Junction box, inverter and photovoltaic system

Abstract

The utility model discloses a junction box, an inverter and a photovoltaic system, and belongs to the field of power electronics. The junction box comprises a box body and a cable, wherein a wiring terminal is arranged in the box body; the cable comprises a cable core group and a bunching sleeve, the cable core group comprises a first part and a second part which are connected, one end, deviating from the second part, of the first part extends into the box body and is connected with the wiring terminal, and the plurality of second parts of the cable core group are located outside the box body and at least partially located in the bunching sleeve. The distribution points of the cables are arranged outside the junction box, so that the space size of the junction box can be reduced, the transverse shearing force borne by the binding posts is reduced, and the wiring terminals are protected to a certain extent.

Description

Technical Field

[0001] The present application belongs to the field of power electronics and photovoltaic technology, and in particular relates to a junction box, an inverter and a photovoltaic system. Background Art

[0002] An AC junction box is usually installed on the AC side of the inverter. The AC cable enters the AC junction box through a wire feeder plate. The multiple single-core wires in the AC cable are connected to the terminal blocks in the AC junction box. Due to the limited internal space of the AC junction box, there are risks such as difficulty in wiring, high risk of deformation of the terminal blocks due to pulling, and poor reliability in the later stage. Therefore, it needs to be improved. Utility Model Content

[0003] The present application aims to solve at least one of the technical problems existing in the prior art. To this end, the present application proposes a junction box, an inverter, and a photovoltaic system that can reduce the spatial dimensions of the junction box, reduce the lateral shear force on the terminal posts, and provide a certain degree of protection for the terminal posts.

[0004] In a first aspect, the present application provides a junction box for use in a photovoltaic system, comprising:

[0005] A box body, wherein the box body is provided with a connection terminal;

[0006] A cable, the cable comprising a core group and a cable sleeve, the core group comprising a first part and a second part connected to each other, the end of the first part facing away from the second part extending into the box body and connected to the terminal, the multiple second parts of the core group being located outside the box body and at least partially located inside the cable sleeve.

[0007] According to the junction box of the present application, by setting the cable distribution point outside the junction box, the cables can be directly distributed outside the box body of the junction box, and the multiple single-core wires after distribution extend into the box body and are electrically connected one-to-one with the multiple terminal posts of the terminal. Compared with the wiring method of distributing cables inside the box body, on the one hand, the cable distribution can be carried out at a distance, the single-core wire has higher flexibility on the wiring side, and the operation is relatively easy and convenient; on the other hand, the junction box is extremely simplified and only needs to accommodate the terminal posts, the space size of the box body is greatly reduced, and consumables are reduced; on the third hand, the wire threading holes on the box body can be set corresponding to the terminal posts of the terminal posts in the height direction, and the single-core wire can enter the wire threading holes vertically, reducing the deflection angle of the single-core wire and the lateral shear force on the terminal posts, thereby playing a certain protective role on the terminal posts.

[0008] According to one embodiment of the present application, the box body includes a main body and a threading plate, the main body is provided with a notch, and the threading plate is arranged in the notch to enclose an accommodating cavity for accommodating the terminal;

[0009] The threading plate is provided with threading holes, and the threading holes are used for the wire core group to pass through.

[0010] According to one embodiment of the present application, the box body includes a main body and a cover body, and the cover body is connected to the main body via a quick-release structure.

[0011] According to one embodiment of the present application, one of the body and the cover is provided with a first clamping portion, and the other of the body and the cover is provided with a second clamping portion clamped with the first clamping portion;

[0012] Alternatively, the box body further includes a magnetic member, the magnetic member including an attracting portion and a third clamping portion, the attracting portion is provided on one side of the third clamping portion and protrudes from the third clamping portion, the top end of the attracting portion is attracted to the cover body, a first gap is formed between the top end of the third clamping portion and the cover body, and at least a portion of the body is located in the first gap;

[0013] Alternatively, the box body also includes a turn buckle, which includes a first connecting part and a second connecting part, the first connecting part is arranged on one side of the second connecting part and protrudes from the second connecting part, the first connecting part is rotatably connected to the cover body, and a second gap is formed between the cover body and the second connecting part, and at least part of the main body is located in the second gap.

[0014] According to one embodiment of the present application, the junction box further includes: a protective cover with two open ends, one end of the protective cover is connected to the box body, the other end of the protective cover extends toward the cable sleeve, and the portion of the first part located outside the box body is located inside the protective cover.

[0015] According to one embodiment of the present application, the protective cover is a telescopic tube, and one end of the telescopic tube facing away from the box body can move in a direction away from the box body and in a direction close to the box body.

