JP7021761B2 - Metal filter and method for manufacturing the metal filter - Google Patents

Description

The present invention relates to a metal filter suitably used as a fluid cleaning filter having a catalyst layer such as a photocatalyst, activated carbon, fragrance, manganese dioxide or the like or an adsorption layer formed on the surface thereof, or a grease filter in a kitchen or the like.

As a filter of this type, for example, a photocatalyst filter is a filter that decomposes and removes harmful substances in the air by a photocatalyst excited by ultraviolet rays in the process of passing air through the photocatalyst layer. It has been proposed to form a photocatalyst layer on which titanium oxide or the like is supported on the surface of a plate-shaped base material such as a metal mesh. However, a filter using a metal mesh or a metal net as a base material cannot secure a sufficient area for the passing air to contact the photocatalyst layer, and there is a problem that a sufficient cleaning effect cannot be obtained by one sheet. be.

On the other hand, for example, in Patent Document 1, metal oxide-based ceramic porous bodies such as alumina, cordylite, mulite, zirconia, silica, and magnesia, and non-oxide-based ceramic porous bodies such as silicon carbide and silicon nitride are porous. It has been proposed to form a photocatalyst layer on which titanium oxide or the like is supported on a plate-shaped base material made of a ceramic. Further, in Patent Document 2, the titanium foil is etched in an aperiodic pattern to form an aperiodic spongy structure having a large number of fine flow paths penetrating the front and back, and the titanium foil is anodized and then heat-treated. A titanium oxide base is formed on the surface thereof, and anodized titanium oxide particles are baked onto the titanium oxide base to form a photocatalyst layer.

As in Patent Documents 1 and 2, a complex and fine flow path is formed on the base material, and a photocatalyst layer is coated on the surface thereof to secure an area where a fluid such as air passing through is in contact with the photocatalyst layer. It is possible. However, there is a problem that the pressure loss when the fluid is circulated in such a fine flow path becomes large and the passage efficiency of the fluid decreases. In addition, ultraviolet rays do not sufficiently spread inside the fine flow path, and there is a certain limit to the cleaning effect. Further, the ceramic filter of Patent Document 1 has a high material and manufacturing cost, and has a high material and manufacturing cost.
The degree of freedom of the shape is low, it is necessary to handle it delicately so that it will not be cracked by impact, etc., and the filter described in Patent Document 2 also has a problem that the etching process is expensive and there is a limit to the reduction of production cost. ..

Further, a metal grease filter is used as a filter for removing oils and fats in smoke exhaust from a kitchen or the like (see, for example, Patent Document 3), but the conventional structure has a metal mesh or a metal net inside the frame. , Punching metal and other plate-shaped base materials are combined and set. However, such a base material is required to have a high manufacturing cost, a large resistance to the passage of flue gas, and a material capable of recovering fats and oils more efficiently.

Utility Model Registration No. 3150894 Japanese Unexamined Patent Publication No. 2011-183240 Japanese Patent Application Laid-Open No. 2003-336876

Therefore, in view of the above-mentioned situation, the present invention seeks to solve the problem by ensuring a sufficient contact area between the passing fluid such as air and the catalyst layer, the adsorption layer, etc., and reducing the passage resistance of the fluid, that is, the pressure loss. The point is to realize a metal filter at low cost, which can suppress and improve the passing efficiency, have a high degree of freedom in shape, and can efficiently obtain an excellent cleaning effect and the like.

That is, the present invention includes the following inventions.

(1) One or both of the peaks and valleys of the metal plate body in which a plurality of rows of peaks and valleys are alternately formed has through grooves extending in the row direction for allowing fluid to pass therethrough. Moreover, the metal filter is characterized by having an upright piece standing on the convex side of the mountain portion or the valley portion at the opening edge portion of the through groove.

(2) The metal filter according to (1), wherein the upright piece is provided on both of a pair of opening edges extending in a row direction facing the through groove and facing each other.

(3) The metal filter according to (2), wherein the standing pieces provided on both sides of the opening edge are long pieces extending over almost the entire length of each opening edge.

(4) The metal according to (2) or (3), wherein the height dimension of the standing piece provided on both sides of the opening edge is approximately half the dimension in the width direction orthogonal to the row direction of the through groove. filter.

