Cable trench fire extinguishing device

Abstract

The utility model relates to a cable trench fire extinguishing device, which belongs to the technical field of cables, and comprises a base, a main pipeline, a nozzle and a fire partition module for controlling the fire extinguishing control cabinet to start and stop, and a fire extinguishing control cabinet, a high-pressure atomizing pump, an air pump and a perfluoroethanone medicament storage device are fixed on the base; one end of the high-pressure atomizing pump is communicated with the interior of the perfluoroethanone medicament storage device, the other end of the high-pressure atomizing pump is communicated with the air pump, the outlet end of the air pump is communicated with one end of the main pipeline, the main pipeline is laid on the vertical side wall of the cable trench in the length direction of the cable trench, and the adjacent nozzles are arranged on the main pipeline at intervals in the length direction of the cable trench; according to the invention, the cable in the cable trench can be comprehensively monitored, the fire extinguishing range can be comprehensively covered, and the fire can be timely extinguished.

Description

Technical Field

[0001] This application relates to the technical field of cables, and in particular to a cable trench fire extinguishing device. Background Technology

[0002] Currently, cables are wires that transmit information from one place to another and are widely used in people's daily lives.

[0003] Cables operate safely under normal conditions, but when subjected to faults such as overload, short circuit, or localized overheating, or under the influence of external heat, the insulation resistance of the insulation material decreases, leading to loss of insulation capacity, combustion, and even fire accidents.

[0004] In real life, cable trenches are often in humid working environments, with high and low voltage cables running together, a large number of cables, and narrow spaces. Fires can spread rapidly in these trenches, and conventional fire extinguishing systems have drawbacks such as difficulty in achieving full coverage of the interior space, difficulty in extinguishing fires in a timely manner, and a high probability of reignition. Utility Model Content

[0005] In order to comprehensively monitor the cables in the cable trench and achieve full coverage of the fire extinguishing range and timely fire suppression, this application provides a cable trench fire extinguishing device.

[0006] The cable trench fire extinguishing device provided in this application adopts the following technical solution:

[0007] A cable trench fire extinguishing device includes a base, on which a fire extinguishing control cabinet, a high-pressure spray pump, an air pump, and a perfluoroacetone agent storage device are fixed. It also includes a main pipeline, nozzles, and a fire-resistant partition module for controlling the start and stop of the fire extinguishing control cabinet. One end of the high-pressure spray pump is connected to the interior of the perfluoroacetone agent storage device, and the other end is connected to the air pump. The outlet end of the air pump is connected to one end of the main pipeline. The main pipeline is laid along the length of the cable trench on the vertical sidewall of the cable trench. Multiple nozzles are provided, and adjacent nozzles are spaced apart along the length of the cable trench on the main pipeline.

[0008] Fire compartment modules include:

[0009] The detection unit, buried in the cable trench, is used to detect the temperature inside the cable trench and output a temperature detection signal.

[0010] The processing unit is connected to the output of the detection unit and receives the temperature detection signal. It compares the temperature detection signal with a preset reference value and outputs a temperature adjustment signal.

[0011] The execution unit is connected to the processing unit and receives the temperature regulation signal. The execution unit outputs an execution signal according to the temperature regulation signal to control the start and stop of the fire extinguishing control cabinet.

[0012] By adopting the above technical solution, the detection unit detects the temperature inside the cable trench and transmits the detected temperature to the processing unit in the form of a digital or analog signal. The processing unit compares the transmitted temperature value with the preset temperature value. When the temperature value is greater than the preset value, a low level is transmitted; when the temperature value is less than the preset value, a high level is transmitted. Finally, when the execution unit receives the low level, it activates the fire extinguishing control cabinet. The fire extinguishing control cabinet simultaneously sends start commands to the sectional valves and zone valves included in the main pipeline. After the valves are started normally, the high-pressure spray pump is activated to deliver perfluoroacetone agent to extinguish the fire in the cable trench. When the amount of extinguishing agent reaches the design requirements, the pump is automatically stopped and the selected valve is closed, achieving comprehensive monitoring of the cables in the cable trench and realizing the effect of comprehensive fire extinguishing coverage and timely fire extinguishing.

