Double skin curtain wall

Abstract

To improve ventilation efficiency of a double skin curtain wall.SOLUTION: A double skin curtain wall (10) having an outer skin (11) provided on the outer peripheral surface of a building, an inner skin (12) provided on the inner side of the outer skin of the building, and a cavity (14) which is a space provided between the outer skin and the inner skin has a first ventilation part (15) capable of introducing air into the cavity, and a second ventilation part (20) for discharging air in the cavity. The second ventilation part is provided at a position higher than the first ventilation part, and the second ventilation part has an air flow channel (23) projecting to the outside of the building from the outer peripheral surface of the building.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a double - skin curtain wall.

Background Art

[0002] Japanese Patent No. 5870450 (hereinafter referred to as Patent Document 1) describes a double - skin curtain wall having an outer skin material, an inner skin material, a lower ventilation opening, and an upper ventilation opening. The outside air introduced from the lower ventilation opening of the double - skin curtain wall passes through the hollow layer formed by the outer skin material and the inner skin material and is exhausted from the upper ventilation opening.

[0003] In addition to having such a ventilation function, the double - skin curtain wall separates the inside and outside of a building with a plurality of skin materials, so it has a high solar radiation shielding effect and is known as a technology capable of reducing the air - conditioning load of a building.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] There is room for improvement in the ventilation efficiency of conventional double - skin curtain walls. In a conventional double - skin curtain wall as described in Patent Document 1, since the ventilation opening for introducing outside air and the ventilation opening for exhausting air are provided in different directions, for example, when wind blows from a direction opposite to the opening direction of the exhaust ventilation opening, outside air is taken into the hollow layer from the exhaust ventilation opening, resulting in a decrease in ventilation efficiency.

[0006] One object of the present invention is to improve the ventilation efficiency of a double - skin curtain wall.

Means for Solving the Problems

[0007] The double - skin curtain wall according to one solution means of the present invention has an outer skin provided on the outer peripheral surface of a building, an inner skin provided inside the building rather than the outer skin, and a double - skin curtain wall having a cavity which is a space provided between the outer skin and the inner skin, and has a first ventilation part capable of introducing air into the cavity and a second ventilation part for discharging the air in the cavity. The second ventilation part is provided at a position higher than the first ventilation part, and the second ventilation part has an air flow path protruding from the outer peripheral surface of the building to the outside of the building, which is one feature.

Effects of the Invention

[0008] According to one solution means of the present invention, the ventilation efficiency of the double - skin curtain wall can be improved.

Brief Description of the Drawings

[0009]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Best Mode for Carrying Out the Invention

[0010] In the following embodiments of the present invention, when necessary, they will be described separately in a plurality of sections etc., but in principle, they are not unrelated to each other, and one is related to a modified example, details, etc. of a part or all of the other. For this reason, in all the figures, members having the same function are denoted by the same reference numerals, and the repeated description thereof is omitted. Also, regarding the number of components (including the number, numerical value, amount, range, etc.), unless otherwise specified or limited to a specific number in principle, it is not limited to that specific number, and it may be more than or less than the specific number. Further, when referring to the shape of components etc., unless otherwise specified and when it is considered that it is not so clearly in principle, it includes those substantially approximating or similar to the shape etc.

[0011] (First Embodiment) An embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a front view of the double - skin curtain wall 10, and FIG. 2 is a cross - sectional view of the double - skin curtain wall 10 cut along the line A - A in FIG. 1. The double - skin curtain wall 10 is provided as a part of a building B on the ground G covered with soil, earthen - floor concrete, etc. Hereinafter, the direction shown as the x - direction in FIG. 1 will be described as the width direction of the double - skin curtain wall 10, and the direction shown as the y - direction as the height direction of the double - skin curtain wall 10. Also, the left side in FIG. 2 will be described as the outdoor side of the building B, and the right side as the indoor side of the building B.

