Photovoltaic combiner box suitable for land maintenance site

Abstract

The invention belongs to the technical field of combiner boxes, and particularly relates to a photovoltaic combiner box suitable for a land maintenance site, and the combiner box comprises a combiner box assembly which is used for carrying out the convergence of the positive and negative output of four photovoltaic panels, and the combiner box assembly comprises a cabinet body. The connection assemblies arranged in the positive electrode access port, the negative electrode access port, the positive electrode outlet, the negative electrode outlet, the positive electrode insertion port and the negative electrode insertion port in the cabinet body of the combiner box assembly can effectively buffer the large hooking force borne by the electric wire when the vegetation maintenance equipment hooks and pulls the exposed electric wire; and the wire is prevented from being broken when being hooked by equipment.

Description

Technical Field

[0001] The present invention belongs to the technical field of combiner boxes, and in particular relates to a photovoltaic combiner box suitable for land maintenance sites. Background Art

[0002] At present, the combination of photovoltaic panels and ground planting is an effective way to improve desert conditions. It can not only use solar energy to generate electricity, but also use photovoltaic panels to shade the sand to reduce the evaporation of ground water and keep plants with sufficient water for normal growth.

[0003] The process of planting plants in the sand under photovoltaic panels involves changing the soil, watering and subsequent maintenance of the plants. Maintenance is generally done manually and by machines. During the maintenance process, it is common for the wires connecting the junction box to the photovoltaic panels to be accidentally pulled down, or for the mechanized equipment used for maintenance to accidentally hit the fragile junction box bracket. These mistakes may cause the wires to break, which will be accompanied by electric arcing and the risk of fire.

[0004] The structure of the photovoltaic combiner box disclosed in the existing patent with application number 202021955169.X includes fuses, circuit breakers, lightning arresters and isolating switches. These structures ensure that the entire photovoltaic system will not be affected when a photovoltaic component inside the combiner box fails, but they do not have the function of preventing electric arcs from being generated when the wires are broken by hand.

[0005] When maintaining the plants under the photovoltaic panels, electrical equipment will be used, but there is no power supply interface on the junction box. The electricity used by these electrical equipment cannot be drawn from the junction box, which is not convenient for the effective operation of the electrical equipment used to maintain the plants.

[0006] In addition, planting plants under photovoltaic panels will inevitably lead to a large amount of water vapor around the photovoltaic panels. The waterproof membrane in the waterproof breathable valve at the bottom of the junction box needs to be replaced frequently to ensure its waterproof function. If the waterproof membrane is not replaced in time, the electrical components in the junction box will be damaged due to the increase in water vapor.

[0007] The present invention designs a photovoltaic combiner box suitable for land maintenance sites to solve the above problems. Summary of the invention

[0008] Based on this, it is necessary to provide a photovoltaic combiner box suitable for land maintenance sites in response to the problems existing in the current photovoltaic combiner boxes. The leg assembly used to connect the bracket and the combiner box assembly in the present invention can be disconnected from between the first disc and the second disc when subjected to a violent impact, so that the impact on the combiner box assembly is effectively buffered, thereby ensuring that the cabinet of the combiner box assembly does not deform or be damaged when subjected to an impact, and further ensuring that the electrical components in the cabinet of the combiner box assembly will not be squeezed and damaged due to the deformation of the cabinet. The connection components provided in the positive access port, negative access port, positive junction port, negative junction port, positive plug interface, and negative plug interface on the cabinet of the combiner box assembly in the present invention can effectively buffer the large hooking force on the wires when the equipment used to repair vegetation hooks onto the exposed wires, thereby preventing the wires from being disconnected when being hooked by the equipment. The connection assembly in the present invention first disconnects the first circuit breaker, the second circuit breaker, or the third circuit breaker on the corresponding line in the cabinet when the corresponding exposed wire is disconnected due to a large pulling force, effectively avoiding arcing when the wire breaks due to tension, and ensuring that the wire will not cause a fire due to arcing after disconnection. The connection assembly in the present invention is arranged in the positive and negative plug interfaces on the cabinet side walls of the junction box assembly and is connected one-to-one with the positive and negative electrodes connected by the isolating switch in the cabinet, providing a power supply interface for the power equipment used to repair the vegetation under the photovoltaic panel, ensuring that the power equipment used to maintain the vegetation can perform effective vegetation maintenance work due to continuous power supply. The air permeable valve assembly arranged at the bottom of the cabinet of the junction box assembly in the present invention effectively ventilates the inside and outside of the cabinet of the junction box assembly, and at the same time absorbs and discharges water vapor generated in the cabinet through the water-permeable and breathable membrane, water-absorbing plug, water-absorbing strip and water-absorbing ball therein. The water-permeable and breathable membrane in the air permeable valve assembly vibrates when external air enters through the air holes due to strong winds, and an outward thrust is generated at the air holes, so that the air holes will not be blocked, thereby ensuring that the entire air permeable valve assembly continues to perform the waterproof and breathable functions, reducing the maintenance and replacement costs of the waterproof and breathable valve.

