Board end connector for photovoltaic combiner box and photovoltaic inverter

Abstract

The utility model relates to the technical field of fuse connectors, and provides a board end connector for a photovoltaic combiner box and a photovoltaic inverter, which comprises a fixed seat, a locking seat, a first wiring terminal, a second wiring terminal and a fuse, the fixing seat and the locking seat are coaxially and detachably connected to form a cavity for accommodating the fuse, the fuse is arranged in the cavity, and after the fixing seat and the locking seat are detached and separated, the end part of the fuse is exposed. And the first wiring terminal and the second wiring terminal are respectively arranged at two ends of the fuse and are respectively used for forming electric connection with an external wiring structure. According to the utility model, the defects in the prior art are overcome, the design is reasonable, the maintenance is convenient, and the technical problem that the whole fuse replacement process of the existing photovoltaic system is relatively tedious is solved.

Description

Technical Field

[0001] This utility model relates to the field of fuse connector technology, specifically to a board-end connector for photovoltaic combiner boxes and photovoltaic inverters. Background Technology

[0002] When a fuse in the combiner box or inverter of a photovoltaic system fails, the staff needs to open the box, lift the cover of the fuse mounting bracket, pry out the damaged fuse, replace it with a new one, and finally close the cover of the fuse mounting bracket and the box cover. The entire fuse replacement process is quite cumbersome.

[0003] Therefore, we propose a board-end connector for photovoltaic combiner boxes and photovoltaic inverters. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides a board-end connector for photovoltaic combiner boxes and photovoltaic inverters. It overcomes the deficiencies of existing technologies, has a reasonable design, is easy to maintain, and solves the technical problem of the cumbersome process of replacing the fuses in existing photovoltaic combiner boxes and photovoltaic inverters.

[0005] Technical solution

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A board-end connector for photovoltaic combiner boxes and photovoltaic inverters includes a mounting base, a locking base, a first terminal block, a second terminal block, and a fuse. Both the mounting base and the locking base are hollow structures extending through both ends. The mounting base and the locking base are coaxially and detachably connected to form a cavity for housing the fuse. The fuse is installed within the cavity. When the mounting base and the locking base are disassembled, the end of the fuse is exposed. The first terminal block and the second terminal block are respectively installed at both ends of the fuse and are used to form electrical connections with external wiring structures.

[0008] Furthermore, the first terminal block and the second terminal block are fixedly connected to the metal caps at both ends of the fuse;

[0009] The front end of the first terminal and the second terminal is a solid or hollow structure;

[0010] The front end of the rod is connected to the external circuit via a plug-in connection.

[0011] Alternatively, a wire can be inserted into the hollow structure of the front rod, pressed tightly, and then electrically connected to an external circuit.

[0012] Furthermore, the end of the fixing seat is formed with a coaxial threaded sleeve, the inner cavity of the locking seat is formed with an internal thread, and the threaded sleeve is threadedly connected to the internal thread.

[0013] Furthermore, the inner cavity of the fixing seat is formed with an internal thread, and the end of the locking seat is formed with a coaxial threaded sleeve, which is threadedly connected to the internal thread.

[0014] Furthermore, a quick connector is formed at the end of the locking seat, which is either a male or a female connector.

[0015] Furthermore, both the first and second terminals include a conductive rod and a conductive sleeve fixed to the tail end of the conductive rod. The side wall of the conductive sleeve is provided with slits distributed in the circumferential direction, and an elastic flap is formed between adjacent slits. The conductive sleeve is sleeved on the outside of the electrode of the fuse, and its elastic flap clamps and fixes the electrode through its own elasticity.

[0016] Furthermore, the first inner cavity of the fixing seat and the second inner cavity of the locking seat are joined together to form the cavity. Both the first inner cavity and the second inner cavity are stepped holes. The conductive sleeve of the first terminal abuts against the stepped surface of the first inner cavity, and the conductive sleeve of the second terminal abuts against the stepped surface of the second inner cavity.

[0017] Furthermore, the main body of the first terminal is located within the fixed base, and the conductive rod of the first terminal includes a front conductive rod body, a middle flexible conductive wire, and a rear conductive rod body that are electrically connected in sequence.

