JP2006278671A - Photovoltaic power generation system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a photovoltaic power generation system which has a miniaturized snow guard member which resists the weight of snow and cleans off snow stepwise while having satisfactory performance as a snow guard. <P>SOLUTION: The photovoltaic power generation system has a solar cell module, a frame member attached to the solar cell module and a snow guard member fixed to the frame member. The snow guard member comprises a snow guard for damming snow fall on the solar cell module, and a rotation preventing part for preventing the rotation of the snow guard member. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

The present invention relates to a photovoltaic power generation system, and more particularly to a photovoltaic power generation system having a snow stop member.

  In recent years, interest in global environmental issues has increased, and new energy technology using natural energy has attracted attention. As one of them, there is a strong interest in solar energy-based systems, and in particular, the spread of solar power generation systems to houses has been accelerated, and the installation location has been set up in various environments from Hokkaido to Okinawa. ing.

  A solar power generation system performs solar power module that connects and packages multiple solar cells that convert sunlight into electrical energy, a base on which the solar cell module is installed, and power control that converts direct current to alternating current It consists of a power conditioner and a junction box for wiring. In general, when installing a solar power generation system in a house, there are many cases where an installation stand is installed on the roof of a house, and a solar cell is installed thereon, and the stand uses rails and covers (frame members). Has become commonplace.

  By the way, in snowy regions such as the Tohoku region and the Hokuriku region, snow accumulates on the solar cell module and is dropped naturally or forcibly. In densely populated areas, the snow piled up on the roof may solidify and fall suddenly, causing injuries to neighbors and passers-by. There are many houses.

  In the photovoltaic power generation system, for the same reason, for example, the ribbed cover 4 with the rib portion 4a for snow stop shown in FIG. 6 is adopted. FIG. 7 shows a photovoltaic power generation system to which a cover 4 with a rib for preventing snow is attached. Its structure is as follows. The vertical support rail 5a is screwed to the rafter of the roof, and the horizontal support rail 5b is screwed to the vertical support rail 5a. After attaching the solar module 2 to the lateral support rail 5b, the ribbed cover 4 and the lateral support rail 5b are fixed with screws.

  On the other hand, in areas where snow is scattered, there are few neighbors and passersby and there is a high risk of the roof or houses collapsing due to the weight of snow, so it is necessary to drop the snow accumulated on the roof quickly. In some cases, snow-clad roof tiles are not used.

  Also, even in areas where private houses are dense, there is a risk that the roof and houses will collapse due to the weight of the snow, so it is necessary to stop the snow, but for example, to a certain degree, It is also necessary to install a snow stop.

On the other hand, in the solar power generation system, since the snow stop request varies depending on the region, the cover is provided with a snow stop rib to prevent the snow from falling, and the cover without the rib is used. They are used differently depending on the area. For example, in an area where volcanic ash or the like is likely to be deposited on the solar cell module, if there is a rib, the volcanic ash is volumed on the rib. As a result, the surface of the solar cell module is contaminated by the volcanic ash, which prevents sunlight from being transmitted through the glass on the surface, thereby reducing the power generation capacity of the solar cell module. For this reason, ribless covers are used in areas where volcanic ash accumulates.
JP 2003-239476 A JP 2003-184245 A

  Even in areas where snow protection is necessary, the rib portion 4a raised on the cover of the above-described photovoltaic power generation system can stop snow because the rib is standing on the entire long cover, The structure is such that it can't quickly remove snow that has stopped. Therefore, even if the snow stops, the weather is fine, and the sunlight hits the solar cell module, power generation cannot be performed until the snow is dissolved. In addition, in the season when snow does not fall, it can be considered that dust, dead leaves, etc. accumulate on the rib portion 4a due to the presence of the rib portion 4a, and as a result, the solar cell module becomes dirty and power generation falls. To solve this problem, it is necessary to use a ribbed cover and a ribless bar, which reduces the mass production effect of manufacturing and increases costs. Is necessary, inventory locations are required, and management costs are incurred.

  As a method for solving these problems, for example, a method of attaching a snow stop member having a snow melting function to a cover without a rib (see, for example, Patent Document 1) is conceivable, but one screw hole for fixing is used. In this case, as shown in FIG. 8, since the snow stopper 1 may be loosened due to the weight of snow, the fixing screw of the fixing portion may be loosened, and the snow stopper 1 may be rotated. Usually, two or more screw holes are formed. I need it. For this reason, when two or more screw holes are provided, the snow stop member itself becomes longer than necessary, and an excessive amount of snow is stopped, which is an obstacle to dropping snow quickly. End up.

  Also, as shown in FIG. 9, there is a method of attaching the stepped snow stop member 1 to the frame of the solar cell module (see, for example, Patent Document 2), but in this case as well, many screws must be fixed. Workability will deteriorate. Further, since many screw holes are provided, rainwater or the like enters from the screw fixing portion, and corrosion such as rust is likely to occur, which is not preferable. Moreover, since the fixing | fixed part 1a is provided in the eaves side with respect to the snow stop part 1b, when snow is blocked by the snow stop member, the snow stop member of the fixed part 1a and the snow stop part 1b is due to the weight of snow. A large load is applied to the bent portion (joined portion), and the upper fixing screw 6a attached to the fixing portion is subjected to a shearing stress, and may be damaged when used for a long time.