(5) The metal filter according to (4), wherein the upright piece is a cut-up piece.

(6) The metal filter according to any one of (1) to (5), wherein the upright piece projects substantially flush with respect to the intermediate wall portion connecting the mountain portion and the valley portion.

(7) The metal filter according to any one of (1) to (6), wherein a plurality of through grooves are provided in the mountain portion or the valley portion at intervals in the row direction.

The metal filter according to the present invention as described above is a row for allowing fluid to pass through one or both of the peaks and valleys of a metal plate body in which a plurality of rows of peaks and valleys are alternately formed. Since it has a through groove extending in the direction and has an upright piece standing on the convex side of the mountain portion or the valley portion at the opening edge of the through groove, a larger surface area is provided on the uneven surface by the mountain portion and the valley portion. In addition to this, the surface area of the upright piece of the opening edge of the through groove formed in the mountain or valley increases, and the contact area between the fluid that hits the uneven surface and passes through the through groove and the surface of the metal filter. Therefore, even when a catalyst layer such as a photocatalyst, activated carbon, fragrance, manganese dioxide, or an adsorption layer is formed on the surface, the catalytic reaction and the adsorption action are efficiently performed.

In addition, it does not circulate through the fine flow path as in the past, but has a structure in which the fluid that hits the uneven surface passes through the through groove as it is, and the standing piece also stands on the convex side of the mountain portion or the valley portion. Therefore, the passage resistance of the fluid is hardly generated, the pressure loss can be suppressed to a small value, the passage efficiency is improved, and an excellent cleaning effect and an effect of removing oils and fats can be efficiently obtained. Further, since the surface area is increased by the uneven surface and the standing pieces standing on the convex surface side, even when the catalyst layer of the photocatalyst is formed on the surface, the ultraviolet rays can be efficiently irradiated to the catalyst layer, which is a conventional method. A significantly superior cleaning effect can be obtained as compared with the one that irradiates the inside of such a fine flow path with ultraviolet rays.

Furthermore, since the structure is such that through grooves and upright pieces are formed on the uneven metal plate, the production cost can be kept low by machining such as pressing compared to conventional ceramic filters and filters that require etching. It is possible. In addition, it is easier to deform after processing compared to ceramic products, and the degree of freedom in shape is high.

Further, when the standing pieces are provided on both of the pair of opening edges extending in the row direction facing the through groove and facing each other, the standing pieces efficiently contact the fluid passing through the through groove from both sides. Therefore, it is possible to more reliably secure the contact area with the fluid while suppressing the pressure loss.

In particular, when the standing pieces provided on both sides of the opening edge are long pieces extending over almost the entire length of each opening edge, the contact area with the fluid can be more reliably secured.

Further, if the height dimension of the upright piece provided on both sides of the opening edge is approximately half the dimension in the width direction orthogonal to the row direction of the through groove, the efficiency is suppressed while suppressing the pressure loss due to the upright piece. A good contact area can be secured. In particular, when the standing piece is cut and raised, the contact area can be maintained to the maximum without wasting the base material.

Further, when the upright piece is a cut-up piece, the upright piece can be efficiently formed at low cost by machining without brazing or the like.

Further, when the upright piece projects substantially flush with respect to the intermediate wall portion connecting the mountain portion and the valley portion, the passage resistance of the fluid can be suppressed to a smaller value, and the fluid can be reduced. It is possible to suppress pressure loss, improve passage efficiency, and efficiently obtain an excellent cleaning effect and an effect of removing oils and fats.

Further, in the case where a plurality of the through grooves are provided at intervals in the row direction in the mountain portion or the valley portion, the structure is such that the base metal is bridged between them, so that the shape retention is improved and structurally. It is possible to obtain the required shape retention according to the application.

The perspective view which shows the metal filter which concerns on the typical embodiment of this invention. Also a plan view of a metal filter. Also front view. Similarly, a cross-sectional view of the main part. Similarly, a perspective view of the main part. An exploded perspective view of an example in which a metal filter is also configured as a photocatalytic filter. Similarly, a perspective view of a photocatalytic filter as an example of the present invention. An exploded perspective view of an air purifier that also incorporates a photocatalytic filter. An explanatory diagram of a main part showing the flow of air in an air purifier. (A) is a perspective view showing another usage mode of the metal filter, and (b) is a perspective view showing still another usage mode of the metal filter. The perspective view which also shows the other usage form of a metal filter. (A) is a cross-sectional view of a main part showing a modified example of the metal filter, and (b) is a cross-sectional view of a main part showing another modified example of the metal filter. A perspective view of a main part showing still another modification of the metal filter.

