Photovoltaic power generation ac grid-connected box easy to overhaul

Abstract

The present application relates to the technical field of AC grid-connected box, and discloses a photovoltaic power generation AC grid-connected box easy to overhaul, which comprises a back frame, a back plate is hingedly connected inside the back frame, a through hole for fixing devices through fasteners and a threading groove for wires to pass through are formed in the inside of the back plate, a magnet is fixed on the back of the back plate, a middle shell is hingedly connected at the outer periphery of the back plate at the front end of the back frame, a hole inner plate is arranged on one side of the front end of the back frame, a side groove is formed in the position of the hole inner plate at the rear end of the middle shell, an extension rod and a taper rod are sequentially installed in the inside of the side groove from top to bottom, and the taper rod is matched with the hole of the hole inner plate. The back plate is turned over by magnetic attraction, the middle shell is elastically locked, and the wiring structure is regular, so that the visual range of overhaul is widened, the disassembly and assembly process of the box body is simplified, the structural loss is reduced, the internal layout is regular, and the problems of inconvenient maintenance, complicated disassembly and assembly and easy operation failure of traditional equipment are effectively solved.

Description

Technical Field

[0001] This invention relates to the field of AC grid-connected box technology, specifically to an easy-to-maintain photovoltaic power generation AC grid-connected box. Background Technology

[0002] The photovoltaic power generation AC grid-connected box is an important supporting equipment in the photovoltaic power grid-connected system. It is mainly used to integrate the output power of photovoltaic modules and complete the AC grid-connected power distribution operation. It is widely used in various centralized and distributed photovoltaic power generation scenarios, providing basic equipment support for the stable grid-connected transmission of photovoltaic power.

[0003] Currently, most commercially available photovoltaic (PV) AC grid-connected boxes are equipped with built-in back panels and fixed structures. The back panels are mostly fixed, and the overall enclosure is highly sealed, resulting in limited space and poor visibility for maintenance of the hidden wiring at the back of the equipment, making maintenance difficult. Furthermore, existing grid-connected boxes often use bolt-locking structures for fixation, which easily causes structural wear during repeated disassembly and assembly. The overall disassembly and assembly process is cumbersome and labor-intensive. Additionally, the lack of a regular positioning structure for internal components and wiring makes it prone to tangled wiring and misaligned component placement. Long-term operation can easily lead to poor wiring contact, short circuits, and other faults, affecting the stability of the equipment. Therefore, a photovoltaic AC grid-connected box that is easy to maintain is proposed. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides an easy-to-maintain photovoltaic power generation AC grid-connected box, which solves the technical problems of existing grid-connected boxes with fixed back panels and enclosed boxes, resulting in a small visibility range for back wiring maintenance and difficult maintenance operations; traditional bolt-locking structures are cumbersome to disassemble and assemble, and repeated disassembly and assembly can easily cause structural damage; and the messy layout of internal components and wiring can easily induce equipment malfunctions.