[0016] According to one embodiment of the present application, the telescopic tube is a multi-section sleeve, which is sequentially sleeved from the inside to the outside, and the end of the multi-section sleeve away from the box body can move in a direction away from the box body and in a direction close to the box body.

[0017] According to an embodiment of the present application, the telescopic tube is a corrugated telescopic tube, and one end of the corrugated telescopic tube away from the box body can move in a direction away from the box body and in a direction close to the box body.

[0018] According to one embodiment of the present application, the junction box further includes: an adapter, which is located in the box body, one end of the adapter is connected to the wiring terminal, and the other end of the adapter is connected to an end of the first part facing away from the second part.

[0019] According to one embodiment of the present application, the wire core group includes multiple first parts, the adapters include multiple, and one end of the multiple first parts is connected to one end of the multiple adapters in a one-to-one correspondence.

[0020] According to one embodiment of the present application, the wire core group includes multiple first parts, the adapter includes a connecting part and multiple first terminals and multiple second terminals respectively arranged on both sides of the connecting part, the multiple first terminals are connected one-to-one with the terminals of the terminal block, and the multiple second terminals are connected one-to-one with the multiple first parts.

[0021] In a second aspect, the present application provides an inverter, comprising: a junction box as described in any one of the above.

[0022] According to the inverter of the present application, by setting up a junction box, the cable distribution point can be set outside the junction box, and the cables can be directly distributed outside the box body. The multiple single-core wires after distribution extend into the box body and are electrically connected one-to-one with the multiple terminal posts of the terminal. Compared with the wiring method of distributing cables inside the box body, on the one hand, the cable distribution can be carried out at a distance, the single-core wire has higher flexibility on the wiring side, and the operation is relatively easy and convenient; on the other hand, the junction box is extremely simplified and only needs to accommodate the terminal posts. The space size of the box body is greatly reduced, and consumables are reduced; on the third hand, the wire threading holes on the box body can be set corresponding to the terminal posts of the terminal posts in the height direction, and the single-core wire can enter the wire threading holes vertically, reducing the deflection angle of the single-core wire and reducing the lateral shear force on the terminal posts, thereby playing a certain protective role on the terminal posts.

[0023] In a third aspect, the present application provides a photovoltaic system, which includes the inverter described above.

[0024] According to the photovoltaic system of the present application, by setting up an inverter, the inverter includes a junction box, and the cable distribution point can be set outside the junction box. The cables can be directly distributed outside the box body of the junction box. The multiple single-core wires after distribution extend into the box body and are electrically connected one-to-one with the multiple terminal posts of the terminal. Compared with the wiring method of distributing cables inside the box body, on the one hand, the cable distribution can be carried out at a distance, the single-core wire has higher flexibility on the wiring side, and the operation is relatively easy and convenient; on the second hand, the junction box is extremely simplified and only needs to accommodate the terminal posts. The space size of the box body is greatly reduced, and consumables are reduced; on the third hand, the wire threading holes on the box body can be set corresponding to the terminal posts of the terminal posts in the height direction, and the single-core wire can enter the wire threading holes vertically, reducing the deflection angle of the single-core wire and reducing the lateral shear force on the terminal posts, thereby playing a certain protective role on the terminal posts.

[0025] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become obvious from the description below, or will be learned through practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0027] Figure 1 This is one of the structural diagrams of the junction box provided in the embodiment of the present application;

[0028] Figure 2 This is one of the structural diagrams of the box body provided in the embodiment of the present application;

[0029] Figure 3 This is the second structural diagram of the box body provided in the embodiment of the present application;

[0030] Figure 4 This is the third structural diagram of the box body provided in the embodiment of the present application;

[0031] Figure 5 This is the second structural diagram of the junction box provided in the embodiment of the present application;

[0032] Figure 6 yes Figure 5 A partial schematic diagram of

[0033] Figure 7 This is the third structural diagram of the junction box provided in the embodiment of the present application;

[0034] Figure 8 This is a schematic structural diagram of a magnetic attraction component according to an embodiment of the present application;

[0035] Figure 9 This is the fourth structural diagram of the junction box provided in the embodiment of the present application;

[0036] Figure 10 This is a schematic structural diagram of a turn buckle according to an embodiment of the present application;

[0037] Figure 11 This is the fifth structural diagram of the junction box provided in the embodiment of the present application;

[0038] Figure 12 This is the sixth structural diagram of the junction box provided in the embodiment of the present application;

[0039] Figure 13 This is the seventh structural diagram of the junction box provided in the embodiment of the present application;

[0040] Figure 14 This is the eighth structural diagram of the junction box provided in the embodiment of the present application;

[0041] Figure 15 This is one of the structural diagrams of the adapter provided in the embodiment of the present application;

[0042] Figure 16 This is the ninth structural diagram of the junction box provided in the embodiment of the present application;

[0043] Figure 17 This is the second structural diagram of the adapter provided in the embodiment of the present application.

