A large box cable branch box with excellent protection

Abstract

The application relates to a cable branch box with excellent large box protection, and relates to the technical field of electrical equipment. The box is spliced by a first plate and a second plate, and the edges of the two plates are bent outward to form flanges and are attached and welded. An angle steel is fixed to the inner side of the box, the angle steel covers the welding surface to form a waterproof chamber, a sealing strip with a cavity and a wind baffle attached to the sealing strip are arranged in the chamber, a buoyancy valve for only draining water but not air is arranged at the bottom of the chamber, so that the chamber becomes a closed cavity through which gas can only enter from the welding surface. When external gas enters the chamber through the welding surface, the gas pushes the wind baffle to extrude the sealing strip, the sealing strip expands towards the inner wall of the chamber, the air pressure in the chamber increases with the increase of the entering gas amount, and the self-enhancing sealing effect that the greater the wind force, the better the sealing is realized.

Description

Technical Field

[0001] This application relates to the field of electrical equipment technology, and in particular to a large-sized cable branch box with excellent enclosure protection. Background Technology

[0002] Large, well-protected cable branch boxes are devices used for branching and connecting power cable lines and for power distribution control. They are mainly used in power distribution networks in urban and rural power grids, industrial and mining enterprises, residential areas, high-rise buildings, airports, and other locations. The main function of large, well-protected cable branch boxes is to realize the decomposition, branching, connection, and circuit switching of power distribution cable lines. In the construction and renovation of urban and rural power grids, large, well-protected cable branch boxes have become the preferred product to replace overhead incoming lines.

[0003] Currently, most large cable distribution boxes with excellent enclosure protection are constructed from sheet metal welded together, typically using bent and welded stainless steel plates. For example, there are already enclosure structures made by bending 2mm stainless steel plates through multiple folding processes and then forming them using stainless steel welding, resulting in high overall strength after forming. There are also technical solutions that use stainless steel plates for sealed welding to achieve full insulation and sealing.

[0004] Existing large cable distribution boxes with excellent protection employ double-folded edge structures to create drainage channels for waterproofing and sealing. For example, a patent discloses a sealed sheet metal enclosure where double-folded edges at the frame create trapezoidal drainage channels, and double-folded edges on the doors form gaps between the doors and walls, allowing infiltrated water to flow along the frame into the trapezoidal drainage channels and then drain. However, these existing solutions primarily address waterproofing the door gaps between the frame and the doors. For water seepage at the welded joints of the sidewall steel plates, the existing folded edge structures only drain the water along the drainage channels. Moisture from the welded surfaces can still penetrate the welds and enter the enclosure under wind pressure, causing condensation and corrosion on the inner walls, affecting the safe operation of electrical equipment inside.

[0005] However, when the outside wind force increases, the air pressure difference on both sides of the welded surface increases accordingly. Driven by the pressure difference, the rate at which the outside air passes through the capillary structure increases significantly, which in turn causes more outside moisture to pass through the welded surface and enter the waterproof chamber. As a result, the moisture content in the waterproof chamber increases with the increase of the outside wind force, and the internal space of the enclosure faces a higher risk of moisture, which in turn affects the insulation performance and service life of the electrical equipment inside the enclosure. Summary of the Invention

[0006] To overcome the above-mentioned technical problems, this application provides a cable branch.

[0007] This application provides a large-scale cable branch box with excellent enclosure protection, employing the following technical solution: A large, well-protected cable distribution box includes a box body, which is assembled from a first plate and a second plate. The edges of the first and second plates are bent outwards to form a first folded edge and a second folded edge, respectively. The first folded edge and the second folded edge are welded together, with the welded surface located inside the box body. An angle steel is fixed to the inner side of the box body, covering the welded surface and forming a waterproof chamber inside the box body. The welded surface is located inside the waterproof chamber. A pneumatic sealing enhancement mechanism is installed inside the waterproof chamber, which includes a sealing strip and a windproof plate. The sealing strip is an elastic body with an internal cavity. Fixed to the inner wall of the angle steel, the two ends of the sealing strip abut against the inner wall of the waterproof chamber; the wind baffle is a rigid plate, attached to the side of the sealing strip facing the welding surface; a buoyancy valve is installed at the bottom of the waterproof chamber, which only allows liquid to flow out of the waterproof chamber from the inside to the outside in one direction, and does not allow gas to be discharged from the inside of the waterproof chamber to the outside, making the waterproof chamber a closed cavity in which gas can only enter from the welding surface; when external gas enters the waterproof chamber through the welding surface, the gas pushes the wind baffle, the wind baffle squeezes the sealing strip, the sealing strip expands towards the inner wall of the waterproof chamber, and the air pressure in the waterproof chamber increases with the increase of the amount of gas entering.

