A micro-positive pressure ventilation system for a cable trench

Abstract

The utility model relates to the technical field of ventilation system, aims at solving the problem of the prior art that the cable trench sand filling of explosion danger zone hinders single core cable, bus duct heat dissipation causes its easy damage, and explosion -proof and heat dissipation are difficult to be compatible, and the equipment is easy to damage, provides a kind of micro positive pressure ventilation system of cable trench, including cable trench and air supply unit;The top of cable trench has groove cover, and explosion -proof wall is installed on groove cover, and explosion danger zone and non-explosion danger zone have on both sides of explosion -proof wall, and PLC control system has on the side close to non-explosion danger zone of explosion -proof wall;Temperature sensor, gas detector and pressure sensor that are electrically connected with PLC control system are in cable trench;Air supply unit is communicated with cable trench and is electrically connected with PLC control system.The utility model has the beneficial effects that simple structure is practical, ventilation heat dissipation effect is excellent, reduces energy consumption using frequency conversion fan, can block the invasion of explosive dangerous gas, avoids the heat gathering in the trench, guarantees the stable operation of equipment and the high degree of intelligentization of operation management.

Description

Technical Field

[0001] This utility model relates to the field of ventilation system technology, and more specifically, to a micro-positive pressure ventilation system for cable trenches. Background Technology

[0002] In industrial sites with explosion hazards, the safety of cable laying within the explosion hazard zone is of paramount importance. According to current safety regulations and industry practices, cable trenches within the explosion hazard zone are generally treated by sand filling. The sand filling process fills the gaps in the cable trench with inert materials such as dry quartz sand, which can effectively block the air flow in the trench and prevent flammable and explosive gases from accumulating in the trench and forming an explosive mixture. At the same time, the sand can limit the spread of flames, reduce the risk of fire spreading when a cable fault occurs, and also play a certain role in mechanical protection, preventing external debris from entering the trench and damaging the cable.

[0003] However, with the increase in industrial electricity load, high-power power distribution equipment such as single-core cables and busbars are often laid in cable trenches in explosion hazard areas. These devices generate a lot of heat during operation, and their heat dissipation performance directly affects the safe and stable operation of the equipment. If the traditional sand filling method is still used, the sand, as a loose accumulation material with low thermal conductivity, will form a closed heat insulation layer around the equipment, hindering the heat exchange between the equipment and the external environment. The heat generated by the equipment cannot be dissipated in time, which will cause the temperature in the trench to rise continuously, accelerate the aging of the single-core cable insulation layer and reduce the current carrying capacity of the busbar.

[0004] Prolonged operation at high temperatures not only reduces the service life of equipment, but may also cause faults such as insulation breakdown and short circuits. In severe cases, it may even induce fires or explosions in areas with explosion hazards, posing a significant threat to production safety. In addition, frequent shutdowns for maintenance to solve heat dissipation problems will affect the continuity of industrial production and increase operation and maintenance costs. Utility Model Content

[0005] The present invention aims to provide a micro-positive pressure ventilation system for cable trenches to solve the problems in the prior art where filling cable trenches in explosion-hazardous areas with sand obstructs the heat dissipation of single-core cables and busbar trunking, making them prone to damage, and the incompatibility between explosion protection and heat dissipation, resulting in easy equipment damage.

[0006] The embodiments of this utility model are implemented as follows: This utility model embodiment provides a micro-positive pressure ventilation system for cable trenches, which includes cable trenches; The top of the aforementioned cable trench is equipped with a trench cover plate, and an explosion-proof wall is installed on the trench cover plate. There are explosion hazard zones and non-explosion hazard zones on both sides of the aforementioned explosion-proof wall. A PLC control system is installed on the side of the aforementioned explosion-proof wall closer to the aforementioned non-explosion hazard zone. One end of the aforementioned cable trench is located in the aforementioned explosion hazard zone and is equipped with a temperature sensor and a gas detector, while the other end of the aforementioned cable trench is located in the aforementioned non-explosion hazard zone and is equipped with a pressure sensor. The temperature sensor, the gas detector, and the pressure sensor mentioned above are all electrically connected to the PLC control system. The aforementioned non-explosive hazardous area is equipped with a ventilation unit, which is connected to the aforementioned cable trench and electrically connected to the PLC control system.