[0018] Furthermore, the first inner cavity includes a first hole, a second hole, a third hole, and a fourth hole that are coaxially connected in sequence and whose diameters increase in sequence.

[0019] The connector also includes a second spring and a limiting ring;

[0020] The second spring is installed in the second hole, and the second spring is sleeved on the conductive rod of the first terminal, with its two ends abutting against the stepped surface of the second hole (connected to the first hole) and the end face of the conductive sleeve, respectively.

[0021] The limiting ring is installed in the fourth hole and its end abuts against the stepped surface of the fourth hole (which connects with the third hole);

[0022] The elastic flap of the first terminal block tilts outward without being subjected to external force, and the tilted end of the elastic flap is axially limited by the limiting ring.

[0023] Furthermore, the end of the limiting ring is bonded and fixed to the stepped surface of the fourth hole.

[0024] Furthermore, the limiting ring and the fourth hole are threaded together.

[0025] Furthermore, both the first and second terminals include a conductive rod and a conductive sleeve fixed to the tail end of the conductive rod. The first and / or second terminals are provided with a first spring that ejects the fuse. Under the action of the locking seat, the electrode of the fuse extends into the conductive sleeve and compresses the first spring. After the locking seat is released, the electrode of the fuse is ejected from the conductive sleeve under the elastic force of the first spring.

[0026] Furthermore, the conductive rod has a mounting hole at one end facing the conductive sleeve, and one end of the first spring is received in the mounting hole.

[0027] This utility model provides a board-end connector for photovoltaic combiner boxes and photovoltaic inverters, which has the following advantages:

[0028] The fuse is installed in the fuse connector at the board end, specifically in the cavity formed by the assembly of a fixing seat and a locking seat. The fixing seat is built into the enclosure (the enclosure of a photovoltaic combiner box or photovoltaic inverter), and its threaded sleeve passes through the side plate of the enclosure and engages with the threaded locking seat. When the fuse needs to be replaced, simply unscrew the locking seat on the outside of the enclosure to expose the damaged fuse, making it easy to quickly pull out the fuse for replacement. There is no need to open or close the enclosure or pry out the fuse, which simplifies the installation and replacement process, reduces installation time, lowers the difficulty of operation, and improves the convenience and efficiency of maintenance.

[0029] The elastic flap of the first terminal sticks outwards when not subjected to external force. A second spring and a limiting ring are added on this basis, and the first inner cavity of the fixing base is set as a multi-hole stepped shape. The elastic flap of the first terminal sticks retracts inwards under the limitation of the hole wall of the first inner cavity, wrapping, clamping and fixing the electrode part of the fuse. When the fuse needs to be replaced, the fuse is pulled outwards, and the first terminal sticks outwards axially under the action of the second spring. After the elastic flaps are released from the original hole wall limitation, they return to the state of sticking outwards, which makes it easy to insert the replaced fuse. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the assembled structure of embodiments 1, 2, and 3 of this utility model, wherein a male head is formed at the end of the locking seat;

[0031] Figure 2 This corresponds to Embodiment 1 of the present utility model. Figure 1 A schematic diagram of the exploded structure;

[0032] Figure 3 This corresponds to Embodiment 2 of the present utility model. Figure 1 A schematic diagram of the exploded structure;

[0033] Figure 4 This is a schematic diagram of the assembled structure of embodiments 1, 2, and 3 of this utility model, wherein a female head is formed at the end of the locking seat;

[0034] Figure 5 This corresponds to Embodiment 3 of the present utility model. Figure 1 A schematic diagram of the exploded structure;

[0035] Figure 6 This is a cross-sectional view of the first state of the locking seat in Embodiment 3 of this utility model, omitting the actual locking seat.

[0036] Figure 7 for Figure 6 A magnified structural diagram of point A in the middle;

[0037] Figure 8 This is a schematic diagram of the structure of the first terminal block in Example 3;

[0038] Figure 9 This is a cross-sectional view of the second state of Embodiment 3 of the present invention, omitting the locking seat;

[0039] Figure 10 for Figure 9 A magnified structural diagram of section B in the middle;

[0040] Figure 11 This is a schematic diagram of the structure in which the second terminal block, the first spring, and the fuse are connected.

