CN110868150A - Connection structure of crystalline silicon solar dual-glass assembly - Google Patents

Connection structure of crystalline silicon solar dual-glass assembly Download PDF

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Publication number
CN110868150A
CN110868150A CN201911190725.0A CN201911190725A CN110868150A CN 110868150 A CN110868150 A CN 110868150A CN 201911190725 A CN201911190725 A CN 201911190725A CN 110868150 A CN110868150 A CN 110868150A
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CN
China
Prior art keywords
plate
locking
frame
rib
locking convex
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Pending
Application number
CN201911190725.0A
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Chinese (zh)
Inventor
曾仲
聂俊波
周豪浩
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Wuxi Suntech Power Co Ltd
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Wuxi Suntech Power Co Ltd
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Priority to CN201911190725.0A priority Critical patent/CN110868150A/en
Publication of CN110868150A publication Critical patent/CN110868150A/en
Pending legal-status Critical Current

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    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02SGENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
    • H02S30/00Structural details of PV modules other than those related to light conversion
    • H02S30/10Frame structures
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02SGENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
    • H02S20/00Supporting structures for PV modules
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00Energy generation through renewable energy sources
    • Y02E10/50Photovoltaic [PV] energy

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  • Photovoltaic Devices (AREA)

Abstract

The invention relates to a crystalline silicon solar double-glass component connecting structure which comprises a component frame, a pressing clamp and an integral supporting frame, wherein the component frame is provided with a plurality of supporting holes; the integral supporting frame is provided with component frames, a pressing clamp is fixed on the integral supporting frame between two adjacent component frames, and the component frames are pressed on the integral supporting frame through the pressing clamp; each assembly frame is composed of two long-edge-direction frame profiles, two wide-edge-direction frame profiles and connecting corner connectors. The invention greatly reduces the cost, improves the strength of the dual-glass assembly, is convenient and simple to install, ensures the installation reliability and reduces the installation cost.

