A junction box structure for a photovoltaic device

Abstract

The utility model discloses a kind of special junction box structures of photovoltaic equipment, belong to photovoltaic equipment junction box field.The special junction box structure of photovoltaic equipment, including shell, terminal being arranged in shell interior, diode connected with terminal and cover plate being arranged in shell top, multiple threading holes are opened in shell side wall, the side of each threading hole is equipped with the sealing assembly for connecting cable;Sealing assembly includes the connector fixedly arranged in the outside of shell, the connecting pipe fixedly arranged in one end of connector, the connecting ring sleeved in the outside of connecting pipe, the sealing element being arranged in the inside of connector, multiple equidistance top rod fixedly arranged on connecting ring and multiple equidistance slot being opened in the inside of connecting pipe, connector is conical structure.The sealing structure formed by sealing element, connecting ring, screw cap and top rod can effectively prevent moisture, dust and other external pollutants from invading the inside of junction box through cable gap, and air bag type sealing element can adapt to different diameter cables, and the adaptability is strong.

Description

Technical Field

[0001] This utility model relates to the field of photovoltaic equipment junction boxes, and in particular to a special junction box structure for photovoltaic equipment. Background Technology

[0002] Photovoltaic junction boxes, as key connectors between solar cell modules and external circuits, conduct electrical energy generated by the solar cell modules through cables. Due to the specific applications of solar cells and their high cost, photovoltaic junction boxes must meet the usage requirements of solar cell modules.

[0003] Chinese patent discloses a photovoltaic panel junction box structure, application number 202322915898.2. This patent mainly includes a box body with a cover plate at the top. A through groove is formed on the rear side of the lower wall of the box body. Three pads are sequentially arranged on the front side of the lower wall of the box body. Each of the three pads has a wiring plate at its upper end. A fixed connection position is provided at the rear end of the wiring plate. A bending clamping section is provided at the front end of the wiring plate. A through hole is formed in the middle of the bend of the bending clamping section, and a guide groove is provided at the front end of the through hole. A clamping pad is provided on the lower surface of the cover plate at a position corresponding to the bending clamping section, with the lower end of the clamping pad abutting against the upper end of the bending clamping section. A sealing end is provided in the middle of the front wall of the box body. This patent replaces the method of fixing wires by pressing with bolts, making the operation simpler and improving wiring efficiency.

[0004] However, the conduit inside the sealed end allows external cables to enter the box through it. When the cable is inserted into the conduit, a gap exists between the outer wall of the cable and the inner wall of the conduit, and there is a lack of a tight fit. External moisture and dust can easily seep into the box through these gaps, accumulating over time and affecting the safe operation of the internal system. Furthermore, when using conduits with fixed apertures for smaller cables, the gap problem becomes even more pronounced. Utility Model Content

[0005] This utility model provides a special junction box structure for photovoltaic equipment, which can solve the problem that there is a gap between the outer wall of the cable and the inner wall of the conduit in the existing special junction box structure for photovoltaic equipment, and the lack of a tight fit structure. External moisture, dust and other substances can easily seep into the box through the gap, which will affect the safe operation of the internal system of the junction box in the long term.

[0006] A junction box structure for photovoltaic equipment includes a housing, terminals disposed inside the housing, diodes for connecting the terminals, and a cover plate disposed on the top of the housing. Multiple wire-passing holes are provided on the side wall of the housing, and a sealing component for connecting cables is provided on one side of each wire-passing hole. The sealing assembly includes a connector fixed to the outside of the housing, a connecting tube fixed to one end of the connector, a connecting ring sleeved on the outside of the connecting tube, a sealing element disposed on the inside of the connector, a plurality of push rods equidistantly fixed on the connecting ring, and a plurality of slots equidistantly opened inside the connecting tube. The connector has a conical structure, the sealing element is an airbag sealing ring structure and fills the space between the connector and the cable, and the push rods are inserted into the slots. The sealing assembly further includes a positioning component, which is used to fix the position of the connecting ring on the connecting pipe and to make the push rod contact the seal.

