Outdoor intelligent high-voltage cable branch box

Abstract

The application discloses an outdoor intelligent high-voltage cable branch box and relates to the technical field of cable boxes. The following scheme is provided: the branch box assembly comprises a fixed box body and a side-opening upturned cover hinged to the side of the fixed box body, and further comprises a dehumidification module, the dehumidification module comprises a sealed shell fixed to the inner wall of the fixed box body, the sealed shell is provided with an air inlet and an air outlet, the air inlet is communicated with the inside of the fixed box body, an inner circulation axial flow fan is arranged at the air outlet, a caterpillar belt type water absorption body assembly capable of circulating and rolling is arranged in the sealed shell and is used for absorbing water in the air, a squeezing dehydration roller is further arranged in the sealed shell and is used for squeezing the caterpillar belt type water absorption body assembly to remove the absorbed water. Water is removed in liquid state through mechanical squeezing, is guided to a discharge port through a liquid collecting guide pipe and is discharged out of the box, and one-way removal of water in liquid state in the box is realized.

Description

Technical Field

[0001] This invention relates to the field of cable box technology, and more particularly to an outdoor intelligent high-voltage cable branch box. Background Technology

[0002] High-voltage cable branch boxes are key node equipment in urban and rural power distribution networks to realize T-connection, branching and load distribution of trunk cables. Due to long-term exposure to outdoor environments such as sun and rain, significant temperature differences between day and night and seasonal high humidity, condensation is easily generated in the sealed space inside the box. This is a long-standing technical problem that has plagued power operation and maintenance departments for many years. Cable distribution boxes face a set of inherent structural contradictions during operation: on the one hand, the three-phase high-voltage terminals and cable joints inside the box will generate continuous Joule heat under normal load current, especially in urban center areas with high load density and large cable current carrying capacity, the internal temperature rise of the box is significant, and proper ventilation and heat dissipation are needed to avoid accelerated aging of insulation materials; on the other hand, outdoor air often carries a large amount of water vapor. If outside air is directly introduced for heat dissipation, the high humidity air will condense when it enters the box and cools down, which will exacerbate the risk of condensation. Summary of the Invention

[0003] In view of this, the purpose of this invention is to provide an outdoor intelligent high-voltage cable branch box to solve the above problems.

[0004] To achieve the above technical objectives, the present invention provides an outdoor intelligent high-voltage cable branch box: It includes a branch box assembly, which includes a fixed box body and a side-opening flip-up cover hinged to the side of the fixed box body. It also includes a dehumidification module, which includes a sealed shell fixed to the inner wall of the fixed box body. The sealed shell body has an air inlet and an air outlet. The air inlet communicates with the interior of the fixed box body. An internal circulation axial flow fan is provided at the air outlet. The sealed shell body has a recirculating and rolling track-type water absorption assembly for absorbing moisture from the air. The sealed shell body also has a squeezing dehydration roller for squeezing the track-type water absorption assembly to remove the absorbed moisture. The bottom of the sealed shell is equipped with a liquid collection and diversion pipe, through which the squeezed-out liquid water is discharged from the fixed box.

[0005] Preferably, the tracked absorbent assembly includes an annular guide sealing frame, a highly absorbent sponge, and a breathable air-permeable coating layer covering the surface of the highly absorbent sponge, wherein the surface of the breathable air-permeable coating layer has micropores for air to pass through.

[0006] Preferably, the breathable air-permeable coating layer has two layers, an inner and an outer layer, which respectively cover the inner and outer surfaces of the superabsorbent sponge. A closed annular cavity is formed between the two coating layers to accommodate the superabsorbent sponge. The two annular guide sealing frames are respectively fixed to the upper and lower sides of the two breathable air-permeable coating layers.

[0007] Preferably, the inner wall of the sealed housing is fixed with a housing fixing bracket, the annular guide sealing frame is slidably sealed with the housing fixing bracket, and the opposite surfaces of the annular guide sealing frame and the housing fixing bracket are provided with a labyrinth-type sealing structure to prevent gas bypass leakage while allowing relative sliding.