[0012] The double-skin curtain wall 10 has an outer skin 11 and an inner skin 12 which are curtain walls. The inner skin 12 is provided on the indoor side of the building B along members such as the facade M of the building B. The outer skin 11 is supported by an arm portion 13 fixed to the facade M and is provided on the outdoor side of the building B. Various known construction methods can be used for the supporting methods of the outer skin 11 and the inner skin 12.

[0013] The double-skin curtain wall 10 has a cavity 14. The cavity 14 is a space formed between the outer skin 11 and the inner skin 12 and is continuous in the height direction of the building B. The double-skin curtain wall 10 has an air introduction part 15 and an exhaust part 20 and can ventilate the air in the cavity 14. The air introduction part 15 is provided, for example, as an openable window and can take in outside air into the cavity 14 in the open state. The air taken in from the air introduction part 15 passes through the cavity 14 and is discharged from the exhaust part 20.

[0014] FIG. 3 is an enlarged view of the exhaust part 20. The exhaust part 20 is made of a member such as resin and is provided on the outdoor side of the building B rather than the inner skin 12 together with the outer skin 11. The exhaust part 20 has an air flow path 23 and an opening 25 and can discharge the air in the cavity 14 to the outside of the cavity 14.

[0015] The exhaust part 20 has a first piece 21 and a second piece 22. The first piece 21 and the second piece 22 extend in the width direction of the outer skin 11. The air flow path 23 and the opening 25 are formed by the first piece 21 and the second piece 22. The first piece 21 and the second piece 22 protrude to the outdoor side of the building B. The first piece 21 is provided closer to the ground G side than the second piece 22 and protrudes to the outdoor side of the building B more than the second piece 22. In the present embodiment, the first piece 21 and the second piece 22 are bent in the height direction of the building B, and accordingly, the opening 25 is also formed to face the height direction of the building B.

[0016] The double - skin curtain wall 10 has a frame body 17. An exhaust part 20 is fixed to the frame body 17. The exhaust part 20 is attached to the upper part of the outer skin 11 and the building B via the frame body 17.

[0017] Explain the air flow in the cavity 14 during ventilation. First, the air flow in the cavity 14 when the wind blows towards the outer skin 11 will be explained using FIGS. 4, 5, and 6. FIG. 4 is a conceptual diagram showing an example of the air flow around the double - skin curtain wall 10. FIG. 5 is a conceptual diagram showing an example of the air flow in the cavity 14 when the wind is blowing towards the outer skin 11, and FIG. 6 is a conceptual diagram showing an example of the air flow around the exhaust part 20 in the same state. In FIGS. 4, 5, and 6, the air flow is indicated by arrow lines. Note that in FIGS. 4, 5, and 6, some components of the double - skin curtain wall 10 are omitted for easier explanation of the air flow. Also, in the following description, the outdoor side of the building B in FIG. 4 etc. is taken as the front side of the double - skin curtain wall 10, and the indoor side of the building B is taken as the back side of the double - skin curtain wall 10.

[0018] When the wind blows from the front side of the double - skin curtain wall 10, the wind flows over the outer skin 11 (and thus the building B), and at the same time, the wind is taken into the cavity 14 from the air inlet part 15. The wind flowing over the outer skin 11 passes around the exhaust part 20 provided above the air inlet part 15 and flows onto the building B.

[0019] When the wind flows upward so as to overcome the outer skin 11, the wind collides with the first piece 21 of the protruding exhaust part 20. When the wind collides with the first piece 21, an air reverse flow region (the region where arrows are arranged in a spiral shape in FIG. 6) is generated near the second piece 22 corresponding to the back surface of the first piece 21. The air reverse flow region generates an air vortex near the second piece 22. When the air reverse flow region is generated near the second piece 22, the discharge of the air in the air flow path 23 that is bent toward the negative pressure reverse flow region is promoted. Then, the air in the cavity 14 is discharged from the opening 25. In this way, when the wind blows from the front side of the double-skin curtain wall 10, the cavity 14 is efficiently ventilated.

