A fire alarm system for underground pipe gallery cable trench and its working method

Abstract

The present invention relates to the field of alarm and fire extinguishing technology, and provides a fire alarm system for underground pipe gallery cable trench and a working method thereof, comprising a controller, a sensor, an igniter, an alarm device, a transverse thermal wire, a longitudinal thermal wire, a plurality of fire extinguishing core installation shells arranged along the cable direction, a fire extinguishing core arranged in the fire extinguishing core installation shell, and a temperature-sensitive neural network arranged on the cable trench wall; the transverse thermal wire, the longitudinal thermal wire and the temperature-sensitive neural network all spontaneously ignite when the temperature in the cable trench exceeds a threshold value; the ignition head of the igniter is connected to the longitudinal thermal wire or the transverse thermal wire; the sensor is arranged directly above the fire extinguishing core installation shell for collecting fire signals; the controller and the alarm device are arranged outside the cable trench; the fire extinguishing core installation shell is provided with a plurality of jet holes for ejecting the gas generated after the fire extinguishing core is ignited out of the fire extinguishing core installation shell. It can not only protect the equipment, but also extinguish the fire in the shortest time.

Description

Technical Field

[0001] The invention relates to the technical field of alarm and fire extinguishing, and in particular to a fire alarm system for underground pipe gallery cable trenches and a working method thereof. Background Art

[0002] The statements in this section merely provide background art related to the present invention and do not necessarily constitute prior art.

[0003] The underground cable trench is a long and narrow enclosed space where a large number of cables and wires are concentrated. Due to the characteristics of power equipment and cables, there are certain fire hazards. The following are the existing fire hazards: long-term use or aging of wires may cause short circuits in the wires, causing fires; overload, short circuit or other failures of power equipment may cause fires; overload or poor contact of wires or cables may cause heating, accumulation of heat and thus cause fires; external fire sources (such as fires in adjacent buildings or direct contact with flames) may cause fires in cable trenches and corridors.

[0004] The cable trenches in the utility corridors are usually covered by covers, and the space is small and difficult for personnel to enter, so traditional fire-fighting methods seem to be inadequate.

[0005] Existing cable trench fire alarm systems, such as the patent with publication number CN115228012A, entitled "A Type of Alarm Fire Prevention Device for Substation Cable Trench", place controllers, sensors, etc. in the cable trench, which are easily damaged in a fire; existing cable trench alarm fire extinguishing systems, such as the patent with publication number CN115738131B, entitled "A Type of Cable Trench Smoke Fire Extinguishing Device Convenient to Assemble", use dry powder, but due to the high temperature of cable combustion, it is impossible to prevent re-ignition; existing cable trench fire alarm systems, such as the patent with publication number CN113047468A, entitled "A Type of Cable Trench Fire Wall and Construction Method Thereof", use liquid non-flammable gas, which requires the design of precise storage devices and injection devices, has low feasibility, and is bulky, making it unsuitable for use in narrow and long pipe galleries, and after a fire, it takes a long time to start, which prolongs the fire extinguishing time.

[0006] In summary, the existing cable trench fire alarm system has the following defects: controllers, sensors and other equipment are installed in the cable trench and are easily damaged in a fire; due to the high temperature of cable combustion, the use of dry powder fire extinguishing cannot prevent re-ignition; precise storage devices and injection devices are required, which are bulky and costly; most importantly, the narrow and long pipe corridor makes it difficult for fire extinguishing devices to fully cover the entire area, and after a fire occurs, it takes a long time to start, which prolongs the fire extinguishing time. Summary of the invention

[0007] In order to address the deficiencies in the prior art, the present invention provides a fire alarm system for an underground pipe gallery cable trench and a working method thereof. A controller and an alarm device are arranged outside the cable trench, which not only enables the staff to promptly discover the alarm signal, but also protects the controller and the alarm device under fire. A sensor is arranged on the top of the fire extinguishing core to protect the sensor. Moreover, through the arrangement of horizontal thermistor wires, longitudinal thermistor wires and temperature-sensing neural networks, even in a narrow and long pipe gallery, a rapid response can be made when a fire occurs, and the fire can be extinguished in the shortest time.

[0008] In order to achieve the above object, the present invention adopts the following technical solution:

[0009] A first aspect of the present invention provides a fire alarm system for an underground utility corridor cable trench.

