A waterproof and heat-insulated cable branch box

Abstract

This invention discloses a waterproof and heat-insulating cable distribution box, relating to the field of power distribution equipment technology, including a protective component, a heat dissipation component, and a support component. The protective component has a protective box with a cavity interlayer for installing and protecting cable components; the heat dissipation component is located on the top of the protective box for driving air circulation within the box to achieve forced heat dissipation; the base of the support component has a water storage structure that can collect natural rainfall for automatic water replenishment. The cavity interlayer of the protective box contains an absorbent cotton layer, the bottom end of which connects to the water storage cavity in the base. The evaporation of water carries away heat from the box, working in conjunction with the cavity interlayer to isolate external heat and moisture. This invention achieves both high-level waterproofing and heat insulation with efficient heat dissipation, eliminating the need for manual water replenishment, significantly reducing equipment maintenance costs, and improving the reliability of outdoor operation.

Description

Technical Field

[0001] This invention relates to the field of power distribution equipment technology, and in particular to a waterproof and heat-insulating cable branch box. Background Technology

[0002] In power distribution network systems, cable distribution boxes are core equipment for cable line branching, transfer, and protection. They are widely used in urban municipal distribution networks, industrial parks, residential communities, outdoor substations, and other scenarios, with outdoor ground-mounted cable distribution boxes accounting for a very high proportion. These devices are exposed to the natural environment for extended periods, needing to withstand various harsh conditions such as rain erosion, high-temperature exposure, and dust pollution. Their waterproof sealing, heat insulation, and heat dissipation performance directly determine the operational reliability, insulation performance, and service life of internal components such as cable joints, circuit breakers, and instrument transformers, and are crucial for ensuring the safe and stable operation of the distribution network system.

[0003] Currently, existing outdoor cable distribution box technologies generally suffer from the core problem of not being able to simultaneously achieve waterproofing and heat dissipation performance. Conventional single-layer metal distribution boxes mainly rely on door sealing strips for waterproofing and can only dissipate heat naturally within the box. Under high temperatures and direct sunlight in summer, external heat radiation is rapidly conducted through the single-layer box to the interior cavity. Combined with the Joule heat generated by the components, this can easily cause the internal temperature to far exceed the rated operating temperature of the components, resulting in accelerated insulation aging, increased contact resistance, and even thermal runaway, short circuits, and fires. At the same time, the sealing strips of the single-layer box are prone to aging and cracking due to long-term exposure to the outdoor environment, allowing rainwater and moisture to seep into the box and cause moisture-induced short circuits in the components.

[0004] To address heat dissipation issues, existing technologies often employ forced air cooling, creating ventilation openings on the side walls of the enclosure and installing cooling fans to achieve forced air convection. However, this approach directly compromises the enclosure's sealed structure, allowing rainwater, moisture, and dust to easily enter through the ventilation openings. This significantly reduces the equipment's waterproof and dustproof performance, creating a technical contradiction of "improved heat dissipation leads to decreased waterproofing," making it unsuitable for long-term stable operation in high-humidity and rainy outdoor conditions. Other solutions utilize water cooling technology, using circulating cooling water to remove heat from the enclosure. However, this approach requires an additional water supply system, circulation pipelines, and power unit, resulting in complex equipment structure, extremely high installation and maintenance costs, and the safety hazard of electrical short circuits caused by pipeline leaks. It is unsuitable for outdoor distributed installation scenarios and fails to meet the long-term reliable operation requirements of outdoor cable distribution boxes. Summary of the Invention

[0005] To address the aforementioned technical problems, this invention proposes a waterproof and heat-insulating cable branch box.

[0006] To achieve the above objectives, the present invention provides the following solution: A waterproof and heat-insulating cable distribution box, comprising: A protective assembly for protecting cable components; including a protective box, a door hinged to one side of the protective box, an interior cavity for installing cable components; and a cavity interlayer provided on the side wall of the protective box.

