JP2004084991A - Louver-like structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a louver-like structure capable of reducing wind noise in a louver constituted by arranging fins having a cross sectional shape other than a rectangular shape in parallel. <P>SOLUTION: In this louver-like structure constituted by arranging a plurality of fins 10 having the cross sectional shape other than the rectangular shape in parallel to provide ventilation property, a projection 11 having a smooth curved face is provided along the parallel direction in an end part on a side where wind of each fin 10 blows. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a wind noise prevention structure for a louver-like structure. A louver-like structure is one in which a plurality of almost flat, elongated fins (blades) are arranged in parallel in the vertical or horizontal direction for the purpose of adjusting the sunshine of a building, covering or blinding air supply / exhaust ports, etc. It is. This louver-like structure includes eaves, fences, handrails, louvers, and the like, in addition to louvers.
[0002]
[Prior art]
In a louver-like structure such as a louver of a building, a veranda's handrail, or a louver, slender fins (feathers in a louver, handrails in a handrail, armor plates in a louver) are arranged in parallel at a fixed interval, and wind flows between the fins. Pass.
[0003]
When the wind passes through such a louver-like structure, wind noise and vibration are generated according to the wind direction and the wind speed. Such wind noise is unpleasant noise.
[0004]
Regarding such wind noise, the inventors of the present application have proposed that fins such as louver blades and handrail handrails are provided with projections at specific positions along the longitudinal direction, thereby reducing wind noise. We found it in an experiment and proposed it as a wind noise prevention structure. The wind noise prevention structure found in such an experiment is for a louver-like structure such as a louver or handrail having a flat fin and a rectangular (rectangular) cross section.
[0005]
[Problems to be solved by the invention]
However, with the diversification of the design of a building, the fins of the louver-like structure have a cross-sectional shape other than a simple flat rectangle, for example, an elongated trapezoid or a rhombus. In the case where such a fin other than a rectangular fin is used, the effect of reducing the wind noise is not always obtained even if the projection for the rectangular fin is applied as it is.
[0006]
The present invention has been made in consideration of the above points, and has as its object to provide a louver-like structure in which wind noise is reduced in a louver or the like in which fins having a cross-sectional shape other than a rectangle are arranged in parallel.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, according to the present invention, in a louver-shaped structure having a plurality of fins having a cross-sectional shape other than a rectangular shape arranged in parallel and having ventilation, an end of each fin on the side where the wind hits And a louver-like structure provided with a projection having a smooth curved surface along the parallel direction.
[0008]
According to this configuration, the end on the side where the wind of the fins having an irregular shape other than the rectangle hits, that is, on the outer end of the louver-shaped structure provided on the outer wall surface of the building, for example, the wind passes. By providing a projection having a smooth curved surface along the longitudinal direction of the fin at a portion that becomes an edge when the wind is involved and winds are formed, wind noise is reduced. This has been confirmed by experiments.
[0009]
In a preferred configuration example, in the cross section of each of the fins, the protrusion is provided on both sides in the thickness direction of the end on the side where the wind hits.
[0010]
According to this configuration, by providing projections on both ends in the thickness direction at the end of the fin where the wind hits, it is possible to effectively reduce wind noise even when the wind direction changes.
[0011]
In a further preferred configuration example, in the cross section of each of the fins, the protrusion is provided at an end opposite to the end on which the wind hits.
[0012]
According to this configuration, for example, in the case of a louver-like structure such as a fence, the surfaces receiving the wind are both surfaces depending on the wind direction, and both ends of each fin are the ends on the wind receiving side. In such a case, by providing a projection on one end to which one wind hits and also providing a projection on the opposite end, wind noise can be effectively reduced regardless of the wind direction.
[0013]
BEST MODE FOR CARRYING OUT THE INVENTION
FIG. 1 is a front view of the entire louver to which the present invention is applied.
The louver 1 has a plurality of fins 2 arranged in parallel in a horizontal direction, and allows air to pass through gaps between the fins 2 so as to have air permeability. Each fin 2 is fixed to the left and right frame members 3 and, if necessary, to a support frame (not shown) on the back side. Such a louver 1 is attached to cover a necessary portion of an outer wall surface of a building, or as a fence, an eave, or the like. The louver 1 can be mounted vertically so that the fins 2 are arranged in the vertical direction.
Each fin 2 has a flat shape, and its cross-sectional shape is not a mere rectangular cross-section plate material but an irregular shape in order to enhance the design effect.
[0014]
2A to 2D show examples of the cross-sectional shape of the fin 2. Each example shows a basic outline shape, and a drainer or the like may be added to the end of the basic shape. When actually manufacturing, it is manufactured by extrusion molding of an aluminum alloy or the like. Therefore, the cross section is hollow, and a water drainage piece (not shown) and a groove (not shown) through which a mounting screw is inserted are formed integrally in the longitudinal direction.
