A cable branch box with a double-class compartment structure

Abstract

The application relates to the technical field of cable branch boxes, and discloses a cable branch box with a double-class compartment structure, which is additionally provided with two outer baffles, two groups of inner baffles, five compartments and at least three signal columns. The two outer baffles are respectively arranged at the front side of the wiring board at the most front side and the rear side of the wiring board at the most rear side. The two groups of inner baffles are respectively arranged between adjacent wiring boards, each group of inner baffles comprises two symmetrically arranged inner baffles, and the inner baffles are wave plates. The five compartments comprise three electrical compartments and two insulation compartments. The three-phase wiring boards are respectively arranged in different electrical compartments formed between the inner baffles and the outer baffles. The insulation compartments are formed between the two inner baffles in one group of inner baffles. The at least three signal columns are arranged in the two insulation compartments, the outer wall of the signal column abuts against the concave surface of the inner baffle, and the signal column is used for detecting the temperature of the wiring board and performing alarm. The double-class compartment structure is arranged, and the functions of high insulation, high heat dissipation, high stability and independent monitoring are integrated.

Description

Technical Field

[0001] This invention relates to the field of cable branch box technology, specifically to a cable branch box with a dual-compartment structure. Background Technology

[0002] With the accelerated cabling of power distribution networks and the increasing urban electricity load, cable distribution boxes, as key equipment used for cable branching, switching, and circuit control in power distribution lines, are seeing their application scope continuously expand. Traditional cable distribution boxes mainly serve the function of physical branching of cables, and their internal structure is relatively simple, typically containing only a terminal block for connecting main and branch cables and necessary protective switches.

[0003] However, existing cable distribution boxes have revealed numerous problems in practical applications. First, regarding electrical insulation performance, the phase-to-phase insulation inside traditional distribution boxes relies mainly on air gaps. The confined internal space makes them highly susceptible to environmental factors (such as condensation and pollution) that can easily lower insulation levels, leading to surface discharge or phase-to-phase short circuits, posing serious safety hazards. Some improvement solutions attempt to isolate conductors by adding flat baffles, but the creepage distance provided by the flat structure within the limited space is limited, and it cannot effectively suppress the spread of arcs along the baffle surface.

[0004] Secondly, regarding heat dissipation, the increased number of electrical components integrated into cable distribution boxes, such as main incoming circuit breakers, branch circuit breakers, and terminal blocks, leads to a significant increase in heat generation during operation. Traditional distribution boxes often rely on natural ventilation or ventilation holes, resulting in poor heat dissipation. Especially when multiple phase terminal blocks are closely arranged, heat easily accumulates inside the box and interferes with each other, causing excessively high internal temperatures, accelerating component aging, and reducing equipment lifespan. Some solutions propose using fans or ducts for forced ventilation and cooling, or using heat-conducting rods to transfer heat to the underground soil; however, these solutions are structurally complex, increasing energy consumption or installation difficulty.

[0005] Furthermore, regarding structural stability and ease of maintenance, the terminal blocks of existing cable distribution boxes are prone to lateral displacement under installation stress, cabinet vibration, or short-circuit electrodynamic forces, which may lead to changes in phase-to-phase distance and increase the risk of short circuits. At the same time, some distribution boxes suffer from cumbersome assembly and disassembly, and inadequate cable fixing and management, causing inconvenience for later inspection and maintenance.

[0006] Furthermore, the need for real-time monitoring and early warning of conditions such as temperature and faults inside cable distribution boxes is becoming increasingly urgent. Currently, the signal posts, sensors, and other components used for monitoring are usually directly exposed in the electrical compartment, making them susceptible to strong electric field interference, which affects the accuracy of monitoring. In addition, the space they occupy may interfere with the original insulation structure.

[0007] In summary, existing technologies lack a cable branch box structure that can effectively balance high insulation reliability, efficient heat dissipation, structural stability, and ease of installation of monitoring components. Therefore, it is necessary to optimize the internal layout and structure of existing cable branch boxes to address these technical issues. Summary of the Invention

[0008] (a) Technical problems to be solved To address the shortcomings of existing technologies, this invention provides a cable branch box with a dual-compartment structure. By setting up the dual-compartment structure, combined with a corrugated inner baffle and signal posts, it achieves high insulation reliability, efficient independent heat dissipation, stable limit of the terminal block, and safe integration of monitoring elements. This solves the problems of insufficient interphase insulation, poor heat dissipation, easy displacement of the terminal block, and easy interference of monitoring elements in traditional cable branch boxes.

[0009] (II) Technical Solution To achieve the above objectives, the present invention provides the following technical solution: A cable branch box with a dual-compartment structure includes a box body and mounting brackets installed inside the box body. A main incoming circuit breaker and multiple branch circuit breakers are mounted on the mounting brackets. The branch circuit breakers are horizontally spaced on the same mounting brackets. The main incoming circuit breaker is mounted on a mounting bracket above the branch circuit breakers. The three-phase outgoing lines of the main incoming circuit breaker are connected to three terminal blocks spaced apart front and rear. The three-phase incoming lines of the branch circuit breakers are connected to the corresponding phase terminal blocks. The cable branch box also includes: Two outer baffles are respectively located on the front side of the frontmost terminal block and the rear side of the rearmost terminal block; Two sets of inner baffles are respectively set between adjacent wiring boards. Each set of inner baffles includes two symmetrically arranged inner baffles, and the inner baffles are corrugated plates. Five compartments, including three electrical compartments and two insulating compartments. The three-phase terminal blocks are located in different electrical compartments formed between the inner and outer baffles. An insulating compartment is formed between two inner baffles in a set of inner baffles. At least three signal posts are installed in two insulated compartments. The outer wall of the signal posts abuts against the concave surface of the inner baffle and are used to detect the temperature of the terminal block and trigger an alarm.