[0007] Preferably, the positioning component includes a cap located on one side of the connecting ring, the outer surface of the connecting tube is threaded, and the cap is threadedly connected to the connecting tube.

[0008] Preferably, both the bottom of the cover plate and the top of the housing are provided with glue storage tanks, and the glue storage tanks are filled with sealing glue.

[0009] Preferably, a heat-conducting plate is attached to the inner side of the housing and below the terminal. The heat-conducting plate is designed as an L-shape and fixed to the housing. One side of the vertical section of the heat-conducting plate extends to the outer side of the housing. An adhesive plate for attaching to the diode is fixed on the heat-conducting plate.

[0010] Preferably, thermally conductive pads are provided between the bonding plate and the diode, and between the thermally conductive plate and the terminal.

[0011] Preferably, a plurality of heat dissipation fins extending to the outer side of the housing are fixed at equal intervals on one side of the heat-conducting plate, and the surface of each heat dissipation fin is provided with a wave structure.

[0012] Preferably, a sealing gasket is provided between the housing and the cover plate, and the cover plate is detachably installed on the top of the housing.

[0013] Preferably, the seal is made of silicone, and the surface of the seal is uniformly provided with multiple protrusions.

[0014] Preferably, the housing, cover plate, connector, connecting tube, screw cap, and connecting ring are all made of polyphenylene oxide.

[0015] Preferably, the surfaces of the housing, cover plate, connector, connecting tube, screw cap and connecting ring are all provided with an ultraviolet-protective coating.

[0016] This utility model provides a dedicated junction box structure for photovoltaic equipment, which has the following advantages: 1. The seal, connecting ring, and cap are fitted onto the cable. Tightening the cap causes the connecting ring to move the push rod inward. The seal, an airbag structure, deforms under pressure from the push rod, expanding to tightly enclose the cable and achieving a reliable seal at the cable-connector joint, ensuring waterproof and dustproof performance. This sealing structure effectively prevents moisture, dust, and other external contaminants from entering the junction box through cable gaps, ensuring long-term electrical stability and better suitability for photovoltaic power generation systems in harsh outdoor environments. Furthermore, the airbag seal can adapt to cables of different diameters, automatically adjusting its deformation under uniform pressure from the push rod to ensure a full fit with the cable surface, demonstrating strong adaptability.

[0017] 2. The terminals are tightly bonded to the heat-conducting plate, and the diodes are tightly bonded to the bonding plate. The heat generated by the diodes and terminals is transferred to the heat dissipation fins through the heat-conducting plate. The heat dissipation fins dissipate the heat by contacting the external space, so that the junction box has good heat dissipation performance and ensures the normal operation of the junction box. Attached Figure Description

[0018] Figure 1 A schematic diagram of a junction box structure for photovoltaic equipment provided by this utility model. Figure 1 ; Figure 2 A schematic diagram of a junction box structure for photovoltaic equipment provided by this utility model. Figure 2 ; Figure 3 A schematic diagram of the sealing gasket, sealing adhesive, and adhesive storage layer structure of a photovoltaic equipment junction box provided by this utility model; Figure 4 A schematic diagram of the heat-conducting plate, heat dissipation fins, heat-conducting pad, and bonding plate structure of a special junction box for photovoltaic equipment provided by this utility model; Figure 5 A schematic diagram of a sealing component structure for a photovoltaic equipment junction box provided by this utility model; Figure 6 This utility model provides a special junction box structure for photovoltaic equipment. Figure 5 Explosion structure diagram; Figure 7 This utility model provides a schematic diagram of the internal structure of a junction box for photovoltaic equipment.

