Installation structure of solar power generation sheets

Abstract

This invention provides an installation structure for solar power generation sheets that reduces the load on the installation surface and allows for easy inspection of the condition of the installation area. [Solution] An installation structure for a solar power generation sheet, comprising: an installation surface having protrusions; a solar power generation sheet disposed between the protrusions of the installation surface; and a fixing portion that fixes one solar power generation sheet and sandwiches the protrusions, wherein the protrusions have a first side which is the side of the solar power generation sheet on the central side and a second side which is the side opposite to the first side, and the fixing portion has one first side fixing portion that contacts the first side and a plurality of second side fixing portions that are arranged in the area of ​​the protrusions that contacts the first side fixing portion and that contact the second side, wherein at least a part of the second side is exposed between each of the second side fixing portions.

Description

Technical Field

[0001] The present invention relates to an installation structure of a photovoltaic sheet.

Background Art

[0002] Conventionally, as solar cells, rigid solar cell panels made of silicon semiconductors have been widely used. However, since conventional solar cell panels have a certain weight, they cannot be installed on some structures with low load-bearing capacity, or even on an installation surface where they can be installed, but they cannot be installed on a part with low load-bearing capacity, so there is a problem that the area of the installation surface cannot be effectively utilized. Therefore, in recent years, flexible solar cells based on heat-resistant polymer materials such as polyimide and polyester, or metal foils have been attracting attention. Flexible solar cells have advantages such as ease of transportation and construction due to thinning and weight reduction, and being resistant to impact, and can be installed on folded-plate roofs and the like where installation was difficult due to the conventional load-bearing problem. Although the installation method of a photovoltaic sheet using a flexible solar cell has not been established yet, as a method of fixing the sheet, Patent Document 1 discloses a method of fixing a light-shielding sheet by placing the light-shielding sheet on the ridge of a folded-plate roof, covering it with a long packing member, and then covering it with a fixing fitting having substantially the same length as the packing member to sandwich the light-shielding sheet between the packing member and the ridge.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] On the other hand, corrugated metal roofs have low strength, and when the seams are clamped with a jig as in Patent Document 1, the seams deform, creating gaps in the corrugated metal roof and sometimes causing leaks. Solar power generation sheets, in particular, have wiring, so deformation is less tolerable than with conventional sheets and need to be firmly fixed to the installation surface. As a result, the fixing jigs tend to be reinforced and heavy, making the corrugated metal roof more prone to deformation. Furthermore, in order to repair or prevent the above-mentioned leaks, it is necessary to check the condition of the seams around the installation area, but with sheet installation methods such as in Patent Document 1, the seams are covered by the sheet and fixing jig, and there is a problem that the condition of the seams cannot be checked without removing the fixing jig and sheet.

[0005] The present invention aims to provide an installation structure for a solar power generation sheet that reduces the load on the installation surface and allows for easy confirmation of the condition of the installation area. [Means for solving the problem]

[0006] The present invention includes the following disclosures 1 to 5. The present invention will be described in detail below. [Disclosure 1] A solar power generation sheet installation structure, An installation surface having a protruding portion, A solar power generation sheet is placed between the protruding portions of the installation surface, It has a fixing part that secures one of the aforementioned solar power generation sheets and holds the aforementioned protruding part in place. The protruding portion has a first side surface which is the side surface on the central side of the solar power generation sheet, and a second side surface which is the side surface opposite to the first side surface. The fixing portion includes one first side fixing portion that contacts the first side surface, The protruding portion has a plurality of second side fixing portions arranged in the area in which it makes contact with the first side fixing portion and which make contact with the second side, Between each of the second side fixing portions, at least a portion of the second side is exposed. A solar power generation sheet installation structure characterized by the following features. [Disclosure 2] An installation structure for a photovoltaic sheet according to disclosure 1, having three or more of the aforementioned second side fixing parts. [Disclosure 3] The installation structure for a photovoltaic sheet according to disclosure 1 or 2, characterized in that each of the second side fixing portions has a reinforcing member that connects it in the direction of extension of the protruding portion, and the height of the reinforcing member is less than or equal to the height of the protruding portion. [Disclosure 4] An installation structure for a solar power generation sheet according to any one of disclosures 1 to 3, characterized in that the solar power generation sheet and the second side fixing portion do not come into contact. [Disclosure 5] The installation structure for a solar power generation sheet according to any one of disclosures 1 to 4, characterized in that the solar power generation sheet is fixed on the fixing part. [Effects of the Invention]