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

As shown in FIGS. 1 to 5, the metal filter 1 of the present invention has one of the peaks 20 and the valleys 21 of the metal plate body 2 in which a plurality of rows of peaks 20 and valleys 21 are alternately formed. Alternatively, both of the through grooves 10 extending in the row direction for allowing the fluid to pass through are provided, and the upright piece 30 standing on the convex surface side of the mountain portion 20 or the valley portion 21 at the opening edge portion 11 of the through groove 10. 31 is provided.

Although not shown, the metal filter 1 is further configured as a cleaning filter having a catalyst layer such as a photocatalyst, activated carbon, fragrance, manganese dioxide, or an adsorption layer formed on the surface thereof, or forms such a catalyst layer. It can also be suitably used as a grease filter in a kitchen or the like as it is as a metal material. The catalyst layer and the adsorption layer may be formed on the surface of the flat plate state before being formed into the uneven shape consisting of the peaks 20 and the valleys 21, or may be formed on the uneven surface after being formed into the uneven shape. ..

For example, in the case of forming an uneven shape consisting of a mountain portion 20 and a valley portion 21 by press working, if a catalyst layer or the like is formed on the surface in advance, the layer may be peeled off or the shape accuracy may be disturbed. There is also. In order to avoid this, the above layer may be formed after being processed into an uneven shape.

The metal filter 1 of the present invention can be used so that the fluid hits the uneven surface of the peak portion 20 and the valley portion 21 and passes through the through groove 10. That is, a conventional concave-convex-shaped filter, for example, a metal filter used for a car catalyst, is configured by spirally winding a concave-convex-shaped filter having peaks and valleys, but the fluid is peaks or valleys. The metal filter 1 of the present invention allows the fluid to pass from one surface of the concave-convex shape to the other surface through the through grooves 10 formed in the mountain portion 20 and the valley portion 21, although the portion is passed along the extending direction. It is something to pass through.

The fluid may be supplied or discharged in the extending direction of the mountain portion 20 or the valley portion 21, but the fluid after supply or before discharge may pass through each through groove 10 and move from one surface to the other surface. To circulate. A fluid is supplied or discharged in a direction orthogonal to the uneven surface, that is, a direction orthogonal to both the extending direction of the mountain portion 20 or the valley portion 21 and the arrangement direction in which the mountain portion 20 and the valley portion 21 are lined up, and each through groove is provided. The fluid may be allowed to pass through 10. The flow form of the fluid can be various, but in any case, the fluid is configured to pass through the through groove 10 formed in the mountain portion 20 or the valley portion 21.

Such a metal filter 1 has a large surface area in contact with a fluid due to the uneven surface formed by the peaks 20 and the valleys 21, and at the same time, the inner surface and openings of the through groove 10 formed in the peaks 20 or the valleys 21. The contact area with the fluid is also increased by the amount of the standing piece 30/31 at the edge. Therefore, for example, when a catalyst layer or an adsorption layer is formed on the surface, the catalytic reaction or the adsorption action is efficiently performed.

Further, since the standing piece 30/31 also stands on the convex side of the mountain portion 20 or the valley portion 21, the fluid corresponding to the uneven surface passes through the through groove 10 without delay and escapes, and there is almost no fluid passage resistance. , Pressure loss can be suppressed to a small extent. Therefore, an excellent cleaning effect can be obtained, and the effect of removing oils and fats can be efficiently obtained even when the grease filter is used because it is nonflammable. Further, when the catalyst layer of the photocatalyst is formed on the surface, the upright piece 30/31 is formed on the uneven surface, the inner surface of the through groove, and the surface of the upright piece 30/31 without disturbing the entry of ultraviolet rays. The layer can be efficiently irradiated with ultraviolet rays.

The uneven shape composed of the mountain portion 20 and the valley portion 21 and the standing piece 30/31 can be formed at low cost by press working. In particular, the upright piece 30/31 can be efficiently formed by cutting and raising by punching at the same time as or immediately after pressing the uneven shape. Of course, it is not limited to such processing methods and procedures.

