Condensed aerosol fire extinguishing device and metering box block type fire extinguishing system and method

Abstract

The invention relates to a condensed aerosol fire extinguishing device and a metering box block type fire extinguishing system and method, and belongs to the technical field of metering box fire extinguishing. The metering box block type fire extinguishing system comprises a sensing device, a main control chip, a communication device and a fire extinguishing device which are arranged in a single metering box, modules in the metering box are connected with a central control system through power line carrier communication, and the central control system communicates with a Web terminal or App software. The occurrence rate of fire accidents of the metering box is remarkably reduced, and the safety of a power system is improved. And by reducing fire loss and maintenance cost, economic benefits are maximized.

Description

Technical Field

[0001] The present application belongs to the technical field of metering box fire extinguishing, and specifically relates to a hot aerosol fire extinguishing device and a metering box block type fire extinguishing system and method. Background Art

[0002] As a bridge between the power system and users, the electric energy metering device is of great significance to both the system and users. It is mainly used to calculate the user's power consumption, plant power consumption, power generation, line loss, and power supply. It is a common metering instrument.

[0003] In recent years, the electricity load of ordinary residential users has increased significantly. Coupled with factors such as irregular electricity use in some rural areas and aging equipment, fires in meter boxes occur frequently. In some places, they even cause fires, seriously threatening equipment and personal safety.

[0004] The main causes of fire in meter boxes are: overload, short circuit, aging or damage of equipment. At the same time, existing meter boxes lack fire control devices.

[0005] Commonly used fire extinguishing devices include: dry powder fire extinguishing devices, hot aerosol fire extinguishing devices and fire detection tube fire extinguishing devices. The existing metering boxes have not yet reached the retirement age, and the collective replacement cost is high and the workload is large. Priority should be given to low-cost components, which can be directly installed on the basis of the original metering boxes. For outdoor metering boxes, commonly used smoke or heat fire detectors are easily affected by airflow, dust and other factors during operation, causing false alarms or missed alarms. In addition, dry powder fire extinguishing agents are easily deliquesced and agglomerated when stored in outdoor metering boxes for a long time, which has the disadvantages of clogging pipelines and losing fire extinguishing performance, and cannot protect electrical equipment well. Summary of the invention

[0006] The technical problem to be solved by this application is to overcome the deficiencies of the prior art and provide a hot aerosol fire extinguishing device and a meter box block fire extinguishing system and method. This application significantly reduces the incidence of meter box fire accidents and improves the safety of the power system. By reducing fire losses and maintenance costs, the economic benefits are maximized.

[0007] The technical solution adopted by this application to solve the problems existing in the prior art is:

[0008] A hot aerosol fire extinguishing device comprises a hot aerosol fire extinguisher. A plurality of hot aerosol fire extinguishers are fixed on a fixed plate by a clamping mechanism. A discharge pipe is connected through the discharge pipe. A plurality of branch pipes are connected through the discharge pipe. A first electric control valve is arranged on the branch pipe. A discharge pipe with a spray hole is connected at the end of the branch pipe.

[0009] Preferably, the clamping mechanism includes a top buckle cover and an outlet buckle cover connected at both ends of the hot aerosol fire extinguisher, the top buckle cover and the outlet buckle cover are fixedly connected by a connecting screw, a sleeve is provided on the outlet buckle cover, and the discharge pipe is through-connected with the sleeve.

[0010] Preferably, a bracket is provided on the fixing plate, and the connecting screw is threadedly connected to the threaded hole on the bracket.

[0011] Preferably, an arc-shaped opening is provided at the end of the branch pipe, and a rotating tube is connected to the end of the ejection pipe connected to the branch pipe. The rotating tube is coaxially rotatably connected to the arc-shaped opening, and an inlet connected to the arc-shaped opening is opened on the circumferential surface of the rotating tube.

[0012] Rotating shafts are coaxially fixed at both ends of the rotating pipe, a fixed connecting sleeve is sleeved on the branch pipe, rotating sleeves are fixed on both sides of the connecting sleeve, and the rotating sleeves are sleeved on the rotating shaft.

[0013] A torsion spring is connected between the rotating shaft and the connecting sleeve.

[0014] Preferably, a bottom limiting plate is fixed to one side of the connecting sleeve located at the spray hole of the spray pipe, and the bottom limiting plate abuts against the end surface of the spray pipe provided with the spray hole.

