Cable trench fire extinguishing device and cable trench fire extinguishing system

Abstract

The utility model discloses a cable trench fire extinguishing device and a cable trench fire extinguishing system, and the cable trench fire extinguishing device comprises a fire extinguishing agent container, a fire detection tube, an alarm device and a pressure gauge, the fire extinguishing agent container is installed in a cable trench and used for storing a fire extinguishing agent and driving gas, and a bottle opening of the fire extinguishing agent container is sealed through a bottle head valve. The head end of the fire detection tube is connected with the bottle head valve, the tail end of the fire detection tube extends into a cable trench and is mounted above a cable along a cable laying path, and a temperature blasting threshold value is set on the tube wall of the fire detection tube; the alarm device is electrically connected with the bottle head valve and is used for sending out a sound-light alarm signal when the bottle head valve acts; and the pressure gauge is arranged at the tail end of the fire detection tube and is used for detecting the pressure change of the system. According to the technical scheme, the fire extinguishing efficiency of the cable trench can be improved.

Description

Technical Field

[0001] This utility model relates to the field of fire protection equipment technology, and in particular to a cable trench fire extinguishing device and a cable trench fire extinguishing system. Background Technology

[0002] Cable trenches, as a crucial component of infrastructure for power, communications, and municipal services, involve multi-departmental management. However, the lack of robust cross-departmental collaboration mechanisms leads to delays in addressing potential hazards. For instance, the long-standing problem of shared power and communication cables in old urban areas persists without unified management. Cable trenches are characterized by dense cable laying, damp environments, and poor ventilation, making them highly susceptible to fires due to cable aging and short circuits. Traditional firefighting methods struggle to meet the fire protection needs of cable trenches. For example, smoke detectors are unresponsive during the smoldering stage of cables, while heat detectors are easily affected by the dampness and dust within the trench, leading to false alarms or missed alarms. The long, narrow, and branching structure of cable trenches limits the coverage of traditional point-type detectors, making it difficult to accurately locate the fire source. The vertical continuity of cable trenches allows high-temperature smoke to spread rapidly through unsealed openings during a fire, resulting in rapid fire spread and three-dimensional combustion, significantly increasing the difficulty of firefighting. Furthermore, cable trench fires are often electrical fires, making traditional water-based fire suppression systems unsuitable for this scenario. Utility Model Content

[0003] The main purpose of this invention is to provide a fire extinguishing device for cable trenches, which aims to improve the fire extinguishing efficiency for cable trenches.

[0004] To achieve the above objectives, the present invention proposes a cable trench fire extinguishing device, comprising:

[0005] A fire extinguishing agent container is installed in a cable trench. The fire extinguishing agent container is used to store fire extinguishing agent and propellant gas. The mouth of the fire extinguishing agent container is sealed by a bottle head valve.

[0006] A fire detection tube, the first end of which is connected to the bottle head valve, and the end of which extends into the cable trench and is installed above the cable along the cable laying path. A temperature burst threshold is set on the tube wall.

[0007] An alarm device, electrically connected to the bottle head valve, is used to emit an audible and visual alarm signal when the bottle head valve is activated; and

[0008] A pressure gauge is installed at the end of the fire detection tube to detect changes in system pressure.

[0009] Optionally, the bottle head valve can be detachably connected to multiple fire detection tubes via partition joints, with each fire detection tube corresponding to an independent partition of the cable trench, thereby achieving partition protection for multi-branch cable trenches.

[0010] Optionally, the partition connector is a tee or multi-way structure, connected to the bottle head valve interface by threads, and the length of each branch fire detection pipe is adapted according to the partition distance of the cable trench.

[0011] Optionally, the extinguishing agent is perfluorohexanone, and the driving gas is high-purity nitrogen.

[0012] Optionally, the extinguishing agent container supports floor mounting and is equipped with a wall-mounted bracket.

[0013] Optionally, the alarm device is a passive audible and visual alarm, which is triggered by the mechanical action of the bottle head valve to activate the circuit, requiring no external power supply.

[0014] Optionally, the pressure gauge is a shock-resistant pointer pressure gauge with a dial scale range covering the system's working pressure range, facilitating quick determination of the system status during maintenance.