Description

Connection structure of crystalline silicon solar dual-glass assembly
Technical Field
The invention relates to a crystalline silicon solar double-glass component connecting structure, and belongs to the technical field of crystalline silicon solar component structures.
Background
At present, there are two general schemes in the design of industry solar photovoltaic dual glass assembly, its scheme one: the frameless double-glass assembly with the sandwich structure is structurally characterized in that front plate glass, a packaging adhesive film, a battery piece group string, a packaging adhesive film and rear plate glass are laminated and crosslinked into a whole, the periphery of the whole is not protected by a metal frame structure, and the whole is fastened on a metal purline through a pressing block in the installation process or hung on a support structure through structures such as a sticking hook and the like; the double-glass assembly has many problems in the implementation of the current project, such as extremely high breakage rate, weak bearing capacity of an installation system and the like, so that the use and maintenance cost of the assembly is greatly increased, and the application environment of the assembly is also limited; therefore, at present, some manufacturers adopt another scheme, namely scheme two: the frame structure who adorns one set and single glass assembly the same type on frameless dual glass assembly basis, the breakage rate of this subassembly of so not only greatly reduced greatly improves dual glass assembly intensity simultaneously, makes it be applicable to all kinds of environment, but scheme two also has certain problem, if with high costs and dual glass assembly weight overweight scheduling problem.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide the crystalline silicon solar dual-glass component connecting structure which is convenient to install, can reduce the installation cost and can ensure the installation reliability.
According to the technical scheme provided by the invention, the crystalline silicon solar double-glass assembly connecting structure comprises an assembly frame, a pressing clamp and an integral supporting frame; the integral supporting frame is provided with component frames, a pressing clamp is fixed on the integral supporting frame between two adjacent component frames, and the component frames are pressed on the integral supporting frame through the pressing clamp; each assembly frame is composed of two long-edge-direction frame profiles, two wide-edge-direction frame profiles and a connecting corner brace;
the frame section comprises a bottom plate, a middle plate, a top plate, a right support plate, a middle support plate, a left convex edge of the bottom plate, a right convex edge of the bottom plate and a convex edge of the middle plate; the middle plate is arranged above the bottom plate, the top plate is arranged above the middle plate, the right end part of the bottom plate is connected with the right end part of the middle plate through a right supporting plate, the middle part of the bottom plate is connected with the middle part of the middle plate through a middle supporting plate, the left end part of the middle plate is connected with the left end part of the top plate through a left supporting plate, the left edge of the upper surface of the bottom plate is connected with a left bottom plate convex edge, the upper surface of the bottom plate between the right supporting plate and the middle supporting plate is connected with a right bottom plate convex edge, and the lower surface of the middle plate between the right supporting plate and the middle supporting plate is connected with a;
in the direction from left to right, the left section of the middle plate is arranged in a manner of gradually increasing the thickness, the left section of the top plate is arranged in a manner of gradually decreasing the thickness, and the right section of the top plate is arranged in a manner of gradually decreasing the thickness;
the right supporting plate, the middle supporting plate, the bottom plate and the middle plate are combined to form an angle code cavity, and the connecting angle code is arranged in the angle code cavity; the clamp pressing cavity is formed by combining a left convex edge of the bottom plate, the middle support plate and the middle plate;
the pressing clamp comprises a clamp base plate, a first locking convex rib and a second locking convex rib; the clamp base plate is a long strip-shaped plate body, the left side edge and the right side edge of the lower surface of the clamp base plate are integrally connected with a first locking convex edge, the lower surface of the clamp base plate between the two first locking convex edges is integrally connected with a left second locking convex edge and a right second locking convex edge, the length directions of the clamp base plate, the first locking convex edge and the second locking convex edge are the same, the left side wall and the lower surface of the first locking convex edge are in fillet transition, the left side wall and the lower surface of the second locking convex edge are in fillet transition, the two first locking convex edges are equal in height, the two second locking convex edges are equal in height, the height of the first locking convex edge is smaller than that of the second locking convex edge, the width of the first locking convex edge is larger than that of the second locking convex edge, and a locking hole is formed in the clamp;