[0015] Preferably, a high-pressure gas tank is fixed on the fixed plate, the outlet of the high-pressure gas tank is connected to a cleaning main pipe, a cleaning branch pipe is connected to the cleaning main pipe, the cleaning branch pipe is connected to the discharge pipe, and a second electric-controlled valve is provided on the cleaning branch pipe.

[0016] A meter box block type fire extinguishing system, comprising a sensor device, a main control chip, a communication device and a fire extinguishing device arranged inside a single meter box, wherein the internal module of the meter box is connected to a central control system via power line carrier communication, and the central control system communicates with a Web terminal or App software;

[0017] The sensor device is mainly used to collect smoke, temperature and current signals;

[0018] The main control chip is used to process the data collected by the sensor in real time and make corresponding decisions;

[0019] The communication device is used to communicate with the central control system;

[0020] The fire extinguishing device is controlled by the main control chip to perform fire extinguishing operations.

[0021] Preferably, the fire extinguishing device is a hot aerosol fire extinguishing device.

[0022] Preferably, the sensing devices are selected from ion type smoke sensors, K-type thermocouple temperature sensors and electromagnetic current transformers.

[0023] A fire extinguishing method of a metering box block type fire extinguishing system comprises the following steps:

[0024] S01, initialize the system at the beginning, establish communication with the server, set the thresholds of various data, the temperature thresholds are T0, T1 and T3, the smoke concentration thresholds are S0, S1 and S3, and the current thresholds are I0, I1 and I3;

[0025] S02, the parameters inside the metering box are detected by various sensors to obtain the values ​​T, S and I, and the values ​​are compared with the above-set thresholds to check whether T>T0&&S<S0&&I<I0. If the answer is "no", no action is taken; if the answer is "yes", the following step S03 is performed;

[0026] S03: further compare the values ​​collected in step S02. There are two methods for comparison:

[0027] The first method is to compare according to the following logical expression, which is T0<T<T1||S0<S<S1||I0<I<I1&&T<T1&&S<S1&&I<I1. If the answer is "no", return to step S02. If the answer is "yes", send out an early warning signal, and the operator determines whether to manually start the fire extinguishing device according to the early warning signal. If not, return to step S02. If it is started, start all the fire extinguishing devices.

[0028] The second method is to compare according to the following logical expression, which is T>T1||S>S1||I>I1. If it is "no", return to step S02. If it is "yes", trip the circuit breaker and start the corresponding fire extinguishing device. After starting the corresponding fire extinguishing device, if the collected data meets T>T3||S>S3||I>I3, start all fire extinguishing devices.

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

[0030] (1) The hot aerosol self-extinguishing device is low-cost, widely compatible, easy to assemble, has high promotion value, and can significantly reduce equipment losses caused by fire accidents and protect the personal and property safety of residents. Its benefits are obvious.

[0031] (2) It integrates the detection of temperature, smoke and short-circuit faults, can comprehensively judge the fire situation, and realize remote monitoring and management through intelligent processing and power line carrier communication. It also has tripping and fire extinguishing functions, which can cut off the power supply and extinguish the fire in time to reduce losses. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The present application is further described below in conjunction with the accompanying drawings and embodiments.

[0033] Figure 1 This is an overall system diagram of a metering box block type fire extinguishing system for this application.

[0034] Figure 2 This is a diagram of a single metering box system in a metering box block type fire extinguishing system in this application.

[0035] Figure 3 This application is a working control schematic diagram of a metering box block type fire extinguishing system.

[0036] Figure 4 This is a communication system diagram of a meter box block type fire extinguishing system in this application.

[0037] Figure 5 This is a structural diagram of the hot aerosol fire extinguishing device arranged inside the metering box in this application.

[0038] Figure 6 This is the structural diagram of the hot aerosol fire extinguishing device in this application.

[0039] Figure 7 This is a structural diagram of the fire extinguishing unit arrangement in the hot aerosol fire extinguishing device in this application.

[0040] Figure 8 for Figure 7 An exploded diagram of

[0041] Fig. 9 This is a structural diagram of the injection unit in the hot aerosol fire extinguishing device in this application.

[0042] Fig.10 for Fig. 9 An exploded diagram of

[0043] Fig.11 This is a structural diagram of a fire extinguishing unit fixing plate in the hot aerosol fire extinguishing device in this application.

