Installation structure of solar power generation sheets

Abstract

The present invention provides an installation structure for solar power generation sheets that can firmly fix the solar power generation sheets and suppress deformation of the solar power generation sheets due to wind. [Solution] An installation structure for a solar power generation sheet comprising an installation surface having a protruding portion, a solar power generation sheet, and a fixing member that sandwiches and fixes the solar power generation sheet to the flat portion of the protruding portion, wherein the fixing member has a compression portion that tightly fixes the solar power generation sheet to the protruding portion on the portion facing the protruding portion, and a gap portion that does not come into contact with the protruding portion, wherein the contact surface of the compression portion with the solar power generation sheet is flat, parallel to the extension direction of the fixing member, and the length in the width direction is greater than or equal to the width direction length of the solar power generation sheet.

Description

Technical Field

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

Background Art

[0002] Conventionally, rigid solar cell panels made of silicon semiconductors have been widely used as solar cells. 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 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 attracted 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 roofs that were difficult to install due to the conventional load-bearing problem. Although the installation method of a photovoltaic sheet using a flexible solar cell has not yet been established, as a method of fixing the sheet, Patent Document 1 discloses a method of fastening a heat insulation sheet by placing the heat insulation sheet on the ridge of a folded roof, covering it with a long packing member, and then covering it with a fixing metal 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] However, when using the fixing method described in Patent Document 1 to secure the solar power generation sheet, deformation due to wind becomes a problem. When the object to be fixed is a heat-shielding sheet like the one in Patent Document 1, the heat-shielding sheet is breathable, so even if wind blows in, it can easily escape and deformation is unlikely to occur. On the other hand, solar power generation sheets are not breathable, so when fixed to a corrugated metal roof, deformation (bending) is likely to occur due to wind blowing into the recesses of the corrugated metal roof. In addition, in recent years, solar power generation sheets have been increasing in size, and large solar power generation sheets with sides exceeding 50 cm have appeared. While such large-area solar power generation sheets have the advantage of faster installation and an increased effective power generation area compared to using multiple small-area solar power generation sheets, they have the disadvantage of being more susceptible to deformation due to wind. In particular, since deformation of the solar power generation sheet changes the direction of incident sunlight and affects power generation efficiency, stronger fixing is required than for other objects to be fixed. However, fixing methods like those in Patent Document 1 have the problem of being insufficient.

[0005] The present invention aims to provide an installation structure for a solar power generation sheet that can firmly fix the solar power generation sheet and suppress deformation of the solar power generation sheet due to wind. [Means for solving the problem]

[0006] The present invention includes the following disclosures 1 to 4. The present invention will be described in detail below. [Disclosure 1] It comprises an installation surface having a protruding portion, a solar power generation sheet, and a fixing member that sandwiches and fixes the solar power generation sheet to the flat portion of the protruding portion. The fixing member has a compression portion that secures the solar power generation sheet to the protruding portion in close contact with the protruding portion, and a gap portion that does not come into contact with the protruding portion. The compression section has a flat contact surface with the solar power generation sheet. An installation structure for a solar power generation sheet, characterized in that the length of the fixing member is parallel to the extension direction and its length in the width direction is greater than or equal to the length of the solar power generation sheet in the width direction. [Disclosure 2] The installation structure for a solar power generation sheet according to Disclosure 1, characterized in that the solar power generation sheet has a length in the width direction of 50 cm or more and 2 m or less. [Disclosure 3] The installation structure for a solar power generation sheet according to disclosure 1 or 2, characterized in that the fixing member has two compression parts and fixes two solar power generation sheets to both sides of one protruding part. [Disclosure 4] The solar power generation sheet installation structure according to any one of disclosures 1 to 3, characterized in that the end of the edge fixed to the fixing member extends beyond the vertex of the protruding 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 can firmly fix the solar power generation sheet and suppress deformation of the solar power generation sheet due to wind. [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 perspective view showing the fixing portion of the installation structure for the solar power generation sheet of the present invention. [Figure 3] This is a schematic perspective view showing a further embodiment of the fixing portion 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, Figure 2 shows a schematic perspective view illustrating the fixing portion of the installation structure of the solar power generation sheet of the present invention, and Figure 3 shows a schematic perspective view illustrating a further embodiment of the fixing portion of the installation structure of the solar power generation sheet of the present invention. Figures 1 to 3 show examples of solar power generation sheets being installed on a folded metal roof with a seam-fastened roof. In Embodiment 1, the solar power generation sheet 2 is sandwiched and fixed by the fixing member 3 on the flat portion of the protruding portion 1A of the installation surface 1. The fixing member 3 has a compression portion 3A on the side of the protruding portion 1A, i.e., the interior during installation, which tightly fixes the solar power generation sheet 2 to the protruding portion 1A, and a gap portion 3B that does not come into contact with the protruding portion 1A. Furthermore, the compression portion 3A has a flat contact surface with the solar power generation sheet 2, is parallel to the extension direction of the fixing member 3, and its length in the width direction is greater than or equal to the width direction of the solar power generation sheet 2. Note that in Figure 1, the part of the fixing member 3 on the compression portion 3A side has an open portion, and the end of the solar power generation sheet 2 is visible, but it is not necessary to have an open portion.

