Cable trench with built-in dehumidification function and construction process and dehumidification method thereof

Abstract

The invention relates to the field of cable trench facilities, in particular to a cable trench with a built-in dehumidification function and a construction process and a dehumidification method of the cable trench. According to the invention, the S-shaped heating pipeline and the ventilating pipeline are pre-buried and are connected with the blowing device and the control system, and bottom heating evaporation and side wall air supply are combined to realize three-dimensional dehumidification, so that the internal humidity of the cable trench is remarkably reduced, and a dry and safe operation environment is provided for the cable. All functional pipelines and grounding grids are synchronously pre-buried in the civil engineering stage, strict plugging and fixing measures are adopted, the dehumidification function and the main body structure are integrally built, space is saved, and pre-burying precision and later implementation are guaranteed. Real-time humidity monitoring is carried out through the humidity sensor, dehumidification modes of different intensities are automatically started and stopped according to humidity values, intelligent and self-adaptive all-weather operation is achieved, the dehumidification efficiency is high, energy utilization is accurate, and the operation and maintenance cost and the manual operation intensity are greatly reduced.

Description

Technical Field

[0001] This invention relates to the field of cable trench facilities, and more specifically, to a cable trench with built-in dehumidification function, its construction process, and dehumidification method. Background Technology

[0002] Cable trenches, as an indispensable infrastructure in power systems, bear the important responsibility of centrally laying and protecting power cables. The stability of their operating environment directly affects the lifespan of the cables and the reliability of the power supply network. However, due to their underground location, cable trenches are highly susceptible to groundwater infiltration, surface water inflow, and condensation caused by diurnal temperature variations, resulting in a consistently high-humidity environment inside.

[0003] Currently, cable trenches are generally designed with water collection and drainage functions in mind, typically using a sump at the bottom and a pump for drainage. However, this method has significant limitations: the pump only operates when the water depth exceeds the minimum starting water level set by the pump, and it is ineffective at handling large amounts of moisture below the minimum water level in the sump and on the concrete walls and bottom of the trench. This moisture can only evaporate naturally, resulting in persistently high humidity inside the cable trench. This humid environment rapidly accelerates the corrosion of cable supports and severely degrades the performance of the cable sheath and insulation materials, posing a serious threat to the safe and stable operation of the power grid.

[0004] In addition, the main structure of cable trenches is usually made of ordinary concrete, which has a high thermal conductivity (1.0–2.7 W / (m·K)). This means that during seasonal changes or when there are large temperature differences between day and night, the concrete structure is more likely to cause water vapor in the air to condense on its surface, thus exacerbating the internal dampness.

[0005] To address such issues, existing technologies often employ remedial measures, such as installing dehumidifiers. However, these devices tend to occupy excessive space, have low dehumidification efficiency, and consume high energy. Furthermore, they are typically added after the cable trench is constructed, making it impossible to integrate them with the civil engineering structure or achieve uniform dehumidification, thus limiting their effectiveness.

[0006] Therefore, there is an urgent need for a technical solution that can start from the cable trench structure itself, deeply integrate with the construction process, and achieve proactive, efficient, and uniform moisture prevention and dehumidification. Summary of the Invention

[0007] The purpose of this invention is to address the problems existing in the prior art by providing a cable trench with built-in dehumidification function, along with its construction process and dehumidification method. It employs pre-embedded S-shaped heating pipes in the base plate and ventilation ducts in the side walls, connected to a blower and control system. Through a combination of bottom heating evaporation and forced airflow from the side walls, it achieves three-dimensional dehumidification, significantly reducing the humidity inside the cable trench, providing a dry and safe operating environment for the cables, and extending equipment lifespan. The construction process provided by this invention involves simultaneous pre-embedding of all functional pipes and grounding grids during the civil engineering phase, employing strict sealing and fixing measures to achieve integrated construction of the dehumidification function and the main structure. This saves space, ensures pre-embedding accuracy and subsequent feasibility, and guarantees long-term reliability. The dehumidification method provided by this invention is based on real-time humidity monitoring and employs multi-level linked closed-loop control logic. It automatically starts and stops dehumidification modes of different intensities according to humidity values, achieving intelligent, adaptive, all-weather operation. It boasts high dehumidification efficiency, precise energy utilization, and significantly reduces operation and maintenance costs and labor intensity.