the first locking convex edge is clamped into the clamp pressing cavity of the frame section bar, the second locking convex edge is abutted against the side wall of the frame section bar, the pressing clamp is fixed on the integral supporting frame through the locking bolt screwed into the locking hole, and the assembly frame is pressed on the integral supporting frame through the pressing clamp.
The upper surface of the left section of the middle plate is provided with a middle plate inclined plane which is high at the left and low at the right, so that the left section of the middle plate is arranged with thickness gradually increasing in the direction from left to right.
The left section lower surface of the top plate is provided with a top plate lower inclined surface with a lower left part and a higher right part, so that the left section of the top plate is arranged in a thickness reducing mode in the direction from left to right.
The upper surface of the right section of the top plate is provided with a top plate upper inclined plane which is high at the left and low at the right, so that the right section of the top plate is arranged with thickness gradually reduced in the direction from left to right.
The left end of bottom plate, middle part board and top plate aligns, and the right-hand member portion of middle part board stretches out right backup pad a section distance, and the right-hand member position of top plate is in middle part board bead position.
The left first locking convex edge and the right first locking convex edge are arranged in a bilateral symmetry mode along the bilateral symmetry center line of the clamp base plate.
The left second locking convex edge and the right second locking convex edge are arranged in a bilateral symmetry mode along the bilateral symmetry center line of the clamp base plate.
The upper surface of the clamp base plate corresponding to the positions of the first locking convex rib on the left side and the second locking convex rib on the left side is provided with a first inclined plane which is lower on the left side and higher on the right side; the upper surface of the clamp base plate at the position corresponding to the first locking convex rib at the right side and the second locking convex rib at the right side is provided with a first inclined plane which is higher at the left side and lower at the right side.
The degree of an included angle formed by the first inclined plane and the upper surface of the clamp substrate is 10-20 degrees.
The invention greatly reduces the cost, improves the strength of the dual-glass assembly, is convenient and simple to install, ensures the installation reliability and reduces the installation cost.
Drawings
Fig. 1 is a schematic structural view of the present invention.
Fig. 2 is a cross-sectional view of the profile of the present invention.
Fig. 3 is a view showing a state of use of the frame section of the present invention.
Fig. 4 is a front view of the hold down clamp of the present invention.
Fig. 5 is a left side view of the hold down clamp of the present invention.
Fig. 6 is a right side view of the hold down clamp of the present invention.
Fig. 7 is a bottom view of the hold down clamp of the present invention.
Fig. 8 is a perspective view of a hold down clamp of the present invention.
Fig. 9 is a view showing a state in which the pressing jig of the present invention is used.
Detailed Description
The present invention will be further described with reference to the following specific examples.
The invention relates to a crystalline silicon solar energy dual-glass assembly connecting structure, which comprises an assembly frame 1, a pressing clamp 3 and an integral supporting frame 5; the assembly frame 1 is arranged on the integral supporting frame 5, a pressing clamp 3 is fixed on the integral supporting frame 5 between two adjacent assembly frames 1, and the assembly frames 1 are pressed on the integral supporting frame 5 through the pressing clamp 3; each assembly frame 1 is composed of two long-edge-direction frame profiles, two wide-edge-direction frame profiles and a connecting corner brace;
the frame section comprises a bottom plate 11, a middle plate 12, a top plate 13, a right support plate 14, a middle support plate 15, a left support plate 16, a bottom plate left rib 17, a bottom plate right rib 18 and a middle plate rib 19; a middle plate 12 is arranged above the bottom plate 11, a top plate 13 is arranged above the middle plate 12, the right end of the bottom plate 11 is connected with the right end of the middle plate 12 through a right support plate 14, the middle of the bottom plate 11 is connected with the middle of the middle plate 12 through a middle support plate 15, the left end of the middle plate 12 is connected with the left end of the top plate 13 through a left support plate 16, a bottom plate left convex rib 17 is connected with the left edge of the upper surface of the bottom plate 11, a bottom plate right convex rib 18 is connected with the upper surface of the bottom plate 11 between the right support plate 14 and the middle support plate 15, and a middle plate convex rib 19 is connected with the lower surface of the middle plate 12 between the right support plate 14 and the middle support plate 15;
in the direction from left to right, the left section of the middle plate 12 is arranged with gradually increasing thickness, the left section of the top plate 13 is arranged with gradually decreasing thickness, and the right section of the top plate 13 is arranged with gradually decreasing thickness;
