalyst changes, the absorption wavelength range of the photocatalyst changes. Therefore, a light-emitting element 6b that emits light of an appropriate wavelength is selected depending on the absorption wavelength range of the photocatalyst. For example, if the photocatalyst is an ultraviolet-responsive photocatalyst containing titanium oxide or the like, the light-emitting element 6b can be a light-emitting diode or laser diode that emits ultraviolet light with a peak wavelength of, for example, 315 nm or more and 420 nm or less. Furthermore, if the photocatalyst is a visible-light-responsive photocatalyst such as tungsten oxide, the light-emitting element 6b can be a light-emitting diode, laser diode, organic light-emitting diode, or the like that emits visible light with a peak wavelength of, for example, 405 nm or more and 600 nm or less.

[0038] In recent years, in addition to removing VOCs and the like, there has been a demand for sterilization and inactivation of bacteria, viruses, and the like. Therefore, the light-emitting element 6c is provided to sterilize and inactivate bacteria, viruses, and the like contained in the gas G flowing inside the frame 2, and bacteria, viruses, and the like attached to the photocatalytic filter 5 or the inner wall of the frame 2. In this case, the shorter the peak wavelength of the ultraviolet light, the stronger the sterilizing effect. Therefore, the peak wavelength of the light-emitting element 6c is shorter than that of the light-emitting element 6b. The light-emitting element 6c can be a light-emitting diode or a laser diode that emits ultraviolet light with a peak wavelength of, for example, 270 nm or more and 300 nm or less.

[0039] At least one light-emitting element 6b can be provided for one substrate 6a. Although the light-emitting element 6c can be omitted, providing the light-emitting element 6c makes it easier to sterilize and inactivate bacteria, viruses, etc. In the case of the light source 6 illustrated in FIG. 4, two light-emitting elements 6b and one light-emitting element 6c are provided for one substrate 6a. The light-emitting elements 6b and 6c can be connected in series or in parallel.

[0040] Here, silicone resin is used as a sealant for the light-emitting elements 6b and 6c. Silicone resin has high resistance to ultraviolet light, but the ultraviolet light irradiated from the light-emitting elements 6b and 6c may partially decompose the silicone resin. In this case, the shorter the peak wavelength of the irradiated ultraviolet light, the more likely the silicone resin will decompose. In addition, heat is generated when the light-emitting elements 6b and 6c irradiate ultraviolet light. When the silicone resin is heated by the generated heat, the silicone resin is more likely to decompose.

[0041] When the silicone resin is decomposed, gas containing silicone resin components is released from the light emitting elements 6b and 6c. The silicone resin components released from the light emitting elements 6b and 6c are carried by the flow of gas G flowing inside the frame 2 and are discharged to the outside of the frame 2.

[0042] In this case, if the light source 6 is provided upstream of the flow of gas G flowing inside the frame 2 and the photocatalytic filter 5 is provided downstream of the light source 6, the silicone resin components contained in the gas G will easily adhere to the photocatalyst of the photocatalytic filter 5. If the silicone resin components adhere to the photocatalyst, it will be difficult for ultraviolet light to enter the photocatalyst, or the gas G to be treated will be less likely to come into contact with the photocatalyst. As a result, there is a risk that the functions of the gas purification device 1 (gas purification, sterilization and inactivation of bacteria, viruses, etc.) will deteriorate over time.

[0043] Therefore, in the gas purification device 1, a photocatalytic filter 5 is provided upstream of the flow of the gas G flowing inside the frame 2, and a light source 6 is provided downstream of the bracket 2c.

[0044] In this way, even if silicone resin components are released from the light-emitting elements 6b and 6c, the flow of gas G prevents the silicone resin components from reaching the photocatalytic filter 5. Therefore, it is possible to prevent the performance of the gas purification device 1 from deteriorating over time.

