Photovoltaic metal junction box

Abstract

The invention discloses a photovoltaic metal junction box, which relates to the photovoltaic field, including an outer shell and a top cover on the top thereof, an opening is provided on the top cover, one end of the outer shell is connected to an electric wire, the inner end of the outer shell is fixed with a female plug electrically connected to the electric wire, the outer shell is provided with a sandwich, the two ends of the outer shell are respectively connected with a water inlet pipe and a water outlet pipe, the water outlet pipe is connected to the sandwich, and the water inlet pipe and the sandwich are connected through a hose. The present invention arranges a set of water cooling structure in the sandwich inside the outer shell, and the water discharge volume of the water cooling structure can adapt to the temperature of the outer shell. When the temperature inside the outer shell is getting higher and higher, the water discharge volume will increase accordingly, and vice versa, the water discharge volume will decrease accordingly. The inner part of the outer shell is cooled by the water cooling structure, and when the fault temperature exceeds the threshold, water cooling alone is not enough at this time. The structure for controlling the water cooling water discharge volume will also link a set of circuit cutting structures, thereby cutting off the circuit to avoid dangerous situations such as fire and leakage.

Description

Technical Field

[0001] The invention relates to the field of photovoltaics, and in particular to a photovoltaic metal junction box. Background Art

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

[0003] The heating of photovoltaic metal junction boxes is an issue that requires attention, because it may cause problems such as power drop and voltage change, which need to be eliminated in time. The causes of heating of junction boxes may include line short circuit, line overheating, oxidation or shedding, leakage or explosion and other adverse phenomena.

[0004] The existing photovoltaic metal junction box only relies on the heat transfer of its own box body to dissipate heat, and has poor heat dissipation capacity. When a fault occurs and high temperature occurs, the heat in the box body cannot be taken away in time, which can easily accelerate the aging of internal components. Moreover, when the temperature is abnormal, the circuit cannot be cut off in time, which can easily cause a fire in the box body and cause a safety accident. Summary of the invention

[0005] Based on this, the purpose of the present invention is to provide a photovoltaic metal junction box to solve the technical problems that the existing photovoltaic metal junction box has unsatisfactory heat dissipation effect and cannot cut off the circuit in time when the temperature is abnormal, which is easy to cause fire.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a photovoltaic metal junction box, comprising an outer shell and a top cover on the top thereof, the top cover is provided with an opening, one end of the outer shell is connected to an electric wire, the inner end of the outer shell is fixed with a female plug electrically connected to the electric wire, the outer shell is provided with an interlayer, the two ends of the outer shell are respectively connected to a water inlet pipe and a water outlet pipe, the water outlet pipe is communicated with the interlayer, the water inlet pipe and the interlayer are communicated with each other through a hose, connecting plates are fixed on both sides of the hose inside the outer shell, a slide plate is slidably connected between the two connecting plates, and a first spring is connected between the end of the slide plate and the side wall of the outer shell, a hard air bag is also provided on the side of the inner shell away from the first spring, the air outlet of the air bag is connected to a piston telescopic rod, the output end of the piston telescopic rod is connected to the other end of the slide plate, the The hose moves through the middle opening of the skateboard. In the initial state, the skateboard cooperates with the connecting plate to squeeze and close the hose. A tooth plate is also fixed on the top of the skateboard. The interior of the shell is also rotatably connected to a tooth shaft meshing with the tooth plate through a connecting shaft. Two groups of support plates are slidably connected to the inner bottom of the shell. A connecting strip is fixed to one end of the support plate, and a tooth path meshing with the tooth shaft is provided on the connecting strip. Electrical terminals are supported on the tops of the two groups of support plates. The tops of the electrical terminals extend to be flush with the top of the opening. An extension plate is connected to the bottom of the electrical terminals, and the extension plate is located between the two groups of support plates. A sub-plug that cooperates with the female plug is fixed to one end of the extension plate, and the sub-plug is electrically connected to the electrical terminal. A second spring is connected between the bottom of the extension plate and the shell, and in the initial state, the second spring is in a stretched state.

[0007] By adopting the above technical solution, the inside of the shell can be cooled down, and the water displacement of the water cooling structure can adapt to the temperature of the shell. In addition, when the fault temperature exceeds the threshold, the structure controlling the water cooling displacement will also link a set of circuit cutting structures to cut off the circuit.

[0008] The present invention is further configured such that a limiting groove is provided at the bottom of the extension plate, and a limiting rod cooperating with the limiting groove is fixed to the inner bottom of the shell.

