JP4679409B2 - Grounding structure and grounding fixture for solar cell module - Google Patents

Description

  The present invention relates to a solar cell module mounting structure and a grounding fixture that are installed on the roof of a building.

The problem of the global warming phenomenon due to the increase in CO ₂ in recent years is in a serious situation, and depletion of resources has become a serious problem as energy consumption is predicted worldwide. Therefore, solar energy that does not emit CO _2, has limited resources, and has a low environmental load occupies an important position. A solar cell module that converts this solar energy into electricity is currently attracting attention.

  A grid-linked residential solar power generation system in which a solar cell module is installed in a general house is becoming widespread, and this system connects a plurality of solar cell modules in series and parallel with a stand installed on a roof, It is designed to be installed on the gantry.

  Solar cell modules are used by being installed on the roof, etc., but it is necessary to take grounding to avoid damage due to electric leakage in the event that the insulation measures of the solar cell module are damaged. The battery module must be electrically connected to the cradle.

  As shown in FIG. 9, the conventional electrical connection method is such that engagement grooves 121c are provided on the outer side surfaces of the long-side frame members 121 of the solar cell modules 110 arranged adjacent to each other. Each long side frame member 121 is placed on the upper surface 137 a of 137. An inter-module cover 147 is disposed between the long-side frame members 121, and each side edge portion thereof is fitted in the engagement groove 121c. The inter-module cover member 147 is attached to the gantry 137 with bolts 142. A conductive washer 143 is fitted to the bolt 142, and when the bolt 142 is attached to the mount 137, each engagement groove 121b and the inter-module cover member 147 are brought into a conductive state (Patent Document 1).

  As shown in FIG. 10, the other conventional electrical connection method is that the module and the pedestal can be easily grounded by attaching an H-shaped grounding fixture 201 to the vertical rail (Patent Document 2). .

JP 09-250219 A JP 11-324259 A

  However, in the conventional electrical connection using the metal fittings, the ground connection between the solar cell modules and the ground connection between the solar cell module and the gantry are grounded using a plurality of metal fittings, which makes the construction complicated and expensive. There is also a problem in economic efficiency, and the method of connecting the earth between the solar cell module and the base by inserting metal fittings into the ground is that rainwater enters between the solar cell module and the base, and then the rainwater remains due to capillary action, causing corrosion due to electric corrosion. There was a problem that long-term ground connection could not be obtained.

  Therefore, in view of the above situation, the present invention provides a solar cell module mounting structure and a grounding fixture that can realize a ground for electrical connection between a solar cell module and a gantry supporting the solar cell module with a simple configuration at low cost. The issue is to provide.

The mounting structure of the solar cell module according to the present invention includes: “a horizontal beam having a mounting portion for mounting the solar cell module disposed on the roof on both ends, and the mounting portion described above of the horizontal beam. The pressed solar cell modules can be pressed simultaneously from above and have a through hole penetrating in the vertical direction, a bolt inserted from above into the through hole of the press member, and the bolt screwed together The solar cell modules and the horizontal beam are connected to each other by fastening the bolt that penetrates the holding member to the bolt receiving unit. ; and a ground fixing member for electrically connecting is fixed at the same time, the ground fixing bracket, the bolt receiving portion extending upward from the body portion is formed, the lower and front of the tip of the solar cell module Comprising a rising portion in contact with the inner surface above the top side groove in the rungs "it is characterized.

  Here, as the “horizontal rail”, it is only necessary to have a mounting portion on which the end portion of the solar cell module can be placed and an upper side groove portion extending in the longitudinal direction. In particular, the “upper side groove portion” has an opening. It is desirable that the cross-section is in the form of a C-channel with the portion facing upward, and that the grounding fixture to be inserted therein is not removed from directions other than the longitudinal direction of the cross rail. The horizontal rail may further include an attachment fixing part for attaching to the roof in addition to the placement part and the upper side groove part.

  Further, it is desirable that the “earth fixing bracket” has a form (shape) that cannot be inserted into or removed from the upper side groove portion from a direction other than the longitudinal direction of the horizontal rail. In addition, it is desirable to have a configuration that can contact both the horizontal rail and the solar cell module. For example, in addition to the bolt receiving portion, the horizontal rail contact portion that contacts the horizontal rail and the solar cell that contacts the solar cell module What further provided with the module contact part is desirable. In addition, the site | part which fixes a solar cell module and a horizontal rail, and the site | part which electrically connects a solar cell module and a horizontal beam may be the same site | parts, and may be a different site | part.