[0011] The inventors investigated the reason why the fixing force is insufficient when applying conventional sheet fixing methods, such as those described in Patent Document 1, to solar power generation sheets. As a result, they found that the cause is that the solar power generation sheet is not pressed against the protruding portion with uniform force. In fixing methods like those described in Patent Document 1, the fixing member compresses the entire area of ​​the protruding portion, so the solar power generation sheet sandwiched between the fixing member is subjected to force from various directions. Furthermore, since some variation in the shape of the protruding portion and the crimping force of the fixing member is unavoidable, it is difficult to compress the solar power generation sheet uniformly with the same force, and deformation occurs starting from areas of weak compression. In the present invention, the fixing member is in contact with only a part of the protruding portion, and the contact surface between the compressed portion and the solar power generation sheet is flat and parallel to the extension direction of the fixing member, and its length in the width direction is greater than or equal to the width direction of the solar power generation sheet. As a result, the force applied to the entire width direction of the solar power generation sheet is uniform and in one direction, improving the fixing force and suppressing deformation of the solar power generation sheet due to wind. In addition, by suppressing deformation of the solar power generation sheet, the impact of deformation on power generation efficiency can be reduced.

[0012] In this specification, "extension direction of the fixing member" and "width direction" refer to the direction in which the protruding portion extends when the installation structure of the solar power generation sheet of the present invention is viewed in plan view perpendicular to the installation surface and from the light-receiving surface side (Z-axis + direction in the figure). Also, "height" refers to the length in the direction perpendicular to the installation surface (Z-axis direction in the figure). Furthermore, "flat" means a shape in which the surfaces that come into contact with other members (contact surfaces) are on the same plane. In addition, "parallel" includes not only perfect parallelism but also substantially parallelism within a certain margin of error.

[0013] The building material or structure that constitutes the installation surface having the above-mentioned protrusion is not particularly limited as long as it has a flat portion in which a fixing member can be sandwiched between the protrusion to fix the solar power generation sheet. Examples of building materials or structures having such a flat portion and protrusion include corrugated metal roofs, standing seam roofs, and vertical seam roofs.

[0014] The above photovoltaic sheet is a member that generates electricity by receiving sunlight. In this specification, the "sheet" means a shape in which the thickness of the object is 10% or less of the maximum length between the outer edges in a plan view. Also, in this specification, even when the power generation part does not have flexibility or is not sheet-shaped, if the power generation part is fixed to a sheet material and is in a shape that fixes the sheet material to the installation surface, it is included in the photovoltaic sheet.

[0015] The above photovoltaic sheet can use a conventionally known thin solar cell. For example, a photovoltaic sheet in which a power generation part sealed with a sealing material on a backsheet and a front sheet are laminated via a sealing material or an adhesive layer on the power generation part can be mentioned. Also, the photovoltaic conversion material used for the power generation part of the above photovoltaic sheet can also use conventionally known materials. For example, non-silicon-based materials such as amorphous silicon, organic-inorganic perovskite compounds, and CIGS can be mentioned.

[0016] If the shape of the above photovoltaic sheet is sheet-shaped, the planar shape is not particularly limited. For example, a circular shape, an elliptical shape, a polygonal shape, etc. can be mentioned, and it can be appropriately determined according to the above installation surface. When the shape of the above photovoltaic sheet is other than a quadrangle, the length in the width direction of the above compression part may be longer than the length of the part where the photovoltaic sheet and the protruding part contact.