  In order to solve this problem, an object of the present invention is to provide a snow stop member that is capable of dropping snow step by step while having sufficient performance as a snow stop and can withstand the weight of snow.

  The solar power generation system of the present invention includes a solar cell module, a frame member attached to the solar cell module, and a snow stop member fixed to the frame member, and the snow stop member is on the solar cell module. A snow stop portion that blocks the fall of snow and a rotation prevention portion that prevents rotation of the snow stop member.

  Moreover, the solar power generation system of the present invention is characterized in that, in the above system, the snow stop protrudes upward from the upper surface of the solar cell module.

  Furthermore, the photovoltaic power generation system of the present invention is characterized in that, in the above system, the rotation preventing portion has at least two per one snow stop member.

  Furthermore, the photovoltaic power generation system of the present invention is characterized in that, in the above system, the rotation preventing part extends below a fixed surface between the frame member and the snow stop member.

  Furthermore, the solar power generation system of the present invention is characterized in that in the above system, the one snow stopper member and the frame member are fixed by a single fixing member.

  Moreover, the solar power generation system of the present invention is characterized in that, in the above system, a hole is provided in a part of the snow stop.

  Furthermore, the solar power generation system of the present invention is characterized in that, in the above system, the snow stop member has a notch groove in an attachment portion of the fixing member.

  Furthermore, the solar power generation system of the present invention is characterized in that in the above system, the snow stop member is formed by bending a sheet metal.

  As described above, the photovoltaic power generation system according to the present invention includes a solar cell module, a frame member attached to the solar cell module, and a snow stop member fixed to the frame member, and the snow stop member is Since it has a snow stop portion that blocks the fall of snow on the solar cell module and a rotation prevention portion that prevents rotation of the snow stop member, the snow stop portion prevents the snow fall well. However, by providing an anti-rotation portion, it is possible to hold more snow than in the past without applying a load to the fixing portion between the snow stop member and the frame member more than necessary. Even when it is fixed with only one fixing screw, it can be prevented from rotating left and right due to the weight of snow because the rotation preventing portion is used.

  Therefore, since the snow stop member and the frame member can be fixed by a single fixing member, a compact snow stop member can be adopted, and productivity can be improved.

  Further, by arranging a plurality of snow stop members at intervals along the frame member, it is possible to drop the snow accumulated on the solar cell module more quickly.

  In addition, since it is possible to attach the required number of snow stop members according to the area to be installed and the circumstances around it, it is not necessary to install more snow stop members than necessary, and the weight of the installation stand can be reduced, It is possible to reduce the burden on the roof. Furthermore, compared to a conventional cover with ribs, it uses less material, and usually an inexpensive cover without ribs is standard equipment, and a snow stop member is attached only when snow stop is required. Therefore, it is not necessary to manufacture and manage two kinds of products, rib covers and non-rib covers, as in the past. As a result, it is possible to provide a lower-priced base.

  In addition, in the case of a cover-integrated rib structure as in the prior art, fallen leaves and dust collected on the rib can only fall from both ends of the cover, so if the rib is long, there is a problem that what has been collected once does not fall easily. In the case of the present invention, since the width of the snow stop member can be shortened and the number of the fixing members can be reduced, the fallen leaves and dust collected on the snow stop member can be easily dropped by wind or the like, and the solar module becomes dirty. This has the effect of preventing power generation efficiency from falling. Further, since it is easy to remove, it can be easily replaced due to breakage.

  Furthermore, by providing a hole in a part of the snow stop portion of the snow stop member, it is possible to drop snow earlier, so that snow falls from the hole particularly when snow starts to accumulate, so it accumulates on the solar module. The amount of snow is reduced and it is possible to remove snow earlier than the result.

  Further, by making the attachment hole to the cover provided in the snow stopper member into a notch groove structure, the deviation from the cover hole can be corrected, and workability can be improved. Moreover, the intensity | strength with respect to the weight of snow can be raised by providing the nail | claw part which bent the edge of the fixing | fixed part of the snow stopper member, and hooking a nail | claw part on the edge of a frame member.

  Hereinafter, the snow stop member of the photovoltaic power generation system according to the present invention will be described in detail with reference to the drawings. The present invention is a photovoltaic power generation system including a solar cell module, a frame member, and a snow stop member, and the snow stop member 1 includes a fixed portion 1a, a snow stop portion 1b, and a rotation prevention portion 1c.

  FIG. 1 shows the shape of the snow stop member 1 of the present invention. The snow stopper member includes a snow stopper portion 1b serving as a wall for stopping snow, a fixing portion 1a for fixing to the frame member, and a rotation preventing portion 1c for preventing the snow stopper member from rotating. Moreover, the fixing | fixed part 1a is attached to the ridge side with respect to the snow stop part 1b. Such a snow stop member 1 is formed, for example, by bending a single plate or welding a plurality of members. As a material, a metal member such as SUS or aluminum is preferably used.