[0007] A heat dissipation assembly for drawing air from the inner cavity of the protective box; comprising a heat dissipation box and a radiator, wherein the radiator is fixedly connected to the bottom surface of the inner cavity of the heat dissipation box, and the bottom surface of the heat dissipation box is fixedly connected to the top surface of the protective box; the heat dissipation box is hinged to the box door; A support assembly for supporting the protective assembly and the heat dissipation assembly; including a base, wherein a wire hole is provided in the center of the base for the cable to pass through, and the bottom surface of the heat dissipation box is fixedly connected to the top surface of the base.

[0008] Preferably, the protective box includes a first box and a second box. The first box is fitted over the outside of the second box, and the opening of the first box is fixedly connected to the opening of the second box. The top surface of the first box is fixedly connected to the top surface of the second box. One side of the opening of the first box is hinged to the box door. Ventilation holes are respectively provided on the opposite side walls of the first box. Water-absorbing cotton layers are respectively fixedly connected to the outer sides of the opposite side walls of the second box, and the bottom end of the water-absorbing cotton layers is disposed in the base. A plurality of air outlet holes are provided on the top surface of the second box, and a plurality of air outlet components are provided on the outer side of the air outlet holes. An air inlet component is fixedly connected to and communicates with one side wall of the second box.

[0009] Preferably, the venting component includes a sealing ring, the vent is disposed within the sealing ring, the sealing ring is fixedly connected to the top surface of the second housing, the top surface of the sealing ring is detachably connected to a venting plate, one end of the venting plate is hinged with a plurality of hinges, a wedge-shaped limiting block is disposed between two adjacent hinges, the limiting block is fixedly connected to the top surface of the second housing, and the limiting block is limitedly connected to one end face of the venting plate.

[0010] Preferably, the air intake component includes an air intake frame, an air intake plate is fixedly connected to the inner cavity of the air intake frame, and a compression hole is provided on the end face of the air intake plate; a filter layer is provided on one side of the air intake plate, and the filter layer is detachably connected to the air intake frame.

[0011] Preferably, the heat sink has ventilation holes on opposite side walls, and the bottom surface of the inner cavity of the heat sink is fixedly connected to the radiator; the radiator is provided with a plurality of components, including a guide tube, the guide tube is fixedly connected to the top surface of the second housing, and an axial fan is fixedly connected to the inner cavity of the guide tube, the axial direction of the axial fan is aligned with the axial direction of the ventilation hole.

[0012] Preferably, the base includes a water storage tank and an installation box. The top surface of the water storage tank is fixedly connected to the bottom surface of the installation box. A water guide groove is provided on the top surface of the installation box, and the water guide groove is connected to the inner cavity of the water storage tank. The water guide groove is filled with a filter layer for infiltration. The bottom end of the absorbent cotton layer is located on the bottom surface of the inner cavity of the water storage tank. The wire hole is opened in the inner cavity of the water storage tank.

[0013] Preferably, the bottom surface of the second housing is fixedly connected to the bottom surface of the first housing, and the second housing is sealed and connected to the wire hole.

[0014] Preferably, the compression hole has a trumpet-shaped structure, with the larger diameter end of the compression hole facing the first housing.

[0015] Compared with the prior art, the present invention has the following advantages and technical effects: This invention fixes the cable components within the protective enclosure, utilizing a hollow cavity to isolate the branch box from external air and moisture exchange, thereby reducing the impact of natural precipitation and high-temperature radiation. Simultaneously, the radiator actively activates, promoting airflow within the hollow cavity. The evaporation of moisture from the absorbent cotton layer within the cavity removes heat from the inner cavity of the second enclosure. This achieves both active heat dissipation through airflow and heat exchange within the second enclosure, and the storage and transfer of heat absorbed by the side walls of the second enclosure through moisture evaporation within the hollow cavity, improving the branch box's heat dissipation efficiency. Furthermore, the moisture used for evaporation within the base can be stored through natural precipitation, reducing maintenance costs. Attached Figure Description

[0016] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments and descriptions of this application are used to explain this application and do not constitute an undue limitation of this application. In the drawings: Figure 1 This is a side view of the three-dimensional structure of the present invention; Figure 2 A side-view three-dimensional structural diagram of the radiator and exhaust components; Figure 3 This is a side view of the three-dimensional structure of the base; Figure 4 This is a schematic diagram of the main structure of the protective box; Figure 5 This is a side view of the three-dimensional structure of the air intake component.