[0010] A fire alarm system for underground pipe gallery cable trenches, comprising: a controller, a sensor, an igniter, an alarm device, a transverse thermal wire, a longitudinal thermal wire, a plurality of fire extinguishing core installation shells arranged along the cable direction, a fire extinguishing core arranged in the fire extinguishing core installation shell, and a temperature sensing neural network composed of thermal wires arranged on the cable trench wall;

[0011] The longitudinal thermal wire is used to connect the fire extinguishing core; the transverse thermal wire is used to connect the longitudinal thermal wire and the temperature sensing neural network; the transverse thermal wire, the longitudinal thermal wire and the temperature sensing neural network all spontaneously ignite when the temperature in the cable trench exceeds a threshold value;

[0012] The ignition head of the igniter is connected to the longitudinal thermal wire or the transverse thermal wire; the sensor is arranged just above the fire extinguishing core installation shell, and the sensor is used to collect fire signals; the controller and the alarm device are arranged outside the cable trench, and the controller is used to control the alarm device to alarm after receiving the fire signal from the sensor, and control the igniter to ignite;

[0013] The fire extinguishing core installation shell is provided with a plurality of jet holes, and the jet holes are used to eject the gas generated after the fire extinguishing core is ignited out of the fire extinguishing core installation shell.

[0014] Furthermore, the number of fire extinguishing core installation shells set in each protection area of ​​the underground pipeline corridor cable trench is determined by the whale optimization algorithm with the maximum gas injection distance as the goal.

[0015] Furthermore, the fire extinguishing core adopts potassium oxide fire extinguishing agent.

[0016] Furthermore, the transverse thermosensitive wire and the longitudinal thermosensitive wire are both arranged in a thermosensitive wire installation housing, and the thermosensitive wire installation housing is an aluminum tube.

[0017] Furthermore, it also includes a mounting shell, the mounting shell includes a pillar, a bottom plate, a support column and a top plate;

[0018] The bottom end of the pillar is inserted into the ground, the top end of the pillar is fixedly connected to the bottom surface of the base plate, one support column is fixed to each of the four corners of the base plate, and the base plate is fixed to the bottom end of the support column, the top plate is arranged at the top end of the support column, and the alarm device and the controller are placed on the base plate.

[0019] Furthermore, the design steps of the temperature-sensing neural network include: for each side wall of the cable trench, it is divided into several grids, the grids in contact with the horizontal thermal-sensitive line are taken as fixed points, and the goal is to select the least number of grids and the largest coverage area of ​​the selected grids, and a multi-objective optimization algorithm is used to select several grids other than the fixed points as mobile points, and the thermal-sensitive lines are laid out with the shortest connecting lines between all fixed points and mobile points to obtain the temperature-sensing neural network.

[0020] Furthermore, the coverage area is the sum of the radiation areas of the fixed point and the mobile point, and the radiation area is the area of ​​a circle with the fixed point or the mobile point as the center and a set value as the radius.

[0021] Furthermore, it also includes a power supply module arranged outside the cable trench, and the power supply module is used to supply power to the controller, sensor, igniter and alarm device.

[0022] Furthermore, it also includes a supporting device, which includes a base, a supporting rod and a mounting seat;

[0023] The bottom end of the support rod is connected to the base, and the base is buried in the bottom of the cable trench. The top end of the support rod is fixedly connected to the mounting seat, and the mounting seat has a first mounting hole along the cable laying direction. The first mounting hole is used for the fire extinguishing core mounting shell or the longitudinal thermal sensitive wire to pass through.

[0024] Furthermore, the mounting seat defines a second mounting hole perpendicular to the first mounting hole, and the second mounting hole is used for the passage of a transverse thermal line.

[0025] The second aspect of the present invention provides a working method of a fire alarm system for an underground pipe gallery cable trench as described in the first aspect, comprising the following steps:

[0026] When the temperature in the cable trench exceeds the threshold, the transverse thermal wire, longitudinal thermal wire or temperature-sensing neural network will spontaneously ignite;

[0027] The sensor collects fire signals. After receiving the fire signals from the sensors, the controller controls the alarm device to give an alarm and controls the igniter to ignite.

[0028] The gas generated after the fire extinguishing core is ignited is ejected out of the fire extinguishing core installation shell through the jet hole.