[0010] Preferably, the cable branch box is equipped with three signal posts, which are staggered in two insulating compartments. Each of the three signal posts is equipped with a temperature probe, which passes through the inner baffle and is exposed in different electrical compartments. The three signal posts also contain: The controller has a built-in wireless communication module for sending temperature data to a remote monitoring terminal. Alarm devices, including audible and visual alarms installed on top of signal posts; The low-voltage power supply module is installed on the mounting bracket or cable branch box and is used to power the controller. The signal column has a hollow structure with a wire channel inside. The temperature probe is electrically connected to the controller through a wire passing through the wire channel.

[0011] Preferably, the inner baffle is a corrugated insulating plate, on which multiple arc-blocking ridges are uniformly arranged vertically on the convex surface facing the electrical compartment, and the arc-blocking ridges are arranged perpendicular to the wave direction of the corrugated plate. Among the arc-blocking protrusions on each convex surface, the two arc-blocking protrusions closest to the upper and lower edges of the terminal block are limiting protrusions. The inner end face of the arc-blocking protrusions is attached to the upper and lower sides of the corresponding terminal block, and the remaining arc-blocking protrusions are distributed vertically at equal intervals between the two limiting protrusions.

[0012] Preferably, the two outer baffles and the two sets of inner baffles are all vertically fixed to the two side plates of the mounting bracket by insulating fasteners.

[0013] Preferably, the inner baffle uses a wave plate with a continuous arc transition sinusoidal waveform structure, and the position of the wave crest on the side facing the electrical compartment corresponds to the side profile of the terminal block. The end face of the wave crest abuts against the side of the terminal block or leaves a gap.

[0014] Preferably, both the outer baffle and the inner baffle are made of transparent insulating material.

[0015] Preferably, the inner baffle has a through-hole for the temperature probe at the corresponding installation position, the temperature probe is inserted into the corresponding installation hole, and an insulating sealing sleeve is provided between the outer wall of the temperature probe and the inner wall of the installation hole, the two ends of the insulating sealing sleeve are flush with the two side surfaces of the inner baffle.

[0016] Preferably, the three signal columns are arranged in a staggered manner, with two signal columns in the front insulating compartment, corresponding to the frontmost and middle electrical compartments respectively, and one signal column in the rear insulating compartment, corresponding to the rearmost electrical compartment. The central axes of the three signal columns are not on the same transverse section.

[0017] Preferably, the arc-blocking ridge and the inner baffle are integrally insulated molded structures.

[0018] Preferably, the cross-section of the arc-blocking convex ridge is trapezoidal with a wide root and a narrow end, and all edges of the arc-blocking convex ridge are rounded.

[0019] (III) Beneficial Effects Compared with the prior art, the present invention provides a cable branch box with a dual-compartment structure, which has the following advantages: 1. This cable branch box with a dual-compartment structure forms three electrical compartments and two insulation compartments by setting two outer baffles and two sets of inner baffles. The insulation compartments not only enhance the insulation between adjacent two-phase terminals through a combination of solid insulation and air gaps, but also allow the signal posts used to monitor electrical conditions to be placed in the insulation compartments, so that the signal posts are not affected by the electrical properties of the insulation compartments.

[0020] 2. This cable branch box with a dual-compartment structure, by setting the inner baffle as a corrugated plate, can not only use the corrugated protrusions to form an edge limiting mechanism for the terminal block, but also use the space between the symmetrical corrugated plates to accommodate the signal column. At the same time, the concave and convex structure of the corrugated plate increases the surface distance (creep distance) in a limited space, which is more effective than the flat plate form in suppressing surface creepage and the spread of arc between adjacent phases.

[0021] 3. This cable branch box with a dual-compartment structure provides reliable limiting support for the inner baffle by abutting the signal post against the concave surface of the corrugated plate. This effectively constrains the deformation and swaying of the corrugated plate caused by vibration or electrodynamic force, thereby ensuring the stable limiting effect on the terminal block.

[0022] 4. This cable branch box with a dual-compartment structure has three electrical compartments and two insulation compartments. The three independent electrical compartments physically isolate the heat generated by each phase terminal block, avoiding the lateral superposition and mutual interference of heat. Each compartment forms an independent microenvironment, and its specific airflow channels (such as possible ventilation openings or natural convection paths above and below the compartment) can more effectively remove the heat generated by a single phase from the box through the chimney effect.

[0023] 5. This cable branch box with a dual-compartment structure features signal posts staggered within two insulated compartments, with alarm devices (such as indicator lights of different colors) spatially distributed. When a fault occurs in an electrical compartment, its corresponding alarm device will illuminate. Operators can easily and accurately locate the faulty phase by observing the spatial position of the alarm devices (e.g., the left signal post illuminates for phase A, the middle for phase B, and the right for phase C) through the observation window or by opening the box door, eliminating the need for individual instrument measurements. Furthermore, the staggered design prevents the operator's view from being obstructed by the signal posts, improving ease of observation.

[0024] 6. This cable branch box with a dual-compartment structure, by setting temperature probes on staggered signal posts, with each temperature probe connected to a different electrical compartment, on the one hand, the staggered signal posts can prevent the temperature probes from being on the same straight line, reducing the possibility of electrical breakdown; on the other hand, the staggered signal posts can make it easier for operators to observe the indication positions of the alarm devices separately.

[0025] 7. This cable branch box with a dual-compartment structure, by setting arc-blocking ridges, on the one hand, forms a multi-level, stepped creepage path on the convex surface, which, combined with the vertical wave-shaped structure of the inner baffle, achieves two-dimensional composite creepage blocking; on the other hand, the arc-blocking ridges form a bidirectional limiting constraint, stabilizing the compartment structure and detection accuracy; finally, the arc-blocking ridges can also improve the strength of the baffle structure and optimize the support stability. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0027] Figure 2 This is a schematic diagram of the terminal block and internal circuit breaker in an existing cable branch box.

