Switching dual power supply distribution box for smart grid

Abstract

The application discloses a switching type dual-power supply power distribution box for smart grids, and relates to the technical field of power distribution boxes.The first box body is internally slidably connected with a second box body, and the inner sides of the first box body and the second box body are fixedly connected with a connecting frame; and the inner sides of the first box body and the second box body are respectively provided with two and one limiting sliding grooves.The dynamic shielding mechanism is arranged, so that when the equipment needs to be overhauled, the second box body is accommodated into the first box body by winding the connecting rope, and the shielding net is synchronously linked to be folded and accommodated; the linkage between the box body movement and the shielding net folding is realized, the interference of the shielding net on the overhaul is avoided, the space occupation is reduced, the structure is more compact, the circuit device in the box can be completely exposed, and the convenience of the overhaul operation and the operation space are greatly improved.

Description

Technical Field

[0001] This invention relates to the field of distribution box technology, specifically a switching dual-power supply distribution box for smart grids. Background Technology

[0002] With the rapid advancement of smart grid construction, the requirements for power supply continuity, operational safety, and electromagnetic compatibility of power distribution systems are continuously increasing. As a core terminal device in the power distribution link of smart grids, the switchable dual-power supply distribution box is widely used in industrial and mining enterprises, high-rise buildings, data centers, and other scenarios with stringent requirements for power supply reliability. It undertakes the core functions of automatic switching between dual power sources, power distribution protection, and power allocation. Its operational stability directly determines the power supply safety of downstream electrical loads.

[0003] In existing technologies, switching dual-power supply distribution boxes for smart grids mostly adopt fixed electromagnetic shielding schemes. This involves fixing an integrated metal shielding mesh or metal shielding plate inside the box to achieve electromagnetic isolation between the high-voltage circuits and the low-voltage control circuits. However, this type of fixed shielding scheme cannot adaptively adjust its shielding performance according to the dynamic changes in grid load current. Under peak electricity demand and high current conditions, it exhibits significant shortcomings in shielding capability in the face of strong electromagnetic interference. The resulting electromagnetic leakage will emit electromagnetic interference signals into the grid lines and surrounding space through both conduction and radiation coupling paths, leading to a series of problems such as increased harmonic pollution and deteriorated power quality in the distribution network, seriously affecting the safe and stable operation of the distribution system. To address these industry pain points and technical defects in existing technologies, this invention provides a switching dual-power supply distribution box for smart grids, aiming to fundamentally solve the aforementioned technical problems. Summary of the Invention The purpose of this invention is to address the problem that the fixed electromagnetic shielding of existing dual-power distribution boxes cannot dynamically adjust its shielding performance according to the load current, resulting in insufficient shielding capability under high current and strong interference conditions, thus causing electromagnetic leakage, harmonic pollution of the power distribution network, and deterioration of power quality. This invention provides a switching dual-power distribution box for smart grids.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a switching dual-power supply distribution box for smart grids, comprising: a first box, a second box slidably connected to the inner side of the first box, a connecting frame fixedly connected to the inner side of both the first box and the second box, two and one limiting slide grooves respectively opened on the inner side of the first box and the second box, and a sliding frame slidably connected to the inner side of each limiting slide groove, and a shielding mesh fixedly connected between adjacent connecting frames and between adjacent connecting frames and sliding frames; and a dynamic shielding mechanism disposed on the inner side of the first box, used to respond to current increases. To enhance the shielding effect against the magnetic field generated by the current, the dynamic shielding mechanism includes a rectangular groove formed inside the second housing, a first connecting plate slidably connected to the inner side of the rectangular groove, an isolation plate fixedly connected to the inner side of the first housing, and the isolation plate fixedly connected to a shielding mesh. Multiple second connecting plates are provided between the first connecting plate and the isolation plate, and a second metal mesh is fixedly disposed between each second connecting plate, the second connecting plate, the first connecting plate, and the isolation plate. A dynamic adaptation mechanism is also included, disposed inside the second housing, for dynamically adapting to changes in the second metal mesh.

[0005] As a further embodiment of the present invention: the dynamic shielding mechanism further includes two first barrier plates disposed on the top of the second metal mesh, and the two first barrier plates are respectively fixedly connected to two of the adjacent first connecting plates, second connecting plates or isolation plates, wherein a second barrier plate is slidably connected between the two first barrier plates, and a sliding component is disposed at the bottom of the second barrier plate.