[0015]
Each of the fins has an irregular cross-sectional shape other than a mere rectangular cross-section, and in this state, a specific wind noise is generated when wind passes between the fins. In the present invention, when the louver is attached to a building, a projection is provided along the longitudinal direction of the fin (perpendicular to the drawing) at the end in the direction in which the wind hits, that is, at the positions a, b or c, d in the drawing. . These projections provide a soundproofing effect (effect of suppressing wind noise). This projection is a projection having a smooth curved surface such as a semicircular cross section. Such projections are preferably provided on both sides (both a and b or both c and d) in the thickness direction of the fin at each end, so that a soundproof effect in all wind directions can be obtained. However, a soundproofing effect can be obtained even if only one side is provided. In addition, it may be provided only at one of the left and right ends (a and b sides or c and d sides) in the cross section of the fin, but if it is provided at both ends, the wind may hit the louver from both directions (fence) Etc.) to increase the soundproofing effect.
It has been confirmed by experiments that the effect of suppressing wind noise can be obtained by such projections.
[0016]
3 and 4 show the cross-sectional shapes of the louver fins used in the wind noise experiment. The experiment was performed by using a fin having a basic shape corresponding to the shape shown in FIG. FIGS. 3A, 3B, and 3C are cross-sectional views of the original fin, processed 1 fin, and processed 2 fin, respectively, and FIGS. 4D and 4E are processed 3 fins, respectively. And FIG. 4 is a cross-sectional view of a fin.
[0017]
The fin 10 in FIG. 3A is an original fin in a prototype state having no wind noise preventing projection. The actual fin is a hollow extruded body, and the drainer 12 and a mounting groove (not shown) are integrally formed.
[0018]
The fin 10 shown in FIG. 3B is obtained by processing the original fin shown in FIG. 3A by processing (1) in which a projection 11 having a semicircular cross section is provided on the lower side in the view of one end in the fin cross section. It is. The protrusion 11 is formed continuously along the longitudinal direction of the fin 10 (perpendicular to the drawing). In practice, it is integrally extruded with the fins 10. When it is installed on the site as a louver or the like, the side with the projection 11 is disposed on the side where the wind hits. When the fin 10 receives the wind, the wind is entrained at the edge thereof to form a vortex, which is considered to generate a wind noise. By providing the projection 11 having a semicircular cross-section at such an edge portion, it is considered that the wind smoothly flows through the edge portion, thereby suppressing the generation of sound.
[0019]
The shape of the projection 11 is not limited to a semi-circular cross section, and may be a projection having a semi-elliptical cross-sectional shape or another smooth curved surface shape. (Dent causes noise).
[0020]
The fin 10 of FIG. 3 (C) has a projection 11 having a semicircular cross-sectional shape on the lower side in the drawing of one end in the fin cross section, and an opposite end (the side where the drainer 12 is integrally formed). (The end of FIG. 2) is a fin that has been processed (2) in which a projection 11 having a semicircular cross section is also provided on the upper side. By providing the projections 11 at the edge of the opposite end as well, for example, when used as a fence or the like through which wind passes, it is possible to effectively reduce wind noise for wind in both directions. it can.
[0021]
The fin 10 in FIG. 4D is a fin that has been processed (3) in which projections 11 having a semicircular cross-sectional shape are provided on both upper and lower sides in a view of one end of the fin cross section. When it is installed on the site, the side with the projection 11 is arranged on the side where the wind hits, as in FIG. 3B. Since the projections 11 are provided on both sides in the thickness direction of the fin, the wind noise can be effectively reduced regardless of whether the wind direction is obliquely above or below the fin.
[0022]
The fin 10 of FIG. 4 (E) has projections 11 having a semicircular cross-sectional shape on both upper and lower sides in a view of one end in the fin cross-section, and a semi-circular cross-section also on the upper side in a view of the opposite end. These are fins provided with a processing (4) provided with a shape projection 11. By providing the projection 11 also at the edge of the opposite end in this way, as in the case of FIG. Thus, wind noise can be effectively reduced.
[0023]
An experiment was conducted in which a louver was formed using the fins subjected to the above processes (1) to (4), and the noise level was measured by changing the surface and direction of the wind and the wind speed. As a result, in any of the processings (1) to (4), the wind noise is reduced or almost eliminated, and the effect of the wind noise reduction can be obtained by providing the projection on the fin having the irregular cross-sectional shape. confirmed. The following shows some of the experimental results.
[0024]
FIG. 5 shows one form of the experiment. The fins 10 were arranged upward to form a louver, and the wind W was blown obliquely downward at an angle of 55 ° (0 ° immediately beside and 90 ° immediately below) to measure the noise level.
The dimensions are a = 100 mm, b = 100 mm, c = 115 mm, and d = 175 mm in the figure.
