Sunshade device

Abstract

To provide a solar radiation shielding device capable of effectively suppressing the amount of solar radiation reaching the inside of a room without impairing visibility from the inside of a building.SOLUTION: A solar radiation shielding device 1 which covers at least a part of an opening 5 of a building 2 to shield solar radiation light traveling toward the interior of the building includes: an inner light-shielding plate 10 disposed outside the opening 5; and an outer light-shielding plate 20 disposed outside the inner light-shielding plate with a clearance d1 from the inner light-shielding plate. The outer light-shielding plate 20 has a plurality of outer through holes 21, the inner light-shielding plate 10 has a plurality of inner through holes 11 smaller than the outer through holes, and the inner through holes 11 are formed inside the outer through holes 21 when viewed from a horizontal direction.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present invention relates to a solar shading device, and more particularly to a solar shading device that covers at least a portion of an opening of a building and is provided with a shading plate that blocks sunlight entering a room. [Background technology]

[0002] As this type of technology, a solar shading device that covers an opening of a building and blocks solar radiation entering the room is known (for example, Patent Document 1). This solar shading device includes a thin plate with multiple through holes, one side of which in the thickness direction faces the room and the other side faces the outside, and a frame that holds the periphery of the thin plate. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2014-237982 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the solar shading device of Patent Document 1, if the diameter of the multiple through holes formed in the thin plate is reduced in order to increase the solar shading effect and suppress the rise in temperature inside the building, the view to the outside scenery is impaired. Also, in order to increase the view, it is necessary to increase the diameter of the multiple through holes, which results in a loss of the solar shading effect and a large rise in temperature inside the building.

[0005] The present invention has been made in view of the above, and an object of the present invention is to provide a solar shading device that enhances the solar shading effect without impairing the view. [Means for solving the problem]

[0006] In view of the above-mentioned problems, the inventors conducted extensive research and came to the conclusion that by arranging two plates, an inner shading plate with multiple inner through holes and an outer shading plate with multiple outer through holes, so as to cover at least a portion of the opening of a building, and by forming the inner through holes inside the outer through holes when viewed from the horizontal direction, it is possible to prevent impairment of the view from the opening and effectively reduce the amount of solar radiation.

[0007] The present invention is based on this idea, and the solar shading device of the present invention is a solar shading device that covers at least a portion of an opening of a building and blocks solar radiation directed toward the interior of the building, and is characterized in that it comprises an inner shading plate arranged outside the opening, and an outer shading plate arranged outside the inner shading plate with a gap between it and the inner shading plate, the outer shading plate having a plurality of outer through holes, the inner shading plate having a plurality of inner through holes smaller than the outer through holes, and the inner through holes are formed inside the outer through holes when viewed from the horizontal direction.

[0008] According to the present invention, the multiple inner through holes are formed inside the multiple outer through holes that are larger than the multiple inner through holes when viewed from the horizontal direction, so that the outside can be viewed from inside the room at a wide viewing angle through the multiple inner through holes of the inner shading plate and the multiple outer through holes of the outer shading plate. Furthermore, the sunlight that passes through the multiple outer through holes of the outer shading plate is easily blocked by the surrounding areas except for the multiple inner through holes of the inner shading plate, so the amount of sunlight entering the room can be reduced.

[0009] In a more preferred embodiment, the outer through hole and the inner through hole are formed so that, during a specified period throughout the year, including the day on which the solar altitude is highest in the year, sunlight passing through the outer through hole due to the sun's orbit during that period irradiates only the surface of the inner shading plate that is outside the inner through hole.

[0010] According to this embodiment, during a period throughout the year including the day when the solar altitude is the highest (for example, during the summer), the sunlight that has passed through the outer through-holes of the outer shading plate is irradiated only onto the surface of the inner shading plate excluding the inner through-holes of the inner shading plate, and is blocked by the inner shading plate. This makes it possible to prevent direct sunlight from entering the room through the outer through-holes and the inner through-holes.

[0011] Here, by forming the outer through hole and the inner through hole so that, relative to the annual orbit of the sun, sunlight passing through the outer through hole only irradiates the surface of the inner shading plate that is outside the inner through hole, it is possible to prevent sunlight from passing through the opening throughout the year.