[0009] The above purpose is achieved through the following technical solutions: A photovoltaic combiner box suitable for a land maintenance site, used for combining the outputs of several photovoltaic panels, comprising: A junction box assembly is used to combine the positive and negative outputs of four photovoltaic panels. The junction box assembly includes a cabinet, and eight fuses, eight first fuses electrically connected to the fuses one by one, eight lightning arresters electrically connected to the first circuit breakers one by one, disconnectors electrically connected to the eight lightning arresters, third circuit breakers electrically connected to the disconnectors, and two second circuit breakers connected in parallel with the third circuit breakers are arranged in the cabinet. A pair of positive access ports and a pair of negative access ports are opened on both sides of the upper end of the cabinet, and a positive junction port, a negative junction port, a positive plug port, and a negative plug port are opened on one side of the lower end of the cabinet. The positive access port and the negative access port are both provided with There is a connection component electrically connected to the corresponding fuse, the positive electrode confluence outlet and the negative electrode confluence outlet are both provided with a connection component electrically connected to the third circuit breaker, the positive electrode plug interface and the negative electrode plug interface are provided with two connection components electrically connected to the second circuit breaker in a one-to-one correspondence, and the connection component has the characteristics of buffering the tension exerted on the corresponding wires and first disconnecting the first circuit breaker or the second circuit breaker or the third circuit breaker when the corresponding wires are pulled and disconnected; a waterproof, breathable and anti-blocking air valve component is provided at the first air vent at the bottom of the cabinet, a cabinet door is provided on the front side of the cabinet, and the cabinet is arranged on a bracket for installing a photovoltaic panel through a leg component that is easily broken when hit.

[0010] In one of the embodiments, the connecting component includes a first ring sleeve arranged at the positive electrode access port or the negative electrode access port or the positive electrode outlet or the negative electrode outlet or the positive electrode plug interface or the negative electrode plug interface, a wire tube is slidably arranged in the first ring sleeve, and an electrical connection copper sleeve electrically connected to the copper core of the wires at both ends is arranged in the wire tube, a first circular ring matching with the first ring sleeve is arranged at the exposed end of the wire tube, a first spring driving the wire tube to be inserted into the first ring sleeve is connected between the first circular ring and the side wall of the cabinet, a second ring sleeve is arranged on the first circular ring, the inner diameter of the second ring sleeve is larger than the inner diameter of the wire tube, a plurality of first clamping strips evenly distributed in the circumferential direction are arranged at the end of the second ring sleeve, and a first screw threadedly connected to the second ring sleeve A sleeve, a conical surface cooperating with the first clamping strip is arranged in the first screw sleeve, the inner end of the wire tube is threadedly connected with a third ring sleeve, a third circular ring cooperating with the end of the wire tube is arranged in the third ring sleeve, a plurality of second clamping strips are evenly arranged on the end of the third ring sleeve in a circumferential direction, a second screw sleeve is threadedly connected with the end of the second ring sleeve, a conical surface cooperating with the second clamping strip is arranged on the inner wall of the second screw sleeve, a second circular ring is arranged on the outer side of the third ring sleeve, a rotating sleeve is rotatably arranged on the second circular ring, a second pull rope connected with the switch lever of the first circuit breaker or the switch lever of the second circuit breaker or the switch lever of the third circuit breaker is arranged on the rotating sleeve, and a second spring is connected between the second circular ring and the inner wall of the cabinet.

[0011] In one embodiment, a third hanging ear is provided on the rotating sleeve, a third hanging ear is connected to the third hanging ear, the third hanging ring is connected to a fourth hanging ring through a second pull rope, the fourth hanging ring is connected to the fourth hanging ear on the clamping sleeve, and the clamping sleeve is fixed to the switch lever of the first circuit breaker, the switch lever of the second circuit breaker, or the switch lever of the third circuit breaker by a bolt set.

[0012] In one embodiment, the air valve assembly includes a fourth ring sleeve arranged at the first air hole at the bottom of the cabinet, the lower end of the fourth ring sleeve is threadedly connected to a cover, a frustum cooperating with the lower end of the fourth ring sleeve is arranged around the bottom of the cover, the bottom of the cover is provided with a water absorption plug for filling the fourth ring sleeve, a plurality of second air holes connected to the bottom of the cover are evenly arranged on the side wall of the lower end of the cover, a water absorption strip is arranged in the third plug hole at the bottom of the cover, one end of the water absorption strip is buried in the water absorption plug, the other end of the water absorption strip is exposed and provided with a water absorption ball, the first air hole is threadedly connected to a third screw sleeve, and a waterproof breathable membrane is arranged in the third screw sleeve.

[0013] In one of the embodiments, a soft sleeve is provided on the outside of the exposed portion of the water-absorbing strip.

[0014] In one of the embodiments, the cabinet is suspended below the photovoltaic panel with the assistance of two first pull ropes connected to the bracket at both sides of the upper end thereof.