[0007] According to the present invention, it is possible to provide an installation structure for a solar power generation sheet that reduces the load on the installation surface and allows for easy confirmation of the condition of the installation area. [Brief explanation of the drawing]

[0008] [Figure 1] This is a schematic perspective view showing an example of the installation structure for the solar power generation sheet of the present invention. [Figure 2] This is a schematic cross-sectional view showing an example of the installation structure for the solar power generation sheet of the present invention. [Figure 3] This is a schematic perspective view illustrating yet another example of the installation structure for the solar power generation sheet of the present invention. [Figure 4] This is a schematic cross-sectional view illustrating yet another example of the installation structure for the solar power generation sheet of the present invention. [Modes for carrying out the invention]

[0009] The present invention will be described in more detail below with reference to specific embodiments, but the present invention is not limited to these embodiments.

[0010] (Embodiment 1) Figure 1 shows a schematic perspective view illustrating an example of the installation structure of the solar power generation sheet of the present invention, and Figure 2 shows a schematic cross-sectional view illustrating an example of the installation structure of the solar power generation sheet of the present invention. Figures 1 and 2 show examples of solar power generation sheets being installed on a corrugated metal roof. In Embodiment 1, a solar power generation sheet 3 is placed between the protruding portions 1A (seams) of an installation surface 1 (corrugated metal roof). Each protruding portion 1A has a first side surface, which is the central side of the solar power generation sheet 3, and a second side surface, which is the opposite side to the first side surface. The protruding portions 1A are sandwiched between fixing portions 2, which have one first side fixing portion 2A that contacts the first side surface, and a second side fixing portion 2B that is positioned in the area where the first side fixing portion 2A of the protruding portion 1A contacts and contacts the second side surface. One side of a single solar power generation sheet 3 is fixed to the installation surface 1 by being pressed against the installation surface 1 by the first side fixing portion 2A, or by being sandwiched between the protruding portions 1A, etc. The fixing portion 2 has a plurality of second side fixing portions 2B, which are discretely arranged in the area where the first side fixing portion 2A of the protruding portion 1A contacts. By arranging the second side fixing parts 2B in this manner, at least a portion of the second side surface of the protruding part 1A is exposed in the section between the second side fixing parts 2B, making it easy to check the condition of the installation area. Furthermore, by arranging the second side fixing parts 2B discretely, the fixing part 2 becomes lighter, reducing the load on the installation surface 1 and the protruding part 1A, while the first side fixing part 2A makes contact with the solar power generation sheet 3 over a wide area, so the fixing force is not easily reduced. Note that the solar power generation sheet 3 may have its edges on the second side surface as long as it does not cover the entire second side surface.

[0011] The building material or structure constituting the above-mentioned mounting surface is not particularly limited as long as it has a protruding part that can clamp the fixing part, and examples of such building materials or structures include corrugated metal roofs, standing seam roofs, and vertical seam roofs. Corrugated metal roofs in particular have a low load-bearing capacity and are easily deformed, so the effects of the present invention are greatly demonstrated.

[0012] The above-mentioned photovoltaic sheet is a member that generates electricity by receiving sunlight, and has characteristics such as being lightweight, flexible, and thin. In this specification, the "sheet" means a shape whose thickness of the object is 10% or less with respect to the maximum length between the outer edges in a plan view. When the shape in a plan view is rectangular, the "maximum length between the outer edges in a plan view" means the length of the diagonal. Also, when the shape in a plan view is circular, the "maximum length between the outer edges in a plan view" means the length of the diameter. Furthermore, in this specification, a film shape, a foil shape, a film-like shape, etc. are also included in the "sheet".

