A kind of distributed photovoltaic junction box protection device

Abstract

The application relates to the technical field of confluence boxes, and particularly discloses a distributed photovoltaic confluence box protection device, which comprises a pressure plate, the top of the pressure plate is provided with a placing plate, a starting mechanism is installed between a box body and a box door, the starting mechanism is started when the box door is closed, a sealing mechanism is installed between the placing plate and the pressure plate, the sealing mechanism seals the cable holes which are not penetrated by cables and compresses the rubber pads of the cable holes which are penetrated by cables when the starting mechanism is started, the rubber ring inserted into the cables is compressed, the sealing property of the confluence box is maintained, the rubber ring inserted into the cables is completely blocked, the metal part directly extrudes the rubber ring, small animals are not easy to bite or drill into the confluence box, and the damage to the electronic components in the confluence box is reduced.

Description

Technical Field

[0001] This invention relates to the field of combiner box technology, specifically a protection device for a distributed photovoltaic combiner box. Background Technology

[0002] A solar photovoltaic combiner box, also known as a solar combiner box, performs primary current combining for the input of a photovoltaic cell array. This reduces the number of wires connecting the photovoltaic cell array to the inverter, optimizes the system structure, and improves reliability and maintainability.

[0003] Combiner boxes are typically installed on brackets at the bottom of photovoltaic panels. Wiring from multiple photovoltaic panels is then passed through through-holes at the bottom of the combiner box and directly connected to a switch inside. Photovoltaic power generation is usually located in remote areas. Since the solar energy absorbed by the photovoltaic panels is collected into the grid via the combiner box's motor components, a certain temperature is generated inside the combiner box. Because the temperature inside the combiner box is higher than the ambient temperature due to the current flow, some cable holes are usually pre-drilled at the bottom for future use. After installation, any excess through-holes are sealed with rubber plugs to reduce dust and moisture entering the combiner box. However, due to the high temperature inside the combiner box, small animals (such as mice or snakes, which prefer warm temperatures) can easily drill or bite open the rubber plugs and enter the combiner box, potentially damaging the internal electronic components. Therefore, we propose a protection device for distributed photovoltaic combiner boxes. Summary of the Invention

[0004] The purpose of this invention is to provide a protection device for distributed photovoltaic combiner boxes to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a distributed photovoltaic combiner box protection device, comprising:

[0006] Pressure plate, with a placement plate on top;

[0007] The starting mechanism is installed between the enclosure and the door, and it is activated when the door is closed.

[0008] The sealing mechanism is installed between the placement plate and the pressure plate. When the starting mechanism is activated, the sealing mechanism seals the cable hole where the cable is not inserted and presses the rubber pad of the cable hole where the cable is inserted.

[0009] Preferably, the pressure plate and the placement plate are fixedly connected, and the surfaces of the pressure plate and the placement plate are provided with multiple through holes that correspond one-to-one with the bottom cable holes.

[0010] Preferably, the starting mechanism includes a fixed sleeve installed on the inner wall of the box, an abutment rod slidably connected inside the fixed sleeve, a spring between the abutment rod and the fixed sleeve, the two ends of the spring being fixedly connected to the fixed sleeve and the abutment rod respectively, an elastic mechanism at the bottom of the pressure plate, a protrusion fixedly connected to the top of the placement plate, and a pressing rod fixedly connected to the side of the abutment rod, the surface of the protrusion being inclined.

[0011] Preferably, the elastic mechanism includes multiple guide sleeves fixedly connected to the bottom of the pressure plate, a guide post fixedly connected to the bottom of the inner wall of the box, the guide sleeves and the guide post being slidably connected, and a second spring inside the guide sleeve, with both ends of the second spring fixedly connected to the guide post and the guide sleeve respectively.

[0012] Preferably, the through hole has an internal thread, the sealing mechanism includes a bolt that is threadedly connected to the through hole, a hemispherical pressure block is fixedly connected to the bottom of the bolt, and the bottom of the pressure plate is provided with multiple pressure cylinders that press against the surface of the rubber pad.