[0045] Furthermore, as mentioned above, the peak wavelength of the ultraviolet light emitted from the light-emitting element 6c is shorter than the peak wavelength of the ultraviolet light emitted from the light-emitting element 6b. The decomposition of the silicone resin described above is accelerated as the peak wavelength of the irradiated ultraviolet light becomes shorter. Therefore, the silicone resin component released from the light-emitting element 6c becomes greater than the silicone resin component released from the light-emitting element 6b. Furthermore, the flow of the gas G is affected by the inner wall of the frame 2. For example, the flow rate of the gas G is greater near the center of the frame 2 than near the inner wall of the frame 2. For example, the flow of the gas G is smoother near the center of the frame 2 than near the inner wall of the frame 2.

[0046] 4, if light-emitting element 6c is provided closer to the center of substrate 6a than light-emitting element 6b, even if a large amount of silicone resin components are released from light-emitting element 6c, the released silicone resin components can be easily carried by gas G and discharged to the outside of frame 2. As a result, deterioration of the functionality of gas purifying device 1 over time can be more effectively prevented.

[0047] As described above, the gas purification device 1 is provided with a filter 3 to prevent dust from entering. Furthermore, a photocatalytic filter 5 is provided upstream of the light source 6 in the flow direction of the gas G. This prevents dust and silicone resin components released from the light-emitting elements 6b and 6c from adhering to the photocatalytic filter 5. However, even in this configuration, it is difficult to completely prevent dust and silicone resin components from adhering to the photocatalytic filter 5. Therefore, maintenance (e.g., cleaning or washing) of the photocatalytic filter 5 needs to be performed periodically or as needed.

[0048] When performing maintenance on the photocatalytic filter 5, a worker removes the photocatalytic filter 5 from the bracket 2c or attaches the photocatalytic filter 5 to the bracket 2c. However, a light source 6 having light-emitting elements 6b and 6c is provided near the photocatalytic filter 5. Therefore, when a worker attaches or detaches the photocatalytic filter 5, there is a risk that the worker may come into contact with the emission parts of the light-emitting elements 6b and 6c that emit ultraviolet light or the like (for example, the emission surfaces of the light-emitting elements 6b and 6c).

[0049] If an operator touches the ultraviolet ray emitting parts of the light-emitting elements 6b and 6c, the oils on their hands that adhere to the emitting parts may cause deterioration or contamination of the emitting parts, which may reduce the illuminance of the ultraviolet ray, etc. emitted from the light-emitting elements 6b and 6c. If the illuminance of the ultraviolet ray, etc. emitted from the light-emitting elements 6b and 6c is reduced, the performance of the gas purification device 1 may be reduced.

[0050] Furthermore, the temperatures of the light-emitting elements 6b and 6c are high immediately after the operation of the gas purification device 1 is stopped. Therefore, when performing maintenance on the photocatalytic filter 5, it is preferable to make it difficult for workers to touch the light-emitting elements 6b and 6c, which are at high temperatures.

[0051] Therefore, as shown in Fig. 3, a guard 7 is provided inside the frame 2 between the photocatalytic filter 5 and the light source 6. The guard 7 is provided near the light source 6. As shown in Figs. 3 and 4, the guard 7 is plate-shaped and is detachably attached to the bracket 2d. For example, the guard 7 can be detachably attached to the bracket 2d using a fastening member such as a screw.

[0052] As shown in FIG. 4, the guard 7 has a hole 7a through which the gas G flows. The gas G flowing inside the frame 2 flows through the hole 7a toward the downstream side of the guard 7 (toward the light source 6). Ultraviolet rays emitted from the light-emitting elements 6b and 6c are irradiated through the hole 7a toward the upstream side of the guard 7 (toward the photocatalytic filter 5). Furthermore, crosspieces 7b and 7c are provided inside the hole 7a. The crosspieces 7b and 7c are, for example, strip-shaped and extend in one direction. For example, a pair of crosspieces 7b can be provided for one light-emitting element 6b. When viewed from a direction perpendicular to the surface of the substrate 6a on which the light-emitting element 6b is provided, the pair of crosspieces 7b can be provided with the light-emitting element 6b sandwiched between them. For example, a pair of crosspieces 7c can be provided for one light-emitting element 6c. When viewed from a direction perpendicular to the surface of the substrate 6a on which the light-emitting element 6c is provided, the pair of crosspieces 7c can be provided with the light-emitting element 6c sandwiched between them.