[0008] By adopting the above technical solution, the angle steel covers the welded surface to form an independent waterproof chamber, isolating the welded surface from the internal space of the box and effectively preventing moisture passing through the welded surface from spreading into the internal space of the box. The "drainage only, no air release" characteristic of the buoyancy valve makes the waterproof chamber a closed cavity. When the external wind force increases and more gas passes through the welded surface into the waterproof chamber, the air pressure inside the cavity increases accordingly, pushing the wind baffle to squeeze the sealing strip. The sealing strip expands against the inner wall of the waterproof chamber, so that the sealing effect is enhanced with the increase of wind force. This overcomes the technical defect of the traditional solution that "the stronger the wind, the more water vapor enters and the worse the protection effect," and achieves a self-reinforcing sealing effect of "the stronger the wind, the better the seal."

[0009] Optionally, the sealing strip has an L-shaped cross-section and a laminated structure at both ends. When the sealing strip is compressed, the laminated structure deforms, causing the ends of the sealing strip to elongate.

[0010] By adopting the above technical solution, the L-shaped cross-section allows for controllable deformation of the sealing strip under pressure, ensuring that pressure is transmitted to the inner wall of the waterproof cavity in a predetermined direction. The laminated structure deforms and elongates when the sealing strip is compressed, allowing the two ends of the sealing strip to press more tightly against the inner wall of the waterproof cavity. The sealing contact area increases with increasing pressure, further enhancing the sealing effect and effectively preventing water vapor from seeping in from the joint interface between the angle steel and the inner wall of the box.

[0011] Optionally, the surface of the wind deflector is provided with an arc-shaped groove, and the opening of the arc-shaped groove faces the welding surface.

[0012] By adopting the above technical solution, the opening of the arc-shaped groove of the wind deflector faces the welding surface, which can more effectively capture the direction of the airflow entering from the welding surface, concentrate the dispersed wind force to the surface of the sealing strip, make the wind force transmission more complete, the sealing strip is subjected to more concentrated force, and improve the conversion efficiency of wind force into sealing pressure.

[0013] Optionally, a drain hole is provided at the bottom of the housing within the waterproof chamber, and a buoyancy valve is installed inside the drain hole.

[0014] By adopting the above technical solution, the drain hole provides the only outlet for water accumulation in the waterproof chamber. A buoyancy valve is installed inside the drain hole, utilizing the principle of buoyancy to achieve automatic drainage—when the accumulated water reaches a certain amount, the float rises and opens the valve to drain the water; after the water is drained, the float falls and closes the valve to maintain the chamber's airtightness. Without external power or manual intervention, it achieves adaptive drainage—"automatic drainage when water is present, automatic sealing when water is absent"—while ensuring that the chamber's pressure-maintaining function remains unaffected.

[0015] Optionally, the angle steel is a long strip profile with an L-shaped cross-section, consisting of a first plate and a second plate, which are attached to the inner wall surface of the box and fixed by welding.

[0016] By adopting the above technical solution, the L-shaped angle steel is simultaneously attached to the inner wall surface of the box and welded and fixed by the first plate and the second plate, forming a double fixing structure. The joint strength between the angle steel and the inner wall of the box is significantly improved, ensuring the long-term structural stability and sealing reliability of the waterproof chamber, and avoiding the impact on the sealing effect caused by the loosening of the angle steel due to vibration or thermal expansion and contraction.

[0017] Optionally, the buoyancy valve includes a valve body and a float. The valve body is fixedly installed in the drain hole, and the float is located inside the valve body. When there is water accumulation at the bottom of the waterproof chamber, the float rises due to buoyancy and opens the valve body. When the water is drained, the float falls and closes the valve body.

[0018] By adopting the above technical solution, the buoyancy valve utilizes the buoyancy of the accumulated water as its driving force, achieving fully automatic, zero-energy drainage control without the need for external energy or control signals. The valve body is fixed in the drain hole to ensure reliable installation, and the float moves inside the valve body unaffected by the external environment. After the accumulated water is drained, the float automatically falls and closes the valve, restoring the airtight and pressure-maintaining state of the cavity and ensuring that the air pressure inside the cavity does not leak out due to drainage.

[0019] Optionally, the baffle plate has a hollow cavity inside, and the top of the box is equipped with an air collecting mechanism that is in fluid communication with the hollow cavity of the baffle plate; the baffle plate has several air outlets on the side facing the welding surface; and a buoyancy valve is provided at the bottom of the baffle plate.

[0020] By adopting the above technical solution, active air curtain defense is further provided on the basis of self-reinforcing sealing. The air collection mechanism collects external air and sends it into the hollow cavity of the baffle plate, forming a continuous airflow barrier on the weld surface through the air outlet, actively isolating external moisture from contact with the weld surface, and reducing the entry of water vapor into the waterproof cavity from the source. The buoyancy valve at the bottom of the baffle plate automatically drains accumulated water, keeping the hollow cavity unobstructed. The self-reinforcing seal and the active air curtain work together to form a dual protection system of "active defense + adaptive sealing".