[0013] Preferably, the sealing mechanism includes a hollow movable sleeve, a spring three between the movable sleeve and the placement plate, the two ends of the spring three being fixedly connected to the placement plate and the movable sleeve respectively, a magnet being fixedly connected to the top of the movable sleeve, an electromagnet being provided between the placement plate and the pressure plate, a movable cavity being provided inside the movable sleeve, a metal ball being provided inside the movable cavity, and multiple electrode plates one and two being provided inside the movable cavity, the electrode plates one being in a raised state, the electrode plates one and two being electrically connected to the electromagnet, the protrusion and the pressure rod being electrically connected to the electromagnet, and a rubber layer being provided inside the movable sleeve.

[0014] Preferably, the magnet has a sealing plug inside, the sealing plug is cylindrical, and the top of the sealing plug has a connecting part that is fixedly connected to the magnet.

[0015] Preferably, the movable sleeve includes a first collar and a second collar, which slide relative to each other. A fourth spring is provided between the first collar and the second collar, and the two ends of the fourth spring are fixedly connected to the first collar and the second collar, respectively.

[0016] This invention has at least the following beneficial effects:

[0017] The sealing mechanism is activated when the junction box door is closed by an activation mechanism. This sealing mechanism presses and seals the rubber rings of the inserted cables, and completely seals the rubber rings of the uninserted cables. Compared to existing technologies, where the junction box temperature is high and small animals (such as mice or snakes that prefer warm temperatures) can easily drill or bite open the rubber plugs and enter the junction box, potentially damaging the internal electronic components, this invention presses the rubber rings of the inserted cables to maintain the junction box's airtightness. The rubber rings of the inserted cables are completely blocked, and the metal parts directly compress the rubber rings, making it difficult for small animals to bite or crawl into the junction box, thus reducing damage to the internal electronic components. Furthermore, when the box door is open to install cables, the sealing and activation mechanisms are in a relaxed state, allowing workers to easily connect the cables to the electronic components inside the junction box. When the box door is closed, the sealing mechanism is activated by the activation mechanism, providing ample protection for the junction box. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of the present invention;

[0019] Figure 2 This is a structural diagram from another perspective of the present invention;

[0020] Figure 3 This is a partial structural diagram of the present invention;

[0021] Figure 4 This is a partial cross-sectional view of the starting mechanism of the present invention;

[0022] Figure 5 This is a structural diagram of Embodiment 1 of the present invention;

[0023] Figure 6 This is a partial cross-sectional view of the sealing mechanism of the present invention;

[0024] Figure 7 These are structural diagrams of Embodiments 2 and 3 of the present invention.

[0025] In the diagram: 1-Box body; 2-Box door; 3-Pressure plate; 4-Placement plate; 5-Starting mechanism; 51-Fixing sleeve; 52-Abutting rod; 53-Spring 1; 54-Protrusion; 55-Extrusion rod; 6-Sealing mechanism; 61-Bolt; 62-Pressure block; 63-Pressure cylinder; 64-Spring 3; 65-Magnet; 66-Electromagnet; 67-Moving cavity; 68-Metal ball; 69-Rubber layer; 7-Elastic mechanism; 71-Guide post; 72-Guide sleeve; 73-Spring 2; 8-Moving sleeve; 81-Collar 1; 82-Collar 2; 83-Spring 4; 9-Rubber pad; 10-Through hole; 11-Electrode plate 1; 12-Electrode plate 2; 13-Sealing plug. Detailed Implementation

[0026] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] Please see Figure 1-7 The present invention provides a technical solution:

[0028] Example 1,

[0029] A protection device for a distributed photovoltaic combiner box, comprising:

[0030] Pressure plate 3, with a placement plate 4 on top of pressure plate 3;

[0031] The starting mechanism 5 is installed between the enclosure 1 and the door 2. The starting mechanism 5 is activated when the door 2 is closed. The starting mechanism 5 can easily unlock the sealing mechanism 6 when the door 2 is open, which makes it convenient for staff to replace and inspect the cable.