[0053] As shown in Fig. 4, when a plurality of light-emitting elements 6b are aligned in one direction, a pair of crosspieces 7b can be provided for the plurality of light-emitting elements 6b aligned in one direction. For example, a pair of crosspieces 7b can be provided to sandwich the plurality of light-emitting elements 6b aligned in one direction. When a plurality of light-emitting elements 6c are aligned in one direction, a pair of crosspieces 7c can be provided for the plurality of light-emitting elements 6c aligned in one direction. For example, a pair of crosspieces 7c can be provided to sandwich the plurality of light-emitting elements 6c aligned in one direction.

[0054] In addition, when the light-emitting elements 6b and the light-emitting elements 6c are aligned in one direction, a pair of bars can be provided for the light-emitting elements 6b and the light-emitting elements 6c aligned in one direction. That is, the pair of bars can be used for multiple light-emitting elements 6b or multiple light-emitting elements 6c aligned in one direction, or for both the light-emitting elements 6b and the light-emitting elements 6c aligned in one direction.

[0055] 4, if the gap between a pair of crosspieces 7b is Wb (mm), making Wb (mm) too large will make it easier for the worker's fingers to reach the emitting portion of the light-emitting element 6b that emits ultraviolet rays, etc. On the other hand, making Wb (mm) too small will make it easier for the ultraviolet rays, etc. that are irradiated to the front side of the light-emitting element 6b to be blocked.

[0056] Therefore, if the planar dimension of the light-emitting element 6b in the direction parallel to the direction in which the pair of crosspieces 7b are arranged is Lb (mm), it is preferable to set "Lb (mm) ≦ Wb (mm) ≦ 8 (mm)." This makes it difficult for an operator's fingers to reach the emitting portion of the light-emitting element 6b from which ultraviolet rays and the like are emitted, and also makes it difficult for the ultraviolet rays and the like irradiated to the front side of the light-emitting element 6b to be blocked.

[0057] Furthermore, if the gap between a pair of crosspieces 7c is Wc (mm), making Wc (mm) too large will make it easier for the worker's fingers to reach the ultraviolet emitting portion of the light-emitting element 6c, whereas making Wc (mm) too small will make it easier for the ultraviolet ray irradiated to the front side of the light-emitting element 6c to be blocked.

[0058] Therefore, if the planar dimension of the light-emitting element 6c in the direction parallel to the direction in which the pair of crosspieces 7c are arranged is Lc (mm), it is preferable to satisfy "Lc (mm) ≦ Wc (mm) ≦ 8 (mm)." This makes it difficult for an operator's fingers to reach the ultraviolet emitting portion of the light-emitting element 6c, and also makes it difficult for the ultraviolet ray irradiated to the front side of the light-emitting element 6c to be blocked.

[0059] It should be noted that Wc (mm) may be different from or the same as Wb (mm). When Wb (mm) and Wc (mm) are made the same, Wb (mm) and Wc (mm) should be larger than the larger of Lb (mm) and Lc (mm). In the example shown in Figure 4, Wb (mm) and Wc (mm) are the same and Wb (mm) and Wc (mm) are larger than Lc (mm).

[0060] In this case, if the width dimension Wab (mm) of crosspiece 7b is made too small, the worker's fingers or the like will easily reach light-emitting element 6b from the side of crosspiece 7b. If the width dimension Wbc (mm) of crosspiece 7c is made too small, the worker's fingers or the like will easily reach light-emitting element 6c from the side of crosspiece 7c.

