Highly waterproof photovoltaic junction box and assembly thereof

Abstract

The highly waterproof photovoltaic junction box comprises a box body and a box cover, the box body and the box cover are connected with each other in a matched manner and form an accommodating cavity, and the accommodating cavity is configured to accommodate electrical elements; the box cover comprises a box cover body and an extension part, and the extension part is arranged at the bottom of the box cover body and extends in the direction close to the box body; an extending portion is arranged on the outer side of the box body, a sealing ring is arranged on the outer side of the extending portion, the extending portion and the sealing ring are of an integrated structure, the two ends of the inner wall of the box body are in an arc shape, the shape of the outer wall of the extending portion is matched with that of the inner wall of the box body, and when the box body and the box cover are matched with each other, the sealing ring is arranged. And the extension part extends into the box body and is in sealed connection with the box body through the sealing ring. The photovoltaic junction box provided by the utility model has good sealing performance.

Description

Technical Field

[0001] The utility model relates to the technical field of solar photovoltaic, in particular to a highly waterproof photovoltaic junction box and its components. Background Art

[0002] A photovoltaic junction box is a component specifically designed for a solar photovoltaic power generation system, which plays a key role in connecting and protecting electrical components. The photovoltaic junction box is responsible for transmitting the electric energy generated by the solar cell module to other parts of the system, such as an inverter or a storage battery, so as to ensure that the current can be effectively led out from the photovoltaic array and put into use. The photovoltaic junction box needs to have good sealing and insulation properties to protect the internal circuit from the influence of external environmental factors such as rain, dust, and extreme temperatures.

[0003] For a photovoltaic junction box with high requirements for sealing performance, such as an offshore photovoltaic junction box designed for an offshore photovoltaic power generation system, compared with the junction box used on land, the photovoltaic junction box needs to face a more severe use environment, including challenges such as high salt spray corrosion, high humidity, wind and wave impact, and strong ultraviolet radiation. Therefore, such a junction box needs to have a higher level of sealing and insulation properties during design and manufacturing to ensure that the inside of the junction box is completely sealed, prevent moisture penetration, adapt to the high humidity environment at sea, and ensure electrical safety.

[0004] The disclosure of the above background art content is only for assisting in understanding the concept and technical solution of the present utility model, and it does not necessarily belong to the prior art of this application, nor will it necessarily give technical guidance; in the case where there is no clear evidence indicating that the above content was publicly available before the filing date of this application, the above background art should not be used to evaluate the novelty and inventiveness of this application. Summary of the Utility Model

[0005] The purpose of the present utility model is to provide a highly waterproof photovoltaic junction box and its components, which have good sealing performance.

[0006] To achieve the above purpose, the technical solution adopted by the present utility model is as follows:

[0007] A highly waterproof photovoltaic junction box includes a box body and a box cover. The box body and the box cover are cooperatively connected to form a receiving cavity, and the receiving cavity is configured to receive electrical components;

[0008] The box cover includes a box cover body and an extension portion. The extension portion is provided at the bottom of the box cover body and extends towards the box body;

[0009] A sealing ring is provided on the outer side of the extension part. The extension part and the sealing ring are of an integral structure. The two ends of the inner wall of the box body are arc-shaped. The outer wall shape of the extension part matches the shape of the inner wall of the box body. When the box body and the box cover cooperate with each other, the extension part extends into the interior of the box body and is hermetically connected to the box body through the sealing ring.

[0010] Further, based on any one of the foregoing technical solutions or a combination of multiple technical solutions, the two ends of the box body are of a semi-circular structure, and the two ends of the box cover body and the extension part are both semi-circular structures corresponding to the two ends of the box body;

[0011] Further, based on any one of the foregoing technical solutions or a combination of multiple technical solutions, a plurality of grooves are provided on the outer wall surface of the extension part, and a part of the sealing ring is arranged in the grooves;

[0012] Further, based on any one of the foregoing technical solutions or a combination of multiple technical solutions, one end of the groove communicates with the lower end of the extension part; and / or,

[0013] the extending direction of the groove is the same as the extending direction of the extension part; and / or,

[0014] the length of the groove is the same as the extending length of the extension part; and / or,

[0015] a plurality of the grooves are equidistantly distributed along the periphery of the extension part; and / or,

[0016] a plurality of the grooves are symmetrically distributed front and back along the periphery of the extension part; and / or,

[0017] a plurality of the grooves are symmetrically distributed left and right along the periphery of the extension part.