[0044] Reference numerals:

[0045] Box body 1, terminal block 11, terminal post 111, body 12, notch 121, threading plate 13, threading hole 131, cover 14, first clamping portion 151, second clamping portion 152, magnetic element 16, suction portion 161, third clamping portion 162, buckle 17, first connecting portion 171, second connecting portion 172, sleeve 181, corrugated expansion tube 182, adapter 191, connector 1911, first terminal end 1912, second terminal end 1913;

[0046] Cable 2, core group 21, first part 211, second part 212, cable sleeve 22. DETAILED DESCRIPTION

[0047] The following describes in detail embodiments of the present application. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application and are not to be construed as limiting the present application.

[0048] Reference below Figures 1-17 A junction box, an inverter, and a photovoltaic system according to embodiments of the present application are described.

[0049] The junction box can be used for the wiring side of electronic equipment. The cables 2 enter the AC junction box through the wire guide plate 13 and are connected to the terminals 111 of the AC wiring terminals. The electrical equipment can be a doubly-fed converter, inverter, ring main unit, or control cabinet.

[0050] like Figure 1 and Figure 2 As shown, the junction box of the embodiment of the present application is applied to a photovoltaic system, including: a box body 1 and a cable 2; a terminal block 11 is provided in the box body 1; the cable 2 includes a core group 21 and a cable sleeve 22, the core group 21 includes a first part 211 and a second part 212 connected to each other, and the end of the first part 211 away from the second part 212 extends into the box body 1 and is connected to the terminal block 11, and multiple second parts 212 of the core group 21 are located outside the box body 1 and at least partially located in the cable sleeve 22.

[0051] The box body 1 is the main body of the junction box, and a space is formed inside the box body 1 to accommodate the connection terminals 11. These connection terminals 11 are used to connect electronic components in electronic devices such as inverters to ensure the transmission and distribution of electrical energy.

[0052] like Figure 1 As shown, the cable 2 includes a core group 21 and a cable sleeve 22. The core group 21 includes one or more single-core wires. One end of the core group 21 is electrically connected to the terminal 111 of the terminal block 11 in the box body 1. The second part 212 of the core group 21 is located outside the box body 1 for electrical connection to an external device.

[0053] like Figure 1 and Figure 12 As shown, the cable sleeve 22 is used to fix and protect the wire core group 21. All or part of the second part 212 can be located in the cable sleeve 22 to fix and protect the multiple second parts 212.

[0054] The connection point between the first portion 211 and the second portion 212 is the branching point of the cable 2, which is located outside the junction box or within the wiring board 13 of the junction box. In this embodiment, the operator branches the cable 2 into independent single-core wires outside the junction box. These multiple independent single-core wires extend into the box body 1 and are electrically connected to the multiple terminals 111 of the terminal block 11 in a one-to-one correspondence.

[0055] In the related art, an AC junction box is usually provided on the AC side of the inverter. Currently, the entire AC cable passes through the threading plate and enters the junction box. The entire AC cable is divided inside the junction box, and the independent single-core wires after division are connected to the terminals 111 of the terminal blocks. In the above-mentioned wiring method, due to the small internal space of the junction box, the short lateral distance of the junction box makes it difficult to put down the palm when manually dividing the cables, and the short longitudinal distance causes the angle of the divided cables to be too large, and the risk of the terminals 111 being pulled and deformed is very high. In order to provide a spacious position for the hands during manual operation and to make the angle of the single-core wire division connected to the corresponding terminal 111 as gentle as possible to reduce the situation where the terminal 111 is torn due to excessive shear force, the junction box body is usually set to a large size. The large-sized box body takes up a large space and the economic cost is too high.

[0056] According to the junction box provided in the embodiment of the present application, by setting the distribution point of the cable 2 outside the junction box, the cable 2 can be directly distributed outside the box body 1 of the junction box, and the multiple single-core wires after distribution extend into the box body 1 and are electrically connected one-to-one with the multiple terminal posts 111 of the terminal 11. Compared with the wiring method of distributing the cable 2 inside the box body 1, on the one hand, the distribution of the cable 2 can be carried out outside the box body 1, and the flexibility of the single-core wire on the wiring side is higher, and the operation is relatively easy and convenient; on the other hand, the junction box is extremely simplified and only needs to accommodate the terminal 11, and the spatial size of the box body 1 is greatly reduced, reducing consumables; on the third hand, the wire threading hole 131 on the box body 1 can be set to correspond to the terminal post 111 of the terminal 11 in the height direction, and the single-core wire can vertically enter the wire threading hole 131, thereby reducing the deflection angle of the single-core wire and the lateral shear force on the terminal post 111, thereby playing a certain protective role for the terminal 11.