[0021] Optionally, the air collection mechanism includes an annular mounting base and an air guide column; the annular mounting base is installed on the top of the housing, the top of the annular mounting base is located outside the housing and is equipped with a waterproof cover, and the bottom of the annular mounting base extends into the waterproof cavity and communicates with the hollow cavity of the baffle plate; the air guide column is installed inside the annular mounting base, the air guide column is conical, and the outer wall of the air guide column is provided with a threaded structure; a baffle is fixed on the top of the air guide column, and the edge of the baffle is wavy.

[0022] By adopting the above technical solution, the wavy baffle edge provides multiple windward surfaces facing different directions, achieving all-round capture of wind force from the front, rear, left, right, and diagonal directions, significantly improving air collection efficiency. The conical guide column guides the airflow downwards at an accelerated speed. The threaded structure, on the one hand, guides the airflow to generate a rotational component, forming a spiral airflow to extend the flow path and increase turbulence; on the other hand, it significantly increases the contact area between the airflow and the guide column, causing water vapor in the outside humid air to condense before entering the hollow cavity of the baffle, reducing the amount of water vapor entering the cavity. The annular mounting base and waterproof cover ensure that rainwater does not enter the housing along the air collection channel, balancing air collection efficiency and waterproof reliability.

[0023] Optionally, a first sealing ring is provided between the annular mounting base and the top of the housing; a second sealing ring is provided between the waterproof cover and the baffle, and the upper surface of the second sealing ring is fixed to the inner wall of the baffle by adhesive; a dust cover is provided on the outer or inner surface of the waterproof cover.

[0024] By adopting the above technical solution, the first sealing ring prevents rainwater from seeping into the interior of the box through the gap between the annular mounting base and the top plate of the box; the upper surface of the second sealing ring is fixed to the baffle by adhesive bonding to achieve a seamless seal between the waterproof cover and the baffle, preventing rainwater from entering the air collection channel from the joint between the waterproof cover and the baffle; the dust cover blocks external dust, debris and insects from entering the air collection mechanism with the airflow, ensuring the cleanliness of the air curtain airflow, extending the service life of the air collection mechanism and the baffle, and the dust cover's detachable design facilitates regular cleaning and maintenance.

[0025] Optionally, a standard one-way valve is installed at the bottom of the waterproof chamber, which allows liquids and gases to flow out of the waterproof chamber from the inside to the outside in one direction.

[0026] By adopting the above technical solution, the ordinary one-way valve serves as the final drainage and venting outlet for the waterproof chamber. It allows water discharged from the baffle buoyancy valve and water that enters the waterproof chamber directly through the capillary structure from the welded surface to be discharged outside the chamber. Simultaneously, it allows excess gas within the waterproof chamber to escape, preventing excessive pressure within the chamber from affecting the stability of the sealing structure. The one-way flow characteristic of the one-way valve ensures that external gas and liquid cannot flow back into the waterproof chamber through this channel, guaranteeing the reliability of the chamber's one-way seal.

[0027] In summary, this application includes at least one of the following beneficial technical effects: 1. An angle steel is used to cover the welded surfaces to form an independent waterproof chamber, which isolates the welded surfaces from the internal space of the box. Combined with the "drainage only, no air release" characteristic of the buoyancy valve, the waterproof chamber becomes a closed cavity. When the external wind force increases and more gas passes through the welded surfaces and enters the waterproof chamber, the air pressure inside the cavity increases, pushing the wind baffle to squeeze the sealing strip. The sealing strip expands towards the inner wall of the waterproof chamber, achieving a self-reinforcing sealing effect of "the stronger the wind, the better the seal". This effectively overcomes the technical defects of traditional solutions where the stronger the wind, the more water vapor enters and the worse the protection effect. 2. The layered structure at both ends of the sealing strip causes the sealing strip to deform and elongate at both ends when compressed, and then compress the inner wall of the waterproof cavity. The sealing contact area increases with the increase of pressure, which further enhances the sealing effect between the angle steel and the box body, and effectively prevents water vapor from seeping in from the joint interface between the angle steel and the inner wall of the box body. 3. The wind deflector concentrates the dispersed wind force onto the sealing strip surface, improving the efficiency of converting wind force into sealing pressure; the buoyancy valve utilizes the buoyancy of the accumulated water to achieve adaptive drainage of "automatic drainage when there is water and automatic sealing when there is no water", without the need for external power or manual intervention, ensuring that the pressure-holding function of the cavity is not affected; 4. The wavy baffle edge of the air collection mechanism enables all-round capture of wind force in multiple directions. The conical air guide column guides the airflow to accelerate downward, and the threaded structure guides the airflow to rotate and increases the contact area so that water vapor condenses in advance, forming a continuous airflow barrier on the welding surface. This actively isolates the external moisture from contact with the welding surface, reducing the amount of water vapor entering the waterproof chamber from the source. The self-reinforcing seal and the active air curtain work together to form a dual protection system of "active defense + adaptive sealing". 5. The first sealing ring prevents rainwater from seeping in through the gap between the annular mounting base and the top plate of the box. The second sealing ring achieves a seamless seal between the waterproof cover and the corrugated baffle. The dust cover blocks external dust and insects from entering the air collection mechanism, ensuring the waterproof and dustproof reliability of the air collection channel. 6. The water and excess gas are finally discharged through the ordinary one-way valve at the bottom of the waterproof chamber. At the same time, the one-way flow characteristic prevents the backflow of external gas and liquid, ensuring the reliability of the one-way seal of the waterproof chamber. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the overall structure of Embodiment 1 of this application; Figure 2 This is a cross-sectional structural diagram of Embodiment 1 of this application; Figure 3 yes Figure 2 A magnified view of part A in the middle; Figure 4 This is a schematic diagram of the structure of Embodiment 2 of this application; Figure 5 This is a structural schematic diagram of Embodiment 2 of this application, mainly showing the waterproof chamber; Figure 6 yes Figure 4 A magnified view of part B in the middle section; Figure 7 This is a schematic diagram of the overall structure of Embodiment 3 of this application; Figure 8 yes Figure 7 A magnified view of part C in the middle; Figure 9 This is a structural schematic diagram of Embodiment 3 of this application, mainly showing the waterproof chamber; Figure 10 This is a structural schematic diagram of Embodiment 3 of this application, mainly illustrating the air collection mechanism.