[0018] Further, based on any one of the foregoing technical solutions or a combination of multiple technical solutions, the groove includes a first groove part and a second groove part arranged along the outer wall surface of the extension part;

[0019] The first groove part is arranged along the extending direction of the extension part, and the second groove part forms a certain angle with the first groove part.

[0020] A plurality of convex ribs extending along the circumferential direction are provided on the outer wall surface of the sealing ring.

[0021] Further, based on any one of the foregoing technical solutions or a combination of multiple technical solutions, the middle part of the extension part includes a hollow part, and a plurality of reinforcing ribs are arranged in the hollow part; and / or,

[0022] A plurality of convex ribs extending along the circumferential direction are provided on the outer wall surface of the sealing ring.

[0023] Further, based on any one of the foregoing technical solutions or a combination of multiple technical solutions, the box body and the box cover are connected by a snap structure;

[0024] The snap structure includes a corresponding claw and a slot. The claw and the slot are two components, one of which is disposed on the box body and the other is disposed on the box cover;

[0025] The claw is configured to be clamped in the slot.

[0026] Further, based on any one of the foregoing technical solutions or a combination of multiple technical solutions, the claw is a convex structure disposed on the box cover body;

[0027] The slot is disposed on the side wall of the box body. The slot is a groove structure, and one end of the groove structure is connected to the accommodating cavity in a communicating manner.

[0028] Further, based on any one of the foregoing technical solutions or a combination of multiple technical solutions, a guiding portion is provided at the upper end of the slot. The guiding portion includes a guiding surface that slopes downward in a direction from the outside to the inside of the side wall.

[0029] Further, based on any one of the foregoing technical solutions or a combination of multiple technical solutions, one or more convex portions are provided on the top of the box cover, and the convex portions extend to the outside of the side wall of the box body;

[0030] An accommodating groove is provided at the upper end of the side wall of the box body. The accommodating groove corresponds to the convex portion one by one, and the accommodating groove is configured to accommodate a part of the convex portion.

[0031] According to another aspect of the present invention, a highly waterproof photovoltaic junction box assembly is provided, including at least two photovoltaic junction boxes as described in any one of the foregoing technical solutions or a combination of multiple technical solutions; the plurality of photovoltaic junction boxes are mechanically connected and / or electrically connected.

[0032] The beneficial effects brought by the technical solutions provided by the present invention are as follows:

[0033] a. By integrating the extension portion of the box cover and the sealing ring on the extension portion into an integral structure, and setting the two ends of the extension portion and the inner wall of the box body to be arc-shaped, the present invention can prevent water vapor from entering the box body through the connection portion between the sealing ring and the box cover, thereby improving the sealing performance of the junction box;

[0034] b. By providing a plurality of grooves on the outer wall of the extension portion, during the molding process of the sealing ring, the material used for injection molding the sealing ring flows into the grooves, which can increase the firmness of the connection between the sealing ring and the box cover and also improve the sealing performance of the connection between the box cover and the box body;

[0035] c. The utility model is provided with one or more convex parts on the top of the box cover, and the convex parts extend to the outside of the side wall of the box body. Correspondingly, a receiving groove for receiving part of the convex parts is provided on the side wall of the box body, so that the box cover can be conveniently pried open by a tool without affecting the fitting connection between the box cover and the box body and without increasing its volume. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments recorded in the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0037] Figure 1 An exploded schematic view of a photovoltaic junction box provided for an exemplary embodiment of the present utility model;

[0038] Figure 2 A three-dimensional schematic view of the box cover of a photovoltaic junction box provided for an exemplary embodiment of the present utility model;

[0039] Figure 3 A top view schematic view of the box body of a photovoltaic junction box provided for an exemplary embodiment of the present utility model;

[0040] Figure 4 For Figure 3 The cross-sectional schematic view shown in the A-A direction in

[0041] Figure 5 A top view schematic view of a photovoltaic junction box assembly provided for an exemplary embodiment of the present utility model;

[0042] Figure 6 A three-dimensional schematic view of a photovoltaic junction box assembly provided for an exemplary embodiment of the present utility model.

[0043] Among them, the reference numerals include: 1-box body, 11-bottom wall, 111-supporting platform, 112-positioning column, 113-glue leakage hole, 114-perforation for the first bus bar, 12-side wall, 121-wire passing hole, 122-wire passing end, 123-clamping platform, 13-card slot, 131-guiding part, 14-receiving groove, 2-box cover, 21-box cover body, 22-extension part, 221-groove, 222-reinforcing rib, 23-claw, 24-convex part, 3-receiving cavity, 4-sealing ring, 41-convex rib, 5-electrical component, 51-perforation for the second bus bar, 6-cable, 71-nut, 72-plug, 73-inner claw. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0044] To enable those skilled in the art to better understand the solution of the present utility model, the following will clearly and completely describe the technical solution in the embodiments of the present utility model with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0045] It should be noted that the terms "first", "second", etc. in the description and claims of the present utility model and the above-mentioned accompanying drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that such used data can be interchanged under appropriate circumstances so that the embodiments of the present utility model described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, device, product or equipment comprising a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products or equipment.