[0029] Compared with the prior art, the present invention has the following beneficial effects:

[0030] 1. The fire alarm system for underground cable trenches of the present invention arranges the controller and the alarm device outside the cable trench, which not only enables the staff to find the alarm signal in time, but also protects the controller and the alarm device under fire; moreover, the sensor is arranged on the top of the fire extinguishing core, which can protect the sensor.

[0031] 2. The fire alarm system for underground cable trenches of the present invention can determine the number of fire extinguishing core installation shells, which can not only keep the gas pressure within a safe range, but also ensure that the gas is sprayed far enough to expand the fire extinguishing range as much as possible, and quickly and comprehensively cover the narrow and long corridors. 3. The fire alarm system for underground cable trenches of the present invention can respond quickly to fires even in narrow and long corridors through the layout of horizontal thermal wires, longitudinal thermal wires and temperature-sensing neural networks, and can extinguish fires in the shortest possible time.

[0032] 4. The fire alarm system for underground cable trenches in the present invention is designed with the goal of maximizing the coverage area and selecting the least number of grids. It can not only respond quickly when a fire occurs, but also save the use of thermistor wires, thereby fully covering the narrow and long corridors while saving costs.

[0033] 5. The fire alarm system for underground cable trenches in the utility model adopts potassium ion fire extinguishing agent, which can be realized without external sensors, power supply and operation, and can be started by pure physical temperature sensing without considering the type of fire. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments and descriptions of the present invention are used to explain the present invention and do not constitute improper limitations on the present invention.

[0035] Figure 1 This is an overall structural diagram of a fire alarm system for an underground pipe gallery cable trench according to Embodiment 1 of the present invention;

[0036] Figure 2 Schematic diagram of the longitudinal thermosensitive wire and the transverse thermosensitive wire of Example 1 of the present invention;

[0037] Figure 3 It is a schematic diagram of a fire extinguishing core installation shell according to Embodiment 1 of the present invention;

[0038] Figure 4 This is a schematic diagram of the grid division of Example 1 of the present invention. DETAILED DESCRIPTION

[0039] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0040] It should be noted that the following detailed descriptions are exemplary and are intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0041] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0042] In the present invention, terms such as "upper", "lower", "left", "right", "front", "back", "vertical", "horizontal", "side", "bottom", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are relational words determined only for the convenience of describing the structural relationships of the various parts or elements of the present invention, and do not specifically refer to any part or element in the present invention and should not be understood as limitations on the present invention.

[0043] In the present invention, terms such as "fixed connection", "connected", "connection", etc. should be understood in a broad sense, indicating that it can be fixedly connected, integrally connected or detachably connected; it can be directly connected or indirectly connected through an intermediate medium. Relevant scientific research or technical personnel in this field can determine the specific meanings of the above terms in the present invention according to specific circumstances, and they should not be understood as limiting the present invention.

[0044] In the absence of conflict, the embodiments of the present invention and the features of the embodiments may be combined with each other.

[0045] Example 1

[0046] Embodiment 1 of the present invention provides a fire alarm system for an underground utility corridor cable trench.

[0047] The cable trench of the underground pipe gallery is a confined space with a partition wall every tens of meters. Each section of the space serves as a protection area. The fire alarm system for the underground pipe gallery cable trench in each protection area is installed independently and is not connected to the adjacent fire alarm system for the underground pipe gallery cable trench.

[0048] The present embodiment provides a fire alarm system for an underground pipe gallery cable trench, comprising: a fire extinguishing core, a thermistor 1 (including a longitudinal thermistor and a transverse thermistor), a fire extinguishing core mounting shell 2, a thermistor mounting shell, a sensor, a supporting device 3, an igniter, a mounting shell 4, a controller, an alarm device, a remote terminal, a power supply module, and a temperature sensing neural network composed of thermistor wires arranged on the wall of the cable trench.

[0049] The longitudinal thermal line is used to connect the fire extinguishing cores between different fire extinguishing core installation shells and the different fire extinguishing cores in the same fire extinguishing core installation shell.

[0050] The alarm device, power supply module, mounting housing 4 and controller are installed on the ground. Figure 1 As shown, the installation housing 4 includes a pillar, a bottom plate, a support column and a top plate. The bottom end of the pillar is inserted into the ground, the top end of the pillar is fixedly connected to the bottom surface of the bottom plate, a support column is fixed to each of the four corners of the bottom plate, and is fixed to the bottom end of the support column. The top plate is arranged on the top of the support column to prevent rain and sun. The alarm device, power supply module and controller are placed on the bottom plate in the installation housing 4.