  According to the present invention, when the presser member and the ground fixing bracket are fastened by the bolt, the presser member and the ground fixing bracket come close to each other, and the solar cell module disposed between them and the upper side of the upper side groove portion of the horizontal rail are pressed down. Adjacent solar cell modules can be fixed to the horizontal beam by being sandwiched between the member and the earth fixing bracket, and the earth fixing bracket is in strong contact with the horizontal beam and the solar cell module, via the earth fixing bracket. They are electrically connected to each other. As a result, the solar cell module can be fixed to the horizontal beam only by fastening the holding member and the ground fixing bracket to each other with a bolt, and the adjacent solar cell modules and the horizontal beam can be connected to each other by one ground fixing bracket. Since they can be electrically connected, the labor involved in installing the solar cell module can be simplified, the number of parts can be reduced, and the cost can be reduced.

  According to the present invention, the grounding fixture is provided with a rising portion that comes into contact with the lower side of the solar cell module and the upper side of the upper side groove of the horizontal rail. As a result, when the holding member and the earth fixing bracket are fastened by the bolt, the earth fixing bracket is pulled upward, and the rising portion, the solar cell module and the horizontal rail come into contact more firmly, and the earth fixing bracket On the other hand, the electrical connection between the solar cell module and the horizontal rail becomes stronger, and the solar cell module can be reliably grounded.

  By the way, when the contact portion between the earth fixing bracket and the solar cell module or crosspiece is immersed in a conductive liquid such as seawater or rainwater contained in the sea breeze, the type of metal in contact is different. , Electricity flows from one metal to the other and corrodes the metal, so-called electrocorrosion occurs, the metal corrodes, the contact between them becomes incomplete, the electrical connection is released There is a problem. In particular, when the solar cell module or the horizontal rail is brought into contact and electrically connected, there is a problem in that the contact portion is easily immersed in rainwater and the like, and electric corrosion occurs.

  However, according to the present invention, since the rising portion of the earth fixing bracket is brought into contact with the lower side of the solar cell module or the side rail, it is difficult to immerse the contact portion in a liquid such as rainwater. However, since the liquid is naturally discharged by gravity, it is possible to prevent the occurrence of electrolytic corrosion as much as possible, and it is possible to reliably take the ground and improve the durability.

The mounting structure of the solar cell module according to the present invention is “having a protruding portion that is formed at the tip of the rising portion and pierces the lower side of the solar cell module and the upper side of the upper side groove portion of the horizontal rail ” It is characterized by that.

  According to the present invention, the grounding fixture is provided with a protruding portion that pierces the solar cell module or the horizontal rail. As a result, the projecting portion pierces the solar cell module or the horizontal rail, so that they can be reliably electrically connected to the grounding fixture. Moreover, even if the surface of the solar cell module or the like has an oxide film such as alumite, a paint by painting, or a surface protective film, the projecting portion breaks through the film and becomes conductive. Since it can be electrically connected by contacting a high part, it can be suitably grounded even for a solar cell module or a horizontal rail having a coating layer on the surface.

The earth fixing bracket according to the present invention is “inserted into the upper side groove portion of the horizontal rail having a mounting portion for mounting the solar cell modules disposed on the roof at both ends and an upper side groove portion extending in the longitudinal direction. The solar cell modules and the horizontal rails are fastened by fastening the solar cell modules placed on the mounting portion of the horizontal rails from above by means of a pressing member and a bolt. Are fixed at the same time and electrically connected to each other, a bolt receiving portion for receiving the bolt, a main body portion on which the bolt receiving portion is formed, extending upward, and a tip thereof on the lower side of the solar cell module and said upper groove of the inner surface upper contactable rising portion in the lateral beam, are formed at least at the distal end of the rising portion, of the upper groove on the lower side and the lateral beam of the solar cell module It includes a projecting portion which sticks to the face upper "be characterized.

  ADVANTAGE OF THE INVENTION According to this invention, it can be set as an earth | ground fixing metal fitting suitable for arrange | positioning a solar cell module on a roof, and there can exist an effect similar to the above-mentioned.

