Miniaturized three-split photovoltaic junction box

Abstract

The utility model belongs to the technical field of solar photovoltaic, and particularly relates to a miniaturized three-split photovoltaic junction box, which solves the problems in the prior art that the cost and the glue filling amount cannot be effectively reduced, and the heat dissipation performance is poor, and comprises a left box body, a middle box body and a right box body, the top of the left box body, the top of the middle box body and the top of the right box body are respectively provided with a second box cover, a third box cover and a first box cover, through the arrangement of structures such as buckles and L-shaped reinforcing ribs, a glue overflowing opening is designed in an inner cavity formed by the L-shaped reinforcing ribs, when heat-conducting sealing glue is poured into the photovoltaic junction box installed in an assembly factory, the heat-conducting sealing glue is poured to be flush with the glue overflowing opening, and the heat-conducting sealing glue is poured into the inner cavity. And redundant glue can overflow into the closed cavity from the two openings, so that on one hand, the design can reinforce the box body and reduce the usage amount of the sealant, and on the other hand, the redundant glue can be stored during installation, and the installation complexity can be reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of solar photovoltaics, in particular to a miniaturized three-body photovoltaic junction box. Background Art

[0002] At present, the market access requirements for photovoltaic junction boxes vary according to the laws and regulations of the target market and customer requirements. In actual situations, in order to expand the global market, companies will choose to obtain dual certifications from TUV and UL at the same time to ensure smooth market access for their products in multiple regions. Currently, photovoltaic junction box products that meet dual certifications are often large in size and cannot meet current cost reduction needs. Traditional photovoltaic junction boxes are large in size and require a lot of glue, which not only increases costs but also affects the heat dissipation effect.

[0003] The application publication number in the prior art is: CN213072568U, a three-part photovoltaic junction box, including a left junction box, a middle junction box and a right junction box, the left junction box, the middle junction box and the right junction box all include a box body, a box cover and a modular photovoltaic element installed in the corresponding box body; each modular photovoltaic element includes a first conductive terminal, a diode packaging module and a second conductive terminal, and the end of the first conductive terminal or the second conductive terminal is provided with a cable riveting portion. The three-part photovoltaic junction box of the utility model reduces the volume of the junction box, can reduce its shielding of the photovoltaic module area, and improve the power generation performance of the photovoltaic module; the left, middle and right junction boxes are provided with modular photovoltaic elements of a unified structure, and the modular photovoltaic elements adopt an integrated packaging technology of conductive terminals and diodes to avoid secondary switching, enhance the conductivity of the diode, avoid the configuration of stamping dies with multiple structures during production and manufacturing, and save manufacturing costs. However, the patent cannot effectively reduce costs and reduce the amount of glue filling, and the heat dissipation performance is poor. Utility Model Content

[0004] The purpose of the utility model is to provide a miniaturized three-part photovoltaic junction box, which solves the problems in the prior art that the cost cannot be effectively reduced, the amount of glue filling cannot be reduced, and the heat dissipation performance is poor. This patent can meet the dual international certification standards of TUV and UL, and can effectively reduce costs and improve heat dissipation performance.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a miniaturized three-part photovoltaic junction box, comprising a left box body, a middle box body and a right box body, wherein the tops of the left box body, the middle box body and the right box body are all provided with a box cover 2, a box cover 3 and a box cover 1, and the inner sides of the left box body, the middle box body and the right box body are all provided with a buckle 2, a buckle 3 and a buckle 1, and the buckle 2, the buckle 3 and the buckle 1 are bonded to the inner wall of the box body by glue, and can be connected according to the cable Standard replacement buckle, two symmetrical L-shaped reinforcing ribs 2 are provided on one side of the interior of the left box body, two symmetrical L-shaped reinforcing ribs 1 are provided on the other side of the interior of the right box body, L-shaped reinforcing ribs 3 are provided at the four corners of the interior of the middle box body, and overflow ports 1, 2 and 3 are provided on the tops of L-shaped reinforcing ribs 1, 2 and 3, and long reinforcing ribs 2 and 1 are provided on the inner inner walls of the left box body and the right box body.

