A cable branch box for smart grid

Abstract

The application relates to the technical field of cable branch boxes, and discloses a cable branch box for smart grids, which comprises a cabinet body, a buckle box and a rotating frame. Wind holes are arranged on the circumferential side of the cabinet body, and the wind holes are longitudinal long holes. The buckle box is fixedly arranged in the cabinet body and blocks the wind holes. First air holes are arranged on the buckle box, and the first air holes are coaxially arranged with the wind holes. The rotating frame is arranged on the cabinet body. First, second and third limiters are arranged on the cabinet body. When the rotating frame is located on the first limiter, one end of the rotating frame extends out of the wind hole, and the projection of the rotating frame on the inner wall of the buckle box does not block the first air hole. The dynamic heat dissipation structure composed of the wind holes, the buckle box and the rotating frame is arranged, efficient natural convection of airflow in normal state, detour protection in rainy and snowy weather in medium state and full-closed block in extremely severe weather are realized, and the heat dissipation effect and the protection capability are considered.

Description

Technical Field

[0001] This invention relates to the field of cable branch box technology, and more particularly to a cable branch box for smart grids. Background Technology

[0002] As a core direction for the development of modern power systems, the reliability of outdoor power distribution facilities in smart grids directly affects the stability of grid operation. Cable distribution boxes, as key node equipment in smart distribution networks, are mainly used for power distribution, control, and protection. They integrate a large number of precision electronic components such as cable control switches, monitoring sensors, and communication modules. These electronic components generate heat during long-term operation. If this heat cannot be dissipated in time, the internal temperature of the equipment will rise sharply, leading to accelerated aging of components, decreased insulation performance, and even short-circuit faults, seriously affecting power supply safety.

[0003] Existing cable distribution boxes have numerous limitations in terms of heat dissipation and protection. Traditional solutions mainly rely on fixed ventilation holes or forced air cooling equipment on the box. However, while fixed ventilation holes are simple in structure, they lack environmental adaptability. In harsh weather conditions such as rain, snow, and sandstorms, open ventilation holes easily become channels for rainwater intrusion and dust accumulation, leading to internal circuits becoming damp and short-circuited or overheating due to dust buildup. On the other hand, while using active cooling equipment such as fans can improve heat dissipation efficiency, it requires additional power supply and control circuitry, increasing energy consumption and maintenance costs. Moreover, mechanical components are prone to failure in complex outdoor environments, reducing the overall reliability of the system. Some existing technologies attempt to improve protection by adding rain covers or louvers, but these structures are mostly static designs and cannot dynamically adjust ventilation according to real-time weather conditions. This not only increases equipment costs but also introduces new points of failure, making it difficult to meet the stringent requirements of smart grids for high reliability, low power consumption, and maintenance-free outdoor equipment. Summary of the Invention

[0004] In view of this, the present invention proposes a cable branch box for smart grids, which can dynamically adjust the state of the heat dissipation structure according to real-time weather conditions, so as to balance the heat dissipation efficiency and environmental protection performance of the cable branch box.

[0005] The technical solution of this invention is implemented as follows: This invention provides a cable branch box for smart grids, including a cabinet, a snap-fit ​​box, and a rotating frame; the cabinet has ventilation holes on its periphery, the ventilation holes being longitudinal elongated holes; the snap-fit ​​box is fixedly disposed inside the cabinet and seals the ventilation holes, the snap-fit ​​box having a first air vent, and the first air vent being coaxially arranged with the ventilation hole; the rotating frame is disposed on the cabinet; the cabinet has a first limit, a second limit, and a third limit; when the rotating frame is located at the first limit, one end of the rotating frame extends out of the first limit. The air vent is fixedly connected to the cabinet body, and the projection of the rotating frame on the inner wall of the buckle box does not block the first air vent; when the rotating frame is located at the second limit position, the rotating frame abuts against and is fixed on the inner wall of the buckle box, and blocks the first air vent; when the rotating frame is located at the third limit position, the rotating frame is located inside the buckle box, does not block the first air vent, the projection of the rotating frame on the inner wall of the buckle box covers the first air vent, and when the driving force on the rotating frame is greater than a preset value, it can move from the third limit position to the second limit position.

[0006] Based on the above technical solutions, preferably, the cabinet includes a surrounding panel, a connecting plate, multiple first arc plates and multiple second arc plates; the air vents are opened on the surrounding panel; one end of the connecting plate is integrally formed on the side wall inside the air vent; the first arc plates and the second arc plates are both integrally formed on the end of the connecting plate away from the surrounding panel, and the multiple first arc plates and the multiple second arc plates are alternately arranged in the vertical direction.

