JP2021007676A - Fluid purification structure using photocatalyst, and photocatalyst unit used for the fluid purification structure - Google Patents

Abstract

To provide a fluid purification structure using a photocatalyst capable of efficiently radiating ultraviolet light to the photocatalyst for improving fluid purification action by the photocatalyst, and at the same time, capable of being reduced in size and thickness as a photocatalyst unit formed of a photocatalyst filter and a light radiation part and having high design freedom degree of a channel structure, and a photocatalyst unit used for the same structure.SOLUTION: A fluid purification structure comprises: a photocatalyst filter 3 formed of a wavy member in which crest parts 31 and trough parts 32 are alternately formed; a light radiation part 5 provided on one or both of one end side and the other end side of a direction where the crest parts 31 and the trough parts 32 of the photocatalyst filter 3 extend; a fluid supply path 70 for supplying a fluid to one surface out of front and rear surfaces of the photocatalyst filter 3; a fluid discharge path 71 for discharging a fluid discharged from the other surface out of the front and rear surfaces of the photocatalyst filter 3; and dust collecting filters 4A, 4B internally provided in the fluid supply path 70 and the fluid discharge path 71, and provided to face on the front and rear surfaces of the photocatalyst filter 3.SELECTED DRAWING: Figure 1

Description

The present invention relates to a fluid cleaning structure for purifying a fluid such as air with a photocatalyst, and a photocatalyst unit used for the fluid cleaning structure.

Conventionally, an air purifier having an air purifying structure for decomposing a virus or the like using a photocatalyst has been proposed (see, for example, Patent Documents 1 and 2). In these conventional air purification structures using a photocatalyst, a photocatalyst such as titanium oxide is supported on one of the front and back surfaces of a plate-shaped base material (filter base material) having a large number of air passage holes penetrating in the thickness direction. A photocatalyst filter is configured, and a photocatalyst unit in which a plurality of ultraviolet lamps are arranged at intervals facing the photocatalyst-supporting surface of the photocatalyst filter is provided, and air is blown into the unit from one side of the front and back in the filter thickness direction. It is a structure that supplies air and allows air to flow through the air passage holes of the filter, the photocatalyst layer, and the gaps between the plurality of ultraviolet lamps. Then, in the process of passing through the photocatalyst layer, harmful substances in the air are decomposed and removed by the photocatalyst excited by ultraviolet rays.

In such an air purification structure using a conventional photocatalyst unit, since the photocatalyst filter and the ultraviolet lamp are arranged so as to face each other in the filter thickness direction, the thickness of the unit becomes large, and there is a limit to thinness and compactness. .. In addition, since the structure is such that air flows between the ultraviolet lamps, there is a limit to increasing the number of ultraviolet lamps that resist the air, and the amount of ultraviolet rays irradiated to the photocatalyst filter and the improvement of irradiation efficiency are also constant. There is a limit. For example, even if the photocatalyst is supported to the inner surface of the air passage hole of the plate-shaped base material, it is difficult to efficiently irradiate the ultraviolet rays to the inner surface.

On the other hand, a photocatalyst filter in which a plurality of plate-shaped portions on which photocatalysts are supported on the front and back surfaces are arranged so that the front and back surfaces of adjacent plate-shaped portions face each other with a gap, and the gap is used as an air flow passage. At a position facing at least one end face of the end face of each plate-shaped portion of the photocatalyst filter, the end face of the air inlet side to the gap and the end face of the air outlet side from the gap. Therefore, an ultraviolet irradiation portion that irradiates ultraviolet rays toward the gap is arranged at a position separated from the end face by a predetermined distance, and is substantially parallel to the end face between the ultraviolet irradiation portion and the end face of each plate-shaped portion. Air that takes in air from the side and supplies it to the flow passage formed by the gap between the plate-shaped portions, or air discharged from the flow passage to the side substantially parallel to the end face. An air purification structure forming an discharge channel has been proposed (see Patent Document 3).

In such an air purifying structure, an ultraviolet irradiation portion is arranged at a position separated from the end surface on the inlet side or the outlet side of the air among the end faces of each plate-shaped portion of the photocatalyst filter by a predetermined distance, and the ultraviolet irradiation portion and each plate are arranged. An ultraviolet lamp is formed between the end face of the shaped portion and an air supply path that takes in air from a side substantially parallel to the end face or an air discharge path that discharges air to a side substantially parallel to the end face. Since air is not supplied or discharged through the gaps between the two, the degree of freedom in designing the ultraviolet irradiation part is significantly improved, and the photocatalyst of each plate-shaped part efficiently irradiates ultraviolet rays to significantly improve the air cleaning action of the photocatalyst. It becomes easy to make it.