In this example, the peaks 20 and the valleys 21 are bent into an angular square shape to form an uneven shape as a whole, but the peaks and valleys are bent into a gently continuous curved surface. It may be the one that was done. In the "mountain part" and "valley part", one surface of the uneven surface of the uneven shape is the upper surface, the other surface is the lower surface, the part protruding to the upper surface side is the "mountain part", and the part protruding to the lower surface side is "mountain part". Tanibe ".

The through groove 10 is formed in all of the mountain portion 20 and the valley portion 21 in this example, but is not limited thereto. For example, only the mountain portion 20 or only the valley portion 21 may be used. In particular, in the case of a tapered concave-convex shape in which the width gradually narrows toward the top surface (bottom surface) of the mountain portion 20 (valley portion 21) as in this example, for example, if the fluid is passed from the mountain portion 20 side. For example, as shown in FIG. 12, if the through groove 10 is provided only on the valley 21 side, of course, the flow resistance increases due to the absence of the through groove on the mountain portion 20, but the fluid hits the mountain portion 20. As the flow is disturbed, the fluid always passes through a space that gradually narrows to the valley portion 21, so that the fluid comes into contact with the intermediate wall portion 22 so as to be pressed against it in the process, and the effect of the contact can be further enhanced. ..

Further, even if the through groove 10 is provided in both the mountain portion 20 and the valley portion 21 as in this example, or even if it is provided in only one of the mountain portion 20 or the valley portion 21, all the mountain portions 20 or the valley portion 21 are provided. It is not necessary to provide it in all valleys 21. One or more mountain portions 20 or valley portions 21 may be skipped and formed. The dimensions, number, arrangement, and the like of the through grooves 10 can be appropriately determined so as to obtain suitable shape retention and distribution resistance according to the application, size, and the like.

In this example, the through groove 10 is a long groove in the row direction, and as shown in FIGS. 10 (a), 10 (b) and 11, for example, the entire groove can be bent and deformed and fitted into a frame (not shown) for use. As described above, the through groove 10 is configured to be easily deformed, but in addition to the form, for example, a plurality of long grooves in the width direction orthogonal to the row are provided intermittently at intervals in the row direction. Of course, it may be an orthogonal one.

In this example, two through grooves 10 long in the row direction are connected to one mountain portion 20 or valley portion 21 at intervals, and a bridging portion 23 formed between them (the mountain portion 20 or the valley portion 20). The structure is such that the shape retention can be maintained as a whole by the remaining portion between the through grooves 10 in the valley portion 21). However, the length and spacing of the through grooves 10 can be appropriately determined according to the plate thickness, other dimensions, and the degree of shape retention required. For example, three or more through grooves 10 are continuously provided in the row direction. It may be composed of only one.

The standing pieces 30 and 31 are provided on both of the pair of opening edge portions 11 and 11 facing the through groove 10 and extending in the row direction, respectively, and the opening edge portion 11 with respect to the fluid passing through the through groove 10. , 11 are configured to be able to efficiently contact each other. However, as shown in FIG. 12B, it can of course be provided only on one opening edge portion 11. In the case of cutting and raising, the protruding length of the standing pieces 30 and 31 formed on the one opening edge portion 11 can be lengthened.

The standing pieces 30 (31) provided on both sides of the opening edge are long pieces extending over almost the entire length of each opening edge, but as shown in FIG. 13, a plurality of standing pieces 30 are spaced apart from each other. Of course, it can be provided. In this case, as shown in FIG. 13, standing pieces 30 (31) having long protruding lengths can be alternately (staggered) formed on both opening edges 11 by cutting and raising.

The standing pieces 30 and 31 are cut-up pieces. Separately formed pieces can be brazed or the like, but by using cut pieces, they can be formed efficiently and at low cost by machining. Specifically, the standing pieces 30 and 31 are cut and formed so as to be torn on both sides along the center of the mountain portion 20 or the valley portion 21, thereby forming the through groove 10. As a result of cutting up from the center to both sides, the height dimensions of the upright pieces 30 (31) provided on both the opening edges 11 and 11 on both sides of the through groove 10 are the same, and specifically, the penetration. It is approximately half the dimension in the width direction orthogonal to the row direction of the groove.