[0041] In the picture:

[0042] 1. Fixed base;

[0043] 11. First inner cavity;

[0044] 111. First hole;

[0045] 112. Second hole;

[0046] 1121. Chamfering;

[0047] 113. Third hole section;

[0048] 114. Fourth hole section;

[0049] 12. Threaded sleeve;

[0050] 13. First locking part;

[0051] 2. Locking seat;

[0052] 3. First terminal block;

[0053] 31. Front conductive rod;

[0054] 32. Middle section of conductive wire;

[0055] 33. Rear conductive rod;

[0056] 341. Elastic valve;

[0057] 342. Slit;

[0058] 4. Second terminal block;

[0059] 4a. Mounting holes;

[0060] 5. Fuses;

[0061] 6. The second spring;

[0062] 7. Limiting ring;

[0063] 8. Tighten the nut;

[0064] 9. The first spring. Detailed Implementation

[0065] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model. Example

[0066] See attached document Figure 1 , 2 4. A board-end connector for photovoltaic combiner boxes and photovoltaic inverters, comprising a fixing base 1, a locking base 2, a first terminal block 3, a second terminal block 4, and a fuse 5. The fixing base 1 and the locking base 2 are both hollow structures with through ends. The fixing base 1 and the locking base 2 are coaxially and detachably connected to form a cavity for accommodating the fuse 5. The fuse 5 is installed in the cavity. When the fixing base 1 and the locking base 2 are disassembled, the end of the fuse 5 is exposed. The first terminal block 3 and the second terminal block 4 are respectively installed at both ends of the fuse 5 and are respectively used to form an electrical connection with an external wiring structure.

[0067] The first inner cavity of the fixing seat 1 and the second inner cavity of the locking seat 2 are joined together to form the cavity. Both the first inner cavity and the second inner cavity are stepped holes. The first terminal 3 abuts against the stepped surface of the first inner cavity, and the second terminal 4 abuts against the stepped surface of the second inner cavity.

[0068] In this embodiment, please refer to the appendix. Figure 6The fixed seat 1 has a coaxial threaded sleeve 12 at its end, and the locking seat 2 has an internal threaded portion in its inner cavity. During installation, the threaded sleeve 12 passes through the side plate of the housing and is threadedly connected to the internal threaded portion. The end of the fixed seat 1 that connects to the threaded sleeve 12 has a hexagonal first locking portion 13, and the end of the locking seat 2 with the internal threaded portion has a hexagonal second locking portion. The first and second locking portions facilitate clamping and tightening with a wrench, and a locking nut 8 can be added to the threaded sleeve 12 to clamp and fix the fixed seat 1 and the side plate of the housing. In some other embodiments, the fixed seat 1 has an internal threaded portion in its inner cavity, and the locking seat 2 has a coaxial threaded sleeve 12 at its end, which is threadedly connected to the internal threaded portion.

[0069] In some embodiments, the locking seat 2 has a quick connector at its end for easy and quick insertion and engagement; the quick connector is either a male or a female connector.

[0070] In this embodiment, the first terminal 3, the second terminal 4, and the metal caps at both ends of the fuse 5 are fixedly connected;

[0071] The front end rods of the first terminal 3 and the second terminal 4 are solid or hollow structures;

[0072] The front end of the rod is connected to the external circuit via a plug-in connection.

[0073] Alternatively, a wire can be inserted into the hollow structure of the front rod, pressed tightly, and then electrically connected to an external circuit. Example

[0074] See attached document Figure 1 , 3 4. The first terminal 3 and the second terminal 4 are detachably connected to the metal cap of the fuse. Both the first terminal 3 and the second terminal 4 include a conductive rod and a conductive sleeve fixed to the tail end of the conductive rod. The conductive sleeve is a sleeve structure with one end closed and the other open. The side wall of the conductive sleeve has slits 342 distributed along the circumferential direction, and elastic flaps 341 are formed between adjacent slits 342. The conductive sleeve is fitted over the electrode of the fuse 5, and its elastic flaps 341 clamp and fix the electrode by their own elasticity.