[0013] The above-mentioned photovoltaic sheet can use a conventionally known thin solar cell. For example, there is a photovoltaic sheet in which a power generation part sealed with a sealing material on a back sheet and a front sheet are laminated via a sealing material or an adhesive layer on the power generation part. Also, the photovoltaic conversion material used for the power generation part of the above-mentioned photovoltaic sheet can also use a conventionally known material. For example, non-silicon-based materials such as amorphous silicon, organic-inorganic perovskite compounds, and CIGS can be mentioned.

[0014] The shape of the above-mentioned photovoltaic sheet is not particularly limited as long as it is sheet-shaped. For example, a quadrangle, a circle, an ellipse, a polygon, etc. can be mentioned, and it can be appropriately determined according to the above installation surface.

[0015] The above-mentioned photovoltaic sheet preferably has a bending strength of 10 MPa or more, more preferably 20 MPa or more, and even more preferably 50 MPa or more. When the lower limit of the bending strength of the above-mentioned photovoltaic sheet is within the above range, the handling property can be further improved. Also, the above-mentioned photovoltaic sheet preferably has a bending strength of 200 MPa or less, more preferably 150 MPa or less, and even more preferably 50 MPa or less. When the upper limit of the bending strength of the above-mentioned photovoltaic sheet is within the above range, the flexibility can be further improved. The bending strength of the above-mentioned photovoltaic sheet can be measured by a method compliant with JIS K7171.

[0016] The above-mentioned solar power generation sheet preferably has a flexural modulus of 100 MPa or more, and more preferably 500 MPa or more. Having the lower limit of the flexural modulus of the solar power generation sheet within this range improves handling. Furthermore, the above-mentioned solar power generation sheet preferably has a flexural modulus of 10,000 MPa or less, and more preferably 5,000 MPa or less. Having the upper limit of the flexural modulus of the solar power generation sheet within this range improves flexibility. The flexural modulus of the above-mentioned solar power generation sheet can be measured by a method compliant with JIS K7171.

[0017] The solar power generation sheet may be directly fixed to the installation surface, or the solar power generation sheet may be fixed to a fiber-reinforced sheet or the like, and the fiber-reinforced sheet to which the solar power generation sheet is fixed may be fixed to the installation surface. Examples of the fiber-reinforced sheet include fiber-reinforced sheets or nonwoven fabrics in which fibers made of polyethylene, polypropylene, polyester, polylactic acid, polyolefin, asphalt, silica sand, etc. are coated with resin. When the solar power generation sheet is fixed to the installation surface via the fiber-reinforced sheet or the like, the fiber-reinforced sheet or the like is included in the solar power generation sheet.

[0018] It is preferable that the above-mentioned solar power generation sheet does not come into contact with the second side surface. While the edges of the solar power generation sheet may be on the second side as long as they do not cover the entire second side, the exposed area of ​​the second side can be increased by ensuring that the edges do not come into contact with the second side, i.e., by having the edges on the first side.

[0019] The material of the fixing part mentioned above only needs to have enough rigidity to fix the solar power generation sheet, and examples include metals such as steel, aluminum alloy, stainless steel, nickel alloy, and copper alloy; hard plastics such as polyvinyl chloride, polycarbonate, acrylic, polypropylene, ABS resin, AS resin, and PPS resin; rubber; ceramics; or composite materials thereof.

[0020] The first and second side fixing parts may be separate or connected by hinges or the like. If the first and second side fixing parts are separate, the position of the second side fixing part can be freely set, and if the first and second side fixing parts are connected, the installation work becomes easier. If the first and second side fixing parts are separate, methods for connecting them include bolting, welding, riveting, etc.