[0015] A cable trench fire extinguishing system includes the cable trench fire extinguishing device as described above. Multiple sets of cable trench fire extinguishing devices are arranged in sections along a long cable trench, and each set of cable trench fire extinguishing devices is independently controlled through a partition joint.

[0016] This utility model's technical solution organically combines an extinguishing agent container, a fire detection tube, an alarm device, and a pressure gauge to construct an integrated and efficient fire extinguishing system. The fire detection tube serves both fire detection and extinguishing agent delivery functions, accurately sensing temperature changes in the cable trench. Upon reaching the burst threshold, it triggers the cylinder valve, rapidly releasing the extinguishing agent under the action of driving gas. Simultaneously, the alarm device emits audible and visual alarms, and the pressure gauge monitors the system pressure in real time, integrating temperature detection, automatic fire extinguishing, status monitoring, and alarm notification functions. This solution has a simple structure, eliminating the need for independent detection lines and complex pipelines. Multi-branch cable trench protection can be achieved through partitioned joints to reduce protection costs. Localized protection through precise, targeted spraying improves fire extinguishing efficiency. The modular design adapts to the segmented layout requirements of long-distance cable trenches. Its high degree of automation enables multi-branch cable trench fire monitoring and early-stage automatic fire suppression, effectively improving the timeliness and reliability of fire prevention and control, and reducing the risk of loss. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the structure of an embodiment of the cable trench fire extinguishing device of this utility model;

[0019] Figure 2 for Figure 1 A schematic diagram of the structure at the valve of the middle bottle.

[0020] Explanation of reference numerals: 1. Extinguishing agent container; 2. Bottle valve; 3. Fire detection tube; 4. Alarm device; 5. Pressure gauge; 21. Zone connector

[0021] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0024] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the meaning of "and / or" throughout the text is to include three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution that simultaneously satisfies A and B. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0025] This utility model proposes a fire extinguishing device for cable trenches.

[0026] In the embodiments of this utility model, such as Figure 1 and Figure 2As shown, the cable trench fire extinguishing device includes an extinguishing agent container 1, a fire detection tube 3, an alarm device 4, and a pressure gauge 5. The extinguishing agent container 1 is installed in the cable trench and is used to store the extinguishing agent and propellant gas. The mouth of the extinguishing agent container 1 is sealed by a bottle head valve 2. The first end of the fire detection tube 3 is connected to the bottle head valve 2, and the last end extends into the cable trench and is installed above the cable along the cable laying path. A temperature burst threshold is set on the tube wall. The alarm device 4 is electrically connected to the bottle head valve 2 and is used to emit an audible and visual alarm signal when the bottle head valve 2 is activated. The pressure gauge 5 is installed at the end of the fire detection tube 3 and is used to detect changes in system pressure.

[0027] Specifically, when the temperature inside the cable trench rises to the temperature burst threshold set on the wall of the fire detection pipe 3 due to fire hazard, the corresponding position at the end of the fire detection pipe 3 along the cable laying path will rupture due to the temperature reaching the threshold. At this time, the cylinder valve 2 connected to the beginning of the fire detection pipe 3 is triggered and opened. The extinguishing agent stored in the extinguishing agent container 1 is rapidly sprayed into the fire area above the cable through the rupture point of the fire detection pipe 3 under the action of the driving gas, achieving initial suppression of the fire. At the same time, the alarm device 4 electrically connected to the cylinder valve 2 immediately activates, emitting an audible and visual alarm signal to remind relevant personnel to take further measures in a timely manner. The pressure gauge 5 installed at the end of the fire detection pipe 3 will monitor the system pressure changes in real time. When the fire detection pipe 3 ruptures and the cylinder valve 2 opens, causing the system pressure to drop, the change in the reading of the pressure gauge 5 can serve as an important basis for judging whether the device has been activated and the system operating status, thus forming a complete fire extinguishing process integrating temperature detection, fire extinguishing release, status monitoring, and alarm prompts.