[0061] FIG. 5 is a table illustrating the relationship between the width of the crosspiece and the degree of difficulty when the worker's fingers reach the light-emitting elements. In FIG. 5, the width of the crosspiece is determined based on the area S1 (mm 2 ) and the area S2 (mm 2 ) was used to evaluate the degree of difficulty. As shown in Figure 4, area C is the area where the guard 7 overlaps with the substrate 6a when viewed from a direction perpendicular to the surface of the substrate 6a on which the light-emitting elements 6b and 6c are provided. The difficulty of the worker's fingers reaching the light-emitting elements was evaluated using the test finger specified in JPFA-SP-S:2014. Furthermore, Wb (mm) and Wc (mm) were set to 8 mm, and Wab (mm) and Wbc (mm) were set to the same value.

[0062] As can be seen in Figure 5, "(S1(mm 2 ) / S2(mm 2 ))×100≧3%”, it is possible to prevent the fingers of an operator from reaching the light emitting elements 6b and 6c from the sides of the crosspieces 7b and 7c.

[0063] Furthermore, if Wab (mm) and Wbc (mm) are made too large, ultraviolet rays and the like irradiated to the front side of the light emitting elements 6b and 6c are likely to be blocked, which may result in a decrease in the performance of the gas purification device 1.

[0064] FIG. 6 is a table illustrating the relationship between the width of the crosspiece and the performance of the gas purification device 1. As shown in FIG. In Figure 6, as in Figure 5, the width of the crosspiece is S1 (mm 2 ) / S2(mm 2 The performance of the gas purifying device was evaluated by the concentration of acetaldehyde 90 minutes after the start of the gas purifying device 1. Figure 6 shows the performance of the gas purifying device 1 in a 1 m 3 6 is a case where the gas purifying device 1 is placed in an atmosphere with an acetaldehyde concentration of 10 ppm. The acetaldehyde concentration in Fig. 6 is a relative value where the concentration at the time of start-up of the gas purifying device 1 is set to 100%.

[0065] As can be seen in Figure 6, "(S1(mm 2 ) / S2(mm 2 )) × 100≦18%" will ensure sufficient removal of acetaldehyde.

[0066] That is, as can be seen from Figures 5 and 6, "3% ≤ (S1 (mm 2 ) / S2(mm 2 ))×100≦18%”, it is possible to prevent workers from coming into contact with the light source, and to provide a gas purification device 1 with sufficient performance.

[0067] The above are the conditions for the guard 7 in the direction parallel to the surface of the substrate 6a on which the light emitting elements 6b and 6c are provided. In the following, the conditions for the guard 7 in the direction perpendicular to the surface of the substrate 6a on which the light emitting elements 6b and 6c are provided will be described.

[0068] FIG. 7 is a schematic side view illustrating the light source 6 and the guard 7 when viewed from a direction parallel to the surface of the substrate 6a on which the light emitting elements 6b and 6c are provided. As shown in FIG. 7, the distance between the emission surface of the light emitting element 6b (6c) for ultraviolet rays and the like and the surface of the guard 7 on the substrate 6a side is defined as d (mm). If the distance d (mm) is set too small, the worker's fingers or the like can easily reach the emission surface of the light-emitting element 6b (6c) for ultraviolet rays or the like through the gap between the pair of crosspieces 7b (7c). On the other hand, if the distance d (mm) is set too large, the worker's fingers or the like can easily reach the light-emitting element 6b (6c) from the side of the crosspiece 7b (7c).

[0069] Figure 8 is a table illustrating the relationship between the distance d (mm) and the difficulty of the worker's finger reaching the light-emitting element. As in the case of Figure 5, the difficulty of the worker's finger reaching the light-emitting element was evaluated using the test finger specified in JPFA-SP-S:2014.

[0070] As can be seen from Figure 8, if "4mm≦d(mm)≦8mm" is set, it is possible to prevent the worker's fingers, etc. from reaching the light-emitting element 6b (6c) through the gap between a pair of crosspieces 7b (7c) and from the side of the crosspiece 7b (7c).