[0009] By adopting the above technical solution, the extension plate and the power terminal can be ensured to move smoothly.

[0010] The present invention is further configured such that a threaded connection column is provided on the top cover.

[0011] By adopting the above technical solution, the junction box is connected to the junction head on the back of the photovoltaic panel through the threaded connection column.

[0012] The present invention is further configured such that the plug and the sub-plug are cross-connected.

[0013] By adopting the above technical solution, it is convenient to disconnect the upper and lower parts from each other to achieve power off.

[0014] The present invention is further configured such that the hose is connected to the bottom end of the interlayer, and the water outlet pipe is connected to the top end of the interlayer.

[0015] By adopting the above technical solution, the water flow stays in the interlayer for a long time.

[0016] The present invention is further configured such that the outer shell and the top cover adopt a detachable connection structure, and the outer shell forms a seal on the interlayer.

[0017] By adopting the above technical solution, it is convenient to inspect and repair the internal components of the shell.

[0018] The present invention is further configured such that the travel distance of the piston telescopic rod is greater than the thickness of the support plate.

[0019] By adopting the above technical solution, it is ensured that the support plate can be completely staggered with the power terminals.

[0020] The present invention is further configured such that a slide rail is disposed at the inner bottom of the shell, a structure cooperating with the slide rail is disposed at the bottom of the support plate, and the support plate is slidably connected to the shell via the slide rail.

[0021] By adopting the above technical solution, the support plate can move smoothly.

[0022] In summary, the present invention mainly has the following beneficial effects:

[0023] The present invention arranges a water cooling structure in the inner layer of the shell, and the water displacement of the water cooling structure can adapt to the temperature of the shell. When the temperature inside the shell becomes higher and higher, the water displacement will increase accordingly, and vice versa. The inside of the shell is cooled by the water cooling structure. When a fault temperature exceeds a threshold, water cooling alone is not enough. The structure for controlling the water cooling displacement will also link a circuit cutting structure to cut off the circuit to avoid dangerous situations such as fire and leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0025] Figure 2 This is a schematic diagram of the structure of the present invention after removing the top cover;

[0026] Figure 3 is a cross-sectional view of the present invention;

[0027] Figure 4 It is a schematic diagram of the internal structure of the present invention;

[0028] Figure 5 For the present invention Figure 4Another perspective of the picture;

[0029] Figure 6 It is a schematic diagram of the structure of the housing of the present invention;

[0030] Figure 7 This is a schematic diagram of the transmission structure of the support plate of the present invention;

[0031] Figure 8 It is a schematic diagram of the structure of the power connection terminal and the extension plate of the present invention;

[0032] Fig. 9 For the present invention Figure 7 Another perspective of the picture.

[0033] In the figure: 1. shell; 2. top cover; 3. opening; 4. wires; 5. female plug; 6. interlayer; 7. water inlet pipe; 8. water outlet pipe; 9. hose; 10. connecting plate; 11. slide plate; 12. first spring; 13. air bag; 14. piston telescopic rod; 15. tooth plate; 16. connecting shaft; 17. gear shaft; 18. slide rail; 19. support plate; 20. connecting strip; 21. power terminal; 22. extension plate; 23. second spring; 24. limit rod; 25. limit groove; 26. sub-plug; 27. threaded connecting column. DETAILED DESCRIPTION

[0034] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0035] The following describes an embodiment of the present invention based on its overall structure.

[0036] A photovoltaic metal junction box, such as Figure 1-9 As shown: it includes a shell 1 and a top cover 2 on the top thereof, the top cover 2 is provided with an opening 3 and a threaded connection column 27, the shell 1 and the top cover 2 adopt a detachable connection structure, the power terminal 21 inside the shell 1 is located in the opening 3 and is flush with the upper end of the opening 3, when installing, the junction box is connected to the wiring device on the back of the photovoltaic panel through the threaded connection column 27, and the power terminal 21 is in contact with the power head of the photovoltaic panel for electrical connection.

[0037] The shell 1 is provided with an interlayer 6, and the shell 1 forms a seal with the interlayer 6. The two ends of the shell 1 are respectively connected with a water inlet pipe 7 and a water outlet pipe 8, the water outlet pipe 8 is communicated with the interlayer 6, and the water inlet pipe 7 and the interlayer 6 are communicated through a hose 9. Connecting plates 10 are fixed on both sides of the hose 9 inside the shell 1, and a slide plate 11 is slidably connected between the two connecting plates 10, and a first spring 12 is connected between the end of the slide plate 11 and the side wall of the shell 1. A hard airbag 13 is also provided on the side of the shell 1 away from the first spring 12, and the air outlet of the airbag 13 is connected with a piston telescopic rod 14, and the output end of the piston telescopic rod 14 is connected to the other end of the slide plate 11, and the hose 9 moves through the middle opening of the slide plate 11.