[0029] In the diagram, 1. First sheet metal; 2. Second sheet metal; 3. First folded edge; 4. Second folded edge; 5. Angle steel; 6. Welded surface; 7. Drainage hole; 8. Sealing strip; 9. Wind baffle; 10. Buoyancy valve; 11. Annular mounting base; 12. Air guide column; 13. First sealing ring; 14. Waterproof cover; 15. Dustproof cover; 16. Baffle; 17. Second sealing ring; 18. Check valve. Detailed Implementation

[0030] The following is in conjunction with the appendix Figure 1 -Appendix Figure 10 This application will be described in further detail below. Example 1

[0031] This embodiment provides a large, well-protected cable branch box, referring to... Figure 1 , Figure 2 , Figure 3The enclosure includes a box body formed from two stainless steel sheets using a sheet metal bending process. The box body uses 2mm thick stainless steel sheets, which are bent by a CNC bending machine to form a first sheet 1 and a second sheet 2. The first sheet 1, after bending, forms part of the left side panel and back panel of the box body, while the second sheet 2, after bending, forms part of the right side panel and back panel. The two sheets are joined adjacently in the middle area of ​​the back panel. Thus, the two sheets together constitute the left side panel, right side panel, and back panel of the box body. Together with the top and bottom panels, they form a closed box structure with internal storage space. The top and bottom panels can be made from the same type of stainless steel sheet, bent separately, and then welded to the aforementioned two sheets.

[0032] The edge of the first sheet material 1 is bent outwards towards the outside of the box to form a first folded edge 3; the edge of the second sheet material 2 is bent outwards towards the outside of the box to form a second folded edge 4. Both the first folded edge 3 and the second folded edge 4 are elongated sheet structures with the same longitudinal extension direction and parallel surfaces. The outer surfaces of the first folded edge 3 and the second folded edge 4 are bonded together. In the bonded state, argon arc welding is used for continuous welding along the longitudinal direction of the bonding surfaces to fix the first folded edge 3 and the second folded edge 4 into a single unit. After welding, the welded surface 6 is located inside the box.

[0033] Because the welding surface 6 has several tiny capillaries, and the mating surfaces of the first fold 3 and the second fold 4 are not completely seamlessly fitted, but rather naturally form a tiny gap extending longitudinally, external water and air can pass through the welding surface 6 and enter the box body under the action of capillaries.

[0034] Inside the enclosure, an angle steel 5 is fixed at the joint of the two panels. This angle steel 5 is an L-shaped strip profile composed of a first panel and a second panel, which are perpendicular to each other. The first and second panels of the angle steel 5 are attached to the inner wall of the enclosure and fixed by welding, thus covering the welded surface 6 inside the enclosure. This forms an independent waterproof chamber inside the enclosure, with the welded surfaces 6 of the first panel 1 and the second panel 2 located within this chamber.

[0035] A drainage hole is provided at the bottom of the box body in the waterproof cavity. The drainage hole is a circular through hole that penetrates the bottom plate of the box body. When water flows into the box body through the gap between the first folded edge 3 and the second folded edge 4 and through the gap of the welded surface 6, the water can flow down along the inner wall of the waterproof cavity and be discharged to the outside of the box body through the drainage hole.