[0008] Preferably, the annular guide sealing frame is provided with a driven transmission tooth block, and the dehumidification module further includes a stepping drive roller group, which drives the tracked water absorption assembly to roll step by step along the annular path through the driven transmission tooth block.

[0009] Preferably, the stepper drive roller assembly includes a reduction stepper motor and a drive roller shaft driven by the motor, wherein the drive roller shaft is provided with a synchronous driven gear that meshes with the driven transmission gear block.

[0010] Preferably, the extrusion dewatering roller is a rigid roller, rotatably connected inside the sealed housing, located on the rotation path of the tracked water suction assembly and abutting against the tracked water suction assembly.

[0011] Preferably, it also includes a temperature and humidity composite sensor and a dehumidification controller; The dehumidifier is electrically connected to the temperature and humidity composite sensor, the internal circulation axial flow fan, and the stepper drive roller assembly. The dehumidifier controls the start and stop of the internal circulation axial flow fan and the movement of the stepper drive roller assembly based on the humidity value inside the chamber monitored by the temperature and humidity composite sensor.

[0012] Preferably, the dehumidifier controller is configured as follows: The internal circulation axial flow fan will start when the humidity value is higher than the preset start threshold. If the rate of decrease in humidity is lower than the preset threshold after the internal circulation axial flow fan has been running for the first preset time, the stepping drive roller group will be activated to drive the crawler-type water suction assembly to roll in a stepping motion. When the humidity value is lower than the preset stop threshold, the internal circulation axial flow fan and the stepper drive roller assembly will be shut down.

[0013] As can be seen from the above technical solutions, this application has the following beneficial effects: By connecting the air inlet of the internal circulation axial flow fan to the inside of the fixed housing through the return air port of the sealed shell, and sending the air outlet back to the inside of the fixed housing through the air supply port, the air inside the housing forms a completely closed self-circulating loop. Unlike traditional external exhaust dehumidification devices, this method prevents high-humidity air from directly entering the housing from the source. When the circulating fan forces the air inside the housing to flow through the tracked water absorption assembly, the moisture is absorbed by the highly absorbent sponge. Then, the stepping drive roller group drives the sponge to roll to the squeezing dehydration roller, where the moisture is mechanically squeezed out in liquid form and guided to the discharge port through the liquid collection guide pipe to be discharged outside the housing. This achieves one-way removal of moisture from the housing in liquid form. Attached Figure Description

[0014] 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 embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0015] Figure 1 This invention provides an overall structural schematic diagram of an outdoor intelligent high-voltage cable branch box; Figure 2 A schematic diagram of the open state of the side-opening flip-up cover of an outdoor intelligent high-voltage cable branch box provided by the present invention; Figure 3 A schematic diagram of the overall structure of the dehumidification module of an outdoor intelligent high-voltage cable branch box provided by the present invention; Figure 4 This invention provides a partial cross-sectional view of the dehumidification module of an outdoor intelligent high-voltage cable branch box. Figure 5 A schematic diagram of the overall structure of a highly absorbent sponge and a breathable gas-permeable coating layer for an outdoor intelligent high-voltage cable branch box provided by the present invention; Figure 6 A schematic diagram of the overall structure of the housing fixing bracket of an outdoor intelligent high-voltage cable branch box provided by the present invention; Figure 7 A schematic diagram of the overall structure of the stepper drive roller group of an outdoor intelligent high-voltage cable branch box provided by the present invention; Figure 8 This invention provides a schematic diagram of the overall structure of an outdoor intelligent high-voltage cable branch box, including an annular guide sealing frame, a highly absorbent sponge, and a breathable gas-permeable coating layer. Attached image description: 10. Branch box assembly; 11. Fixed enclosure; 12. Side-opening flip-up cover; 13. Three-phase high-voltage terminals; 20. Dehumidification module; 21. Sealed housing; 211. Liquid collection guide pipe; 22. Internal circulation axial flow fan; 23. Tracked water-absorbing body assembly; 231. Annular guide sealing frame; 2311. Labyrinth-type sealing ribs; 2312. Driven transmission gear block; 232. Highly absorbent sponge; 233. Breathable air-permeable coating layer; 234. Housing fixing bracket; 2341. Guide limiting convex rail; 235. Lateral floating sealing strip; 24. Stepper drive roller assembly; 241. Geared stepper motor; 242. Drive roller shaft; 2421. Synchronous driven gear; 2422. Synchronous pulley; 243. Synchronous transmission chain; 25. Extrusion dewatering roller. Detailed Implementation