By forming the upright piece 30 (31) by cutting and raising in this way, the base metal can be formed without waste, and the contact area can be maximized. The standing piece 30 (31) projects substantially flush with respect to the intermediate wall portion 22 connecting the mountain portion and the valley portion. That is, the upright piece 30 (31) and the through groove 10 are formed by cutting up using the entire width of the top surface (bottom surface) of the mountain portion 20 (valley portion 21), and the through groove 10 and the intermediate wall portion 22 are formed. It is configured so that there are no steps. Therefore, the passage resistance when the fluid passes is minimized, the pressure loss of the fluid is suppressed, the passage efficiency is improved, and an excellent cleaning effect and an effect of removing oils and fats can be obtained.

Hereinafter, an embodiment in which the metal filter 1 according to the present invention is configured as a photocatalyst filter having a photocatalyst layer formed on the surface thereof and an air purifier using the photocatalyst filter is configured will be described with reference to FIGS. 6 to 9.

As shown in FIGS. 8 and 9, the air purifier has an inflow port 41 for taking in air into the housing 40 and a housing at predetermined positions on the upper, lower, left and right peripheral walls connecting the front and rear walls of the housing 40. A discharge port 42 for discharging air to the outside of the 40 is provided, and inside the housing 40, a single or a plurality of photocatalyst filters 5 and a single or a plurality of ultraviolet rays that irradiate the photocatalyst filter 5 with ultraviolet rays facing the photocatalyst filter 5 are provided. The irradiation unit 6 is arranged side by side in the front and rear. The ultraviolet irradiation unit 6 is provided with an ultraviolet LED substrate facing the entire surface of the photocatalyst filter 5.

Inside the housing 40, as shown in FIG. 9, an air supply path 43 from the inflow port 41 to the air inlet of the photocatalyst filter 5 and an air discharge from the air outlet of the photocatalyst filter 5 to the discharge port. A passage 48 is provided, and a fan 8 for forcibly flowing air is provided in the middle of the air supply passage 43 or the air discharge passage 48. Of the front cover portion 45A, the intermediate base portion 45B, and the rear cover portion 45C constituting the housing 40, the inner surface side of the front cover portion 45A and the front side of the base portion 45B have frame portions from the left and right inflow ports 41. A partition wall or the like constituting an air supply path 43 for supplying air is appropriately provided on the front surface of the photocatalyst filter 5 and the dust collection filter 7 attached to the 46.

Further, on the rear surface side of the substrate portion 45B and the front surface side of the rear side cover portion 45C, the air that has passed through the dust collection filter 7 and the photocatalyst filter 5 and escaped sideways, that is, inward from the gap with the ultraviolet irradiation portion 6. A partition wall or the like for forming an air discharge path for guiding the fan 8 to the fan 8 and further leading the fan 8 to the upper discharge port 42 is appropriately provided.

The positions of the air inlet and outlet are, for example, those with an inlet on the lower wall as well as the left and right walls, those with an outlet on the lower wall instead of the upper wall, and those with an inlet on the lower wall. , Those with outlets on the left and right walls or upper wall, those with inlets and outlets on the left and right walls, etc., as long as they have inlets and outlets on the upper, lower, left and right peripheral walls, and various other configurations. Is possible.

In order to guide the air taken into the inflow port 41 to the front side of the frame portion 46 to which the photocatalyst filter 5 is attached, the inflow port 41 extends diagonally forward from the rear edge of the opening edge of the inflow port 41 toward the inside of the housing and the frame portion. A continuous introduction wall 47 is provided at the front end of the 46. The air taken in from the inflow port 41 passes through the dust collection filter 7 and the photocatalyst filter 5 from the front side of the frame portion 46 through the air supply path 43 consisting of the space between the introduction wall 47 and the front cover portion 45A, and is an air discharge path. It will be guided to the fan side through.

As described above, such an introduction wall 47 constitutes an air supply path 43 that guides air to the front side of the frame portion 46 to which the photocatalyst filter 5 is attached, and is arranged behind the frame portion 46 in the housing 40. It also acts as a blocking wall to prevent the ultraviolet rays emitted by the ultraviolet irradiation unit 6 from leaking to the outside through the inflow port 41.