[0019] Explanation of reference numerals in the attached figures: 1. Housing; 2. Connector; 3. Connecting tube; 4. Screw cap; 5. Connecting ring; 6. Slot; 7. Top rod; 8. Seal; 9. Terminal; 10. Adhesive plate; 11. Diode; 12. Heat-conducting plate; 13. Heat dissipation fins; 14. Thermal pad; 15. Cover plate; 16. Adhesive reservoir; 17. Sealing gasket; 18. Sealing adhesive. Detailed Implementation

[0020] The specific embodiments of this utility model are described in detail below, but it should be understood that the scope of protection of this utility model is not limited to the specific embodiments.

[0021] like Figures 1 to 7 As shown in the figure, this utility model provides a special junction box structure for photovoltaic equipment, including a housing 1, terminals 9 disposed inside the housing 1, diodes 11 connected to the terminals 9, and a cover plate 15 disposed on the top of the housing 1. Multiple wire-passing holes are provided on the side wall of the housing 1, and a sealing assembly for connecting cables is provided on one side of each wire-passing hole to achieve a waterproof and sealed connection of the cables. The sealing assembly includes a connector 2 fixed to the outside of the housing 1, a connecting tube 3 fixed to one end of the connector 2, a connecting ring 5 sleeved on the outside of the connecting tube 3, a sealing element 8 disposed inside the connector 2, multiple top rods 7 equidistantly fixed on the connecting ring 5, multiple slots 6 equidistantly opened inside the connecting tube 3, and a positioning assembly. The connector 2 has a conical structure, the sealing element 8 is an airbag sealing ring structure and fills the space between the connector 2 and the cable, and the top rods 7 are inserted into the slots 6. The positioning assembly is used to fix the position of the connecting ring 5 on the connecting tube 3 and to make the top rods 7 contact the sealing element 8.

[0022] The sealing element 8 and connecting ring 5 are first fitted onto the cable. The cable passes through the connector 2 and the wire hole, then extends into the housing 1 for subsequent wiring. The cable engages with the clamping part (two clamping plates pressed together) on the terminal 9 for a stable connection. Moving the connecting ring 5 causes the push rod 7 to insert into the slot 6 and move along the slot 6, while the sealing element 8 moves synchronously into the connector 2. The positioning component controls the movement of the connecting ring 5, causing the push rod 7 on the connecting ring 5 to press against the sealing element 8. The sealing element 8 is an airbag structure that deforms under the pressure of the push rod 7, thereby filling the gap between the cable and the connector 2, forming a sealing barrier to ensure waterproof and dustproof performance.

[0023] The sealing structure, which works in conjunction with the sealing element 8, connecting ring 5, and top rod 7, effectively prevents external contaminants such as moisture and dust from entering the junction box through gaps in the cable, ensuring the long-term stability of the electrical connection and making it better suited for photovoltaic power generation systems in harsh outdoor environments. Furthermore, the airbag-type sealing element 8 can adapt to cables of different diameters, automatically adjusting its deformation under the uniform pressure of the top rod 7 to ensure full contact with the cable surface, demonstrating strong adaptability.

[0024] In some specific implementation plans, such as Figure 5 and Figure 6 As shown, the positioning component includes a cap 4 located on one side of the connecting ring 5, and the outer surface of the connecting tube 3 is threaded, with the cap 4 threadedly connected to the connecting tube 3.

[0025] The positioning component causes the top rod 7 to press against the seal 8. After the cap 4 is threadedly connected to the connecting pipe 3, when the cap 4 is tightened, the connecting ring 5 drives the top rod 7 to move inward, causing the seal 8 to expand under pressure, thereby tightly wrapping the cable and achieving a reliable seal at the connection between the cable and the connector 2.

[0026] In some specific implementation plans, such as Figure 1 , Figure 2 and Figure 3 As shown, both the bottom of the cover plate 15 and the top of the housing 1 are provided with adhesive storage tanks 16. Small grooves are provided on the inner wall of the adhesive storage tanks 16 to better contact the sealing adhesive 18. The adhesive storage tanks 16 are filled with sealing adhesive 18, which is a curing sealant. A sealing gasket 17 is provided between the housing 1 and the cover plate 15. The cover plate 15 is detachably installed on the top of the housing 1, preferably using bolt fastening, which is convenient for disassembly and assembly and provides a stable connection.