[0005] To achieve the above objectives, the present invention provides the following technical solution: an easy-to-maintain photovoltaic power generation AC grid-connected box, comprising: The back frame has a back plate hinged to its interior. The back plate has through holes for fixing devices with fasteners and wire slots for wires to pass through. This structure can neatly install electrical devices on the surface of the back plate, while also directionally organizing and separating the wiring. This effectively avoids the situation of wires crossing and tangling, and messy device installation. It provides a neat working basis for subsequent equipment maintenance, device replacement and wiring tidying, and improves the standardization and rationality of the internal layout of the enclosure. A magnet is fixed on one side of the back panel, and the magnet is magnetically attracted to the back frame. The back panel is closed and positioned by magnetic attraction, without the need for additional cumbersome locking accessories. The opening and closing operation is flexible and effortless. At the same time, it can ensure that the back panel fits tightly with the back frame after closing, maintaining the integrity of the internal structure of the box, and making it easy to quickly open the back panel to inspect and maintain the hidden wiring on the back. The front end of the back frame is hinged to the outer periphery of the back plate, and a perforated inner plate is provided on one side of the front end of the back frame. The perforated inner plate is welded and fixed to the back frame. The rear end of the middle shell is provided with a side groove at the position of the perforated inner plate. A telescopic rod and a conical rod are installed in the side groove from top to bottom. The conical rod is adapted to the hole of the perforated inner plate. An elastic reset component is sleeved on the outside of the telescopic rod. The middle shell and the back frame are detachably fixed through the elastically fitted plug-in locking structure. It is easy to unlock and can automatically reset and lock after closing. The structure has strong stability and avoids the defects of traditional bolt fixing, which is time-consuming and laborious to disassemble and assemble, and is prone to stripping and damage. It greatly improves the convenience of opening and closing the box for maintenance. The front of the middle shell is hinged with a door panel, forming a double-layer opening and closing protective structure. The door panel can be opened separately for simple inspection, or the middle shell can be opened for in-depth maintenance. The layered opening mode is suitable for different operation and maintenance scenarios, taking into account both protection and maintenance convenience. The bottom of the back frame has equally spaced wire holes, which can make the wires pass into the box in a uniform and orderly manner, standardize the wiring position, reduce wire bending and pulling, improve the overall wiring regularity and the stability of the wiring connection, and at the same time make it easier to distinguish the wiring location, reducing the difficulty of later wiring inspection and repair.

[0006] Preferably, the perforations are evenly distributed in a rectangular array inside the back plate, and the perforations and the back plate are integrally formed, as are the wire grooves.

[0007] Preferably, the back plate has an inner hole on one side of its front end, and the inner hole is integrally formed with the back plate. A stud is provided inside the back frame at the corresponding position behind the inner hole, and the stud is welded and fixed to the back frame.

[0008] Preferably, a first perforated side plate is fixedly provided on the outer side of the door panel, and a second perforated side plate is fixedly provided on the outer side of the middle shell corresponding to the first perforated side plate.

[0009] Preferably, the holes in the first perforated side plate and the second perforated side plate are concentrically arranged for the padlock to pass through and lock.

[0010] Preferably, the threading hole is integrally formed with the back frame, and a sealing dustproof ring is coaxially built into the inside of the threading hole.

[0011] Preferably, the back frame is provided with hanging ears on both outer sides, and the hanging ears are welded and fixed to the back frame, and the hanging ears have holes inside.

[0012] Preferably, the front end of the door panel is provided with a transparent window, and the transparent window is fixed to the door panel.

[0013] Preferably, the top of the back frame is provided with a rain shield, and the rain shield is welded and fixed to the back frame.

[0014] Preferably, the threading grooves are formed on both sides and the bottom of the back plate, and the threading grooves are integrally formed with the back plate.

[0015] Compared with the prior art, the present invention provides a photovoltaic power generation AC grid-connected box that is easy to maintain and has the following beneficial effects: 1. This easily maintainable photovoltaic power generation AC grid-connected box features a hinged back panel and a magnetically attached back panel to the back frame, allowing for flexible flip-opening and closing of the back panel. This design exposes internal components and wiring in layers, providing a wide field of vision for maintenance and solving the problems of traditional grid-connected boxes with enclosed internal structures and difficult back panel maintenance. The hinged middle shell, with its internal telescopic rod, elastic reset component, and conical rod working in conjunction with a perforated inner plate, enables quick unlocking and automatic locking of the middle shell. This simplifies opening and closing and facilitates assembly and fixing, resolving the issues of cumbersome disassembly and assembly and high wear and tear on the fixing structure of traditional grid-connected boxes. Furthermore, the perforated back panel with wiring channels and wiring holes at the bottom of the back frame ensures standardized device installation and neat wiring, resulting in orderly internal wiring and stable device installation. This addresses the problems of messy wiring and irregular device positioning that can lead to operational malfunctions in traditional grid-connected boxes. Attached Figure Description

[0016] Figure 1 This is a perspective view of the overall structure of the present invention; Figure 2 This is a schematic diagram of the door panel in the open state according to the present invention; Figure 3 For the present invention Figure 2 Enlarged view of a portion of region A in the middle; Figure 4 This is a schematic diagram of the open state of the middle shell of the present invention.