[0006] As a further embodiment of the present invention: the sliding assembly includes a first telescopic plate slidably connected to the bottom of the first barrier plate, a second telescopic plate slidably connected between the two first telescopic plates, a third telescopic plate fixedly connected to the bottom of the first telescopic plate, a fourth telescopic plate slidably connected between the two third telescopic plates, and the second metal mesh sliding on the inner side of the third telescopic plate, the third telescopic plate being slidably connected to the inner side of the first connecting plate, and a rotating assembly being provided on the inner side of the second metal mesh.

[0007] As a further embodiment of the present invention: the rotating assembly includes a first metal mesh sheet slidably connected to the inner side of the second metal mesh sheet. Both the first metal mesh sheet and the second metal mesh sheet are composed of multiple rotating units. Each rotating unit includes four rotating plates and a rotating shaft, and the four rotating plates are respectively rotatably connected to the rotating shaft.

[0008] As a further embodiment of the present invention: the rotating assembly further includes a sliding groove formed inside the first connecting plate, the isolation plate or the second connecting plate, a sliding strip is slidably connected to the inner side of the sliding groove, and the first metal mesh is fixedly connected to the sliding strip, and a driving assembly is provided on one side of the first connecting plate.

[0009] As a further embodiment of the present invention: the driving assembly includes a fixing block fixedly connected to one side of the first connecting plate, a connecting seat fixedly connected to the inner side of the first housing, a driving motor installed on one side of the connecting seat, a rotating rod rotatably connected to the inner side of the connecting seat, and the output end of the driving motor fixedly connected to the rotating rod, a connecting rope wound around the outer wall of the rotating rod, and one end of the connecting rope fixedly connected to the fixing block.

[0010] As a further embodiment of the present invention: the drive assembly further includes a mounting groove formed inside the second housing. A plurality of second tension springs are installed between the first connecting plate and the inner wall of the mounting groove. A set of rectangular blocks is fixedly connected to one side of the first connecting plate, the isolation plate, and the second connecting plate. Each set of rectangular blocks has two blocks. Except for the last set, a cylinder is fixedly connected to one side of each rectangular block. A sliding column is slidably connected to the inner side of the cylinder. A first tension spring is installed between the sliding column and the inner side of the cylinder, and the elastic coefficient of the first tension spring decreases from left to right. One end of the sliding column is fixedly connected to an adjacent rectangular block.

[0011] As a further embodiment of the present invention: the dynamic adaptation mechanism includes a first telescopic rod slidably connected to the inner side of the first connecting plate, a return spring installed between the inner side of the first connecting plate and the first telescopic rod, a driving block fixedly connected to the inner side of the mounting groove, an inclined surface provided on one side of the driving block, and a spherical rod fixedly connected to one side of the first telescopic rod.

[0012] As a further embodiment of the present invention: the dynamic adaptation mechanism further includes a second telescopic rod slidably connected to the inner side of the first telescopic rod, a third telescopic rod slidably connected to the inner side of the second telescopic rod, and a fourth telescopic rod slidably connected to the inner side of the third telescopic rod, and the four first metal mesh pieces are respectively fixedly connected to the top of the first telescopic rod, the second telescopic rod, the third telescopic rod, or the fourth telescopic rod.