[0015] In one embodiment, the upper and lower ends of the first pull rope are respectively connected to a first hanging ring and a second hanging ring, the first hanging ring is connected to a first hanging ear on the bracket, and the second hanging ring is connected to a second hanging ear on the cabinet.

[0016] In one embodiment, the bracket is fixed to a concrete pile in the sand by bolts, and the concrete pile is cast in a cylindrical pit on the sand using a steel frame and concrete.

[0017] In one embodiment, the leg assembly is connected to a first leg and a second leg connected to the bottom of the cabinet by bolts, the upper end of the first leg is provided with a first disc, the upper edge of the first disc is provided with a first conical surface, the lower end surface of the first disc is provided with two first sockets which are 180 degrees apart in circumference and connected to the first conical surface, the lower end of the second leg is provided with a second disc, the lower edge of the second disc is provided with a second conical surface, the upper end surface of the second disc is provided with two second sockets which are connected to the second conical surface and correspond one to one with the first sockets, two pull rods passing through the first socket and the second socket are connected between the first disc and the second disc, the pull rods are threadedly connected with a brittle nut which clamps the first disc and the second disc to each other and is easily broken under the action of external force, the upper end of the second leg is provided with an insert plate, the insert plate cooperates with the insert sleeve at the bottom of the cabinet, and a locking screw which cooperates with the insert plate is provided in the threaded hole on the insert sleeve.

[0018] In one embodiment, a positioning groove is provided in the middle of the upper end of the first disc, and a positioning pin cooperating with the positioning groove is provided at the lower end of the second disc.

[0019] The beneficial effects of the present invention are: 1. The leg assembly for connecting the bracket and the combiner box assembly in the present invention can be disconnected from between the first disc and the second disc when subjected to a violent impact, so that the impact on the combiner box assembly is effectively buffered, thereby ensuring that the cabinet of the combiner box assembly is not deformed or damaged when subjected to an impact, and further ensuring that the electrical components in the cabinet of the combiner box assembly are not squeezed or damaged due to the deformation of the cabinet.

[0020] 2. The connection components provided in the positive electrode access port, negative electrode access port, positive electrode junction port, negative electrode junction port, positive electrode plug port and negative electrode plug port on the cabinet of the junction box assembly in the present invention can effectively buffer the large pulling force exerted on the wires when the equipment used for repairing vegetation hooks onto the exposed wires, thereby preventing the wires from being disconnected when being hooked onto the equipment.

[0021] 3. When the corresponding exposed wire is disconnected due to a large pulling force, the connection assembly in the present invention first disconnects the first circuit breaker, the second circuit breaker or the third circuit breaker on the corresponding line in the cabinet, effectively avoiding the generation of arcs when the wires are broken due to tension, and ensuring that no fire will occur due to arcs after the wires are disconnected.

[0022] 4. The connection components arranged in the positive and negative pole plug interfaces on the cabinet side walls of the junction box assembly of the present invention and respectively connected to the positive and negative electrodes output from the isolating switch in the cabinet provide a power supply interface for the power equipment used to repair the vegetation under the photovoltaic panels, thereby ensuring that the power equipment used to maintain the vegetation can perform effective vegetation maintenance work due to continuous power supply.