[0036] The working principle of this embodiment is as follows: External water and air pass through the capillary structure of the weld surface 6 under capillary action and enter the waterproof chamber. After entering the waterproof chamber, the water flows downward along the inner wall surface of the waterproof chamber under the action of gravity and will not diffuse into the internal space of the box. Finally, the water flows to the bottom of the waterproof chamber and is discharged outside the box through the drainage hole opened at the bottom of the waterproof chamber. On the one hand, the angle steel 5 acts as a structural reinforcement to improve the tensile strength and fatigue resistance of the weld; on the other hand, its first and second plates are attached to the inner wall surface of the box and cover the weld surface 6, forming an independent waterproof chamber inside the box. The weld surface 6 is located in this chamber, thereby isolating the weld surface 6 from the internal space of the box and effectively preventing the water passing through the weld surface 6 from diffusing into the internal space of the box. Example 2

[0037] The difference between this embodiment and Embodiment 1 is that, referring to... Figure 4 , Figure 5 , Figure 6 The waterproof chamber is equipped with a pneumatic sealing enhancement mechanism, which includes a sealing strip 8 and a wind baffle 9.

[0038] The sealing strip 8 is a long, elastic strip with an L-shaped cross-section, and is fixed to the inner wall of the angle steel 5, i.e., the surface of the angle steel 5 on the waterproof chamber. The sealing strip 8 has a cavity inside, and its two ends have a laminated structure, so that when the sealing strip 8 is compressed, its two ends deform and elongate.

[0039] When installed, the two ends of the sealing strip 8 abut against the inner wall of the waterproof cavity and cover the weld between the angle steel 5 and the box body; when the sealing strip 8 is compressed, the two ends of the sealing strip 8 extend out and compress the inner wall of the waterproof cavity to increase the sealing of the weld between the angle steel 5 and the box body.

[0040] The wind deflector 9 is a rigid thin plate with an arc-shaped groove on its surface, the opening of which faces the welding surface 6 of the first plate 1 and the second plate 2. One side of the wind deflector 9 is attached to the side of the sealing strip 8 facing the welding surface 6, that is, the outer surface of the sealing strip 8 facing the weld seam. The width of the wind deflector 9 is not less than the width of the sealing strip 8 to ensure that the wind deflector 9 completely covers the surface area of ​​the sealing strip 8 facing the welding surface 6.

[0041] A buoyancy valve 10 is installed at the drain hole in the bottom waterproof chamber of the housing. The buoyancy valve 10 is installed in the drain hole and allows liquid to flow out from the inside of the waterproof chamber to the outside in only one direction, but does not allow gas to be discharged from the inside of the waterproof chamber to the outside.

[0042] The buoyancy valve 10 includes a valve body and a float. The valve body is fixedly installed in the drain hole, and the float is located inside the valve body. When water accumulates at the bottom of the waterproof chamber, the buoyancy of the water pushes the float upward, opening the valve body and draining the water. When the water is drained, the float falls, closing the valve body and preventing gas from passing through. Thus, the waterproof chamber formed by the angle steel 5 becomes a closed cavity with only a single gas inlet—namely, the guide gap and the welded surface 6. Gas inside this cavity can only enter through this single inlet (the guide gap and the welded surface 6) and cannot exit through the buoyancy valve 10 at the bottom.

[0043] The working principle of this embodiment is as follows: When the outside wind force increases, the air pressure difference on both sides of the welding surface 6 increases accordingly. Driven by the pressure difference, the rate at which outside air passes through the capillary structure increases significantly, thereby prompting more outside water vapor to pass through the welding surface 6 and enter the waterproof chamber. After the water vapor enters the waterproof chamber, it first blows onto the surface of the windbreak plate 9.

[0044] As a rigid thin plate, the wind deflector 9 transmits wind force to the sealing strip 8 when subjected to wind. The sealing strip 8, due to its internal cavity, possesses excellent elastic deformation capability. Under the pressure transmitted by the wind deflector 9, the sealing strip 8 expands and deforms towards the inner wall of the waterproof chamber, resulting in a tighter seal between the sealing strip 8 and the inner wall of the waterproof chamber. Because the buoyancy valve 10 at the bottom of the waterproof chamber does not allow gas to escape, the air pressure inside the waterproof chamber increases with the increase in the amount of air entering. The stronger the wind, the more gas enters the waterproof chamber through the capillary structure of the welded surface 6, the higher the air pressure inside the waterproof chamber, the greater the force exerted on the sealing strip 8 against the inner wall of the waterproof chamber, and the stronger the sealing effect. Therefore, the stronger the wind, the tighter the seal of the sealing strip 8 on the waterproof chamber, thus establishing a dynamic countermeasure mechanism between "wind promoting the entry of water vapor" and "sealing strip 8 pressing and sealing"—the effect of wind promoting the entry is offset by the sealing effect of the sealing strip 8, achieving a self-reinforcing sealing effect of "the stronger the wind, the better the seal", effectively overcoming the defect in Example 1 where the stronger the wind, the lower the protective effect of the angle steel 5.