[0017] The above photovoltaic sheet preferably has a bending strength of 10 MPa or more, more preferably 20 MPa or more, and still more preferably 50 MPa or more. By setting the lower limit of the bending strength of the above photovoltaic sheet within the above range, the handling property can be further improved. Also, the above photovoltaic sheet preferably has a bending strength of 200 MPa or less, more preferably 150 MPa or less, and still more preferably 50 MPa or less. By setting the upper limit of the bending strength of the above photovoltaic sheet within the above range, the flexibility can be further improved. The bending strength of the above photovoltaic sheet can be measured by a method conforming to JIS K7171.

[0018] The above-mentioned photovoltaic sheet preferably has a flexural modulus of 100 MPa or more, more preferably 500 MPa or more. When the lower limit of the flexural modulus of the above-mentioned photovoltaic sheet is within the above range, the handling property can be further improved. Further, the above-mentioned photovoltaic sheet preferably has a flexural modulus of 10,000 MPa or less, more preferably 5,000 MPa or less. When the upper limit of the flexural modulus of the above-mentioned photovoltaic sheet is within the above range, the flexibility can be further improved. The flexural modulus of the above-mentioned photovoltaic sheet can be measured by a method conforming to JIS K7171.

[0019] The above-mentioned photovoltaic sheet may be directly fixed to the above installation surface, or the photovoltaic sheet may be fixed to a fiber-containing sheet or the like, and the fiber-containing sheet to which the photovoltaic sheet is fixed may be fixed to the installation surface. Examples of the above fiber-containing sheet include a fiber-reinforced sheet or a non-woven fabric in which fibers made of polyethylene, polypropylene, polyester, polylactic acid, polyolefin, asphalt, silica sand, etc. are coated with a resin. When the above-mentioned photovoltaic sheet is fixed to the above installation surface via the above fiber-containing sheet or the like, the above fiber-containing sheet or the like is included in the above-mentioned photovoltaic sheet.

[0020] For the above-mentioned photovoltaic sheet, it is preferable that the end of the side fixed to the fixing member exceeds the apex of the protruding portion. Here, Figure 3 shows a schematic perspective view illustrating a further aspect of the fixing portion of the installation structure for the solar power generation sheet. When fixing the solar power generation sheet to the protruding portion, it is preferable to fix it in a tightly taut state from the viewpoint of further suppressing deformation. To tightly taut the solar power generation sheet, it is necessary to grasp and pull at least 3 to 5 cm from the edge. When the fixing member is sandwiched in this state, as shown in Figure 3, the edge of the solar power generation sheet will be located beyond the apex of the protruding portion, in other words, on the side of the protruding portion 1A where the solar power generation sheet 2 is not compressed. By fixing the solar power generation sheet so that the edge extends beyond the apex of the protruding portion, the fixing force can be increased, and deformation due to wind can be further suppressed. Note that since the edge of the solar power generation sheet is located in the gap, it is not subjected to compression from the fixing member and does not affect the even clamping force by the fixing member.

[0021] The above-mentioned solar power generation sheet may have a rigid member along the entire end of the side that is fixed to the above-mentioned fixing member. As described above, when attaching and fixing the solar power generation sheet, the edges that are fixed to the fixing member are grasped and pulled, so by placing a rigid member there, the solar power generation sheet can be pulled easily and evenly. In addition, when the ends of two sides of the solar power generation sheet are hardened by the rigid member, the solar power generation sheet becomes easier to flatten, making it less likely for dirt to accumulate. The material of the rigid member is not particularly limited and examples include metal, hard resin, composite reinforced material, etc.

[0022] The above-mentioned solar power generation sheet preferably has a length in the width direction of 50 cm or more and 2 m or less. As described above, the larger the solar power generation sheet, the faster the installation and the greater the effective area for power generation. However, it becomes more susceptible to deformation due to wind, requiring stronger fixing. The solar power generation sheet installation structure of the present invention has sufficient fixing force to securely fix large solar power generation sheets with a width within the above range, thus maximizing the effects of the present invention. The length of the solar power generation sheet in the width direction is more preferably 80 cm or more, even more preferably 100 cm or more, even more preferably 180 cm or less, and even more preferably 150 cm or less.

[0023] The structure of the above-mentioned fixing member is not particularly limited as long as it has the compression portion and the gap portion, but for example, as shown in Figure 1, a fixing member can be provided in which a member including the compression portion and a member constituting the opposite side of the compression portion are connected and sandwiched together with screws or the like. Another example is a fixing member in which a member including the compression portion and a member constituting the opposite side of the compression portion are connected and integrated by a hinge or the like, and a protruding portion can be sandwiched by moving the hinge or the like.