[0051] The supporting device 3 is arranged in the cable trench of the underground pipe gallery. Figure 1 As shown, the support device 3 is arranged on one side of the cable support: the cable support in the cable trench of the underground pipe gallery is usually arranged on both sides or one side. If the cable support is arranged on both sides, the support device 3 is arranged in the middle of the cable trench. If the cable support is arranged on only one side, the support device 3 is arranged on the other side of the cable trench. The support device 3 includes a base, a support rod and a mounting seat. The bottom end of the support rod is connected to the base, and the base is buried in the bottom of the cable trench. The top end of the support rod is fixedly connected to the mounting seat. The mounting seat has a first mounting hole along the cable laying direction for the fire extinguishing core mounting shell 2 or the thermal line mounting shell (longitudinal thermal line) to pass through. The middle of the fire extinguishing core mounting shell 2 or the thermal line mounting shell is arranged at the mounting seat. If the fire extinguishing core mounting shell 2 is arranged on the supporting device 3, the sensor is placed on the top of the mounting seat; if the thermal wire mounting shell is arranged on the supporting device 3, the igniter is arranged on the top or inside of the mounting seat. If the thermal wire mounting shell is arranged on the supporting device 3, a second mounting hole perpendicular to the first mounting hole is also opened for the passage of the transverse thermal wire, that is, the igniter is arranged directly above the intersection of the longitudinal thermal wire and the transverse thermal wire.

[0052] The igniter and sensor are connected to the controller through signal lines and to the power supply module through power lines. The power lines or signal lines of the igniter and sensor are connected to the controller or power supply module through line pipes. The line pipes can be made of high temperature resistant materials. Figure 1As shown, one end of the line pipe is arranged on the support device 3, so that the power line or signal line is connected to the igniter or sensor; the other end of the line pipe extends from the bottom to the top of the installation shell 4, so that the power line or signal line is connected to the controller or power supply module. The line pipe passes through the cable trench, and the part in the cable trench, the end close to the support device 3 is higher than the end close to the installation shell 4, to prevent rainwater from entering the cable trench.

[0053] The sensor may be a smoke sensor or a temperature sensor, which transmits the smoke signal or temperature signal (i.e., fire signal) to the controller, which determines whether a fire occurs in the cable trench based on the smoke signal or temperature signal. If a fire occurs, the alarm device is controlled to sound an alarm, and the alarm signal is uploaded to the remote terminal through the 5G network of the Internet of Things technology, so that the fire situation can be learned in the first place. If a fire occurs, the igniter is controlled to ignite, and the ignition head of the igniter is connected to the thermistor (longitudinal thermistor and transverse thermistor) in the thermistor installation housing to ignite the thermistor.

[0054] The fire extinguishing core is a safe and non-toxic potassium ion fire extinguishing agent. Among them, the potassium ion fire extinguishing agent adopts the patent application number: 2023116834303, and the name is: A safe and non-toxic potassium oxide fire extinguishing agent preparation method. The patent discloses a safe and non-toxic potassium oxide fire extinguishing agent. The formula of the potassium ion fire extinguishing agent uses food-grade raw materials and is safe and harmless to the human body. The fire extinguishing principle of potassium ion fire extinguishing agent is: the ionic potassium oxide released by the combustion of potassium ion fire extinguishing agent has a universal uniform effect, achieving full flooding coverage of the entire protection area, combining with flame free radicals when contacting the fire source, repeatedly cutting off the flame free radical reaction chain, forming stable non-combustible products, and finally leading to the interruption of the flame chain, achieving the purpose of fire extinguishing without consuming the environmental oxygen content. The gas released by the potassium ion fire extinguishing agent can be suspended in the protected room or shell for at least 30 minutes, effectively and continuously suppressing the expansion or re-ignition of the fire. The safe and non-toxic potassium ion fire extinguishing agent can deal with five major types of fires: A (surface) / B / C / E / F. It has a storage temperature of -60 to +160°C and is not afraid of bumps and vibrations. It is stored in a solid state and will not be activated until it exceeds 410°C. It is released from solid to gaseous state and is maintenance-free for ten years. It is suitable for use as a fire alarm agent in underground pipe gallery cable trenches.