[0046] In an embodiment of the present utility model, a highly waterproof photovoltaic junction box is provided. Refer to Figures 1 to 4 , the photovoltaic junction box includes a box body 1 and a box cover 2. The box body 1 and the box cover 2 are connected in cooperation with each other and form a receiving cavity 3, and the receiving cavity 3 is configured to receive electrical components 5;

[0047] The box cover 2 includes a box cover body 21 and an extension portion 22. The extension portion 22 is provided at the bottom of the box cover body 21 and extends in a direction close to the box body 1;

[0048] A sealing ring 4 is provided on the outer side of the extension portion 22. The sealing ring 4 and the extension portion 22 are of an integral structure. In actual production, an integral box cover and sealing ring can be prepared by a two-color injection molding process. The two ends of the inner wall of the box body 1 are arc-shaped, and the outer wall shape of the extension portion 22 matches the shape of the inner wall of the box body 1. When the box body 1 and the box cover 2 are connected in cooperation, the extension portion 22 extends into the box body 1 and is hermetically connected to the box body 1 through the sealing ring 4.

[0049] By integrating the extension part of the box cover and the sealing ring on the extension part, the present utility model can prevent water vapor from entering the box body through the connection part between the sealing ring and the box cover, thereby improving the sealing performance of the photovoltaic junction box; and by setting the two ends of the extension part and the inner wall of the box body to be arc-shaped, preferably semi-circular structures, the sealing performance of the connection between the sealing ring and the box body can be further improved, and thus the sealing performance of the photovoltaic junction box is improved.

[0050] Preferably, a plurality of grooves 221 are provided on the outer wall surface of the extension part 22, and the grooves 221 are configured to accommodate the injection molding material of the sealing ring 4, that is, a part of the sealing ring 4 is arranged in the grooves 221. More preferably, one end of the groove 221 communicates with the lower end of the extension part 22, and this structure is easy to mold and facilitates air exhaust during the injection molding process.

[0051] By providing a plurality of grooves on the outer wall of the extension part in the present utility model, during the forming process of the sealing ring, the material used for injection molding the sealing ring flows into the grooves, which can increase the firmness of the connection between the sealing ring and the box cover, and also improve the sealing performance of the connection between the box cover and the box body. Among them, there are various ways to set the grooves 221. One setting method is as Figure 2 shown, the extending direction of the groove 221 is the same as the extending direction of the extension part 22, and the length of the groove 221 is the same as the extending length of the extension part 22. In addition, a plurality of the grooves 221 are symmetrically distributed front and back and left and right along the periphery of the extension part 22. More preferably, a plurality of the grooves 221 are also equidistantly distributed along the periphery of the extension part 22.

[0052] Another setting method of the groove 221 is different from that Figure 2 shown. In this setting method, the groove 221 includes a first groove part and a second groove part arranged along the outer wall surface of the extension part 22, and the first groove part and the second groove part are connected in communication. In addition, the first groove part is arranged along the extending direction of the extension part 22, and the second groove part forms a certain angle with the first groove part. That is, the groove 221 includes two bent parts, and its lower end (the end close to the box body) is as Figure 2 shown, the same as the extending direction of the extension part, and its upper end extends along the circumferential direction of the outer wall of the extension part 22, so that the extending length of the groove 221 and the amount of the injection molding material of the sealing ring flowing into it can be increased, further improving the firmness of the connection between the sealing ring and the box cover and the sealing performance of the connection between the box cover and the box body.

[0053] For the above-mentioned groove 221, its cross-section can adopt a rectangular structure with one side open, or other shaped structures. More preferably, the cross-section of the groove 221 is as Figure 2 shown, and it has a contraction structure in the direction of extending towards the outer wall of the extension part.

[0054] like Figure 1 system Figure 3 As shown, in this embodiment, the two ends of the inner wall of the box body 1 are in an arc shape, and the outer wall shape of the extension portion 22 matches the shape of the inner wall of the box body 1. Preferably, the two ends of the box body 1 (including the inner wall and the outer wall) are semicircular structures, and the two ends of the box cover body 21 and the extension portion 22 of the box cover 2 are also semicircular structures corresponding to the two ends of the box body 1. This structure makes the connection between the sealing ring 4 and the box body 1 and the box cover 2 tighter.