However, since such an air purifying structure is a structure in which air is supplied or discharged in an L shape from the side between the ultraviolet irradiation unit and the photocatalyst filter, the form of air supply / discharge (flow path). In addition to being limited, the unit as a whole becomes large, and it cannot be adopted when it is desired to pass the fluid straight in the filter thickness direction instead of such an L shape, and the flow path structure is limited. There was a problem.

Utility Model Registration No. 3150894 Special Table 2011-114894 JP-A-2017-148484

Therefore, what the present invention attempts to solve in view of the above situation is that the photocatalyst can be efficiently irradiated with ultraviolet rays to improve the fluid cleaning action of the photocatalyst, and at the same time, the photocatalyst unit including the photocatalyst filter and the light irradiation unit is formed. The present invention is to provide a photocatalyst-based fluid cleaning structure, which can be thinned and miniaturized and has a high degree of freedom in designing a flow path structure, and a photocatalyst unit used for the structure.

The present invention includes the following inventions.
(1) It is composed of a corrugated member in which a plurality of peaks and valleys are alternately formed, and a fluid passage hole for passing a fluid is formed in one or both of the top of the peak and the bottom of the valley. , A photocatalyst filter in which a photocatalyst is supported on the front and back surfaces, and one or both of one end side and the other end side of the photocatalyst filter in the direction in which the peaks and valleys extend, and the peaks and valleys are provided. A light irradiation unit that irradiates ultraviolet rays or visible light toward the inward extending direction, and a photocatalyst filter provided on one side of the front and back surfaces of the photocatalyst filter to supply a fluid toward the one surface. The fluid supply path is provided on the other side of the front and back surfaces of the photocatalyst filter, is supplied from the fluid supply path, passes through the fluid passage hole, and discharges the fluid discharged from the other surface. A photocatalyst including a fluid discharge path, and a dust collection filter which is provided in one or both of the fluid supply path and the fluid discharge path and is provided so as to face the one surface or the other surface. Fluid cleaning structure by.

(2) The fluid cleaning structure according to (1), wherein the one surface of the photocatalyst filter in the dust collection filter or the surface facing the other surface is a white filter surface.

(3) The fluid cleaning structure according to (2), wherein a photocatalyst is supported on the white filter surface.

(4) The fluid cleaning structure according to any one of (1) to (3), wherein the dust collecting filter includes a dark-colored filter layer containing activated carbon.

(5) A photocatalyst unit used for the fluid cleaning structure according to any one of (1) to (4), comprising the photocatalyst filter, the light irradiation unit, and the dust collection filter.

(6) A colored light shielding wall that covers the end faces of the photocatalyst filter excluding the front and back surfaces and the end faces of the dust collecting filter adjacent to the end faces and constitutes the flow path walls of the fluid supply path and the fluid discharge path. The photocatalyst unit according to (5) provided.

(7) The fluid passage hole of the photocatalyst filter is a through groove long in the direction in which the mountain portion and the valley portion extend, and a pair of opening edges facing each other along the longitudinal direction of the through groove are formed. The photocatalyst unit according to (5) or (6), wherein the photocatalyst unit is cut up to form the through groove and is provided with standing pieces that stand up on the convex side of the mountain portion or the valley portion, respectively.

According to the present invention as described above, on both sides of the filter of the photocatalytic filter having a corrugated shape and a sufficient surface area, inward along the extending direction of the peak or valley from the light irradiation portion provided on one end side or both end sides. By passing the fluid in the thickness direction of the filter through the fluid supply path and the fluid discharge path while irradiating with light, harmful substances and odors in the fluid are supported on the front and back surfaces of the filter and the inner surface of the fluid passage hole. It can be efficiently decomposed and removed by a photocatalyst.

Further, the light irradiation unit is not provided at a position facing the filter surface as in the conventional case, but is provided on one or both of one end side and the other end side in the direction in which the peak and valley portions of the photocatalyst filter extend. Since it is configured to irradiate ultraviolet rays or visible light toward the inside where the peaks and valleys extend from that position, the fluid is filtered without being disturbed by the light irradiation part. It is possible to circulate straight in the direction, the degree of freedom in flow path design is improved, and the unit including the filter and the light irradiation unit can be remarkably made thinner and more compact.