[0012] Furthermore, when the day with the highest solar altitude (summer solstice), the day with the lowest solar altitude (winter solstice), the first intermediate day (vernal equinox) on which the solar altitude is in the middle (center) position between the low day (winter solstice) and the high day (summer solstice), and the second intermediate day (autumn equinox) on which the solar altitude is in the middle (center) position between the high day (summer solstice) and the low day (winter solstice), the outer through hole and the inner through hole may be formed as follows. Specifically, the outer through hole and the inner through hole are formed so that the sunlight passing through the outer through hole irradiates only the surface of the inner light shielding plate that is out of the inner through hole with respect to the solar orbit from the first intermediate day (vernal equinox) to the second intermediate day (autumn equinox). As a result, since the period between the first midday (vernal equinox) and the second midday (autumn equinox) is longer than other days in a year, it is possible to block sunlight during this period and allow some of the sunlight during other periods to enter the room.

[0013] In a further preferred embodiment, the angle between the horizontal line and an imaginary line connecting the shortest distance between the opening edge of the inner through-hole and the opening edge of the outer through-hole is 20° or more and 40° or less. According to this embodiment, since the effective viewing angle of a human being gradually widens toward the distance, the relationship between the opening edges of the inner through-holes located on the indoor side and the opening edges of the outer through-holes located on the outside can be made as described above, thereby improving the visibility. Here, if this angle is less than 20°, the angle becomes narrower than the effective viewing angle of a human being, and the visibility may be reduced. On the other hand, if this angle exceeds 40°, the outer through-hole is too large, and sunlight easily passes through the inner through-hole.

[0014] In a further preferred embodiment, the inner through holes and the outer through holes are arranged at a staggered pitch, where the staggered pitch means that the inner through holes and the outer through holes are arranged at a constant pitch in the horizontal and vertical directions, and the outer through holes in adjacent rows and columns are shifted by half a pitch along the horizontal and vertical directions.

[0015] According to this embodiment, on the path of the sun on the day when the sun's altitude is the highest (the summer solstice), the solar radiation that passes through the outer through-hole is easily irradiated onto the surrounding surface without passing through the inner through-hole of the inner shading plate. On the other hand, on the path of the sun on the day when the sun's altitude is the lowest (the winter solstice), a part of the solar radiation that passes through the outer through-hole can be passed through the inner through-hole of the inner shading plate and taken into the room.

[0016] In a further preferred embodiment, the inner through-holes and the outer through-holes are arranged at equal intervals in the horizontal direction and at equal intervals in the vertical direction, and the horizontal pitch is set smaller than the vertical pitch. Even in this embodiment, by arranging the outer through-holes and the inner through-holes with a wide vertical pitch and a narrow horizontal pitch, it is possible to efficiently block sunlight and improve visibility. Effect of the Invention

[0017] According to the present invention, the amount of solar radiation reaching a room can be effectively reduced without impairing the view from inside the building. [Brief description of the drawings]

[0018] [Figure 1] 1A and 1B are schematic diagrams showing a solar shading device according to the present embodiment, in which FIG. [Diagram 2] FIG. 2 is a plan view of the solar shading device shown in FIG. [Diagram 3] 3 is a perspective view showing a schematic exploded state of a pair of inner and outer shading plates constituting the solar shading device shown in FIGS. 1 and 2. FIG. [Figure 4] 2(a) is a cross-sectional view of the essential parts of the inner through holes and outer through holes formed in the inner shading plate and outer shading plate that constitute the solar shading device shown in FIG. 1, and (b) is a front view of the essential parts showing the arrangement of the inner through holes and outer through holes. [Diagram 5] 2 shows the fixing structure of the solar shading device shown in FIG. 1, where (a) is a left side view of the main part of part A in FIG. 1, (b) is a left side view of the main part of part B in FIG. 1, (c) is a left side view of the main part of part C in FIG. 1, (d) is a plan view of the main part of part D in FIG. 1, (e) is a cross-sectional view of the main part along line EE in FIG. 1, and (f) is a bottom view of the main part of part F in FIG. 1. [Figure 6] 1A and 1B are explanatory diagrams showing the state when sunlight is irradiated onto the solar shading device of this embodiment, where (a) is a diagram showing a case where sunlight that has passed through the outer through hole cannot pass through the inner through hole, (b) is a diagram showing a case where sunlight that has passed through the outer through hole can pass through the inner through hole, (c) is a diagram showing the field of view when there are multiple inner through holes with a smaller diameter than the multiple outer through holes, and (d) is a diagram showing the field of view when there are multiple inner through holes with the same diameter as the multiple outer through holes in a solar shading device that is compared to this embodiment. [Figure 7] 1A and 1B show an illumination range on an inner light-shielding plate passing through one outer through-hole formed in an outer light-shielding plate, where (a) is an explanatory diagram of this embodiment and (b) is an explanatory diagram of another example. [Figure 8] FIG. 11 is a front view of another embodiment of a solar shading device. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0019] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. Unless otherwise specified, configurations with the same reference numerals in each embodiment have the same functions in each embodiment, and their description will be omitted. FIG. 1(a) shows a front view of the main part of a building equipped with a solar shading device of this embodiment, and shows a part in a schematic manner. FIG. 1(b) is a right side view thereof, and FIG. 2 is a bottom view thereof. FIG. 3 is a perspective view showing a disassembled state of a pair of inner and outer shading plates in FIG. 1. FIG. 4(a) is a cross-sectional view of the main part of the inner through hole and the outer through hole, and FIG. 4(b) is a front view of the main part showing the arrangement of the inner through hole and the outer through hole.