[0007] In use, the temperature sensor, gas detector, and pressure sensor monitor various data within the cable trench. When an abnormal state occurs, the temperature sensor, gas detector, and pressure sensor transmit the corresponding data to the PLC control system on the explosion-proof wall. The PLC control system then controls the ventilation unit to start and blow air into the cable trench according to the set control program, preventing explosive gases in the explosion hazard zone from entering the cable trench and the non-explosion hazard zone.

[0008] The micro-positive pressure ventilation system for cable trenches disclosed in this embodiment monitors the conditions inside the cable trench in real time through the aforementioned temperature sensor, gas detector, and pressure sensor. This facilitates the PLC control system to control the operation of the air supply unit, enabling the cable trench to achieve excellent ventilation and heat dissipation. Consequently, this micro-positive pressure ventilation system for cable trenches has the following advantages: simple and practical structure, excellent ventilation and heat dissipation effect, reduced energy consumption by using variable frequency fans, ability to block the intrusion of explosive gases, prevention of heat accumulation in the trench, ensuring stable equipment operation, and a high degree of intelligent operation management.

[0009] Optionally: The aforementioned air supply unit is installed on the ground in the aforementioned non-explosion hazard zone, and the air supply unit has a fan inside, with the fan outlet located on the side close to the aforementioned cable trench.

[0010] With this configuration, the aforementioned fan can provide airflow, making it easy to blow air into the aforementioned cable trench, thereby achieving the ventilation and cooling requirements within the cable trench.

[0011] Optionally: the blower unit has a flange at one end near the cable trench, and a blower pipe is connected to the flange. The end of the blower pipe away from the blower unit passes through the trench cover and is located inside the cable trench.

[0012] This configuration, by using the aforementioned flange to connect with the aforementioned air supply pipe, facilitates the disassembly and assembly of the aforementioned air supply pipe, and makes it easier to replace the aforementioned air supply pipe.

[0013] Optionally, the air supply pipe has a connecting plate radially at one end near the cable trench, and the connecting plate is fixedly installed on the trench cover plate by several bolts.

[0014] With this setup, the air supply pipe is securely installed on the trench cover plate using several of the aforementioned bolts, ensuring stable operation of the air supply pipe and maintaining a tight seal between the cable trench and the air supply pipe to prevent gas leakage from affecting the ventilation and cooling effect within the cable trench.

[0015] Optionally, the above-mentioned air supply duct is made of PVC pipe.

[0016] With this configuration, the aforementioned air supply duct uses PVC pipe, which is corrosion-resistant, lightweight, easy to install, low-cost, and has good chemical stability. This reduces the air leakage or damage caused by rust and aging of the air supply duct, effectively extending its service life and reducing installation and maintenance costs.

[0017] Optionally: The PVC pipe of the above-mentioned air supply duct has a waterproof adhesive.

[0018] With this setup, applying waterproof adhesive to the PVC pipe of the aforementioned air supply duct can effectively enhance the sealing of the pipe joints or surface, preventing water vapor carried by the airflow inside the air supply duct from penetrating or external moisture from entering, avoiding aging and corrosion of the pipe due to moisture, while ensuring the air supply efficiency of the aforementioned air supply duct and the dryness of the surrounding environment, thereby improving the service life and operational reliability of the aforementioned air supply duct.

[0019] Optionally: The above-mentioned air supply unit is customized according to the micro-positive pressure ventilation volume and adopts a variable frequency fan.

[0020] With this configuration, the aforementioned air supply unit, customized according to the micro-positive pressure ventilation volume and using a variable frequency fan, achieves a comprehensive effect of stable air pressure, energy saving and consumption reduction, extended equipment life and enhanced scene adaptability in the cable trench environment.

[0021] Optionally, an electrolytic cell is connected to one end of the cable trench.