[0023] 5. The air-permeable valve assembly arranged at the bottom of the cabinet of the junction box assembly in the present invention effectively ventilates the inside and outside of the cabinet of the junction box assembly, and at the same time absorbs and discharges water vapor generated in the cabinet through the water-permeable and breathable membrane, water-absorbing plug, water-absorbing strip and water-absorbing ball therein. The water-permeable and breathable membrane in the air-permeable valve assembly vibrates when external air enters through the air holes due to strong winds, and an outward thrust is generated at the air holes, so that the air holes will not be blocked, thereby ensuring that the entire air-permeable valve assembly continues to perform the waterproof and breathable functions, reducing the maintenance and replacement costs of the waterproof and breathable valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 are two overall schematic diagrams of the present invention; Figure 2 is a cross-sectional view of the basic structure of the support of the present invention; Figure 3 It is a partial diagram of the bracket in the present invention; Figure 4 This is a partial structural diagram of the connection between the combiner box assembly and the top of the bracket; Figure 5 It is a cross-sectional view of the cooperation between the leg assembly and the combiner box assembly; Figure 6 is a cross-sectional view of the cooperation between the first disc and the second disc in the leg assembly; Figure 7 is a cross-sectional view showing the state change of the first disc and the second disc in the leg assembly; Figure 8 is a schematic diagram of the structure of the first disc and the second disc; Fig. 9 are two schematic diagrams of combiner box assemblies; Fig.10 It is a cross-sectional view of the overall structure of the combiner box assembly; Fig.11 These are two structural diagrams of the cabinet; Fig.12 is a cross-sectional view of a vent valve assembly; Fig.13 It is a structural cross-sectional view of a sealing cover in a waterproof breathable valve; Fig.14 is a cross-sectional view of the connection assembly and the first circuit breaker; Fig.15 is a cross-sectional view of the connection assembly and the second circuit breaker; Fig.16 The connection assembly cooperates with the third circuit breaker and its cross-sectional view; Fig.17 It is the coordination and partial cross-sectional diagram of the connection assembly and the first circuit breaker, the second circuit breaker or the third circuit breaker; Fig.18 It is a cross-sectional view of the connection components and the cabinet body; Fig.19 It is the structure on the line pipe in the connection assembly and its cross-sectional view; Fig. 20 It is the structure on the third ring sleeve in the connection assembly and its cross-sectional view; Name of the label in the figure: 101, sand; 102, bracket; 103, bolt; 104, concrete pile; 105, first hanging ear; 106, photovoltaic panel; 107, first hanging ring; 108, first pull rope; 109, second hanging ring; 110, second hanging ear; 111, wire; 200, leg assembly; 201, first leg; 202, first disc; 203, first cone; 204, positioning groove; 205, first plug hole; 206, second leg; 207, second disc; 208, second cone; 209, second plug hole; 210, positioning pin; 211, plug plate; 212, pull rod; 213, brittle nut; 214, plug sleeve; 215, locking screw; 300, combiner box assembly; 301, cabinet; 302, positive electrode inlet; 303, negative electrode inlet; 304, positive electrode outlet; 305, negative electrode outlet; 306, positive electrode plug interface; 307, negative electrode plug interface; 308, first vent; 309, cabinet door; 310, fuse; 311, first circuit breaker; 312, lightning arrester; 313, disconnector; 314, second circuit breaker; 315, third circuit breaker; 400, connecting assembly; 401, first ring; 402, wire tube; 403, electric copper sleeve; 404, first circular ring; 405, second ring; 406, first clamping strip; 407, first screw sleeve; 408, first spring; 409, second circular ring; 410, third ring; 411, third circular ring; 412, second clamping strip; 413, second screw sleeve; 414, second spring; 415, rotating sleeve; 416, third hanging ear; 417, third hanging ring; 418, second pull rope; 419, fourth hanging ring; 420, fourth hanging ear; 421, clamping sleeve; 500, air-permeable valve assembly; 501, fourth ring sleeve; 502, third screw sleeve; 503, water-permeable and air-permeable membrane; 504, sealing cover; 505, frustum; 506, third plug hole; 507, second air-permeable hole; 508, water-absorbing plug; 509, water-absorbing strip; 510, water-absorbing ball; 511, sleeve. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below through embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0026] The serial numbers assigned to the components herein, such as "first", "second", etc., are only used to distinguish the objects described and do not have any order or technical meaning. The "connection" and "coupling" mentioned in this application, unless otherwise specified, include direct and indirect connections (couplings). In the description of the present invention, it should be understood that the orientation or position relationship indicated by the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc. are based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention.

[0027] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0028] like Figure 1-20 As shown, a photovoltaic combiner box suitable for a land maintenance site is used to combine the outputs of a plurality of photovoltaic panels 106, comprising: A junction box assembly 300 is used to combine the positive and negative outputs of four photovoltaic panels 106. The junction box assembly 300 includes a cabinet 301. The cabinet 301 is provided with eight fuses 310, eight first fuses 310 electrically connected to the fuses 310 in a one-to-one correspondence, eight lightning arresters 312 electrically connected to the first circuit breakers 311 in a one-to-one correspondence, an isolating switch 313 electrically connected to the eight lightning arresters 312, a third circuit breaker 315 electrically connected to the isolating switch 313, and two second circuit breakers 314 connected in parallel with the third circuit breakers 315. A pair of positive access ports 302 and a pair of negative access ports 303 are provided on both sides of the upper end of the cabinet 301. A positive junction port 304, a negative junction port 305, a positive plug port 306, and a negative plug port 307 are provided on one side of the lower end of the cabinet 301. The positive access port 302 and the negative access port 303 are both provided with a positive electrode. A connection assembly 400 electrically connected to the corresponding fuse 310 is provided, and a connection assembly 400 electrically connected to the third circuit breaker 315 is provided in the positive electrode confluence outlet 304 and the negative electrode confluence outlet 305. Two connection assemblies 400 electrically connected to the second circuit breaker 314 are provided in the positive electrode plug interface 306 and the negative electrode plug interface 307. The connection assembly 400 has the characteristics of buffering the tension exerted on the corresponding wire 111 and first disconnecting the first circuit breaker 311 or the second circuit breaker 314 or the third circuit breaker 315 when the corresponding wire 111 is pulled and disconnected; a waterproof, breathable and anti-blocking air valve assembly 500 is provided at the first air vent 308 at the bottom of the cabinet 301, and a cabinet door 309 is provided on the front side of the cabinet 301. The cabinet 301 is arranged on the bracket 102 for installing the photovoltaic panel 106 through a leg assembly 200 that is easy to break when hit.