[0045] Meanwhile, under rainfall conditions, external moisture also passes through the capillary structure and guide gaps of weld surface 6 via capillary action and enters the waterproof chamber. Once inside the waterproof chamber, the moisture flows downwards along the inner wall surface under gravity, collecting at the bottom. When the water level at the bottom of the waterproof chamber reaches a certain amount, the buoyancy valve 10 automatically opens, draining the water; after the water is drained, the buoyancy valve 10 automatically closes, maintaining the airtightness of the waterproof chamber. Thus, the air path (wind-driven self-reinforcing seal) and the water path (one-way water discharge) share the same waterproof chamber and the same outlet (buoyancy valve 10), structurally coupling them into a single unit. Example 3

[0046] The difference between this embodiment and Embodiment 2 is that, referring to... Figure 7 , Figure 8 , Figure 9 , Figure 10 It also includes an air-collecting mechanism. A cavity is provided inside the baffle plate, and the air-collecting mechanism is in fluid communication with this cavity. After installation, the baffle plate is attached to the welding surface 6, and several tiny air outlets are opened on the surface of the baffle plate that is attached to the welding surface 6. Simultaneously, a buoyancy valve 10 is installed at the bottom of the baffle plate. This allows gas entering the baffle plate 9 through the air-collecting mechanism to be discharged through the air outlets, and liquid to be discharged through the buoyancy valve 10.

[0047] The top of the housing has a through hole that penetrates the top plate. The air collection mechanism is located on the top of the housing and includes an annular mounting base 11 and an air guide column 12.

[0048] The annular mounting base 11 is integrally inserted into the mounting through hole at the top of the housing. A first sealing ring 13 is fixed between the outer wall of the middle part of the annular mounting base 11 and the inner wall of the mounting through hole. This first sealing ring 13 is used to prevent rainwater from seeping into the housing through the gap between the annular mounting base 11 and the top plate of the housing. The top of the annular mounting base 11 is located outside the housing and is equipped with a waterproof cover 14. The bottom of the annular mounting base 11 extends into the waterproof cavity and is connected to the hollow cavity of the wind baffle 9 through a connecting pipe. The waterproof cover 14 is a shell-shaped component that covers the top of the annular mounting base 11 to prevent rainwater from falling directly into the interior of the annular mounting base 11.

[0049] A dust cover 15 is provided on the outer surface of the waterproof cover 14. The dust cover 15 is a mesh structure with several tiny vents, which covers the air intake area of ​​the waterproof cover 14 to prevent external dust, debris, and insects from entering the air collection mechanism, while allowing airflow to pass freely. The dust cover 15 is detachably installed on the waterproof cover 14 for easy regular cleaning and maintenance.

[0050] The air guide column 12 passes through the annular mounting base 11 and extends into the internal channel of the annular mounting base 11. The air guide column 12 is generally conical, with its tip extending into the air guide ring. The outer wall surface of the air guide column 12 is provided with a threaded structure.

[0051] A baffle 16 is fixed to the top of the air guide column 12. The edge of the baffle 16 is wavy, and the connection between the baffle 16 and the air guide column 12 is rounded.

[0052] A second sealing ring 17 is fixed to the top of the waterproof cover 14. The upper surface of the second sealing ring 17 is fixed to the inner wall of the baffle 16 by adhesive.

[0053] A standard one-way valve 18 is installed at the drain hole in the waterproof chamber at the bottom of the enclosure. This one-way valve 18, installed within the drain hole, allows liquid to flow out of the waterproof chamber in one direction only, while preventing external gas or liquid from flowing into the waterproof chamber. The specific structure of the one-way valve 18 is a conventional spring-loaded or gravity-operated one-way valve, which will not be described in detail here.

[0054] The implementation principle of this embodiment: First, it should be noted that, based on Example 1, Example 2 achieves a self-reinforcing sealing effect of "the greater the wind force, the better the seal" by setting a cavity-filled sealing strip 8 and a wind baffle 9 attached to the surface of the sealing strip 8 on the connecting steel plate of the angle steel 5, and setting a buoyancy valve 10 at the bottom of the waterproof chamber that only drains water and does not exhaust air. This is achieved when the external wind force increases, causing more gas to pass through the capillary structure of the welded surface 6 and enter the waterproof chamber, the wind force pushes the wind baffle 9 to squeeze the sealing strip 8, and the sealing strip 8 expands towards the inner wall of the waterproof chamber. This effectively overcomes the defect in Example 1 where the greater the wind force, the lower the protective effect of the angle steel 5.

[0055] This embodiment, based on the entire structure of Embodiment 2, further includes a top air-gathering mechanism and improves the baffle plate 9 in Embodiment 2 to have an internal hollow cavity. The buoyancy valve 10 is also moved from the bottom of the waterproof chamber to the bottom of the baffle plate 9. In other words, this embodiment also includes the sealing strip 8 structure described in Embodiment 2 (set on the second side plate of the connecting steel plate, with its left and right edges abutting against the inner wall surface of the waterproof chamber), to prevent water vapor from seeping into the internal space of the chamber from the joint interface between the angle steel 5 and the chamber body when the air curtain is formed.