[0013] Optionally, the detection unit includes a temperature-sensing cable laid with dual sinusoidal waves. The temperature-sensing cable is buried in the cable trench along the length of the cable trench and detects the temperature in the cable trench and generates a temperature detection signal.

[0014] By adopting the above technical solution and using dual-channel sinusoidal wave laid temperature-sensing cables, a redundant temperature detection mechanism can be provided. In actual operation, if one of the temperature-sensing cables fails for some reason (such as physical damage, local faults, etc.), the other temperature-sensing cable can still work normally and continue to monitor the temperature in the cable trench. This redundancy design reduces the risk of failing to detect fire hazards in time due to detection unit failure. The sinusoidal wave laying method makes the distribution of temperature-sensing cables in the cable trench more uniform and reasonable. Compared with straight-line laying, sinusoidal wave laying can better cover different areas of the cable trench and reduce monitoring blind spots.

[0015] Optionally, the processing unit includes a zone control cabinet, which is fixed to the top of the cable trench. Multiple zone control cabinets are provided, with adjacent zone control cabinets spaced apart along the length of the cable trench. Each zone control cabinet includes an inverting comparator. The inverting input terminal ui of the inverting comparator is connected to the output terminal of the temperature sensing cable, and the non-inverting input terminal Uth of the inverting comparator receives a preset reference value. The inverting comparator responds to the temperature detection signal and compares the temperature detection signal with the preset value to output a temperature adjustment signal.

[0016] By adopting the above technical solution, the zone control cabinets are fixed at the top of the cable trench, and multiple zone control cabinets are spaced apart along the length of the cable trench. This distributed layout effectively manages different areas of the cable trench. Each zone control cabinet can process the temperature detection signal of its assigned area locally, avoiding attenuation and interference that may occur due to long signal transmission distances, thereby improving the efficiency and accuracy of signal processing. The inverting comparator plays a crucial signal comparison role in the zone control cabinet. Its inverting input is connected to the output of the temperature sensor (the temperature sensing cable can be regarded as a temperature sensor), and the non-inverting input is input with a preset reference value. Through this connection method, the inverting comparator can compare the temperature detection signal generated by the temperature sensing cable with the preset reference value (such as the fire alarm temperature threshold) in real time.

[0017] Optionally, the execution unit includes a controller, the input of which is connected to the output of an inverting comparator; the controller responds to a temperature comparison signal and outputs an execution signal, which controls the start and stop of the fire extinguishing control cabinet.

[0018] By adopting the above technical solution, the controller is connected to the output of the inverting comparator, realizing the key signal transmission from the temperature detection and comparison stage to the fire extinguishing control stage. The temperature comparison signal output by the inverting comparator reflects whether the temperature inside the cable trench is abnormal. After receiving this signal, the controller processes it according to its built-in logic program, thereby intelligently deciding whether to activate the fire extinguishing control cabinet based on the actual temperature conditions. This automated signal processing and linkage mechanism enables the entire cable trench fire extinguishing system to respond quickly to fire situations without manual intervention, greatly improving the timeliness and accuracy of fire extinguishing.

[0019] Optionally, adjacent partition control cabinets are spaced 50 meters apart.

[0020] By adopting the above technical solution, the zoned control cabinets distributed at 50-meter intervals, combined with the presence of fire-resistant zone modules, can ensure comprehensive monitoring coverage of the entire cable trench.

[0021] Optionally, it also includes fireproof walls, of which multiple fireproof walls are provided, with at least one fireproof wall between adjacent zone control cabinets, and the fireproof walls are fixed in the cable trench.

[0022] By adopting the above technical solutions, the fire-resistant sealing wall, as a physical fire barrier, can effectively block the spread of flames and high-temperature smoke within the cable trench. When a fire occurs in a certain zone, even if the fire is large, the fire-resistant sealing wall will confine the fire within its own zone, preventing the fire from spreading to adjacent zones, thereby reducing the scope of the fire's impact, protecting the equipment and cables in other zones, and reducing the overall loss caused by the fire.

[0023] Optionally, each of the partition control cabinets has two temperature sensing cables, and the two temperature sensing cables for a single partition control cabinet are laid out in parallel to each other.