[0028] Figure 3 This is a schematic diagram of the structure of the present invention after setting outer baffles and inner baffles before and after the terminal block.

[0029] Figure 4 This is a schematic diagram of the structure of the junction box, outer baffle, inner baffle and signal post of the present invention.

[0030] Figure 5 For the present invention Figure 4 Exploded view of the structure.

[0031] Figure 6 For the present invention Figure 4 Top view of the structure.

[0032] Figure 7 This is a schematic diagram of the structure of the inner baffle and signal post of the present invention.

[0033] Figure 8 This is a schematic diagram of the structure of the junction box and inner baffle of the present invention.

[0034] Figure 9 This is a side view of the junction box and inner baffle of the present invention.

[0035] In the diagram: 1. Enclosure; 11. Mounting bracket; 2. Main incoming circuit breaker; 3. Branch circuit breaker; 4. Terminal block; 5. Outer baffle; 6. Inner baffle; 61. Arc-damping protrusion; 611. Limiting protrusion; 7. Electrical compartment; 8. Insulation compartment; 9. Signal post; 91. Temperature probe. Detailed Implementation

[0036] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0037] In the description of this invention, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0038] In addition, a fixed connection refers to a connection in which parts or components are fixed and there is no relative movement; a transmission connection refers to a connection in which mechanical motion or torque is transmitted to other working parts through a transmission component; a sliding connection refers to a connection in which two objects are in contact but not fixed and can slide relative to each other; and a rotational connection refers to a connection in which two objects are in contact but not fixed and can rotate relative to each other.

[0039] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0040] Example 1: This embodiment provides a cable branch box with a dual-compartment structure, which has the following technical features.

[0041] like Figure 2 The diagram shows the structure of the terminal block 4 and internal circuit breakers in an existing cable branch box. The cable branch box includes a box body 1 and a mounting bracket 11 installed inside the box body 1. The mounting bracket 11 is equipped with a main incoming circuit breaker 2 and multiple branch circuit breakers 3. Each branch circuit breaker 3 is horizontally spaced on the same mounting bracket 11. The main incoming circuit breaker 2 is installed on the mounting bracket 11 above the branch circuit breakers 3. The three-phase outgoing lines of the main incoming circuit breaker 2 are respectively connected to three terminal blocks 4 that are spaced apart front and rear. The three-phase incoming lines of the branch circuit breakers 3 are respectively connected to the terminal blocks 4 of the corresponding phases.

[0042] Please see Figures 1-7 The cable branch box is also equipped with: Two outer baffles 5 are respectively set on the front side of the frontmost terminal block 4 and the rear side of the rearmost terminal block 4; Two sets of inner baffles 6 are respectively set between adjacent wiring boards 4. Each set of inner baffles 6 includes two symmetrically arranged inner baffles 6, and the inner baffles 6 are corrugated plates. Five compartments, including three electrical compartments 7 and two insulating compartments 8. The three-phase terminal block 4 is located in different electrical compartments 7 formed between the inner baffle 6 and the outer baffle 5. An insulating compartment 8 is formed between two inner baffles 6 in a set of inner baffles 6. At least three signal posts 9 are installed in two insulating compartments 8. The outer wall of the signal post 9 abuts against the concave surface of the inner baffle 6, and is used to detect the temperature of the terminal block 4 and trigger an alarm.

[0043] Furthermore, the two outer baffles 5 and the two sets of inner baffles 6 are all vertically fixed to the two side plates of the mounting bracket 11 by insulating fasteners. The upper and lower edges of each baffle are tightly fitted with the upper and lower crossbeams of the mounting bracket 11. In order to ensure the installation position accuracy of each baffle, and at the same time to seal the assembly gap of the baffle edge, to prevent airflow and arcing between adjacent compartments through the gap, the spatial independence of the electrical compartment 7 and the insulating compartment 8 is guaranteed.

[0044] Furthermore, the inner baffle 6 uses a wave plate with a continuous arc transition sinusoidal waveform structure. The position of the wave crest on the side facing the electrical compartment 7 corresponds to the side profile of the terminal block 4. The end face of the wave crest abuts against the side of the terminal block 4 or leaves a gap. Its function is to expand the limiting contact area by fitting the arc surface, avoid stress concentration on the edge and scratching the surface insulation layer of the terminal block 4, and at the same time stabilize and constrain the lateral displacement of the terminal block 4 to ensure a constant phase-to-phase insulation distance.

[0045] Furthermore, each electrical compartment 7 and insulation compartment 8 has an independent ventilation opening at its upper and lower ends. The ventilation opening is located at the upper and lower crossbeams of the mounting bracket 11, and the opening range matches the vertical channel of the corresponding compartment. Its function is to make each compartment form an independent vertical airflow channel, enhance the chimney heat dissipation effect of the compartment, and ensure that the heat generated by each phase terminal block 4 can be independently discharged from the box 1, avoiding the horizontal superposition and interference of heat between phases.

[0046] Furthermore, the top of the signal column 9 is fixedly installed on the upper crossbeam of the mounting bracket 11. The column body is arranged vertically. The concave surfaces of the two symmetrical inner baffles 6 in the same insulating compartment 8 abut against the outer wall of the signal column 9. Their function is to ensure that the signal column 9 is installed stably. At the same time, the symmetrical abutment on both sides provides balanced support for the two inner baffles 6, counteracts the force of the electrical compartments 7 on both sides, and effectively restrains the deformation and shaking of the inner baffles 6 caused by vibration or electrodynamic force.