[0013] Compared with the prior art, the beneficial effects of the present invention are: 1. By setting up a dynamic shielding mechanism, when equipment malfunctions and needs maintenance, the second box is moved into the first box by the winding connecting rope, and the shielding net is folded and stored in sync. This design realizes the linkage between the movement of the box and the folding of the shielding net, which not only avoids the interference of the shielding net with maintenance and reduces space occupation to make the structure more compact, but also allows the internal circuit devices to be fully exposed, greatly improving the convenience of maintenance operations and working space. 2. By coordinating components such as the first metal mesh, and using spring rebound to shift the metal mesh, it is staggered with the original shielding mesh, reducing the gap and thus improving the electromagnetic shielding effect. This structure can significantly reduce magnetic field interference generated by high-voltage electricity, preventing signal interference or equipment malfunction in weak-voltage areas. Simultaneously, it can automatically adjust the shielding structure according to the power load and current magnitude, achieving dynamic protection on demand where the shielding effect increases with the current. 3. By setting up the first tension spring and other parts, when the first connecting plate stretches the metal mesh, the force and moving distance of each second connecting plate are gradually reduced. With the fixed isolation plate, the uniform stretching and displacement of the multi-layer metal mesh is achieved, avoiding local offset, jamming or excessive deformation of the mesh, and making the shielding gap shrink synchronously and uniformly, effectively improving the stability of magnetic field shielding and the reliability of electromagnetic interference resistance. 4. By setting a dynamic adaptation mechanism, when the first connecting plate moves to the left, it synchronously drives the first telescopic rod to move in the same direction. Under the synergistic effect of the inclined guide limit of the drive block and the elastic reset force of the reset spring, the first telescopic rod drives the first metal mesh to feed towards the shielding mesh, and completes the nesting and shrinking with the second metal mesh. This linkage structure can simultaneously achieve the dual shielding gain of mesh misalignment and diameter reduction and waveguide effective depth enhancement under strong electromagnetic interference conditions, greatly improving the electromagnetic shielding attenuation of the target interference frequency band, and the shielding performance far exceeds the grid access technical requirements of power grid distribution equipment. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a cross-sectional view of the present invention; Figure 3 This is a schematic diagram of the dynamic shielding mechanism of the present invention; Figure 4 This is a partial structural diagram of the dynamic shielding mechanism of the present invention; Figure 5 This is a cross-sectional view of the dynamic shielding mechanism of the present invention; Figure 6 This is a schematic diagram of the first barrier plate structure of the present invention; Figure 7 This is a schematic diagram of the dynamic adaptation mechanism structure of the present invention; Figure 8This is a partial structural diagram of the dynamic adaptation mechanism of the present invention; Figure 9 This is a partial cross-sectional view of the dynamic adaptation mechanism of the present invention; Figure 10 This is a schematic diagram of the first connecting plate structure of the present invention; Figure 11 This is a schematic diagram of the first telescopic rod structure of the present invention.

[0015] In the diagram: 1. First housing; 2. Second housing; 3. Isolation plate; 4. Shielding mesh; 5. First tension spring; 6. Connecting frame; 7. Sliding frame; 8. Limiting groove; 9. Sliding column; 10. Connecting seat; 11. Drive motor; 12. Rotating rod; 13. Connecting rope; 14. Fixing block; 15. Rectangular groove; 16. First connecting plate; 17. First barrier plate; 18. Second barrier plate; 19. Cylinder; 20. Second connecting plate; 21. 21. First metal mesh sheet; 22. Second metal mesh sheet; 23. Sliding groove; 24. Sliding bar; 25. Second tension spring; 26. Mounting groove; 27. Drive block; 28. First telescopic rod; 29. ​​Rectangular block; 30. Return spring; 31. Ball rod; 32. Second telescopic rod; 33. Third telescopic rod; 34. Fourth telescopic rod; 35. First telescopic plate; 36. Second telescopic plate; 37. Third telescopic plate; 38. Fourth telescopic plate. Detailed Implementation

[0016] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0017] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. In the description of this invention, it should be noted that unless otherwise explicitly specified and limited, the terms "installed," "connected," "linked," and "set up" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances. The following describes embodiments of the invention based on its overall structure.