[0008] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0009] A cable trench with built-in dehumidification function includes a base plate with a rectangular cross-section. Side walls are vertically installed around the base plate. An S-shaped heating pipe is installed inside the base plate, with both ends of the heating pipe extending upwards out of the base plate. A heating wire is installed inside the heating pipe. Several cable supports are fixedly installed on one side of the side wall facing the inside of the cable trench. Ventilation ducts are installed on the three sides of the side wall away from the cable supports. A blower is installed at one end of the ventilation duct. The blower and the heating wire are electrically connected to a control system.

[0010] The blowing device includes an air inlet, a fan, a heating wire, and an air outlet. The air outlet is connected to the ventilation duct so that, under the action of the fan, airflow enters the blowing device from the air inlet and enters the ventilation duct through the air outlet. The cable bracket is connected to a grounding angle steel via stranded wire. The grounding angle steel is connected to a grounding lead wire. The grounding lead wire is connected to a horizontal connecting conductor. Several vertical grounding electrodes are connected to the vertical direction of the horizontal connecting conductor.

[0011] A humidity sensor is installed in the middle of the side wall opposite to the cable bracket. The ventilation duct is connected to the inside of the cable trench through several air outlets. The air outlets are distributed on the three side walls away from the cable bracket. The humidity sensor is located between two air outlets and at 1 / 2 to 2 / 3 of the height of the side wall.

[0012] Furthermore, the horizontal grounding electrode is made of long flat copper and is installed in a rectangular shape around the four sides of the cable trench. The horizontal grounding electrode is buried horizontally below the cable trench, with the two opposite sides of the horizontal grounding electrode being the short sides and the other two sides being the long sides. The horizontal grounding electrode is a conductor buried horizontally underground. The vertical grounding electrode is made of long copper pipe, and several vertical grounding electrodes are installed vertically on the long side of the horizontal grounding electrode. The vertical grounding electrode is a conductor driven vertically into the ground.

[0013] Furthermore, the ratio of the length of the short side to the long side of the horizontal grounding electrode is 1:3.5; the length of the vertical grounding electrode is 1.5-2.5m.

[0014] Furthermore, several vertical grounding electrodes are installed on the same long side of the horizontal grounding electrode, and the length ratio between two adjacent vertical grounding electrodes is 1:1; the length from the vertical grounding electrode at both ends of the edge to the short side of the horizontal grounding electrode is in the ratio of the length between the two vertical grounding electrodes to 1:4.

[0015] Furthermore, a drying device is installed between the fan and the air outlet. The drying device includes a housing connecting the fan and the air outlet. A filter screen, an adsorption screen, and a dust-preventing and anti-clogging screen are sequentially installed from the air inlet side to the air outlet side of the housing. The adsorption screen is filled with adsorbent filler, which is a porous material with strong hygroscopic properties. The dust-preventing and anti-clogging screen is made of metal wire mesh or sintered filter plate. The heating wire is wound and installed on the inner wall of the housing.

[0016] A construction process for a cable trench with built-in dehumidification function, the process comprising the following steps:

[0017] Fabricate the base plate and side wall templates for the cable trench; lay the horizontal grounding electrodes into a rectangular frame, and drive vertical grounding electrodes vertically into the two long sides of the horizontal grounding electrodes, evenly installing several vertical grounding electrodes on each long side; install the cable trench base plate template, with heating pipes pre-embedded in the base plate; install the side wall template, pre-embedding ventilation ducts in the side wall opposite the cable brackets in the design drawings; the ends of both the heating and ventilation ducts extend beyond the template, and the openings of both the heating and ventilation ducts are sealed; fix the cable brackets to one side of the side wall; confirm that the elevation, the position of the pre-embedded heating and ventilation ducts, the fixing condition, and the sealing condition are all qualified, pour concrete, and cure the poured concrete; after demolding the concrete, remove the sealing materials from the openings of the heating and ventilation ducts, thread the heating wires into the heating ducts using a wire threader, and connect the ventilation ducts to the blower; the heating wires, as a load, are connected to the control circuit of the control system along with the blower fan and heating wires of the blower; install a humidity sensor and connect the signal to the control system.