[0047] Furthermore, both the outer baffle 5 and the inner baffle 6 are made of transparent insulating material, such as transparent plastic sheet. Both the outer baffle 5 and the inner baffle 6 are integrally molded using flame-retardant insulating material. The surface of the sheet is provided with a water-repellent insulating coating, which serves to ensure the insulation performance and flame-retardant capability of the baffle itself, while preventing condensation inside the box 1 from forming a water film on the baffle surface, reducing the risk of surface creepage, and improving the reliability of phase-to-phase insulation.

[0048] Working principle: During assembly, the mounting bracket 11 is first fixed inside the box 1 of the cable branch box. The main incoming circuit breaker 2 is installed in the upper area of ​​the mounting bracket 11, and multiple branch circuit breakers 3 are fixed at intervals along the horizontal direction in the lower area of ​​the mounting bracket 11. Then, the three-phase outgoing lines of the main incoming circuit breaker 2 are connected to three terminal blocks 4 arranged at intervals. The three-phase incoming lines of each branch circuit breaker 3 are connected to the terminal block 4 of the same phase, thus completing the basic assembly of the main circuit conductive structure. Subsequently, the baffle structure is installed. The two outer baffles 5 and the two sets of inner baffles 6 are vertically fixed to the two side plates of the mounting bracket 11 by insulating fasteners. The position of each baffle is adjusted so that the upper and lower edges are tightly fitted with the upper and lower crossbeams of the mounting bracket 11. The baffles are arranged in the front-to-back direction as the front outer baffle 5, the first set of inner baffles 6, the second set of inner baffles 6, and the rear outer baffle 5. Each set of inner baffles 6 consists of two corrugated plates with a continuous arc transition sine wave symmetrically arranged opposite each other. After assembly, the adjacent baffles are separated to form five independent chambers. The three terminal blocks 4 are respectively located in the three chambers between the outer baffle 5 and the outer side plate of the adjacent inner baffle 6, and between the outer side plate of the two sets of inner baffles 6, forming an electrical compartment 7. The chamber enclosed by the two corrugated plates of each set of inner baffles 6 forms an insulating compartment 8. Finally, the bottom of the signal post 9 is fixed to the lower crossbeam of the mounting bracket 11, so that the signal post 9 is placed vertically inside the insulating compartment 8, and the outer wall of the post body is in close contact with the concave surface of the two inner baffles 6 in the same group, completing the overall structural assembly. When the cable branch box is energized, the electric field between the adjacent two phase terminal blocks 4 needs to pass through the air medium of one side electrical compartment 7, the insulating material of the inner baffle 6, the air medium of the insulating compartment 8, the insulating material of the other side inner baffle 6, and the air medium of the other side electrical compartment 7 in sequence, forming an insulation path with multiple insulating media connected in series. If overvoltage or moisture occurs in the electrical compartment 7, creepage current will be generated along the surface of the baffle. The current needs to repeatedly bend along the concave and convex contour of the corrugated plate. At the same time, the hydrophobic insulating coating on the surface of the outer baffle 5 and the inner baffle 6 can prevent condensation on the plate surface to form a continuous water film, increase the resistance to the development of creepage current, and limit the arc from spreading to the adjacent phase along the surface of the baffle. During operation, when the terminal block 4 is subjected to installation stress, cabinet vibration, or short-circuit electrodynamic force, the baffle crest structure on both sides of the electrical compartment 7 will block the displacement path of the terminal block 4 from the side. The contact between the crest end face and the side of the terminal block 4 will constrain its lateral movement and maintain the fixed position of each phase terminal block 4. When the inner baffle 6 is subjected to the force from the side of the electrical compartment 7 and tends to bend or shake towards the insulating compartment 8, the signal column 9 fixed on the mounting bracket 11 will apply a reverse support force to the inner baffle 6 through the abutment structure between the column body and the concave surface of the inner baffle 6, which will counteract the deformation load, limit the bending amplitude and shaking displacement of the inner baffle 6, and maintain the stability of the baffle structure.During the heat dissipation process, the heat generated by the power-on terminal block 4 is dissipated into the electrical compartment 7, and is restricted by the surrounding baffles to prevent lateral diffusion within the independent chamber. After absorbing heat, the air density in the compartment decreases, and it flows upward along the vertical chamber channel. It is discharged from the box 1 through the ventilation opening corresponding to the compartment at the upper crossbeam of the mounting bracket 11. Simultaneously, the low-temperature air from outside is replenished into the compartment from the corresponding ventilation opening at the lower crossbeam, forming a natural convection circulation from bottom to top in each independent compartment, continuously discharging the heat generated by the terminal block 4 into the box 1.

[0049] In summary, this cable branch box with a dual-compartment structure forms three electrical compartments 7 and two insulating compartments 8 by setting two outer baffles 5 and two sets of inner baffles 6. The insulating compartments 8 not only enhance the insulation between adjacent two-phase terminal blocks 4 through a combination of solid insulation and air gaps, but also house the signal posts 9 used for monitoring electrical conditions, thus protecting the signal posts 9 from the electrical influence of the insulating compartments 8.

[0050] This cable branch box with a dual-compartment structure, by setting the inner baffle 6 as a corrugated plate, can not only use the corrugated protrusions to form an edge limiting mechanism for the terminal block 4, but also use the space between the symmetrical corrugated plates to accommodate the signal post 9. At the same time, the concave and convex structure of the corrugated plate increases the surface creepage distance in a limited space, which is more effective than the flat plate form in suppressing surface creepage and the spread of electric arc between adjacent phases.

[0051] The cable branch box with a dual-compartment structure provides reliable limiting support for the inner baffle 6 by abutting the signal post 9 against the concave surface of the corrugated plate. This effectively constrains the deformation and swaying of the corrugated plate caused by vibration or electrodynamic force, thereby ensuring the stable limiting effect on the terminal block 4.