[0017] In the diagram: 1. Back frame; 2. Middle shell; 3. Rain cover; 4. Back panel; 5. Perforation; 6. Wire channel; 7. Stud; 8. Inner hole; 9. Inner panel with perforation; 10. Side groove; 11. Telescopic rod; 12. Elastic reset component; 13. Conical rod; 14. Door panel; 15. First side panel with perforation; 16. Second side panel with perforation; 17. Hanging lug; 18. Wire hole; 19. Magnet. Detailed Implementation

[0018] This invention provides a technical solution: an easy-to-maintain photovoltaic power generation AC grid-connected box. Please refer to [link / reference]. Figure 1 , Figure 2 , Figure 3 and Figure 4 ,include: The back frame 1 has a back plate 4 hinged inside the back frame 1. The back plate 4 has through holes 5 for fixing the device by fasteners and through grooves 6 for wires to pass through. A magnet 19 is fixed on one side of the back of the back panel 4, and the magnet 19 is magnetically attracted to the back frame 1. The front end of the back frame 1 is hinged to the outer periphery of the back plate 4. A perforated inner plate 9 is provided on one side of the front end of the back frame 1, and the perforated inner plate 9 is welded and fixed to the back frame 1. A side groove 10 is provided at the rear end of the middle shell 2 at the position of the perforated inner plate 9. A telescopic rod 11 and a cone rod 13 are installed in the side groove 10 from top to bottom. The cone rod 13 is adapted to the hole of the perforated inner plate 9. An elastic reset member 12 is sleeved on the outside of the telescopic rod 11. The front of the middle shell 2 is hinged to a door panel 14; The bottom of the back frame 1 has equally spaced threading holes 18; The back frame 1 uses a hinged structure to allow the back panel 4 to be flexibly flipped open and closed. Fasteners pass through the through holes 5 to fix electrical components, and wires are neatly arranged in the wiring channels 6. Magnet 19 enables the back panel 4 to be magnetically closed, and the telescopic rod 11, in conjunction with the elastic reset component 12, drives the cone rod 13 to automatically reset and lock, completing the quick opening and closing assembly of the enclosure. The hinged magnetic structure of the back panel 4 allows for quick opening and closing without disassembling the entire enclosure, significantly reducing the difficulty of maintenance operations. The wiring channels 6 and through holes 5 standardize the layout of components and lines, and the elastic locking structure of the middle shell 2 facilitates easy disassembly and assembly, effectively improving the work efficiency of internal component maintenance and line maintenance of the grid-connected box, and adapting to the high-frequency maintenance needs of outdoor photovoltaic equipment.

[0019] Please see Figure 4 The perforations 5 are evenly distributed in a rectangular array inside the back plate 4, and the perforations 5 and the back plate 4 are integrally formed. The wire groove 6 is integrally formed with the back plate 4. The perforations 5 are uniformly and integrally molded in a rectangular array on the backplate 4. The hole diameter and spacing are standardized to accommodate the installation dimensions of various photovoltaic grid-connected electrical devices. After molding, there are no splicing gaps, allowing for stable fastener locking and fixing of devices. The rectangular array of integrally molded perforations 5 enables the orderly arrangement of multiple groups of electrical devices, avoiding messy and crowded device installation. The integrally molded structure has high strength and is not prone to deformation and cracking, ensuring the stability of device installation. At the same time, the standardized hole positions can be adapted to conventional devices, improving equipment versatility and assembly accuracy.

[0020] Please see Figure 2 , Figure 3 and Figure 4 An inner hole 8 is provided on one side of the front end of the back plate 4, and the inner hole 8 is integrally formed with the back plate 4. A stud 7 is provided inside the back frame 1 at the corresponding position behind the inner hole 8, and the stud 7 is welded and fixed to the back frame 1. The inner hole 8 is integrally formed on the front side of the back plate 4, and its diameter matches the outer diameter of the stud 7. The stud 7 is vertically welded and fixed to the corresponding position on the back frame 1. It can be locked to the stud 7 by bolts passing through the inner hole 8, thereby achieving reinforcement and limiting fixation of the back plate 4. The precise fit between the stud 7 and the inner hole 8 can provide secondary limiting fixation for the flip-open back plate 4, making up for the instability of magnetic fixation. This effectively avoids the back plate 4 shaking and shifting during equipment operation, prevents the lines from being pulled loose, and greatly improves the structural stability and safety of the grid-connected box during long-term operation.