  As described above, according to the present invention, it is possible to provide a solar cell module mounting structure and a grounding fixture that can be grounded while fixing the solar cell module and the horizontal rail without using a plurality of brackets. .

  Hereinafter, a solar cell module mounting structure that is the best mode for carrying out the present invention will be described in detail with reference to FIGS. 1 to 9. Fig.1 (a) is a top view of the earth fixing metal fitting used for the attachment structure of the solar cell module of this invention, (b) is a front view of (a), (c) is a side view of (a). It is. FIG. 2 is a perspective view showing a grounding fixture used in the solar cell module mounting structure of the present invention. FIG. 3 is a perspective view in which the grounding fixture shown in FIG. 1 is inserted into the horizontal rail used in the solar cell module mounting structure of the present invention. Furthermore, FIG. 4 is a perspective view of placing the solar cell module on the horizontal rail. FIG. 5 is a perspective view of a cover member pressed from the upper side of the solar cell module placed on the horizontal rail and a bolt penetrating the cover member. FIG. 6 is a cross-sectional view of a state in which the grounding fixture shown in FIG. 1 is inserted into the horizontal rail and the solar cell module is placed on the cover member.

  First, the earth fixture used in the solar cell module mounting structure of this example will be described. As shown in FIGS. 1A, 1 </ b> B, 1 </ b> C, and 2, the grounding fixture 1 is formed in a shape having rising surfaces 3, 4 bent upward from the plane portion 2. . Protruding portions 5 and 6 are provided at the tip of the rising portion, and a bolt receiving portion 7 is provided on the flat surface portion 2.

  The flat surface portion 2 of the grounding fixture 1 has a rectangular shape, the rising portion 3 is formed substantially perpendicular to the short side of the flat surface portion 2, and the rising width is about 15 mm in this example. The rising portion 4 is formed substantially perpendicular to the long side of the plane portion 2 and its rising width is about 30 mm in this example. And the protrusion parts 5 and 6 with which the front-end | tip of the rising parts 3 and 4 were equipped are formed in the shape of a pointed triangle which becomes thin as it goes upwards. Moreover, the bolt receiving part 7 is formed in the cylindrical shape extended upwards from the center of the plane part 2, and the internal thread screwed together with a volt | bolt is formed in the inner surface.

  The earth fixing bracket 1 is formed by press-molding a sheet metal. For example, the grounding fixture 1 is a small piece for forming the protruding portions 5 and 6 and the bolt receiving portion 7 in a state where the rising portions 3 and 4 are expanded with respect to the flat portion 2. After punching together with the holes, the rising parts 3 and 4 are bent substantially perpendicularly to the flat part 2, and the small hole at the center of the flat part 2 is expanded by burring and becomes the bolt receiving part 7. The grounding fixture 1 is manufactured by forming a cylindrical portion and engraving a predetermined female screw on the inner surface of the cylindrical portion. In addition, said process is an example and you may manufacture the earth fixture 1 by another process and method. In this example, the rising portions 3 and 4 are shown to rise substantially perpendicular to the plane portion 2, but may be formed so as to be inclined obliquely.

  The projecting portion 5 of the ground fixing bracket has a shape in which the long side (isosceles side) of an isosceles triangle is an inclined surface and the inclined surface faces inward, and the height is preferably 1.5 mm. There is a case where a gap with the horizontal beam 8 is generated due to an error in the vertical direction when the module 19 is installed, and the protruding part may not reach. When the module 19 is 1.5 mm or more, the solar cell module 19 is lifted by the protruding part, resulting in a step. May get worse. Further, when the long side of the isosceles triangle is a slope, the tip of the projecting portion is arranged on the outermost side, and the solar cell module 19 can be electrically connected even if an error in the horizontal direction occurs. If the sides are not inclined, the tip of the projecting portion is disposed slightly inside than the outside, so that if the solar cell module 19 has an error in the left-right direction, it cannot be electrically connected. In addition, the material of the earthing fixture 1 is, for example, a steel plate, a plate thickness of 2.3 mm, and silver.

  Next, the horizontal rail 8 used in the solar cell module mounting structure of this example will be described. As shown in FIG. 3, the horizontal rail 8 is a vertically long rectangle, has a mounting portion 9 at the top, and is linear in the longitudinal direction in a shape related to the rising portion 4 of the earth fixing bracket 1 along the longitudinal direction. Is formed in a shape related to the side surface shape of the frame of the solar cell module 19.