[0055] The amount of safe and nontoxic potassium ion fire extinguishing agent is determined by multiplying the fire extinguishing concentration value of the potassium ion fire extinguishing agent according to the internal space volume of each protection area. According to the amount of potassium ion fire extinguishing agent, the number M of fire extinguishing cores required in each protection area is obtained. Assuming that the length of each protection area is L and the length of the fire extinguishing core installation shell 2 is l, the maximum number of fire extinguishing core installation shells 2 that can be accommodated in each protection area is L / l.

[0056] The fire extinguishing core is arranged in the fire extinguishing core installation shell. Figure 3As shown, the fire extinguishing core installation shell is a tubular structure, and a plurality of through holes (jet holes) are provided in the front, middle and rear sections of the outer wall of the tube. A plurality of fire extinguishing cores are provided between the jet holes in the front section and the middle section, and between the jet holes in the middle section and the rear section. After the end face of the fire extinguishing core is activated, it sprays in the fire extinguishing core installation shell and is sprayed out through the through holes provided on the fire extinguishing core installation shell. The inner surface of the first end of the fire extinguishing core installation shell is provided with threads, and the outer surface of the second end is provided with threads.

[0057] In this embodiment, the number k of the fire extinguishing core installation housings 2 provided in each protection area is determined by the whale optimization algorithm with the maximum gas injection distance as the goal, and specifically includes the following steps:

[0058] (1) Obtain the amount of gas N released by each fire extinguishing core at the working temperature T, then the amount of gas released by M fire extinguishing cores is NM;

[0059] (2) Initialize t = 0, and initialize a number of individuals, each of which is encoded as the number k (less than L / l) of fire extinguishing core installation shells, then the total number of jet holes n = kQ, Q represents the number of jet holes on each fire extinguishing core installation shell;

[0060] (3) For each individual, the gas pressure is calculated based on the working temperature T, the gas volume NM and the volume V, and it is determined whether the gas pressure is less than the bearing capacity P of the fire extinguishing core mounting shell and the thermal wire mounting shell. If so, the gas injection distance is calculated based on the gas pressure and the total number of injection holes n; wherein the volume V is the sum of the volumes of all the fire extinguishing core mounting shells and the thermal wire mounting shells (thermal wire mounting shells for placing longitudinal thermal wires) in the protection area;

[0061] (4) For each individual, the shrinking and surrounding strategy, prey search strategy, and spiral update strategy in the whale optimization algorithm are executed;

[0062] (5) Determine whether t reaches the set value. If so, select the individual corresponding to the maximum gas injection distance from all individuals and decode to obtain the number k of fire extinguishing core installation shells; otherwise, return to step (3).

[0063] The number k of fire extinguishing core installation shells determined through the above steps can not only keep the gas pressure within a safe range, but also ensure that the gas injection distance is far enough to expand the fire extinguishing range as much as possible.

[0064] In this embodiment, in order to prevent the fire extinguishing core from moving, a slidable positioning member is provided inside the fire extinguishing core mounting shell.

[0065] In this embodiment, the temperature sensing device used is a thermistor, the burning rate is about 5 to 8 seconds per meter, the trigger temperature is 176° C., and it is purely physical temperature sensing start.

[0066] The thermal wire installation shell is an aluminum tube. The inner surface of the first end of the thermal wire installation shell is arranged with threads, and the outer surface of the second end is arranged with threads. The two thermal wire installation shells are connected by the cooperation of internal and external threads. Specifically, the first end of one thermal wire installation shell is screwed into the second end of the other thermal wire installation shell. Similarly, a fire extinguishing core installation shell and a thermal wire installation shell are also connected by the cooperation of internal and external threads.

[0067] like Figure 2 As shown, in addition to the thermal wire installation shell parallel to the fire extinguishing core installation shell (for placing the longitudinal thermal wire), there is also a thermal wire installation shell perpendicular to the direction of the fire extinguishing core installation shell (for placing the transverse thermal wire).

[0068] The fire extinguishing cores in two adjacent fire extinguishing core installation shells are connected by a thermistor, and the thermistor connecting the fire extinguishing cores of the two adjacent fire extinguishing core installation shells (longitudinal thermistor) is consistent with the direction of the fire extinguishing core installation shells, and a thermistor perpendicular to the direction of the fire extinguishing core installation shells is provided in the middle of the thermistor connecting the fire extinguishing cores of the two adjacent fire extinguishing core installation shells, and the thermistor perpendicular to the direction of the fire extinguishing core installation shells (transverse thermistor) is connected to the temperature sensing neural network arranged on the two side walls of the cable trench.