[0007] Based on the above technical solutions, preferably, the rotating frame includes a rotating shaft and a first blade; the rotating shaft is rotatably and slidably disposed between the first arc plate and the second arc plate; the first blade is fixedly disposed on the rotating shaft and spaced apart from the first arc plate.

[0008] Based on the above technical solutions, preferably, the first limit, the third limit and the second limit are all groove-shaped structures and are sequentially opened on the top side of the first arc plate; the side walls of the first limit and the second limit are perpendicular to the horizontal plane, and the side wall of the third limit is inclined to the horizontal plane.

[0009] Based on the above technical solutions, preferably, the top side of the first blade and the top side of the rotating shaft are both spaced apart from the top side inside the buckle box.

[0010] Based on the above technical solutions, preferably, when the first blade is located on the first limit, the first blade is inclined to the surrounding plate.

[0011] Based on the above technical solutions, preferably, the buckle box is provided with a second air hole, the connecting plate is provided with a connecting hole, and the second air hole and the air hole are connected through the connecting hole; the rotating frame also includes a second blade, the second blade is fixedly disposed on the rotating shaft and located on the side of the connecting plate away from the first blade, and the second blade is spaced apart from the second arc plate; when the first blade is located on the first limit position, the second blade blocks the second air hole; when the first blade is located on the second limit position, the second blade blocks the connecting hole; when the first blade is located on the third limit position, the second blade is spaced apart inside the buckle box, and the projection of the second blade on the inner wall of the buckle box covers the second air hole.

[0012] Based on the above technical solutions, preferably, the buckle box is provided with a limiting groove, and both the first arc plate and the second arc plate are engaged with the limiting groove.

[0013] Based on the above technical solutions, preferably, the system also includes a mounting bracket and a connecting pipe. The cabinet includes a main frame and a surrounding panel. The mounting bracket is fixedly installed inside the main frame, and the surrounding panel is rotatably or fixedly installed on the main frame. A main air duct is provided inside the main frame, and multiple heat dissipation air ducts are provided inside the mounting bracket, with the multiple heat dissipation air ducts connected to the main air duct. The connecting pipe is fixedly installed on the top side of the snap-fit ​​box, and both ends of the connecting pipe are respectively connected to the interior of the snap-fit ​​box and the main air duct.

[0014] Based on the above technical solutions, preferably, multiple air vents, buckles, and rotating frames are provided, and they correspond one-to-one.

[0015] The cable branch box for smart grids of the present invention has the following advantages over the prior art: (1) By setting up a dynamic heat dissipation structure consisting of air holes, buckles and a rotating frame, it achieves efficient natural convection with direct airflow under normal conditions, detour protection in rain and snow weather under medium conditions, and full-sealed blockage under extreme weather conditions, taking into account both heat dissipation effect and protection capability.

[0016] (2) By designing the connecting plate, the first arc plate and the second arc plate as integrally formed with the surrounding plate, the plate inside the air hole can be directly bent to form the plate, eliminating the welding and assembly process, reducing manufacturing costs and processing cycle, and fundamentally avoiding weld defects and assembly accumulation errors, thereby improving the rigidity and sealing reliability of the overall structure.

[0017] (3) By setting up a connecting system of main air duct, heat dissipation air duct and hollow connecting pipe, and filling the main air duct with functional filler, a multi-protection path with ventilation, filtration, dehumidification and rain and snow intrusion prevention is constructed, realizing the continuous safe operation and efficient heat dissipation of the electronic components inside the cabinet under extreme climatic conditions. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a perspective view of a cable branch box for a smart grid according to the present invention.

[0020] Figure 2 This is a perspective view of the outer side of the enclosure of a cable branch box for a smart grid according to the present invention.

[0021] Figure 3 for Figure 2 Enlarged view of point A in the middle.

[0022] Figure 4 This is a transverse cross-sectional view of the air vent in a cable branch box for a smart grid according to the present invention, wherein the rotating frame is located on the second limit position.

[0023] Figure 5 This is a transverse cross-sectional view of the air vent in a cable branch box for a smart grid according to the present invention, wherein the rotating frame is located on the third limit position.

