Reverse polarity protection structure of photovoltaic module junction box

Abstract

This utility model relates to the field of photovoltaic technology, specifically to a reverse connection protection structure for a photovoltaic module junction box. The structure includes a box body, an inner cavity connected to a reverse connection protection circuit, and through holes on the surface of the box body matching the cable. A top cover is connected to the top of the box body via a mounting structure. This design allows the operator to move a threaded cover on the cable surface to align with a threaded ring when connecting positive and negative cables to the reverse connection protection circuit. After alignment, rotating a threaded pin moves a fixing clamp downwards to secure the cable. Rotating the threaded cover connects it to the threaded ring. If the cable's polarity differs from the reverse connection protection circuit's polarity, the positioning block cannot enter the positioning groove. If the cable's polarity is the same, the positioning block enters the positioning groove, thus distinguishing the positive and negative terminals of the cable and providing reverse connection protection.

Description

Technical Field

[0001] This utility model relates to the field of photovoltaic technology, specifically to a reverse connection protection structure for photovoltaic module junction boxes. Background Technology

[0002] A photovoltaic module junction box is a connection device between a solar cell array composed of solar cell modules and a solar charging control device. The main function of the photovoltaic module junction box is to connect and protect the solar photovoltaic modules, connect the power generated by the solar cells to external lines, and conduct the current generated by the photovoltaic modules.

[0003] Currently, most photovoltaic module junction boxes are connected to the internal circuitry via two cables (positive and negative) using copper wires. However, during the connection process, it is easy for the positive and negative terminals to be reversed. When the module is connected in reverse, a reverse voltage is applied, causing the bypass diode to conduct continuously during use, resulting in the diode burning out. This can lead to equipment failure and damage, and may even cause a DC arc fire, posing certain safety hazards and hindering widespread use. Therefore, improvements are needed to address this issue. Utility Model Content

[0004] The purpose of this invention is to provide a reverse connection protection structure for photovoltaic module junction boxes, so as to solve the problem mentioned in the background art that existing junction boxes do not have reverse connection protection for cables.

[0005] To achieve the above objectives, this utility model provides the following technical solution, including a box body, the inner cavity of which is connected to a reverse connection protection circuit, a through hole matching the cable on the surface of the box body, a top cover connected to the top of the box body via an installation structure, threaded rings fixedly connected to both sides of the front side of the box body, threaded covers threadedly connected to the surface of the threaded rings, threaded pins threadedly connected to the outer wall of the threaded covers, the bottom of the threaded pins extending into the inner cavity of the threaded covers and movably connected to a fixing clip, the bottom of the fixing clip tightly fitting the cable, and a pointing rod fixedly connected to the fixing clip and the two opposite sides of the threaded covers, positive and negative symbols provided on both sides of the front side of the box body, three positioning grooves on the front side of the threaded rings, the three positioning grooves being annular, the annular positioning grooves on the two threaded rings being staggered in the circumferential position, a positioning block movably connected to the inner cavity of the positioning groove, and the front side of the positioning block being fixedly connected to the threaded cover.

[0006] Preferably, the mounting structure includes a fixed shell, which is fixedly connected to the box body. A snap-fit ​​component is movably connected to the inner cavity of the fixed shell, and the top of the snap-fit ​​component extends to the outer side of the fixed shell and is fixedly connected to the top cover.

[0007] Preferably, fixing blocks are fixedly connected to both the front and rear sides of the fixed shell, and the fixing blocks are fixedly connected to the box body.

[0008] Preferably, a limiting groove is provided on both sides of the inner cavity of the threaded cover, and a limiting block is movably connected to the inner cavity of the limiting groove. The two limiting blocks are fixedly connected to the fixing clamp.

[0009] Preferably, a sealing ring is fixedly connected to the front side of the threaded cover, and the inner cavity of the sealing ring is tightly fitted with the cable.

[0010] Preferably, the bottom of the inner cavity of the threaded cover and the bottom of the fixing clamp are provided with anti-slip textures, and the two anti-slip textures are in close contact with the cable.

[0011] Compared with the prior art, the beneficial effects of this utility model are:

[0012] This solution allows workers to move the threaded cover on the surface of the cable to align with the threaded ring when connecting the positive and negative cables to the reverse connection protection circuit. After alignment, rotating the threaded pin causes the fixing clamp to move downwards, securing the cable. Rotating the threaded cover connects the cable to the threaded ring. If the positive and negative terminals of the cable and the reverse connection protection circuit are different, the positioning block cannot enter the positioning groove. If the positive and negative terminals of the cable and the reverse connection protection circuit are the same, the positioning block enters the positioning groove, thus distinguishing the positive and negative terminals of the cable and providing reverse connection protection. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of this utility model;

[0014] Figure 2 This is a partial structural cross-sectional view of the present invention;

[0015] Figure 3 This is a split view of the single structure of this utility model;

[0016] Figure 4 This is a diagram showing the use of a single structure of this utility model.