the right support plate 14, the middle support plate 15, the bottom plate 11 and the middle plate 12 are combined to form an angle code cavity 23, and the connecting angle code is installed in the angle code cavity 23; the clamp pressing cavity 24 is formed by combining the bottom plate left rib 17, the bottom plate 11, the middle support plate 15 and the middle plate 12;
the pressing clamp 3 comprises a clamp base plate 31, a first locking rib 32 and a second locking rib 33; the clamp base plate 31 is a strip-shaped plate body, the left side edge and the right side edge of the lower surface of the clamp base plate 31 are integrally connected with a first locking convex rib 32, the lower surface of the clamp base plate 31 between the two first locking convex ridges 32 is integrally connected with a left second locking convex ridge and a right second locking convex ridge 33, the length directions of the clamp base plate 31, the first locking convex ridge 32 and the second locking convex ridge 33 are the same, the left side wall and the lower surface of the first locking convex ridge 32 are in circular-angle transition, the left side wall and the lower surface of the second locking convex ridge 33 are in circular-angle transition, the two first locking convex ridges 32 are equal in height, the two second locking convex ridges 33 are equal in height, the height of the first locking convex ridge 32 is smaller than that of the second locking convex ridge 33, the width of the first locking convex ridge 32 is larger than that of the second locking convex ridge 33, the clamp base plate 31 between the left and right second locking ribs 33 is provided with a locking hole 34.
The upper surface of the left section of the middle plate 12 has a middle plate slope 20 that is higher on the left and lower on the right, so that the left section of the middle plate 12 is arranged with a gradually increasing thickness in the direction from the left to the right.
The lower surface of the left section of the top plate 13 is provided with a top plate lower inclined surface 21 which is lower at the left and higher at the right, so that the left section of the top plate 13 is arranged with the thickness gradually reduced in the left-to-right direction.
The upper surface of the right section of the top plate 13 is provided with a top plate upper inclined plane 22 which is higher at the left and lower at the right, so that the right section of the top plate 13 is arranged in a thickness reducing manner in the direction from left to right.
The bottom plate 11, middle plate 12 are aligned with the left end of the top plate 13, the right end of the middle plate 12 extends to the right beyond the right support plate 14 by a distance, and the right end of the top plate 13 is located at the middle plate rib 19.
The left and right first locking ribs 32 are symmetrically arranged along the left and right center line of the clamp base plate 31.
The left and right second locking projected ridges 33 are symmetrically arranged along the left and right center line of the clamp base plate 31.
The upper surface of the clamp base plate 31 at the position corresponding to the left first locking rib 32 and the left second locking rib 33 is provided with a left lower right higher first inclined surface 35; the upper surface of the clamp base plate 31 at positions corresponding to the right first locking projected ridges 32 and the right second locking projected ridges 33 has left-higher and right-lower first inclined surfaces 35.
The included angle formed by the first inclined surface 35 and the upper surface of the clamp substrate 31 is 10-20 degrees.
In the invention, the right support plate 14, the middle support plate 15, the bottom plate 11 and the middle plate 12 are combined to form the corner brace cavity 23, and the bottom plate right convex rib 18 and the middle plate convex rib 19 are matched with the connecting corner brace to form a positioning structure, so the assembly is simple and convenient, and the appearance is attractive.
In the invention, a clamp pressing cavity 24 is formed by combining the bottom plate left convex rib 17, the bottom plate 11, the middle support plate 15 and the middle plate 12. When in use, the first locking convex ridge is clamped 31 in the clamp pressure application cavity 24, the second locking convex ridge 32 is propped against the side wall of the frame profile, the two component frames 1 are connected together through the pressing clamp 3,
according to the invention, the middle plate 12, the left support plate 16 and the top plate 13 are combined to form the sealant bonding assembly cavity 25, the right end of the top plate 13 is located at the position of the convex edge 19 of the middle plate, so that the sealant bonding assembly cavity forms a sealant overflow structure, single-component sealant is filled in the sealant bonding assembly cavity, then four edges of the frameless dual-glass assembly are sequentially inserted, and the equipment is completed.
The first locking convex ridge 32 is clamped into the clamp pressure application cavity 24 of the frame profile, the second locking convex ridge 33 is abutted against the side wall of the frame profile 1, the locking bolt 6 is screwed into the locking hole 34 to fix the pressing clamp 3 on the integral support frame 5, and the pressing clamp 3 presses the assembly frame 1 on the integral support frame 5.