[0024] The shape of the compression portion of the fixing member described above is not particularly limited as long as the contact surface with the solar power generation sheet is flat and parallel to the extension direction of the fixing member. The contact surface may be a single flat surface, or it may be a single surface divided by regularly arranged recesses. Furthermore, the shape of the opposite side of the compression portion, in other words, the portion that is paired with the compression portion and sandwiches the protruding portion, is not particularly limited as long as it can sandwich the protruding portion in such a way that the force applied by the compression portion to the protruding portion is equal. It may be the same shape as the compression portion, or it may be a different shape.

[0025] The contact surface of the compression section described above preferably has a height of 1 mm or more and 10 mm or less. By having a contact surface height of the compression section greater than or equal to the lower limit mentioned above, the fixing force of the solar power generation sheet can be increased while fixing it with a more uniform force. Also, by having a compression section height less than or equal to the upper limit mentioned above, the overall size of the jig can be reduced, making the fixing work easier. The contact surface height of the compression section is more preferably 2 mm or more, even more preferably 3 mm or more, even more preferably 8 mm or less, and even more preferably 5 mm or less.

[0026] The shape of the void in the fixing member described above can be any shape as long as it does not come into contact with the protruding part, but from the viewpoint of weight reduction, it is preferable that the cross-sectional area be as large as possible without affecting the strength. Specifically, when the fixing member is made of a metal such as aluminum, it is preferable that the proportion of the void when viewed in the widthwise cross-section of the fixing member (XZ cross-section in the figure) is 40% or more, more preferably 50% or more, preferably 90% or less, and more preferably 80% or less. Note that when the fixing member has an open part as shown in Figure 1, the proportion of the void refers to the proportion in the cross-section of the part without the open part.

[0027] The material of the fixing member described above only needs to have sufficient rigidity to fix the solar power generation sheet. 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.

[0028] The length (width) of the fixing member described above is not particularly limited as long as it is greater than or equal to the width of the solar power generation sheet. In particular, from the viewpoint of making installation easier by allowing for some leeway in positioning and from the viewpoint of miniaturizing by keeping the length down, the length of the fixing member described above is preferably 1 cm or more of the width of the solar power generation sheet, more preferably 5 cm or more, preferably 15 cm or less, and most preferably 10 cm or less.

[0029] (Embodiment 2) Figure 4 shows a schematic cross-sectional view illustrating another example of the installation structure for the photovoltaic power generation sheet of the present invention. In Embodiment 2, two photovoltaic power generation sheets 2 are fixed to both sides of a single protrusion 1A, and the fixing member 3 that secures the two photovoltaic power generation sheets has compression sections 3A on both sides of the portion that contacts the protrusion, i.e., it has two compression sections 3A. This installation structure allows for the installation of the photovoltaic power generation sheets 2 with high area efficiency. Details of the installation surface 1, photovoltaic power generation sheets 2, and fixing member 3 in Embodiment 2 are the same as in Embodiment 1. [Explanation of symbols]

[0030] 1 Installation surface 1A protrusion 2. Solar power generation sheet 3 Fixing member 3A Compression section 3B Cavity

Claims

1. It comprises an installation surface having a protruding portion, a solar power generation sheet, and a fixing member that sandwiches and fixes the solar power generation sheet to the flat portion of the protruding portion. The fixing member has a compression portion that secures the solar power generation sheet to the protruding portion in close contact with the protruding portion, and a gap portion that does not come into contact with the protruding portion. The compression section has a flat contact surface with the solar power generation sheet. An installation structure for a solar power generation sheet, characterized in that the length of the fixing member is parallel to the extension direction and the length in the width direction is greater than or equal to the length in the width direction of the solar power generation sheet.

2. The solar power generation sheet installation structure according to claim 1, characterized in that the solar power generation sheet has a length in the width direction of 50 cm or more and 2 m or less.

3. The installation structure for a solar power generation sheet according to claim 1 or 2, characterized in that the fixing member has two compression parts, and two solar power generation sheets are fixed to both sides of one protruding part.

4. The solar power generation sheet installation structure according to claim 1 or 2, characterized in that the end of the edge fixed to the fixing member exceeds the vertex of the protruding part.

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