[0038] The external circulating water source is connected through the water inlet pipe 7 and the water outlet pipe 8. In the initial state, the slide plate 11 and the connecting plate 10 cooperate to squeeze and close the hose 9, and the water in the water inlet pipe 7 cannot enter the hose 9. When the temperature inside the shell 1 rises, the gas inside the airbag 13 is a thermal expansion medium. The gas inside the airbag 13 expands due to heat, and it will squeeze the inside of the piston telescopic rod 14, so that the piston telescopic rod 14 extends. The piston telescopic rod 14 squeezes and pushes the slide plate 11, and the slide plate 11 and the connecting plate 10 gradually stagger, and the squeezing of the hose 9 is gradually lost. The hose 9 is made of elastic material, and the hose 9 will gradually recover, and its internal channel will gradually open. The higher the temperature, the longer the piston telescopic rod 14 extends, the greater the misalignment between the slide plate 11 and the connecting plate 10, and the release of the hose 9 The more there are, the larger the channel in the hose 9 will be, until the hose 9 is completely restored, the larger the amount of water entering the interlayer 6 through the hose 9 will be, and then the water flow will be discharged and circulated through the outlet pipe 8, and the heat inside the shell 1 will be taken away by the heat exchange of the water flow. On the contrary, when the temperature drops, the piston telescopic rod 14 is recovered, and the first spring 12 rebounds, driving the slide plate 11 to reset, so as to continue to squeeze the hose 9 through the cooperation of the slide plate 11 and the connecting plate 10, and use the deformation of the hose 9 to reduce its internal water flow channel, here The amount of water can be adaptively adjusted according to the high and low changes in the internal temperature of the shell 1. The hose 9 is connected to the bottom end of the interlayer 6, and the outlet pipe 8 is connected to the high end of the interlayer 6, so that the water flow can stay in the interlayer 6 for a longer time.

[0039] On the basis of the above structure, the present invention is also connected to one end of the shell 1 with a wire 4, the inner end of the shell 1 is fixed with a female plug 5 electrically connected to the wire 4, the top of the slide plate 11 is also fixed with a tooth plate 15, the inside of the shell 1 is also rotatably connected with a tooth shaft 17 meshing with the tooth plate 15 through a connecting shaft 16, the inner bottom of the shell 1 is slidably connected with two groups of support plates 19, the inner bottom of the shell 1 is provided with a slide rail 18, the bottom of the support plate 19 is provided with a structure matching the slide rail 18, the support plate 19 is slidably connected to the shell 1 through the slide rail 18, one end of the support plate 19 is fixed with a connecting strip 20, and the connecting strip 20 is connected to the outer shell 1. The strip 20 is provided with teeth meshing with the gear shaft 17, the tops of the two groups of support plates 19 support the power terminals 21, the tops of the power terminals 21 extend to be flush with the top of the opening 3, the bottoms of the power terminals 21 are connected with extension plates 22, and the extension plates 22 are located between the two groups of support plates 19, one end of the extension plates 22 is fixed with a sub-plug 26 that matches the female plug 5, the female plug 5 is cross-connected with the sub-plug 26, and the sub-plug 26 is electrically connected to the power terminals 21, a second spring 23 is connected between the bottom of the extension plate 22 and the housing 1, and in the initial state, the second spring 23 is in a stretched state.

[0040] When the temperature inside the housing 1 rises, the piston telescopic rod 14 pushes the slide plate 11 to move, and at the same time, the tooth plate 15 is driven to move, the tooth plate 15 drives the gear shaft 17 to rotate, the gear shaft 17 drives the connecting strip 20 to move outward, and the connecting strip 20 drives the support plate 19 to move outward. When the temperature is within a reasonable range, the moving distance of the support plate 19 will not exceed its thickness, and the power terminal 21 will still be supported by the support plate 19. When the temperature is too high, the travel distance of the piston telescopic rod 14 is greater than the thickness of the support plate 19, and the moving distance of the support plate 19 will exceed Its thickness, the support plate 19 will lose the support of the connecting terminal 21, and the second spring 23 will reset and pull the extension plate 22 and the connecting terminal 21 downward, so that the connecting terminal 21 is separated from the connecting head of the photovoltaic panel. At the same time, the sub-plug 26 will also move downward with the extension plate 22, so that the sub-plug 26 is separated from the female plug 5, and the power is cut off at both ends. When resetting, it is manually repaired and reset. A limiting groove 25 is set at the bottom of the extension plate 22, and a limiting rod 24 cooperating with the limiting groove 25 is fixed to the inner bottom of the shell 1, so that the extension plate 22 can move smoothly.