Further, in the dust collection filter, if the one surface or the surface of the photocatalyst filter facing the other surface is a white filter surface, the light emitted from the light irradiation unit is reflected and the photocatalyst is used. Light can be applied to each part of the filter, and the above-mentioned decomposition / removal action of the photocatalyst can be further enhanced.

Further, in the case where the photocatalyst is supported on the white filter surface, the filter surface also has a photocatalyst function, and harmful substances and foul odors adhering to the dust collecting filter can be decomposed and removed by the photocatalyst.

Further, when the dust collecting filter includes a dark-colored filter layer containing activated carbon, it is possible to prevent light from leaking to the outside from the light irradiation unit.

Further, a colored light shielding wall is provided which covers the end faces of the photocatalyst filter excluding the front and back surfaces and the end faces of the dust collecting filter adjacent to the end faces and constitutes the flow path walls of the fluid supply path and the fluid discharge path. In the case of the above, each end surface of the photocatalyst unit can be surrounded by the flow path wall, and leakage of light to the outside can be prevented more reliably.

The perspective view which shows the photocatalyst unit which concerns on the typical embodiment of this invention. Similarly, a vertical sectional view taken along the line AA of FIG. Similarly, a cross-sectional view taken along the line BB in FIG. An exploded perspective view showing a photocatalyst filter, a light irradiation unit, and a dust collection filter that also constitute a photocatalyst unit. The perspective view which also shows the main part of the photocatalyst filter. Similarly, a cross-sectional view of a main part of the photocatalyst filter. Explanatory drawing which shows the modification which made the photocatalyst filter a plurality of divisions. The exploded perspective view which shows the other embodiment of the photocatalyst unit of this invention. The vertical sectional view which also shows the photocatalyst unit of another embodiment. Explanatory drawing which shows still another embodiment of the photocatalyst unit of this invention.

Next, an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

As shown in FIGS. 1 to 3, the photocatalyst-based fluid cleaning structure 1 of the present invention includes a photocatalyst filter 3 composed of corrugated members in which a plurality of peaks 31 and valleys 32 are alternately formed, and a photocatalyst filter 3. A fluid is supplied to one of the front and back surfaces of the photocatalyst filter 3 and the light irradiation unit 5 provided on one or both of one end side and the other end side in the direction in which the peak portion 31 and the valley portion 32 extend. The fluid supply path 70, the fluid discharge path 71 for discharging the fluid discharged from the other surface of the front and back surfaces of the photocatalyst filter 3, and the front and back surfaces of the photocatalyst filter 3 provided in the fluid supply path 70 and the fluid discharge path 71. It is provided with dust collecting filters 4A and 4B provided facing the surface. In the present invention, the fluid includes a liquid as well as air and other gases.

According to this example, both sides of the photocatalyst filter 3 are irradiated with light inward along the extending direction of the mountain portion 31 or the valley portion 32 from the light irradiation unit 5, and the light is emitted through the fluid supply path 70 and the fluid discharge path 71. The fluid can be passed in the thickness direction of the filter 3, and harmful substances and odors in the fluid can be efficiently decomposed and removed by the photocatalyst supported on the front and back surfaces of the filter and the inner surface of the fluid passage hole.

As shown in FIGS. 4 to 6, the photocatalyst filter 3 is composed of a corrugated member in which a plurality of mountain portions 31 and valley portions 32 are alternately formed, and one of the top portion of the peak portion 31 and the bottom portion of the valley portion 32 or A fluid passage hole 33 for passing the fluid is formed on both sides, and a photocatalyst is supported on the front and back surfaces. In this example, by pressing the metal plate, all the tops of the plurality of peaks 31 and all the bottoms of the plurality of valleys 32 are processed into a flat corrugated plate shape located on the same plane. A photocatalyst layer is coated on the surface. It may be made of a material other than metal.

Further, the photocatalyst filter 3 of this example has a corrugated shape in which the peaks 31 and valleys 32 are angular and has an uneven shape as a whole, but the peaks and valleys are gently continuous curved surfaces. Of course, it may be configured in a wavy shape. In the "mountain part" and "valley part", one surface of the uneven surface of the concave-convex shape (corrugated shape) is the upper surface and the other surface is the lower surface. The part that has been removed is called "Tanibe". As the material of the member, various metal materials such as aluminum and stainless steel can be used, but the material is not limited thereto.