[0020] In Fig. 1, a solar shading device 1 according to this embodiment is a device that covers at least a part of an opening 5 of a building 2 and blocks sunlight heading toward the interior of the building 2 through the opening 5. The building 2 is a structure such as a house or a warehouse, and is made of wood, steel frame, or concrete, and is appropriately constructed as a single-story or multi-story building. The building 2 has an exterior wall 3 that forms the periphery of the structure, and the opening 5 is formed by penetrating the exterior wall 3, and sunlight is taken into the interior. The opening 5 may be equipped with a recessed window glass or a sliding window glass.

[0021] The building 2 to which the solar shading device 1 is applied has an opening 5 penetrating an exterior wall 3 configured in a panel shape, and is configured as a simple opening without a glass door or the like. The solar shading device 1 of this embodiment has two flat shading plates installed in parallel on the outside of the opening 5. Specifically, the solar shading device 1 has an inner shading plate 10 arranged outside the opening 5, and an outer shading plate 20 arranged outside the inner shading plate 10 with a gap d1 between it and the inner shading plate 10. The outer shading plate 20 is fixed to the exterior wall 3 of the building 2 with a gap d2 between them.

[0022] In this embodiment, the outer shading plate 20 is made of a metal plate material such as aluminum or steel, and is composed of four outer shading plates 20A, 20B, 20C, and 20D arranged vertically and horizontally. For example, one shading plate is about 4 m long and 1.5 m wide, and its plate thickness is about 1 to 2 mm. The outer shading plate 20 has a plurality of outer through holes 21 penetrating the plate material. The opening 5 formed in the exterior wall 3 of the building 2 is formed in a rectangular shape when viewed from the front, which is slightly smaller than the area of ​​the four outer shading plates 20 and the inner shading plate 10.

[0023] The outer through-holes 21 are formed in a total of 51 holes, for example, in 17 rows of three holes in the horizontal direction in one outer light-shielding plate 20A. In this embodiment, each outer through-hole 21 is formed in a circular shape, and as shown in FIG. 4, the diameter Wout is set in the range of about 50 mm to 400 mm, preferably in the range of 50 mm to 320 mm, and more preferably in the range of 50 mm to 270 mm. In this embodiment, for example, it is set to 52.3 mm. The outer through-holes 21 are not limited to being circular, and may be formed in an appropriate shape such as a square, a diamond, or a star. In this specification, the "horizontal direction" has the same meaning as the horizontal direction along the opening 5, and the "vertical direction" has the same meaning as the vertical direction perpendicular to the "horizontal direction".

[0024] In this embodiment, the multiple outer through holes 21 are arranged at a staggered pitch. The staggered pitch means that the multiple outer through holes 21 are arranged at a constant pitch in the horizontal and vertical directions, and the multiple outer through holes 21 are arranged such that the outer through holes 21 in adjacent rows and columns are shifted by half a pitch along the horizontal and vertical directions, as shown in FIG.