[0027] The cover plate 15 and the housing 1 form an initial seal through the sealing gasket 17. Then, the sealant is filled into the glue storage tank 16 and cured to form the sealing glue 18, which serves as a second sealing barrier to achieve a good sealing effect for the junction box and ensure that the junction box seal is effective for a long time.

[0028] In some specific implementation plans, such as Figure 2 , Figure 4 and Figure 7 As shown, a heat-conducting plate 12 is attached to the inner side of the housing 1 and below the terminal 9. The heat-conducting plate 12 has an L-shaped structure and is fixed to the housing 1. One side of the vertical section of the heat-conducting plate 12 extends to the outer side of the housing 1. A bonding plate 10 for bonding with the diode 11 is fixed on the heat-conducting plate 12. Thermally conductive pads 14 are provided between the bonding plate 10 and the diode 11, and between the heat-conducting plate 12 and the terminal 9, to achieve sufficient contact and increase heat dissipation. Multiple heat dissipation fins 13 extending to the outer side of the housing 1 are fixed at equal intervals on one side of the heat-conducting plate 12. A mounting slot is opened inside the housing 1, and the heat-conducting plate 12 is embedded in the mounting slot, so that the heat dissipation fins 13 are located outside the housing 1. The surface of each heat dissipation fin 13 is designed with a wave structure to increase the heat dissipation area and improve heat dissipation performance.

[0029] When terminal 9 is installed inside housing 1, it is in close contact with heat-conducting plate 12, and diode 11 is in close contact with bonding plate 10. Diode 11 generates heat when conducting; additionally, heat is generated due to the contact resistance between diode 11 and terminal 9. The sealing gasket 17 and diode 11 inside the junction box are susceptible to high temperatures, accelerating the aging of sealing gasket 17 and affecting the junction box's sealing performance as well as the normal operation of diode 11. The heat generated by diode 11 and terminal 9 is transferred to heat dissipation fins 13 through heat-conducting plate 12. Heat dissipation fins 13, in contact with the external space, dissipate the heat, giving the junction box good heat dissipation performance and ensuring its normal operation.

[0030] In some specific implementations, the seal 8 is made of silicone, and its surface is uniformly provided with multiple raised sections to enhance sealing performance. The housing 1, cover plate 15, connector 2, connecting pipe 3, screw cap 4, and connecting ring 5 are all made of polyphenylene oxide (PPO) and have a UV-protective coating on their surfaces. Currently, PPO plastic has excellent weather resistance, and the UV-protective coating further enhances its weather resistance and anti-aging capabilities to cope with the harsh environments of high-altitude areas such as plateaus.

[0031] To facilitate understanding of the embodiments of this solution by those skilled in the art, the working principle of this solution will now be briefly explained in conjunction with specific application scenarios: Terminal 9 is installed inside the housing 1 and is tightly attached to the heat-conducting plate 12. Diode 11 is tightly attached to the bonding plate 10. Diode 11 generates heat when it is conducting. Additionally, heat is also generated due to the contact resistance between diode 11 and terminal 9. The heat generated by diode 11 and terminal 9 is transferred to the heat dissipation fins 13 through the heat-conducting plate 12. The heat dissipation fins 13 dissipate the heat by contacting the external space, thus providing the junction box with good heat dissipation performance and ensuring its normal operation.

[0032] First, the seal 8, connecting ring 5, and screw cap 4 are fitted onto the cable. The cable passes through the connector 2 and the wire hole and extends into the housing 1 for subsequent wiring. Moving the connecting ring 5 causes the push rod 7 to insert into the slot 6 and move along the slot 6, while the seal 8 moves synchronously into the connector 2.

[0033] Tighten the cap 4, and the connecting ring 5 will drive the top rod 7 to move inward. The sealing element 8 is an airbag structure. Under the pressure of the top rod 7, it will deform and expand to tightly wrap the cable, achieving a reliable seal at the connection between the cable and the connector 2, ensuring waterproof and dustproof effect.