[0029] All the circuit breakers in the present invention have an arc extinguishing function, which can extinguish the arc generated during the power-off process.

[0030] In a further embodiment, Fig.14 , Fig.15 , Fig.16 , Fig.17 , Fig.18As shown, the connection component 400 includes a first ring sleeve 401 arranged at the positive electrode access port 302 or the negative electrode access port 303 or the positive electrode outlet 304 or the negative electrode outlet 305 or the positive electrode plug port 306 or the negative electrode plug port 307, a wire tube 402 is slidably arranged in the first ring sleeve 401, and an electric connection copper sleeve 403 electrically connected to the copper core of the wires 111 at both ends is arranged in the wire tube 402, and the exposed end of the wire tube 402 is provided with a first circular ring 404 matched with the first ring sleeve 401, and a first spring 408 for driving the wire tube 402 to be inserted into the first ring sleeve 401 is connected between the first circular ring 404 and the side wall of the cabinet 301, and a second ring sleeve 405 is arranged on the first circular ring 404, and the inner diameter of the second ring sleeve 405 is larger than the inner diameter of the wire tube 402, and a plurality of first clamping strips 406 uniformly distributed in the circumferential direction are arranged at the end of the second ring sleeve 405, and a first threaded connection is threaded on the second ring sleeve 405. The first screw sleeve 407 is provided with a conical surface matched with the first clamping strip 406, the inner end of the wire tube 402 is threadedly connected with a third ring sleeve 410, and the third ring sleeve 410 is provided with a third ring 411 matched with the end of the wire tube 402, and the end of the third ring sleeve 410 is evenly provided with a plurality of second clamping strips 412 in the circumferential direction, and the end of the second ring sleeve 405 is threadedly connected with a second screw sleeve 413, and the inner wall of the second screw sleeve 413 is provided with a A conical surface is provided to cooperate with the second clamping strip 412, and a second circular ring 409 is provided on the outer side of the third ring sleeve 410. A rotating sleeve 415 is rotatably provided on the second circular ring 409, and a second pull rope 418 connected to the switch lever of the first circuit breaker 311 or the switch lever of the second circuit breaker 314 or the switch lever of the third circuit breaker 315 is provided on the rotating sleeve 415. A second spring 414 is connected between the second circular ring 409 and the inner wall of the cabinet 301.

[0031] In a further embodiment, Fig.14 , Fig.15 , Fig.16 , Fig.17 , Fig.18 As shown, a third hanging ear 416 is provided on the rotating sleeve 415, and a third hanging ring 417 is connected to the third hanging ear 416. The third hanging ring 417 is connected to a fourth hanging ring 419 through a second pull rope 418. The fourth hanging ring 419 is connected to a fourth hanging ear 420 on a sleeve 421. The sleeve 421 is fixed to the switch lever of the first circuit breaker 311, the switch lever of the second circuit breaker 314, or the switch lever of the third circuit breaker 315 by a bolt 103.

[0032] In a further embodiment, Fig.11 , Fig.12As shown, the air valve assembly 500 includes a fourth ring sleeve 501 arranged at the first air hole 308 at the bottom of the cabinet 301, the lower end of the fourth ring sleeve 501 is threadedly connected to a cover 504, a frustum 505 matching the lower end of the fourth ring sleeve 501 is arranged around the bottom of the cover 504, the bottom of the cover 504 is provided with a water absorption plug 508 for filling the fourth ring sleeve 501, a plurality of second air holes 507 connected to the bottom of the cover 504 are evenly opened in the circumferential direction on the side wall of the lower end of the cover 504, a water absorption strip 509 is arranged in the third plug hole 506 at the bottom of the cover 504, one end of the water absorption strip 509 is buried in the water absorption plug 508, the other end of the water absorption strip 509 is exposed and provided with a water absorption ball 510, the first air hole 308 is threadedly connected to a third screw sleeve 502, and a waterproof breathable membrane is arranged in the third screw sleeve 502.

[0033] In a further embodiment, Fig.12 As shown, a soft sleeve 511 is provided on the outside of the exposed portion of the water-absorbing strip 509 .

[0034] In a further embodiment, Figure 1 As shown, the cabinet 301 is suspended below the photovoltaic panel 106 with the assistance of two first pull ropes 108 connected to the bracket 102 at both sides of its upper end.

[0035] In a further embodiment, Figure 4 As shown, the upper and lower ends of the first pull rope 108 are respectively connected to a first hanging ring 107 and a second hanging ring 109 , the first hanging ring 107 is connected to the first hanging ear 105 on the bracket 102 , and the second hanging ring 109 is connected to the second hanging ear 110 on the cabinet 301 .

[0036] In a further embodiment, Figure 1 , Figure 2 As shown, the bracket 102 is fixed to a concrete pile 104 in the sand 101 by bolts 103 . The concrete pile 104 is cast in a cylindrical pit on the sand 101 using a steel frame and concrete.