[0025] Specifically, as shown in Fig. 3, in a specific region, three outer through holes 21 are arranged at a pitch Ph along the horizontal direction, and each group of three outer through holes 21 adjacent in the vertical direction is shifted by half a pitch (Ph / 2) in the horizontal direction. Also, when viewed in the vertical direction, eight or nine outer through holes 21 are arranged at a pitch Pv along the vertical direction. Each group of eight or nine outer through holes 21 adjacent in the left-right direction is shifted by half a pitch (Pv / 2) in the vertical direction. In this way, when the four nearest outer through holes 21 are selected so as to be the four corners of a rectangle along the vertical and horizontal directions, an outer through hole 21 is formed in the center of the rectangle.

[0026] The inner light shielding plate 10 is also made of a metal plate such as aluminum or steel, and is composed of four inner light shielding plates 10A, 10B, 10C, and 10D arranged vertically and horizontally. For example, one light shielding plate is about 4 m long and 1.5 m wide, and its plate thickness is about 1 to 2 mm. The inner light shielding plate 10 also has a plurality of inner through holes 11 that penetrate the plate material. The dimensions and plate thickness of the outer light shielding plate 20 and the inner light shielding plate 10 can be set appropriately, and are not limited to the above dimensions and plate thickness.

[0027] The multiple inner through holes 11 are also arranged at a staggered pitch. Each inner through hole 11 is circular and smaller than the outer through holes 21, with a size of about 10 to 40 mm. The multiple inner through holes 11 are formed at the same pitch and in the same position as the multiple outer through holes 21, and are formed inside the multiple outer through holes 21 when viewed from the normal direction (horizontal direction) of the outer shading plate 20 on the outside of the building. Therefore, when the two outer shading plates 20 and the inner shading plate 10 arranged in parallel with a gap d1 are viewed from the horizontal direction, the multiple outer through holes 21 and the multiple inner through holes 11 are configured to look like double circles with the same center (see FIG. 4(b)). Note that the multiple outer through holes 21 and the multiple inner through holes 11 are not limited to circles, and may be formed in any suitable shape such as a square, a diamond, or a star.

[0028] Here, an example of the relationship between the size of one outer through hole 21 and one inner through hole 11, the pitch between the multiple outer through holes 21 and the multiple inner through holes 11, and the gap between the inner light shielding plate 10 and the outer light shielding plate 20 will be briefly described below. Using the diameter Win of the inner through hole 11 as a reference, the diameter Wout of the outer through hole, the gap d1 between the inner light shielding plate 10 and the outer light shielding plate 20, the horizontal pitch Ph between the multiple inner through holes 11 and the outer through holes 21, and the vertical pitch Pv will be considered.

[0029] Considering the above points, d1 = 1.4 × Win (1) Wout=Win×2×d1×tan30°=2.616×Win...(2) Ph = Pv = 8 × Win · · · (3) The following relation is assumed:

[0030] In this embodiment, each of the inner through holes 11 and each of the outer through holes 21 is formed in a circular shape, and for example, the diameter Win of the multiple inner through holes 11 is set to 20 mm. From equation (1), the gap d1 between the inner light shielding plate 10 and the outer light shielding plate 20 is 28 mm, from equation (2), the diameter Wout of the outer through hole 21 is approximately 52.3 mm, and from equation (3), the horizontal pitches Ph, Pv of the multiple outer through holes 21 and the multiple inner through holes 11 are 160 mm.

[0031] The angle θ between the horizontal line L2 and an imaginary line L1 that connects the shortest distance between the opening edge of the inner through hole 11 and the opening edge of the outer through hole 21 is preferably 20° or more and 40° or less (within the range of 20° to 40°), and is set to 30° in formula (2). This angle θ corresponds to the spread angle along the gap d1 from the opening edge of the inner through hole 11 to the opening edge of the outer through hole 21.

[0032] The effective viewing angle of a human being gradually widens toward the distance, and the diameter Wout of the multiple outer through-holes 21 located on the outside is made larger to widen at an angle in the range of 20° to 40° (for example, 30°) relative to the diameter Win of the multiple inner through-holes 11 located on the indoor side, across the gap d1. This widens the viewing field when viewing the outside scenery from inside the building 2 through the opening 5, the inner through-hole 11, and the outer through-hole 21, thereby improving the visibility.

[0033] If the angle θ is less than 20°, the outer through-hole 21 located far from the inner through-hole 11 will not spread out as much, and sufficient visibility will not be obtained. On the other hand, if the angle θ exceeds 40°, the outer through-hole will be too large, and sunlight will easily pass through the inner through-hole.