[0032] The sealing mechanism 6 is installed between the placement plate 4 and the pressure plate 3. When the starting mechanism 5 is started, the sealing mechanism 6 seals the cable hole where the cable is not inserted and presses the rubber pad 9 of the cable hole where the cable is inserted. The sealing mechanism 6 can conveniently seal the rubber pad 9 of the inserted cable and the rubber pad 9 of the uninserted cable at the same time, increasing the sealing performance, reducing the entry of dust and moisture, and facilitating the use of the junction box.

[0033] The pressure plate 3 is fixedly connected to the placement plate 4. The surfaces of the pressure plate 3 and the placement plate 4 are provided with multiple through holes 10 that correspond one-to-one with the bottom cable holes. The remaining through holes 10 can be directly connected to the main cable and other cable bundles. As for the cables of the photovoltaic panel, multiple holes will be reserved to facilitate future maintenance and addition.

[0034] The starting mechanism 5 includes a fixed sleeve 51 installed on the inner wall of the housing 1. The fixed sleeve 51 is fixedly connected to the inner wall of the housing 1. An abutment rod 52 is slidably connected inside the fixed sleeve 51. The cross-section of the abutment rod 52 is non-circular. A spring 53 is provided between the abutment rod 52 and the fixed sleeve 51. The two ends of the spring 53 are fixedly connected to the fixed sleeve and the abutment rod 52 respectively. An elastic mechanism 7 is provided at the bottom of the pressure plate 3. A protrusion 54 is fixedly connected to the top of the placement plate 4. A pressing rod 55 is fixedly connected to the side of the abutment rod 52. The surface of the protrusion 54 is inclined.

[0035] The elastic mechanism 7 includes multiple guide sleeves 72 fixedly connected to the bottom of the pressure plate 3. A guide post 71 is fixedly connected to the bottom of the inner wall of the housing 1. The guide sleeves 72 are slidably connected to the guide post 71. A second spring 73 is provided inside the guide sleeve 72. The two ends of the second spring 73 are fixedly connected to the guide post 71 and the guide sleeve 72 respectively.

[0036] The through hole 10 has an internal thread. The sealing mechanism 6 includes a bolt 61 that is threadedly connected to the through hole 10. A hemispherical pressure block 62 is fixedly connected to the bottom of the bolt 61. The pressure block 62 is an iron block, so that small animals cannot drill or bite through it. The bottom of the pressure plate 3 is provided with multiple pressure cylinders 63 that press the surface of the rubber pad 9.

[0037] When the workers install the combiner box, they will place it on the side of the photovoltaic panel bracket and open the box door 2. At this time, the pressing rod 55 will disengage from the inclined surface of the protrusion 54 under the action of spring 53, and spring 73 will rebound, causing the placement plate 4 and pressure plate 3 to rise. The workers will then unscrew the bolts 61 that need to pass through the wires and pass the cables through the through holes 10 of the placement plate 4 and pressure plate 3, which will facilitate the assembly of the cables. After the cables are assembled, the workers will close the box door 2, and the box door 2 will press against the abutment rod 52, compressing spring 53. The extrusion rod 55 moves on the inclined surface of the protrusion 54, the placement plate 4 and the pressure plate 3 descend, the spring 73 is compressed, and the rubber pad 9 with the cable installed is pressed down by the pressure cylinder 63, thereby pressing the cable and the rubber pad 9 tightly. The pressure block 62 at the bottom of the screw without the cable installed cooperates with the pressure cylinder 63 to squeeze the surface of the rubber pad 9, thereby blocking the through hole 10 of the rubber pad 9, and at the same time squeezing the outside of the rubber pad 9 inward, thereby sealing the rubber pad 9 and the box 1, thus facilitating the sealing of the entire box 1 and reducing the possibility of small animals entering the box 1.