[0022] With this configuration, the electrolytic cell is used to produce hydrogen. Placing one end of the cable trench outlet below the electrolytic cell facilitates the connection of the cable. At the same time, the blower unit prevents explosive gases from entering the cable trench and avoids heat accumulation in the cable trench, thereby ensuring the stable operation of the cable or equipment in the cable trench.

[0023] Optionally, a power distribution cabinet is also provided on the trench cover plate in the non-explosion hazard area, and the power distribution cabinet is connected to the electrolytic cell via a cable.

[0024] With this setup, the power distribution cabinet provides DC power to the electrolyzer for hydrogen production, and the cables are placed in the cable trench. This facilitates the connection between the power distribution cabinet and the electrolyzer, and also helps to cool the cables.

[0025] Optionally: The above-mentioned PLC control system is a programmable logic controller and a network communication device.

[0026] With this configuration, the programmable logic controller can easily display and process the operating status of each device, and the network communication equipment can realize local and remote intelligent control and management. This not only meets the ventilation and cooling requirements in the cable trench, but also ensures ventilation safety, energy saving and consumption reduction, and transforms passive into active, improving the safety of the cable trench's operating environment and achieving a high degree of intelligent operation and management.

[0027] In summary, the micro-positive pressure ventilation system for cable trenches disclosed in this utility model has the following advantages: simple and practical structure, excellent ventilation and heat dissipation effect, energy consumption reduction by using a variable frequency fan, ability to block the intrusion of explosive gases, prevention of heat accumulation in the trench, and high degree of intelligent operation and management of equipment. Attached Figure Description

[0028] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 This is a schematic diagram of the structure of a micro-positive pressure ventilation system for a cable trench according to an embodiment of this utility model; Figure 2 This is a system flowchart of the PLC control system in an embodiment of the present invention.

[0030] Icons: 1-Cable trench, 2-Trench cover, 3-Explosion-proof wall, 4-Explosion hazard zone, 5-Non-explosion hazard zone, 6-PLC control system, 7-Temperature sensor, 8-Gas detector, 9-Pressure sensor, 10-Blower unit, 11-Fan, 12-Flange, 13-Blower duct, 14-Connecting plate, 15-Bolt, 16-Electrolytic cell, 17-Distribution cabinet, 18-Cable. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0032] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0033] Example See Figure 1 and Figure 2 This embodiment proposes a micro-positive pressure ventilation system for cable trenches, including cable trench 1; The top of the cable trench 1 is provided with a trench cover plate 2, and an explosion-proof wall 3 is installed on the trench cover plate 2. There are explosion hazard zones 4 and non-explosion hazard zones 5 on both sides of the explosion-proof wall 3. A PLC control system 6 is installed on the side of the explosion-proof wall 3 closest to the non-explosion hazard zone 5. One end of cable trench 1 is located in the explosion hazard zone 4 and is equipped with a temperature sensor 7 and a gas detector 8. The other end of cable trench 1 is located in the non-explosion hazard zone 5 and is equipped with a pressure sensor 9. Temperature sensor 7, gas detector 8, and pressure sensor 9 are all electrically connected to PLC control system 6; The non-explosive hazardous area 5 is equipped with a blower unit 10, which is connected to the cable trench 1 and electrically connected to the PLC control system 6.

[0034] During use, temperature sensor 7, gas detector 8, and pressure sensor 9 monitor various data within cable trench 1. When an abnormal state occurs, temperature sensor 7, gas detector 8, and pressure sensor 9 transmit the corresponding data to the PLC control system 6 on the explosion-proof wall 3. The PLC control system 6 then controls the ventilation unit 10 to start and blow air into cable trench 1 according to the set control program, preventing explosive gases in the explosion hazard zone 4 from entering cable trench 1 and non-explosion hazard zone 5.

[0035] The micro-positive pressure ventilation system for cable trenches disclosed in this embodiment monitors the conditions inside the cable trench 1 in real time through temperature sensor 7, gas detector 8, and pressure sensor 9, which facilitates the PLC control system 6 to control the operation of the air supply unit 10. This enables the cable trench 1 to achieve excellent ventilation and heat dissipation effects. Consequently, the micro-positive pressure ventilation system for cable trenches has the following advantages: simple and practical structure, excellent ventilation and heat dissipation effect, energy consumption reduction through the use of variable frequency fans, ability to block the intrusion of explosive gases, prevention of heat accumulation in the trench, ensuring stable equipment operation, and a high degree of intelligent operation management.