[0020] Next, the air flow in the cavity 14 when the wind blows from the back side to the front side of the double-skin curtain wall 10 will be described. FIG. 7 is a conceptual diagram showing an example of the air flow around the double-skin curtain wall 10 in a state where the wind blows from the back side to the front side of the double-skin curtain wall 10. The air flow is also shown by arrow lines in FIG. 6, and a part of the configuration of the double-skin curtain wall 10 is omitted.

[0021] In a state where the wind blows from the back side to the front side of the double-skin curtain wall 10, the air in the cavity 14 undergoes gravity ventilation. Since the exhaust part 20 is located at the upper part of the cavity 14, the warm air with a specific gravity lighter than that of the cold air rises in the cavity 14 and escapes from the opening 25. Since the double-skin curtain wall 10 is provided on the outdoor side of the building B as the outer peripheral surface of the building B, it is easily exposed to sunlight, and the cavity 14 is easily warmed by the sunlight. Therefore, the air in the cavity 14 is efficiently gravity-ventilated. Even when there is no wind, when the cavity 14 is warmed, the air in the cavity 14 undergoes gravity ventilation.

[0022] Furthermore, since the exhaust section 20 opens to the front side of the double-skin curtain wall 10, it is difficult for outside air to be taken in from the exhaust section 20 when the wind is blowing from the back side to the front side of the double-skin curtain wall 10, and gravity ventilation is hardly inhibited. In this way, when the wind is blowing from the back side of the double-skin curtain wall 10, the air in the cavity 14 is efficiently ventilated.

[0023] In this way, the double-skin curtain wall 10 can efficiently ventilate the air in the cavity 14 whether the wind is blowing from its front side or its back side.

[0024] Since the opening 25 is directed in the height direction of the building B, even when the wind is blowing from the front side of the double-skin curtain wall 10, the wind blowing towards the exhaust section 20 or the wind flowing over the outer skin 11 hardly enters the cavity 14 from the opening 25. When the wind is blowing from the back side of the double-skin curtain wall 10, since both the air introduction section 15 and the exhaust section 20 face the front side of the double-skin curtain wall 10, it is difficult for air to flow into the exhaust section 20, and gravity ventilation is hardly inhibited.

[0025] When the opening 25 is directed in the height direction of the building B, there is a risk of rain entering from the opening 25 during rainy weather. Therefore, it is advisable to provide the third piece 24 for rain reception across the width direction of the outer skin 11 to prevent the scattered rain from entering the inner skin 12 or the like. By providing the third piece 24, ventilation can be performed without soiling the cavity 14 or the inner skin 12 with rainwater even during rainy weather. It is advisable to make it possible to discharge the rain received by the third piece 24 by providing an inclination on the third piece 24 or providing a groove on the outer skin 11.

[0026] The air flow path 23 near the opening 25 may be narrowed. The air flow path 23 may be narrowed as it protrudes from the outer peripheral surface of the building B. By configuring the air flow path 23 in this way, the flow velocity of the air in the air flow path 23 during ventilation is increased by the Venturi effect, and the air in the cavity 14 can be efficiently ventilated.

[0027] If the opening direction of the opening 25 is on the indoor side of the building B, air may flow backward into the air flow path 23 due to the vortex of air generated above the second piece 22, and ventilation may be hindered. Therefore, the opening 25 is preferably provided in the height direction of the building B or toward the outdoor side of the building.

[0028] The double-skin curtain wall 10 is particularly suitable as a ventilation system for use in low-rise buildings such as single-story buildings. Since the cavity of a low-rise building has a smaller air volume than the cavity of a high-rise building, efficient ventilation can be achieved by an approach that effectively uses a small exhaust port such as the exhaust part 20 of the double-skin curtain wall 10. In addition, since the double-skin curtain wall 10 does not require a large ventilation part on the roof surface of the building like a conventional double-skin curtain wall, construction is easy, and in this respect also, it is suitable as a ventilation system for use in low-rise buildings.

[0029] (Second Embodiment) Another embodiment of the present invention will be described with reference to the drawings. FIG. 8 is a front view of the double-skin curtain wall 10A, and FIG. 9 is a cross-sectional view showing a state in which the double-skin curtain wall 10A is cut along line B-B in FIG. 9.