[0006] Preferably, the upper edges of the inner walls of the left box body, the middle box body and the right box body are all provided with thinning layer 2, thinning layer 3 and thinning layer 1, and the thinning layer 1, the thinning layer 2 and the thinning layer 3 are in a rectangular ring shape.

[0007] Preferably, the left box body, the middle box body and the right box body are internally fixedly connected with a plurality of anti-foolproof mechanisms 2, anti-foolproof mechanisms 3 and anti-foolproof mechanism 1, and the left box body, the middle box body and the right box body are internally fixedly connected with a plurality of photovoltaic module locking structures 2, photovoltaic module locking structures 3 and photovoltaic module locking structure 1.

[0008] Preferably, the bottoms of the left box body, the middle box body and the right box body are each provided with two through holes 2, through hole 3 and through hole 1, and both sides of through hole 2, through hole 3 and through hole 1 are each provided with recesses 2, recesses 3 and recesses 1.

[0009] Preferably, two bus bar guide channels 2, two bus bar guide channels 3 and one bus bar guide channel 1 are provided at the bottom of the left box body, the middle box body and the right box body.

[0010] Preferably, boss 2, boss 3 and boss 1 are glued to four corners of the bottom of the left box body, the middle box body and the right box body.

[0011] Preferably, direction markings 2, 3 and 1 are provided on one side of the bottom of the left box body, the middle box body and the right box body. The bottom of the left box body is in the shape of an "L", the bottom of the middle box body is in the shape of an "M", and the bottom of the right box body is in the shape of an "R".

[0012] Preferably, photovoltaic cable 1 is installed on one side of the left box body, photovoltaic connector 1 is installed on one side of the photovoltaic cable 1, photovoltaic cable 2 is installed on the other side of the right box body, and photovoltaic connector 2 is installed on the other side of the photovoltaic cable 2.

[0013] Compared with the prior art, the beneficial effects of the utility model are as follows:

[0014] 1. The utility model adopts the arrangement of structures such as snaps and L-shaped reinforcement ribs. The inner cavity composed of the L-shaped reinforcement ribs is designed with a glue overflow port. When the module factory installs the photovoltaic junction box and fills the thermal conductive sealant, it is filled flush with the port, and the excess glue can overflow from the two ports into the closed cavity. This design can reinforce the box body and reduce the use of sealant. It can also store excess glue during installation and reduce the complexity of installation. By arranging the snaps on both sides of the inner wall of the box body, a demoulding space is reserved, so that the box body can be easily demoulded after injection molding, which solves the problem that the previous snaps are located on the upper cover side of the junction box. When the box body is demoulded after injection molding, the corresponding side of the bottom of the snap is required to be empty to complete the demoulding. If the position of the snap is not adjusted, the junction box after miniaturization design cannot reserve a demoulding space.

[0015] 2. The utility model has thinned the upper edge of the inner wall of the box body on the basis of accurate measurement of the creepage distance and on the basis of meeting the creepage distance requirements of UL / TUV certification. This is conducive to reducing the consumption of raw materials for the junction box, increasing the design of through holes and recesses, and improving the flow channel of the sealant, so that the sealant can have more complete contact with the component modules in the junction box to improve heat dissipation. When the thickness of the insulation layer of the TUV / UL dual-certified cable exceeds that of the TUV single-certified cable, the utility model can manually replace the buckle and is compatible with single / dual-certified cables without the need for other design changes, thereby improving the convenience of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0017] Figure 2 This is a schematic diagram of the internal structure of the right box body of the utility model;

[0018] Figure 3 This is a bottom view of the structure of the right box body of the utility model;

[0019] Figure 4 This is a schematic diagram of the internal structure of the middle box body of the utility model;

[0020] Figure 5 This is a bottom view of the structure of the middle box body of the utility model;

[0021] Figure 6 This is a schematic diagram of the internal structure of the left box body of the utility model;

[0022] Figure 7 It is a bottom structural schematic diagram of the left box body of the utility model.