[0044] In the figure: 1-hot aerosol fire extinguisher, 2-top buckle cover, 201-first pressure ring, 202-first flange ring, 3-spray end buckle cover, 301-second pressure ring, 302-second flange ring, 4-connecting screw, 5-sleeve, 6-discharge pipe, 7-branch pipe, 701-arc mouth, 8-first electric control valve, 9-connecting sleeve, 901-rotating sleeve, 902-bottom limit plate, 10-spray pipe, 1001-spray hole, 1002-rotating pipe, 1003-rotating shaft, 11-torsion spring, 12-fixed plate, 1201-bracket, 13-high-pressure gas tank, 14-cleaning main pipe, 15-cleaning branch pipe, 16-second electric control valve, 17-metering box, 18-metering meter. DETAILED DESCRIPTION

[0045] For example, certain words are used in the specification and claims to refer to specific components. Those skilled in the art should understand that hardware manufacturers may use different terms to refer to the same component. This specification and claims do not use differences in names as a way to distinguish components, but use differences in the functions of components as the criteria for distinction. For example, "including" mentioned throughout the specification and claims is an open term, so it should be interpreted as "including but not limited to". "Approximately" means that within an acceptable error range, those skilled in the art can solve the technical problem within a certain error range and basically achieve the technical effect.

[0046] In the description of the present application, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "horizontal", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as limiting the present application.

[0047] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0048] The following is a further detailed description of a hot aerosol fire extinguishing device and a metering box block fire extinguishing system of the present application in conjunction with the accompanying drawings, but it is not intended to limit the present application.

[0049] A metering box block type fire extinguishing system, consisting of Figure 1 , Figure 2 as well as Figure 4 As shown, a single meter box includes a sensor device, a main control chip, a communication device, and a fire extinguishing device, and may also include a tripping device. All internal modules of the meter box are connected to the central control system through power line carrier communication, and the central control system communicates with the Web terminal or App software.

[0050] The fire extinguishing devices commonly used in metering boxes mainly include dry powder fire extinguishers, thermal aerosol fire extinguishers and fire detection tube fire extinguishing devices.

[0051] The advantages of dry powder fire extinguishers are low cost and easy operation. They are widely applicable to various types of fires, including solid, liquid, gas and electrical fires. The fire extinguishing agent is easy to store and transport; the disadvantage is that the dry powder fire extinguishing agent is easy to deliquesce and agglomerate during long-term use or storage, which may cause pipe blockage and reduced fire extinguishing performance. The dry powder residue produced after fire extinguishing is difficult to clean and may cause damage to the equipment. Smoke or heat detectors are easily affected by factors such as airflow and dust, and have a high risk of false alarms or missed alarms. They cannot protect electrical equipment well, and the fire extinguishing agent residue may cause equipment short circuit or damage

[0052] The advantages of thermal aerosol fire extinguishers are that the solid particles are fine and have some characteristics of gas, and they can bypass obstacles to achieve full flooding and extinguishing. The fire extinguishing efficiency is high and the storage period of the fire extinguishing agent is long. It is environmentally friendly and does not produce harmful substances. The disadvantages are that the fire extinguishing agent is wasted and may not be fully utilized. The continuous use is poor and the fire extinguishing agent needs to be replaced regularly. The detection sensitivity is not high and the fire may not be detected in time. It cannot reliably protect electrical equipment, especially in the early stage of a fire.

[0053] The advantages of the fire-detection tube fire-extinguishing device are simple structure and high reliability. It is suitable for relatively closed electrical equipment. The amount of fire extinguishing agent is small and the fire extinguishing efficiency is high. The disadvantages are that it is difficult to install and may damage the insulation performance of the electrical equipment. The maintenance cost is high. Replacing the fire-detection tube requires re-laying in the electrical equipment, which requires a lot of construction. The fire-detection tube itself has a limited life and needs to be replaced regularly. The types and formulations of fire extinguishing agents may be limited and may not be suitable for all types of fires.

[0054] This embodiment combines the advantages and disadvantages of the above various fire extinguishers, and the fire extinguishing device of this embodiment selects a hot aerosol fire extinguishing device composed of a hot aerosol fire extinguisher.

[0055] Thermal aerosols are divided into S-type aerosols and K-type aerosols. The main components of K-type aerosols are potassium salts, including K2CO3, KHCO3, and K2O. These three substances are highly hygroscopic and easily soluble in water, so their precipitation will affect the insulation strength of the instrument after combining with water molecules in the air. K-type aerosols should be avoided in microcircuit boards and some precision instruments. The main component of S-type aerosols is strontium salts, which have a low dust fall rate and good insulation, and will not pose a hidden danger to electrical equipment. Compared with K-type aerosols, S-type aerosols are more suitable for use in electrified scenes.