[0057] The cable 2 may be a three-core cable 2 or a multi-core cable 2 .

[0058] In some embodiments, as Figure 2 、 Figure 3 and Figure 4 As shown, the box body 1 includes a main body 12 and a threading plate 13. The main body 12 is provided with a notch 121. The threading plate 13 is arranged in the notch 121 to enclose an accommodating cavity for accommodating the terminal 11. The threading plate 13 is provided with a threading hole 131, which is used for the wire core group 21 to pass through.

[0059] The threading plate 13 and the notch 121 of the body 12 can be connected by means of plug-in connection, snap connection or threaded connection.

[0060] For example, the end of the notch 121 may be a straight edge, a beveled edge, a trapezoid or a sawtooth shape, and the outer end of the threading plate 13 is in a shape that matches the end of the notch 121 .

[0061] The threading plate 13 is provided with threading holes 131 for passing single-core wires. The position, number and aperture of the threading holes 131 are adapted to the position of the terminal 11 and the number and outer diameter of the single-core wires.

[0062] For example, Figure 3 As shown, in the case where there are 6 single-core wires, at least 6 threading holes 131 are provided. The threading holes 131 are interference-fitted with the single-core wires to fix the single-core wires and seal the box body 1 .

[0063] like Figure 4 As shown, when the cables 2 do not need to be divided, the position, number and diameter of the threading holes 131 are adapted to the number and outer diameter of the cables 2. For example, the cables 2 include two, which are inserted side by side into the threading plate 13, and the threading holes 131 are arranged side by side, and the number of threading holes 131 is two.

[0064] In some embodiments, the threading plate 13 may be a sealed threading plate, for example, at least the area of ​​the threading plate 13 in contact with the electrical core wire is set as a rubber part or a plastic part, so as to fix the single core wire and seal the box body 1 through extrusion deformation.

[0065] In some embodiments, as Figure 5 、 Figure 7 and Figure 9 As shown, the box body 1 includes a main body 12 and a cover body 14, and the cover body 14 is connected to the main body 12 through a quick-release structure. The quick-release structure can be at least one connection method such as a snap connection, a hinge connection, a buckle connection, a magnetic connection and a pin connection.

[0066] In the related art, the main body and the cover are connected by screws. Even a slight deformation will cause the hole position to be misaligned, and faults such as thread slippage often occur.

[0067] In this embodiment, the screw fastening method between the main body 12 and the cover body 14 is eliminated, and a quick-release structure is adopted for connection, which can be disassembled without tools, greatly improving the convenience of operation and maintenance efficiency.

[0068] The quick-release structure may be in at least one of the following structural forms:

[0069] In the first embodiment, Figure 5 and Figure 6 As shown, the cover 14 is connected to the body 12 by snap fastening.

[0070] One of the body 12 and the cover 14 is provided with a first engaging portion 151 , and the other of the body 12 and the cover 14 is provided with a second engaging portion 152 engaged with the first engaging portion 151 .

[0071] In this embodiment, the first clamping portion 151 and the second clamping portion 152 connect and separate the cover 14 and the body 12 by engaging and releasing the buckle, which is easy to operate and can achieve rapid installation and removal of the cover 14 and the body 12.

[0072] Among them, such as Figure 5 As shown, a plurality of first clamping portions 151 can be provided around the circumference of the box body 1 , and a plurality of second clamping portions 152 can be provided to increase the reliability of the connection between the cover 14 and the body 12 .

[0073] One of the first clamping portion 151 and the second clamping portion 152 can be a buckle, and the other of the first clamping portion 151 and the second clamping portion 152 can be a buckle groove. The connection is achieved by the cooperation between the buckle and the buckle groove, which has the advantages of firm connection and easy installation and disassembly.

[0074] In the second embodiment, Figure 7 and Figure 8 As shown, the box body 1 also includes a magnetic component 16, which includes a suction portion 161 and a third clamping portion 162. The suction portion 161 is arranged on one side of the third clamping portion 162 and protrudes from the third clamping portion 162. The top end of the suction portion 161 is sucked into the cover body 14, and a first gap is formed between the top end of the third clamping portion 162 and the cover body 14. At least part of the main body 12 is located in the first gap.