[0024] By employing the above technical solution, two parallel temperature-sensing cables mutually verify the detected temperature data. When both cables simultaneously detect an abnormal temperature increase with consistent trends, it more accurately determines the existence of a fire risk within the cable trench, effectively reducing false alarms from a single sensing cable caused by environmental factors or localized interference. This mutual verification mechanism improves the accuracy and reliability of the entire temperature detection system, providing a more reliable basis for subsequent firefighting decisions.

[0025] Optionally, the base may be fixed with multiple casters.

[0026] By adopting the above technical solution, the omnidirectional wheels make it easy to adjust the position of the base according to the needs of the site.

[0027] In summary, this application includes at least one of the following beneficial technical effects:

[0028] 1. The fire compartment module detects the temperature of fires in the cable trench. When a fire occurs, it issues an alarm and activates the fire suppression control cabinet. The fire suppression control cabinet simultaneously sends activation commands to the sectional valves and zone valves on the main pipeline. Once the valves are activated normally, the high-pressure spray pump delivers perfluoroacetone to extinguish the fire in the cable trench. When the amount of extinguishing agent reaches the design requirements, the pump automatically stops and the selected valves are closed, achieving comprehensive monitoring of the cables in the cable trench and ensuring full coverage and timely fire suppression.

[0029] 2. The use of dual-channel sinusoidal wave laid temperature sensing cables provides a redundant temperature detection mechanism. In actual operation, if one of the sensing cables fails for some reason (such as physical damage, local faults, etc.), the other sensing cable can still operate normally and continue to monitor the temperature within the cable trench. This redundancy design reduces the risk of failing to detect fire hazards in a timely manner due to detection unit failure. The sinusoidal wave laying method makes the distribution of temperature sensing cables within the cable trench more uniform and reasonable. Compared with straight-line laying, sinusoidal wave laying can better cover different areas of the cable trench and reduce monitoring blind spots. Attached Figure Description

[0030] Figure 1 This is a structural schematic diagram of an embodiment of this application;

[0031] Figure 2 This is a schematic diagram of a fire compartment module;

[0032] Figure 3 This is the circuit diagram of an inverting comparator.

[0033] In the diagram, 1. Base; 11. Fire extinguishing control cabinet; 12. High-pressure spray pump; 13. Air pump; 14. Perfluoroethyl ketone (PFE) storage device; 2. Main pipeline; 21. Nozzle; 3. Casters; 4. Fire compartment module; 41. Detection unit; 411. Temperature sensing cable; 42. Processing unit; 421. Zone control cabinet; 43. Execution unit; 431. Controller; 5. Fireproof sealing wall. Detailed Implementation

[0034] The following is in conjunction with the appendix Figures 1-3 This application will be described in further detail.

[0035] This application discloses a cable trench fire extinguishing device.

[0036] refer to Figure 1 and Figure 2 A cable trench fire extinguishing device includes a base 1, on which a fire extinguishing control cabinet 11, a high-pressure spray pump 12, an air pump 13, a perfluoroacetone agent storage device 14, a main pipeline 2, a nozzle 21, a fireproof sealing wall 5, and a fire compartment module 4 are installed. The fire extinguishing control cabinet 11, the high-pressure spray pump 12, the air pump 13, and the perfluoroacetone agent storage device 14 are all fixed on the base 1, and casters 3 are provided at the bottom of the base 1.

[0037] refer to Figure 1 One end of the high-pressure spray pump 12 is connected to the interior of the perfluoroethyl ketone (PFE) agent storage device 14, and the other end is connected to the air pump 13. The outlet end of the air pump 13 is connected to one end of the main pipeline 2. The main pipeline 2 extends into the cable trench and is fixed to the vertical sidewall of the cable trench along its length. Multiple nozzles 21 are provided, with adjacent nozzles 21 spaced apart along the length of the cable trench on the main pipeline 2. The main pipeline 2 itself contains multiple sectional valves and zone valves.