[0069] like Figure 4 As shown, for each side wall of the cable trench, it is divided into several grids, and the grid in contact with the above-mentioned transverse thermal line is taken as a fixed point. The coverage area of ​​the selected grid is the largest and the number of selected grids is the least as the goal. A multi-objective optimization algorithm is used to select several grids other than the fixed points as mobile points; the thermal line is laid out with the shortest connection between all fixed points and mobile points to obtain a temperature-sensing neural network. Among them, the calculation method of the coverage area of ​​the selected grid is: the sum of the radiation areas of the fixed point and the selected mobile point (minus the area of ​​the overlap), and the radiation area is the area of ​​a circle with the fixed point or the mobile point as the center and the set value as the radius. In this embodiment, the temperature-sensing neural network is designed with the largest coverage area and the least number of selected grids as the goal, which can not only react quickly when a fire occurs, but also save the material of the thermal line.

[0070] Among them, the multi-objective optimization algorithm adopts a multi-objective genetic algorithm. The specific steps of the multi-objective genetic algorithm are:

[0071] Step (1), initializing the population, there are N individuals in the population, each individual is obtained by randomly selecting a grid of several non-fixed points;

[0072] Step (2), performing crossover and mutation operations on each individual in the population to obtain a new population containing N new individuals, and merging the new population with the population before the crossover and mutation operations to obtain a merged population;

[0073] Step (3), taking the coverage area of ​​the selected grid as the largest and the selected grid as the least as the goal, through non-dominated sorting and crowding calculation, select N individuals from the merged population to update the population;

[0074] Step (4), determine whether the number of iterations reaches the maximum value, if so, select an individual in the population as the optimal individual, otherwise, increase the number of iterations by 1 and return to step (2);

[0075] Step (5), the shortest connection lines between all fixed points and several grids represented by the optimal individuals are laid out as thermosensitive lines to obtain a temperature sensing neural network.

[0076] Once a fire occurs in a certain section of the cable trench in the corridor, the high-temperature thermal radiation will ignite the thermistor in a certain part of it. The thermistor will carry the spark into the fire extinguishing core, which will be ignited (spontaneously combust), and all the fire extinguishing cores in the area will be activated in a chain reaction, spraying out ionic potassium oxide, which reacts with flame free radicals, extinguishing the open flame at the source of the fire immediately and continuously suppressing it to prevent re-ignition.

[0077] The fire alarm system for underground cable trenches provided in this embodiment sets the controller and the alarm device outside the cable trench, which not only enables the staff to detect the alarm signal in time, but also protects the controller and the alarm device under fire; moreover, setting the sensor on the top of the fire extinguishing core can play a role in protecting the sensor.

[0078] The fire alarm system for underground cable trenches provided in this embodiment can realize purely physical temperature sensing and automatic fire extinguishing even without external power supply.

[0079] The fire alarm system for underground cable trenches in pipe galleries provided in this embodiment uses a safe and non-toxic potassium ion fire extinguishing agent applied to the pipe gallery cable trenches, does not rely on human firefighting, avoids casualties, extinguishes fires early and in a small scale, and minimizes losses.

[0080] The fire alarm system for underground cable trenches provided in this embodiment uses potassium ion fire extinguishing agent, which can be realized without external sensors, power supply operation, and pure physical temperature sensing activation, without considering the type of fire.

[0081] This embodiment provides a fire alarm system for underground cable trenches in utility corridors, in which each partition space is independently protected and whichever section is on fire will be activated.

[0082] The fire alarm system provided in this embodiment for underground cable trenches of utility tunnels can press the pause button for fires, thereby buying time for fire trucks to arrive at the scene.

[0083] Example 2

[0084] Embodiment 2 of the present invention provides a working method of a fire alarm system for an underground pipe gallery cable trench as in Embodiment 1, comprising the following steps:

[0085] When the temperature in the cable trench exceeds the threshold, the transverse thermal wire, longitudinal thermal wire or temperature-sensing neural network will spontaneously ignite;

[0086] The sensor collects fire signals. After receiving the fire signals from the sensors, the controller controls the alarm device to sound an alarm and controls the igniter to ignite.

[0087] The gas generated after the fire extinguishing core is ignited is ejected out of the fire extinguishing core installation shell through the jet hole.