[0017] In the diagram: 1. Box body; 2. Top cover; 3. Threaded ring; 4. Threaded cover; 5. Threaded nail; 6. Fixing clip; 7. Pointer rod; 8. Positive and negative symbols; 9. Positioning groove; 10. Positioning block; 11. Fixing shell; 12. Snap-fit ​​component; 13. Fixing block; 14. Limiting block; 15. Sealing ring; 16. Anti-slip texture. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0019] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0020] Example 1:

[0021] Please see Figure 1-4 This utility model provides a technical solution: a reverse connection protection structure for a photovoltaic module junction box, including a box body 1. The inner cavity of the box body 1 is connected to a reverse connection protection circuit. The surface of the box body 1 has through holes that match the cables. The top of the box body 1 is connected to a top cover 2 via an installation structure. Threaded rings 3 are fixedly connected to both sides of the front side of the box body 1. Threaded covers 4 are threadedly connected to the surface of the threaded rings 3. Threaded nails 5 are threadedly connected to the outer wall of the threaded covers 4. The bottom of the threaded nails 5 extends into the inner cavity of the threaded covers 4 and is movable. A fixing clip 6 is movably connected, and the bottom of the fixing clip 6 is tightly fitted to the cable. The fixing clip 6 and the two threaded covers 4 are fixedly connected to the opposite sides of each other. Positive and negative symbols 8 are provided on both sides of the front side of the box body 1. Three positioning grooves 9 are provided on the front side of the threaded ring 3. The three positioning grooves 9 are in a ring shape. The ring-shaped positioning grooves 9 on the two threaded rings 3 are staggered in the circumferential position. A positioning block 10 is movably connected to the inner cavity of the positioning groove 9. The front side of the positioning block 10 is fixedly connected to the threaded cover 4.

[0022] Analysis of the above: When workers need to connect the positive and negative cables to the reverse connection protection circuit (Note: The photovoltaic module junction box itself forms a reverse connection protection circuit through diode connections, specifically utilizing the unidirectional conductivity of diodes; the diode conducts when connected in the forward direction and is cut off when connected in the reverse direction. This is the existing structure and will not be elaborated further in this document), the workers first move the cables through the through-hole on box 1 to measure the connection distance with the reverse connection protection circuit. After measurement, the workers move the threaded cover 4 on the surface of the cable to align it with the threaded ring 3. After alignment, the workers rotate the threaded pin 5, which moves the fixing clamp 6 downwards. When it reaches the designated position, the connection is complete. The cable is secured in the threaded cover 4, and then the threaded cover 4 is rotated to connect with the threaded ring 3. At the same time, the threaded cover 4 drives the three annular positioning blocks 10 to rotate and move. If the positive and negative terminals of the cable are different from those of the reverse connection protection circuit, the positioning blocks 10 cannot enter the positioning groove 9, making it impossible to install. If the positive and negative terminals of the cable are the same as those of the reverse connection protection circuit, the positioning blocks 10 enter the positioning groove 9 along the slope during rotation and move, making it fixed in place. The operator can observe whether the indicator rod 7 points to the corresponding positive and negative symbol 8 to distinguish them, thereby completing the purpose of reverse connection protection for the cable. Then, the operator can electrically connect the cable to the reverse connection protection circuit.

[0023] Example 2:

[0024] Please see Figure 1-4 The present invention provides a technical solution based on Embodiment 1: the installation structure includes a fixed shell 11, the fixed shell 11 is fixedly connected to the box body 1, the inner cavity of the fixed shell 11 is movably connected to a snap-fit ​​member 12, the top of the snap-fit ​​member 12 extends to the outer side of the fixed shell 11 and is fixedly connected to the upper cover 2.

[0025] Analysis of the above content: After the staff has finished inspecting the reverse connection protection circuit inside the box 1, the staff moves the top cover 2. The top cover 2 moves the snap-fit ​​component 12. The snap-fit ​​component 12 is an elastic structure. When the top cover 2 is placed on top of the box 1, the two protrusions at the bottom of the snap-fit ​​component 12 enter the inner cavity of the fixing shell 11 and then lock the connection between the snap-fit ​​component 12 and the fixing shell 11, thus fixing it. If you want to remove it, you only need to move the two protrusions towards the middle to move it upward out of the inner cavity of the fixing shell 11, thereby completing the purpose of quick installation.

[0026] Example 3:

[0027] Please see Figure 1-4 Based on Embodiment 1, this utility model provides a technical solution: the front and rear sides of the fixed shell 11 are fixedly connected with fixed blocks 13, and the fixed blocks 13 are fixedly connected with the box body 1.