[0034] Next, the mounting structure of the solar shading device 1 of this embodiment to the building 2 will be described with reference to Fig. 5. As described above, the solar shading device 1 is a device that covers at least a part of the opening 5 of the building 2 and blocks solar radiation heading toward the interior of the building 2 through the opening 5. The solar shading device 1 includes an inner shading plate 10 arranged outside the opening 5, and an outer shading plate 20 arranged outside the inner shading plate 10 with a gap d1 between it and the inner shading plate 10.

[0035] Furthermore, the outer shading plate 20 has a plurality of outer through holes 21, and the inner shading plate 10 has a plurality of inner through holes 11 that are smaller than the outer through holes 21. The inner through holes 11 and the outer through holes 21 are formed at the same pitch and at the same positions, so that the inner through holes 11 are formed inside the outer through holes 21 when viewed from the horizontal direction. In this embodiment, the outer through holes 21 and the inner through holes 11 are both circular, and when viewed from the outside of the building in the horizontal direction (the normal direction of the outer through holes 21), the periphery of the larger diameter outer through hole 21 is located around the smaller diameter inner through hole 11, and they appear to be in the shape of concentric double circles.

[0036] Angle plates 12 with an L-shaped cross section are fixed to the top and bottom of each of the four inner shading plates 10A, 10B, 10C, 10D located near the opening 5 of the building 2. Two angles 12 are fixed to the top and bottom of each inner shading plate 10, for a total of eight angles 12. The angles 12 are fixed to the outer periphery of the opening 5 with multiple brackets 13. The multiple brackets 13 are fixed to the exterior wall 3 that constitutes the building 2 with anchor bolts.

[0037] The bracket 13 includes two lower end brackets 13A that support the lower portions of the lower inner shading plates 10C and 10D, and one lower center bracket 13B (see FIG. 2). The bracket 13 also includes two central end brackets 13C that support the central connecting portions of the four inner shading plates 10A, 10B, 10C, and 10D, and one central center bracket 13D. The bracket 13 also includes two upper end brackets 13E and one upper center bracket 13F that support the upper portions of the upper inner shading plates 10A and 10B.

[0038] Each of the six end brackets 13A, 13C, and 13E has one bolt hole formed therein for supporting an end of the angle 12, and each of the three center brackets 13B, 13D, and 13F has two bolt holes formed therein for supporting both ends of the angle 12.

[0039] To the outside of the four inner shading plates 10A, 10B, 10C, 10D, grooved members 22 having a U-shaped cross section are fixed in order to fix the four outer shading plates 20A, 20B, 20C, 20D. That is, the eight grooved members 22 are fixed with bolts and nuts so as to face the eight angles 12 for fixing the four inner shading plates 10A, 10B, 10C, 10D to the outer wall 3. The four outer shading plates 20A, 20B, 20C, 20D are fixed to the outside of the eight grooved members 22 with bolts and nuts.

[0040] In this way, eight angles 12 are arranged horizontally on multiple brackets 13 fixed around the periphery of the opening 5 of the building 2, and four inner shading plates 10 are fixed to the angles 12 with bolts and nuts, forming a gap d2 between the inner shading plates 10 and the exterior wall 3. In addition, eight grooved members 22 are arranged on the outside with the four inner shading plates 10 sandwiched between the angles 12, and four outer shading plates 20 are sandwiched between them and fixed with bolts and nuts. This sets a gap d1 between the four outer shading plates 20 and the four inner shading plates 10.

[0041] Therefore, a gap d2 is formed between the exterior wall 3 and the four inner shading plates 10, and a gap d1 is formed between the four inner shading plates 10 and the four outer shading plates 20, and the solar shading device 1 is fixed to the building 2. In this way, the spaces of the gaps d1 and d2 are formed between the exterior wall 3 of the building 2 and the inner shading plates 10 and outer shading plates 20, thereby improving the thermal insulation performance and making it possible to suppress a temperature rise inside the building 2 due to solar radiation.

[0042] The operation of the solar shading device 1 of this embodiment configured as described above will be described with reference to Fig. 6 and Fig. 7. Fig. 6 is an explanatory diagram of the solar shading device 1 of this embodiment when solar radiation is irradiated, and an explanatory diagram of the viewing angle, and Fig. 7 is an explanatory diagram of one example of the irradiation range on the inner shading plate passing through one outer through-hole 21 formed in the outer shading plate 20, and another example.