[0018] Furthermore, after the cable trench bottom plate template is installed in place, heating pipes are laid on the bottom plate template in an S-shaped path, and the S-shaped heating pipes are fixed to the steel reinforcement skeleton of the bottom plate using steel reinforcement brackets and binding wires.

[0019] Furthermore, the heating pipes are made of stainless steel or galvanized steel, with an S-shaped pitch of 0.9m-1.8m. The heating pipes extend 5cm upwards from the bottom plate template, and the pipe diameter is larger than the heating wire diameter.

[0020] A method for dehumidifying a cable trench with built-in dehumidification function, the method comprising the following steps:

[0021] Step 1, Power-on and Safety Monitoring: After the power is turned on, the control system continuously monitors the voltage and current of the power supply circuit in real time. When any abnormality is detected in either the voltage or current parameter, the power is immediately cut off and the system enters the protection state. When the electrical parameters are normal, the system executes the subsequent steps.

[0022] Step 2, Humidity parameter update check: The system checks whether the humidity setting value has been updated. When the humidity setting value has been updated, the system reads and saves the latest setting parameter; when the humidity setting value has not been updated, the parameter value set last time will be used.

[0023] Step 3, Ambient Humidity Reading: Read the current humidity value using a humidity sensor;

[0024] Step 4, Humidity Range Determination and Mode Execution: The system determines the range of humidity based on the current humidity value and executes the corresponding dehumidification mode.

[0025] Step 5: Repeat steps 3 and 4.

[0026] Furthermore, step four, humidity range determination and mode execution, includes:

[0027] Standby mode: When the detected humidity is <50%, the blower, heating wire and heating wire in the heating pipe will not work; every 20 seconds, return to step three and re-read the ambient humidity.

[0028] Ventilation mode: When 50%≤detected humidity<60%, start the blower to output dry and cold air. After 5 minutes, return to step three and re-read the ambient humidity.

[0029] Hot air mode: When 60%≤detected humidity<70%, start the blower and heating wire of the blower to output dry hot air. After 5 minutes, return to step three and re-read the ambient humidity.

[0030] Powerful dehumidification mode: When the detected humidity is ≥70%, the blower and heating wire are activated to output dry hot air and start the heating wire in the heating pipe. After 5 minutes, return to step three and re-read the ambient humidity.

[0031] Compared with the prior art, the beneficial effects of the present invention are:

[0032] This invention pre-embeds S-shaped heating pipes in the base plate and ventilation pipes in the side walls, connecting them to a blower and control system. By combining bottom heating and evaporation with forced airflow from the side walls, it achieves three-dimensional dehumidification, significantly reducing humidity inside the cable trench. This provides a dry and safe operating environment for the cables, extending equipment lifespan. The construction process provided by this invention involves simultaneously pre-embedding all functional pipes and grounding grids during the civil engineering phase, employing strict sealing and fixing measures. This achieves integrated construction of the dehumidification function and the main structure, saving space, ensuring pre-embedding accuracy and subsequent feasibility, and guaranteeing long-term reliability. The dehumidification method provided by this invention is based on real-time humidity monitoring and employs multi-level linked closed-loop control logic. It automatically starts and stops dehumidification modes of different intensities according to humidity values, achieving intelligent, adaptive, all-weather operation. It boasts high dehumidification efficiency, precise energy utilization, and significantly reduces operation and maintenance costs and labor intensity. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of the horizontal cross-section of the cable trench of the present invention;

[0034] Figure 2 This is a schematic diagram of the vertical cross-section of the cable trench of the present invention;

[0035] Figure 3 This is a schematic diagram of the laying of heating pipes before concrete pouring in this invention;

[0036] Figure 4 This is a schematic diagram of the laying of heating pipes after concrete pouring in this invention;

[0037] Figure 5 This is a schematic diagram of the blower device of the present invention;

[0038] Figure 6 This is a system flow diagram of the dehumidification method of the present invention.

[0039] In the diagram: 1. Heating pipe; 2. Ventilation pipe; 3. Cable bracket; 4. Blower; 41. Air inlet; 42. Fan; 43. Heating wire; 44. Drying device; 45. Air outlet; 5. Base plate; 6. Side wall; 71. Grounding lead; 72. Horizontal grounding electrode; 73. Vertical grounding electrode; 8. Humidity sensor. Detailed Implementation

[0040] The technical solution of the present invention will be clearly and completely described below. 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.