[0088] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A fire alarm system for underground pipe gallery cable trench, characterized in that: It includes a controller, a sensor, an igniter, an alarm device, a transverse heat-sensitive wire, a longitudinal heat-sensitive wire, a plurality of fire-extinguishing core installation shells arranged along the cable direction, a fire-extinguishing core arranged in the fire-extinguishing core installation shell, and a temperature-sensing neural network composed of heat-sensitive wires arranged on the cable trench wall; The longitudinal thermal wire is used to connect the fire extinguishing core; the transverse thermal wire is used to connect the longitudinal thermal wire and the temperature sensing neural network; the transverse thermal wire, the longitudinal thermal wire and the temperature sensing neural network all spontaneously ignite when the temperature in the cable trench exceeds a threshold value; The ignition head of the igniter is connected to the longitudinal thermal wire or the transverse thermal wire; the sensor is arranged just above the fire extinguishing core installation shell, and the sensor is used to collect fire signals; the controller and the alarm device are arranged outside the cable trench, and the controller is used to control the alarm device to alarm after receiving the fire signal from the sensor, and control the igniter to ignite; The fire extinguishing core installation shell is provided with a plurality of jet holes, and the jet holes are used to eject the gas generated after the fire extinguishing core is ignited out of the fire extinguishing core installation shell; The design steps of the temperature sensing neural network include: for each side wall of the cable trench, a plurality of grids are divided, the grids in contact with the transverse thermal sensitive wire are taken as fixed points, the minimum number of selected grids and the maximum coverage area of ​​the selected grids are taken as the goal, a multi-objective optimization algorithm is used, a plurality of grids other than the fixed points are selected as mobile points, the thermal sensitive wires are arranged with the shortest connection lines between all the fixed points and the mobile points, and the temperature sensing neural network is obtained; Also included is a mounting shell, the mounting shell including pillars, a bottom plate, support columns and a top plate; The bottom end of the pillar is inserted into the ground, the top end of the pillar is fixedly connected to the bottom surface of the base plate, one support pillar is fixed to each of the four corners of the base plate, and the base plate is fixed to the bottom end of the support pillar, the top plate is arranged on the top end of the support pillar, and the alarm device and the controller are placed on the base plate; Also included is a supporting device, the supporting device comprising a base, a supporting rod and a mounting seat; The bottom end of the support rod is connected to the base, and the base is buried in the bottom of the cable trench. The top end of the support rod is fixedly connected to the mounting seat, and the mounting seat has a first mounting hole along the cable laying direction. The first mounting hole is used for the fire extinguishing core mounting shell or the longitudinal thermal sensitive wire to pass through.

2. A fire alarm system for underground pipe gallery cable trench according to claim 1, characterized in that: The number of fire extinguishing core installation shells to be set in each protection area of ​​the underground cable trench is determined by the whale optimization algorithm with the maximum gas injection distance as the goal.

3. A fire alarm system for underground pipe gallery cable trench according to claim 1, characterized in that: The transverse thermal-sensitive wire and the longitudinal thermal-sensitive wire are both arranged in a thermal-sensitive wire installation housing, and the thermal-sensitive wire installation housing is an aluminum tube.

4. A fire alarm system for underground pipe gallery cable trench according to claim 1, characterized in that: The coverage area is the sum of the radiation areas of the fixed point and the mobile point, and the radiation area is the area of ​​a circle with the fixed point or the mobile point as the center and a set value as the radius.

5. A fire alarm system for underground pipe gallery cable trench according to claim 1, characterized in that: It also includes a power supply module arranged outside the cable trench, and the power supply module is used to supply power to the controller, the sensor, the igniter and the alarm device.

6. A fire alarm system for underground pipe gallery cable trench according to claim 1, characterized in that: The mounting seat is provided with a second mounting hole which is perpendicular to the first mounting hole, and the second mounting hole is used for the passage of a transverse thermal sensitive wire.

7. A working method for a fire alarm system for an underground pipe gallery cable trench according to any one of claims 1 to 6, characterized in that: The steps include: When the temperature in the cable trench exceeds the threshold, the transverse thermal wire, longitudinal thermal wire or temperature-sensing neural network will spontaneously ignite; The sensor collects fire signals. After receiving the fire signals from the sensors, the controller controls the alarm device to give an alarm and controls the igniter to ignite. The gas generated after the fire extinguishing core is ignited is ejected out of the fire extinguishing core installation shell through the jet hole.

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