[0075] In this embodiment, if Figure 7 and Figure 8 As shown, the magnetic attraction part 16 is a stepped structure, and the suction part 161 is a magnetic material that can attract metal materials; when the cover body 14 is closed, due to the effect of magnetic attraction, the top surface of the suction part 161 can be fitted with the lower surface of the cover body 14, and the top surface of the third clamping part 162 and the lower surface of the cover body 14 form a first gap for clamping the main body 12, and at least part of the main body 12 is clamped in the first gap, thereby realizing the seal between the cover body 14 and the main body 12; when the main body 12 and the cover body 14 need to be opened, the suction part 161 can be placed parallel to the side of the main body 12 to realize opening the cover; this solution can realize tool-free maintenance, greatly improving the convenience of maintenance.

[0076] Magnets or magnetic materials are provided on the body 12 and the cover 14, and the body 12 and the cover 14 are connected together by the magnetic attraction of the magnetic member 16. This structure does not require the design of the connection structure between the magnetic member 16 and the body 12, and has the advantages of easy operation and simple structure.

[0077] The length of the third clamping portion 162 is greater than that of the suction portion 161 , so that when the suction portion 161 is sucked into the cover 14 and the third clamping portion 162 forms an angle with the side of the body 12 , a first gap can be formed between the top of the third clamping portion 162 and the cover 14 .

[0078] In the third embodiment, Figure 9 and Figure 10 As shown, the box body 1 also includes a turn buckle 17, which includes a first connecting portion 171 and a second connecting portion 172. The first connecting portion 171 is arranged on one side of the second connecting portion 172 and protrudes from the second connecting portion 172. The first connecting portion 171 is rotatably connected to the cover body 14, and a second gap is formed between the cover body 14 and the second connecting portion 172. At least part of the body 12 is located in the second gap.

[0079] In this embodiment, the first connection portion 171 is pivotally connected to the cover body 14, and the knob 17 can rotate relative to the cover body 14 around the pivot, so that when the second connection portion 172 faces the main body 12, a second gap can be formed between the top end of the second connection portion 172 and the cover body 14.

[0080] like Figure 9 As shown, when the cover 14 is closed, the position of the second connecting portion 172 can be adjusted to be perpendicular to the side of the main body 12 to form a second gap; when the cover needs to be opened, the position of the second connecting portion 172 can be adjusted to be parallel to the side of the main body 12 to release the main body 12 from the second gap; this solution can achieve tool-free maintenance, greatly improving the convenience of maintenance; and it has low material requirements and is highly feasible.

[0081] In some embodiments, as Figure 11 、 Figure 12 and Figure 13 As shown, the junction box further includes: a protective cover with two open ends, one end of the protective cover is connected to the box body 1, the other end of the protective cover extends toward the cable harness 22, and the portion of the first portion 211 located outside the box body 1 is located inside the protective cover.

[0082] In this embodiment, the protective cover is installed after the cable 2 is separated into multiple single-core wires outside the junction box. Alternatively, the protective cover can be installed after the cable 2 is separated into multiple single-core wires outside the junction box and the single-core wires are vertically passed through the sealed wire feedthrough 13 and connected to the terminal 111 of the terminal block 11. For maintenance, the protective cover can be retracted before the cable 2 is removed. The protective cover is located on the first portion 211 and is used to protect the exposed single-core wires in the first portion 211.

[0083] The protective cover can be installed on the side of the threading plate 13 or the body 12 or the inverter. The protective cover can be retractable or non-retractable, and both can achieve the protective effect of the exposed single core wire.

[0084] In some embodiments, as Figure 11 、 Figure 12 and Figure 13 As shown, the protective cover is a telescopic tube, and the end of the telescopic tube facing away from the box body 1 can move in a direction away from the box body 1 and a direction close to the box body 1.

[0085] The protective cover can be extended in a direction away from the box body 1 to cover the exposed single-core wire, thereby protecting the exposed single-core wire; the protective cover can be shortened in a direction close to the box body 1 to expose the exposed single-core wire for easy maintenance.

[0086] In this embodiment, a retractable protective cover is provided, and during maintenance, the protective cover can be retracted to avoid the exposed single-core wire of the first part 211 without disassembly, which is convenient for maintenance. The length of the protective cover can be adjusted according to the length of the exposed single-core wire, which is convenient for use.

[0087] Exemplarily, the protective cover may be a folding tube, a telescopic tube, or an elastic shrink tube.

[0088] The protective cover may be of at least one of the following structural forms:

[0089] In the first embodiment, Figure 11 As shown, the telescopic pipe includes a multi-section sleeve 181, which is sequentially sleeved from the inside to the outside. The end of the multi-section sleeve 181 away from the box body 1 can move in a direction away from the box body 1 and a direction close to the box body 1.

[0090] In this embodiment, multiple sections of the sleeve 181 are connected, and the protective cover can be easily extended and retracted to meet the requirements of cables 2 of different lengths.