[0041] Example 1:

[0042] Please see Figure 1-4 A cable trench with built-in dehumidification function includes a base plate 5 with a rectangular cross-section. Side walls 6 are vertically installed around the base plate 5. An S-shaped heating pipe 1 is installed inside the base plate 5, and a heating wire is installed inside the heating pipe 1. Several cable supports 3 are fixedly installed on one inward-facing side of the side wall 6. Ventilation ducts 2 are installed on the three sides of the side wall 6 away from the cable supports 3. A blower 4 is installed at one end of the ventilation duct 2. The blower 4 and the heating wire are electrically connected to a control system. Both ends of the heating pipe 1 extend upwards from the base plate 5. The blower 4 includes an air inlet 41, a fan 42, a heating wire 43, and an air outlet 45. The air outlet 45 connects to the ventilation duct 2 so that airflow from the air inlet is forced by the fan 42. The air blower 4 enters through the air outlet 41 and enters the ventilation duct 2 through the air outlet 45. The cable bracket 3 is connected to the grounding angle steel through stranded wire. The grounding angle steel is connected to the grounding lead 71. The grounding lead 71 is connected to the horizontal grounding electrode 72. Several vertical grounding electrodes 73 are connected in the vertical direction of the horizontal grounding electrode 72. A humidity sensor 8 is installed in the middle of the side wall 6 opposite to the cable bracket 3. The ventilation duct 2 is connected to the inside of the cable trench through several air outlets. Several air outlets are distributed on the three side walls 6 away from the cable bracket 3. The humidity sensor 8 is located between two air outlets. The humidity sensor 8 is located at 1 / 2-2 / 3 of the height of the side wall 6, so as to avoid the airflow and heating wire interfering with the reading of the humidity sensor 8.

[0043] The cable trench provided by this invention achieves dehumidification by combining evaporative heating with convection ventilation, and its operation is controlled by a base control system.

[0044] The heating wires inside the S-shaped heating pipe 1 are controlled by the control system to generate heat. The heat is conducted to the surface of the concrete base slab 5, providing the heat energy required for the evaporation of the liquid water accumulated at the bottom of the trench, turning it into water vapor and reducing moisture at the source.

[0045] As an air handling unit, the blower 4 draws in air through the fan 42 to generate a dry airflow. The airflow is evenly delivered into the cable trench through the ventilation duct 2 and the blower outlet. The dry air mixes with the high humidity air in the trench, reducing the overall relative humidity inside the cable trench. The forced airflow discharges water vapor generated by evaporation at the bottom of the cable trench out of the trench, achieving efficient gas replacement.

[0046] Humidity sensor 8 is installed in the middle of side wall 6, away from interference sources, to accurately detect the humidity signal inside the actual cable trench where the cable is located, and transmit the data to the control system.

[0047] The horizontal grounding electrode 72 is made of long, flat copper and is installed in a rectangular shape around the four sides of the cable trench. The horizontal grounding electrode 72 is buried horizontally below the cable trench. Two of the sides of the horizontal grounding electrode 72 are short sides with a length of 4m, and the other two sides are long sides with a length of 14m. The horizontal grounding electrode 72 is a conductor buried horizontally in the ground to ensure that the current flows safely into the earth. The vertical grounding electrode 73 is made of long copper pipe with a length of 2m. Several vertical grounding electrodes 73 are installed vertically on both sides of the 14m long horizontal grounding electrode 72. The vertical grounding electrode 73 is a conductor driven vertically into the ground to reduce the grounding resistance.

[0048] The horizontal grounding electrode 72 is laid around the cable trench in a complete rectangular ring, thereby limiting the potential of the cable trench itself and all metal components to a substantially equal level. In the event of a fault or lightning strike, it effectively prevents dangerous potential differences between points inside the cable trench, thus avoiding safety accidents caused by step voltage or contact voltage.

[0049] The horizontal grounding electrode 72, as the main current discharge conductor, contacts the soil with a large surface area, initially diffusing the fault current into the surrounding soil; the vertical grounding electrode 73 goes deep into the ground, penetrating the surface soil with higher resistivity, and contacting the deeper soil layer with lower resistivity and higher moisture content, increasing the contact area with the soil, providing a smoother path for the current to enter the ground, thereby reducing the total grounding resistance.