[0024] Figure 6 This is a transverse cross-sectional view of the air vent in a cable branch box for a smart grid according to the present invention, wherein the rotating frame is located on the first limit position.

[0025] Figure 7 This is a perspective view of the inner side of the enclosure panel of a cable branch box for smart grids according to the present invention.

[0026] Figure 8 for Figure 7 Enlarged view of point B in the middle.

[0027] Figure 9 for Figure 7 Enlarged view of point C in the middle.

[0028] Figure 10 This is a partial perspective view of a transfer frame in a cable branch box for smart grids according to the present invention.

[0029] Figure 11This is a partial perspective view of the main frame of a cable branch box for smart grids according to the present invention.

[0030] The components include: 1. Cabinet; 11. Main frame; 12. Enclosure panel; 13. Connecting plate; 14. First arc plate; 15. Second arc plate; 100. Main air duct; 110. First limit switch; 120. Second limit switch; 130. Third limit switch; 101. Air vent; 102. Connecting hole; 2. Buckle box; 201. First air vent; 202. Second air vent; 203. Limiting groove; 3. Rotating frame; 31. Rotating shaft; 32. First blade; 33. Second blade; 4. Mounting bracket; 400. Heat dissipation air duct; 5. Connecting pipe. Detailed Implementation

[0031] The technical solutions of this invention will be clearly and completely described below with reference to specific embodiments. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0032] This invention provides a cable branch box for a smart grid, comprising a cabinet 1 and a mounting frame 4. For example... Figure 1 As shown, the cabinet 1 includes a main frame 11 and multiple surrounding panels 12. The main frame 11 has a cavity inside, and openings are pre-set on its perimeter. The mounting bracket 4 is fixedly installed inside the main frame 11 as a load-bearing unit, used to fix key electronic components such as cable control switches, and to arrange the electronic components neatly.

[0033] The enclosure 12 is installed around the main frame 11 to seal the openings around the main frame 11, thereby forming a complete protective shell that effectively isolates the internal electronic components from external environmental corrosion. In terms of connection, the enclosure 12 can be fixedly connected to the main frame 11 to enhance the rigidity and sealing of the overall structure; it can also be rotatably connected to the main frame 11 to form a cabinet door or window, facilitating daily inspection and troubleshooting, and improving the convenience of on-site installation and the efficiency of subsequent operation and maintenance.

[0034] To effectively address the heat continuously generated by electronic components during operation and enhance the active heat dissipation capability and multi-environment adaptability of this cable branch box under complex working conditions of smart grids, this invention provides a longitudinally extending elongated air vent 101 on the enclosure 12 to form a basic ventilation channel; at the same time, a buckle box 2 and a rotating frame 3 are added, and the three work together to construct a dynamic heat dissipation structure.

[0035] like Figure 2As shown, the vent 101 is a longitudinally elongated opening. When the electronic components inside the main frame 11 generate heat, the hot air rises and, driven by buoyancy, is discharged outside the cabinet 1 through the upper-middle area of ​​the vent 101. At the same time, the relatively cooler air outside is drawn in by negative pressure and continuously enters the cabinet 1 from the lower-middle area of ​​the vent 101, forming a bottom-in, top-out convection circulation in the vertical cross-section. This longitudinal layout significantly increases the effective ventilation area and airflow action area, greatly improving the heat dissipation efficiency per unit area of ​​the vent 101. Furthermore, this natural convection mechanism reduces the reliance on active temperature control equipment such as air conditioners and fans inside the cabinet 1, resulting in significant energy saving and consumption reduction, and meeting the requirements of green and low-carbon operation and maintenance of new power systems.

[0036] The buckle box 2 is fixedly installed inside the enclosure 12 and blocks the air hole 101. The buckle box 2 has a first air hole 201 arranged coaxially with the air hole 101 on the side away from the enclosure 12. At the same time, the cabinet 1 is provided with three limiting structures, namely the first limit 110, the second limit 120 and the third limit 130. The rotating frame 3 is installed on the cabinet 1 and can be limited and engaged with the first limit 110, the second limit 120 and the third limit 130 respectively under the action of external force or driving mechanism.

[0037] like Figure 6 As shown, when the rotating frame 3 is located on the first limit 110, one end of the rotating frame 3 extends through the air hole 101 to the outside of the enclosure 12 and is fixedly connected to the cabinet 1. At this time, the orthographic projection of the rotating frame 3 on the inner wall of the buckle box 2 does not block the first air hole 201. The air hole 101 and the first air hole 201 are directly connected without obstruction. The airflow resistance inside and outside the cabinet 1 is minimized, and the natural convection intensity reaches its peak. At the same time, the extended section also has the function of a guide wing, which can disturb and guide the external horizontal airflow to converge into the air hole 101, further enhancing the air convection efficiency and the comprehensive heat dissipation capacity of this cable branch box.