[0091] Among them, the interior of the protective cover is a multi-layer structure, and the multi-section sleeves 181 are not separated from each other. When stretched, they will not exceed the maximum outline of the previous-level sleeve 181, and can completely enter the interior of the previous-level sleeve 181 when contracted; the first-level sleeve 181 is connected and installed with the wire guide plate 13, junction box or inverter in the form of flanging.

[0092] In the second embodiment, Figure 12 As shown, the telescopic tube is a bellows telescopic tube 182 , and one end of the bellows telescopic tube 182 facing away from the box body 1 can move in a direction away from the box body 1 and a direction close to the box body 1 .

[0093] In this embodiment, the design of the corrugated telescopic tube 182 allows the protective cover to be more smoothly extended and retracted, without worrying about misalignment or jamming between the sleeves 181 . At the same time, it can be bent into various shapes to adapt to different installation environments and the direction of the cable 2 .

[0094] Among them, the corrugated expansion tube 182 is divided into a large-diameter threading side and a terminal installation side, with a retractable elastic material in the middle; before wiring, pass the cable 2 through the large-diameter threading side of the corrugated expansion tube 182, and divide the cable 2 into multiple single-core wires outside the junction box. Let the single-core wire pass vertically through the threading plate 13 and then connect it to the terminal 111 of the terminal 11. Stretch the corrugated expansion tube 182 toward one side of the junction box until it contacts the threading plate 13, and then install and lock it. Figure 13 During maintenance, the mounting screws of the bellows telescopic tube 182 can be removed, and the bellows telescopic tube 182 can rebound to its initial position. Figure 12 As shown; the corrugated tube can be installed on the side of the threading plate 13 or the junction box or the inverter; since the corrugated telescopic tube 182 of this solution fully protects the single-core wire, the threading plate 13 can be perforated or hollowed out to expand the wiring range and improve the convenience of operation.

[0095] In some embodiments, as Figure 14 and Figure 16 As shown, the junction box further includes: an adapter 191 , which is located in the box body 1 , one end of the adapter 191 is connected to the terminal 11 , and the other end of the adapter 191 is connected to an end of the first part 211 away from the second part 212 .

[0096] In this embodiment, the adapter 191 is a conductor, and the adapter 191 is located inside the box body 1. One end of the adapter 191 is connected to the terminal 111 of the terminal block 11, and the other end of the adapter 191 extends toward the threading plate 13. After the multiple single-core wires of the cable 2 are extended into the threading plate 13, they are electrically connected to the other end of the adapter 191 to achieve electrical connection between the single-core wires and the terminal block 11.

[0097] Among them, such as Figure 15 and Figure 17 As shown, one end of adapter 191 can be formed with a through hole or a C-shaped hole. One end of adapter 191 is sleeved on the outside of terminal 111. Tightening the stud can realize the nut pressing adapter 191, which facilitates installation and reduces the possibility of one end of adapter 191 falling off terminal 111. The other end of adapter 191 can be connected to the single-core wire by plugging or snapping, thereby realizing a quick connection between adapter 191 and the single-core wire. Compared with the case of connecting the single-core wire to terminal 11, connecting adapter 191 to the single-core wire is faster and more convenient, and reduces the risk of circuit breaking.

[0098] It is understandable that in the related art, when connecting a single-core wire to the terminal post 111 of the terminal block, it is necessary to unscrew the stud on the terminal block, place the end of the single-core wire under the nut, and tighten the stud to press the nut against the end of the core wire, thereby achieving a fixed electrical connection between the core wire and the terminal post 111. This wiring method has the disadvantages of limited operating space and difficulty in wiring, and there is also the risk that the cable end can easily fall off the terminal post 111, causing a short circuit.

[0099] The present application sets an adapter 191 in the box body 1, which can reduce the length of the single-core wire entering the box body 1 and reduce the length of the wire core group 21 exposed outside the wiring sleeve 22, thereby protecting the wire core group 21; at the same time, there is no need to tighten the stud to achieve the electrical connection between the single-core wire and the terminal 111, and the electrical connection between the single-core wire and the terminal 111 can be achieved only by quick connection between the single-core wire and the adapter 191, which is convenient for connection, reduces the risk of short circuit, and improves the reliability of the junction box; at the same time, the use of the adapter 191 occupies a small internal space of the box body 1 and has little impact on the appearance of the junction box.

[0100] The adapter 191 may have at least one of the following structural forms:

[0101] In the first embodiment, Figure 14 As shown, the wire core group 21 includes multiple first parts 211, and the adapters 191 include multiple, and one end of the multiple first parts 211 is connected to one end of the multiple adapters 191 in a one-to-one correspondence.