[0021] The shapes of the first and second side fixing portions are not particularly limited as long as they can fix the fixing portion and the solar power generation sheet with the protruding portion in between. In particular, it is preferable that the first side fixing portion contacts the solar power generation sheet over as wide an area as possible, in order to fix the solar power generation sheet more firmly. Specifically, it is preferable that it contacts 50% or more of the side of the solar power generation sheet that contacts the first side fixing portion, and more preferably 80% or more. The upper limit of the contact area between the first side fixing portion and the solar power generation sheet is not particularly limited and may exceed 100%, that is, it may extend beyond both ends of the side of the solar power generation sheet that both ends of the first side fixing portion are in contact with.

[0022] Preferably, the first side fixing portion described above has a contact length in the depth direction with the solar power generation sheet of 500 mm or more and 2000 mm or less. Here, the depth direction refers to the direction in which the protruding portion extends when the installation surface is viewed from the light-receiving surface side in a plan view. When the contact length in the depth direction between the first side fixing portion and the solar power generation sheet is within the above range, the solar power generation sheet can be pressed more firmly against the installation surface and fixed in place. The contact length in the depth direction between the first side fixing portion and the solar power generation sheet is more preferably 750 mm or more, even more preferably 1000 mm or more, even more preferably 1750 mm or less, and even more preferably 1500 mm or less.

[0023] The number of the second side fixing parts described above is not particularly limited as long as there are two or more, but it is preferable to have three or more. By having three or more of the second side fixing parts, the balance between the exposed area of ​​the second side and the fixing force can be further improved. It is even more preferable that the number of the second side fixing parts described above is two or more. There is no particular upper limit to the number of the second side fixing parts described above, but it is preferable to have five or fewer from the viewpoint of ensuring the exposed area of ​​the second side.

[0024] Preferably, the total length of the second side fixing portion in the depth direction is 1% or more and 80% or less of the length of the first side fixing portion in the depth direction. The ratio of the total length in the depth direction of each second side fixing part to the length in the depth direction of the first side fixing part is within the above range, which further improves the balance between the clamping force of the fixing part and the exposed area of ​​the second side. The ratio of the total length in the depth direction of each second side fixing part to the length in the depth direction of the first side fixing part is more preferably 10% or more, even more preferably 20% or more, even more preferably 60% or less, and even more preferably 50% or less.

[0025] Preferably, the second side fixing portion described above has a contact length in the depth direction with the portion of the mounting surface other than the protruding portion described above that is between 1 mm and 1500 mm. By setting the contact length in the depth direction between the second side fixing part and the part of the installation surface other than the protruding part to the above range, displacement of the fixing part can be further suppressed, and the force from the fixing part is distributed by the part other than the protruding part, so the load on the protruding part can be further suppressed. The contact length in the depth direction between the second side fixing part and the part of the installation surface other than the protruding part is more preferably 5 mm or more, even more preferably 10 mm or more, even more preferably 1000 mm or less, and even more preferably 500 mm or less.

[0026] (Embodiment 2) Figure 3 shows a schematic perspective view illustrating another example of the installation structure for the solar power generation sheet of the present invention, and Figure 4 shows a schematic cross-sectional view illustrating yet another example of the installation structure for the solar power generation sheet of the present invention. In Embodiment 2, unlike Embodiment 1, the fixing part 2, which consists of a first side fixing part 2A and a second side fixing part 2B, has a fixing plate 5 at its upper part, and the solar power generation sheet 3 is fixed to the fixing part 2 by fixing the solar power generation sheet 3 on the fixing plate 5. In Embodiment 2, a reinforcing member 4 is provided to connect each second side fixing part 2B in the extension direction (depth direction) of the protruding part 1A. By connecting the second side fixing parts 2B with the reinforcing member 4, the rigidity of the second side fixing parts 2B and the entire fixing part 2 can be further increased. Also, since the height of the reinforcing member 4 is less than or equal to the height of the protruding part 1A, it does not cover the entire second side. Here, height refers to the length in the direction perpendicular to the installation surface, and if the installation surface 1 has irregularities, it refers to the length in the direction perpendicular to the surface formed by the apex of the protrusion or the bottom of the recess. In addition, the solar power generation sheet 3 may be fixed to the upper part of the fixing part 2 without using the fixing plate 5. Furthermore, even when the second side fixing portion 2B is connected by the reinforcing material 4, there are multiple parts that come into contact with the second side, so the fixing portion 2 has multiple second side fixing portions 2B.