[0030] The double-skin curtain wall 10A has an outer skin 11A which is a curtain wall and an inner skin 12. The outer skin 11A is supported by an arm part 13 fixed to the column M, and is provided at a position away from the ground G on the outdoor side of the building B.

[0031] The outer skin 11A has an air inlet 15A on the surface facing the ground G. The air inlet 15A is provided as an openable and closable louver window, and can take in outside air into the cavity 14 in the open state. The air taken in from the air inlet 15A passes through the cavity 14 and is discharged from the exhaust part 20.

[0032] The effects of this embodiment will be described. Since the air inlet 15A of the double-skin curtain wall 10A faces the ground G side, the wind that blows toward the outer skin 11A and flows over the outer skin 11A can be efficiently taken into the cavity 14. Thereby, the inside of the cavity 14 is efficiently ventilated.

[0033] Since the air inlet 15A is provided at a certain height from the ground, the volume of the cavity 14 of the double-skin curtain wall 10A is small by that height. For this reason, air hardly stays in the cavity 14, and the inside of the cavity 14 is efficiently ventilated.

[0034] As described above, the present invention has been specifically described based on the embodiments. However, it goes without saying that the present invention is not limited to the above embodiments, and various modifications can be made without departing from the gist thereof.

[0035] In the cavity 14, a blind or a catwalk that does not obstruct the ventilation in the cavity 14 may be appropriately provided.

[0036] A plurality of exhaust parts 20 may be provided in the double-skin curtain wall 10. It may be provided not only at the uppermost part of the cavity 14 but also in the middle part of the cavity 14, for example, near the arm part 13-2. By providing a plurality of exhaust parts 20, the inside of the cavity 14 can be efficiently ventilated.

[0037] Note that, as the position where the exhaust part 20 is provided, the uppermost part of the cavity 14 and its periphery are preferable. This is because, at a position far from the ground G, a wind flow over the outer skin 11 is likely to occur.

[0038] The exhaust part 20 may be formed such that the member having the first piece 21 and the member having the second piece 22 are integrated.

[0039] As shown as 20B in FIG. 10, the air flow path 23 of the exhaust part 20 may be bent at a right angle. As shown as 20C in FIG. 10, the opening 25 may be provided in the protruding direction of the air flow path 23. Even in such a form, the inside of the cavity 14 can be efficiently ventilated by utilizing the wind flowing over the upper part of the building B.

[0040] As shown as 20D in FIG. 10, a plurality of air flow paths 23 and exhaust holes 25 may be provided in the exhaust part 20. By providing a plurality of air flow paths 23 and exhaust holes 25, the inside of the cavity 14 can be efficiently ventilated.

Explanation of reference numerals

[0041] 10 Double - skin curtain wall 11 Outer skin 12 Inner skin 14 Cavity 15 Air introduction part 20 Exhaust part 23 Air flow path 25 Opening

Claims

1. An outer skin provided on the outer peripheral surface of a building, an inner skin provided inside the building relative to the outer skin, a double-skin curtain wall having a cavity which is a space provided between the outer skin and the inner skin, a first ventilation part capable of introducing air into the cavity, and a second ventilation part for discharging the air in the cavity, wherein the second ventilation part is provided at a position higher than the first ventilation part, and the second ventilation part has an air flow path protruding outward from the outer peripheral surface of the building. A double-skin curtain wall characterized by this.

2. The air flow path of the second ventilation part is provided so as to become narrower as it moves away from the outer peripheral surface of the building in the outward direction of the building. The double-skin curtain wall according to Claim 1, characterized by this.

3. The air flow path has a bent part, and the opening of the air flow path faces the standing direction of the double-skin curtain wall. The double-skin curtain wall according to Claim 1, characterized by this.

4. The second ventilation part has a rising part in the cavity. The double-skin curtain wall according to Claim 3, characterized by this.

5. The outer skin is provided at a position separated from the ground, and the first ventilation part is provided on the outer skin facing the ground side. The double-skin curtain wall according to any one of Claims 1 to 4, characterized by this.

Images