[0055] Preferably, if Figure 1 As shown, the outer wall surface of the sealing ring 4 is provided with a plurality of ridges 41 extending in the circumferential direction, so as to achieve a better sealing effect.

[0056] The middle part of the extension part 22 includes a hollow part, and a plurality of reinforcing ribs 222 are arranged in the hollow part. The extension part 22 is preferably as follows Figure 2 The structure shown is an annular structure, in the middle of which are arranged reinforcing ribs intersecting horizontally and vertically, which can take into account both the use of less material, i.e., reducing costs and ensuring structural strength.

[0057] See also Figures 3 to 5 The box body 1 includes a bottom wall 11 and a side wall 12 , and a supporting assembly for supporting the electrical component 5 is arranged on the bottom wall 11 .

[0058] The support assembly includes a plurality of support platforms 111 and a plurality of positioning columns 112 disposed on the bottom wall 11, and the support platforms 111 and the positioning columns 112 extend toward the opening direction of the cavity 4. The electrical component 5 (including a circuit board and electronic components disposed on the circuit board) is disposed on the support platform 111 and is fixed and limited by the positioning columns 112.

[0059] One or more first busbar through-holes 114 are disposed in the middle of the bottom wall 11 . The busbar passes through the first busbar through-holes 114 and then through the second busbar through-holes 51 on the electrical component 5 to be electrically connected to the corresponding electrical component.

[0060] The box body 1 and the box cover 2 are both integrally formed structures made by injection molding, and the box body 1 and the box cover 2 are connected by a buckle structure. The buckle structure includes a one-to-one corresponding claw 23 and a slot 13, and the claw 23 and the slot 13 are two parts, one of which is arranged on the box body 1 and the other is arranged on the box cover 2; the claw 23 is configured to be clamped in the slot 13.

[0061] Preferably, if Figure 1 and Figure 4As shown, the jaw 23 is a raised structure provided on the lid body 21; the card slot 13 is provided on the side wall 12 of the box body 1, and the card slot 13 is a groove structure, and one end of the groove structure is connected to the accommodation cavity 3. As Figure 4 As shown, a guiding portion 131 is provided at the upper end of the card slot 13. The guiding portion 131 includes a guiding surface that slopes downward along the direction from the outside to the inside of the side wall 12, which can facilitate the snap connection between the lid and the box body. After the lid 2 and the box body 1 are snap-connected, the sealing ring 3 closely cooperates with the inner side of the side wall 12 of the box body below the card slot 13.

[0062] One or more raised portions 24 are provided on the top of the lid 2, and the raised portions 24 extend to the outside of the side wall of the box body 1. A plurality of accommodation grooves 14 are provided on the side wall of the box body 1, and the raised portions 24 are snapped into the accommodation grooves 14, which facilitates prying open the lid 2 with a tool without affecting the mating connection between the lid and the box body.

[0063] On the side of the box body 1, a wire-passing end 122 extending outward and a wire-passing hole 121 are further provided. The wire-passing hole 121 passes through the wire-passing end 122 to communicate the inside and outside of the box body 1. The cable 6 passes through the through-hole 121 and is electrically connected to the electrical component 5 inside the box body.

[0064] The outer surface of the wire-passing end 122 is provided with a threaded structure, and a clamping table 123 is provided at the intersection of the wire-passing end 122 and the side wall 12. A nut 71, a plug 72, and an inner claw 73 are sleeved on the cable 6. Among them, the nut 71 is threadedly connected to the wire-passing end 122. The inner claw 73 and the plug 72 are arranged inside the wire-passing end 122, that is, inside the wire-passing hole 121. The outer wall of the plug 72 is in mating connection with the inner wall of the wire-passing end 122, and the inner wall of the plug 72 wraps around the cable 6. The inner claw 73 is clamped between the plug 72 and the nut 71. When the nut 71 is tightened, the connection between the inner claw 73 and the cable 6 will become tighter and tighter until the nut 71 rotates to the clamping table 1224, and the nut 71 cooperates with the clamping table 1224 to complete the fixation of the cable 6 to the box body 1.

[0065] The photovoltaic junction box can be a split-type junction box installed on a solar panel. One or more glue leakage holes 113 are provided on the bottom wall 11 of the box body 1. The inside of the box body 1 is filled with a sealing glue, and the sealing glue fully wraps the electrical component 5 and the part of the cable 6 located inside the box body 1 and in the wire-passing hole 121 through the glue leakage holes 113.