[0056] As another halon substitute, the advantages of hot aerosol fire extinguishing agent are mainly: the solid particles are small and have some characteristics of gas, which can flow around obstacles to achieve full flooding fire extinguishing. The aerosol fire extinguishing system adopts a full flooding fire extinguishing method in the protection area, but there are problems such as waste of fire extinguishing agent and poor sustainable use. At the same time, the detection sensitivity of the hot aerosol fire extinguishing system is not high and cannot reliably protect electrical equipment. However, in the relatively closed environment of the metering box, it can be preserved for a considerable period of time, and can be designed to be electrically triggered in conjunction with sensors and main control chips to make up for the defect of low detection sensitivity. In particular, the hot melt adhesive release device can be isolated into different blocks, and can be released in stages through electrical signals to avoid unnecessary waste. Therefore, S-type hot aerosol is used as the fire extinguishing material of the fire extinguishing module.

[0057] In this embodiment, Figures 5 to 11 As shown, the hot aerosol fire extinguishing device includes a hot aerosol fire extinguisher 1, and several hot aerosol fire extinguishers 1 are fixed on a fixed plate 12 by a clamping mechanism. The spraying end of a single hot aerosol fire extinguisher 1 is connected with a discharge pipe 6, and the discharge pipe 6 is connected with several branch pipes 7. The branch pipe 7 is provided with a first electric control valve 8, and the end of the branch pipe 7 is connected with a spray pipe 10 with a spray hole 1001.

[0058] When in use, the fixing plate 12 is fixed inside the metering box 17 , each row of metering meters 18 corresponds to a discharge pipe 6 , and each metering meter 18 corresponds to a branch pipe 7 and a spray pipe 10 .

[0059] The clamping mechanism includes a top buckle cover 2 and an outlet buckle cover 3 connected at both ends of the hot aerosol fire extinguisher 1. The top buckle cover 2 and the outlet buckle cover 3 are fixedly connected by a connecting screw 4. A sleeve 5 is provided on the outlet buckle cover 3, and a discharge pipe 6 is connected to the sleeve 5 through the sleeve 5.

[0060] Specifically, the top buckle cover 2 includes a first pressure ring 201 and a first flange ring 202 that are connected to each other, and the spray end buckle cover 3 includes a second pressure ring 301 and a second flange ring 302 that are fixedly connected to each other. The first pressure ring 201 and the second pressure ring 301 clamp the hot aerosol fire extinguisher 1 in the middle, and the connecting bolts 4 tighten the first flange ring 202 and the second flange ring 301.

[0061] The fixing plate 12 is provided with a bracket 1201 , and the connecting screw 4 is threadedly connected to the threaded hole on the bracket 1201 .

[0062] In order to increase the fire extinguishing area, in the present embodiment, the ejection pipe 10 is in a swinging state during the spraying process. For this purpose, an arc-shaped opening 701 is provided at the end of the branch pipe 7. A rotating pipe 1002 is connected to the end of the ejection pipe 10 connected to the branch pipe 7. The rotating pipe 1002 is coaxially rotatably connected to the arc-shaped opening 701. An inlet connected to the arc-shaped opening 701 is provided on the circumferential surface of the rotating pipe 1002.

[0063] The rotating tube 1002 is coaxially fixed with a rotating shaft 1003 at both ends, the branch tube 7 is sleeved with a fixed connecting sleeve 9, and the connecting sleeve 9 is fixed with rotating sleeves 901 on both sides, and the rotating sleeves 901 are sleeved on the rotating shaft 1003;

[0064] A torsion spring 11 is connected between the rotating shaft 1003 and the connecting sleeve 9 .

[0065] A bottom limiting plate 902 is fixed to one side of the connection sleeve 9 located at the spray hole of the spray pipe 10 , and the bottom limiting plate 902 abuts against the end surface of the spray pipe 10 provided with the spray hole 1001 .

[0066] During the process of spraying the fire extinguishing agent, the swing of the spray pipe 10 is controlled by opening and closing the first solenoid valve 8. When spraying, the spray pipe 10 swings up under the action of the impact force, the first solenoid valve 8 is closed, and the spraying stops. The spray pipe 10 is reset under the action of the torsion spring 11, and the first solenoid valve 8 is opened after resetting.