The fluid passage hole 33 does not have to be provided in all the peaks 31 or all the valleys 32, and may be formed by skipping, for example, one or more peaks 31 or valleys 32. The dimensions, number, arrangement, etc. of the fluid passage holes 33 can also be appropriately determined so as to obtain suitable shape retention according to the application, size, and the like of the present device. In this example, for one mountain portion 31 or valley portion 32, two fluid passage holes 33 formed of through grooves long in the direction in which the peak portion 31 or valley portion 32 extends are continuously provided at intervals. The structure is such that the shape retention can be maintained as a whole by the bridging portion 34 (the remaining portion between the fluid passage holes 33 in the mountain portion 31 or the valley portion 32) formed between the two. However, the length and spacing of the fluid passage holes 33 can be appropriately determined according to the plate thickness, other dimensions, and the required degree of shape retention. For example, three or more fluid passage holes 33 are continuously provided in the row direction. It may be composed of only one.

A pair of opposite opening edges along the longitudinal direction of the fluid passage hole 33 stand on the convex side of the mountain portion 31 or the valley portion 32 cut up to form the fluid passage hole 33. Each of the standing pieces 35 is provided. The photocatalyst filter 3 on which the upright piece 35 is formed has a large surface area in contact with the gas due to the corrugated uneven surface formed by the mountain portion 31 and the valley portion 32, and at the same time, is formed on the peak portion 31 or the valley portion 32. The contact area with gas and light is also increased by the amount of the upright piece 35 on the inner surface of the fluid passage hole 33 and the opening edge. Therefore, the catalytic reaction is efficiently performed.

The upright piece 35 can be efficiently formed by cutting and raising by punching at the same time as or immediately after pressing the uneven shape. The standing pieces 35 provided on both sides of the opening edge portion are long pieces extending over substantially the entire length of each opening edge portion, but of course, a plurality of standing pieces may be provided at intervals. In this case, standing pieces having a long protruding length can be alternately (staggered) formed at both opening edges by cutting and raising. By cutting up from the center to both sides, the height dimension of the standing pieces provided on both sides of the opening edge becomes the same dimension, specifically, about half of the dimension in the width direction orthogonal to the row direction of the through groove. It becomes a dimension. By forming the upright piece 35 by cutting and raising, the base material can be used without waste, and the contact area can be maximized.

The photocatalyst layer is a layer in which photocatalyst particles such as ultraviolet-excited photocatalyst particles such as titanium oxide and visible light-excited photocatalyst particles containing tungsten trioxide as a main component are supported on the surface of a member. When a concave-convex shape composed of peaks 31 and valleys 32 is formed by press working, if a photocatalyst layer is formed on the surface in advance, the layer may be peeled off or the shape accuracy may be disturbed. In order to avoid this, the above layer may be formed after processing into an uneven shape. The method of supporting the photocatalyst particles (formation of the photocatalyst layer) is not particularly limited, but a slurry immersion impregnation method, which is relatively inexpensive, is preferable. Other means such as an immersion impregnation method, a vacuum impregnation method, and a sol-gel method can also be used.

The light irradiation units 5 are provided on both ends of the photocatalyst filter 3 in the direction in which the peaks 31 and valleys 32 extend, and ultraviolet rays or visible rays are directed toward the inside where the peaks 31 and valleys 32 extend, respectively. Irradiate the light of light. The light irradiation unit 5 is provided along both ends of the photocatalyst filter 3 over a region having substantially the same length so as to irradiate the entire surface of the photocatalyst filter 3 with light substantially evenly. As such a light irradiation unit 5, a columnar light guide member 50 that emits light from the outer peripheral surface toward the inside is provided, and light sources 51 are provided at both ends of the light guide member 50, whereby the light source 51 The light is taken into the light guide member 50 and irradiates the inner metal filter surface from the light emitting surface (outer peripheral surface). The light emitting surface is provided with irregularities that emit light.

In addition, instead of using such a light guide member 50, an LED substrate of the length provided with LED elements as a light source at predetermined intervals along the axial direction is arranged, and a position excluding the inner side. It is also preferable that a reflective member is provided on the inside of the surface to irradiate the inside with light. As the light source 51, an LED element that emits ultraviolet rays or visible light having a wavelength suitable for the photocatalyst of the photocatalyst filter 3 is used, and the LED substrate 52 having the LED element is arranged so as to face both ends of the light guide member 50. Has been done. The LED substrate 52 may be provided only at one end of the light guide member 50, and only the reflector may be provided at the other end.