[0102] In this embodiment, multiple adapters 191 are independent structures, and the shape and length of each adapter 191 can be determined according to the position of the terminal 111. The number of adapters 191 corresponds to the number of single-core wires in the core group 21. One end of each adapter 191 is connected to the terminal 111, and the other end of each adapter 191 is connected to the first portions 211.

[0103] Exemplarily, the adapter 191 may be a wire, a strip or a core of various conductors. The adapter 191 may be a soft wire or a hard material that is arranged in a certain space and does not conflict with each other.

[0104] In some embodiments, as Figure 15 As shown, the adapter 191 is connected to the OT connector of the terminal block 11. The line input end of the adapter 191 can be a solid cylinder, which is tightly connected to the circular sleeve of the OT connector. The line output end of the adapter 191 can be a circular sleeve, which is used to fasten the line input end of the single-core wire.

[0105] In some embodiments, to ensure that adjacent circuits do not interfere with each other, the outer side of the adapter 191 is made of insulating material.

[0106] In the second embodiment, the core group 21 includes a plurality of first parts 211, such as Figure 17 As shown, the adapter 191 includes a connector 1911 and a plurality of first terminals 1912 and a plurality of second terminals 1913 respectively arranged on both sides of the connector 1911. The plurality of first terminals 1912 are connected one-to-one with the terminals 111 of the terminal block 11, and the plurality of second terminals 1913 are connected one-to-one with the plurality of first parts 211.

[0107] In this embodiment, if Figure 17 As shown, the adapter 191 is an integrated structure, and the adapter 191 is an adapter integrated board. The adapter 191 is arranged with an input port on the incoming line side and an output port on the outgoing line side. The input port on the incoming line side includes a plurality of first wiring terminals 1912, and the plurality of first wiring terminals 1912 are connected one-to-one with the wiring posts 111 of the wiring terminal 11; the output port on the outgoing line side includes a plurality of second wiring terminals 1913, and the plurality of second wiring terminals 1913 are connected one-to-one with the plurality of first parts 211.

[0108] In this embodiment, the AC cable 2 does not need to be distributed at different angles, and the single-core wire can directly enter the output interface of the integrated board vertically without the risk of deformation, thereby improving connection reliability.

[0109] In some embodiments, multiple first terminals 1912 and multiple second terminals 1913 are electrically connected one-to-one, multiple first terminals 1912 and multiple second terminals 1913 are externally insulated and isolated, and the internal connecting paths between the multiple first terminals 1912 and the multiple second terminals 1913 are not connected to each other and do not interfere with each other, thereby improving the output stability of the three-phase AC.

[0110] In some embodiments, to ensure safety, the surface of the adapter 191 is insulated.

[0111] An embodiment of the present application further provides an inverter, comprising a junction box as described in any of the above embodiments.

[0112] According to the inverter provided in the embodiment of the present application, by setting the distribution point of the cable 2 outside the junction box, the cable 2 can be directly distributed outside the box body 1 of the junction box, and the multiple single-core wires after distribution extend into the box body 1 and are electrically connected one-to-one with the multiple terminal posts 111 of the terminal 11. Compared with the wiring method of distributing the cable 2 inside the box body 1, on the one hand, the distribution of the cable 2 can be carried out at a distance, the flexibility of the single-core wire on the wiring side is high, and the operation is relatively easy and convenient; on the other hand, the junction box is extremely simplified and only needs to accommodate the terminal 11, the spatial size of the box body 1 is greatly reduced, and consumables are reduced; on the third hand, the wire threading hole 131 on the box body 1 can be set to correspond to the terminal post 111 of the terminal 11 in the height direction, and the single-core wire can enter the wire threading hole 131 vertically, reducing the deflection angle of the single-core wire and reducing the lateral shear force on the terminal post 111, thereby playing a certain protective role for the terminal 11.

[0113] An embodiment of the present application further provides a photovoltaic system, comprising an inverter as described in any of the above embodiments.

[0114] According to the photovoltaic system provided in the embodiment of the present application, by setting the distribution point of the cable 2 outside the junction box, the cable 2 can be directly distributed outside the box body 1 of the junction box, and the multiple single-core wires after distribution are extended into the box body 1 and electrically connected one-to-one with the multiple terminal posts 111 of the terminal 11. Compared with the wiring method of distributing the cable 2 inside the box body 1, on the one hand, the distribution of the cable 2 can be carried out at a distance, the flexibility of the single-core wire on the wiring side is higher, and the operation is relatively easy and convenient; on the other hand, the junction box is extremely simplified and only needs to accommodate the terminal 11, and the spatial size of the box body 1 is greatly reduced, reducing consumables; on the third hand, the wire threading hole 131 on the box body 1 can be set to correspond to the terminal post 111 of the terminal 11 in the height direction, and the single-core wire can enter the wire threading hole 131 vertically, reducing the deflection angle of the single-core wire, reducing the lateral shear force on the terminal post 111, and playing a certain protective role on the terminal 11.