[0043] 6 , a portion of the sunlight passes through the multiple outer through-holes 21 of the outer shading plate 20 of the sunlight shading device 1, and the remaining sunlight is irradiated to the outer peripheral areas of the multiple outer through-holes 21 and cannot pass through the outer shading plate 20. In other words, only the sunlight that is equivalent to the total opening area of ​​the multiple outer through-holes 21 can pass through the outer shading plate 20 relative to the surface area of ​​the outer shading plate 20.

[0044] FIG. 6(a) shows a predetermined period (period including the summer solstice) including the day when the solar altitude is the highest throughout the year. In FIG. 6(a), the position of the sun is relatively high compared to FIG. 6(b), and the sun is incident at an angle α1. At this angle α1, the solar radiation that passes through the multiple outer through-holes 21 is prevented from passing by the outer periphery of the multiple inner through-holes 11 of the inner shading plate 10 located on the inside. That is, the outer through-holes 21 and the inner through-holes 11 are formed so that the range of the solar radiation that passes through the outer through-holes 21 due to the orbit of the sun during this period irradiates only the surface of the inner shading plate 10 that is outside the inner through-hole 11. For this reason, the solar radiation cannot pass through the multiple inner through-holes 11 of the inner shading plate 10.

[0045] On the other hand, in FIG. 6(b), the solar altitude is, for example, during the winter season, and compared to FIG. 6(a), the position of the sun is relatively low and the sun is incident at an angle α2. At this angle α2, the solar radiation that passes through the multiple outer through-holes 21 is partially blocked at the outer periphery of the multiple inner through-holes 11 of the inner shading plate 10 located on the inside, and some of the solar radiation passes through the multiple inner through-holes 11 of the inner shading plate 10. In FIG. 6(b), if the amount of solar radiation passing through the outer through-hole 21 is shown by the cross-sectional area Sa, the amount of solar radiation passing through the inner through-hole 11 is shown by the cross-sectional area Sb, and it can be seen that a considerable amount of solar radiation is blocked. In this way, the height position of the sun changes depending on the trajectory of the sun's movement, so the amount of solar radiation that passes through the multiple outer through-holes 21 of the outer shading plate 20 and further passes through the multiple inner through-holes 11 of the inner shading plate 10 changes depending on the time.

[0046] Next, a case where the outside scenery is viewed from inside the building 2 will be described with reference to Fig. 6(c). In the solar shading device 1 of this embodiment, the multiple inner through-holes 11 of the inner shading plate 10 are small compared to the multiple outer through-holes 21 of the outer shading plate 20. When looking outside with the human eye, the view is from the small inner through-hole 11 through the relatively large outer through-hole 21, so that the viewing angle when looking at the upper outer through-hole 21a through the upper inner through-hole 11a is β1. Also, the viewing angle when looking at the lower outer through-hole 21b through the lower inner through-hole 11b is β2.

[0047] In contrast, in the comparative example of FIG. 6(d), the inner through-hole 11 of the inner light-shielding plate 10 and the multiple outer through-holes 26 of the outer light-shielding plate 25 are the same size. In this case, the viewing angle β3 in the case of the upper inner through-hole 11a and the outer through-hole 26a is smaller than the viewing angle β1 in FIG. 6(c). This is because the outer through-hole 26 is small and blocks the viewing angle. In addition, the viewing angle β4 seen through the lower inner through-hole 11b and the lower outer through-hole 26b is also smaller than the viewing angle β2 in FIG. 6(c).

[0048] In this way, when looking outward through the inner through hole 11 and the outer through hole 21, even if the inner through hole 11 is small, if the outer through hole 21 is large, the viewing angle is large, the field of view is widened, and the visibility is improved.

[0049] Next, the irradiation range passing through one outer through hole 21 of the outer light-shielding plate 20 will be described with reference to Fig. 7. In the embodiment of Fig. 7, the outer through hole 26 and the inner through hole 11 are formed so that the range of sunlight passing through the outer through hole 26 irradiates the surface of the inner light-shielding plate 11 outside the inner through hole 11.

[0050] 7(a) shows an irradiation range 30 where the sunlight that has passed through the outer shading plate 20 is irradiated onto the surface of the inner shading plate 10 in the solar shading device 1 of this embodiment. A trajectory 31 is the trajectory of the center of solar radiation aligned with the solar orbit on the summer solstice when the sun is at its highest point. The area between the nearly parallel trajectories 31a and 31b above and below the trajectory 31 is the irradiation area of ​​the sunlight that has passed through the outer through-hole 21 on the summer solstice.