As shown in FIGS. 6 and 7, the photocatalyst filter 5 is configured by fitting the above-mentioned metal filter 1 into a tubular frame 51 made of synthetic resin. The frame body 51 includes a frame main body 52 in which a hooking piece 52a for hooking a peripheral end portion of one surface (lower surface in FIG. 6) in the thickness direction of the metal filter 1 is projected from the inner peripheral surface, and a frame. An annular frame member 53 that hooks the peripheral end of the other surface (upper surface in FIG. 6) of the metal filter 1 that is mounted on the inner peripheral side of the main body 52 in a state of being hooked on the hooking piece 52a. It is composed of and more.

The frame member 53 is provided with a grip piece 54 extending on the opposite side to the metal filter 1, and as shown in FIG. 8, the grip piece 54 is locked to the inner surface of the frame portion 46 to which the photocatalyst filter 5 is attached. The locking groove 46b is formed at the corresponding position. The photocatalyst filter 5 can be easily removed and attached from the frame portion 46 by pinching the grip piece 54 by hand, which improves maintainability and allows the grip piece 54 to stably hold the dust collection filter 7.

An annular sealing material 55 made of a soft material is provided on the outer peripheral portion of the frame 51. Specifically, an annular recess is formed on the outer peripheral surface by assembling the frame main body 52 and the frame member 53, and the sealing material 55 is attached to the recess. The sealing material 55 is preferably made of silicone rubber. By providing such a sealing material 55, the photocatalyst filter 5 is in close contact with the frame portion 46 of the housing 40 and is stably held, and the photocatalyst filter 5 can be attached and detached only by this close contact, so that workability is good and sealing performance is good. It is possible to ensure that air flows through the gaps of the photocatalyst filter 5 by increasing the amount of air, and further, it has an effect of preventing the photocatalyst filter 5 from vibrating in the frame portion 46 and causing noise.

As a photocatalyst, a titanium dioxide film is formed on the entire surface of the metal plate body 2 of the metal filter 1. A known method can be adopted for forming the titanium dioxide film. For example, it is preferable to form a coating after roughening the surface by sandblasting, etching, jib processing during press processing, chemical research treatment, or a combination thereof. When this photocatalyst is irradiated with ultraviolet rays from the ultraviolet irradiation unit 3, OH radicals are generated, and harmful components and odorous components in the air are decomposed.

As shown in FIG. 9, the ultraviolet irradiation unit 6 is provided at a position facing the air outlet side surface (lower surface in FIG. 9) of the photocatalyst filter 5 and at a position separated from the surface by a predetermined distance. It is arranged so as to irradiate ultraviolet rays from the position toward the surface of the photocatalyst filter 5. As a result, an air discharge path 48 is formed between the ultraviolet irradiation unit 6 and the photocatalyst filter 5 to discharge the air emitted from the photocatalyst filter 5 laterally substantially parallel to the outlet side surface.

More specifically, as shown in FIG. 9, the ultraviolet irradiation unit 6 is an ultraviolet light source (in this example, an ultraviolet LED element) attached to the substrate 60 and the surface of the substrate 60 facing the photocatalyst filter 5. It is composed of 61 and a light-transmitting cover plate 62 interposed between the substrate 60 and the photocatalyst filter 5 and covering the substrate 60 and the ultraviolet light source 61. The substrate 60 and the cover plate 62 are attached to a fixed portion in the housing 40 so as to face each other through a gap serving as an air discharge path 48 over all the air outlets of the photocatalyst filter 5.

The air that has passed through the photocatalyst filter 5 and exited to the rear surface side (lower surface side in FIG. 9) basically passes through the gap (air discharge path 48) between the cover plate 62 of the ultraviolet irradiation unit 6 and the surface of the cover plate 62. It will be discharged to the side of the side end (center side of the housing) along the above. Some air circulates between the back surface of the cover plate 62 and the substrate 60. The cover plate 62 prevents dust and the like from accumulating on the substrate 60 and the ultraviolet light source 61. Dust and the like accumulated on the cover plate 62 can be easily removed only by cleaning the cover plate 62 at the time of maintenance or replacement of the photocatalyst filter 5.

