Gas-liquid two-fluid fire extinguishing method

Abstract

The invention provides a gas-liquid two-fluid fire extinguishing method, which belongs to the technical field of fire prevention and control, and comprises the following steps: adjusting the vertical position of a spraying pipe orifice in a fire extinguishing agent bottle based on the fire scene requirement of a protection area; the first fluid is sprayed out from the spraying pipe orifice, flows through the output pipe at the output end of the fire extinguishing agent bottle and is finally conveyed to the double-fluid spray head; the first fluid is scattered by an insertion core at the front end of a main runner of the double-fluid spray head, then is conveyed to a plurality of sub-runners in the spray head body, and is sprayed outwards along the sub-runners in a divergent manner; as the first fluid is sprayed out along the fire extinguishing agent bottle, the second fluid is in contact with the spraying pipe orifice, is sprayed out from the spraying pipe orifice and flows through the output end of the fire extinguishing agent bottle output pipe; according to the invention, an innovative fire extinguishing mode of firstly spraying water mist for cooling and then spraying nitrogen for suffocation is adopted, in the initial stage of fire extinguishing, nitrogen is pressurized in the bottle to press out water, the water mist is formed through the double-fluid spray head, and the local temperature of a fire source is rapidly reduced and the fire behavior development is effectively inhibited by utilizing the efficient heat absorption characteristic of the water mist.

Description

Technical Field

[0001] The present invention relates to the technical field of fire prevention and control, and in particular to a gas-liquid dual-fluid fire extinguishing method. Background Art

[0002] In the field of firefighting, fires are diverse and pose significant risks, and traditional fire extinguishing systems have limitations when dealing with some complex fire scenarios. Existing firefighting technologies often struggle to effectively address multiple fire types with a single extinguishing agent. Furthermore, the extinguishing process can suffer from low extinguishing efficiency, significant water damage, or poor suitability for specific fires. For example, for some electrical and oil fires, conventional water-based extinguishing systems pose a risk of electric shock and reignition, while gas-based extinguishing systems are ineffective at reducing the temperature.

[0003] Traditional single-agent fire extinguishing systems struggle to meet the demands of modern fire prevention and control. For example, while water-based fire extinguishing systems are somewhat effective against common solid fires, the immiscible nature of water and oil can cause oil droplets to splatter when used on oil fires, exacerbating the spread of the fire. Furthermore, due to the electrical conductivity of water, using water-based fire extinguishing systems in electrical fires can easily lead to electric shock hazards, posing a significant threat to personnel safety. While dry powder fire extinguishing systems can suppress fires quickly, they leave behind a large amount of difficult-to-clean dry powder residue. This residue not only seriously contaminates equipment and the environment but can also permanently damage precision instruments and electronic equipment, affecting their proper operation. While carbon dioxide (CO2) fire extinguishing systems, a gas-based fire extinguishing system, offer advantages in extinguishing electrical fires, the low-temperature properties of CO2 can damage temperature-sensitive equipment during extinguishing, and its effectiveness is significantly impacted in high-temperature environments. In addition, some traditional fire extinguishing agents, such as halons, have gradually been restricted by the international community due to their destructive effects on the ozone layer, which further highlights the urgency of developing new fire extinguishing technologies.

[0004] Among existing fire-extinguishing technologies, one type is gas fire-extinguishing systems, represented by HFC-227ea and nitrogen fire-extinguishing systems. HFC-227ea fire-extinguishing systems, with their high fire-extinguishing performance and ability to quickly suppress combustion reactions, are widely used in locations with high cleanliness and equipment protection requirements, such as data centers and communications rooms. However, HFC-227ea has a high global warming potential (GWP), posing a potential threat to global climate change and incompatible with current sustainable environmental protection concepts. Furthermore, HFC-227ea fire-extinguishing systems are relatively expensive and have strict storage and maintenance requirements, which to some extent limit their large-scale application. Nitrogen fire-extinguishing systems utilize nitrogen's inertness to extinguish fires by diluting the oxygen concentration. As a widely present gas in the atmosphere, nitrogen is abundant, inexpensive, and environmentally friendly. Therefore, it is used in locations with stringent environmental requirements, such as underground coal mines and grain warehouses. However, nitrogen fire-extinguishing systems are relatively slow, making it difficult to effectively control the spread of rapidly spreading fires in a short period of time. Moreover, in some places with large spaces and complex ventilation conditions, nitrogen is difficult to be evenly distributed to every corner, resulting in unstable fire extinguishing effect.