[0038] refer to Figure 1 and Figure 2The fire compartment module 4 controls the start and stop of the fire extinguishing control cabinet 11. The fire compartment module 4 includes a detection unit 41, a processing unit 42, and an execution unit 43. The detection unit 41 includes a dual-channel sinusoidal temperature-sensing cable 411, laid along the length of the cable trench. The temperature-sensing cable 411 detects the temperature within the cable trench and generates a temperature detection signal. The thermistor in the temperature-sensing cable 411 changes its resistance or other physical properties with temperature changes. This change in resistance is converted into a continuously changing voltage or current signal, i.e., an analog signal, through a circuit. Alternatively, the temperature-sensing cable 411 system has a built-in analog-to-digital converter (ADC) that converts the analog signal generated by the thermistor into a digital signal. The digital signal is discrete and represented by binary encoding. Both methods enable the temperature-sensing cable 411 to detect the temperature within the cable trench and generate a temperature detection signal.

[0039] refer to Figure 1 and Figure 2 The processing unit 42 includes a zone control cabinet 421, which is fixed to the top of the cable trench. Multiple zone control cabinets 421 are provided, with adjacent zone control cabinets 421 spaced apart along the length of the cable trench, with a spacing of 50 meters between adjacent zone control cabinets. Multiple fire-resistant walls 5 are provided, with at least one fire-resistant wall 5 between adjacent zone control cabinets 421. The fire-resistant walls 5 are fixed inside the cable trench, separating the space on both sides along the length of the cable trench. Each zone control cabinet 421 corresponds to two temperature-sensing cables 411, which are arranged parallel to each other within the cable trench.

[0040] refer to Figure 2 and Figure 3 The partition control cabinet 421 includes an inverting comparator; the inverting input terminal ui of the inverting comparator is connected to the output terminal of the temperature sensing cable 411, and the non-inverting input terminal Uth of the inverting comparator receives a preset reference value; the inverting comparator responds to the temperature detection signal and compares the temperature detection signal with the preset value to output a temperature adjustment signal. The output terminal of the inverting comparator is connected to the execution unit 43. The inverting input terminal ui of the inverting comparator is connected to the output terminal of the temperature sensing cable 411 and receives the analog signal of the temperature value detection. The inverting comparator converts the analog signal into a digital signal and compares it with the preset temperature value to determine the magnitude of the value detected by the temperature sensing cable 411 and the preset value. When the value detected by the temperature sensing cable 411 is greater than the preset value, the output terminal of the inverting comparator will transmit a low level; when the value detected by the temperature sensing cable 411 is less than the preset value, the output terminal of the inverting comparator will transmit a high level. The subsequent execution unit 43 responds differently based on the different levels transmitted by the inverting comparator, thereby achieving the effect of conveniently processing and judging different temperatures.

[0041] refer to Figure 3 An inverting comparator works by comparing the input voltage (ui) with a reference voltage (Uth). When the input voltage (ui) is greater than the reference voltage (Uth), the operational amplifier's output voltage (u0) is low (typically close to the negative voltage of the power supply). When the input voltage (ui) is less than the reference voltage (Uth), the operational amplifier's output voltage (u0) is high (typically close to the positive voltage of the power supply).

[0042] refer to Figure 1 and Figure 2 The execution unit 43 includes a controller 431, the input of which is connected to the output of an inverting comparator. The controller 431 controls the fire extinguishing control cabinet 11 differently according to the different output levels of the inverting comparator. When the controller 431 receives a low level, the fire extinguishing control cabinet 11 responds to the controller 431 by issuing start commands to the sectional valves and zone valves included on the main pipeline 2. After the valves start normally, the high-pressure spray pump 12 is linked to deliver perfluoroacetone agent to extinguish the fire in the cable trench. When the amount of extinguishing agent reaches the design requirements, the pump is automatically stopped and the selected valve is closed. When the controller 431 receives a high level, the corresponding controller 431 of the fire extinguishing control cabinet 11 does not trigger any start commands.