[0052] This cable branch box with a dual-compartment structure has three electrical compartments 7 and two insulation compartments 8. The three independent electrical compartments 7 physically isolate the heat generated by each phase terminal block 4, avoiding the lateral superposition and mutual interference of heat. Each compartment forms an independent microenvironment, and its specific airflow channels, such as possible vents above and below the compartment or natural convection paths, can more effectively remove the heat generated by a single phase from the box body 1 through the chimney effect.

[0053] Example 2: This embodiment provides a cable branch box with a dual-compartment structure, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0054] Please see Figures 5-7Because conventional detection methods are easily affected by insulating plates or electric arcs, in this embodiment, three signal posts 9 are staggered within two insulating compartments 8. Each of the three signal posts 9 is equipped with a temperature probe 91, and the three temperature probes 91 pass through the inner baffle 6 and are exposed in different electrical compartments 7. The three signal posts 9 also contain: The controller has a built-in wireless communication module for sending temperature data to a remote monitoring terminal. Alarm device, including an audible and visual alarm installed on top of signal post 9; The low-voltage power supply module is installed on the mounting bracket 11 or the enclosure 1 of the cable branch box and is used to power the controller. The signal column 9 has a hollow structure with a wire channel inside. The temperature probe 91 is electrically connected to the controller through a wire passing through the wire channel.

[0055] Furthermore, the inner baffle 6 has a through-hole for the temperature probe 91 at the corresponding installation position. The temperature probe 91 passes through the corresponding installation hole. An insulating sealing sleeve is provided between the outer wall of the temperature probe 91 and the inner wall of the installation hole. The two ends of the insulating sealing sleeve are flush with the two side panels of the inner baffle 6. Its function is to ensure the structural integrity and compartment sealing of the inner baffle 6, prevent airflow or arcing between the electrical compartment 7 and the insulating compartment 8 through the installation hole, and at the same time provide insulation and radial limit for the temperature probe 91 to prevent probe displacement from affecting the temperature detection accuracy and maintain the stability of interphase insulation performance.

[0056] Furthermore, the three signal pillars 9 are arranged in a staggered manner, with two signal pillars 9 in the front insulating compartment 8, corresponding to the frontmost and middle electrical compartments 7 respectively, and one signal pillar 9 in the rear insulating compartment 8, corresponding to the rearmost electrical compartment 7. The central axes of the three signal pillars 9 are not on the same transverse section. This is to create a staggered layout of the audible and visual alarms at the top of the three signal pillars 9 in the longitudinal direction, avoiding mutual obstruction of the alarm devices of the front and rear signal pillars 9. At the same time, it ensures that the penetration positions of the three temperature probes 91 are not on the same transverse straight line, lengthening the air insulation path between adjacent probes and reducing the risk of phase-to-phase electrical breakdown.

[0057] Furthermore, the detection end of the temperature probe 91 extends into the electrical compartment 7, with the detection end facing the heating area of ​​the main body of the terminal block 4 within the electrical compartment 7. The detection end maintains a set non-contact detection distance from the surface of the terminal block 4. The terminal of the temperature probe 91 is completely contained within the hollow wire channel of the signal post 9. Its function is to ensure that the temperature probe 91 can accurately collect the radiation temperature data of the terminal block 4, while avoiding the insulation risk caused by direct contact between the probe and the live terminal block 4. The terminal is confined inside the signal post 9 on the side of the insulating compartment 8, isolating the electromagnetic interference of the high-voltage electric field of the electrical compartment 7 on the detection circuit.

[0058] Furthermore, the inner wall of the hollow wire channel of the signal column 9 is covered with a full circle of insulating lining. The connecting wires of the temperature probe 91 and the connecting wires of the controller and the alarm device are all laid inside the wire channel. All wires are covered with flame-retardant insulating sleeves. The purpose of these sleeves is to improve the insulation protection level inside the signal column 9, avoid signal interference or short circuit faults between different functional wires, and enhance the flame-retardant protection capability of the wires, thereby ensuring the operational reliability of the detection and alarm circuit.

[0059] Furthermore, the audible and visual alarms are fixedly installed on the top end face of the signal column 9. The top of all the audible and visual alarms protrudes above the upper crossbeam of the mounting bracket 11 and corresponds one-to-one with the position of the transparent observation window on the box 1. Each audible and visual alarm has a corresponding phase identification structure on its side. Its function is to allow the operator to directly observe the operating status of the audible and visual alarms through the observation window of the box without opening the box door. With the phase identification and staggered layout, the faulty phase can be quickly located, improving the convenience of fault diagnosis and the safety of operation.

[0060] Furthermore, the low-voltage power supply module is fixed to the lower side of the mounting bracket 11. The output power supply wires of the low-voltage power supply module are laid along the insulated wiring groove on the side of the mounting bracket 11 and connected to the controller power supply terminals inside the three signal posts 9 respectively. All power supply wires do not pass through any electrical compartment 7. The purpose of this is to avoid electromagnetic interference from the strong electric field of the main circuit to the low-voltage power supply circuit, ensure the power supply stability of the controller and alarm device, and at the same time not damage the independent separation structure of each electrical compartment 7, and not affect the original insulation and heat dissipation performance of the compartment.