[0017] The components are as follows: 1. Box door; 2. Heat dissipation box; 3. Radiator; 4. Wiring hole; 5. First box body; 6. Second box body; 7. Vent hole; 8. Water-absorbing cotton layer; 9. Air outlet; 10. Sealing ring; 11. Air outlet plate; 12. Hinge; 13. Limiting block; 14. Air inlet frame; 15. Air inlet plate; 16. Compression hole; 17. Vent hole; 18. Flow guide tube; 19. Axial flow fan; 20. Water storage tank; 21. Mounting box; 22. Water guide groove; 23. Filter layer. Detailed Implementation

[0018] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0019] It should be noted that all components in the technical solution of this application require necessary additional facilities for water supply, oil supply, power supply, and gas supply for driving and / or control. Unless otherwise stated, they are assumed to be used and equipped with existing technology and no special explanation is required.

[0020] It should be noted that, in order to make the above-mentioned objectives, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0021] Example 1: A basic design for a waterproof and heat-insulating cable branch box includes protective components, heat dissipation components, and support components.

[0022] The protective assembly is used to protect cable components, including a protective box. A door 1 is hinged to one side of the protective box. The inner cavity of the protective box is a sealed cavity for fixing and installing cable components such as cable joints and circuit breakers. The side wall of the protective box is provided with a cavity interlayer, which is a closed air interlayer to isolate the external air and moisture from the heat exchange and water vapor exchange of the inner cavity of the protective box.

[0023] The heat dissipation assembly is used to draw air from the inner cavity of the protective box to achieve forced heat dissipation. It includes a heat dissipation box 2 and a radiator 3. The radiator 3 is fixedly connected to the bottom surface of the inner cavity of the heat dissipation box 2 by bolts. The bottom surface of the heat dissipation box 2 is fixedly connected to the top surface of the protective box by welding or bolts, so that the inner cavity of the heat dissipation box 2 and the inner cavity of the protective box are connected through the air outlet 9.

[0024] The support assembly is used to support the protective assembly and the heat dissipation assembly. It includes a base with a wire hole 4 in the center of the base. The wire hole 4 is a circular through hole for the cable to pass through. The cable can enter the inner cavity of the protective box through the wire hole 4 and connect to the components. The bottom surface of the protective box is fixedly connected to the top surface of the base by bolts and sealing gaskets.

[0025] Furthermore, the top surface of the base is set to be lower than the ground where the branch box is installed, so that natural rainwater can flow along the ground into the water storage structure of the base, realizing the collection and utilization of rainwater.

[0026] The implementation process and working principle of this embodiment are as follows: The cable components are fixedly installed inside the protective box. After the box door 1 is closed, the protective box forms a sealed protective structure. The cavity interlayer of the side wall isolates external heat and moisture through a static air layer, reducing the impact of natural precipitation and high-temperature solar radiation on the components inside the box. When the temperature inside the box rises to a preset threshold, the radiator 3 is activated, actively drawing in the hot air inside the protective box and expelling it to the outside. At the same time, it promotes air circulation within the cavity interlayer. Combined with the evaporation of moisture from the absorbent cotton layer within the cavity interlayer, it removes the radiant heat absorbed by the side wall of the protective box. This achieves heat dissipation inside the box through forced convection and heat insulation and cooling of the side wall of the box through evaporative cooling, significantly improving the heat dissipation efficiency of the branch box. Meanwhile, the base can collect natural precipitation as a water source for evaporative cooling, eliminating the need for manual water replenishment and reducing equipment maintenance costs.