[0050] The horizontal grounding electrode 72 and the vertical grounding electrode 73 together form a composite grounding grid. The horizontal grounding electrode 72 is responsible for expanding the current discharge range laterally, while the vertical grounding electrode 73 is responsible for penetrating the low-resistance ground layer vertically. The combination of the two achieves the technical effect of efficiently and quickly and safely introducing large currents into the ground.

[0051] The vertical grounding electrodes 73 are evenly distributed along the long side of the horizontal grounding electrodes 72. While effectively expanding the discharge area, this reduces the cost of laying vertical grounding electrodes 73 on each side of the horizontal grounding electrodes 72, thus reducing the grounding resistance economically and efficiently.

[0052] Four vertical grounding electrodes 73 are installed on the same long side of the horizontal grounding electrode 72, and the length ratio between two adjacent vertical grounding electrodes 73 is 1:1; the length from the vertical grounding electrode 73 at both ends of the edge to the short side of the horizontal grounding electrode 72 is 1:4 compared with the length between two vertical grounding electrodes 73.

[0053] The four vertical grounding electrodes 73 installed on the long side of the horizontal grounding electrode 72 are arranged at equal intervals so that when the current is discharged from the horizontal grounding electrode 72 to the ground, the discharge task undertaken by each vertical grounding electrode 73 is relatively equal, thereby avoiding the problem that some vertical grounding electrodes 73 are overloaded due to the installation position layout, while the utilization rate of other vertical grounding electrodes 73 is insufficient.

[0054] The ratio of the length of the short side of the vertical grounding electrode 73 at both ends to the short side of the horizontal grounding electrode 72 is 1:4 with respect to the length between the two vertical grounding electrodes 73. This means the end vertical grounding electrodes 73 are not installed at either end of the long side of the horizontal grounding electrode 72. This is because the current dissipation density of conductors at the edges and corners of the rectangular horizontal grounding electrode 72 is typically higher than that at the center, and higher potentials are easily formed at the corners. The installation layout of the vertical grounding electrodes 73 in this invention, by moving the end vertical grounding electrodes 73 towards the center of the horizontal grounding electrode 72, adjusts the current dissipation point of the vertical grounding electrodes 73 from the edges and corners of the horizontal grounding electrode 72 to the central area of ​​the horizontal grounding electrode 72, thereby smoothing the potential distribution and greatly improving safety.

[0055] A drying device 44 is installed between the blower 42 and the air outlet 45 of the blowing device 4. The drying device 44 includes a housing connecting the blower 42 and the air outlet 45. A filter screen, an adsorption screen, and a dust-preventing and anti-clogging screen are installed sequentially from the air inlet side to the air outlet side of the housing. The filter screen is used to filter larger particles in the air and prevent particles from contaminating and clogging the pores of the adsorption screen. The adsorption screen is filled with adsorbent filler, which is a porous material with strong hygroscopicity. The adsorbent filler is selected from molecular sieves or activated alumina. The dust-preventing and anti-clogging screen is made of metal wire mesh or sintered filter plate to prevent fine powder generated by the adsorbent filler under the action of airflow from being blown into the ventilation duct 2.

[0056] Heating wire 43 is wound and installed on the inner wall of the outer shell of the drying device 44 so as to heat and regenerate the adsorbent packing while hot air is blown.

[0057] The airflow generated by the fan 42 directly heats the airflow when the heating wire 43 is activated. The pre-heated airflow passes through the outer shell of the drying device 44, filters out larger particles in the air through the filter screen, and then passes through the pores of the adsorbent packing. Water molecules in the airflow are adsorbed by the adsorbent packing, so that dry hot airflow flows out from the air outlet side of the drying device 44. The hot airflow is sent into the cable trench through the ventilation duct 2, thereby achieving the effect of hot air dehumidification.

[0058] The drying device 44 in this invention ensures that the airflow sent into the cable trench is dry air, avoiding the blowing in of untreated humid air. At the same time, it protects the internal components of the blowing device 4 in a dry environment, preventing internal corrosion and thus extending the overall service life of the cable trench.