[0038] like Figure 5 As shown, when the fixed connection between the rotating frame 3 and the cabinet 1 is released, and the rotating frame 3 is positioned on the third limit 130, the rotating frame 3 is entirely located inside the buckle box 2, does not extend beyond the outer wall of the enclosure 12, and has a gap with the inner wall of the buckle box 2. At this time, the rotating frame 3 is located in the airflow channel between the air vent 101 and the first air vent 201, and its orthographic projection on the inner wall of the buckle box 2 completely covers the first air vent 201, physically blocking the direct path, forcing the external airflow to bypass the gap around the rotating frame 3 before entering the cabinet 1. This detour path can effectively improve the ability to prevent rain and snow from entering, and enhance the protective performance while taking into account heat dissipation.

[0039] When the rotating frame 3 is located on the third limit 130, it is not fixedly connected to the cabinet 1. Under the action of external force (such as strong wind pressure, heavy rain or snow, etc., the driving force is greater than the preset protection value), it moves from the third limit 130 to the second limit 120. Figure 4As shown, at this time, the rotating frame 3 abuts against and is fixed on the inner wall of the buckle box 2, and blocks the first air hole 201, completely cutting off the communication path between the air hole 101 and the internal cavity of the cabinet 1, ensuring the absolute safety and reliable operation of the internal electrical components under extreme weather conditions (such as blizzards, rainstorms, and sandstorms).

[0040] In summary, this heat dissipation structure achieves three-level adaptive switching: high-efficiency heat dissipation under normal conditions, rain and snow protection under medium conditions, and full enclosure under extreme conditions, through airflow guidance optimization of the vent 101, airflow rectification and spatial reconstruction of the buckle 2, and three-level limit opening and closing control of the rotating frame 3. It combines structural simplicity with real-time response. This design requires no additional actuators or electrical control systems and is purely mechanical in response. It has outstanding advantages such as high reliability, zero power consumption, and maintenance-free operation. It is suitable for outdoor unattended, wide-temperature-range, and high-protection-level application scenarios in smart power distribution networks.

[0041] In a preferred embodiment, the cabinet 1 further includes a connecting plate 13, a first arc plate 14, and a second arc plate 15. The rotating frame 3 includes a rotating shaft 31 and a first blade 32. The connecting plate 13 is fixedly disposed inside the enclosure 12. The first arc plate 14 and the second arc plate 15 are both fixedly disposed on the connecting plate 13. The first arc plate 14 and the second arc plate 15 enclose a bearing cavity with a circular cross-section. The rotating shaft 31 rotates and slides within the bearing cavity. The first blade 32 is fixedly disposed on the rotating shaft 31 and is spaced apart from the first arc plate 14 and the second arc plate 15.

[0042] At this time, the first limit 110, the third limit 130, and the second limit 120 are all groove-shaped structures and are sequentially opened on the top side of the first arc plate 14. The first blade 32 can be inserted into the first limit 110, the third limit 130, and the second limit 120 respectively to switch the relative state of the rotating frame 3 with the buckle box 2 and the cabinet 1.

[0043] like Figure 9 As shown, the sidewall inside the first limit 110 is perpendicular to the horizontal plane. When the first blade 32 enters the first limit 110, its sidewall tightly abuts against the sidewall, forming a circumferential limit. At this time, the first blade 32 is rigidly fixed to the surrounding plate 12, preventing the first blade 32 from rotating freely. To achieve state switching, the top side of the first blade 32 and the top side of the rotating shaft 31 are spaced apart from the top side inside the buckle box 2. During operation, simply slide the first blade 32 vertically upward to disengage it from the first limit 110 to release the circumferential limit, allowing the first blade 32 to rotate circumferentially and enter the third limit 130.

[0044] The side wall within the third limit 130 is inclined to the horizontal plane. In light rain or light snow, the external driving force is small, and the first blade 32 rotates slightly on the inclined side wall. After the external driving force disappears, the first blade 32 rotates back to its original position under the action of gravity. In heavy rain or heavy snow, the external driving force exceeds the preset value, pushing the first blade 32 to climb up the side wall of the third limit 130 and eventually enter the second limit 120.