[0027] Furthermore, the start-up method of the heat sink 3 can be controlled by a PLC controller with an integrated temperature sensor, which is not a technology that needs to be protected in this application, and will not be described in detail here.

[0028] Example 2 This embodiment is an optimized solution based on Embodiment 1, with detailed optimizations made to the structure of the protective component, as follows: The protective box includes a first box 5 and a second box 6. The first box 5 is fitted over the outside of the second box 6. Both the first box 5 and the second box 6 are rectangular box structures with an opening on one side. They are preferably made of 304 stainless steel with a plate thickness of 1.5-2mm, which has excellent anti-corrosion and anti-rust properties. The opening edge of the first box 5 and the opening edge of the second box 6 are fixedly connected by welding. The top surface of the first box 5 and the top surface of the second box 6 are fixedly connected by welding. The bottom surface of the second box 6 and the bottom surface of the first box 5 are fixedly connected by welding, so that a closed cavity sandwich is formed between the first box 5 and the second box 6. A through hole is opened in the center of the bottom surface of the second box 6. The through hole is coaxially arranged with the wire hole 4 of the base. The edge of the through hole of the second box 6 and the edge of the wire hole 4 are sealed and fixed by a silicone rubber sealing ring, so that the inner cavity of the second box 6 is connected to the wire hole 4, while preventing moisture from entering from the connection.

[0029] Furthermore, the three opposite sidewalls of the first box 5 and the second box 6, except for the sidewalls at the opening, are all spaced apart to form a uniform cavity interlayer. The gap width of the interlayer is 40-80mm, which ensures the heat insulation effect while controlling the overall volume of the box.

[0030] The opening side of the first housing 5 is hinged to the door 1 via a hinge. The edge of the door 1 is provided with a silicone rubber sealing strip, which can seal the opening of the first housing 5, the opening of the second housing 6, and the opening on the same side of the heat dissipation box 2 when closed. Ventilation holes 7 are respectively provided on the two sets of opposite side walls of the first housing 5. The ventilation holes 7 preferably use a grid structure with a spacing of 5-8mm between adjacent grids and 4-8 grids on a single set of side walls to enable air communication between the cavity interlayer and the outside.

[0031] The outer surfaces of the two sets of opposite sidewalls of the second housing 6 are respectively bonded with waterproof adhesive to absorbent cotton layers 8. The absorbent cotton layers 8 are made of polyester fiber absorbent cotton with a thickness of 10-20mm and have the characteristics of high water absorption, corrosion resistance and anti-aging. The bottom end of the absorbent cotton layer 8 penetrates the bottom surface of the first housing 5 and extends into the water storage cavity in the base. The penetration is sealed with a silicone rubber sealing ring to prevent water vapor and dust from entering the cavity interlayer from the penetration.

[0032] The top surface of the second housing 6 is provided with several air outlets 9. The air outlets 9 are circular through holes with a diameter of 10-15mm, which are used to allow air to be discharged from the inner cavity of the second housing 6. Several air outlet components are provided on the outside of the air outlets 9. An air inlet component is fixedly connected to and connected to one side wall of the second housing 6. The air inlet component connects the cavity interlayer with the inner cavity of the second housing 6, so that outside air can enter the cavity interlayer through the air vent 7, and then enter the inner cavity of the second housing 6 through the air inlet component.

[0033] Furthermore, the venting component includes a sealing ring 10, which is made of silicone rubber and has a rectangular ring structure. All vent holes 9 are located within the inner ring of the sealing ring 10. The bottom surface of the sealing ring 10 is bonded and fixed to the top surface of the second housing 6 with waterproof adhesive. The top surface of the sealing ring 10 is connected to a vent plate 11 by hinge 12. The vent plate 11 is made of 304 stainless steel plate with a thickness of 1-1.5mm. The area of ​​the vent plate 11 is larger than the outer ring area of ​​the sealing ring 10, and can completely cover the sealing ring 10 to prevent external debris and moisture from entering the inner cavity of the second housing 6 through the vent holes 9.