[0023] In the figure: 1. Photovoltaic connector 1; 2. Photovoltaic cable 1; 3. Left box body; 301. Buckle 2; 302. Glue overflow port 2; 303. L-shaped reinforcement rib 2; 304. Long reinforcement rib 2; 305. Anti-fool mechanism 2; 306. Photovoltaic module locking structure 2; 307. Direction mark 2; 308. Through hole 2; 309. Boss 2; 310. Busbar guide channel 2; 311. Box cover 2; 312. Thinning layer 2; 4. Middle box body; 401. Buckle 3; 402. Glue overflow port 3; 403. L-shaped reinforcement rib 3; 405. Anti-fool mechanism 3; 406. Photovoltaic module locking structure 3 ; 407, direction mark three; 408, through hole three; 409, boss three; 410, bus bar guide channel three; 411, box cover three; 412, thinning layer three; 5, right box body; 501, buckle one; 502, glue overflow port one; 503, L-shaped reinforcement rib one; 504, long reinforcement rib one; 505, fool-proof mechanism one; 506, photovoltaic module locking structure one; 507, direction mark one; 508, through hole one; 509, boss one; 510, bus bar guide channel one; 511, box cover one; 512, thinning layer one; 100, photovoltaic connector two; 200, photovoltaic cable two. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0025] See also Figure 1-7A miniaturized three-part photovoltaic junction box comprises a left box body 3, a middle box body 4 and a right box body 5. The tops of the left box body 3, the middle box body 4 and the right box body 5 are all provided with a second box cover 311, a third box cover 411 and a first box cover 511. The inner sides of the left box body 3, the middle box body 4 and the right box body 5 are all provided with a second buckle 301, a third buckle 401 and a first buckle 501. One side of the inner part of the left box body 3 is provided with two symmetrical L-shaped reinforcing ribs 2 303, and the other side of the inner part of the right box body 5 is provided with two symmetrical L-shaped reinforcing ribs 1 503. The inner four corners of the middle box body 4 are all provided with L-shaped reinforcing ribs 3 403, L-shaped reinforcing ribs 1 503 and The tops of the L-shaped reinforcing ribs 2 303 and 3 403 are provided with overflow openings 1 502, 2 302 and 3 402, and the inner walls of the left box body 3 and the right box body 5 are provided with long reinforcing ribs 2 304 and 1 504. An inner cavity composed of a plurality of L-shaped reinforcing ribs is designed. When the component factory installs the photovoltaic junction box and fills the thermal conductive sealant, it is filled until it is flush with this opening, and excess glue can overflow from these two openings into the closed cavity. This design can, on the one hand, reinforce the box body, and on the other hand, reduce the amount of sealant used, and can also store excess glue during installation, thereby reducing the complexity of installation.

[0026] See also Figure 1-7 The upper edges of the inner walls of the left box body 3, the middle box body 4 and the right box body 5 are all provided with thinning layer 2 312, thinning layer 3 412 and thinning layer 1 512. The thinning layer 1 512, thinning layer 2 312 and thinning layer 3 412 are rectangular rings. On the basis of accurate measurement of the creepage distance and on the basis of meeting the creepage distance required by UL / TUV certification, the upper edge of the inner wall of the box body is thinned. The wall thickness of the lower part is 2.5mm, and the upper edge is thinned to 2mm. This design has It is beneficial to reduce the consumption of raw materials of the junction box and to the heat dissipation of the junction box. The left box body 3, the middle box body 4 and the right box body 5 are internally fixedly connected with multiple anti-foolproofing mechanisms 2 305, anti-foolproofing mechanisms 3 405 and anti-foolproofing mechanisms 1 505. The left box body 3, the middle box body 4 and the right box body 5 are internally fixedly connected with multiple photovoltaic module locking structures 2 306, photovoltaic module locking structures 3 406 and photovoltaic module locking structures 1 506. The anti-foolproofing mechanisms and photovoltaic module locking structures play a good anti-foolproofing role.