[0045] The sidewall inside the second limit 120 is also perpendicular to the horizontal plane. When the first blade 32 enters the second limit 120, the sidewall inside the second limit 120 tightly abuts against the sidewall of the first blade 32, thereby achieving circumferential limitation of the first blade 32, making the first blade 32 rigidly fixed to the enclosure 12, and preventing the first blade 32 from swaying back and forth. After the heavy rain or snow, the first blade 32 can be slid vertically upward to disengage it from the second limit 120, thereby releasing the circumferential limitation, so that the first blade 32 can be turned into the third limit 130 or the first limit 110.

[0046] In summary, this structure enables tool-free, low-intervention three-state switching of the rotating frame 3, which not only supports convenient adjustments by maintenance personnel during routine inspections, but also has the ability to intelligently perceive and respond to external environmental loads, meeting the core requirements of unattended operation and long-term reliable operation of smart grid equipment.

[0047] Furthermore, such as Figure 6 As shown, when the first blade 32 is located on the first limit 110, the first blade 32 is inclined to the enclosure 12, making it easier to introduce the lateral airflow into the air hole 101.

[0048] like Figure 5 , Figure 9 and Figure 10 As shown, one end of the connecting plate 13 is integrally formed with one of the side walls inside the vent 101. Multiple first arc plates 14 and second arc plates 15 are provided, all integrally formed on the end of the connecting plate 13 away from the enclosure 12, and alternately arranged vertically. That is, the connecting plate 13, first arc plates 14, and second arc plates 15 are not additional components welded or screwed on later, but are directly extended from the sheet material reserved in the vent 101 forming process of the enclosure 12 through a bending process. The raw materials of the connecting plate 13, first arc plates 14, and second arc plates 15 are entirely derived from the material inside the vent 101 of the enclosure 12. Multiple bends are performed according to a preset trajectory using CNC bending equipment, eliminating the need for additional material preparation, cutting, stamping, or machining. This not only significantly reduces the manufacturing cost and processing cycle of structural components for a single cabinet 1, but also fundamentally eliminates quality risks such as weld defects, loose riveting, and accumulated assembly errors, combining outstanding process simplicity, cost economy, and structural reliability.

[0049] The first arc plate 14 and the second arc plate 15 are symmetrical about the connecting plate 13, and the central angles corresponding to the first arc plate 14 and the second arc plate 15 are both greater than 180 degrees, so that the two arc plates form a "double C embrace" guide cavity with deep containment in space, which greatly improves the dual constraint stiffness of the axial sliding and circumferential rotation of the rotating shaft 31 and effectively suppresses the micro-shaking under high frequency vibration.

[0050] like Figures 4-6 and Figure 9 As shown, the buckle box 2 is further provided with a second air hole 202, which is located on both sides of the connecting plate 13, along with the first air hole 201. The connecting plate 13 is provided with a connecting hole 102, through which the second air hole 202 and the air hole 101 are connected. Air from outside the cabinet 1 can flow into the cabinet 1 sequentially along the air hole 101, the connecting hole 102, and the second air hole 202. The rotating frame 3 also includes a second blade 33, which is fixedly mounted on the rotating shaft 31 and located on the side of the connecting plate 13 away from the first blade 32. The second blade 33 is spaced apart from the first arc plate 14 and the second arc plate 15, and also spaced apart from the inner wall of the buckle box 2.

[0051] like Figure 6 As shown, when the first blade 32 is positioned on the first limit 110, the second blade 33 blocks the second vent 202, and gas exchange between the inside and outside of the cabinet 1 occurs only through the vent 101 and the first vent 201; Figure 5 As shown, when the first blade 32 is located on the third limit 130, the projection of the second blade 33 on the inner wall of the latch box 2 covers the second vent 202. The gas flowing from the connecting hole 102 to the second vent 202 must bypass the second blade 33, which not only increases the gas flow area but also prevents rain and snow from falling into the cabinet 1; Figure 4 As shown, when the first blade 32 is located on the second limit 120, the second blade 33 blocks the connection hole 102, thereby blocking the gas exchange between the inside and outside of the cabinet 1.