[0028] This utility model's technical solution organically combines an extinguishing agent container 1, a fire detection tube 3, an alarm device 4, and a pressure gauge 5 to construct an integrated and efficient fire extinguishing system. The fire detection tube 3 has both fire detection and extinguishing agent delivery functions, accurately sensing temperature changes in the cable trench. Upon reaching the burst threshold, it triggers the cylinder valve 2, rapidly releasing the extinguishing agent under the action of driving gas. Simultaneously, the alarm device 4 emits an audible and visual alarm, and the pressure gauge 5 monitors the system pressure in real time, achieving integrated functions of temperature detection, automatic fire extinguishing, status monitoring, and alarm notification. This solution has a simple structure, eliminating the need for independent detection lines and complex pipelines. The partitioned connector 21 enables protection of multi-branch cable trenches to reduce protection costs. Localized protection through precise spraying improves fire extinguishing efficiency. The modular design adapts to the segmented layout requirements of long-distance cable trenches. The highly automated characteristics enable fire monitoring of multi-branch cable trenches and automatic early fire suppression, effectively improving the timeliness and reliability of fire prevention and control and reducing the risk of loss.

[0029] In some embodiments, the cylinder valve 2 is detachably connected to multiple fire detection tubes 3 via partition connectors 21. Each fire detection tube 3 corresponds to an independent partition of the cable trench, achieving partitioned protection for multi-branch cable trenches. Specifically, the multiple fire detection tubes 3 correspond to independent partitions of the cable trench, enabling partitioned fire identification. When the temperature of a partition reaches the burst threshold of a fire detection tube 3, only the fire detection tube 3 in that partition ruptures, triggering the cylinder valve 2 to release the extinguishing agent, precisely extinguishing the fire. This avoids the resource waste caused by full-area fire suppression and prevents secondary disasters such as cable short circuits caused by extinguishing agent spraying in non-fired areas, greatly improving fire suppression efficiency and accuracy, and controlling the fire to a minimum.

[0030] In some embodiments, the partition connector 21 is a tee or multi-way structure, connected to the cylinder valve 2 interface via threads, and the length of each branch fire detection pipe 3 is adapted according to the partition distance of the cable trench. Specifically, the threaded tee or multi-way partition connector 21 can tightly connect to the cylinder valve 2 interface, effectively reducing the risk of loosening or falling off due to vibration or pressure fluctuations compared to snap-fit ​​connections. A stable connection ensures that the extinguishing agent will not reduce its extinguishing efficiency due to leakage during release, ensuring that each partition fire detection pipe 3 can normally receive the extinguishing agent released by the cylinder valve 2 during a fire, thus improving the reliability and stability of the entire fire extinguishing system.

[0031] In some embodiments, the extinguishing agent is perfluorohexanone, and the propellant gas is high-purity nitrogen. Specifically, perfluorohexanone has excellent fire extinguishing performance and extremely high fire extinguishing efficiency. It can suppress the combustion chain reaction in a very short time and quickly extinguish fires in cable trenches. Moreover, the extinguishing concentration of perfluorohexanone is low, requiring only a small amount to achieve the extinguishing effect. It can quickly suppress the fire, reduce cable damage caused by fire, and reduce power outage time and economic losses caused by cable faults in the power system.

[0032] In some embodiments, the extinguishing agent container 1 supports floor-mounted installation and is equipped with a wall-mounted bracket. Specifically, floor-mounted installation is suitable for areas with relatively open space and flat ground within cable trenches, requiring no additional wall support. The installation process is simple, and the extinguishing agent container 1 can be directly placed and fixed in the designated location. The wall-mounted bracket, on the other hand, is suitable for cable trench scenarios where space is limited, the ground is unsuitable for equipment placement, or where floor space needs to be saved, allowing the container to be mounted on a wall. The combination of these two installation methods allows the fire extinguishing device to flexibly select the appropriate installation method based on the actual layout, spatial structure, and construction conditions of the cable trench, greatly expanding the applicability of the fire extinguishing device and meeting the needs of different cable trench projects.