[0021] Please see Figure 1 , Figure 2 and Figure 4 A first perforated side plate 15 is fixedly provided on the outer side of the door panel 14, and a second perforated side plate 16 is fixedly provided on the outer side of the middle shell 2 corresponding to the first perforated side plate 15. The first perforated side plate 15 and the second perforated side plate 16 are vertically fixed to the same position on the outer side of the door panel 14 and the middle shell 2, respectively. The plates are made by stamping, with a flat surface and regular holes, and are welded and fixed to the corresponding shell without any loose gaps. The separate first perforated side plate 15 and the second perforated side plate 16 have a simple structure and are firmly installed, providing a stable mounting base for locking the enclosure. Compared with the integrated lock hole structure, the separate structure has more even stress distribution, is less prone to deformation and damage, and is suitable for long-term locking and protection needs under complex outdoor working conditions.

[0022] The holes in the first perforated side plate 15 and the second perforated side plate 16 are concentrically arranged for the padlock to pass through and lock. The holes on the first perforated side plate 15 and the second perforated side plate 16 are precisely coaxially aligned, with uniform hole diameters to match the dimensions of standard anti-theft padlock shanks. When the door panel 14 is closed, the two holes completely overlap, allowing for direct insertion of a padlock for locking. The concentrically positioned holes enable quick and easy padlock installation and locking, ensuring a simple and convenient operation. This effectively locks the door panel 14 to the middle shell 2, preventing unauthorized opening of the enclosure. It prevents accidental contact, damage, or theft of internal electrical components and wiring, ensuring the safe operation of the photovoltaic grid-connected equipment and providing extremely strong protection.

[0023] Please see Figure 4 The wire hole 18 is integrally formed with the back frame 1, and a sealing dustproof ring is coaxially built into the inside of the wire hole 18; The wiring hole 18 is integrally formed at the bottom of the back frame 1. A matching elastic sealing dustproof ring is coaxially nested inside the hole. The dustproof ring fits tightly against the hole wall and the outer wall of the wire, accommodating photovoltaic connection wires of different thicknesses, achieving complete sealing of gaps. The integrally formed wiring hole 18 has a stable structure and is not easily damaged. Combined with the built-in sealing dustproof ring, it can completely seal any gaps after the wires are installed. This effectively prevents outdoor dust, rainwater, and moisture from entering the enclosure, avoiding short circuits and dust accumulation malfunctions caused by moisture, significantly improving the grid-connected enclosure's adaptability to outdoor environments and extending its service life.

[0024] Please see Figure 1 , Figure 2 and Figure 4 The back frame 1 has hanging ears 17 on both sides of its exterior, and the hanging ears 17 are welded and fixed to the back frame 1. The hanging ears 17 have holes inside. Two sets of mounting ears 17 are symmetrically welded and fixed to the left and right sides of the back frame 1. The mounting ears 17 are made of thickened metal sheet with a standard mounting hole in the center, which is centrally located to accommodate expansion screws, fixing bolts, and other conventional mounting fasteners. The symmetrically arranged mounting ears 17 on both sides distribute the force evenly, and the thickened welded structure has strong load-bearing capacity, which can stably fix the grid-connected box to the wall, bracket, or other mounting carriers. The installation method is simple and universal, and the fixation is firm and not easy to fall off, making it suitable for various photovoltaic equipment installation scenarios such as outdoor high-altitude and open-air installations.