[0052] like Figure 6 As shown, the buckle box 2 is provided with a longitudinally extending limiting groove 203, and the first arc plate 14 and the second arc plate 15 are both engaged with the limiting groove 203. This engagement not only improves the installation accuracy of the buckle box 2 and eliminates the risk of failure such as misalignment of the first air hole 201 and the air hole 101 and airflow short circuit caused by the buckle box 2 offset, but also clamps the first arc plate 14 and the second arc plate 15, improving the structural stability of the first arc plate 14 and the second arc plate 15.

[0053] like Figure 1 As shown, multiple air vents 101 are evenly distributed on the periphery of the cabinet 1. Each air vent 101 is equipped with a matching buckle box 2 and a rotating bracket 3. This matrix layout enhances the heat dissipation capacity of the cable branch box.

[0054] To further enhance the adaptability of this cable branch box, the present invention provides a main air duct 100 within the main frame 11, a heat dissipation air duct 400 within the mounting bracket 4, and a hollow connecting pipe 5 fixedly installed on the top side of the junction box 2, with the lower end of the connecting pipe 5 connected to the interior of the junction box 2; Figure 11 As shown, one end of the main air duct 100 is located above the enclosure 12. When the enclosure 12 is assembled on the main frame 11, the upper end of the connecting pipe 5 is connected to the main air duct 100. One end of the heat dissipation air duct 400 faces the electronic components, and the other end is located on the top side of the mounting bracket 4 and is connected to the other end of the main air duct 100. The main air duct 100 can be filled with filler with filtering and water absorption functions, so that the main air duct 100 has four functions: ventilation, filtration, dehumidification, and protection against rain and snow intrusion. Through this structural design, not only can the external wind force push the first blade 32 to fit against the inner wall of the buckle box 2, but it can also maintain ventilation inside and outside the cabinet 1 under extreme weather conditions, thereby improving the heat dissipation effect.

[0055] The working principle of a smart grid cable branch box according to the present invention is as follows: Normal high-efficiency heat dissipation mode: When the electronic components inside the cabinet are operating normally, the temperature rise is moderate, and the external weather is good, the first blade 32 is inserted into the first limit 110, and its side wall is tightly abutted against the vertical side wall inside the first limit 110 to achieve circumferential rigid fixation; at this time, the second blade 33 blocks the second air hole 202, and one end of the first blade 32 extends to the outside of the enclosure 12. The air hole 101 and the first air hole 201 are unobstructed and directly connected, with minimal airflow resistance. Hot air is discharged through the middle and upper part of the air hole 101 under the action of buoyancy, and cold air is replenished from the middle and lower part, forming a "bottom in and top out" natural convection; at the same time, the extended section also functions as a guide wing to guide the horizontal airflow into the air hole 101, further improving the heat dissipation efficiency.

[0056] Medium-level rain and snow protection mode: The first blade 32 is moved into the third limit 130. In light rain or light snow, the external driving force is small. The first blade 32 rotates slightly on the inclined side wall of the third limit 130. After the driving force disappears, it automatically resets under the action of gravity. At this time, the first blade 32 blocks the direct path between the first air hole 201 and the wind hole 101, and the second blade 33 blocks the direct path between the second air hole 202 and the wind hole 101. This forces the external airflow to detour around the rotating frame 3 before flowing into the cabinet 1, extending the flow channel and reducing the flow velocity, effectively inhibiting the intrusion of rain and snow, and taking into account both ventilation and basic protection.

[0057] Extreme fully enclosed protection mode: When encountering extreme weather such as heavy rain, blizzard or sandstorm, the external driving force exceeds the preset protection value, pushing the first blade 32 to climb along the third limit 130 and cross over to the second limit 120; the inner wall of the second limit 120 is a vertical structure, so that the first blade 32 regains circumferential rigid limit and seals the first air hole 201; at the same time, the second blade 33 simultaneously seals the connection hole 102, realizing complete isolation between the inside and outside of the cabinet 1, ensuring the absolute safety and reliable operation of the internal electrical components under extreme working conditions.