[0027] See also Figure 1-7, the bottom of the left box body 3, the middle box body 4 and the right box body 5 are all provided with two through holes 2 308, through holes 3 408 and through holes 1 508. The through holes are added to improve the flow channel of the sealant so that the sealant can be in more complete contact with the component modules in the junction box to improve heat dissipation. Both sides of the through holes 2 308, the through holes 3 408 and the through holes 1 508 are provided with recesses 2 313, recesses 3 413 and recesses 1 513. The design of the recesses provides additional flow channels for the sealant on both sides to flow to the bus bar and the bottom of the module. The bottom of the left box body 3, the middle box body 4 and the right box body 5 are all provided with two bus bar guide channels 2 310, bus bar guide channels 3 410 and bus bar guide channels 1 510, which are convenient for welding and reinforcement with the photovoltaic module from here. The four corners of the bottom of the left box body 3, the middle box body 4 and the right box body 5 are The glue is used to stick boss 2 309, boss 3 409 and boss 1 509. When the junction box is stuck on the photovoltaic module with glue, the height of the boss can ensure the flatness and glue amount of the photovoltaic junction box. The design of the annular groove is conducive to more firm sticking. The left box body 3, the middle box body 4 and the right box body 5 are all provided with direction marks 2 307, direction marks 3 407 and direction marks 1 507 on one side of the bottom. The bottom of the left box body 3 is in the shape of an "L", the bottom of the middle box body 4 is in the shape of an "M", and the bottom of the right box body 5 is in the shape of an "R". The main function of this design is to prevent fooling around. A photovoltaic cable 1 2 is installed on one side of the left box body 3, a photovoltaic connector 1 is installed on one side of the photovoltaic cable 2, a photovoltaic cable 2 200 is installed on the other side of the right box body 5, and a photovoltaic connector 2 100 is installed on the other side of the photovoltaic cable 200.

[0028] The specific implementation process of the utility model is as follows: correctly assemble the left box body 3, the middle box body 4 and the right box body 5 together according to the direction marked on the bottom, ensure that "L" corresponds to the left box body 3, "M" corresponds to the middle box body 4, and "R" corresponds to the right box body 5, connect the photovoltaic cables to the left box body 3 and the right box body 5 respectively, and ensure that the photovoltaic connector is firmly installed, use glue to stick the bosses at the four corners of the bottom of the junction box on the photovoltaic module, ensure that the flatness and amount of glue of the junction box are appropriate, and the annular groove design will enhance the firmness of the sticking, and use the anti-fool mechanism fixed inside the box body and the photovoltaic module locking structure to firmly install the photovoltaic module inside the junction box;

[0029] Furthermore, when installing the photovoltaic junction box, it is necessary to pour thermal conductive sealant. When pouring, the glue should be poured to be flush with the overflow port on the L-shaped reinforcement rib. Excess glue will overflow from the overflow port into the closed cavity, which not only strengthens the box body but also reduces the amount of sealant. The through-hole design at the bottom of the junction box improves the flow channel of the sealant, so that the sealant can be more fully in contact with the component module in the junction box, thereby improving the heat dissipation effect. Through the busbar guide channel opened at the bottom, it can be conveniently welded and reinforced with the photovoltaic module to ensure the stability of the connection;

[0030] In addition, when the photovoltaic junction box leaves the factory, it needs to be pre-installed with photovoltaic cables and photovoltaic connectors. The insulation layer thickness of UL-certified photovoltaic cables is relatively thick and the cables are relatively thick. When the whole set of photovoltaic junction box products is to meet UL certification requirements, it is necessary to replace them with UL-certified cables. The photovoltaic junction box designed by the present invention only needs to replace the clips at the arrows, that is, replace them with 6.4-specification clips. There is no need to make any changes to the junction box itself, which easily realizes the compatibility of the whole set of products with TUV and UL dual certifications.