[0034] The above-disclosed embodiments are only a few specific examples of the present utility model. However, the embodiments of the present utility model are not limited thereto. Any changes that can be conceived by those skilled in the art should fall within the protection scope of the present utility model.

Claims

1. A junction box structure for photovoltaic equipment, comprising a housing (1), terminals (9) disposed inside the housing (1), diodes (11) connecting the terminals (9), and a cover plate (15) disposed on the top of the housing (1), wherein a plurality of wire-passing holes are provided on the side wall of the housing (1), characterized in that, Each of the aforementioned wire holes has a sealing component on one side for connecting cables; The sealing assembly includes a connector (2) fixed to the outside of the housing (1), a connecting tube (3) fixed to one end of the connector (2), a connecting ring (5) sleeved on the outside of the connecting tube (3), a sealing element (8) provided on the inside of the connector (2), a plurality of push rods (7) fixed at equal intervals on the connecting ring (5), and a plurality of slots (6) opened at equal intervals inside the connecting tube (3). The connector (2) has a conical structure, the sealing element (8) has an airbag sealing ring structure and is filled between the connector (2) and the cable, and the push rods (7) are inserted into the slots (6). The sealing assembly further includes a positioning assembly for fixing the position of the connecting ring (5) on the connecting tube (3) and causing the push rod (7) to contact the seal (8).

2. The structure of a dedicated junction box for photovoltaic equipment as described in claim 1, characterized in that, The positioning component includes a cap (4) located on one side of the connecting ring (5), and the outer surface of the connecting tube (3) is threaded, with the cap (4) threadedly connected to the connecting tube (3).

3. The structure of a dedicated junction box for photovoltaic equipment as described in claim 2, characterized in that, The bottom of the cover plate (15) and the top of the shell (1) are provided with glue storage tanks (16), and the glue storage tanks (16) are filled with sealing glue (18).

4. The structure of a dedicated junction box for photovoltaic equipment as described in claim 1, characterized in that, A heat-conducting plate (12) is attached to the inner side of the housing (1) and below the terminal (9). The heat-conducting plate (12) is designed as an L-shaped structure and is fixed on the housing (1). One side of the vertical section of the heat-conducting plate (12) extends to the outer side of the housing (1). A bonding plate (10) that is attached to the diode (11) is fixed on the heat-conducting plate (12).

5. The structure of a dedicated junction box for photovoltaic equipment as described in claim 4, characterized in that, Thermal pads (14) are provided between the bonding plate (10) and the diode (11) and between the heat-conducting plate (12) and the terminal (9).

6. The structure of a dedicated junction box for photovoltaic equipment as described in claim 5, characterized in that, The heat-conducting plate (12) has multiple heat dissipation fins (13) that extend to the outside of the shell (1) at equal intervals on one side, and the surface of each heat dissipation fin (13) is designed with a wave structure.

7. The structure of a dedicated junction box for photovoltaic equipment as described in claim 3, characterized in that, A sealing gasket (17) is provided between the housing (1) and the cover plate (15), and the cover plate (15) is detachably installed on the top of the housing (1).

8. The structure of a dedicated junction box for photovoltaic equipment as described in claim 7, characterized in that, The sealing element (8) is made of silicone, and the surface of the sealing element (8) is uniformly provided with multiple protrusions.

9. The structure of a dedicated junction box for photovoltaic equipment as described in claim 8, characterized in that, The shell (1), cover plate (15), connector (2), connecting pipe (3), screw cap (4) and connecting ring (5) are all made of polyphenylene ether.

10. The structure of a dedicated junction box for photovoltaic equipment as described in claim 9, characterized in that, The surfaces of the housing (1), cover plate (15), connector (2), connecting pipe (3), screw cap (4) and connecting ring (5) are all provided with ultraviolet protection coating.

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