[0061] Working principle: During the assembly stage, after completing the installation of the baffle structure, compartment structure, and signal post 9 foundation as described in Example 1, the three signal posts 9 are fixed to the lower crossbeams of the mounting brackets 11 corresponding to the two insulating compartments 8 according to the staggered arrangement plan. Two signal posts 9 are installed in the front insulating compartment 8, corresponding to the front and rear electrical compartments 7 respectively, and one signal post 9 is installed in the rear insulating compartment 8, corresponding to the middle electrical compartment 7. The positions are adjusted so that the central axes of the three signal posts 9 are not on the same transverse section. Subsequently, through probe mounting holes are opened at the corresponding positions of each inner baffle 6. The temperature probe 91 of each signal post 9 is inserted into the corresponding electrical compartment 7 through the probe mounting hole. An insulating sealing sleeve is filled in the gap between the probe and the mounting hole to complete the sealing and fixation. The probe posture is adjusted so that the detection end faces the main heating area of ​​the wiring board 4, and the set non-contact detection distance is maintained. After the probe installation is completed, the connecting wire of the temperature probe 91 is laid along the hollow wire channel inside the signal column 9 and connected to the controller input terminal inside the signal column 9. Simultaneously, the audible and visual alarm is installed at the top of the signal column 9 and connected to the controller output terminal via the connecting wire in the wire channel. Finally, the low-voltage power supply module is fixed to the lower side of the mounting bracket 11, and the power supply wire is laid along the insulated wiring groove on the side of the mounting bracket 11, connecting to the controller power supply terminals inside the three signal columns 9 respectively, completing the assembly and wiring of the entire detection and alarm circuit. During operation, when the cable branch box is normally energized, the low-voltage power supply module continuously provides a stable low-voltage power supply to the controllers and audible and visual alarms inside each signal column 9. Each temperature probe 91 collects the temperature signal of the terminal block 4 in the corresponding electrical compartment 7 in real time, and transmits the signal to the corresponding controller through the connecting wire in the wire channel. The controller analyzes and processes the received temperature data. On the one hand, it remotely transmits the real-time temperature data to the background monitoring terminal through the built-in wireless communication module to realize remote online temperature monitoring. On the other hand, it compares the real-time temperature value with the preset alarm threshold. When the temperature of a certain phase terminal block 4 exceeds the threshold, the audible and visual alarm at the top of the corresponding signal column 9 is triggered. During operation, the three signal columns 9 are staggered in the two insulating compartments 8 in the front-to-back direction, so that the three audible and visual alarms form a staggered layout in the depth direction. When the operator observes through the box observation window or opens the box door, the front signal column 9 will not block the alarm device behind. The operator can directly match the faulty electrical compartment 7 and phase according to the spatial position and phase identification of the alarm device. At the same time, the staggered temperature probes 91 are not on the same horizontal cross section, and the air insulation path between adjacent temperature probes 91 is longer, which can reduce the probability of phase-to-phase electrical breakdown between probes under overvoltage conditions. The core control components of the entire detection circuit are all located in the signal column 9 inside the insulating compartment 8. Only the detection end of the temperature probe 91 extends into the electrical compartment 7. The high-voltage electric field and electric arc inside the electrical compartment 7 are isolated by the physical separation of the inner baffle 6, so as to avoid interference and damage to the detection circuit by the energized environment and ensure the stable operation of the system.

[0062] In summary, this cable branch box with a dual-compartment structure features signal posts 9 staggered within two insulating compartments 8, with alarm devices such as indicator lights of different colors spatially distributed. When a fault occurs in an electrical compartment 7, its corresponding alarm device will illuminate. Operators can easily and accurately locate the faulty phase by observing the spatial position of the alarm devices through the observation window or by opening the box door; for example, a lit signal post 9 on the left corresponds to phase A, a lit signal post 9 in the middle corresponds to phase B, and a lit signal post 9 on the right corresponds to phase C. This eliminates the need for individual measurements. Furthermore, the staggered design prevents the operator's view from being obstructed by the signal posts 9, improving the ease of observation.

[0063] This cable branch box with a dual-compartment structure has temperature probes 91 installed on staggered signal posts 9. The temperature probes 91 are connected to different electrical compartments 7. On the one hand, the staggered signal posts 9 can prevent the temperature probes 91 from being on the same straight line, reducing the possibility of electrical breakdown. On the other hand, the staggered signal posts 9 can make it easier for operators to observe the indication position of the alarm device.

[0064] Example 3: This embodiment provides a cable branch box with a dual-compartment structure, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0065] Even after improvements based on the above embodiments, the cable branch box still has the following drawbacks: First, the creepage resistance is only in a single horizontal dimension, and the baffle has no vertical obstruction structure. Second, the corrugated plate can only provide lateral constraint on the terminal block 4, lacking vertical limiting structures. Third, adding limiting components and arc-damping components separately would occupy the limited space of the electrical compartment 7.

[0066] Please see Figures 8-9 The inner baffle 6 is a corrugated insulating plate. On its convex surface facing the electrical compartment 7, multiple arc-blocking ridges 61 are evenly arranged vertically. The arc-blocking ridges 61 are arranged perpendicular to the wave direction of the corrugated plate. Among the arc-blocking protrusions 61 on each side of the convex surface, the two arc-blocking protrusions 61 near the upper and lower edges of the terminal block 4 are limiting protrusions 611. The inner end face of the arc-blocking protrusion 61 is attached to the upper and lower sides of the corresponding terminal block 4. The remaining arc-blocking protrusions 61 are distributed vertically at equal intervals between the two limiting protrusions 611.

[0067] Furthermore, the arc-blocking convex 61 and the inner baffle 6 are integrally formed insulated structures.

[0068] Furthermore, the cross-section of the arc-blocking convex 61 is a trapezoid with a wide root and a narrow end, and the edges are all rounded to prevent dust and water from accumulating on the upper and lower surfaces, and also to cause the heat dissipation airflow to converge towards the middle.

[0069] Furthermore, the end face of the limiting protrusion 611 that is in contact with the terminal block 4 is provided with an insulating buffer layer to accommodate the thickness tolerance of the terminal block 4 and prevent hard contact from scratching the surface insulation layer of the terminal block 4.