[0031] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A miniaturized three-part photovoltaic junction box, comprising a left box body (3), a middle box body (4) and a right box body (5), characterized in that: The tops of the left box body (3), the middle box body (4) and the right box body (5) are all provided with a second box cover (311), a third box cover (411) and a first box cover (511); the inner sides of the left box body (3), the middle box body (4) and the right box body (5) are all provided with a second buckle (301), a third buckle (401) and a first buckle (501); one side of the inner side of the left box body (3) is provided with two symmetrical L-shaped reinforcing ribs (303); the other side of the inner side of the right box body (5) is provided with two Symmetrical L-shaped reinforcing ribs 1 (503), L-shaped reinforcing ribs 3 (403) are arranged at the four corners inside the middle box body (4), the tops of the L-shaped reinforcing ribs 1 (503), the L-shaped reinforcing ribs 2 (303) and the L-shaped reinforcing ribs 3 (403) are all provided with overflow openings 1 (502), overflow openings 2 (302) and overflow openings 3 (402), and the inner walls of the left box body (3) and the right box body (5) are both provided with long reinforcing ribs 2 (304) and long reinforcing ribs 1 (504).

2. A miniaturized three-part photovoltaic junction box according to claim 1, characterized in that: The upper edges of the inner walls of the left box body (3), the middle box body (4) and the right box body (5) are all provided with a second thinning layer (312), a third thinning layer (412) and a first thinning layer (512); the first thinning layer (512), the second thinning layer (312) and the third thinning layer (412) are in the shape of a rectangular ring.

3. A miniaturized three-part photovoltaic junction box according to claim 2, characterized in that: The left box body (3), the middle box body (4) and the right box body (5) are internally fixedly connected with a plurality of anti-foolproof mechanisms 2 (305), anti-foolproof mechanisms 3 (405) and anti-foolproof mechanisms 1 (505); the left box body (3), the middle box body (4) and the right box body (5) are internally fixedly connected with a plurality of photovoltaic module locking structures 2 (306), photovoltaic module locking structures 3 (406) and photovoltaic module locking structure 1 (506).

4. The miniaturized three-part photovoltaic junction box according to claim 3 is characterized by: The bottoms of the left box body (3), the middle box body (4) and the right box body (5) are each provided with two through holes 2 (308), a through hole 3 (408) and a through hole 1 (508), and both sides of the through holes 2 (308), the through holes 3 (408) and the through holes 1 (508) are each provided with a concave platform 2 (313), a concave platform 3 (413) and a concave platform 1 (513).

5. The miniaturized three-part photovoltaic junction box according to claim 4 is characterized in that: The bottoms of the left box body (3), the middle box body (4) and the right box body (5) are each provided with two bus bar guide channels 2 (310), a bus bar guide channel 3 (410) and a bus bar guide channel 1 (510).

6. The miniaturized three-part photovoltaic junction box according to claim 5, characterized in that: The four corners of the bottom of the left box body (3), the middle box body (4) and the right box body (5) are all glued with a second boss (309), a third boss (409) and a first boss (509).

7. The miniaturized three-part photovoltaic junction box according to claim 6, characterized in that: A second direction mark (307), a third direction mark (407) and a first direction mark (507) are arranged on one side of the bottom of the left box body (3), the middle box body (4) and the right box body (5); the bottom of the left box body (3) is in the shape of an "L" shape, the bottom of the middle box body (4) is in the shape of an "M" shape, and the bottom of the right box body (5) is in the shape of an "R" shape.

8. The miniaturized three-part photovoltaic junction box according to claim 7, characterized in that: Photovoltaic cable one (2) is installed on one side of the left box body (3), photovoltaic connector one (1) is installed on one side of the photovoltaic cable one (2), photovoltaic cable two (200) is installed on the other side of the right box body (5), photovoltaic connector two (100) is installed on the other side of the photovoltaic cable two (200).

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