[0034] One end of the vent plate 11 is hinged with 2-4 hinges 12. A wedge-shaped limiting block 13 is provided between two adjacent hinges 12. The limiting block 13 is welded and fixedly connected to the top surface of the second housing 6. The inclined surface of the limiting block 13 faces the flip side of the vent plate 11 and can limit and abut against the flip end face of the vent plate 11, limiting the maximum flip angle of the vent plate 11 to 45°-60° (less than 90°). This ensures that when the radiator 3 is closed, the vent plate 11 can automatically fall back under the action of gravity, completely covering the sealing ring 10 and sealing the vent hole 9.

[0035] Furthermore, the air intake component includes an air intake frame 14, which is a rectangular frame structure that penetrates and is welded to the side wall of the second housing 6, so that one end of the air intake frame 14 is connected to the cavity interlayer and the other end is connected to the inner cavity of the second housing 6; an air intake plate 15 is welded and fixedly connected to the inner cavity of the air intake frame 14, and several compression holes 16 are opened on the end face of the air intake plate 15; a filter layer is provided on the side of the air intake plate 15 away from the cavity interlayer. The filter layer is made of non-woven filter cotton and is detachably connected to the air intake frame 14 by a snap fastener. It can filter particulate matter in the air, purify the air entering the inner cavity of the second housing 6, and reduce dust adhesion to the components inside the housing.

[0036] The implementation process and working principle of this embodiment are as follows: When the radiator 3 is started, it draws in hot air from the inner cavity of the second housing 6, creating a negative pressure inside the second housing 6. Outside air enters the cavity interlayer through the vent 7 on the side wall of the first housing 5, and is filtered through the compression hole 16 of the air intake plate 15 and the filter layer of the air intake frame 14 before entering the inner cavity of the second housing 6, forming a complete air intake path. At the same time, the hot air inside the second housing 6 is pushed open by the air outlet 9 through the air outlet 9 and enters the inner cavity of the radiator 2, and is finally discharged to the outside through the radiator 2, achieving forced convection cooling.

[0037] When the air in the cavity interlayer flows through the absorbent cotton layer 8 on the side wall of the second box 6, the absorbent cotton layer 8 absorbs water from the water storage cavity of the base through capillary action. The water evaporates under the action of air flow, absorbing the heat of the side wall of the second box 6 and isolating the external solar radiation heat from being transferred to the inner cavity of the second box 6. At the same time, the air layer in the cavity interlayer further enhances the heat insulation effect, achieving dual protection of waterproofing and heat insulation.

[0038] When the radiator 3 stops running, the air vent plate 11 falls back under the action of gravity, sealing the air vent 9. At the same time, the negative pressure inside the second housing 6 disappears, air convection stops, and the second housing 6 returns to a sealed state, preventing external moisture and debris from entering, thus achieving waterproof protection in the shutdown state.

[0039] Example 3 This embodiment is a complete optimization based on Embodiment 2, with detailed refinements to the structure of the heat dissipation component and the support component, as follows: The heat sink 2 is a rectangular box structure with an open bottom. Two sets of opposite sidewalls each have ventilation holes 17, which are circular through holes with a diameter of 8-12mm. Each set of sidewalls has 10-30 ventilation holes 17, allowing air communication between the interior of the heat sink 2 and the outside environment. The bottom of the interior of the heat sink 2 is fixedly connected to the radiator 3 with bolts. The radiator 3 has 2-4 sets, each set including a guide tube 18, which is a circular cylindrical structure. The bottom end of the structure is fixedly connected to the top surface of the second housing 6 via a flange, and the inner cavity of the guide tube 18 is set parallel to the axis of the air outlet 9. An axial flow fan 19 is fixedly connected to the inner cavity of the guide tube 18 via a bracket. The axial flow fan 19 is a DC 24V waterproof axial flow fan, which is compatible with outdoor power distribution lines. The axis of the axial flow fan 19 is set in line with the axis of the vent 17 to ensure that the drawn hot air can be directly discharged to the outside through the vent 17, reducing wind resistance and improving heat dissipation efficiency.