[0037] In a further embodiment, Figure 5 , Figure 6 , Figure 7 , Figure 8As shown, the leg assembly 200 is connected to a first leg 201 and a second leg 206 connected to the bottom of the cabinet 301 by bolts 103, the upper end of the first leg 201 is provided with a first disc 202, the upper edge of the first disc 202 is provided with a first conical surface 203, the lower end surface of the first disc 202 is provided with two first jacks 205 which are 180 degrees apart in the circumferential direction and are connected to the first conical surface 203, the lower end of the second leg 206 is provided with a second disc 207, the lower edge of the second disc 207 is provided with a second conical surface 208, the upper end surface of the second disc 207 is provided with a Two second sockets 209 are connected to the second conical surface 208 and correspond one to one with the first sockets 205. Two pull rods 212 passing through the first sockets 205 and the second sockets 209 are connected between the first disk 202 and the second disk 207. The pull rods 212 are threadedly connected with brittle nuts 213 that clamp the first disk 202 and the second disk 207 to each other and are easily broken under the action of external force. The upper end of the second leg 206 is provided with a plug plate 211, and the plug plate 211 cooperates with the plug sleeve 214 at the bottom of the cabinet 301. The threaded hole on the plug sleeve 214 is provided with a locking screw 215 that cooperates with the plug plate 211.

[0038] In a further embodiment, Figure 6 , Figure 7 , Figure 8 As shown, a positioning groove 204 is provided in the middle of the upper end of the first disc 202 , and a positioning pin 210 cooperating with the positioning groove 204 is provided at the lower end of the second disc 207 .

[0039] The leg assembly 200 used to connect the bracket 102 and the junction box assembly 300 in the present invention can be disconnected from the first disc 202 and the second disc 207 when it is hit violently, so that the impact on the junction box assembly 300 is effectively buffered, thereby ensuring that the cabinet 301 of the junction box assembly 300 does not deform or damage when it is hit, and further ensuring that the electrical components in the cabinet 301 of the junction box assembly 300 will not be squeezed and damaged due to the deformation of the cabinet 301. The connection assembly 400 provided in the positive electrode access port 302, the negative electrode access port 303, the positive junction port 304, the negative junction port 305, the positive plug port 306 and the negative plug port 307 on the cabinet 301 of the junction box assembly 300 in the present invention can effectively buffer the large hooking force on the wire 111 when the equipment used for repairing vegetation hooks onto the exposed wire 111, thereby preventing the wire 111 from being disconnected when being hooked by the equipment. The connection assembly 400 of the present invention disconnects the first circuit breaker 311 or the second circuit breaker 314 or the third circuit breaker 315 on the corresponding line in the cabinet 301 first when the corresponding exposed wire 111 is disconnected due to a large pulling force, effectively avoiding arcing when the wire 111 is broken due to tension, and ensuring that the wire 111 will not cause a fire due to arcing after being disconnected. The connection assembly 400 of the present invention is arranged in the positive electrode plug interface 306 and the negative electrode plug interface 307 on the side wall of the cabinet 301 of the junction box assembly 300 and is respectively connected to the positive and negative electrodes merged by the isolating switch 313 in the cabinet 301. Provide a power supply interface for the power equipment used to repair the vegetation under the photovoltaic panel 106, ensuring that the power equipment used to maintain the vegetation can perform effective vegetation maintenance work due to continuous power supply. The air permeable valve assembly 500 arranged at the bottom of the cabinet 301 of the junction box assembly 300 in the present invention effectively ventilates the inside and outside of the cabinet 301 of the junction box assembly 300, and at the same time absorbs and discharges water vapor generated in the cabinet 301 through the water-permeable and breathable membrane 503, water-absorbing plug 508, water-absorbing strip 509 and water-absorbing ball 510 therein. The water-permeable and breathable membrane 503 in the air permeable valve assembly 500 vibrates when external air enters through the second air hole 507 due to strong wind, which will generate an outward thrust at the second air hole 507, so that the second air hole 507 will not be blocked, thereby ensuring that the entire air permeable valve assembly 500 continues to perform the waterproof and breathable functions, reducing the maintenance and replacement costs of the waterproof and breathable valve.

[0040] The operation process of the present invention is as follows: In the initial state, the second pull rope 418 in the connection assembly 400 is always in a relaxed state, ensuring that the corresponding connection assembly 400 has sufficient buffer length for the tension on the corresponding wire 111, the first spring 408 and the second spring 414 are in a stretched state and a compressed state respectively, the first ring 404 abuts against the first ring sleeve 401, the first clamping strip 406 at the end of the second ring sleeve 405 clamps and fixes the corresponding wire 111 under the action of the first screw sleeve 407, the third ring 411 abuts against the end of the wire tube 402, the second clamping strip 412 on the third ring sleeve 410 clamps and fixes the corresponding wire 111 under the action of the second screw sleeve 413, and the wire tube 402 connects the copper cores of the two wires 111 at both ends. The first disc 202 in the leg assembly 200 and the two pull rods 212 under the second disc 207 are clamped to each other, and the positioning pin 210 is located in the positioning groove 204 to position the first disc 202 and the second disc 207.