Claims (9)

1. The utility model provides a two glass assembly connection structure of crystalline silicon solar energy, characterized by: the device comprises an assembly frame (1), a pressing clamp (3) and an integral supporting frame (5); the assembly frame (1) is arranged on the integral support frame (5), a pressing clamp (3) is fixed on the integral support frame (5) between two adjacent assembly frames (1), and the assembly frames (1) are pressed on the integral support frame (5) through the pressing clamp (3); each assembly frame (1) is composed of two frame profiles in the long edge direction, two frame profiles in the wide edge direction and a connecting corner brace;
the frame section comprises a bottom plate (11), a middle plate (12), a top plate (13), a right support plate (14), a middle support plate (15), a left support plate (16), a bottom plate left convex rib (17), a bottom plate right convex rib (18) and a middle plate convex rib (19); a middle plate (12) is arranged above the bottom plate (11), a top plate (13) is arranged above the middle plate (12), the right end of the bottom plate (11) is connected with the right end of the middle plate (12) through a right support plate (14), the middle of the bottom plate (11) is connected with the middle of the middle plate (12) through a middle support plate (15), the left end of the middle plate (12) is connected with the left end of the top plate (13) through a left support plate (16), a left bottom plate convex rib (17) is connected to the left edge of the upper surface of the bottom plate (11), a right bottom plate convex rib (18) is connected to the upper surface of the bottom plate (11) between the right support plate (14) and the middle support plate (15), and a middle plate convex rib (19) is connected to the lower surface of the middle plate (12) between the right support plate (14) and the middle support plate (15);
in the direction from left to right, the left section of the middle plate (12) is arranged in a manner of gradually increasing the thickness, the left section of the top plate (13) is arranged in a manner of gradually reducing the thickness, and the right section of the top plate (13) is arranged in a manner of gradually reducing the thickness;
the right support plate (14), the middle support plate (15), the bottom plate (11) and the middle plate (12) are combined to form an angle code cavity (23), and the connecting angle code is installed in the angle code cavity (23); a clamp pressing cavity (24) is formed by combining a left bottom plate rib (17), a bottom plate (11), a middle support plate (15) and a middle plate (12);
the pressing clamp (3) comprises a clamp base plate (31), a first locking rib (32) and a second locking rib (33); the clamp base plate (31) is a long strip-shaped plate body, a first locking convex rib (32) is integrally connected with the left side edge and the right side edge of the lower surface of the clamp base plate (31), a left second locking convex rib (33) and a right second locking convex rib (33) are integrally connected with the lower surface of the clamp base plate (31) between the two first locking convex ribs (32), the length directions of the clamp base plate (31), the first locking convex ribs (32) and the second locking convex ribs (33) are the same, a round corner transition is formed between the left side wall and the lower surface of the first locking convex rib (32), a round corner transition is formed between the left side wall and the lower surface of the second locking convex rib (33), the heights of the two first locking convex ribs (32) are equal, the heights of the two second locking convex ribs (33) are equal, the height of the first locking convex rib (32) is smaller than the height of the second locking convex rib (33), the width of the first locking convex rib (32, a locking hole (34) is formed in the clamp base plate (31) between the left second locking convex rib and the right second locking convex rib (33);
in the anchor clamps pressure chamber (24) of frame section bar were gone into to first locking bead (32) card, second locking bead (33) supported the lateral wall of frame section bar, and through locking hole (34) internal rotation locking bolt (6) will compress tightly anchor clamps (3) and fix at whole support frame (5), compress tightly anchor clamps (3) will subassembly frame (1) compress tightly on whole support frame (5).
2. The crystalline silicon solar dual-glass assembly connecting structure as defined in claim 1, wherein: the upper surface of the left section of the middle plate (12) is provided with a middle plate inclined plane (20) which is higher at the left and lower at the right, so that the left section of the middle plate (12) is arranged with the thickness gradually increasing from the left to the right.
3. The crystalline silicon solar dual-glass assembly connecting structure as defined in claim 1, wherein: the lower surface of the left section of the top plate (13) is provided with a top plate lower inclined surface (21) which is low at the left and high at the right, so that the left section of the top plate (13) is arranged in a thickness reducing mode in the direction from left to right.
4. The crystalline silicon solar dual-glass assembly connecting structure as defined in claim 1, wherein: the upper surface of the right section of the top plate (13) is provided with a top plate upper inclined plane (22) which is high at the left and low at the right, so that the right section of the top plate (13) is arranged in a thickness reducing mode in the direction from left to right.
5. The crystalline silicon solar dual-glass assembly connecting structure as defined in claim 1, wherein: the left end parts of the bottom plate (11) and the middle plate (12) are aligned with the left end part of the top plate (13), the right end part of the middle plate (12) extends out of the right support plate (14) rightwards for a certain distance, and the right end part of the top plate (13) is located on a convex rib (19) of the middle plate.
6. The crystalline silicon solar dual-glass assembly connecting structure as defined in claim 1, wherein: the left and right first locking convex ribs (32) are arranged along the left and right symmetrical center line of the clamp base plate (31) in a left and right symmetrical mode.
7. The crystalline silicon solar dual-glass assembly connecting structure as defined in claim 1, wherein: the left and right second locking convex ribs (33) are arranged along the left and right symmetrical center line of the clamp base plate (31) in a left and right symmetrical mode.
8. The crystalline silicon solar dual-glass assembly connecting structure as defined in claim 1, wherein: the upper surface of the clamp base plate (31) at the position corresponding to the first locking rib (32) at the left side and the second locking rib (33) at the left side is provided with a first inclined surface (35) which is low at the left side and high at the right side; the upper surface of the clamp base plate (31) at the position corresponding to the first locking rib (32) at the right side and the second locking rib (33) at the right side is provided with a first inclined surface (35) which is higher at the left side and lower at the right side.
9. The crystalline silicon solar dual-glass assembly connection structure of claim 8, wherein: the included angle formed by the first inclined surface (35) and the upper surface of the clamp substrate (31) is 10-20 degrees.
CN201911190725.0A 2019-11-28 2019-11-28 Connection structure of crystalline silicon solar dual-glass assembly Pending CN110868150A (en)