[0056] The working principle of this embodiment is divided into two coordinated parts: the gas system and the water system.

[0057] The working principle of the gas system is as follows: When external airflow blows towards the top of the housing from any direction, the wavy edge of the baffle 16 at the top of the air guide column 12 provides multiple windward surfaces facing different directions. No matter which direction the wind blows from, there will always be at least one wavy convex surface facing the direction of the wind, thus achieving all-round capture of wind force from multiple directions, including front, rear, left, right, and diagonal. The captured airflow smoothly transitions along the surface of the baffle 16 through rounded corners to the conical surface of the air guide column 12, and flows into the interior of the annular mounting base 11 under the guidance of the conical structure. When the airflow flows through the threaded structure on the surface of the air guide column 12, the spiral grooves of the thread guide the airflow to generate a rotational component, causing the airflow to spiral down along the surface of the air guide column 12, through the internal channel of the annular mounting base 11, and then directly into the hollow cavity of the baffle plate 9 through the connecting pipe.

[0058] The airflow entering the hollow cavity of the baffle 9 accumulates and builds positive pressure within the cavity. It then exits at high speed through numerous tiny air outlets on the welded surface 6, forming a continuous airflow barrier on the surface of the welded surface 6. This airflow barrier physically isolates external moisture from contact with the welded surface 6, effectively preventing moisture from seeping into the waterproof cavity along the capillary structure of the welded surface 6. Because the buoyancy valve 10 installed at the bottom of the baffle 9 only allows liquid discharge and not gas discharge, the gas inside the hollow cavity of the baffle 9 cannot escape from the bottom, and the air pressure inside the cavity increases with the amount of air entering. The stronger the external wind, the more gas enters the hollow cavity of the baffle 9 through the air collection mechanism, the higher the air pressure inside the cavity, the faster the airflow velocity from the micro-holes, the stronger the air curtain barrier, and the stronger the waterproof effect. Meanwhile, the sealing strip 8 set on the second side plate of the connecting steel plate remains in contact with the inner wall of the waterproof cavity during the formation of the air curtain, ensuring that the air curtain pressure will not force water vapor from the joint interface between the angle steel 5 and the inner wall of the box into the internal space of the box.

[0059] The working principle of the water system is as follows: During rainfall, moisture carried by the outside humid air enters the hollow cavity of the wind deflector 9 through the air collection mechanism along with the airflow. The water vapor condenses on the inner wall surface of the cavity to form water droplets, which flow down the inner wall surface of the wind deflector 9 and collect at the bottom of the wind deflector 9. When the water accumulation at the bottom of the wind deflector 9 reaches a certain amount, the accumulated water generates buoyancy, pushing the float of the buoyancy valve 10 at the bottom of the wind deflector 9 to rise. The valve opens, and the accumulated water is discharged from the hollow cavity of the wind deflector 9 into the waterproof chamber. After the water is drained, the float falls, the valve closes, and the hollow cavity of the wind deflector 9 is kept airtight.

[0060] The water entering the waterproof chamber, along with the water that enters through the capillary structure from welded surface 6, flows downwards along the inner wall of the waterproof chamber and collects at the bottom. A standard one-way valve 18 is installed at the drain hole at the bottom of the waterproof chamber. When the water at the bottom of the waterproof chamber reaches a certain amount, the water pressure overcomes the opening pressure of the one-way valve 18, and the water is discharged out of the chamber through the drain hole. At the same time, this standard one-way valve 18 also allows excess gas entering the waterproof chamber to be discharged unidirectionally from the inside of the waterproof chamber to the outside, while external gas cannot enter the waterproof chamber through this one-way valve 18.

[0061] In the absence of rain but with high air humidity, the airflow continuously ejected from the tiny air outlets of the wind deflector 9 acts on the capillary surface of the welding surface 6, blowing away the condensation formed in the capillary gaps due to the temperature difference between day and night and accelerating its evaporation, thereby effectively preventing the long-term accumulation of condensation at the welding capillary and causing weld corrosion.

[0062] The air system and the water system share the structure of the baffle plate 9. The hollow cavity of the baffle plate 9 serves the airflow and pressure maintenance of the air system, while the inner wall surface of the baffle plate 9 serves the condensation collection and flow guidance of the water system. The buoyancy valve 10 at the bottom of the baffle plate 9 unifies the functions of the air system (pressure maintenance without venting) and the water system (water drainage) on the same valve. The ordinary one-way valve 18 at the bottom of the waterproof chamber serves as the final drainage and venting outlet for the waterproof chamber layer. The two systems are structurally coupled and functionally complementary, together forming a complete waterproof system.

[0063] The embodiments described in this specific implementation are preferred embodiments of this application and are not intended to limit the scope of protection of this application. Identical components are represented by the same reference numerals. Therefore, all equivalent changes made to the structure, shape, and principle of this application should be covered within the scope of protection of this application.