[0067] A high-pressure gas tank 13 is fixed on the fixed plate 12 , and a cleaning main pipe 14 is connected to the outlet of the high-pressure gas tank 13 , a cleaning branch pipe 15 is connected to the cleaning main pipe 14 , the cleaning branch pipe 15 is connected to the discharge pipe 6 , and a second electric control valve 16 is provided on the cleaning branch pipe 15 .

[0068] At the end of fire extinguishing, the fuel in the hot aerosol fire extinguisher 1 is burned, the pressure of the ejected hot aerosol is low, and there will be residue inside the discharge pipe 6. At this time, the corresponding second electrically controlled valve 16 is opened, so that the high-pressure gas inside the high-pressure gas tank 13 enters the discharge pipe 6 through the corresponding cleaning branch pipe 15, and the first electrically controlled valve 8 on all the branch pipes 7 on the discharge pipe 6 is opened at the same time to clean the discharge pipe 6, the branch pipe 7 and the ejection pipe 10.

[0069] The sensor device is mainly used to collect signals such as smoke, temperature and current. Considering the application scenario and cost, the sensors are selected as ion smoke sensor, K-type thermocouple temperature sensor and electromagnetic current transformer respectively. The specific reasons are as follows:

[0070] Smoke sensors mainly include planar semiconductor gas sensors, ion smoke sensors, laser smoke sensors, and image smoke sensors. Although the meter box is outdoors, the interior is a relatively sealed environment, which is mainly affected by environmental conditions such as temperature, humidity, and direct sunlight. Laser smoke sensors are easily affected by direct sunlight, so they are not applicable; the meter box is darker and has a narrow space, which is not suitable for image smoke sensors; for planar semiconductor gas sensors such as MQ-2, they can detect many types of gases, and the resistance change of gas-sensitive materials is greatly affected by temperature and sunlight, so they are not the best choice. Most of the existing ion smoke sensors on the market have a lifespan of about 10 years, and their radioactivity is very low. In the meter box, there is generally no impact from environmental factors such as smoking, cooking smoke, and detergents, so their shortcomings can be basically ignored. Therefore, the use of ion smoke sensors is the best choice.

[0071] For the temperature sensor, K-type thermocouple temperature sensor is selected, taking into account the internal ambient temperature of the meter box, the internal ambient temperature under direct sunlight, the narrow internal space of the meter box, and the cost. K-type thermocouple can respond to temperature changes quickly and almost does not cause serious system delays. It can work in a wide temperature range, up to about 1300℃, and is suitable for fire temperature detection. K-type thermocouple temperature sensor is a high-temperature and cheap metal thermocouple. It is cheap and widely used, and its annual output accounts for almost half of all metal thermocouples. The relationship between thermoelectric potential and temperature is approximately linear, and the measurement results have high repeatability. At 1300℃, the thermoelectric potential can reach 52.4mV, and the thermoelectric potential rate is high, which is 41UV / ℃. It can be used for a long time in oxidizing atmosphere and air, and has good stability.

[0072] The current transformer can adopt a simple electromagnetic current transformer, which is cheap and easy to install. It can be used directly after designing the corresponding overcurrent protection circuit and sampling circuit.

[0073] The device is powered directly by the phase and neutral lines of the meter box and is equipped with a small UPS backup power supply to provide continuous power to the device to prevent power outages after a substation fire from affecting the normal operation of the device.

[0074] In this embodiment, the meter box block type fire extinguishing system includes the following three layout forms:

[0075] The first type, the sensing devices respectively select photoelectric maze smoke sensor, infrared receiving flame sensor, ultraviolet arc sensor and K-type thermocouple sensor, and each sensor module collects the fire characteristic parameters in the metering box.

[0076] The signals collected by the sensor are processed by the main control chip, which uses the STC8 single-chip microcomputer. The initial address is configured for each LoRa node corresponding to the slave through the configuration software. The central control system is used as the master node to realize the point-to-multiple transmission mode, apply the tripping function, and use the hot aerosol fire extinguishing device for fire extinguishing operations.

[0077] This fire extinguishing method uses multi-sensor fusion, photoelectric maze smoke sensors, infrared receiving flame sensors, ultraviolet arc sensors and K-type thermocouple sensors to comprehensively monitor various characteristic parameters of fire and improve the accuracy and reliability of fire detection. The STC8 microcontroller is cheap as the main control chip, and can process the data collected by the sensor in real time and make corresponding decisions. The point-to-multi transmission mode is realized through LoRa technology, which ensures the stability and reliability of data transmission and facilitates remote monitoring and management. The tripping function can cut off the power supply in time to minimize the occurrence of fire, and the thermal aerosol fire extinguishing device can quickly extinguish the fire and reduce losses.