[0059] Example 2:

[0060] Please see Figure 1-6 A cable trench construction process with built-in dehumidification function, according to Example 1, includes the following steps:

[0061] Step 1: Based on the design drawings, make the base plate template and side wall template for the cable trench.

[0062] Step 2: Lay out the long flat copper horizontal grounding electrode into a rectangular frame, with two short sides of 4m and two long sides of 14m. On the two 14m long sides of the horizontal grounding electrode, drive in long copper tubes as vertical grounding electrodes, each 2m long. Install 4 vertical grounding electrodes evenly on each long side, with equal spacing between adjacent vertical grounding electrodes. The ratio of the distance from the vertical grounding electrode at both ends to the corner of the short side of the horizontal grounding electrode to the spacing between two adjacent vertical grounding electrodes is 1:4.

[0063] Step 3: Install the bottom plate template of the cable trench, and pre-embed heating pipes in the bottom plate; install the side wall template, and pre-embed ventilation pipes in the side wall opposite the cable bracket in the design drawings; the ends of the heating pipes and ventilation pipes extend out of the template to facilitate subsequent splicing and wiring operations; the openings of the heating pipes and ventilation pipes are sealed.

[0064] Specifically, after the cable trench bottom plate formwork is installed in place, heating pipes are laid on the bottom plate formwork in an S-shaped path. The S-shaped heating pipes are fixed to the steel reinforcement skeleton of the bottom plate using steel reinforcement brackets and binding wires to prevent displacement, floating or deformation during concrete pouring.

[0065] The heating pipes are made of stainless steel or galvanized steel. The S-pitch of the heating pipes is 0.9m-1.8m. The heating pipes extend 5cm upwards from the bottom plate template. The diameter of the heating pipes is larger than the diameter of the heating wires to ensure smooth subsequent wiring.

[0066] Step 4: Fix the cable bracket on one side of the side wall; confirm that the elevation, the location of the pre-embedded heating pipe and ventilation pipe, the fixing status and the sealing status are all qualified, pour concrete, smooth and finish the concrete after pouring, and cover and cure it in time.

[0067] Step 5: After the concrete curing period is over and the formwork is removed, remove the blockages from the openings of the heating pipes and ventilation pipes. Thread the heating wires into the heating pipes using a wire threader. Connect the ventilation pipes to the blower using a hose and flange. The heating wires, acting as a load, are connected to the control circuit of the control system along with the blower's fan and heating wires. Install a humidity sensor and connect its signal to the control system.

[0068] In the construction process provided by this invention, both the heating pipes and ventilation pipes are pre-embedded during the civil construction phase, integrating seamlessly with the main structure of the cable trench. This saves space and avoids the problem of later equipment installation occupying cable laying and maintenance channels. Furthermore, this construction process fully considers feasibility and accuracy. By sealing the ventilation and heating pipes, it ensures that cement slurry will not enter the pipes during concrete pouring, providing a fundamental guarantee for subsequent smooth wiring and connection. The ends of the heating and ventilation pipes extend beyond the formwork to facilitate alignment and connection work in subsequent processes, reducing the difficulty of interface construction. Steel reinforcement supports and binding wires are used to fix the heating pipes to the steel reinforcement skeleton of the base plate, preventing the heating pipes from floating or shifting during pouring and ensuring the accuracy of the installation position.

[0069] Example 3:

[0070] Please see Figure 1-6 A cable trench dehumidification method with built-in dehumidification function, according to Embodiment 1, includes the following steps:

[0071] Step 1, Power-on and Safety Monitoring: After the power is turned on, the control system continuously monitors the voltage and current of the power supply circuit in real time. When any abnormality is detected in either the voltage or current parameter, the power is immediately cut off and the system enters the protection state. When the electrical parameters are normal, the system executes the subsequent steps.

[0072] Step 2, Humidity parameter update check: The system checks whether the humidity setting value has been updated. When the humidity setting value has been updated, the system reads and saves the latest setting parameter; when the humidity setting value has not been updated, the parameter value set last time will be used.

[0073] Step 3, Ambient Humidity Reading: Read the current humidity value using a humidity sensor;

[0074] Step 4, Humidity Range Determination and Mode Execution: The system determines the range of humidity based on the current humidity value and executes the corresponding dehumidification mode.

[0075] Step 5, loop execution: Repeat steps 3 and 4.