[0018] Please see Figures 1 to 11 This embodiment provides a switching dual-power supply distribution box for smart grids, comprising: A first housing 1 is slidably connected to a second housing 2. A connecting frame 6 is fixedly connected to the inner sides of both the first housing 1 and the second housing 2. Two and one limiting slide groove 8 are respectively opened on the inner sides of the first housing 1 and the second housing 2. A sliding frame 7 is slidably connected to the inner side of each limiting slide groove 8. A shielding mesh 4 is fixedly connected between adjacent connecting frames 6 and between adjacent connecting frames 6 and sliding frames 7. A dynamic shielding mechanism is located inside the first housing 1 to enhance the shielding effect on the magnetic field generated by the current when the current increases. This dynamic shielding mechanism includes a rectangular groove 15 opened inside the second housing 2. A first connecting plate 16 is slidably connected to the inner side of the rectangular groove 15. An isolation plate 3 is fixedly connected to the inner side of the first housing 1, and the isolation plate 3 is fixedly connected to a shielding mesh 4. Multiple second connecting plates 20 are provided between the first connecting plate 16 and the isolation plate 3. Each second connecting plate 20 is connected to the first connecting plate 20 and the first connecting plate 20. 16. A second metal mesh 22 is fixedly installed between each of the isolation plates 3; the dynamic shielding mechanism also includes two first barrier plates 17 installed on the top of the second metal mesh 22, and the two first barrier plates 17 are fixedly connected to two of the adjacent first connecting plates 16, second connecting plates 20 or isolation plates 3 respectively, wherein a second barrier plate 18 is slidably connected between the two first barrier plates 17, and a sliding component is provided at the bottom of the second barrier plate 18; the sliding component includes a first telescopic plate 35 slidably connected to the bottom of the first barrier plate 17, a second telescopic plate 36 slidably connected between the two first telescopic plates 35, a third telescopic plate 37 fixedly connected to the bottom of the first telescopic plate 35, a fourth telescopic plate 38 slidably connected between the two third telescopic plates 37, and the second metal mesh 22 slides on the inner side of the third telescopic plate 37, the third telescopic plate 37 is slidably connected to the inner side of the first connecting plate 16, and a rotating component is provided on the inner side of the second metal mesh 22; The first telescopic plate 35 and the third telescopic plate 37 are rigidly fixed. The two third telescopic plates 37 are slidably connected by a fourth telescopic plate 38, forming a lower limiting frame that extends and retracts synchronously with the upper frame. The second metal mesh 22 and the first metal mesh 21 are slidably nested inside the lower frame. The left-right and up-down degrees of freedom of the mesh are completely limited, leaving only the left-right sliding required for stretching and the forward-backward sliding required for nesting feed. The bottom of the first barrier plate 17 is provided with a first connecting groove, and the first telescopic plate 35 is slidably connected to the bottom of the first connecting groove. The entire stroke of the mesh is precisely guided by the telescopic frame. No matter how large the stretching stroke or how deep the feed depth, the mesh always remains flat and uniform, without any deviation, warping, or jamming. This ensures the uniformity of the mesh stretching, avoids magnetic leakage caused by local mesh enlargement, and significantly improves the operational reliability and service life of the mechanism. The drive motor 11 is controlled by a PLC controller and can be started intermittently. When a fault occurs inside the device and maintenance is required, the PLC controller starts the drive motor 11, causing its output to rotate clockwise. This rotates the rotating rod 12 and winds up the connecting rope 13, which in turn pulls the fixed block 14 towards the drive motor 11. This causes the first connecting plate 16 and the second housing 2 to move synchronously, allowing the second housing 2 to be housed inside the first housing 1, exposing the internal circuitry of the first housing 1 for easy maintenance. (A shielding mesh 4 is fixedly connected between adjacent connecting frames 6 and between connecting frames 6 and sliding frames 7, forming a retractable flexible shielding structure similar to a folding screen. When the second housing 2 is housed inside the first housing 1, the connecting frame 6 fixed inside the second housing 2 will move synchronously towards the connecting frame 6 inside the first housing 1. During the movement, the connecting frame 6 pulls the shielding mesh 4, causing the sliding frame 7 to move along the limiting groove 8.) Directional sliding allows the originally unfolded shielding mesh 4 to fold and retract completely to the side of the enclosure 1 as the enclosure is retracted. Simultaneously, the movement of the second enclosure 2 drives multiple connecting frames 6 to move, achieving the folding and retraction of the shielding mesh 4. This structure achieves coordinated movement between the enclosure and the shielding mesh, preventing the shielding mesh 4 from interfering with maintenance operations. (Traditional distribution box electromagnetic shielding meshes are rigidly installed using screws and welding, with their relative positions to the enclosure and internal components completely fixed. During maintenance, they are always within the core operating space, inevitably creating physical obstruction. Manual disassembly is required to remove them, a persistent problem in the industry.) The shielding mesh 4 is not fixed to the maintenance operating surface but is installed through a multi-point movable structure. Shielding mesh 4 is fixedly connected between adjacent connecting frames 6 and between connecting frames 6 and sliding frames 7, forming an accordion-like structure. The multi-segment, retractable, and fully foldable flexible structure of the folding screen inherently possesses a dual-state capability of "unfolding for shielding during operation and folding for storage during maintenance," thus eliminating the interference problem that fixed structures cannot avoid from a structural perspective. It also reduces space occupation, making the overall structure more compact and orderly. At the same time, the automatic storage of the second cabinet 2 is achieved through motor drive, allowing the internal circuit devices to be fully exposed, which greatly improves the convenience of maintenance operations and working space.