[0066] In an embodiment of the present invention, a highly waterproof photovoltaic junction box assembly is provided, such as Figure 5 and Figure 6As shown in the figure, it includes at least two photovoltaic junction boxes described in any one of the above; a plurality of the photovoltaic junction boxes are mechanically connected and / or electrically connected, which is specifically set according to the usage requirements.

[0067] It should be noted that the above embodiments of the photovoltaic junction box assembly and the embodiments of the photovoltaic junction box are based on the same inventive concept, and all the contents of the embodiments of the photovoltaic junction box are incorporated into the embodiments of the photovoltaic junction box assembly by reference.

[0068] It should be noted that in this text, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising a..." does not exclude the existence of additional identical elements in the process, method, article or device comprising the element.

[0069] The above are only specific embodiments of the present application. It should be pointed out that for those of ordinary skill in the art, without departing from the principle of the present application, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present application.

Claims

1. A highly waterproof photovoltaic junction box, characterized in that, It includes a box body (1) and a box cover (2). The box body (1) and the box cover (2) are cooperatively connected to form an accommodation cavity (3), and the accommodation cavity (3) is configured to accommodate electrical components (5). The box cover (2) includes a box cover body (21) and an extension part (22). The extension part (22) is provided at the bottom of the box cover body (21) and extends in a direction close to the box body (1). A sealing ring (4) is provided on the outer side of the extension part (22). The extension part (22) and the sealing ring (4) are of an integral structure. The two ends of the inner wall of the box body (1) are arc-shaped, and the outer wall shape of the extension part (22) matches the shape of the inner wall of the box body (1). When the box body (1) and the box cover (2) are cooperatively connected, the extension part (22) extends into the box body (1) and is hermetically connected to the box body (1) through the sealing ring (4).

2. The photovoltaic junction box according to claim 1, wherein, Both ends of the box body (1) are semi-circular structures, and both ends of the box cover body (21) and the extension part (22) are semi-circular structures corresponding to the two ends of the box body (1).

3. The photovoltaic junction box according to claim 1, wherein, A plurality of grooves (221) are provided on the outer wall surface of the extension part (22), and a part of the sealing ring (4) is arranged in the grooves (221).

4. The photovoltaic junction box according to claim 3, characterized in that, One end of the groove (221) communicates with the lower end of the extension part (22); and / or The extending direction of the groove (221) is the same as the extending direction of the extension part (22); and / or The length of the groove (221) is the same as the extending length of the extension part (22); and / or A plurality of the grooves (221) are equidistantly distributed around the extension part (22); and / or A plurality of the grooves (221) are symmetrically distributed front and back around the extension part (22); and / or A plurality of the grooves (221) are symmetrically distributed left and right around the extension part (22).

5. The photovoltaic junction box according to claim 1, characterized in that, The middle part of the extension part (22) includes a hollow part, and a plurality of reinforcing ribs (222) are arranged in the hollow part; and / or A plurality of circumferentially extending convex ribs (41) are provided on the outer wall surface of the sealing ring (4).

6. The photovoltaic junction box according to claim 1, characterized in that, The box body (1) and the box cover (2) are connected through a snap structure; The snap structure includes a corresponding claw (23) and a slot (13). The claw (23) and the slot (13) are two components, and one of the components is arranged on the box body (1), and the other component is arranged on the box cover (2); The claw (23) is configured to be clamped in the slot (13).

7. The photovoltaic junction box according to claim 6, wherein, The claw (23) is a raised structure arranged on the box cover body (21); The slot (13) is arranged on the side wall (12) of the box body (1). The slot (13) is a groove structure, and one end of the groove structure communicates with the accommodation cavity (3).

8. The photovoltaic junction box according to claim 7, characterized in that, A guiding part (131) is provided at the upper end of the slot (13), and the guiding part (131) includes a guiding surface that slopes downward in a direction from the outside to the inside of the side wall (12).

9. The photovoltaic junction box according to claim 1, characterized in that, One or more protruding portions (24) are provided on the top of the box cover (2), and the protruding portions (24) extend to the outside of the side wall of the box body (1); A receiving groove (14) is provided at the upper end of the side wall (12) of the box body (1), and the receiving grooves (14) correspond to the protruding portions (24) one by one, and the receiving grooves (14) are configured to receive a part of the protruding portions (24).

10. A highly waterproof photovoltaic junction box assembly, characterized in that, It includes at least two photovoltaic junction boxes according to any one of claims 1-9; and a plurality of the photovoltaic junction boxes are mechanically connected and / or electrically connected.

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