[0005] like Figure 7 Another type of dual-fluid fire extinguishing device is a combination of gas and water, using the gas pressure to eject water from a nozzle to extinguish a fire. However, these devices suffer from numerous drawbacks in practical application. First, the lack of a precise control mechanism during the mixing of gas and water makes it difficult to precisely adjust the gas-water ratio. Different fire types require different gas-water mixing ratios, and existing simple dual-fluid fire extinguishing devices cannot flexibly adjust the ratio based on the actual fire situation, resulting in low fire extinguishing efficiency. Second, the nozzle design of these devices is not scientifically sound, and they are unable to fully atomize the water into a fine mist. Fine water mist has a larger surface area than ordinary water droplets, effectively absorbing heat and isolating oxygen, thereby improving fire extinguishing effectiveness. However, existing nozzles cannot produce a fine mist of the ideal particle size, resulting in a small fire extinguishing coverage area and insufficient penetration into the fire source, making it difficult to extinguish a fire deep within the burning area. This is particularly problematic for fires hidden inside or deep within objects, where effective extinguishing is lacking. Furthermore, simple dual-fluid fire extinguishing devices present significant issues with system stability. In complex environmental conditions, such as high temperatures, humidity, and the presence of corrosive gases, device components are easily damaged, leading to frequent system failures and an inability to ensure reliable firefighting. Once a system failure occurs during a fire, it will seriously affect the timeliness and effectiveness of firefighting, causing irreparable losses. Summary of the Invention

[0006] The present invention provides a gas-liquid dual-fluid fire extinguishing method, which stores nitrogen and water in a specific ratio in the same tank. The internal storage pressure is adopted, and the nitrogen is used as the driving source to spray water. The water is broken up at the dual-fluid nozzle to form a fine water mist, which can quickly reduce the temperature of the fire source and achieve efficient cooling and fire extinguishing. After the water in the tank is sprayed, the nitrogen continues to spray out due to its own pressure. The sprayed nitrogen can dilute the oxygen concentration and play a role in suffocating the fire. This dual-fluid collaborative fire extinguishing method can not only effectively extinguish Class A, Class B, Class C and electrical equipment fires, expand the scope of fire extinguishing application, but also reduce the use of a single fire extinguishing agent, reduce water damage and damage to equipment after fire extinguishing, and improve fire extinguishing efficiency, providing a more reliable, efficient and environmentally friendly fire extinguishing solution for various factories, public places, etc.

[0007] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0008] A gas-liquid dual-fluid fire extinguishing method comprises the following steps:

[0009] Based on the fire scenario requirements of the protection area, the gas-liquid ratio is precisely controlled, and the discharge nozzle is adjusted to the vertical position of the fire extinguishing agent bottle;

[0010] The first fluid is ejected from the ejection pipe orifice, flows through the output pipe at the output end of the fire extinguishing agent bottle, and is finally delivered to the dual-fluid nozzle;

[0011] The first fluid is dispersed by the insert at the front end of the main channel of the dual-fluid nozzle and then transported to multiple sub-channels in the nozzle body, and then sprayed outward in a divergent shape along the sub-channels;

[0012] As the first fluid is ejected along the fire extinguishing agent bottle, the second fluid contacts the ejection nozzle and is ejected from the ejection nozzle, flows through the output end of the output pipe of the fire extinguishing agent bottle, and is finally delivered to the dual-fluid nozzle;

[0013] The second fluid is guided by the insert core of the dual-fluid nozzle and transported to the multiple sub-flow channels at the rear end of the nozzle body, and is sprayed outward in a divergent shape along the sub-flow channels.

[0014] Preferably, the step of adjusting the discharge nozzle to the vertical position of the fire extinguishing agent bottle based on the fire scene requirements of the protection area and accurately controlling the gas-liquid ratio includes the following steps:

[0015] When facing a fire that spreads rapidly, adjust the nozzle to the gas layer of the fire extinguishing agent bottle;

[0016] When there are a large amount of flammable liquids or high-temperature equipment in the protection area, adjust the spray nozzle to the liquid layer of the fire extinguishing agent bottle.