[0019] Please see Figures 2-9This embodiment provides a switching dual-power supply distribution box for smart grids. The rotating assembly includes a first metal mesh 21 slidably connected to the inner side of a second metal mesh 22. Both the first metal mesh 21 and the second metal mesh 22 are composed of multiple rotating units. Each rotating unit includes four rotating plates and a rotating shaft, and the four rotating plates are rotatably connected to the rotating shaft. The rotating assembly also includes a sliding groove 23 formed inside the first connecting plate 16, the isolation plate 3, or the second connecting plate 20. A sliding strip 24 is slidably connected to the inner side of the sliding groove 23, and the first metal mesh 21 is fixedly connected to the sliding strip 24. A driving assembly is provided on one side of the first connecting plate 16. The driving assembly includes a fixing block 14 fixedly connected to one side of the first connecting plate 16. A connecting seat 10 is fixedly connected to the inner side of the first housing 1. A drive motor 11 is installed on one side of the connecting seat 10. A rotating rod 12 is rotatably connected, and the output end of the drive motor 11 is fixedly connected to the rotating rod 12. A connecting rope 13 is wound around the outer wall of the rotating rod 12, and one end of the connecting rope 13 is fixedly connected to the fixing block 14. The drive assembly also includes a mounting groove 26 opened inside the second housing 2. Multiple second tension springs 25 are installed between the first connecting plate 16 and the inner wall of the mounting groove 26. A set of rectangular blocks 29 are fixedly connected to one side of the first connecting plate 16, the isolation plate 3, and the second connecting plate 20. Each set of rectangular blocks 29 has two blocks. Except for the last set, a cylinder 19 is fixedly connected to one side of each rectangular block 29. A sliding column 9 is slidably connected to the inner side of the cylinder 19. A first tension spring 5 is installed between the sliding column 9 and the inner side of the cylinder 19, and the elastic coefficient of the first tension spring 5 decreases from left to right. One end of the sliding column 9 is fixedly connected to an adjacent rectangular block 29. The inner side of the third telescopic plate is provided with a second connecting groove, and the second metal mesh 22 slides inside the second connecting groove. In the initial state, multiple second tension springs 25 are in a stretched state, and the internal space of the first housing 1 is divided into a high-voltage area and a low-voltage area. The two areas are separated and shielded by a shielding mesh 4. When the power consumption of the distribution cabinet increases, the current in the high-voltage area increases accordingly, which will generate strong electromagnetic interference. At this time, the PLC controller controls the drive motor 11 to start, driving the rotating rod 12 to rotate and complete the release action. Under the elastic force of multiple second tension springs 25, the first connecting plate 16 is pulled to the left, thereby stretching the first metal mesh 21 and the second metal mesh 22, so that the two are misaligned with the adjacent shielding mesh 4, reducing the size of the shielding mesh 4. The gap between the two layers of metal mesh (the first metal mesh 21, the second metal mesh 22, and the shielding mesh 4 are arranged in parallel and staggered manner. In the initial state, the three layers of mesh are aligned, and the equivalent mesh size is the largest. When the current increases and the first connecting plate 16 moves to the left, it causes the first metal mesh 21 and the second metal mesh 22 to be relatively misaligned with the shielding mesh 4, dividing the original single large mesh into multiple smaller equivalent meshes. The larger the current, the larger the misalignment, the smaller the equivalent mesh size, and the stronger the cutoff and attenuation effect on low-frequency strong magnetic fields), thereby improving the shielding effect on the magnetic field of the strong electric area. This structure can significantly reduce the magnetic field interference generated by strong electric current by reducing the gap between the multiple layers of shielding mesh and forming staggered shielding, avoiding signal interference or abnormal equipment operation in the weak electric area. At the same time, it can automatically adjust the shielding structure according to the power load and current size, realizing dynamic protection on demand with stronger shielding effect as the current increases. Meanwhile, during the stretching of the first metal mesh 21 and the second metal mesh 22, the first connecting plate 16 can simultaneously drive the second connecting plate 20 to move towards itself. Since the elastic coefficient of the first tension spring 5 decreases in stages, the force on the second connecting plate 20 closer to the right is smaller, and the corresponding movement distance is also smaller. With the fixed isolation plate 3, all the first metal mesh 21 and the second metal mesh 22 can achieve uniform stretching and displacement, effectively improving the stability of the magnetic field shielding. This structure achieves graded force through springs with decreasing elastic coefficients, allowing the movement distance of each second connecting plate 20 to decrease step by step, ensuring uniform and consistent stretching of the multi-layer metal mesh, and avoiding local offset, jamming, or excessive deformation. The uniform displacement of the mesh can synchronously reduce the overall shielding gap, and the magnetic field shielding is evenly distributed throughout the area, eliminating local shielding weaknesses and further improving the reliability of electromagnetic interference resistance.