[0025] A window is provided at the front end of the door panel 14, and the window is fixed to the door panel 14; The viewing window is made of high-strength, transparent, and explosion-proof material. It is installed in the pre-reserved window position at the front of door panel 14 using an embedded fixing process. The edges are sealed and reinforced, ensuring a tight fit with door panel 14 without loosening or water leakage. The viewing window at the front of door panel 14 allows for direct observation of the internal components' operating status and indicator light status without opening the enclosure, facilitating quick equipment inspection by staff. This eliminates the need for frequent opening of the enclosure, reducing wear and tear from opening and closing, significantly improving daily inspection efficiency, and reducing maintenance workload.

[0026] A rain shield 3 is provided on the top of the back frame 1, and the rain shield 3 is welded and fixed to the back frame 1; The rain shelter 3 is made of a single piece of waterproof sheet metal, bent to form a shape that covers the entire top of the back frame 1. Its edges extend outwards beyond the side walls of the enclosure, and it is fixed to the top of the back frame 1 using a full welding process, with the welds sealed for waterproofing. This integrated rain shelter 3 provides all-around protection against rain, frost, snow, fallen leaves, and other debris, preventing rainwater from seeping into the enclosure and preventing debris accumulation from corroding the equipment. It is effectively suitable for outdoor installation scenarios, providing all-weather protection for the grid-connected box and eliminating electrical faults caused by rain.

[0027] The wire-passing groove 6 is formed on both sides and bottom of the back plate 4, and the wire-passing groove 6 is integrally formed with the back plate 4; The cable trays 6 are integrally molded and located on the left, right, and bottom sides of the back panel 4. The trays have uniform depth and width, and smooth, burr-free walls. They can neatly store and guide various connecting wires, adapting to the conventional wiring layout of the grid-connected box. The multi-directional cable trays 6 comprehensively organize the wiring inside the box, neatly storing the wires in sections, preventing tangles, knots, and mess. This improves the cleanliness of the box's interior, prevents wire crushing and wear, and short circuits, while also facilitating future wire inspection, organization, and replacement.

[0028] This solution: The photovoltaic power generation AC grid-connected box adopts a split-opening and zoned maintenance structure design, which can realize quick opening of the box, component inspection and maintenance, and orderly maintenance of the line, adapting to the convenient operation and maintenance needs of outdoor photovoltaic equipment. During routine maintenance and component replacement, the staff first removes the anti-theft padlocks that pass through the holes of the first perforated side plate 15 and the second perforated side plate 16, releases the locking limit of the door panel 14, and flips the door panel 14 outward to fully expose the internal structure of the middle shell 2. Then, the staff manually pushes the cone rod 13 upward to compress the elastic reset part 12 outside the telescopic rod 11, so that the cone rod 13 moves upward and disengages from the limiting hole of the perforated inner plate 9, releasing the fixing locking structure between the middle shell 2 and the back frame 1. At this time, the middle shell 2 can be flipped forward to fully expose the back plate 4 and various electrical components installed on the front. The staff can directly disassemble, replace and debug damaged or faulty components on the front of the back plate 4. There is ample operating space, making maintenance convenient and efficient.

[0029] When it is necessary to repair, troubleshoot, or rewire the hidden wiring on the back of the back panel 4 and the inside of the back frame 1, the staff can gently pull the back panel 4 forward. The applied pulling force overcomes the magnetic attraction between the magnet 19 and the back frame 1, causing the back panel 4 to flip forward and open around the hinge position. If the equipment needs to be reinforced and limited after long-term operation to prevent the back panel 4 from shaking, it can be locked and fixed by bolts through the inner hole 8 of the back panel 4 and the studs 7 of the back frame 1. When inspecting the wiring on the back, the bolts can be rotated and removed with the help of tools to release the locking limit between the inner hole 8 and the studs 7, which can completely expose the entire wiring structure inside the back frame 1. This makes it convenient for the staff to sort, correct, replace, and organize the hidden wires, completely solving the problems of cumbersome maintenance and poor visibility of the wiring on the back of the traditional grid-connected box.