[0078] The second type, the sensor module uses thermal insulating materials as the only criterion for the occurrence of fire. When the temperature reaches 180 degrees, the fire extinguishing aerosol is directly released to extinguish the fire. The tripping function is not used, and the hot aerosol fire extinguishing device is started to perform fire extinguishing operations.

[0079] This fire extinguishing method is simple and direct, using only heat-sensitive insulating materials as the criterion for fire occurrence, which is simple, direct and easy to implement. The equipment cost and installation cost are very low, avoiding complex circuit design and sensor installation and debugging.

[0080] However, the heat-sensitive materials can only respond after a fire occurs, or even after a period of time when an open flame is generated. The response is not fast enough, there is no early warning, it is not intelligent enough, and it is not convenient to manage. The judgment criteria are too simple, which is easy to cause misjudgment and wrong judgment. Moreover, the power supply cannot be cut off in time, which may increase the risk of fire.

[0081] The third type, the sensor module includes a K-type thermocouple sensor, a wired ion smoke sensor and a current transformer. Multiple K-type thermocouple sensors distributed at fault-prone points are used as temperature detection devices. The wired ion smoke sensor detects the smoke concentration. The current transformer is used to quickly determine whether the meter box has a short circuit fault. The signal collected by the sensor is processed by the main control chip, which uses an STC8 single-chip microcomputer. The initial address is configured for each node corresponding to the slave through the configuration software. The central control system is used as the main node, and the original power line carrier communication is used to form a local area network to realize the point-to-multipoint transmission mode, put into the tripping function, and start the hot aerosol fire extinguishing device to perform fire extinguishing operations.

[0082] This fire extinguishing method uses a K-type thermocouple sensor to detect temperature and a wired ion smoke sensor to detect smoke concentration, which can accurately determine the fire situation. In conjunction with short-circuit fault detection, the current transformer can quickly determine whether a short-circuit fault occurs in the meter box, and the power supply can be quickly cut off to avoid the occurrence of fire to the greatest extent. As the main control chip, the STC8 microcontroller can process the data collected by the sensor in real time, and realize remote monitoring and management through power line carrier communication technology.

[0083] This embodiment preferably uses the third arrangement, which combines the detection of temperature, smoke and short-circuit faults, can comprehensively judge the fire situation, and realize remote monitoring and management through intelligent processing and power line carrier communication. At the same time, it has the functions of tripping and fire extinguishing, which can cut off the power supply and extinguish the fire in time to reduce losses. In addition, the K-type thermocouple sensor has low cost and can be distributed at various fault-prone points in the meter box to ensure rapid response to the fire. The use of the existing power line carrier communication in the meter box greatly reduces the equipment cost.

[0084] The tripping device uses a relay circuit and is directly controlled by the MCU to trip.

[0085] For ordinary household electricity users, it is not realistic to equip each meter with a 4G communication module. The investment in the communication equipment and the payment of the communication fee are unaffordable, whether borne by the electricity user or the power supplier. Considering that the power line carrier communication used by the electricity meter in the existing meter box covers every electricity user and can transmit power information using the power line, this is a preferred choice to solve the problem.

[0086] The complete communication system consists of Figure 4 The communication process mainly includes signal input, source coding, channel coding, and then transmission through the transmitter and reception by the receiver. After reception, the receiver performs channel decoding, source decoding and signal output, all of which adopt existing technologies. Therefore, its detailed layout and working principle are not explained, and it also does not affect the integrity of the solution.

[0087] The software push part can choose from a variety of methods such as PC display, mobile APP push, and SMS warning push. The temperature rise, smoke, short circuit, fire extinguishing and other functions of the on-site meter box can be integrated together for display and push, so that operation and maintenance personnel can timely grasp the safe operation status of each meter box.