[0115] The terms "first," "second," and the like in the specification and claims of this application are used to distinguish similar objects, and are not used to describe a specific order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate, so that the embodiments of this application can be implemented in an order other than that illustrated or described herein, and that the objects distinguished by "first," "second," and the like are generally of the same type, and do not limit the number of objects; for example, the first object can be one or more. In addition, the term "and / or" in the specification and claims refers to at least one of the connected objects, and the character " / " generally indicates that the objects connected are in an "or" relationship.

[0116] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0117] In the description of this application, "first feature" and "second feature" may include one or more of the features.

[0118] In the description of this application, “plurality” means two or more.

[0119] In the description of the present application, a first feature being “on” or “under” a second feature may include the first and second features being in direct contact with each other, or the first and second features being in contact with each other not directly but via another feature therebetween.

[0120] In the description of this application, a first feature “on”, “above” and “above” a second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature.

[0121] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0122] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions, and variations may be made to the embodiments without departing from the principles and intent of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. A junction box, used in a photovoltaic system, characterized in that: include: A box body, wherein the box body is provided with a connection terminal; A cable, the cable comprising a core group and a cable sleeve, the core group comprising a first part and a second part connected to each other, the end of the first part facing away from the second part extending into the box body and connected to the terminal, the multiple second parts of the core group being located outside the box body and at least partially located inside the cable sleeve.

2. The junction box according to claim 1, wherein: The box body includes a main body and a threading plate, the main body is provided with a notch, and the threading plate is arranged in the notch to enclose an accommodating cavity for accommodating the terminal; The threading plate is provided with threading holes, and the threading holes are used for the wire core group to pass through.

3. The junction box according to claim 1, wherein: The box body comprises a main body and a cover body, and the cover body is connected to the main body via a quick-release structure.

4. The junction box according to claim 3, characterized in that: One of the body and the cover is provided with a first clamping portion, and the other of the body and the cover is provided with a second clamping portion clamped with the first clamping portion; Alternatively, the box body further includes a magnetic member, the magnetic member including an attracting portion and a third clamping portion, the attracting portion is provided on one side of the third clamping portion and protrudes from the third clamping portion, the top end of the attracting portion is attracted to the cover body, a first gap is formed between the top end of the third clamping portion and the cover body, and at least a portion of the body is located in the first gap; Alternatively, the box body also includes a turn buckle, which includes a first connecting part and a second connecting part, the first connecting part is arranged on one side of the second connecting part and protrudes from the second connecting part, the first connecting part is rotatably connected to the cover body, and a second gap is formed between the cover body and the second connecting part, and at least part of the main body is located in the second gap.

5. The junction box according to any one of claims 1 to 4, characterized in that: Also includes: A protective cover with two open ends, one end of the protective cover is connected to the box body, the other end of the protective cover extends toward the cable sleeve, and the part of the first part located outside the box body is located inside the protective cover.

6. The junction box according to claim 5, characterized in that: The protective cover is a telescopic tube, and one end of the telescopic tube facing away from the box body can move in a direction away from the box body and in a direction close to the box body.

7. The junction box according to claim 6, characterized in that: The telescopic tube is a multi-section sleeve, which is sleeved in sequence from the inside to the outside. One end of the multi-section sleeve away from the box body can move in a direction away from the box body and in a direction close to the box body.

8. The junction box according to claim 6, characterized in that: The telescopic tube is a bellows telescopic tube, and one end of the bellows telescopic tube away from the box body can move in a direction away from the box body and in a direction close to the box body.

9. The junction box according to any one of claims 1 to 4, characterized in that: Also includes: An adapter is located in the box body, one end of the adapter is connected to the wiring terminal, and the other end of the adapter is connected to an end of the first part away from the second part.

10. The junction box according to claim 9, characterized in that: The wire core group includes multiple first parts, and the adapters include multiple ones, and one end of the multiple first parts is connected to one end of the multiple adapters in a one-to-one correspondence.

11. The junction box according to claim 9, characterized in that: The wire core group includes multiple first parts, and the adapter includes a connecting part and multiple first terminals and multiple second terminals respectively arranged on both sides of the connecting part. The multiple first terminals are connected to the terminals of the terminal block in a one-to-one correspondence, and the multiple second terminals are connected to the multiple first parts in a one-to-one correspondence.

12. An inverter, characterized in that: The method comprises the junction box according to any one of claims 1 to 11.

13. A photovoltaic system, characterized in that: Comprising the inverter as claimed in claim 12.

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