[0030] During normal wiring and operation, the external photovoltaic connection wires are inserted into the enclosure from bottom to top. First, they pass through the integrated wiring hole 18 at the bottom of the back frame 1. A sealing dustproof ring, coaxially positioned inside the wiring hole 18, tightly wraps the outer wall of the wire, effectively sealing any gaps and preventing the intrusion of outdoor dust, rain, and moisture. After entering the back frame 1, the wires are neatly arranged and guided along the wiring grooves 6 on both sides and the bottom of the back panel 4, avoiding tangled wiring. Finally, they are stably connected and conductive with the electrical components on the front of the back panel 4, which are fixed to the rectangular array through-holes 5 by fasteners. This enables AC grid-connected transmission of photovoltaic power. The overall wiring is neat, provides good protection, and is easy to maintain.

Claims

1. A photovoltaic power generation AC grid-connected box that is easy to maintain, characterized in that, include: The back frame (1) has a back plate (4) hinged inside. The back plate (4) has through holes (5) for fixing the device by fasteners and through grooves (6) for wires to pass through. A magnet (19) is fixed on one side of the back of the back plate (4), and the magnet (19) is magnetically attracted to the back frame (1). The front end of the back frame (1) is hinged to the outer periphery of the back plate (4) with a middle shell (2). A perforated inner plate (9) is provided on one side of the front end of the back frame (1), and the perforated inner plate (9) is welded and fixed to the back frame (1). A side groove (10) is provided at the rear end of the middle shell (2) at the position of the perforated inner plate (9). A telescopic rod (11) and a cone rod (13) are installed in the side groove (10) from top to bottom. The cone rod (13) is adapted to the hole of the perforated inner plate (9). An elastic reset member (12) is sleeved on the outside of the telescopic rod (11). The front of the middle shell (2) is hinged to a door panel (14). The bottom of the back frame (1) is provided with equally spaced threading holes (18).

2. The easily maintainable photovoltaic power generation AC grid-connected box according to claim 1, characterized in that: The perforations (5) are evenly distributed in a rectangular array inside the back plate (4), and the perforations (5) and the back plate (4) are integrally formed. The wire groove (6) and the back plate (4) are integrally formed.

3. The easily maintainable photovoltaic power generation AC grid-connected box according to claim 1, characterized in that: The back plate (4) has an inner hole (8) on one side of its front end, and the inner hole (8) is integrally formed with the back plate (4). The back frame (1) is provided with a stud (7) at the corresponding position behind the inner hole (8), and the stud (7) is welded and fixed to the back frame (1).

4. The easily maintainable photovoltaic power generation AC grid-connected box according to claim 1, characterized in that: A first perforated side plate (15) is fixed on the outer side of the door panel (14), and a second perforated side plate (16) is fixed on the outer side of the middle shell (2) corresponding to the first perforated side plate (15).

5. A photovoltaic power generation AC grid-connected box that is easy to maintain according to claim 4, characterized in that: The holes of the first perforated side plate (15) and the second perforated side plate (16) are concentrically arranged for the padlock to pass through and lock.

6. The easily maintainable photovoltaic power generation AC grid-connected box according to claim 1, characterized in that: The threading hole (18) is integrally formed with the back frame (1), and a sealing dustproof ring is coaxially built into the inside of the threading hole (18).

7. The easily maintainable photovoltaic power generation AC grid-connected box according to claim 1, characterized in that: The back frame (1) is provided with hanging ears (17) on both sides of the outside, and the hanging ears (17) are welded and fixed to the back frame (1). The hanging ears (17) have holes inside.

8. A photovoltaic power generation AC grid-connected box that is easy to maintain according to claim 1, characterized in that: The front end of the door panel (14) is provided with a window, and the window is fixed to the door panel (14).

9. A photovoltaic power generation AC grid-connected box that is easy to maintain according to claim 1, characterized in that: The top of the back frame (1) is provided with a rain shield (3), and the rain shield (3) is welded and fixed to the back frame (1).

10. A photovoltaic power generation AC grid-connected box that is easy to maintain according to claim 1, characterized in that: The threading groove (6) is provided on both sides and bottom of the back plate (4), and the threading groove (6) is integrally formed with the back plate (4).

Images