[0036] See Figure 1 and Figure 2The air supply unit 10 is installed on the ground in the non-explosion hazard zone 5. The air supply unit 10 has a fan 11 inside. The air outlet of the fan 11 is located on the side close to the cable trench 1. The fan 11 can provide air force to blow air into the cable trench 1 and achieve the ventilation and cooling requirements in the cable trench 1.

[0037] The blower unit 10 has a flange 12 at one end near the cable trench 1. An air supply pipe 13 is connected to the flange 12. The end of the air supply pipe 13 away from the blower unit 10 passes through the trench cover plate 2 and is located inside the cable trench 1. By using the flange 12 to connect with the air supply pipe 13, it is easy to disassemble and install the air supply pipe 13, which is beneficial for replacing the air supply pipe 13.

[0038] The air supply duct 13 has a connecting plate 14 radially at one end near the cable trench 1. The connecting plate 14 is fixedly installed on the trench cover plate 2 by several bolts 15. The air supply duct 13 is firmly installed on the trench cover plate 2 by several bolts 15, so that the air supply duct 13 can operate stably. At the same time, it ensures the seal between the cable trench 1 and the air supply duct 13, and avoids gas leakage from affecting the ventilation and cooling effect in the cable trench 1.

[0039] The air supply duct 13 is made of PVC pipe. PVC pipe is characterized by its corrosion resistance, light weight for easy installation, low cost, and good chemical stability. This reduces air leakage or damage caused by rust and aging, effectively extending its service life and reducing installation and maintenance costs.

[0040] The PVC pipe of the air supply duct 13 has waterproof adhesive (not shown in the figure). Applying waterproof adhesive to the PVC pipe of the air supply duct 13 can effectively enhance the sealing of the pipe joints or surface, prevent water vapor carried by the airflow inside the air supply duct 13 from penetrating or external moisture from entering, avoid the pipe from aging and corrosion due to moisture, and at the same time ensure the air supply efficiency of the air supply duct 13 and the dryness of the surrounding environment, thereby improving the service life and operational reliability of the air supply duct 13.

[0041] See Figure 1 and Figure 2 The air supply unit 10 is customized according to the micro-positive pressure ventilation volume and adopts a variable frequency fan. By customizing the air supply unit 10 according to the micro-positive pressure ventilation volume and adopting a variable frequency fan, the air supply unit 10 achieves the comprehensive effects of stable air pressure in the cable trench 1, energy saving and consumption reduction, extended equipment life and enhanced scene adaptability.

[0042] An electrolytic cell 16 is connected to one end of the outlet of the cable trench 1. The electrolytic cell 16 is used to produce hydrogen. The outlet of the cable trench 1 is located below the electrolytic cell 16 to facilitate the connection of the cable 18. At the same time, the blower unit 10 is used to prevent explosive gases from entering the cable trench 1 and to avoid heat accumulation in the cable trench 1, thereby ensuring the stable operation of the cable 18 or equipment in the cable trench 1.

[0043] See Figure 1 and Figure 2 In the non-explosive hazardous area 5, a power distribution cabinet 17 is also installed on the trench cover 2. The power distribution cabinet 17 is connected to the electrolytic cell 16 through the cable 18. The power distribution cabinet 17 provides DC power for hydrogen production in the electrolytic cell 16. The cable 18 is placed in the cable trench 1, which not only facilitates the connection between the power distribution cabinet 17 and the electrolytic cell 16, but also helps to cool the cable 18.

[0044] The PLC control system 6 consists of a programmable logic controller and a network communication device. The programmable logic controller facilitates the display and processing of the operating status of each device, while the network communication device enables local and remote intelligent control and management. It not only meets the ventilation and cooling requirements in cable trench 1, but also ensures ventilation safety, energy saving and consumption reduction, and transforms passive into active, improving the safety of the cable trench 1 operating environment and achieving a high degree of intelligent operation and management.