[0088] Generally speaking, the sensor module includes a temperature detection module, a smoke concentration detection module and a current transformer module, which transmits fire parameter data such as temperature, smoke and current to the central control system. The central control system determines the fire situation and transmits an alarm or fire extinguishing command. If a fire occurs, an electrical signal is sent to quickly start the thermal aerosol fire extinguishing device. At the same time, the central control system will send the fire situation in the substation and the operation of the thermal aerosol fire extinguishing equipment to the administrator's mobile terminal through the communication module. The thermal aerosol fire extinguishing device mainly controls the corresponding controller according to the real-time fire information in the substation to complete the fire extinguishing work and realize decentralized fire extinguishing. A local area network is established between the modules of the entire meter box fire fighting device for communication. The device is equipped with a small UPS backup power supply to continuously power the device to prevent power outages after the meter box fire from affecting the normal operation of the device.

[0089] Depend on Figure 3 As shown, a fire extinguishing method of a metering box block type fire extinguishing system comprises the following steps:

[0090] S01, initialize the system at the beginning, establish communication with the server, set the thresholds of various data, the temperature thresholds are T0, T1 and T3, the smoke concentration thresholds are S0, S1 and S3, and the current thresholds are I0, I1 and I3;

[0091] S02, the parameters inside the metering box are detected by various sensors to obtain the values ​​T, S and I, and the values ​​are compared with the above-set thresholds to check whether T>T0&&S<S0&&I<I0. If the answer is "no", no action is taken; if the answer is "yes", the following step S03 is performed;

[0092] S03: further compare the values ​​collected in step S02. There are two methods for comparison:

[0093] The first method is to compare according to the following logical expression, which is T0<T<T1||S0<S<S1||I0<I<I1&&T<T1&&S<S1&&I<I1. If the answer is "no", return to step S02. If the answer is "yes", send out an early warning signal, and the operator determines whether to manually start the fire extinguishing device according to the early warning signal. If not, return to step S02. If it is started, start all the fire extinguishing devices.

[0094] The second method is to compare according to the following logical expression, which is T>T1||S>S1||I>I1. If it is "no", return to step S02. If it is "yes", trip the circuit breaker and start the corresponding fire extinguishing device. After starting the corresponding fire extinguishing device, if the collected data meets T>T3||S>S3||I>I3, start all fire extinguishing devices.

[0095] Through the above logic, rapid and effective fire extinguishing capabilities can be achieved, reducing the damage to personnel and equipment caused by fire and improving overall safety; the high fire extinguishing efficiency and harmless characteristics of the hot aerosol self-extinguishing device to the human body improve reliability.

[0096] Rapid fire extinguishing can reduce indirect losses caused by fire, such as downtime, equipment damage and data loss.

[0097] Reduce the occurrence of unknown risks and indirectly reduce complaint tickets; combine with load tracking to promptly send accident occurrences to surrounding staff; conduct timely inspections and repairs to eliminate safety hazards and further optimize the business environment.

[0098] The hot aerosol fire extinguishing device can produce a large amount of fire extinguishing aerosol in a short time and quickly extinguish the fire. The amount of hot aerosol fire extinguishing agent used is small, generally 130g / m 3 About, much lower than the amount of other gas extinguishing agents (300-1000g / m 3 ), so it has a higher fire extinguishing efficiency.

[0099] The main components of thermal aerosol fire extinguishing agents are N2, a small amount of CO2, metal salt solid particles, etc., all of which are non-toxic substances. They are harmless to the human body after use and do not contain substances that damage the atmospheric ozone layer. Their ODP (ozone depletion potential) and GWP (global warming potential) values ​​are zero, and they do not pollute the environment.

[0100] The decomposition products of thermal aerosol fire extinguishing agents will not absorb moisture in the air, and will not form conductive and corrosive electrolyte liquid films, thus avoiding damage to equipment.

[0101] The implementation methods of the present application are described in detail above in conjunction with the accompanying drawings, but the present application is not limited to the above implementation methods, and various changes can be made within the knowledge scope of ordinary technicians in the relevant technical field without departing from the purpose of the present application.

Claims

1. A thermal aerosol fire extinguishing device, comprising a thermal aerosol fire extinguisher (1), characterized in that: A plurality of thermal aerosol fire extinguishers (1) are fixed on a fixing plate (12) by means of a clamping mechanism; a discharge pipe (6) is connected through the discharge pipe (6); a plurality of branch pipes (7) are connected through the discharge pipe (6); a first electric control valve (8) is provided on the branch pipe (7); and a discharge pipe (10) with a spray hole (1001) is connected to the end of the branch pipe (7).