[0028] Analysis of the above content: By setting the fixing block 13, the fixing shell 11 is reinforced, so that the connection between the fixing shell 11 and the box body 1 will not be separated due to accidental collision.

[0029] Example 4:

[0030] Please see Figure 1-4 Based on Embodiment 1, this utility model provides a technical solution: both sides of the inner cavity of the threaded cover 4 are provided with limiting grooves, the inner cavity of the limiting grooves is movably connected to limiting blocks 14, and the two limiting blocks 14 are fixedly connected to the fixing clamp 6.

[0031] Analysis of the above content: By setting the limiting block 14 and the limiting groove, the fixing clip 6 is limited, so that the fixing clip 6 will not deviate from the movement trajectory during the movement, and prevent it from becoming unusable due to deviation from the trajectory in subsequent use.

[0032] Example 5:

[0033] Please see Figure 1-4 Based on Embodiment 1, this utility model provides a technical solution: a sealing ring 15 is fixedly connected to the front side of the threaded cover 4, and the inner cavity of the sealing ring 15 is tightly fitted with the cable.

[0034] Analysis of the above content: By setting the sealing ring 15, the outside of the connection between the cable and the threaded cover 4 is sealed to prevent outside air from entering.

[0035] Example 6:

[0036] Please see Figure 1-4 Based on Embodiment 1, this utility model provides a technical solution: the bottom of the inner cavity of the threaded cover 4 and the bottom of the fixing clip 6 are both provided with anti-slip textures 16, and the two anti-slip textures 16 are tightly attached to the cable.

[0037] Analysis of the above content: When the cable is fixed in the threaded cover 4 by the fixing clip 6 through the anti-slip texture 16, the fixing clip 6 and the threaded cover 4 can increase the friction of the cable through the anti-slip texture 16, further preventing it from becoming loose.

[0038] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. It will be apparent to those skilled in the art that this utility model is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or basic characteristics of this utility model. Therefore, the embodiments should be considered exemplary and non-limiting in all respects. The scope of this utility model is defined by the appended claims rather than the foregoing description. Therefore, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this utility model, and no reference numerals in the claims should be construed as limiting the scope of the claims.

[0039] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A reverse connection protection structure for a photovoltaic module junction box, characterized in that, include: The box (1) has an inner cavity connected to a reverse connection protection circuit. A through hole matching the cable is provided on the surface of the box (1). A top cover (2) is connected to the top of the box (1) via an installation structure. Threaded rings (3) are fixedly connected to both sides of the front of the box (1). A threaded cover (4) is threaded onto the surface of the threaded ring (3). A threaded nail (5) is threaded onto the outer wall of the threaded cover (4). The bottom of the threaded nail (5) extends into the inner cavity of the threaded cover (4) and is movably connected to a fixing clip (6). The bottom of the clamp (6) is tightly fitted with the cable. The two threaded covers (4) are fixedly connected to the opposite side with a pointing rod (7). Positive and negative symbols (8) are provided on both sides of the front side of the box (1). The front side of the threaded ring (3) is provided with three positioning grooves (9). The positioning grooves (9) are three and are in a ring shape. The ring-shaped positioning grooves (9) on the two threaded rings (3) are staggered in the circumferential position. The inner cavity of the positioning groove (9) is movably connected to a positioning block (10). The front side of the positioning block (10) is fixedly connected to the threaded cover (4).

2. The reverse connection protection structure for the photovoltaic module junction box according to claim 1, characterized in that: The installation structure includes a fixed shell (11), which is fixedly connected to the box body (1). A snap-fit ​​member (12) is movably connected to the inner cavity of the fixed shell (11). The top of the snap-fit ​​member (12) extends to the outside of the fixed shell (11) and is fixedly connected to the top cover (2).

3. The reverse connection protection structure for the photovoltaic module junction box according to claim 2, characterized in that: The front and rear sides of the fixed shell (11) are fixedly connected with fixed blocks (13), and the fixed blocks (13) are fixedly connected to the box body (1).

4. The reverse connection protection structure for the photovoltaic module junction box according to claim 1, characterized in that: Limiting grooves are provided on both sides of the inner cavity of the threaded cover (4), and limiting blocks (14) are movably connected to the inner cavity of the limiting grooves. The two limiting blocks (14) are fixedly connected to the fixing clamp (6) relative to each other.

5. The reverse connection protection structure for the photovoltaic module junction box according to claim 1, characterized in that: A sealing ring (15) is fixedly connected to the front side of the threaded cover (4), and the inner cavity of the sealing ring (15) is tightly fitted with the cable.

6. The reverse connection protection structure for the photovoltaic module junction box according to claim 1, characterized in that: The bottom of the inner cavity of the threaded cover (4) and the bottom of the fixing clip (6) are provided with anti-slip textures (16), and the two anti-slip textures (16) are closely attached to the cable.

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