[0041] Although an embodiment of the present invention has been shown and described, this specific embodiment is merely an explanation of the present invention and is not a limitation of the invention. The specific features, structures, materials or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. After reading this specification, those skilled in the art may make modifications, substitutions and variations to the embodiments without creative contributions as needed without departing from the principles and purpose of the present invention. However, as long as they are within the scope of the claims of the present invention, they are protected by patent law.

Claims

1. A photovoltaic metal junction box, comprising a housing (1) and a top cover (2) on the top thereof, characterized in that: The top cover (2) is provided with an opening (3), one end of the shell (1) is connected to an electric wire (4), the inner end of the shell (1) is fixed with a female plug (5) electrically connected to the electric wire (4), the shell (1) is provided with a sandwich (6), the two ends of the shell (1) are respectively connected to a water inlet pipe (7) and a water outlet pipe (8), the water outlet pipe (8) is connected to the sandwich (6), the water inlet pipe (7) and the sandwich (6) are connected through a hose (9), and connecting plates (10) are fixed on both sides of the hose (9) inside the shell (1), and the two connecting plates (10) are connected to each other. The plates (10) are slidably connected to a slide plate (11), and a first spring (12) is connected between the end of the slide plate (11) and the side wall of the housing (1). A hard air bag (13) is also arranged on a side of the housing (1) away from the first spring (12). The air outlet of the air bag (13) is connected to a piston telescopic rod (14), and the output end of the piston telescopic rod (14) is connected to the other end of the slide plate (11). The hose (9) movably passes through the middle opening of the slide plate (11). In the initial state, the slide plate (11) cooperates with the connecting plate (10) to align with the hose ( 9) forms an extrusion closure, a tooth plate (15) is also fixed on the top of the slide plate (11), and a tooth shaft (17) meshing with the tooth plate (15) is rotatably connected to the inside of the shell (1) through a connecting shaft (16), and two groups of support plates (19) are slidably connected to the inner bottom of the shell (1), and the travel distance of the piston telescopic rod (14) is greater than the thickness of the support plate (19), and a connecting strip (20) is fixed on one end of the support plate (19), and a tooth path meshing with the tooth shaft (17) is provided on the connecting strip (20), and the top support of the two groups of support plates (19) There is an electrical terminal (21), the top of the electrical terminal (21) extends to be flush with the top of the opening (3), the bottom of the electrical terminal (21) is connected to an extension plate (22), and the extension plate (22) is located between two groups of support plates (19), one end of the extension plate (22) is fixed with a sub-plug (26) that matches the female plug (5), and the sub-plug (26) is electrically connected to the electrical terminal (21), and a second spring (23) is connected between the bottom of the extension plate (22) and the housing (1), and in the initial state, the second spring (23) is in a stretched state.

2. A photovoltaic metal junction box according to claim 1, characterized in that: A limiting groove (25) is provided at the bottom of the extension plate (22), and a limiting rod (24) matching the limiting groove (25) is fixed to the inner bottom of the housing (1).

3. The photovoltaic metal junction box according to claim 1, characterized in that: The top cover (2) is provided with a threaded connection column (27).

4. The photovoltaic metal junction box according to claim 1, characterized in that: The female plug (5) and the female plug (26) are cross-jointed.

5. The photovoltaic metal junction box according to claim 1, characterized in that: The hose (9) is connected to the bottom end of the interlayer (6), and the water outlet pipe (8) is connected to the top end of the interlayer (6).

6. The photovoltaic metal junction box according to claim 1, characterized in that: The outer shell (1) and the top cover (2) adopt a detachable connection structure, and the outer shell (1) forms a seal with the interlayer (6).

7. The photovoltaic metal junction box according to claim 1, characterized in that: The inner bottom of the outer shell (1) is provided with a slide rail (18), the bottom of the support plate (19) is provided with a structure that cooperates with the slide rail (18), and the support plate (19) is slidably connected to the outer shell (1) via the slide rail (18).

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