[0017] The following description is exemplary in nature and is not intended to limit the scope, application, or use of this disclosure. It should be understood that in all these figures, the same or similar reference numerals indicate the same or similar parts and features. The figures are merely schematic representations of the concept and principles of embodiments of this disclosure and do not necessarily show the specific dimensions and scale of the various embodiments of this disclosure. Certain details or structures of embodiments of this disclosure may be exaggerated in particular portions of certain figures.

[0018] Example 1, see Figures 1-8 As shown, an outdoor intelligent high-voltage cable branch box includes a branch box assembly 10, which consists of a fixed box body 11, a side-opening flip-up cover 12 hinged to the side of the fixed box body 11, and three-phase high-voltage terminals 13 fixed inside the fixed box body 11. The interior of the fixed enclosure 11 is hollow and serves as a high-voltage live compartment. An insulating mounting bracket is fixed inside, which is used to fix the three-phase high-voltage terminals 13, cable fixing clamps, and grounding copper busbars, etc. The side-opening flip-up cover 12 is wedged into the fixed enclosure 11 with a waterproof sealing strip, forming a reliable waterproof seal when closed. When maintenance or wiring is required, the maintenance personnel open the bottom lock and use the hydraulic support rod to lift the side-opening flip-up cover upwards. The operator can directly face the terminals to make and crimp the cable terminals. The operating space is spacious and the convenience is far superior to the traditional front-opening branch box.

[0019] The bottom of the fixed box 11 is fixed to a pre-constructed concrete base by anchor bolts. The base is raised a certain distance above the ground to prevent water from flowing back into the ground. The cable is inserted through the bottom of the fixed box, stripped and crimped to the corresponding terminal of the three-phase high-voltage terminal 13.

[0020] The top of the fixed enclosure 11 is equipped with a heat-insulating and rainproof awning. When the side-opening flip-up cover 12 is closed, a certain thickness of air gap is maintained between the top plate of the cover and the heat-insulating awning. This gap only serves as a buffer cavity to block solar heat radiation and does not participate in any gas exchange between the inside and outside of the enclosure, so as to avoid the direct intrusion of high-humidity air from the outside into the enclosure.

[0021] It also includes a dehumidification module 20, which includes a sealed housing 21, which is fixed to the inner wall of the fixed box 11 by bolts; one end of the sealed housing 21 is provided with a return air port; the other end of the sealed housing 21 is an air supply port, and an internal circulation axial flow fan 22 is fixedly installed at this end. When the fan is running, it draws the high humidity air at the bottom into the sealed housing, and the dry air after dehumidification is discharged from the air supply port to the upper space inside the box. In this embodiment, at least two dehumidification modules 20 are provided, symmetrically distributed on the left and right side walls of the fixed box 11, so as to form a three-dimensional circulating airflow field from bottom to top and from left to right inside the box, effectively eliminating dehumidification dead corners.

[0022] Specifically, the sealed shell 21 is equipped with a tracked water-absorbing body assembly 23, which is used to absorb water molecules in the air. The tracked water-absorbing body assembly 23 includes two oval-shaped annular guide sealing frames 231 made of flexible weather-resistant rubber. The opposite surfaces of the two annular guide sealing frames 231 are provided with concentric oval-shaped fitting grooves. A breathable air-permeable adhesive coating layer 233 is provided between the two annular guide sealing frames 231. The breathable air-permeable adhesive coating layer 233 is made of rubber or synthetic leather material with microporous structure and uniformly opened breathable micropores on its surface, which can not only ensure smooth air passage, but also effectively trap fiber debris of the sponge. The breathable air-permeable coating layer 233 is divided into inner and outer layers. The two sides of the coating layer are respectively fitted and fixed in the oval fitting grooves of the upper and lower annular guide sealing frame 231, thereby forming a closed oval cavity between the two coating layers. The cavity is filled with highly absorbent sponge 232. The superabsorbent sponge 232 is a hydrophilic polyurethane foam material that ensures that it can quickly regain its water absorption capacity after being squeezed and dehydrated.