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Application Number Priority Date Filing Date Title
CN201911190725.0A CN110868150A (en) 2019-11-28 2019-11-28 Connection structure of crystalline silicon solar dual-glass assembly

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201911190725.0A CN110868150A (en) 2019-11-28 2019-11-28 Connection structure of crystalline silicon solar dual-glass assembly

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CN110868150A true CN110868150A (en) 2020-03-06

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Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20140083504A1 (en) * 2012-09-26 2014-03-27 Au Optronics Corporation Solar apparatus and mounting system thereof
CN204559470U (en) * 2015-04-15 2015-08-12 宁波大智机械科技有限公司 A kind of solar panels installation module
CN205283483U (en) * 2015-12-04 2016-06-01 海润光伏科技股份有限公司 Dual glass assembly aluminium frame
CN206575355U (en) * 2016-12-29 2017-10-20 青岛瑞元鼎泰新能源科技有限公司 A kind of solar double-glass assemblies installed suitable for flexible support
EP3319228A1 (en) * 2016-11-08 2018-05-09 Solarstone OÜ An integrated solar panel to a tiled roof
CN108599700A (en) * 2018-04-27 2018-09-28 浙江宝利特新能源股份有限公司 A kind of briquetting using Yan Bianshi proximate matters hides photovoltaic system installation method
CN208241605U (en) * 2018-06-05 2018-12-14 苏州阿特斯阳光电力科技有限公司 Double glass photovoltaic modulies
CN109713994A (en) * 2018-12-13 2019-05-03 东莞恒阳新能源科技有限公司 A kind of solar double-glass assemblies waterproof installation fixed structure

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20140083504A1 (en) * 2012-09-26 2014-03-27 Au Optronics Corporation Solar apparatus and mounting system thereof
CN204559470U (en) * 2015-04-15 2015-08-12 宁波大智机械科技有限公司 A kind of solar panels installation module
CN205283483U (en) * 2015-12-04 2016-06-01 海润光伏科技股份有限公司 Dual glass assembly aluminium frame
EP3319228A1 (en) * 2016-11-08 2018-05-09 Solarstone OÜ An integrated solar panel to a tiled roof
CN206575355U (en) * 2016-12-29 2017-10-20 青岛瑞元鼎泰新能源科技有限公司 A kind of solar double-glass assemblies installed suitable for flexible support
CN108599700A (en) * 2018-04-27 2018-09-28 浙江宝利特新能源股份有限公司 A kind of briquetting using Yan Bianshi proximate matters hides photovoltaic system installation method
CN208241605U (en) * 2018-06-05 2018-12-14 苏州阿特斯阳光电力科技有限公司 Double glass photovoltaic modulies
CN109713994A (en) * 2018-12-13 2019-05-03 东莞恒阳新能源科技有限公司 A kind of solar double-glass assemblies waterproof installation fixed structure

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Application publication date: 20200306