[0041] like Fig.18 As shown, when the outer wire 111 of the connecting component 400 is pulled, the pulled wire 111 will drive the entire connecting component 400 to move outward to a certain extent, so that the first spring 408 and the second spring 414 are further stretched and compressed respectively, and the connecting component 400 drives the wire 111 connected to it in the inner cabinet 301 to move synchronously to a certain extent, and the third ring sleeve 410 in the connecting component 400 reduces the slack of the corresponding second pull rope 418. The movement of the connecting component 400 can effectively buffer the tension on the corresponding side wire 111, thereby preventing the wire 111 from being disconnected within a certain tension range. When the movement amplitude of the connecting assembly 400 is large, the second pull rope 418 is tightened and pulls the switch lever of the first circuit breaker 311 or the switch lever of the second circuit breaker 314 or the switch lever of the third circuit breaker 315, so that the first circuit breaker 311 or the second circuit breaker 314 or the third circuit breaker 315 is effectively closed before the wire 111 is broken, thereby preventing an arc from being generated when the wire 111 is broken.

[0042] like Figure 6 , Figure 7 As shown, when the leg assembly 200 is hit, the brittle nuts 213 on the two tie rods 212 break under the action of external force, the two tie rods 212 bend and deform, and the second leg 206 drives the second disc 207 to swing relative to the first disc 202 on the first leg 201 under the action of external force, and the positioning pin 210 disengages from the positioning groove 204. The first conical surface 203 on the first disc 202 and the second conical surface 208 on the second disc 207 do not interfere with the swing of the second disc 207 relative to the first disc 202, so that the leg assembly 200 can effectively buffer the impact force it receives when it is hit, thereby preventing the cabinet 301 of the junction box assembly 300 from deformation and damage, thereby protecting the electrical components in the cabinet 301 from being squeezed and damaged.

[0043] When the leg assembly 200 is damaged due to collision, the combiner box assembly 300 is suspended in the air under the pulling of the two first pull ropes 108 and will not fall or be damaged.

[0044] like Fig.12 As shown, the water absorption strip 509 in the air valve assembly 500 drives the water absorption ball 510 to swing under the action of wind, and the water in the water absorption ball 510 is discharged under the action of wind. The water absorption ball 510 that has completed drainage under the action of wind can continuously bring out the water in the water absorption plug 508 through the water absorption strip 509, thereby ensuring that the water absorption plug 508 has the function of continuously absorbing water vapor in the cabinet 301. The elastic membrane in the air valve assembly 500 can vibrate using the wind force entering from the air hole, thereby promoting the air flow in the air hole, thereby achieving the purpose of preventing the air hole from being blocked.

Claims

1. A photovoltaic combiner box suitable for land maintenance sites, used to combine the outputs of several photovoltaic panels, characterized in that: include: A junction box assembly is used to combine the positive and negative outputs of four photovoltaic panels. The junction box assembly includes a cabinet, and eight fuses, eight first fuses electrically connected to the fuses one by one, eight lightning arresters electrically connected to the first circuit breakers one by one, disconnectors electrically connected to the eight lightning arresters, third circuit breakers electrically connected to the disconnectors, and two second circuit breakers connected in parallel with the third circuit breakers are arranged in the cabinet. A pair of positive access ports and a pair of negative access ports are opened on both sides of the upper end of the cabinet, and a positive junction port, a negative junction port, a positive plug port, and a negative plug port are opened on one side of the lower end of the cabinet. The positive access port and the negative access port are both provided with There is a connection component electrically connected to the corresponding fuse, the positive electrode confluence outlet and the negative electrode confluence outlet are both provided with a connection component electrically connected to the third circuit breaker, the positive electrode plug interface and the negative electrode plug interface are provided with two connection components electrically connected to the second circuit breaker in a one-to-one correspondence, and the connection component has the characteristics of buffering the tension exerted on the corresponding wires and first disconnecting the first circuit breaker or the second circuit breaker or the third circuit breaker when the corresponding wires are pulled and disconnected; a waterproof, breathable and anti-blocking air valve component is provided at the first air vent at the bottom of the cabinet, a cabinet door is provided on the front side of the cabinet, and the cabinet is arranged on a bracket for installing a photovoltaic panel through a leg component that is easily broken when hit.