[0076] Preferably, step four, humidity range determination and mode execution, includes:

[0077] Standby mode: When the detected humidity is <50%, the blower, heating wire and heating wire in the heating pipe will not work; every 20 seconds, return to step three and re-read the ambient humidity.

[0078] Ventilation mode: When 50%≤detected humidity<60%, start the blower to output dry and cold air. After 5 minutes, return to step three and re-read the ambient humidity.

[0079] Hot air mode: When 60%≤detected humidity<70%, start the blower and heating wire of the blower to output dry hot air. After 5 minutes, return to step three and re-read the ambient humidity.

[0080] Powerful dehumidification mode: When the detected humidity is ≥70%, the blower and heating wire are activated to output dry hot air and start the heating wire in the heating pipe. After 5 minutes, return to step three and re-read the ambient humidity.

[0081] The dehumidification method provided by this invention continuously senses the humidity level inside the cable trench using a humidity sensor, compares this humidity level with multiple preset humidity thresholds, and makes a judgment based on the comparison results to control the humidity below the target value. This results in high dehumidification efficiency. Simultaneously, it activates the load in stages according to the severity of humidity, avoiding energy waste. It operates in standby mode during low humidity and at full capacity during high humidity, resulting in significant energy savings. Because this invention determines different humidity ranges and executes corresponding dehumidification modes, the control system provided by this invention adjusts its execution strategy according to environmental climate changes. The entire process requires no manual intervention; the system automatically completes the entire process of monitoring, judgment, and execution, greatly reducing the labor costs of daily inspections, manual operation, and maintenance, and ensuring that the cable trench is always kept in an optimal dry state.

[0082] 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 trench with built-in dehumidification function, characterized in that: The system includes a base plate with a rectangular cross-section. Side walls are vertically installed around the base plate. An S-shaped heating pipe is installed inside the base plate, with both ends of the heating pipe extending upwards out of the base plate. A heating wire is installed inside the heating pipe. Several cable supports are fixedly installed on one side of the side wall facing the cable trench. Ventilation ducts are installed on the three sides of the side wall away from the cable supports. A blower is installed at one end of the ventilation duct. The blower and the heating wire are electrically connected to the control system. The blowing device includes an air inlet, a fan, a heating wire, and an air outlet. The air outlet is connected to the ventilation duct so that, under the action of the fan, airflow enters the blowing device from the air inlet and enters the ventilation duct through the air outlet. The cable bracket is connected to a grounding angle steel via stranded wire. The grounding angle steel is connected to a grounding lead wire. The grounding lead wire is connected to a horizontal connecting conductor. Several vertical grounding electrodes are connected to the vertical direction of the horizontal connecting conductor. A humidity sensor is installed in the middle of the side wall opposite to the cable bracket. The ventilation duct is connected to the inside of the cable trench through several air outlets. The air outlets are distributed on the three side walls away from the cable bracket. The humidity sensor is located between two air outlets and at 1 / 2 to 2 / 3 of the height of the side wall.

2. The cable trench with built-in dehumidification function according to claim 1, characterized in that: The horizontal grounding electrode is made of long flat copper and is installed in a rectangular shape around the four sides of the cable trench. The horizontal grounding electrode is buried horizontally below the cable trench, with the two opposite sides being the short sides and the other two sides being the long sides. The horizontal grounding electrode is a conductor buried horizontally underground. The vertical grounding electrode is made of long copper pipe, and several vertical grounding electrodes are installed vertically on the long side of the horizontal grounding electrode. The vertical grounding electrode is a conductor driven vertically into the ground.

3. A cable trench with built-in dehumidification function according to claim 2, characterized in that: The ratio of the length of the short side to the long side of the horizontal grounding electrode is 1:3.5; the length of the vertical grounding electrode is 1.5-2.5m.

4. A cable trench with built-in dehumidification function according to claim 2, characterized in that: Several vertical grounding electrodes are installed on the same long side of the horizontal grounding electrode, and the length ratio between two adjacent vertical grounding electrodes is 1:1; the length from the vertical grounding electrode at both ends of the edge to the short side of the horizontal grounding electrode is in the ratio of the length between the two vertical grounding electrodes to 1:

4.