[0043] The implementation principle of the cable trench fire extinguishing device in this application embodiment is as follows: The detection unit 41 detects the temperature in the cable trench and transmits the detected temperature to the processing unit 42 in the form of a digital signal or analog signal. The processing unit 42 compares the transmitted temperature value with the preset temperature value. When the temperature value is greater than the preset value, a low level is transmitted; when the temperature value is less than the preset value, a high level is transmitted. Finally, when the execution unit 43 receives the low level, it starts the fire extinguishing control cabinet 11. The fire extinguishing control cabinet 11 simultaneously sends start commands to the sectional valves and zone valves included on the main pipeline 2. After the valves start normally, the high-pressure spray pump 12 is linked to deliver perfluoroacetone agent to extinguish the fire in the cable trench. When the amount of extinguishing agent reaches the design requirements, the pump is automatically stopped and the selected valve is closed, so as to achieve comprehensive monitoring of the cables in the cable trench and realize the effect of comprehensive coverage of the fire extinguishing range and timely fire extinguishing.

[0044] The embodiments described in this specific implementation are preferred embodiments of this application and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A cable trench fire extinguishing device, comprising a base (1), on which a fire extinguishing control cabinet (11), a high-pressure spray pump (12), an air pump (13), and a perfluoroacetone agent storage device (14) are fixed, characterized in that: It also includes a main pipe (2), nozzles (21) and a fire compartment module (4) for controlling the start and stop of the fire extinguishing control cabinet (11). One end of the high-pressure spray pump (12) is connected to the inside of the perfluoroethyl ketone agent storage device (14), and the other end is connected to the air pump (13). The outlet end of the air pump (13) is connected to one end of the main pipe (2). The main pipe (2) is laid on the vertical side wall of the cable trench along the length of the cable trench. Multiple nozzles (21) are provided, and adjacent nozzles (21) are arranged at intervals on the main pipe (2) along the length of the cable trench. Fire compartment module (4) includes: The detection unit (41) is buried in the cable trench and is used to detect the temperature in the cable trench and output a temperature detection signal; The processing unit (42) is connected to the output of the detection unit (41) and receives the temperature detection signal. It compares the temperature detection signal with the preset reference value and outputs the temperature adjustment signal. The execution unit (43) is connected to the processing unit (42) and receives the temperature adjustment signal. The execution unit (43) outputs an execution signal according to the temperature adjustment signal to control the fire extinguishing control cabinet (11) to start and stop.

2. The cable trench fire extinguishing device according to claim 1, characterized in that: The detection unit (41) includes a temperature sensing cable (411) laid with dual sinusoidal waves. The temperature sensing cable (411) is buried in the cable trench along the length of the cable trench. The temperature sensing cable (411) detects the temperature in the cable trench and generates a temperature detection signal.

3. A cable trench fire extinguishing device according to claim 2, characterized in that: The processing unit (42) includes a partition control cabinet (421), which is fixed on the top of the cable trench. Multiple partition control cabinets (421) are provided, and adjacent partition control cabinets (421) are arranged at intervals along the length of the cable trench. Each partition control cabinet (421) includes an inverting comparator. The inverting input terminal ui of the inverting comparator is connected to the output terminal of the temperature sensing cable (411), and the non-inverting input terminal Uth of the inverting comparator is input with a preset reference value; The inverting comparator responds to the temperature detection signal and compares the temperature detection signal with a preset value to output a temperature adjustment signal.

4. A cable trench fire extinguishing device according to claim 3, characterized in that: The execution unit (43) includes a controller (431), the input of which is connected to the output of an inverting comparator; the controller (431) responds to the temperature comparison signal and outputs an execution signal, which controls the fire extinguishing control cabinet (11) to start and stop.

5. A cable trench fire extinguishing device according to claim 3, characterized in that: The adjacent partition control cabinets (421) are set at intervals of 50 meters.

6. A cable trench fire extinguishing device according to claim 5, characterized in that: It also includes fireproof sealing walls (5), and multiple fireproof sealing walls (5) are provided. There is at least one fireproof sealing wall (5) between adjacent partition control cabinets (421). The fireproof sealing walls (5) are fixed in the cable trench.

7. A cable trench fire extinguishing device according to claim 5, characterized in that: The number of temperature sensing cables (411) corresponding to each of the partition control cabinets (421) is 2, and the two temperature sensing cables (411) corresponding to a single partition control cabinet (421) are arranged in parallel to each other.

8. A cable trench fire extinguishing device according to claim 1, characterized in that: The base (1) has multiple casters (3) fixed to its bottom.

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