[0075] In some embodiments, refer to the appendix Figure 11The first terminal 3 and the second terminal 4 are provided with a second spring to eject the fuse. Specifically, taking the second terminal 4 as an example, its conductive rod has a mounting hole 4a at one end facing the conductive sleeve. One end of the first spring 9 is received in the mounting hole 4a. When the locking seat 2 is locked and fixed with the fixing seat 1, the electrode of the fuse 5 extends into the conductive sleeve and compresses the first spring 9 under the action of the locking seat 2. When the locking seat 2 is locked and unlocked from the fixing seat 1, the locking seat 2 is released, and the electrode of the fuse 5 is ejected from the conductive sleeve under the elastic force of the first spring 9. Example

[0076] See attached document Figure 5-10 The difference between Embodiment 2 and Embodiment 1 is as follows: the first inner cavity 11 includes a first hole 111, a second hole 112, a third hole 113 and a fourth hole 114 that are coaxially connected in sequence and whose diameters increase in sequence.

[0077] The connector also includes a second spring 6 and a limiting ring 7;

[0078] The second spring 6 is installed in the second hole 112. The second spring 6 is sleeved on the conductive rod of the first terminal 3 and its two ends abut against the stepped surface of the second hole 112 (connected to the first hole 111) and the end face of the conductive sleeve, respectively.

[0079] The limiting ring 7 is installed in the fourth hole 114 and its end abuts against the stepped surface of the fourth hole 114 (which is connected to the third hole 113);

[0080] The main body of the first terminal 3 is located in the fixed base 1. The conductive rod of the first terminal 3 includes a front conductive rod 31 body, a middle flexible conductive wire 32 and a rear conductive rod 33 body that are electrically connected in sequence. The front conductive rod 31 body and the middle flexible conductive wire 32 can extend out from the first hole 111.

[0081] The elastic flap 341 of the first terminal 3 tilts outward without being subjected to external force, and the tilted end of the elastic flap 341 is axially limited by the limiting ring 7.

[0082] In Embodiment 2, the first terminal 3 was modified. If the conductive rod of the first terminal 3 is fixed to the circuit board inside the return box by welding, on the one hand, a flexible conductive wire 32 is added to the conductive rod. The flexible conductive wire 32 can reduce its volume by squeezing and curling during installation, which can play a supplementary role when the first terminal 3 moves outward axially. On the other hand, the first terminal 3 is housed in the fixing base 1 and cannot be removed when replacing the fuse 5. If the elastic flap 341 of its conductive sleeve is excessively contracted inward under its elastic force, it may obstruct the insertion of the fuse 5. Therefore, in Embodiment 2, the wall of the second hole 112 is used to contract the outwardly protruding elastic flap 341 to achieve clamping and fixing of the fuse 5. A chamfer 1121 can also be designed at the port of the second hole 112 for transition. In other embodiments, the second terminal 4 can also use the above-described structure of Embodiment 2 to clamp and fix the fuse 5.

[0083] The elastic flap 341 of the first terminal 3 tilts outward without external force. Based on this, a second spring 6 and a limiting ring 7 are added, and the first inner cavity 11 of the fixing base 1 is configured as a multi-hole stepped shape. (See attached diagram.) Figure 8 , 9 The elastic flap 341 of the first terminal 3 retracts inward under the constraint of the hole wall of the second hole 112, wrapping, clamping, and fixing the electrode part of the fuse 5. When the fuse 5 needs to be replaced, refer to the attached document. Figure 6 , 7 During the process of unscrewing the locking seat 2 outward, the fuse 5 and the first terminal 3 are simultaneously pulled outward under the action of the second spring 6. During the outward pulling process, the limiting ring plays an axial limiting role on the first terminal 3 to prevent the first terminal from being pulled out excessively, which would cause the weld of its front conductive rod to tear. It also allows the end of the conductive sleeve to be restricted in the second hole 112, making it convenient for the two to be inserted. After the elastic flap 341 is released from the hole wall of the second hole 112, it returns to the outward tilted state, releasing the clamping and fixing of the fuse 5, so that the fuse 5 can be pulled outward. At the same time, the conductive sleeve also forms a flared structure to facilitate the insertion of the replaced fuse 5.