[0038] According to the above embodiments, Embodiment Two

[0039] The sealing mechanism 6 includes a hollow movable sleeve 8, which is slidably connected to the placement plate 4 and the pressure plate 3. A spring 64 is provided between the movable sleeve 8 and the placement plate 4, with both ends of the spring 64 fixedly connected to the placement plate 4 and the movable sleeve 8, respectively. A magnet 65 is fixedly connected to the top of the movable sleeve 8. An electromagnet 66 is provided between the placement plate 4 and the pressure plate 3, and the electromagnet 66 is fixedly connected to both the pressure plate 3 and the placement plate 4. A movable cavity 67 is provided inside the movable sleeve 8, and a metal ball 68 is provided inside the movable cavity 67. The metal ball 68 can move within the movable cavity 67. Multiple electrode plates 11 and 2 electrode plates 12 are provided inside the movable cavity 67. The electrode plates 11 are in a raised state. The electrode plates 11 and 2 electrode plates 12 are electrically connected to the electromagnet 66. A protrusion 54 and a pressing rod 55 are electrically connected to the electromagnet 66. A rubber layer 69 is provided inside the movable sleeve 8, and the rubber layer 69 is fixedly connected to the movable sleeve 8.

[0040] After the staff opens the door 2, the protrusion 54 separates from the pressing rod 55, and the metal ball 68 is located at the bottom of the movable cavity 67. When the staff inserts the cable into the movable sleeve 8, the cable pushes the metal ball 68 upward, and the metal ball 68 is pushed into the movable cavity 67. Then, the metal ball 68 presses down on the electrode plate 11 under its own weight, and the electrode plate 11 contacts the electrode plate 2. At this time, the cable installation is complete. Then the door 2 is closed, the pressing rod 55 contacts the protrusion 54, and the electrode plate 11 contacts the electrode plate 2. At this time, the electromagnet 66 is not energized, and the movable sleeve 8 without the cable is closed. Electrode 11 and electrode 12 are separated. Electromagnet 66 is energized here. When energized, electromagnet 66 attracts magnet 65 to descend. Magnet 65 pushes movable sleeve 8 to descend and press against the surface of rubber pad 9, thereby increasing the sealing performance of rubber pad 9. The above-mentioned sealing of rubber pad 9 can further increase the sealing performance of rubber pad 9. Rubber pad 9 with cable inserted can be directly sealed by pressure cylinder 63. There is a gap in the middle of rubber pad 9 without cable inserted. Movable sleeve 8 can provide stable extrusion pressure for it, thereby facilitating the sealing of rubber pad 9 without cable inserted.

[0041] According to the above embodiments, in Embodiment 3,

[0042] The magnet 65 has a sealing plug 13 inside. The sealing plug 13 is cylindrical and has a connecting part at the top that is fixedly connected to the magnet 65. The sealing plug 13 is a sealing ring 81 inside, forming a double seal with the metal ball 68 to ensure the sealing of the movable sleeve 8.

[0043] The movable sleeve 8 includes a first sleeve 81 and a second sleeve 82. The first sleeve 81 and the second sleeve 82 slide relative to each other. A fourth spring 83 is provided between the first sleeve 81 and the second sleeve 82. The two ends of the fourth spring 83 are fixedly connected to the first sleeve 81 and the second sleeve 82 respectively.

[0044] When the electromagnet 66 attracts the magnet 65, the first collar 81 and the second collar 82 are relatively compressed, and a positive pressure is formed in the sealed space between the first collar 81 and the second collar 82. The pressure is instantly applied to the metal ball 68 and the sealing plug 13. The metal ball 68 is quickly pressed down to the surface of the rubber layer 69, so that the metal ball 68 and the rubber layer 69 form a relative seal, enhancing the sealing effect. In addition, the instantaneous attraction generated by the electromagnet 66 to the magnet 65 will also force the metal ball 68 to vibrate relative to the rubber layer 69, which further facilitates the sealing of the second collar 82 by the metal ball 68. Even if some small insects burrow into the bottom of the metal ball 68, they do not have enough force to push the metal ball 68 to the top of the first collar 81, further reducing the possibility of small insects entering the junction box.

[0045] 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 process, method, article, or apparatus.