[0051] In addition, the solar shading device 1 having the solar radiation irradiation range shown in Figure 7(a) has a diameter Wout of the outer through hole 21 shown in Figure 4 of 52.3 mm, a diameter Win of the inner through hole 11 of 20 mm, a gap d1 of 28 mm, and an angle between the imaginary line connecting the shortest distance between the opening edge of the outer through hole 21 and the opening edge of the inner through hole 11 and the horizontal line, i.e., an angle of expansion from the inner through hole 11 to the outer through hole 21, set to 30°.

[0052] In FIG. 7(a), the locus 32 indicates the locus of the solar radiation center aligned with the solar orbit on the vernal and autumnal equinoxes when the sun is in the middle position. The area between the almost parallel orbits 32a and 32b above and below the locus 32 is the irradiation area of ​​the solar radiation that passed through the outer through-hole 21 during the vernal and autumnal equinoxes. The locus 33 indicates the locus on the winter solstice when the sun is at its lowest position. From these irradiation ranges, the irradiation range of the solar radiation that passed through one outer through-hole 21 from the vernal equinox, through the summer solstice, to the autumnal equinox is the irradiation range 30. Note that in this example, the solar radiation area aligned with the locus 33 of the solar radiation center on the winter solstice, when it is not necessary to block the solar radiation and it is not necessary to prevent the winter solar radiation from entering the room, is not considered.

[0053] In this manner, in the present embodiment, by satisfying the above-mentioned formulas (1) to (3) as an example, in the period from the vernal equinox through the summer solstice to the autumnal equinox throughout the year, the sunlight passing through the outer through-hole 21 due to the orbit of the sun in this period can be irradiated only onto the surface of the inner shading plate 10 that is out of the inner through-hole 11. Therefore, the sunlight that passes through one outer through-hole 21 cannot pass through the four inner through-holes 11 on the inner periphery side, and the sunlight that passes through the solar shading device 1 cannot reach the interior of the building 2. Therefore, in the period from the vernal equinox to the autumnal equinox, it is possible to prevent the temperature inside the building 2 from increasing due to the sunlight.

[0054] Fig. 7(b) shows an irradiation range 30 of sunlight that has passed through a plurality of outer through holes 21 and a plurality of inner through holes 11 in another example of a solar shading device. In this example, the diameter Wout of the outer through hole 21 shown in Fig. 4 is set to 314 mm, the diameter Win of the inner through hole 11 is set to 120 mm, the gap d1 is set to 168 mm, and the angle between the horizontal line and a virtual line connecting the shortest distance between the opening edge of the outer through hole 21 and the opening edge of the inner through hole 11 is set to 30°. In addition, the horizontal pitches Ph and Pv of the plurality of outer through holes 21 and the plurality of inner through holes 11 are set to 960 mm.

[0055] In another example of a solar shading device shown in Figure 7(b), similarly to Figure 7(a), during the period from the vernal equinox to the autumnal equinox throughout the year, solar radiation passing through the outer through hole 21 due to the sun's orbit during this period can be irradiated only onto the surface of the inner shading plate 10 that is outside the inner through hole 11.

[0056] Next, another embodiment of the present invention will be described with reference to Fig. 8. Fig. 8 is a front view showing a schematic diagram of a solar shading device according to another embodiment. The solar shading device 1A shown in Fig. 8 has a characteristic configuration in that the arrangement of the outer through-holes and the inner through-holes is different from that of the solar shading device 1 described above.

[0057] That is, in the solar shading device 1, the multiple outer through-holes 21 formed in the outer shading plate 20 and the multiple inner through-holes 11 formed in the inner shading plate 10 are arranged at a staggered pitch, whereas in the solar shading device 1A, the multiple inner through-holes 11 and the multiple outer through-holes 21 are arranged at equal intervals in the horizontal direction and at equal intervals in the vertical direction, with the horizontal pitch being smaller than the vertical pitch. Other substantially identical configurations are given the same reference numbers and will not be described.