  2A and 2B are views when the snow stopper member 1 is attached to the frame member 3, FIG. 2A is a perspective view, and FIG. 2B is a cross-sectional view. The fixing portion 1a is provided with a fixing hole 1d for fixing to the frame member 3, and the support rail 5 having the frame member 3 and the cross joint 7 therebelow is fastened together with a fixing screw 6 (fixing member). It becomes. In addition, for example, two anti-rotation portions 1c come out from under the snow stop portion 1b to prevent the snow stop member 1 from rotating, and at the same time, when the snow is dammed, the frame member 3 is firmly fixed. It has a structure. The snow stopper member 1 is fixed to the frame member 3 by only one fixing screw passing through the fixing hole 1d. In the case where the fixing is performed at only one place, as shown in FIG. 8, it is conceivable to rotate left and right with the fixing point as a fulcrum by the weight of the snow. Therefore, even if a force that rotates to the left and right due to falling snow or the like is applied to the snow stop member, the rotation preventing portion 1c hits the cover and prevents the rotation to the left and right. Further, when the snow is blocked by the snow stop member 1, the snow stop member 1 generates a force that falls down in the eave direction due to the weight of the snow. At this time, the rotation preventing portion 1c may firmly contact and support the frame member. Therefore, a load is not applied to the fixing screw 6 more than necessary, and a force to hold more snow is generated as compared with the case of only screw fixing.

  Further, as shown in FIG. 3, when a part of the snow stop portion 1b of the snow stop member 1 is bent so as to hit the frame member similarly to the rotation prevention portion 1c, the weight of snow is supported from two to three. It becomes a place, and the strength against the weight of snow can be further increased. Moreover, in this structure, a hole will open in the center of a snow stop part, and snow can fall below from this hole. In the initial stage when snow begins to accumulate, the snow falling from this hole reduces the speed of snow accumulation that stops at the snow stop, reducing the amount of snow that stops on the roof within a certain period of time, resulting in faster snow roofing. It can be considered that it can be passed. Moreover, when the accumulated snow falls, it will also fall from this hole, and snow can be dropped from a roof earlier.

  Moreover, as shown in FIG. 4, when the fixing hole 1d for attaching the snow stopper member 1 to the cover is a notch groove portion 1e, it is possible to correct the deviation from the hole of the frame member, thereby improving the workability. Can be made. Further, by providing a claw portion 1f where the end of the fixing portion 1a of the snow stopper member 1 is bent and hooking this portion on the end of the frame member, the strength against the weight of snow is increased.

  Further, since it is not necessary to make the size of the snow stop member 1 as long as that in the prior art, the amount of snow blocking is changed by changing the attachment interval “X” of the snow stop members as shown in FIG. Since the amount of snow falling at a time can be adjusted, it can be set up according to the situation around the house.

It is a perspective view which shows one Embodiment of the snow stop member in the solar energy power generation system of this invention. It is a figure which shows the state which attached the snow stop member in the solar power generation system of this invention to the frame member, (a) is a perspective view, (b) is sectional drawing. It is a perspective view which shows the state which attached other embodiment of the snow stop member in the solar cell system of this invention to the frame member. It is a perspective view which shows other embodiment of the snow stop member in the solar energy power generation system of this invention. It is a figure which shows the snow stop state at the time of attaching the snow stop member in the solar energy power generation system of this invention. It is a perspective view which shows the cover with a rib in the conventional solar power generation system. It is a perspective view which shows the state which attaches the cover with a rib in the conventional solar power generation system. It is a perspective view which shows the state which attached the snow stop member in the conventional solar power generation system to the frame member. It is sectional drawing which shows the snow stop member in the conventional solar power generation system.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1: Snow stop member 1a: Fixing part 1b: Snow stop part 1c: Anti-rotation part 1d: Fixing hole 1e: Notch groove 1f: Claw part 2: Solar cell module 3: Frame member 4: Cover with rib 4a: Rib part 5: Support rail 5a: Vertical rail 5b: Horizontal rail 6: Fixing screw 6a: Upper fixing screw 7: Cross joint

Claims (8)

A solar cell module; a frame member attached to the solar cell module; and a snow stop member fixed to the frame member, wherein the snow stop member blocks snow falling on the solar cell module. And a rotation prevention unit for preventing rotation of the snow stop member. The solar power generation system according to claim 1, wherein the snow stopper protrudes upward from the upper surface of the solar cell module. The solar power generation system according to claim 2, wherein at least two of the rotation prevention units are provided for one snow stop member. The solar power generation system according to any one of claims 1 to 3, wherein the rotation prevention unit extends below a fixed surface between the frame member and the snow stop member. The solar power generation system according to claim 1, wherein the snow stop member and the frame member are fixed by a single fixing member. The solar power generation system according to any one of claims 1 to 5, wherein a hole is provided in a part of the snow stop. The solar power generation system according to any one of claims 1 to 6, wherein the snow stop member has a notch groove in an attachment portion of the fixing member. The solar power generation system according to any one of claims 1 to 7, wherein the snow stop member is formed by bending a sheet metal.

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