[0071] FIG. 9 is a schematic cross-sectional view illustrating the light emitting element 6b (6c) and a pair of crosspieces 7b (7c) when viewed from a direction parallel to the surface of the substrate 6a on which the light emitting elements 6b and 6c are provided. As shown in FIG. 9, the area of ​​a triangle formed by a line segment connecting the center of the light emitting surface of the light emitting element 6b (6c) and the edge of one crosspiece 7b (7c) on the side of the other crosspiece 7b (7c), a line segment connecting the center of the light emitting surface of the light emitting element 6b (6c) and the edge of the other crosspiece 7b (7c) on the side of one crosspiece 7b (7c), and a line segment connecting the edge of one crosspiece 7b (7c) on the side of the other crosspiece 7b (7c) and the edge of the other crosspiece 7b (7c) on the side of one crosspiece 7b (7c) is defined as S3 (mm 2 ) S3(mm 2 If S3 (mm) is too small, the operator's fingers or the like can easily reach the emission surface of the light emitting element 6b (6c) through the gap between the pair of bars 7b (7c). 2 If the distance ) is too large, the fingers of an operator may easily reach the light emitting element 6b (6c) from the side of the crosspiece 7b (7c).

[0072] Figure 10 shows the area S3 (mm 210 is a table illustrating the relationship between the degree of difficulty when the worker's finger reaches the light-emitting element and the performance of the gas purification device 1. As can be seen from Figure 10, 2 ≦S3(mm 2 )≦32mm 2 This can prevent the fingers of an operator from reaching the light-emitting element 6b (6c) through the gap between the pair of crosspieces 7b (7c) and from the side of the crosspiece 7b (7c). Also, the gas purification device 1 can have sufficient performance.

[0073] Although several embodiments of the present invention have been described above, these embodiments are presented by way of example only and are not intended to limit the scope of the invention. These novel embodiments can be embodied in various other forms, and various omissions, substitutions, modifications, etc. can be made without departing from the spirit of the invention. These embodiments and their modifications are included within the scope and spirit of the invention, as well as within the scope of the invention and its equivalents as set forth in the claims. Furthermore, the above-described embodiments can be implemented in combination with each other. [Explanation of symbols]

[0074] 1 gas purifier, 2 frame, 3 filter, 4 fan, 5 photocatalytic filter, 6 light source, 6a substrate, 6b light emitting element, 6c light emitting element, 7 guard, 7a hole, 7b crosspiece, 7c crosspiece, G gas

Claims

[Claim 1] a frame having a space therein through which a gas to be treated flows; a photocatalytic filter provided inside the frame and having a photocatalyst; A substrate provided inside the frame and facing the photocatalytic filter; a light source having a light emitting element provided on a surface facing the photocatalytic filter; A plate-shaped member is provided inside the frame and between the photocatalytic filter and the light source. a hole through which the gas flows, and at least a pair of bars provided inside the hole; a guard having Equipped with When viewed from a direction perpendicular to a surface of the substrate on which the light emitting element is provided, the pair of crosspieces are provided on either side of the light emitting element, When viewed from a direction perpendicular to the surface of the substrate on which the light emitting element is provided, , the area of ​​the region overlapping with the substrate is S1 (mm ２ ), and the area of ​​the substrate is S2 (mm ２ ) When 3%≦(S1(mm ２ ) / S2(mm ２ ))×100≦18% Satisfies the formula, When viewed from a direction parallel to the surface of the substrate on which the light-emitting element is provided, the distance between the light-emitting surface of the light-emitting element and the surface of the guard on the substrate side is d (mm), 4mm≦d(mm)≦8mm Satisfies the formula, When viewed from a direction parallel to the surface of the substrate on which the light-emitting elements are provided, the area of ​​a triangle formed by a line segment connecting the center of the light-emitting surface of the light-emitting element and the edge of one of the crosspieces on the other crosspiece side, a line segment connecting the center of the light-emitting surface of the light-emitting element and the edge of the other crosspiece on the one crosspiece side, and a line segment connecting the edge of the one crosspiece on the other crosspiece side and the edge of the other crosspiece on the one crosspiece side is S3 (mm 2 ). 8mm2≦S3(mm2)≦32mm A gas purification device that satisfies the following formula.

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