[0070] Working principle: During the assembly stage, the arc-blocking ridges 61 and the corrugated inner baffle 6 are integrally pressed and molded from flame-retardant insulating material. Multiple trapezoidal arc-blocking ridges 61, with a cross-section wider at the root and narrower at the ends, are evenly distributed vertically on the convex surface of the inner baffle 6 facing the electrical compartment 7. All ridge edges are rounded. Two of the arc-blocking ridges 61 closest to the upper and lower ends of the inner baffle 6 are limiting ridges 611, with an insulating buffer layer pre-applied to their contact surfaces. When installing the inner baffle 6, the vertical position of the baffle is adjusted so that the inner end faces of the two limiting ridges 611 are respectively attached to the upper and lower sides of the corresponding terminal block 4. The remaining arc-blocking ridges 61 are equidistantly distributed vertically on the upper and lower sides of the terminal block 4, completing the positioning and fixing of the inner baffle 6 and ensuring that the direction of the arc-blocking ridges 61 is perpendicular to the corrugated direction of the corrugated plate. During the operation of the cable branch box under power, when creepage current or arc propagation occurs along the surface of the inner baffle 6 in the electrical compartment 7, the leakage current and arc must simultaneously bend multiple times along the transverse concave-convex contour of the corrugated plate and bypass multiple vertically arranged arc-blocking ridges 61, forming a composite surface path with both transverse and vertical bidirectional bending. The multi-level vertical ridges can cut the continuously propagating arc into multiple short arcs, lengthening the arc's development path. Combined with the rounded transition edges of the trapezoidal cross-section of the ridges, local electric field concentration is avoided, the arc is cooled and extinguished more quickly, and the vertical cross-phase propagation of the arc is suppressed. At the same time, the trapezoidal cross-section of the ridges is narrow at the top and wide at the bottom, with no horizontal dust accumulation surface, which can reduce the accumulation of dust and condensation on the ridge surface and prevent the baffle surface insulation performance from being reduced due to the accumulation of contaminants. During the limiting function, when the terminal block 4 experiences displacement due to cabinet vibration, short-circuit electrodynamics, installation stress, or thermal expansion and contraction, the lateral displacement is blocked and constrained by the crest end face of the corrugated plate, and the vertical displacement is blocked and constrained by the mating end faces of the two limiting protrusions 611, forming a full-plane limiting system that fixes the spatial position of the terminal block 4. The insulating buffer layer on the end face of the limiting protrusions 611 can adapt to the thickness tolerance of the terminal block 4, absorbing vibration impact and preventing hard contact from scratching the insulating layer on the surface of the terminal block 4. After the position of the terminal block 4 is accurately fixed, the detection distance between the temperature probe 91 extending into the electrical compartment 7 and the terminal block 4 remains constant, eliminating the temperature measurement deviation caused by the displacement of the terminal block 4 and ensuring the accuracy of the temperature detection data. During the structural support and heat dissipation process, the vertically arranged arc-damping convex ribs 61 are integrally formed with the inner baffle 6, which is equivalent to adding multiple vertical reinforcing ribs to the convex surface of the inner baffle 6. This improves the overall bending stiffness of the inner baffle 6, reduces the bending deformation amplitude caused by electrodynamic force and vibration load on the baffle, and, together with the signal column 9 in the insulating compartment 8, provides abutment support to the concave surface of the inner baffle 6. This further constrains the deformation and sway of the inner baffle 6, maintains the structural stability of the inner baffle 6, and ensures the continuous effectiveness of the compartment separation and limiting functions.Meanwhile, the trapezoidal cross-section of the arc-damping protrusion 61 forms a sloping structure on both sides. When the heat dissipation airflow flowing from bottom to top in the electrical compartment 7 passes through the protrusion, the sloping surface will guide the airflow to converge towards the heat-generating area of ​​the middle terminal block 4, thereby enhancing the convective heat transfer effect between the airflow and the surface of the terminal block 4 and improving the heat dissipation efficiency of the electrical compartment 7.

[0071] In summary, this cable branch box with a dual-compartment structure, by setting up an arc-blocking protrusion 61, achieves two-dimensional composite arc-blocking by forming a multi-level, stepped creepage path on the convex surface, combined with the vertical wave-shaped structure of the inner baffle 6. On the other hand, the arc-blocking protrusion 61 forms a bidirectional limiting constraint, stabilizing the compartment structure and detection accuracy. Finally, the arc-blocking protrusion 61 can also improve the strength of the baffle structure and optimize the support stability.

[0072] First, it achieves two-dimensional composite creepage reduction and arc suppression, enhancing the interphase insulation protection performance. The arc-suppressing ridge 61 orthogonally cooperates with the transverse wave structure of the corrugated plate itself, forming a multi-directional bending composite surface path on the baffle surface, significantly increasing the interphase creepage distance. The multi-level vertical ridges can cut the continuous arc spreading along the surface into multiple short arcs, lengthening the arc development path and accelerating cooling and extinguishing, effectively suppressing the vertical spread of the arc between phases. Together with the electrical compartment 7 and the insulation compartment 8 structure of the first invention point, it forms a double-layer protection, further improving the interphase insulation reliability.

[0073] Secondly, a two-way limiting constraint is formed to stabilize the compartment structure and detection accuracy. The upper and lower limiting protrusions 611 fit against the edge of the terminal block 4, cooperating with the lateral limiting of the corrugated plate crest to form a full-plane limiting system, completely constraining the movement of the terminal block 4 and preventing the reduction of the interphase insulation distance caused by external force displacement of the terminal block 4, thus consolidating the structural stability of each electrical compartment 7 in the first invention point. Simultaneously, the precise fixing of the terminal block 4 position ensures that the detection distance between the temperature probe 91 and the terminal block 4 in the second invention point remains constant, eliminating temperature measurement errors caused by positional displacement, improving the accuracy of temperature detection and fault alarm, and achieving a synergistic gain between the mechanical structure and the detection function.