[0058] In Figure 8, the solar shading device 1A comprises four inner shading plates 10E, 10F, 10G, and 10H arranged outside the opening 5 of the building 2, and four outer shading plates 20E, 20F, 20G, and 20H arranged outside the inner shading plates with a gap d1 between them, and the outer shading plates have a plurality of outer through holes 21, and the inner shading plates have a plurality of inner through holes 11 smaller than the outer through holes 21, and the inner through holes 11 are formed inside the outer through holes 21 when viewed from the horizontal direction.

[0059] In the solar shading device 1A, the inner through-holes 11 and the outer through-holes 21 are arranged at equal intervals in the horizontal direction at a pitch Ph1 and at equal intervals in the vertical direction at a pitch Pv1, with the horizontal pitch Ph1 being set smaller than the vertical pitch Pv1. Specifically, the vertical pitch Pv1 is set to 500 mm, and the horizontal pitch Ph1 is set to 250 mm. The inner through-hole 11 has a diameter of 62.5 mm, and the outer through-hole 21 has a diameter of 164 mm.

[0060] The solar shading device 1A of the other embodiment configured in this way can obtain the same effect as the above embodiment. Specifically, the outside can be viewed from inside the room at a wide viewing angle through the multiple small inner through holes 11 of the inner shading plate 10 and the multiple large outer through holes 21 of the outer shading plate 20. In addition, the solar radiation that passes through the multiple large outer through holes 21 of the outer shading plate 20 is easily blocked by the surrounding areas except for the multiple small inner through holes 11 of the inner shading plate 10, so the amount of solar radiation entering the room can be suppressed.

[0061] Furthermore, by setting the vertical pitch Pv1 wide and the horizontal pitch Ph1 narrow, and arranging multiple outer through holes 21 and multiple inner through holes 11, it is possible to efficiently block sunlight and improve the view.

[0062] Although the embodiments of the present invention have been described in detail above, the present invention is not limited to the above embodiments, and various modifications can be made without departing from the spirit of the present invention described in the claims. In the present invention, the configuration of one embodiment can be added to the configuration of another embodiment, the configuration of one embodiment can be replaced with the configuration of another embodiment, or a part of the configuration of one embodiment can be deleted.

[0063] For example, as a fixing means for fixing the inner shading plate and the outer shading plate constituting the solar shading device to the building, an example was shown in which an angle and a groove-shaped member are fixed to the outer wall via a bracket, but this is not limited to this and other fixing means can be applied. Also, although the diameters of the multiple inner through holes and the multiple outer through holes are shown to be predetermined dimensions, the dimensions can be set appropriately as long as the diameter of the multiple inner through holes is smaller than the diameter of the multiple outer through holes. [Explanation of symbols]

[0064] 1: solar radiation shading device, 2: building, 3: exterior wall, 5: opening, 10: inner shading plate, 11: multiple inner through holes, 20: outer shading plate, 21: multiple outer through holes, Wout: diameter of the outer through hole, Win: diameter of the inner through hole, θ: spread angle from the inner through hole to the outer through hole

Claims

1. A solar shading device that covers at least a part of an opening of a building and blocks solar radiation toward an interior of the building, an inner light-shielding plate disposed outside the opening; and an outer light-shielding plate disposed outside the inner light-shielding plate with a gap therebetween, The outer light shielding plate has a plurality of outer through holes, the inner light shielding plate has a plurality of inner through holes smaller than the outer through holes, A solar shading device, characterized in that the inner through hole is formed inside the outer through hole when viewed in a horizontal direction.

2. The solar shading device described in claim 1, characterized in that the outer through hole and the inner through hole are formed so that, during a specified period throughout the year, including the day on which the annual solar altitude is the highest, solar radiation passing through the outer through hole due to the sun's orbit during that period irradiates only the surface of the inner shading plate that is outside the inner through hole.

3. A solar shading device as described in claim 1 or 2, characterized in that an angle between an imaginary line connecting the shortest distance between the opening edge of the inner through hole and the opening edge of the outer through hole and the horizontal line is greater than or equal to 20° and less than 40°.

4. The solar shading device according to any one of claims 1 to 3, characterized in that the plurality of inner through holes and the plurality of outer through holes are arranged at a staggered pitch.

5. the plurality of inner through holes and the plurality of outer through holes are arranged at equal intervals in a horizontal direction and at equal intervals in a vertical direction; 4. The solar shading device according to claim 1, wherein the horizontal pitch is set smaller than the vertical pitch.

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