[0027] The material of the reinforcing material is not particularly limited, and the same material as the material of the fixing part can be used.

[0028] The reinforcing material described above preferably has a Young's modulus of 5 GPa or higher. The reinforcing effect of the second side fixing portion can be further enhanced if the Young's modulus of the reinforcing material is within the above range. It is more preferable that the Young's modulus of the reinforcing material be 10 GPa or higher. There is no particular upper limit to the Young's modulus of the reinforcing material, and a higher value is better, but due to processing technology limitations, it is limited to about 250 GPa.

[0029] The height of the reinforcing material is preferably 1% to 80% of the height of the second side surface. By having the height of the reinforcing material within the above range, it is possible to increase the exposed area of ​​the second side surface while still achieving the effect of a reinforcing material. The height of the reinforcing material is more preferably 10% or more of the height of the second side surface, even more preferably 20% or more, even more preferably 60% or less, and even more preferably 50% or less.

[0030] In Embodiment 2, it is preferable that the first side fixing portion has a contact length in the width direction with the portion of the installation surface other than the protruding portion, which is 1 mm or more and 100 mm or less. Here, the width direction refers to the direction perpendicular to the extension direction of the protruding portion when the installation surface is viewed from the light-receiving surface side. By having the contact length in the width direction between the first side fixing portion and the portion of the installation surface other than the protruding portion within the above range, displacement of the fixing portion can be further suppressed, and the force from the fixing portion can be distributed to the portion of the installation surface other than the protruding portion, thereby further reducing the load on the protruding portion. The contact length between the first side fixing portion and the portion of the installation surface other than the protruding portion is more preferably 2 mm or more, even more preferably 5 mm or more, even more preferably 75 mm or less, and even more preferably 50 mm or less.

[0031] The material of the fixing plate can be the same as that of the fixing part. The fixing plate may be placed on one fixing part or between two fixing parts. Methods for fixing the solar power generation sheet to the fixing plate include bolting, adhesive bonding, and fusion bonding. [Explanation of Symbols]

[0032] 1 Installation surface 1A protrusion 2 Fixed part 2A 1st side fixing part 2B 2nd side fixing part 3. Solar power generation sheet 4. Reinforcement 5 Fixed plate

Claims

1. A solar power generation sheet installation structure, An installation surface having a protruding portion, A solar power generation sheet is placed between the protruding portions of the installation surface, It has a fixing part that secures one of the solar power generation sheets and holds the protruding part in place, The protruding portion has a first side surface which is the side surface on the central side of the solar power generation sheet, and a second side surface which is the side surface opposite to the first side surface. The fixing portion includes one first side fixing portion that contacts the first side surface, The protruding portion has a plurality of second side fixing portions arranged in the area in which it makes contact with the second side, and which make contact with the second side. Between each of the second side fixing portions, at least a portion of the second side is exposed. A solar power generation sheet installation structure characterized by the following features.

2. The installation structure for a solar power generation sheet according to claim 1, having three or more of the second side fixing parts.

3. The installation structure for a solar power generation sheet according to claim 1 or 2, characterized in that each of the second side fixing portions has a reinforcing member that connects to the protruding portion in the extension direction, and the height of the reinforcing member is less than or equal to the height of the protruding portion.

4. The installation structure for a solar power generation sheet according to claim 1 or 2, characterized in that the solar power generation sheet does not come into contact with the second side surface.

5. The solar power generation sheet installation structure according to claim 1 or 2, characterized in that the solar power generation sheet is fixed on the fixing part.

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