[0046] Although embodiments of the 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 invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A protection device for a distributed photovoltaic combiner box, characterized in that: include: Pressure plate (3), the top of which is provided with a placement plate (4); A starting mechanism (5) is installed between the housing (1) and the door (2), and the starting mechanism (5) is activated when the door (2) is closed; The sealing mechanism (6) is installed between the placement plate (4) and the pressure plate (3). When the starting mechanism (5) is started, the sealing mechanism (6) seals the cable hole that is not inserted into the cable and presses the rubber pad (9) on the cable hole that is inserted into the cable. The pressure plate (3) is fixedly connected to the placement plate (4); The starting mechanism (5) includes a fixed sleeve (51) installed on the inner wall of the housing (1). A connecting rod (52) is slidably connected inside the fixed sleeve (51). A spring (53) is provided between the connecting rod (52) and the fixed sleeve (51). The two ends of the spring (53) are fixedly connected to the fixed sleeve (51) and the connecting rod (52) respectively. An elastic mechanism (7) is provided at the bottom of the pressure plate (3). A protrusion (54) is fixedly connected to the top of the placement plate (4). A pressing rod (55) is fixedly connected to the side of the connecting rod (52). The surface of the protrusion (54) is inclined. The pressing rod (55) moves on the inclined surface of the protrusion (54).

2. The distributed photovoltaic combiner box protection device according to claim 1, characterized in that: The pressure plate (3) and the placement plate (4) have multiple through holes (10) that correspond one-to-one with the bottom cable holes.

3. The distributed photovoltaic combiner box protection device according to claim 2, characterized in that: The elastic mechanism (7) includes multiple guide sleeves (72) fixedly connected to the bottom of the pressure plate (3). A guide post (71) is fixedly connected to the bottom of the inner wall of the box (1). The guide sleeve (72) is slidably connected to the guide post (71). A second spring (73) is provided inside the guide sleeve (72). The two ends of the second spring (73) are fixedly connected to the guide post (71) and the guide sleeve (72) respectively.

4. A distributed photovoltaic combiner box protection device according to claim 2, characterized in that: The through hole (10) is provided with an internal thread. The sealing mechanism (6) includes a bolt (61) that is threadedly connected to the through hole (10). A hemispherical pressure block (62) is fixedly connected to the bottom of the bolt (61). The bottom of the pressure plate (3) is provided with a plurality of pressure cylinders (63) that press against the surface of the rubber pad (9) on the cable hole through which the cable is inserted.

5. A distributed photovoltaic combiner box protection device according to claim 2, characterized in that: The sealing mechanism (6) includes a hollow movable sleeve (8), a spring three (64) between the movable sleeve (8) and the placement plate (4), the two ends of the spring three (64) being fixedly connected to the placement plate (4) and the movable sleeve (8) respectively, a magnet (65) being fixedly connected to the top of the movable sleeve (8), an electromagnet (66) between the placement plate (4) and the pressure plate (3), a movable cavity (67) is opened inside the movable sleeve (8), a metal ball (68) is provided inside the movable cavity (67), a plurality of electrode plates one (11) and electrode plates two (12) are provided inside the movable cavity (67), the electrode plates one (11) are in a raised state, the electrode plates one (11) and electrode plates two (12) are electrically connected to the electromagnet (66), the protrusion (54) and the extrusion rod (55) are electrically connected to the electromagnet (66), and a rubber layer (69) is provided inside the movable sleeve (8).

6. A distributed photovoltaic combiner box protection device according to claim 5, characterized in that: The magnet (65) has a sealing plug (13) inside. The sealing plug (13) is cylindrical and has a connecting part at the top that is fixedly connected to the magnet (65).

7. A distributed photovoltaic combiner box protection device according to claim 6, characterized in that: The movable sleeve (8) includes a first collar (81) and a second collar (82). The first collar (81) and the second collar (82) slide relative to each other. A fourth spring (83) is provided between the first collar (81) and the second collar (82). The two ends of the fourth spring (83) are fixedly connected to the first collar (81) and the second collar (82) respectively.

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