[0058] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A cable branch box for smart grids, characterized in that: The system includes a cabinet (1), a snap-fit ​​box (2), and a rotating frame (3); the cabinet (1) has air vents (101) on its periphery, and the air vents (101) are longitudinal elongated holes; the snap-fit ​​box (2) is fixedly installed inside the cabinet (1) and blocks the air vents (101), and the snap-fit ​​box (2) has a first air vent (201) on it, and the first air vent (201) is coaxially arranged with the air vent (101); the rotating frame (3) is installed on the cabinet (1); The cabinet (1) is provided with a first limit (110), a second limit (120) and a third limit (130); when the rotating frame (3) is located on the first limit (110), one end of the rotating frame (3) extends out of the air hole (101) and is fixedly connected to the cabinet (1), and the projection of the rotating frame (3) on the inner wall of the buckle box (2) does not block the first air hole (201); when the rotating frame (3) is located on the second limit (120), the rotating frame (3) abuts against and is fixed. On the inner wall of the buckle box (2), the first air hole (201) is blocked; when the rotating frame (3) is located on the third limit (130), the rotating frame (3) is located inside the buckle box (2) and does not block the first air hole (201). The projection of the rotating frame (3) on the inner wall of the buckle box (2) covers the first air hole (201), and when the driving force of the rotating frame (3) is greater than the preset value, it can move from the third limit (130) to the second limit (120).

2. The cable branch box for smart grids as described in claim 1, characterized in that: The cabinet (1) includes a surrounding panel (12), a connecting plate (13), a plurality of first arc plates (14) and a plurality of second arc plates (15); the air vent (101) is opened on the surrounding panel (12); one end of the connecting plate (13) is integrally formed on the side wall inside the air vent (101); the first arc plate (14) and the second arc plate (15) are both integrally formed on the end of the connecting plate (13) away from the surrounding panel (12), and the plurality of first arc plates (14) and the plurality of second arc plates (15) are alternately arranged in the vertical direction.

3. A cable branch box for a smart grid as described in claim 2, characterized in that: The rotating frame (3) includes a rotating shaft (31) and a first blade (32); the rotating shaft (31) is rotatably and slidably disposed between the first arc plate (14) and the second arc plate (15); the first blade (32) is fixedly disposed on the rotating shaft (31) and spaced apart from the first arc plate (14).

4. A cable branch box for a smart grid as described in claim 3, characterized in that: The first limit (110), the third limit (130) and the second limit (120) are all groove-shaped structures and are sequentially opened on the top side of the first arc plate (14); the side walls of the first limit (110) and the second limit (120) are perpendicular to the horizontal plane, and the side wall of the third limit (130) is inclined to the horizontal plane.

5. A cable branch box for a smart grid as described in claim 4, characterized in that: The top side of the first blade (32) and the top side of the rotating shaft (31) are both spaced apart from the top side inside the buckle box (2).

6. A cable branch box for a smart grid as described in claim 4, characterized in that: When the first blade (32) is located on the first limit (110), the first blade (32) is inclined to the enclosure (12).

7. A cable branch box for a smart grid as described in claim 3, characterized in that: The buckle box (2) is provided with a second air hole (202), the connecting plate (13) is provided with a connecting hole (102), and the second air hole (202) and the air hole (101) are connected through the connecting hole (102); The rotating frame (3) further includes a second blade (33), which is fixedly mounted on the rotating shaft (31) and located on the side of the connecting plate (13) away from the first blade (32). The second blade (33) is spaced apart from the second arc plate (15). When the first blade (32) is located on the first limit (110), the second blade (33) blocks the second air hole (202). When the first blade (32) is located on the second limit (120), the second blade (33) blocks the connecting hole (102). When the first blade (32) is located on the third limit (130), the second blade (33) is spaced apart inside the buckle box (2), and the projection of the second blade (33) on the inner wall of the buckle box (2) covers the second air hole (202).

8. A cable branch box for a smart grid as described in claim 2, characterized in that: The buckle box (2) is provided with a limiting groove (203), and the first arc plate (14) and the second arc plate (15) are both engaged with the limiting groove (203).

9. A cable branch box for a smart grid as described in claim 1, characterized in that: It also includes a mounting bracket (4) and a connecting pipe (5). The cabinet (1) includes a main frame (11) and a surrounding panel (12). The mounting bracket (4) is fixedly installed inside the main frame (11). The surrounding panel (12) is rotatably or fixedly installed on the main frame (11). The main frame (11) is provided with a main air duct (100). The mounting bracket (4) is provided with multiple heat dissipation air ducts (400), and the multiple heat dissipation air ducts (400) are connected to the main air duct (100). The connecting pipe (5) is fixedly installed on the top side of the buckle box (2). The two ends of the connecting pipe (5) are respectively connected to the interior of the buckle box (2) and the main air duct (100).

10. A cable branch box for a smart grid as described in claim 1, characterized in that: The air vent (101), the buckle box (2), and the rotating frame (3) are all provided with multiple vents, and they correspond one to one.

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