[0025]
FIGS. 6 to 9 show noises in the case of the original fin, the processing (1) fin, the processing (2) fin and the processing (3) fin in FIG. 4 (D), respectively. It is a graph which shows a level. As can be seen from the graph, the wind noise is reduced in each of the processings (1) to (3) as compared with the original fin having no projection. Regarding the processing (4), it has been confirmed that the wind noise is not a problem.
[0026]
Furthermore, it was confirmed that the wind noise was further reduced by chamfering or curving the sharply bent edge portion in the cross section of each fin so as to be flat or round.
[0027]
10 and 11 are diagrams showing other examples of the shape of the louver, where (A) is a front view, (B) is a side view, and (C) is a top view. FIGS. 12A to 12F are cross-sectional views showing examples of fin shapes.
[0028]
In the example of FIG. 10, a plurality of (seven in this example) fins 13 are arranged in parallel so as to be horizontally long. Each fin 13 is fixed to a vertical frame 14 with bolts 15 on the rear surfaces at both left and right ends.
[0029]
Each fin 13 has an obliquely upward shape in the figure, and a drainer 12 is formed at the root as shown in FIGS. Each fin 13 is an extruded body made of an aluminum alloy or the like, and has a groove 17 formed on the back side for inserting a fin mounting bolt. Reference numeral 18 denotes a screw hole at the end of the fin. Projections 19 having a semicircular cross-section are formed at a total of three places on both sides of a front end (right end in the figure) of each fin 13 on the side where the wind hits, and below the drainer 12 at the opposite end. You.
[0030]
In addition, such a louver may be arranged upside down (that is, each fin is obliquely downward). Further, the drainer 12 may be omitted. When the draining is omitted, the projections 19 are formed at the ends of the fins themselves.
[0031]
In the example of FIG. 11, the fins 16 themselves are substantially horizontal unlike the example of FIG. 10 (inclined upward), and a plurality of such horizontal fins 16 are arranged horizontally. As shown in FIG. 12 (F), the fin 16 has projections 20 having a semicircular cross section on both sides of the front end of the semicircular cross section.
[0032]
【The invention's effect】
As described above, according to the present invention, in the louver-shaped structure made of fins having irregular shapes other than rectangles, the louver-shaped structure provided on the end of the fin exposed to the wind, that is, the outer wall surface of the building If, at the end on the outer surface side, for example, by providing a projection having a smooth curved surface along the longitudinal direction of the fin, at the part that becomes an edge when the wind passes and winds in and forms a vortex, Wind noise is reduced.
[0033]
In this case, in the cross-section of each fin, according to the configuration in which the protrusions are provided on both sides in the thickness direction of the end on the side where the wind hits, wind noise can be effectively reduced even when the wind direction changes. .
[0034]
Furthermore, in the cross section of each fin, according to the provision of the protrusion at the end opposite to the end on which the wind hits, for example, in the case of a louver-like structure such as a fence, the surface receiving the wind depends on the wind direction. On both sides, both ends of each fin are wind-receiving ends. In such a case, by providing a projection on one end to which one wind hits and also providing a projection on the opposite end, wind noise can be effectively reduced regardless of the wind direction.
[Brief description of the drawings]
FIG. 1 is a front view of a louver to which the present invention is applied.
FIG. 2 is a sectional view showing an example of the shape of a louver fin.
FIG. 3 is an explanatory diagram of a shape of a fin used in an experiment.
FIG. 4 is a diagram illustrating the shape of a fin used in an experiment.
FIG. 5 is an explanatory diagram of a shape of a louver used in an experiment.
FIG. 6 is a graph of an experimental result of an original fin.
FIG. 7 is a graph showing experimental results of a fin having a processing (1) shape.
FIG. 8 is an experimental result graph of a fin having a processing (2) shape.
FIG. 9 is a graph showing experimental results of a fin having a processing (3) shape.
FIG. 10 is a shape diagram of another example of the louver.
FIG. 11 is a shape diagram of still another example of the louver.
FIG. 12 is a cross-sectional view of another example of a fin.
[Explanation of symbols]
1: louver, 2: fin, 3: frame material, 10: fin, 11: protrusion,
12: drainer, 13: fin, 14: vertical frame, 15: bolt, 16: fin,
17: groove, 18: screw hole, 19: projection, 20: projection.

Claims (3)

In a louver-like structure in which a plurality of fins having a cross-sectional shape other than a rectangle are arranged in parallel to provide ventilation,
A louver-like structure, wherein a projection having a smooth curved surface is provided along an end of the fin on a side where the wind hits, in the parallel direction. 2. The louver-like structure according to claim 1, wherein, in a cross section of each of the fins, the protrusion is provided on both sides in a thickness direction of an end on a side where the wind hits. 3. The louver-like structure according to claim 1, wherein the protrusion is provided at an end of the cross section of each of the fins opposite to the end on which the wind hits. 4.

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