[0033] In some embodiments, the alarm device 4 is a passive audible and visual alarm, which is triggered by the mechanical action of the bottle head valve 2 to conduct the circuit, requiring no external power supply. Specifically, the passive audible and visual alarm does not require an external power supply, completely eliminating the risk of failing to alarm due to power supply interruptions (such as damage to the circuit in the cable trench caused by a fire, power outages, etc.). As long as the bottle head valve 2 undergoes mechanical action due to the rupture of the fire detection tube 3, it can immediately trigger the circuit to conduct, causing the alarm to emit audible and visual signals. This design ensures that the alarm device 4 can still operate stably in the most severe fire environments, promptly transmitting fire information to the outside world and buying valuable time for subsequent rescue efforts.

[0034] In some embodiments, pressure gauge 5 is a shock-resistant pointer pressure gauge 5, with a dial scale covering the system's operating pressure range, facilitating quick assessment of the system status during maintenance. Specifically, cable trenches contain dynamic interferences such as equipment operating vibrations and personnel impacts. Ordinary pressure gauges 5 are prone to pointer jitter and internal mechanical damage due to vibration, resulting in reading errors or malfunctions. The shock-resistant pointer pressure gauge 5, through anti-vibration designs such as liquid-filled damping and reinforced mechanism, effectively filters vibration interference, ensuring stable display of system pressure under complex cable trench conditions.

[0035] A cable trench fire extinguishing system includes multiple cable trench fire extinguishing devices as described above. The multiple sets of cable trench fire extinguishing devices are arranged in sections along a long cable trench, and each set of cable trench fire extinguishing devices is independently controlled through a partition joint 21.

[0036] This modular design allows for the segmented arrangement of multiple fire detection tubes 3 and fire extinguishing containers, adapting to long-distance cable trenches. Compared to traditional large-scale pipe network fire extinguishing systems that use centralized storage tanks and complex piping, the segmented, zoned approach eliminates the need for long-distance pipe network laying, reducing procurement and installation costs. Furthermore, the zone joints 21 utilize threaded connections, simplifying construction and shortening the on-site installation cycle. This design is particularly suitable for scenarios such as power tunnels, industrial park cable trenches, and rail transit cable corridors.

[0037] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made under the inventive concept of the present utility model using the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A cable trench fire extinguishing device, characterized in that, include A fire extinguishing agent container is installed in a cable trench. The fire extinguishing agent container is used to store fire extinguishing agent and propellant gas. The mouth of the fire extinguishing agent container is sealed by a bottle head valve. A fire detection tube, the first end of which is connected to the bottle head valve, and the end of which extends into the cable trench and is installed above the cable along the cable laying path. The tube wall is provided with a temperature burst threshold. An alarm device, electrically connected to the bottle head valve, is used to emit an audible and visual alarm signal when the bottle head valve is activated; and A pressure gauge is installed at the end of the fire detection tube to detect changes in system pressure.

2. The cable trench fire extinguishing device as described in claim 1, characterized in that, The bottle head valve is detachably connected to multiple fire detection tubes via partition connectors. Each fire detection tube corresponds to an independent partition of the cable trench, thereby achieving partition protection for multi-branch cable trenches.

3. The cable trench fire extinguishing device as described in claim 2, characterized in that, The partition connector is a three-way or multi-way structure, which is connected to the bottle head valve interface by threads. The length of the fire detection tube in each branch is adapted according to the partition distance of the cable trench.

4. The cable trench fire extinguishing device as described in claim 1, characterized in that, The extinguishing agent is perfluorohexanone, and the driving gas is high-purity nitrogen.

5. The cable trench fire extinguishing device as described in claim 1, characterized in that, The extinguishing agent container supports floor installation and is equipped with a wall-mounted bracket.

6. The cable trench fire extinguishing device as described in claim 1, characterized in that, The alarm device is a passive audible and visual alarm, which is triggered by the mechanical action of the bottle head valve to activate the circuit and does not require an external power source.

7. The cable trench fire extinguishing device as described in claim 1, characterized in that, The pressure gauge is a shock-resistant pointer pressure gauge with a dial scale range covering the system's working pressure range, facilitating quick assessment of the system status during maintenance.

8. A cable trench fire extinguishing system, comprising a plurality of cable trench fire extinguishing devices as described in any one of claims 1 to 7, characterized in that, Multiple sets of the cable trench fire extinguishing devices are arranged in sections along a long cable trench, and each set of the cable trench fire extinguishing devices is independently controlled through a zone joint.

Images