[0040] The base includes a water storage tank 20 and an installation box 21. The water storage tank 20 is a rectangular box structure with an open top surface. Its top surface is welded and sealed to the bottom surface of the installation box 21 to form a closed water storage cavity. A water guide groove 22 is provided on the top surface of the installation box 21. The water guide groove 22 is an annular groove structure and is set along the edge of the top surface of the installation box 21. Several drainage holes are provided on the bottom surface of the water guide groove 22 to connect the water guide groove 22 with the inner cavity of the water storage tank 20. The water guide groove 22 is filled with a filter layer 23, which includes a lower layer. The quartz sand filter layer and the upper non-woven fabric filter layer completely cover all the water leakage holes, which can filter the mud and sand and debris in the rainwater, and avoid clogging the water leakage holes and contaminating the water storage cavity; the bottom end of the absorbent cotton layer 8 penetrates the bottom surface of the first box 5 and the top surface of the mounting box 21, and extends to the bottom surface of the inner cavity of the water storage tank 20, ensuring that it can always absorb the rainwater in the water storage tank 20; the wire hole 4 is coaxially opened at the center of the bottom surface of the water storage tank 20 and the top surface of the mounting box 21, and the cable can enter the inner cavity of the second box 6 from below the water storage tank 20 through the wire hole 4.

[0041] Furthermore, the compression hole 16 has a trumpet-shaped structure. The larger diameter end of the compression hole 16 is set towards the first housing 5 (i.e., the cavity interlayer side), and the smaller diameter end is set towards the inner cavity of the second housing 6. When air passes through the compression hole 16, it flows in from the larger diameter end and flows out from the smaller diameter end, thereby compressing the air. After the compressed air enters the inner cavity of the second housing 6, the pressure is released, absorbing the surrounding heat and further reducing the air temperature inside the second housing 6, thus improving the heat dissipation effect.

[0042] The implementation process and working principle of this embodiment are as follows: During natural precipitation, rainwater flows along the ground into the water guide channel 22 on the top surface of the installation box 21. After being filtered by the water filter layer 23, it flows into the inner cavity of the water storage tank 20 through the water leakage hole for storage, providing a water source for evaporative cooling. The water-absorbing cotton layer 8 absorbs the water in the water storage tank 20 onto the water-absorbing cotton layer 8 on the side wall of the second box 6 through capillary action, realizing continuous automatic water replenishment without manual maintenance.

[0043] When the temperature inside the second chamber 6 exceeds a preset threshold (e.g., 40°C), the axial fan 19 starts, drawing in hot air from the second chamber 6 along the axial direction. The hot air enters the guide tube 18 through the air outlet 9, and then is discharged to the outside through the vent 17 on the side wall of the heat sink 2. At the same time, outside air enters the cavity interlayer through the vent 7. When it flows through the absorbent cotton layer 8, it causes water to evaporate and absorbs the radiant heat from the side wall of the second chamber 6. The cooled air is filtered and compressed by the air inlet and then enters the second chamber 6 to replenish the drawn air, forming a complete air circulation. This achieves both forced convection heat dissipation and evaporative cooling insulation, greatly improving heat dissipation efficiency.

[0044] When the temperature inside the second housing 6 drops to a preset threshold (e.g., 30°C), the axial fan 19 stops running, the exhaust plate 11 falls back under gravity, sealing the exhaust hole 9, and the second housing 6 returns to a sealed protective state. The cavity interlayer continues to isolate external heat and moisture, achieving waterproof and heat insulation protection under all working conditions.