[0023] More specifically, in order to ensure that all the air entering the sealed housing 21 passes through the porous sponge and does not leak from the bypass, the annular guide sealing frame 231 has labyrinth-type sealing ribs 2311 fixed on the side of the sponge away from the sponge at both its inner and outer circumferences. The inner wall of the sealed shell 21 is fixed with a shell fixing bracket 234. The shell fixing bracket 234 and the opposite side of the annular guide sealing frame 231 are fixed with a guide limiting rail 2341 that cooperates with the labyrinth sealing rib 2311. The cross section of the labyrinth sealing rib 2311 is an inverted trapezoid, which slides with the trapezoidal groove on the guide limiting rail 2341. A small gap, such as 0.2-0.5mm, is maintained between the two. This gap allows the frame to roll smoothly along the fixed path, and the multi-stage labyrinth path extends the flow resistance of gas leakage, thereby achieving dynamic airtightness without friction jamming.

[0024] Lateral floating sealing strips 235 are also fixed on both sides of the housing fixing bracket 234. The sides of the annular guide sealing frame 231 and the breathable air-permeable coating layer 233 are all slidably sealed to the inner wall of the sealed housing 21 through the lateral floating sealing strips 235. The lateral floating sealing strips 235 are made of silicone rubber and have an internal air bladder structure. In the working state, they rely on their own elasticity to stick tightly to the side of the moving parts, which not only ensures the sealing performance, but also allows the tracked water absorption assembly to roll smoothly along the oval track.

[0025] Furthermore, driven transmission tooth blocks 2312 are uniformly fixed on the inner ring wall of the annular guide sealing frame 231. The dehumidification module 20 also includes a stepping drive roller group 24, which is used to drive the tracked water absorption assembly 23 to roll in a stepping motion along the oval track. The stepping drive roller group 24 includes a reduction stepping motor 241 and two active roller shafts 242. The output end of the reduction stepping motor 241 is fixedly connected to one of the active roller shafts 242 through a coupling. Synchronous pulleys 2422 are fixed on the two active roller shafts 242 respectively. The two synchronous pulleys 2422 are connected by a synchronous transmission chain 243 to realize the synchronous rotation of the two active roller shafts.

[0026] Both ends of the active roller 242 are connected to the side wall of the sealed housing 21 by bearing rotation and sealing. The active roller 242 is located in the inner center area of ​​the annular guide sealing frame 231. A synchronous driven gear 2421 is sleeved and fixed on the active roller 242. The synchronous driven gear 2421 meshes with the driven transmission gear block 2312 of the inner ring of the annular guide sealing frame 231. The active roller 242 is driven to rotate by the reduction stepper motor 241. The active roller 242 drives the synchronous driven gear 2421 to rotate. The synchronous driven gear 2421 then drives the annular guide sealing frame 231 to slowly roll along the oval track through the meshing of the gear block.

[0027] Specifically, the stepping angle and rotation cycle of the deceleration stepper motor 241 are controlled by the dehumidification controller. Each step can advance the tracked water absorption assembly forward, ensuring that each section of sponge can be periodically transported to the extrusion for dehydration and regeneration.