[0074] Third, the strength of the baffle structure is improved simultaneously, and the support stability is optimized. The vertically arranged arc-damping ribs 61 are equivalent to the reinforcing ribs of the corrugated plate, which can improve the overall deformation stiffness of the corrugated plate and reduce the bending deformation of the baffle caused by electrodynamics and vibration. Together with the signal post 9 in the insulating compartment 8, the limiting reliability of the inner baffle 6 to the terminal block 4 is further enhanced. The overall structural stability can be improved without the need for additional reinforcing structures, taking into account both space utilization and structural performance.

[0075] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0076] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A cable branch box with a double-compartment structure, comprising a box body (1) and a mounting bracket (11) disposed within the box body (1), wherein a main incoming circuit breaker (2) and multiple branch circuit breakers (3) are disposed on the mounting bracket (11), the branch circuit breakers (3) are horizontally spaced on the same mounting bracket (11), the main incoming circuit breaker (2) is disposed on the mounting bracket (11) above the branch circuit breakers (3), the three-phase outgoing lines of the main incoming circuit breaker (2) are respectively connected to three terminal blocks (4) spaced apart front and rear, and the three-phase incoming lines of the branch circuit breakers (3) are respectively connected to the terminal blocks (4) of the corresponding phase, characterized in that, The cable branch box is also equipped with: Two outer baffles (5) are respectively set on the front side of the frontmost wiring plate (4) and the rear side of the rearmost wiring plate (4); Two sets of inner baffles (6) are respectively set between adjacent wiring boards (4). Each set of inner baffles (6) includes two symmetrically arranged inner baffles (6), and the inner baffles (6) are corrugated plates. Five compartments, including three electrical compartments (7) and two insulating compartments (8), with three-phase terminal blocks (4) located in different electrical compartments (7) formed between inner baffles (6) and outer baffles (5), and insulating compartments (8) formed between two inner baffles (6) in a set of inner baffles (6). At least three signal posts (9) are set in two insulating compartments (8). The outer wall of the signal post (9) abuts against the concave surface of the inner baffle (6) to detect the temperature of the terminal block (4) and trigger an alarm.

2. A cable branch box with a dual-compartment structure according to claim 1, characterized in that, The cable branch box is equipped with three signal posts (9), which are staggered in two insulating compartments (8). Each of the three signal posts (9) is equipped with a temperature probe (91). The three temperature probes (91) pass through the inner baffle (6) and are exposed in different electrical compartments (7). The three signal posts (9) are also equipped with: The controller has a built-in wireless communication module for sending temperature data to a remote monitoring terminal. Alarm device, including an audible and visual alarm installed on top of the signal post (9); A low-voltage power supply module is installed on the mounting bracket (11) or the enclosure (1) of the cable branch box for powering the controller; The signal column (9) has a hollow structure and a wire channel inside. The temperature probe (91) is electrically connected to the controller through a wire passing through the wire channel.

3. A cable branch box with a dual-compartment structure according to claim 1, characterized in that, The inner baffle (6) is a corrugated insulating plate. On its convex surface facing the electrical compartment (7), multiple arc-blocking ridges (61) are uniformly arranged vertically. The arc-blocking ridges (61) are arranged perpendicular to the wave direction of the corrugated plate. Among the arc-blocking protrusions (61) on each side of the convex surface, the two arc-blocking protrusions (61) near the upper and lower edges of the terminal block (4) are limiting protrusions (611). The inner end face of the arc-blocking protrusion (61) is attached to the upper and lower sides of the corresponding terminal block (4), and the remaining arc-blocking protrusions (61) are distributed vertically at equal intervals between the two limiting protrusions (611).

4. A cable branch box with a dual-compartment structure according to claim 1, characterized in that, The two outer baffles (5) and the two sets of inner baffles (6) are all vertically fixed to the two side plates of the mounting bracket (11) by insulating fasteners.

5. A cable branch box with a dual-compartment structure according to claim 1, characterized in that, The inner baffle (6) is a wave plate with a continuous arc transition sinusoidal waveform structure. The position of the wave crest on the side facing the electrical compartment (7) corresponds to the side profile of the wiring board (4). The end face of the wave crest abuts against the side of the wiring board (4) or leaves a gap.

6. A cable branch box with a dual-compartment structure according to claim 1, characterized in that, Both the outer baffle (5) and the inner baffle (6) are made of transparent insulating material.

7. A cable branch box with a dual-compartment structure according to claim 2, characterized in that, The inner baffle (6) has a through-type probe mounting hole at the installation position of the temperature probe (91). The temperature probe (91) is inserted into the corresponding probe mounting hole. An insulating sealing sleeve is provided between the outer wall of the temperature probe (91) and the inner wall of the probe mounting hole. The two ends of the insulating sealing sleeve are flush with the two sides of the inner baffle (6).

8. A cable branch box with a dual-compartment structure according to claim 2, characterized in that, The three signal columns (9) are arranged in a staggered manner with the front and back staggered. Two signal columns (9) are set in the front insulating compartment (8), corresponding to the frontmost and middle electrical compartments (7) respectively. One signal column (9) is set in the rear insulating compartment (8), corresponding to the last electrical compartment (7). The central axes of the three signal columns (9) are not on the same transverse section.

9. A cable branch box with a double-compartment structure according to claim 3, characterized in that, The arc-damping protrusion (61) and the inner baffle (6) are an integral insulating molded structure.

10. A cable branch box with a dual-compartment structure according to claim 3, characterized in that, The cross-section of the arc-blocking protrusion (61) is a trapezoid with a wide root and a narrow end, and the edges of the arc-blocking protrusion (61) are all rounded.

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