As described above, in this example, the ultraviolet irradiation unit 6 is arranged face-to-face on the surface of the photocatalyst filter 5 on the air outlet side, but at a position facing the surface on the inlet side and at a position separated from the surface by a predetermined distance. From this position, the surface on the inlet side is arranged so as to irradiate ultraviolet rays, whereby air is taken in between the ultraviolet irradiation unit 6 and the photocatalyst filter 5 from the side substantially parallel to the surface on the inlet side, and the photocatalyst is taken in. It is also preferable to supply air to the filter 5. Further, the photocatalyst filter 5 may be similarly provided with ultraviolet irradiation portions on both the outlet side and the inlet side of the air to form the same air discharge path and air supply path.

In the air purifier 4 of the present embodiment, the photocatalyst filter 5 is configured by using the above-mentioned metal filter 1 in which the photocatalyst is supported on the surface, and the air inlet side or outlet side surface of the photocatalyst filter 5 is used. The ultraviolet irradiation unit 6 is arranged at a position separated from the ultraviolet irradiation unit 6, and air is taken in from the side substantially parallel to the surface on the inlet side or substantially parallel to the surface on the outlet side. It is equipped with an air purification structure that forms an air discharge path that discharges air to the side. Since such an air purifying structure S does not supply or discharge air through the gaps between the ultraviolet lamps, the degree of freedom in designing the ultraviolet irradiation unit 6 is significantly improved, and the ultraviolet irradiation unit 6 to the depth of the photocatalyst filter 5 Efficient irradiation of ultraviolet rays is easy in design.

Further, since air is supplied or discharged to the photocatalyst filter from the side of the gap between the photocatalyst filter 5 and the ultraviolet irradiation unit 6, it is not necessary to provide an air supply path or an exhaust path on the opposite side of the ultraviolet irradiation unit. , The thickness of the entire air purifier can be suppressed, making it possible to make it thinner and more compact. As shown in FIGS. 8 and 9, since the air is supplied / discharged from the extending direction of the mountain portion 20 or the valley portion 21 of the photocatalyst filter 5, the air is supplied / discharged to all the mountain portions 20 or the valley portion 21. Air can be supplied / discharged evenly and efficiently.

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

1 Metal filter 2 Metal plate body 3 Ultraviolet irradiation part 4 Air purifier 5 Photocatalyst filter 6 Ultraviolet irradiation part 7 Dust collection filter 8 Fan 10 Through groove 11 Opening edge 20 Mountain part 21 Tani part 22 Intermediate wall part 23 Bridging part 30 Standing Piece 31 Standing piece 40 Housing 41 Inflow port 42 Outlet 43 Air supply path 45A Front cover 45B Base 45C Rear cover 46 Frame 46b Locking groove 47 Introductory wall 48 Air exhaust path 51 Frame 52 Frame body 52a Hook piece 53 Frame member 54 Grip piece 55 Sealing material 60 Substrate 61 Ultraviolet light source 62 Cover plate

Claims (7)

One or both of the peaks and valleys of the metal plate body in which a plurality of rows of peaks and valleys are alternately formed has through grooves extending in the row direction for allowing fluid to pass therethrough.
The opening edge of the through groove has an upright piece that stands up on the convex side of the mountain or valley.
The upright piece projects substantially flush with respect to the intermediate wall portion connecting the mountain portion and the valley portion .
Moreover, a metal filter having a catalyst layer or an adsorption layer formed on the surface . The metal filter according to claim 1, wherein the upright pieces are provided on both of a pair of opening edges extending in a row direction facing the through groove and facing each other. The metal filter according to claim 2, wherein the standing pieces provided on both sides of the opening edge are long pieces extending over substantially the entire length of each opening edge. The metal filter according to claim 2 or 3, wherein the height dimension of the standing piece provided on both sides of the opening edge portion is substantially half the dimension in the width direction orthogonal to the row direction of the through groove. The metal filter according to claim 4, wherein the upright piece is a cut-up piece. The metal filter according to any one of claims 1 to 5, wherein a plurality of through grooves are provided in the mountain portion or the valley portion at intervals in the row direction. The method for manufacturing a metal filter according to any one of claims 1 to 6.
A method for manufacturing a metal filter in which an upright piece is formed by punching and raising at the same time when an uneven shape composed of peaks and valleys is formed by press working, thereby forming a through groove.

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