[0045] See Figure 1 and Figure 2 In this embodiment, the micro-positive pressure ventilation system of the cable trench uses a PLC control system 6 and a PID closed-loop control system. The entire system consists of a blower unit 10, a blower duct 13, the PLC control system 6, a pressure sensor 9, a temperature sensor 7, and a gas detector 8. When the temperature and pressure inside the cable trench 1 change, the PLC control system 6 uses PID control to adjust the speed of the blower unit 10 to ensure that the cable trench 1 is always in a micro-positive pressure environment. At the same time, it can reduce the temperature inside the cable trench 1 and prevent overheating damage to the equipment. When the gas detector 8 in the cable trench 1 detects flammable, explosive, or toxic gas, it indicates that the positive pressure ventilation system has failed. The data is transmitted to the PLC control system 6 to start the blower unit 10 in an emergency, preventing the gas from entering the non-explosive hazard area 5 and causing a safety accident. This facilitates local and remote intelligent control and management, meeting the ventilation and cooling requirements inside the cable trench 1 while ensuring ventilation safety, saving energy and reducing consumption, turning passive into active, and improving the safety of the operating environment of the cable trench 1.

[0046] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A micro-positive pressure ventilation system for cable trenches, characterized in that: Including cable trenches (1); The top of the cable trench (1) is provided with a trench cover plate (2), and an explosion-proof wall (3) is installed on the trench cover plate (2). The two sides of the explosion-proof wall (3) are respectively an explosion hazard zone (4) and a non-explosion hazard zone (5). A PLC control system (6) is installed on the side of the explosion-proof wall (3) closer to the non-explosion hazard zone (5). One end of the cable trench (1) is located in the explosion hazard zone (4) and is equipped with a temperature sensor (7) and a gas detector (8); the other end of the cable trench (1) is located in the non-explosion hazard zone (5) and is equipped with a pressure sensor (9). The temperature sensor (7), the gas detector (8), and the pressure sensor (9) are all electrically connected to the PLC control system (6); The non-explosive hazardous area (5) is equipped with a blower unit (10), which is connected to the cable trench (1) and electrically connected to the PLC control system (6).

2. The micro-positive pressure ventilation system for cable trenches according to claim 1, characterized in that: The blower unit (10) is installed on the ground in the non-explosive hazardous area (5). The blower unit (10) has a fan (11) inside, and the air outlet of the fan (11) is located on the side close to the cable trench (1).

3. The micro-positive pressure ventilation system for cable trenches according to claim 2, characterized in that: The blower unit (10) has a flange (12) at one end near the cable trench (1), and a blower pipe (13) is connected to the flange (12). The end of the blower pipe (13) away from the blower unit (10) passes through the trench cover plate (2) and is located inside the cable trench (1).

4. The micro-positive pressure ventilation system for cable trenches according to claim 3, characterized in that: The air supply pipe (13) has a connecting plate (14) radially at one end near the cable trench (1), and the connecting plate (14) is fixedly installed on the trench cover plate (2) by a number of bolts (15).

5. A micro-positive pressure ventilation system for cable trenches according to claim 3, characterized in that: The air supply duct (13) is made of PVC pipe.

6. A micro-positive pressure ventilation system for cable trenches according to claim 5, characterized in that: The PVC pipe of the air supply duct (13) has waterproof adhesive.

7. A micro-positive pressure ventilation system for cable trenches according to claim 1, characterized in that: The air supply unit (10) is customized according to the micro-positive pressure ventilation volume and adopts a variable frequency fan.

8. A micro-positive pressure ventilation system for cable trenches according to claim 1, characterized in that: An electrolytic cell (16) is connected to one end of the cable trench (1).

9. A micro-positive pressure ventilation system for cable trenches according to claim 8, characterized in that: The trench cover (2) in the non-explosive hazardous area (5) is also equipped with a power distribution cabinet (17), which is connected to the electrolytic cell (16) via a cable (18).

10. A micro-positive pressure ventilation system for cable trenches according to claim 1, characterized in that: The PLC control system (6) is a programmable logic controller and a network communication device.

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