[0028] Furthermore, a liquid collection guide pipe 211 is fixed to the bottom of the sealed shell 21, and a discharge port is opened at the corresponding position on the side of the fixed box 11. The lower end of the liquid collection guide pipe 211 extends to the discharge port. Inside the sealed shell 21, a squeezing dehydration roller 25 is rotatably connected on the rotating path on the side of the breathable gas-permeable coating layer 233. The squeezing dehydration roller 25 is a metal roller with a polished outer surface, which abuts against the breathable gas-permeable coating layer 233. When the tracked water-absorbing body assembly 23 rolls, the water-saturated sponge part passes through the squeezing dehydration roller 25. The squeezing dehydration roller 25 squeezes the breathable gas-permeable coating layer 233 and the highly absorbent sponge 232 inside, mechanically squeezing out the water absorbed inside the sponge. The squeezed liquid water flows along the inner wall of the sealed shell 21 to the liquid collection guide pipe 211 at the bottom, and is finally discharged through the discharge port, keeping the inside of the box dry.

[0029] Example 2, based on Example 1, further includes a temperature and humidity composite sensor and a dehumidifier to achieve intelligent monitoring and automatic control; the dehumidifier is installed in a control box inside the fixed box 11, and multiple temperature and humidity composite sensors are provided, which are evenly distributed at different height positions inside the fixed box 11. The temperature and humidity composite sensor is used to monitor the temperature and relative humidity data inside the fixed box 11 in real time and transmit the signal to the dehumidifier. The dehumidifier has preset humidity start threshold, humidity stop threshold, and first preset time and slope threshold. The dehumidifier reads the values ​​of each temperature and humidity composite sensor at a fixed sampling period and takes the average value, and compares the average humidity value with the preset threshold. The humidity start threshold, humidity stop threshold, preset threshold, first preset time and slope threshold can be set by those skilled in the art according to actual needs, and no specific limitation is made here. When the average humidity value is detected to be higher than the preset start threshold, the dehumidifier first starts the internal circulation axial flow fan 22, which forces the air at the bottom of the box to be drawn into the sealed shell 21 through the return air pipe. When the air flows through the dry sponge area in the airflow channel of the tracked water absorption assembly 23, water molecules are adsorbed by the highly absorbent sponge 232. The dehumidified dry air is discharged back into the upper space inside the fixed box 11 through the air outlet, forming an internal circulation dehumidification.

[0030] If the internal circulation axial flow fan 22 continues to run for a first preset time, the dehumidifier calculates the descent rate based on real-time humidity data. If the descent rate is lower than the preset slope threshold, it is determined that the area currently participating in adsorption by the highly absorbent sponge 232 is approaching saturation and needs to be regenerated online. At this time, the dehumidifier further activates the deceleration stepper motor 241 to drive the tracked water absorption assembly 23 to roll along the oval track, moving the water-saturated sponge area out of the airflow channel and towards the squeezing dehydration roller 25 for squeezing dehydration. At the same time, the dried area that has been squeezed and regenerated is moved into the airflow channel to continue adsorption. This process continues until the humidity inside the chamber drops below the preset stop threshold. At this time, the dehumidifier shuts down the internal circulation axial flow fan 22 and the deceleration stepper motor 241, and the system enters a low-power standby state.

[0031] This segmented control strategy fully considers the differences in environmental humidity in different regions and seasons. Under slightly humid conditions with low absolute moisture content in the air, the dehumidification needs can be met by relying solely on forced circulation adsorption by the fan, without the need for frequent rolling of the conveyor belt, thus saving energy and reducing mechanical wear. Only when the sponge is saturated with adsorption and ventilation alone can no longer effectively dehumidify, is stepping rolling and compression regeneration initiated, achieving a balance between energy utilization efficiency and dehumidification effect.

[0032] The exemplary implementation of the solution proposed in this disclosure has been described in detail above with reference to preferred embodiments. However, those skilled in the art will understand that various modifications and alterations can be made to the above specific embodiments without departing from the spirit of this disclosure, and various combinations can be made to the various technical features and structures proposed in this disclosure without exceeding the protection scope of this disclosure, which is determined by the appended claims.