[0084] In this embodiment, the end of the limiting ring 7 is bonded and fixed to the stepped surface of the fourth hole 114, or the limiting ring 7 and the fourth hole 114 are threaded together.

[0085] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0086] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A board-end connector for photovoltaic combiner boxes and photovoltaic inverters, characterized in that: The device includes a mounting base, a locking base, a first terminal block, a second terminal block, and a fuse. Both the mounting base and the locking base are hollow structures that extend through both ends. The mounting base and the locking base are coaxially and detachably connected to form a cavity for housing the fuse. The fuse is installed in the cavity. When the mounting base and the locking base are disassembled, the end of the fuse is exposed. The first terminal block and the second terminal block are respectively installed at both ends of the fuse and are used to form an electrical connection with an external wiring structure.

2. The board-end connector for photovoltaic combiner boxes and photovoltaic inverters as described in claim 1, characterized in that: The first terminal block and the second terminal block are fixedly connected to the metal caps at both ends of the fuse; The front end of the first terminal and the second terminal is a solid or hollow structure; The front end of the rod is connected to the external circuit via a plug-in connection. Alternatively, a wire can be inserted into the hollow structure of the front rod, pressed tightly, and then electrically connected to an external circuit.

3. The board-end connector for photovoltaic combiner boxes and photovoltaic inverters as described in claim 1, characterized in that: The end of the fixed seat is formed with a coaxial threaded sleeve, and the inner cavity of the locking seat is formed with an internal thread, and the threaded sleeve is threadedly connected to the internal thread.

4. A board-end connector for photovoltaic combiner boxes and photovoltaic inverters as described in claim 1, characterized in that: The inner cavity of the fixed seat has an internal thread, and the end of the locking seat has a coaxial threaded sleeve, which is threadedly connected to the internal thread.

5. A board-end connector for photovoltaic combiner boxes and photovoltaic inverters as described in claim 1, characterized in that: The locking seat has a quick connector at its end, which can be either a male or female connector.

6. A board-end connector for photovoltaic combiner boxes and photovoltaic inverters as described in claim 1, characterized in that: Both the first and second terminals include a conductive rod and a conductive sleeve fixed to the tail end of the conductive rod. The side wall of the conductive sleeve is provided with slits distributed in the circumferential direction, and an elastic flap is formed between adjacent slits. The conductive sleeve is sleeved on the outside of the electrode of the fuse, and its elastic flap clamps and fixes the electrode through its own elasticity.

7. A board-end connector for photovoltaic combiner boxes and photovoltaic inverters as described in claim 6, characterized in that: The first inner cavity of the fixing seat and the second inner cavity of the locking seat are joined together to form the cavity. Both the first inner cavity and the second inner cavity are stepped holes. The conductive sleeve of the first terminal abuts against the stepped surface of the first inner cavity, and the conductive sleeve of the second terminal abuts against the stepped surface of the second inner cavity.

8. A board-end connector for photovoltaic combiner boxes and photovoltaic inverters as described in claim 7, characterized in that: The main body of the first terminal block is located inside the fixed base, and the conductive rod of the first terminal block includes a front conductive rod body, a middle flexible conductive wire and a rear conductive rod body that are electrically connected in sequence.

9. A board-end connector for photovoltaic combiner boxes and photovoltaic inverters as described in claim 1, characterized in that: Both the first and second terminals include a conductive rod and a conductive sleeve fixed to the tail end of the conductive rod. The first and / or second terminals are provided with a first spring that ejects the fuse. Under the action of the locking seat, the electrode of the fuse extends into the conductive sleeve and compresses the first spring. After the locking seat is released, the electrode of the fuse is ejected from the conductive sleeve under the elastic force of the first spring.

10. A board-end connector for photovoltaic combiner boxes and photovoltaic inverters as described in claim 9, characterized in that: The conductive rod has a mounting hole at one end facing the conductive sleeve, and one end of the first spring is received in the mounting hole.

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