Claims

1. A large-scale cable branch box with excellent protection, comprising a box body, the box body being spliced ​​from a first plate (1) and a second plate (2), wherein the edges of the first plate (1) and the second plate (2) are respectively bent outwards to form a first folded edge (3) and a second folded edge (4), the first folded edge (3) and the second folded edge (4) being welded together, and the welding surface (6) being located inside the box body, characterized in that, An angle steel (5) is fixed to the inside of the box body. The angle steel (5) covers the welding surface (6) to form a waterproof chamber inside the box body. The welding surface (6) is located inside the waterproof chamber. The waterproof cavity is provided with a pneumatic sealing enhancement mechanism, which includes a sealing strip (8) and a wind baffle (9); The sealing strip (8) is an elastic body with an internal cavity. The sealing strip (8) is fixed to the inner wall of the angle steel (5), and the two ends of the sealing strip (8) abut against the inner wall of the waterproof chamber. The wind baffle (9) is a rigid plate and is attached to the side of the sealing strip (8) facing the welding surface (6). A buoyancy valve (10) is provided at the bottom of the waterproof chamber. The buoyancy valve (10) only allows liquid to flow out from the inside of the waterproof chamber to the outside in one direction, and does not allow gas to be discharged from the inside of the waterproof chamber to the outside, so that the waterproof chamber becomes a closed cavity in which gas can only enter from the welding surface (6). When external gas enters the waterproof chamber through the welding surface (6), the gas pushes the baffle plate (9), the baffle plate (9) squeezes the sealing strip (8), the sealing strip (8) expands towards the inner wall of the waterproof chamber, and the air pressure in the waterproof chamber increases with the increase of the amount of gas entering.

2. The large-scale cable branch box with excellent enclosure protection according to claim 1, characterized in that, The sealing strip (8) has an L-shaped cross-section and is provided with a stacked structure at both ends. When the sealing strip (8) is squeezed, the stacked structure deforms and the two ends of the sealing strip (8) elongate.

3. The large-scale cable branch box with excellent enclosure protection according to claim 1, characterized in that, The surface of the wind deflector (9) is provided with an arc-shaped groove, and the opening of the arc-shaped groove faces the welding surface (6).

4. The large-scale cable branch box with excellent enclosure protection according to claim 1, characterized in that, The bottom of the box has a drain hole in the waterproof cavity, and the buoyancy valve (10) is installed in the drain hole.

5. The large-scale cable branch box with excellent enclosure protection according to claim 1, characterized in that, The angle steel (5) is a long strip profile with an L-shaped cross-section, consisting of a first plate and a second plate. The first plate and the second plate are attached to the inner wall surface of the box and fixed by welding.

6. The large-scale cable branch box with excellent enclosure protection according to claim 1, characterized in that, The buoyancy valve (10) includes a valve body and a float. The valve body is fixedly installed in the drain hole, and the float is disposed inside the valve body. When there is water accumulation at the bottom of the waterproof chamber, the float is lifted by buoyancy to open the valve body. When the water is drained, the float falls to close the valve body.

7. The large-scale cable branch box with excellent enclosure protection according to claim 1, characterized in that, The baffle plate (9) has a hollow cavity inside, and the top of the box is provided with an air collecting mechanism. The air collecting mechanism is in fluid communication with the hollow cavity of the baffle plate (9). The baffle plate (9) has several air outlet holes on the side facing the welding surface (6). The bottom of the baffle plate (9) is provided with a buoyancy valve (10).

8. The large-scale cable branch box with excellent enclosure protection according to claim 7, characterized in that, The air collection mechanism includes an annular mounting base (11) and an air guide column (12); the annular mounting base (11) is installed on the top of the housing, the top of the annular mounting base (11) is located outside the housing and is provided with a waterproof cover (14), the bottom of the annular mounting base (11) extends into the waterproof cavity and communicates with the hollow cavity of the baffle plate (9); the air guide column (12) is installed inside the annular mounting base (11), the air guide column (12) is conical, and the outer wall of the air guide column (12) is provided with a threaded structure; a baffle (16) is fixed on the top of the air guide column (12), and the edge of the baffle (16) is wavy.

9. The large-scale cable branch box with excellent enclosure protection according to claim 8, characterized in that, A first sealing ring (13) is provided between the annular mounting base (11) and the top of the box; a second sealing ring (17) is provided between the waterproof cover (14) and the baffle (16), and the upper surface of the second sealing ring (17) is fixed to the inner wall of the plane of the baffle (16) by adhesive bonding; a dust cover (15) is provided on the outer or inner surface of the waterproof cover (14).

10. The large-scale cable branch box with excellent enclosure protection according to claim 7, characterized in that, The bottom of the waterproof chamber is provided with a common one-way valve (18), which allows liquid and gas to flow out of the interior of the waterproof chamber in one direction to the outside.

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