Claims

1. An outdoor intelligent high-voltage cable branch box, comprising a branch box assembly (10), the branch box assembly (10) comprising a fixed box body (11) and a side-opening flip-up cover (12) hinged to the side of the fixed box body (11), characterized in that, It also includes a dehumidification module (20), which includes a sealed shell (21) fixed to the inner wall of the fixed box (11). The sealed shell (21) is provided with an air inlet and an air outlet. The air inlet is connected to the inside of the fixed box (11). An internal circulation axial flow fan (22) is provided at the air outlet. The sealed shell (21) is provided with a recirculating and rolling track-type water absorption assembly (23) for absorbing moisture in the air. The sealed shell (21) is also provided with a squeezing dehydration roller (25) for squeezing the track-type water absorption assembly (23) to remove the absorbed moisture. The bottom of the sealed shell (21) is provided with a liquid collection guide pipe (211), and the liquid water squeezed out is discharged outside the fixed box (11) through the liquid collection guide pipe (211).

2. The outdoor intelligent high-voltage cable branch box according to claim 1, characterized in that, The tracked water-absorbing body assembly (23) includes an annular guide sealing frame (231), a highly absorbent sponge (232), and a breathable air-permeable coating layer (233) covering the surface of the highly absorbent sponge (232). The surface of the breathable air-permeable coating layer (233) has micropores for air to pass through.

3. The outdoor intelligent high-voltage cable branch box according to claim 2, characterized in that, The breathable air-permeable coating layer (233) has two layers, an inner and an outer layer, which respectively cover the inner and outer surfaces of the superabsorbent sponge (232). A closed annular cavity is formed between the two coating layers to accommodate the superabsorbent sponge (232). The two annular guide sealing frames (231) are respectively fixed to the upper and lower sides of the two breathable air-permeable coating layers (233).

4. An outdoor intelligent high-voltage cable branch box according to claim 2, characterized in that, The inner wall of the sealed housing (21) is fixed with a housing fixing bracket (234). The annular guide sealing frame (231) and the housing fixing bracket (234) are slidably sealed together. The opposite surfaces of the annular guide sealing frame (231) and the housing fixing bracket (234) are provided with a labyrinth-type sealing structure that cooperates with each other, so as to prevent gas bypass leakage while allowing relative sliding.

5. An outdoor intelligent high-voltage cable branch box according to claim 2, characterized in that, The annular guide sealing frame (231) is provided with a driven transmission tooth block (2312), and the dehumidification module (20) also includes a stepping drive roller group (24). The stepping drive roller group (24) drives the tracked water absorption body assembly (23) to roll along the annular path through the driven transmission tooth block (2312).

6. An outdoor intelligent high-voltage cable branch box according to claim 5, characterized in that, The stepper drive roller group (24) includes a reduction stepper motor (241) and an active roller shaft (242) driven by the motor. The active roller shaft (242) is provided with a synchronous driven gear (2421) that meshes with the driven transmission gear block (2312).

7. An outdoor intelligent high-voltage cable branch box according to claim 1, characterized in that, The extrusion dewatering roller (25) is a rigid roller, which is rotatably connected to the sealed housing (21), located on the rotation path of the tracked water suction assembly (23) and abutting against the tracked water suction assembly (23).

8. An outdoor intelligent high-voltage cable branch box according to claim 1, characterized in that, It also includes a temperature and humidity composite sensor and a dehumidification controller (40). The dehumidifier (40) is electrically connected to the temperature and humidity composite sensor, the internal circulation axial flow fan (22) and the stepper drive roller group (24). The dehumidifier (40) controls the start and stop of the internal circulation axial flow fan (22) and the operation of the stepper drive roller group (24) according to the humidity value inside the box monitored by the temperature and humidity composite sensor (30).

9. An outdoor intelligent high-voltage cable branch box according to claim 8, characterized in that, The dehumidifier (40) is configured to: When the humidity value is higher than the preset start-up threshold, the internal circulation axial flow fan (22) is started. If the rate of decrease in humidity value is lower than the preset threshold after the internal circulation axial flow fan (22) has been running for the first preset time, then the stepping drive roller group (24) is started to drive the crawler-type water suction assembly (23) to step and roll. When the humidity value is lower than the preset stop threshold, the internal circulation axial flow fan (22) and the stepper drive roller group (24) are turned off.

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