[0017] Preferably, when there is a large amount of flammable liquid or high-temperature equipment in the protection area, the step of adjusting the discharge nozzle to be located at the liquid layer of the fire extinguishing agent bottle includes the following steps:

[0018] When facing electrical fire protection, the gas medium content in the fire extinguishing agent bottle can be controlled to be greater than the liquid content;

[0019] When protecting against oil fires, the liquid medium content in the fire extinguishing agent bottle can be controlled to be greater than the gas content.

[0020] Preferably, the output end of the fire extinguishing agent bottle is connected to an output pipe, the end of the output pipe away from the fire extinguishing agent bottle is connected to a high-pressure hose, the end of the high-pressure hose away from the output pipe is connected to a collecting pipe, and the end of the collecting pipe away from the high-pressure hose is connected to a dual-fluid nozzle.

[0021] Preferably, a pilot valve is provided on the pipeline of the output pipe close to the outlet of the fire extinguishing agent bottle, and a pressure release pipe is provided on the pipeline of the output pipe away from the outlet of the fire extinguishing agent bottle, and a bursting disc and a safety valve are respectively provided on two opposite sides of the pressure release pipe.

[0022] Preferably, a pressure gauge is provided on the end of the output pipe away from the pressure release pipe, a one-way valve is provided on the pipeline of the high-pressure hose away from the end of the output pipe, and a safety relief device, a signal feedback device and a pressure reducing device are provided in sequence on the pipeline of the collecting pipe away from the high-pressure hose.

[0023] Preferably, the dual-fluid nozzle includes a connector connected to the manifold and a nozzle body integrally formed at one end of the connector, the connector and the nozzle body are provided with a main channel communicating with the manifold, the insert is arranged on the inner wall of the main channel of the connector close to the nozzle body, and the sub-channels are arranged in multiple groups axially distributed along the inner wall of the main channel in the nozzle body.

[0024] Preferably, the insert includes a diamond-shaped vertical plate, a first guide plate extending vertically outward from a side corner of the diamond-shaped vertical plate to form a fan-shaped structure, and a second guide plate extending vertically outward from the other side corner of the diamond-shaped vertical plate to form a fan-shaped structure, wherein the first guide plate and the second guide plate are cross-arranged, and both the first guide plate and the second guide plate are provided with drainage grooves.

[0025] Preferably, each group of sub-flow channels is tangent to the cylindrical surface of the inner wall of the main flow channel, and the sub-flow channels of the same group are located in the same plane perpendicular to the axis of the main flow channel.

[0026] Preferably, a trumpet-shaped nozzle is provided at one end of the sub-flow channel away from the main flow channel, and the size of the nozzle gradually increases in a direction away from the sub-flow channel.

[0027] It can be seen from the above technical solutions that the present invention has the following beneficial effects:

[0028] 1. In the present invention, a unique method of nitrogen-fine water mist dual fluid is used to perform fire extinguishing operations. Its core advantage is that it can flexibly adjust the use strategy of fire extinguishing agents according to the needs of various fire scenarios. On the one hand, by accurately controlling the spraying order of nitrogen and fine water mist, the fire extinguishing efficiency is maximized. For example, when facing a fire that spreads rapidly and rapidly, nitrogen can be sprayed first, and its characteristic of quickly reducing the oxygen concentration around the fire point can be used to quickly curb the spread of the fire in the early stage of the fire, thereby buying valuable time for subsequent fire-fighting operations; and when there are a large number of flammable liquids or high-temperature equipment at the fire scene and there is an urgent need for cooling, fine water mist is sprayed first. With the powerful cooling capacity of fine water mist, it quickly absorbs heat, reduces the temperature of the fire point, and effectively suppresses the further development of the fire. On the other hand, by accurately adjusting the ratio of nitrogen and water, this method can effectively deal with different types of fires. For electrical fires, appropriately increasing the nitrogen ratio can extinguish the fire while reducing potential secondary damage to electrical equipment due to water's conductivity. For oil fires, rationally increasing the water ratio allows the fine water mist to not only cool the fire but also effectively suppress the volatilization of oil vapor, thereby more efficiently extinguishing the fire. This fire extinguishing method, based on spray sequence and ratio control, greatly improves the targetedness and effectiveness of fire extinguishing, providing a practical and efficient solution for extinguishing various complex fires.