[0045] The above are merely preferred embodiments of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A waterproof and heat-insulating cable branch box, characterized in that, include: Protective components used to protect cable parts; Includes a protective box, one side of which is hinged with a door (1), and the inner cavity of the protective box is used to install cable components; The protective box has a cavity interlayer on its side wall; A heat dissipation assembly is used to draw air from the inner cavity of the protective box; it includes a heat dissipation box (2) and a radiator (3), wherein the radiator (3) is fixedly connected to the bottom surface of the inner cavity of the heat dissipation box (2), and the bottom surface of the heat dissipation box (2) is fixedly connected to the top surface of the protective box; the heat dissipation box (2) is hinged to the box door (1); Support components, used to support protective and heat dissipation components; Includes a base, with a wire hole (4) in the center of the base for cable to pass through, and the bottom surface of the heat sink (2) is fixedly connected to the top surface of the base.

2. The waterproof and heat-insulating cable branch box according to claim 1, characterized in that: The protective box includes a first box body (5) and a second box body (6). The first box body (5) is fitted on the outside of the second box body (6). The opening of the first box body (5) is fixedly connected to the opening of the second box body (6). The top surface of the first box body (5) is fixedly connected to the top surface of the second box body (6). One side of the opening of the first box body (5) is hinged to the box door (1). Ventilation holes (7) are respectively opened on the opposite side walls of the first box body (5). Water-absorbing cotton layers (8) are respectively fixedly connected to the opposite side walls of the second box body (6). The bottom end of the water-absorbing cotton layer (8) is set in the base. A plurality of air outlet holes (9) are opened on the top surface of the second box body (6). A plurality of air outlet components are provided on the outside of the air outlet holes (9). An air inlet component is fixedly connected and connected to one side wall of the second box body (6).

3. A waterproof and heat-insulating cable branch box according to claim 2, characterized in that: The venting component includes a sealing ring (10), and the vent hole (9) is disposed inside the sealing ring (10). The sealing ring (10) is fixedly connected to the top surface of the second housing (6). The top surface of the sealing ring (10) is detachably connected to an vent plate (11). One end of the vent plate (11) is hinged with several hinges (12). A wedge-shaped limiting block (13) is disposed between two adjacent hinges (12). The limiting block (13) is fixedly connected to the top surface of the second housing (6). The limiting block (13) is limitedly connected to one end face of the vent plate (11).

4. A waterproof and heat-insulating cable branch box according to claim 2, characterized in that: The air intake component includes an air intake frame (14), an air intake plate (15) is fixedly connected to the inner cavity of the air intake frame (14), and a compression hole (16) is opened on the end face of the air intake plate (15); a filter layer is provided on one side of the air intake plate (15), and the filter layer is detachably connected to the air intake frame (14).

5. A waterproof and heat-insulating cable branch box according to claim 2, characterized in that: The heat sink (2) has ventilation holes (17) on opposite side walls. The bottom surface of the inner cavity of the heat sink (2) is fixedly connected to the radiator (3). The radiator (3) is provided with several of them, including a guide tube (18). The guide tube (18) is fixedly connected to the top surface of the second box body (6). An axial flow fan (19) is fixedly connected to the inner cavity of the guide tube (18). The axial direction of the axial flow fan (19) is consistent with the axial direction of the ventilation hole (17).

6. A waterproof and heat-insulating cable branch box according to claim 2, characterized in that: The base includes a water storage tank (20) and an installation box (21). The top surface of the water storage tank (20) is fixedly connected to the bottom surface of the installation box (21). A water guide groove (22) is provided on the top surface of the installation box (21). The water guide groove (22) is connected to the inner cavity of the water storage tank (20). The water guide groove (22) is filled with a filter layer (23) for infiltration. The bottom end of the absorbent cotton layer (8) is located on the bottom surface of the inner cavity of the water storage tank (20). The thread hole (4) is opened in the inner cavity of the water storage tank (20).

7. A waterproof and heat-insulating cable branch box according to claim 2, characterized in that: The bottom surface of the second box (6) is fixedly connected to the bottom surface of the first box (5), and the second box (6) is closed and fixedly connected to the wire hole (4) and connected.

8. A waterproof and heat-insulating cable branch box according to claim 4, characterized in that: The compression hole (16) has a horn-shaped structure, and the larger diameter end of the compression hole (16) is set towards the first housing (5).

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