The light emitted from the light emitting surface (outer peripheral surface) of the light guide member 50 to the filter surface activates the photocatalyst on the surface and also escapes from the fluid passage hole 33 of the filter 3 to the other surface side to collect light. It is reflected on the surfaces of the dust filters 4A and 4B and irradiates the entire other surface of the photocatalyst filter 3 to activate the photocatalyst on the surface as well. In this example, the light irradiation unit 5 having the light sources 51 on both ends of the photocatalyst filter 3 is provided, but it may be provided only on one side and only the reflection member that reflects light inward on the other side.

The dust collection filters 4A and 4B are corrugated type, and a HEPA (High Efficiency Particulate Air) filter made of a filter medium such as glass fiber or synthetic fiber is suitable, but other dust collection filters may also be used. The size is set to cover the entire front / back surface of the photocatalyst filter 3. In this example, it is provided on both the front and back sides, but it may be provided on only one side.

The dust collection filters 4A and 4B have a multi-layer structure, and a white filter layer is formed on the side facing the photocatalyst filter 3, and the light irradiated from the light irradiation unit 5 to the front and back surfaces of the photocatalyst filter 3 is formed. Is reflected on the facing surface so that the front and back surfaces are efficiently irradiated. Like the photocatalyst filter 3, the white filter layer preferably carries a photocatalyst. As a result, not only dust collection / reflection but also a catalytic function can be provided, and dust and the like trapped in the filter layer and passing air can be purified by photocatalytic action. The photocatalytic action of the filter layer on the opposite surface side can also decompose viruses and the like trapped in other outer filter layers.

A dark-colored filter layer containing activated carbon is formed in the middle of the dust collecting filters 4A and 4B or on the outside opposite to the facing surface, efficiently trapping dust and odorous components in the air, and outside the light. It is configured to prevent leakage to. Such a filter layer is composed of a layer in which activated carbon particles are supported by coating or the like, whereby a dark-colored layer can be obtained.

The photocatalyst unit 2 including the photocatalyst filter 3, the light irradiation unit 5, and the dust collection filters 4A and 4B described above is surrounded by a colored light shielding wall 7 constituting the flow path walls of the fluid supply path 70 and the fluid discharge path 71. It is set in the state of. The light shielding wall 7 covers the end surface 36 (the side where the light irradiation unit 5 exists) excluding the front and back surfaces of the photocatalyst filter 3 and the end surfaces 40 of the dust collecting filters 4A and 4B adjacent to the end surface 36, and the light irradiation unit 5 It is configured to prevent light from leaking to the outside.

As shown in FIG. 7, the photocatalyst filter 3 may be configured by combining a plurality of divided components. In this case, as shown in the figure, it is also preferable to further interpose the light irradiation unit 5 or to interpose a reflector. In particular, when the area becomes large, the light irradiation from the end portion may not be sufficient, and in such a case, it is preferable to provide a light irradiation portion between the divided configurations as shown in the figure. The form of the photocatalyst filter 3 and the dust collecting filters 4A and 4B is not limited to the plate shape shown in FIGS. 1 to 7, but also includes a tubular shape and a disk shape.

8 and 9 show an embodiment configured in a tubular shape. In this method, the photocatalyst filter 3 is rounded in a tubular shape around an axis parallel to the direction in which the peak portion 31 and the valley portion 32 extend toward the inside with one surface of the front and back surfaces facing inward, and the peak portions 31 or the peak portions 31 at both ends or By superimposing and joining the valley portions 32 to each other, the valley portions 32 are formed into a tubular shape as shown in FIG. A ring-shaped light irradiation unit 5 that emits light toward the photocatalyst filter 3 is provided on one or both of the upper end side and the lower end side in the direction in which the mountain portion 31 and the valley portion 32 extend.

Further, the fluid supply path 70 for supplying the fluid to the inner surface of the photocatalyst filter 3, the fluid discharge path 71 for discharging the fluid discharged from the outer surface of the photocatalyst filter 3, and the fluid supply path 70 and the fluid discharge path 71. It is equipped with the same tubular dust collecting filters 4A and 4B which are provided so as to face the front and back surfaces of the photocatalyst filter 3.