2. A photovoltaic combiner box suitable for land maintenance sites according to claim 1, characterized in that: The connecting component includes a first ring sleeve arranged at the positive electrode access port or the negative electrode access port or the positive electrode outlet or the negative electrode outlet or the positive electrode plug interface or the negative electrode plug interface, a wire tube is slidably arranged in the first ring sleeve, and an electrical connection copper sleeve electrically connected to the copper core of the wires at both ends is arranged in the wire tube, a first circular ring cooperating with the first ring sleeve is arranged at the exposed end of the wire tube, a first spring driving the wire tube to be inserted into the first ring sleeve is connected between the first circular ring and the side wall of the cabinet, a second ring sleeve is arranged on the first circular ring, the inner diameter of the second ring sleeve is larger than the inner diameter of the wire tube, a plurality of first clamping strips evenly distributed in the circumferential direction are arranged at the end of the second ring sleeve, a first screw sleeve is threadedly connected to the second ring sleeve, and the first A conical surface cooperating with a first clamping strip is arranged in a screw sleeve, the inner end of the wire tube is threadedly connected with a third ring sleeve, a third circular ring cooperating with the end of the wire tube is arranged in the third ring sleeve, a plurality of second clamping strips are evenly arranged on the end of the third ring sleeve, a second screw sleeve is threadedly connected with the end of the second ring sleeve, a conical surface cooperating with the second clamping strip is arranged on the inner wall of the second screw sleeve, a second circular ring is arranged on the outer side of the third ring sleeve, a rotating sleeve is rotatably arranged on the second circular ring, a second pull rope connected to the switch lever of the first circuit breaker or the switch lever of the second circuit breaker or the switch lever of the third circuit breaker is arranged on the rotating sleeve, and a second spring is connected between the second circular ring and the inner wall of the cabinet.

3. A photovoltaic combiner box suitable for land maintenance sites according to claim 2, characterized in that: The rotating sleeve is provided with a third hanging ear, the third hanging ear is connected to a third hanging ring, the third hanging ring is connected to a fourth hanging ring through a second pull rope, the fourth hanging ring is connected to the fourth hanging ear on the clamping sleeve, and the clamping sleeve is fixed to the switch lever of the first circuit breaker, the switch lever of the second circuit breaker, or the switch lever of the third circuit breaker through a bolt sleeve.

4. A photovoltaic combiner box suitable for land maintenance sites according to claim 1, characterized in that: The air valve assembly includes a fourth ring sleeve arranged at the first air hole at the bottom of the cabinet, the lower end of the fourth ring sleeve is threadedly connected to a cover, a frustum is arranged around the bottom of the cover and matches the lower end of the fourth ring sleeve, the bottom of the cover is provided with a water absorption plug for filling the fourth ring sleeve, a plurality of second air holes connected to the bottom of the cover are evenly arranged on the side wall of the lower end of the cover, a water absorption strip is arranged in the third plug hole at the bottom of the cover, one end of the water absorption strip is buried in the water absorption plug, the other end of the water absorption strip is exposed and provided with a water absorption ball, the first air hole is threadedly connected to a third screw sleeve, and a waterproof and breathable membrane is arranged in the third screw sleeve.

5. A photovoltaic combiner box suitable for land maintenance sites according to claim 4, characterized in that: A soft sleeve is arranged on the outer side of the exposed part of the water absorbing strip.

6. A photovoltaic combiner box suitable for land maintenance sites according to claim 1, characterized in that: The cabinet is suspended below the photovoltaic panel with the assistance of two first pull ropes connected to the bracket at both sides of the upper end thereof.

7. A photovoltaic combiner box suitable for land maintenance sites according to claim 6, characterized in that: The upper and lower ends of the first pull rope are respectively connected to a first hanging ring and a second hanging ring, the first hanging ring is connected to a first hanging ear on the bracket, and the second hanging ring is connected to a second hanging ear on the cabinet.

8. The photovoltaic combiner box suitable for land maintenance sites according to claim 1, characterized in that: The bracket is fixed to a concrete cast-in-place pile in the sand by bolts. The concrete cast-in-place pile is cast in a cylindrical pit on the sand using a steel frame and concrete.

9. A photovoltaic combiner box suitable for land maintenance sites according to claim 1, characterized in that: The leg assembly is connected to a first leg and a second leg connected to the bottom of the cabinet by bolts, the upper end of the first leg is provided with a first disc, the upper edge of the first disc is provided with a first conical surface, the lower end surface of the first disc is provided with two first sockets that are 180 degrees apart in the circumference and connected to the first conical surface, the lower end of the second leg is provided with a second disc, the lower edge of the second disc is provided with a second conical surface, the upper end surface of the second disc is provided with two second sockets that are connected to the second conical surface and correspond one to one with the first sockets, two pull rods passing through the first socket and the second socket are connected between the first disc and the second disc, the pull rods are threadedly connected with a brittle nut that clamps the first disc and the second disc to each other and is easily broken under the action of external force, the upper end of the second leg is provided with a plug plate, the plug plate cooperates with the plug sleeve at the bottom of the cabinet, and a locking screw that cooperates with the plug plate is provided in the threaded hole on the plug sleeve.

10. A photovoltaic combiner box suitable for land maintenance sites according to claim 9, characterized in that: A positioning groove is provided in the middle of the upper end of the first disc, and a positioning pin matched with the positioning groove is provided at the lower end of the second disc.

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