  The cross-sectional shape of the horizontal beam 8 is a vertically long rectangle, the upper side is opened, and there are mounting parts 9 on the upper left and right sides extending about 1/4 of the width of the horizontal beam toward the inner side of the horizontal beam. There is a short line extending downward from the tip of the upper portion and an upper side groove portion 10 having a substantially C-shape extending in parallel with the mounting portion 9 described above. The material of the horizontal rail 8 is aluminum and the color is silver.

  Then, the solar cell module 19 used for the attachment structure of the solar cell module of this example is demonstrated. As shown in FIG. 5, the solar cell module 19 is a horizontally long rectangle, and has an engagement groove 20 provided on the outer surface of the frame.

  The cross-sectional shape of the engagement groove 20 is L-shaped, and has a shape such that the L-shape is turned 90 degrees and the end 21 is disposed on the upper side. The material of the frame of the solar cell module 19 is aluminum and the color is black.

  Next, the pressing member 12 used in the solar cell module mounting structure of this example will be described. As shown in FIG. 5, the pressing member 12 is a horizontally long rectangle, the flat surface portion 13 is formed in a flat shape, and has concave concave portions 14 and 15 on the back surface, the left surface, and the right surface, and a solar cell module 19. It has a presser portion 16 that presses the engagement groove portion 20 of the presser. Further, the flat portion 13 has a through hole 17 in the vertical direction.

  The recessed portion 15 of the holding member 12 has a recessed dimension related to the height of the end portion 21 of the engaging groove portion 20 of the solar cell module 19, and the length of the roof when the solar cell module 19 is disposed on the roof. If an arrangement error occurs in the direction, the recess 15 interferes with the end 21 of the engagement groove 20 of the solar cell module 19 to suppress the arrangement error. If the arrangement error occurs, the end of the engagement groove 20 of the solar cell module 19 When 21 is arrange | positioned under the press part 16, when the press member 12 deform | transforms and rises by the edge part 21 of the engagement groove part 20, a malfunction can be discovered by visual observation during construction. The material of the pressing member 12 is aluminum and the color is black.

  Next, the mounting structure of the solar cell module in this example will be described in detail along the construction procedure. The solar cell module construction method of the present embodiment is a first procedure in which the grounding fixture 1 shown in FIG. 1 is inserted into the upper side groove portion 10 from one of the left and right ends of the cross rail 8 as shown in FIG. Slide to a fixed position.

  In the second procedure, as shown in FIG. 4, the engaging groove 20 of the solar cell module 19 is mounted on the mounting portion 9 of the crosspiece 8.

  In the third procedure, as shown in FIG. 5, the bolt 18 is inserted into the through hole 17 of the holding member 12 from the upper side, the ground fixing bracket 1 is slid to adjust the position with the through hole 17, and the bolt receiving portion 7. And are fixed to the solar cell module 19 and the cross rail 8.

  At this time, as shown in FIG. 6, the grounding fixture 1 is lifted upward by the bolts 18, the pressing member 12 approaches each other, and the upper side of the upper side groove portion of the solar cell module and the horizontal rail disposed therebetween. Are sandwiched between the holding member and the ground fixing metal fitting, and the projecting portion 5 sticks to the back side of the engaging groove portion 20 of the solar cell module 19 to break the surface protective film of the engaging groove portion 20 and electrically connect to the ground fixing metal fitting 1. Further, the surface protective film on the upper side 11 of the upper side groove portion 10 of the horizontal rail 8 is broken to be electrically connected to the grounding fixture 1.

  As described above, according to the present embodiment, the earth fixing metal fitting 1 enables the solar cell module to be fixed and grounded at the same time without using a plurality of metal fittings as in the prior art, thereby reducing the cost. be able to. In particular, a higher ground connection can be achieved by using a material having excellent conductivity.

  The present invention has been described with reference to preferred embodiments. However, the present invention is not limited to these embodiments, and various modifications can be made without departing from the spirit of the present invention as described below. And design changes are possible.

  That is, in the present embodiment, the bolt 18 is screwed into the bolt receiving portion 7 of the ground fixing bracket 1, but the bolt 23 is inserted into the bolt receiving portion 7 of the ground fixing bracket 1 as shown in FIG. The grounding fixture 22 screwed together may be used. Thereby, adjustment with respect to the through-hole 17 of the pressing member 12 can be performed easily.