Also in this example, the fluid supply path 70 and the fluid supply path 70 and the fluid supply path 70 and the inner and outer surfaces of the tubular photocatalyst filter 3 are irradiated with light inward along the extending direction of the mountain portion 31 or the valley portion 32 from the upper and lower light irradiation portions 5. The fluid is passed through the fluid discharge path 71 in the thickness direction of the filter 3, for example, from the inside to the outside, and harmful substances and odors in the fluid are efficiently decomposed by the photocatalyst supported on the front and back surfaces of the filter and the inner surface of the fluid passage hole. -Can be removed.

FIG. 10 shows an embodiment in which the photocatalyst filter 3 and the dust collection filters 4A and 4B are configured in a disk shape. In this method, while maintaining the photocatalyst filter 3 in a flat plate shape, one of the ends in the direction in which the peak 31 and the valley 32 extend is deformed inward and the other outward in an annular shape, and the peak 31 or valley 32 at both ends is deformed in an annular shape. As shown in FIG. 10A, they are formed into a disk shape by superimposing and joining them. A tubular light irradiation unit 5 that emits light toward the photocatalyst filter 3 is provided on one or both of the inner and outer ends in the direction in which the mountain portion 31 and the valley portion 32 extend.

Further, a fluid supply path 70 for supplying a fluid to the upper surface of the photocatalyst filter 3, a fluid discharge path 71 for discharging the fluid discharged from the lower surface of the photocatalyst filter 3, a fluid supply path 70, and a fluid discharge path 71. The photocatalyst filter 3 is provided with the same disk-shaped dust collecting filters 4A and 4B, which are provided so as to face the front and back surfaces of the photocatalyst filter 3.

Also in this example, the fluid supply path 70 is also irradiated to the upper and lower surfaces of the disk-shaped photocatalyst filter 3 inward along the extending direction of the mountain portion 31 or the valley portion 32 from the inner and outer light irradiation portions 5. And, the fluid is passed through the fluid discharge path 71 in the thickness direction of the filter 3, for example, from the upper side to the lower side, and harmful substances and odors in the fluid are efficiently carried by the photocatalyst supported on the front and back surfaces of the filter and the inner surface of the fluid passage hole. Can be disassembled and removed well.

Although the embodiments of the present invention have been described above, the present invention is not limited to these examples, and it goes without saying that the present invention can be implemented in various forms without departing from the gist of the present invention.

1 Fluid purification structure 2 Photocatalyst unit 3 Photocatalyst filter 4A, 4B Dust collection filter 5 Light irradiation part 6 Housing 7 Light shielding wall 31 Mountain part 32 Valley part 33 Fluid passage hole 34 Bridging part 35 Standing piece 36 End face 40 End face 50 Optical member 51 Light source 52 Substrate 70 Fluid supply path 71 Fluid discharge path

Claims (6)

It is composed of corrugated members in which a plurality of peaks and valleys are alternately formed, and fluid passage holes for passing fluid are formed in one or both of the top of the peak and the bottom of the valley, and the front and back surfaces are formed. A photocatalyst filter with a photocatalyst supported on it,
The photocatalytic filter is provided on one or both of one end side and the other end side in the direction in which the peaks and valleys extend, and ultraviolet rays or visible light are provided toward the inward where the peaks and valleys extend. A light irradiation part that irradiates light and
A fluid supply path provided on one side of the front and back surfaces of the photocatalyst filter and supplying a fluid toward the one side,
A fluid discharge path provided on the other side of the front and back surfaces of the photocatalyst filter, supplied from the fluid supply path, passed through the fluid passage hole, and discharges the fluid discharged from the other surface.
A dust collecting filter that is installed in one or both of the fluid supply path and the fluid discharge path and is provided so as to face the one surface or the other surface.
A photocatalytic fluid purification structure characterized by being equipped with. The fluid cleaning structure according to claim 1, wherein the one surface of the photocatalyst filter in the dust collection filter or the surface facing the other surface is a white filter surface. The fluid cleaning structure according to claim 2, wherein a photocatalyst is supported on the white filter surface. The fluid cleaning structure according to any one of claims 1 to 3, wherein the dust collecting filter includes a dark-colored filter layer containing activated carbon. A photocatalyst unit used for the fluid purification structure according to any one of claims 1 to 4, further comprising the photocatalyst filter, the light irradiation unit, and the dust collection filter. A colored light shielding wall is provided which covers the end face of the photocatalyst filter excluding the front and back surfaces and the end face of the dust collecting filter adjacent to the end face and constitutes a flow path wall of the fluid supply path and the fluid discharge path. , The photocatalyst unit according to claim 5.

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