2. A hot aerosol fire extinguishing device according to claim 1, characterized in that: The clamping mechanism comprises a top buckle cover (2) and a discharge end buckle cover (3) connected at both ends of the hot aerosol fire extinguisher (1); the top buckle cover (2) and the discharge end buckle cover (3) are fixedly connected via a connecting screw (4); a sleeve (5) is provided on the discharge end buckle cover (3); and a discharge pipe (6) is connected to the sleeve (5).

3. A hot aerosol fire extinguishing device according to claim 2, characterized in that: The fixing plate (12) is provided with a bracket (1201), and the connecting screw (4) is threadedly connected to the threaded hole on the bracket (1201).

4. A hot aerosol fire extinguishing device according to claim 1, 2 or 3, characterized in that: The end of the branch pipe (7) is provided with an arc-shaped opening (701); the end of the ejection pipe (10) connected to the branch pipe (7) is connected with a rotating pipe (1002); the rotating pipe (1002) is connected to the arc-shaped opening (701) coaxially for rotation; and an inlet which is connected to the arc-shaped opening (701) is provided on the circumferential surface of the rotating pipe (1002); The rotating tube (1002) has a rotating shaft (1003) coaxially fixed at both ends, the branch tube (7) is sleeved with a fixed connecting sleeve (9), the connecting sleeve (9) has rotating sleeves (901) fixed on both sides, and the rotating sleeves (901) are sleeved on the rotating shaft (1003); A torsion spring (11) is connected between the rotating shaft (1003) and the connecting sleeve (9).

5. A hot aerosol fire extinguishing device according to claim 4, characterized in that: A bottom limiting plate (902) is fixed to the connecting sleeve (9) on one side of the spray hole of the spray pipe (10), and the bottom limiting plate (902) abuts against the end surface of the spray pipe (10) provided with the spray hole (1001).

6. A hot aerosol fire extinguishing device according to claim 1, 2, 3 or 5, characterized in that: A high-pressure gas tank (13) is fixed on the fixed plate (12); the outlet of the high-pressure gas tank (13) is connected to a cleaning main pipe (14); a cleaning branch pipe (15) is connected to the cleaning main pipe (14); the cleaning branch pipe (15) is connected to the discharge pipe (6); and a second electric control valve (16) is provided on the cleaning branch pipe (15).

7. A metering box block type fire extinguishing system, characterized in that: It includes a sensor device, a main control chip, a communication device and a fire extinguishing device arranged inside a single meter box. The internal module of the meter box is connected to the central control system through power line carrier communication, and the central control system communicates with the Web terminal or App software; The sensor device is mainly used to collect smoke, temperature and current signals; The main control chip is used to process the data collected by the sensor in real time and make corresponding decisions; The communication device is used to communicate with the central control system; The fire extinguishing device is controlled by the main control chip to perform fire extinguishing operations.

8. A metering box block type fire extinguishing system according to claim 7, characterized in that: The fire extinguishing device is a hot aerosol fire extinguishing device.

9. A metering box block type fire extinguishing system according to claim 7, characterized in that: The sensing devices respectively use ion type smoke sensor, K type thermocouple temperature sensor and electromagnetic current transformer.

10. A fire extinguishing method for a metering box block type fire extinguishing system, characterized in that: The following steps are involved: S01, initialize the system at the beginning, establish communication with the server, set the thresholds of various data, the temperature thresholds are T0, T1 and T3, the smoke concentration thresholds are S0, S1 and S3, and the current thresholds are I0, I1 and I3; S02, the parameters inside the metering box are detected by various sensors to obtain the values ​​T, S and I, and the values ​​are compared with the above-set thresholds to check whether T>T0&&S<S0&&I<I0. If the answer is "no", no action is taken; if the answer is "yes", the following step S03 is performed; S03: further compare the values ​​collected in step S02. There are two methods for comparison: The first method is to compare according to the following logical expression, which is T0<T<T1||S0<S<S1||I0<I<I1&&T<T1&&S<S1&&I<I1. If it is "no", it returns to step S02. If it is "yes", it sends a warning signal. The operator determines whether to manually start the fire extinguishing device according to the warning signal. If it is not turned on, it returns to step S02. If it is turned on, all fire extinguishing devices are started. The second method is to compare according to the following logical expression, which is T>T1||S>S1||I>I1. If it is "no", return to step S02. If it is "yes", trip the circuit breaker and start the corresponding fire extinguishing device. After starting the corresponding fire extinguishing device, if the collected data meets T>T3||S>S3||I>I3, start all fire extinguishing devices.

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