[0020] Please see Figures 4 to 11This embodiment provides a switching dual-power supply distribution box for smart grids, with a dynamic adaptation mechanism. The dynamic adaptation mechanism is located inside the second box 2 and is used to dynamically adapt to changes in the second metal mesh 22. The dynamic adaptation mechanism includes a first telescopic rod 28 slidably connected to the inside of the first connecting plate 16. A return spring 30 is installed between the inside of the first connecting plate 16 and the first telescopic rod 28. A driving block 27 is fixedly connected to the inside of the mounting groove 26. An inclined surface is provided on one side of the driving block 27. A ball rod 31 is fixedly connected to one side of the first telescopic rod 28. The dynamic adaptation mechanism also includes a second telescopic rod 32 slidably connected to the inside of the first telescopic rod 28. A third telescopic rod 33 is slidably connected to the inside of the second telescopic rod 32. A fourth telescopic rod 34 is slidably connected to the inside of the third telescopic rod 33. The four first metal meshes 21 are respectively fixedly connected to the top of the first telescopic rod 28, the second telescopic rod 32, the third telescopic rod 33, or the fourth telescopic rod 34. When the first connecting plate 16 moves to the left, it will synchronously drive the first telescopic rod 28 to move to the left as well. Simultaneously, under the combined action of the guide limit of the single-sided inclined surface of the drive block 27 and the elastic reset force of the reset spring 30, the first telescopic rod 28 is pulled and fed towards the shielding mesh 4, thereby driving the first metal mesh 21 to move synchronously towards the shielding mesh 4, so that the first metal mesh 21 completes the nesting and contraction towards the inside of the second metal mesh 22. This linkage structure can withstand strong electromagnetic interference conditions. (The mesh of the traditional planar metal shielding mesh is a two-dimensional planar through hole, which has almost no waveguide cutoff effect for extremely low frequency magnetic fields, has extremely high leakage magnetic field, and extremely poor shielding effectiveness; while when the planar mesh forms a metal waveguide structure with axial depth, as long as the waveguide cutoff frequency is much higher than the frequency of the interfering magnetic field, it can produce a very strong attenuation effect on the low frequency magnetic field, and the attenuation increases exponentially with the increase of the waveguide depth.) When the first telescopic rod 28 approaches the shielding mesh 4, it will drive the first metal mesh 21 to move towards the shielding mesh 4. Synchronously fed, it is inserted into the inner side of the second metal mesh 22, forming a nested fit with the second metal mesh 22 and the basic shielding mesh 4. The original two-dimensional planar mesh is directly converted into a three-dimensional waveguide structure with axial depth. The closer the first telescopic rod 28 is to the shielding mesh 4, the deeper the mesh nesting depth and the greater the effective waveguide depth. The attenuation of the low-frequency strong magnetic field of power frequency is greater, and the shielding effectiveness is exponentially improved, perfectly adapting to the extreme working conditions of high current and strong interference. The simultaneous realization of mesh misalignment and diameter reduction + waveguide effective depth improvement results in dual shielding gain, greatly improving the electromagnetic shielding attenuation of the target interference frequency band. The shielding performance index far exceeds the grid access technical requirements of power grid distribution equipment.

[0021] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A switching dual-power supply distribution box for smart grids, characterized in that, include: A first housing, with a second housing slidably connected to the inner side of the first housing. A connecting frame is fixedly connected to the inner side of both the first housing and the inner side of the second housing. Two and one limiting slide grooves are respectively opened on the inner side of the first housing and the second housing, and a sliding frame is slidably connected to the inner side of each limiting slide groove. A shielding net is fixedly connected between adjacent connecting frames and between adjacent connecting frames and sliding frames. A dynamic shielding mechanism is disposed on the inner side of the first housing to enhance the shielding effect on the magnetic field generated by the current when the current increases. The dynamic shielding mechanism includes a rectangular groove opened on the inner side of the second housing, a first connecting plate slidably connected to the inner side of the rectangular groove, an isolation plate fixedly connected to the inner side of the first housing, and the isolation plate fixedly connected to a shielding mesh. A plurality of second connecting plates are provided between the first connecting plate and the isolation plate, and a second metal mesh is fixedly disposed between each second connecting plate and the second connecting plate, the first connecting plate, and the isolation plate. A dynamic adaptation mechanism is provided on the inner side of the second housing to dynamically adapt to changes in the second metal mesh.