  Further, in the present embodiment, the bolt 18 is screwed into the bolt receiving portion 7 of the grounding fixture 1, but a through hole 26 is provided in the flat portion 25 of the grounding fixture 1 as shown in FIG. 27 may be a grounding fixture 24 that is inserted from below and fixed by spot welding 28. Thereby, adjustment with respect to the through-hole 17 of the pressing member 12 can be performed easily.

(A) is a top view of the earth fixing metal fitting used for the solar cell module mounting structure of the present invention, (b) is a front view of (a), and (c) is a side view of (a). . It is a perspective view which shows the earth fixing metal fitting used for the attachment structure of the solar cell module of this invention. It is a perspective view which inserts the earth | ground fixing | fixed metal fitting shown in FIG. 1 in the crosspiece used for the attachment structure of the solar cell module of this invention. It is a perspective view which mounts a solar cell module on a horizontal rail. It is a perspective view of the cover member pressed from the upper side of the solar cell module mounted on the horizontal rail, and the bolt that penetrates the cover member. It is sectional drawing of the state which penetrated the earth | ground fixing | fixed metal fitting shown in FIG. 1 in the horizontal rail, and mounted the solar cell module with the cover member. (A) is a perspective view of a shape different from the grounding fixture of FIG. 1, and (b) is a cross-sectional view of a shape different from the grounding fixture of FIG. (A) is a perspective view of a shape different from the grounding fixture of FIG. 1, and (b) is a cross-sectional view of a shape different from the grounding fixture of FIG. It is sectional drawing which shows the attachment structure of the conventional solar cell module. It is a figure which shows the conventional earth metal fittings different from FIG.

DESCRIPTION OF SYMBOLS 1 Grounding fixture 2 Flat part 3 Rising part 4 Rising part 5 Protruding part 6 Protruding part 7 Bolt receiving part 8 Lateral cross 9 Placement part 10 Upper side groove part 11 Upper side groove part 12 Holding member 13 Flat part 14 Indented part 15 Indented part 16 Presser part 17 Through hole 18 Bolt 19 Solar cell module 20 Engaging groove part 21 End part 22 Earth fixing bracket 23 Bolt 24 Ground fixing bracket 25 Flat part 26 Through hole 27 Bolt 28 Spot welding

Claims (3)

A mounting portion for mounting the solar cell module disposed on the roof at both ends, and a horizontal rail having an upper side groove portion extending in the longitudinal direction;
A holding member having a through-hole penetrating in the vertical direction while simultaneously pressing the solar cell modules placed on the placement portion of the horizontal rail from above;
A bolt inserted through the through hole of the pressing member;
A bolt receiving portion for receiving the bolt; and being inserted into the upper side groove portion of the horizontal rail so as to be positioned below the pressing member, and fastening the pressing member and the bolt receiving portion by the bolt. The solar cell module and the horizontal rail are fixed at the same time and comprise a grounding fixture for electrical connection ,
The earth fixing bracket is
The sun includes a rising portion that extends upward from a main body portion on which the bolt receiving portion is formed, and that has a tip that contacts a lower side of the solar cell module and an upper surface of the upper side groove portion of the horizontal rail. Battery module mounting structure. The earth fixing bracket is
2. The solar cell module according to claim 1, wherein the solar cell module has a protruding portion formed at a tip of the rising portion and piercing the lower side of the solar cell module and the upper surface of the upper side groove portion of the horizontal rail. Mounting structure. The solar cell module disposed on the roof can be inserted into a mounting portion for mounting the solar cell module at both ends, and an upper side groove portion of the horizontal beam having an upper side groove portion extending in the longitudinal direction. The solar cell modules mounted on the mounting unit are fastened simultaneously from above via a holding member and a bolt, so that the solar cell modules and the horizontal rail are simultaneously fixed and electrically connected. Earth fixing bracket,
  A bolt receiving portion for receiving the bolt;
  A rising portion that extends upward from a main body portion in which the bolt receiving portion is formed, and whose tip can contact the lower side of the solar cell module and the inner surface upper side of the upper side groove portion in the horizontal rail,
  A protrusion that is formed at least at the tip of the rising portion and pierces the lower side of the solar cell module and the upper surface of the upper side groove in the horizontal rail;
An earth fixing metal fitting characterized by comprising:

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