5. A cable trench with built-in dehumidification function according to claim 1, characterized in that: A drying device is installed between the fan and the air outlet. The drying device includes a housing that connects the fan and the air outlet. A filter screen, an adsorption screen, and a dust-preventing and anti-clogging screen are installed sequentially from the air inlet side to the air outlet side of the housing. The adsorption screen is filled with adsorbent filler, which is a porous material with strong hygroscopic properties. The dust-preventing and anti-clogging screen is made of metal wire mesh or sintered filter plate. The heating wire is wound and installed on the inner wall of the housing.

6. A cable trench construction process with built-in dehumidification function, characterized in that: The process is used for constructing a cable trench with built-in dehumidification function as described in any one of claims 1-5, and the process includes the following steps: Fabricate the base plate and side wall templates for the cable trench; lay the horizontal grounding electrodes into a rectangular frame, and drive vertical grounding electrodes vertically into the two long sides of the horizontal grounding electrodes, evenly installing several vertical grounding electrodes on each long side; install the cable trench base plate template, with heating pipes pre-embedded in the base plate; install the side wall template, pre-embedding ventilation ducts in the side wall opposite the cable brackets in the design drawings; the ends of both the heating and ventilation ducts extend beyond the template, and the openings of both the heating and ventilation ducts are sealed; fix the cable brackets to one side of the side wall; confirm that the elevation, the position of the pre-embedded heating and ventilation ducts, the fixing condition, and the sealing condition are all qualified, pour concrete, and cure the poured concrete; after demolding the concrete, remove the sealing materials from the openings of the heating and ventilation ducts, thread the heating wires into the heating ducts using a wire threader, and connect the ventilation ducts to the blower; the heating wires, as a load, are connected to the control circuit of the control system along with the blower fan and heating wires of the blower; install a humidity sensor and connect the signal to the control system.

7. The cable trench construction process with built-in dehumidification function according to claim 6, characterized in that: After the cable trench bottom plate template is installed in place, heating pipes are laid on the bottom plate template in an S-shaped path, and the S-shaped heating pipes are fixed to the steel reinforcement skeleton of the bottom plate using steel reinforcement brackets and binding wires.

8. The cable trench construction process with built-in dehumidification function according to claim 7, characterized in that: The heating pipes are made of stainless steel or galvanized steel. The S-pitch of the heating pipes is 0.9m-1.8m. The heating pipes extend 5cm upwards from the bottom plate template. The diameter of the heating pipes is larger than the diameter of the heating wires.

9. A method for dehumidifying cable trenches with built-in dehumidification function, characterized in that: The method employs a cable trench with built-in dehumidification function as described in any one of claims 1-5, and the method includes the following steps: Step 1, Power-on and Safety Monitoring: After the power is turned on, the control system continuously monitors the voltage and current of the power supply circuit in real time. When any abnormality is detected in either the voltage or current parameter, the power is immediately cut off and the system enters the protection state. When the electrical parameters are normal, the system executes the subsequent steps. Step 2, Humidity parameter update check: The system checks whether the humidity setting value has been updated. When the humidity setting value has been updated, the system reads and saves the latest setting parameter; when the humidity setting value has not been updated, the parameter value set last time will be used. Step 3, Ambient Humidity Reading: Read the current humidity value using a humidity sensor; Step 4, Humidity Range Determination and Mode Execution: The system determines the range of humidity based on the current humidity value and executes the corresponding dehumidification mode. Step 5: Repeat steps 3 and 4.

10. A cable trench dehumidification method with built-in dehumidification function according to claim 9, characterized in that: Step four, humidity range determination and mode execution, includes: Standby mode: When the detected humidity is <50%, the blower, heating wire and heating wire in the heating pipe will not work; every 20 seconds, return to step three and re-read the ambient humidity. Ventilation mode: When 50%≤detected humidity<60%, start the blower to output dry and cold air. After 5 minutes, return to step three and re-read the ambient humidity. Hot air mode: When 60%≤detected humidity<70%, start the blower and heating wire of the blower to output dry hot air. After 5 minutes, return to step three and re-read the ambient humidity. Powerful dehumidification mode: When the detected humidity is ≥70%, the blower and heating wire are activated to output dry hot air and start the heating wire in the heating pipe. After 5 minutes, return to step three and re-read the ambient humidity.

Images