2. The smart grid switching dual-power supply distribution box according to claim 1, characterized in that, The dynamic shielding mechanism includes two first barrier plates disposed on the top of the second metal mesh, and the two first barrier plates are respectively fixedly connected to two of the adjacent first connecting plates, second connecting plates, or isolation plates. A second barrier plate is slidably connected between the two first barrier plates, and a sliding component is provided at the bottom of the second barrier plate.

3. A smart grid switching dual-power supply distribution box according to claim 2, characterized in that, The sliding assembly includes a first telescopic plate slidably connected to the bottom of the first barrier plate, a second telescopic plate slidably connected between the two first telescopic plates, a third telescopic plate fixedly connected to the bottom of the first telescopic plate, a fourth telescopic plate slidably connected between the two third telescopic plates, and the second metal mesh sliding on the inner side of the third telescopic plate. The third telescopic plate is slidably connected to the inner side of the first connecting plate, and a rotating assembly is provided on the inner side of the second metal mesh.

4. A smart grid switching dual-power supply distribution box according to claim 3, characterized in that, The rotating assembly includes a first metal mesh sheet slidably connected to the inner side of the second metal mesh sheet. Both the first and second metal mesh sheets are composed of multiple rotating units. Each rotating unit includes four rotating plates and a rotating shaft, and the four rotating plates are rotatably connected to the rotating shaft.

5. A smart grid switching dual-power supply distribution box according to claim 4, characterized in that, The rotating assembly further includes a sliding groove formed inside the first connecting plate, the isolation plate, or the second connecting plate. A sliding strip is slidably connected to the inner side of the sliding groove, and the first metal mesh is fixedly connected to the sliding strip. A driving assembly is provided on one side of the first connecting plate.

6. A smart grid switching dual-power supply distribution box according to claim 5, characterized in that, The drive assembly includes a fixing block fixedly connected to one side of the first connecting plate, a connecting seat fixedly connected to the inner side of the first housing, a drive motor mounted on one side of the connecting seat, a rotating rod rotatably connected to the inner side of the connecting seat, and the output end of the drive motor fixedly connected to the rotating rod. A connecting rope is wound around the outer wall of the rotating rod, and one end of the connecting rope is fixedly connected to the fixing block.

7. A smart grid switching dual-power supply distribution box according to claim 6, characterized in that, The drive assembly also includes a mounting slot formed inside the second housing. Multiple second tension springs are installed between the first connecting plate and the inner wall of the mounting slot. A set of rectangular blocks is fixedly connected to one side of each of the first connecting plate, the isolation plate, and the second connecting plate. Each set of rectangular blocks has two blocks. Except for the last set, a cylinder is fixedly connected to one side of each rectangular block. A sliding column is slidably connected to the inner side of the cylinder. A first tension spring is installed between the sliding column and the inner side of the cylinder, and the elastic coefficient of the first tension spring decreases from left to right. One end of the sliding column is fixedly connected to an adjacent rectangular block.

8. A smart grid switching dual-power supply distribution box according to claim 7, characterized in that, The dynamic adaptation mechanism includes a first telescopic rod slidably connected to the inner side of the first connecting plate, a return spring installed between the inner side of the first connecting plate and the first telescopic rod, a driving block fixedly connected to the inner side of the mounting groove, an inclined surface provided on one side of the driving block, and a spherical rod fixedly connected to one side of the first telescopic rod.

9. A smart grid switching dual-power supply distribution box according to claim 8, characterized in that, The dynamic adaptation mechanism further includes a second telescopic rod slidably connected to the inner side of the first telescopic rod, a third telescopic rod slidably connected to the inner side of the second telescopic rod, and a fourth telescopic rod slidably connected to the inner side of the third telescopic rod. The four first metal mesh pieces are respectively fixedly connected to the top of the first telescopic rod, the second telescopic rod, the third telescopic rod, or the fourth telescopic rod.

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