[0029] 2. In the present invention, the fire extinguishing agent bottle is the core component, with water stored in the lower layer and nitrogen stored in the upper layer, adopting an internal pressure storage structure. The pilot valve is installed at the outlet of the fire extinguishing agent bottle to control the outflow of the medium in the bottle; the bursting disc and the safety valve are installed in parallel on the pipeline after the pilot valve for overpressure protection; the pressure gauge is installed on the pipeline near the bursting disc and the safety valve to monitor the pressure in real time; the high-pressure hose is connected after the pressure gauge to ensure stable medium delivery; the one-way valve is installed after the high-pressure hose to prevent medium backflow; the manifold collects the medium flowing out of multiple fire extinguishing agent bottles; the safety relief device and the pressure reducing device are installed in sequence after the manifold for overpressure relief and pressure regulation respectively; the signal feedback device is installed after the pressure reducing device to feedback the working status of the system; the nozzle is installed in the protection area to realize the sequential injection of nitrogen and fine water mist. The combination of these components and their functions give this fire extinguishing system the following characteristics: 1). Nitrogen and water are innovatively stored in the same container, using an internal pressure storage method. Compared with traditional systems, this system reduces the need for storage equipment, has a compact structure, and saves space and costs. 2). The various components of the system work together to achieve complete functions from fire extinguishing agent storage and delivery to injection and system status monitoring. 3). By adjusting the parameters of related components (such as pressure reducing devices, signal feedback devices, etc.) according to the fire characteristics and needs of different protection zones, it can flexibly adapt to various fire extinguishing scenarios.

[0030] 3. The unique design of the dual-fluid nozzle in this invention allows the delivered fluid to be dispersed within the nozzle and then ejected through a specific nozzle orifice structure. The nozzle is constructed of materials with excellent corrosion resistance and mechanical strength to withstand the chemical corrosion and pressure of gas and liquid flow in firefighting environments. Through a secure connection to the delivery pipeline and installation at a specific location within the protected area, it ensures stable delivery of gas and liquid to the nozzle and effective spraying, achieving highly efficient fire extinguishing performance.

[0031] 4. In the present invention, the output ends of the fire extinguishing agent bottles are respectively connected to the output pipe, the high-pressure hose and the manifold. Such gas-liquid delivery pipelines serve as the channels connecting the fire extinguishing agent bottles and the nozzles, and are tightly connected to the fire extinguishing agent bottles, the nozzles and other related components. The pipeline connections are made by welding or special pipe fittings, which have good air tightness and pressure bearing capacity, and effectively prevent gas and liquid leakage. The layout of the pipelines has been optimized and designed, with reasonable planning of directions and angles to reduce the resistance to gas and liquid flow, ensuring that the gas and liquid can be smoothly and stably delivered from the fire extinguishing agent bottles to the nozzles, providing reliable delivery guarantees for the efficient operation of the fire extinguishing system. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 A system diagram of the gas-liquid dual-fluid fire extinguishing method of the present invention;

[0033] Figure 2 It is a schematic diagram of a fire extinguishing agent bottle and its components;

[0034] Figure 3 Schematic diagram of the structure of a dual-fluid nozzle;

[0035] Figure 4 for Figure 3 Schematic diagram of the AA section;

[0036] Figure 5 Schematic diagram of the structure of the ferrule;

[0037] Figure 6 is a three-dimensional schematic diagram of the ferrule;

[0038] Figure 7 It is a schematic diagram of an existing dual-fluid fire extinguishing device.

[0039] In the figure: 10, fire extinguishing agent bottle; 20, output pipe; 210, pilot valve; 220, pressure relief pipe; 221, bursting disc; 222, safety valve; 230, pressure gauge; 30, high-pressure hose; 310, one-way valve; 40, collecting pipe; 410, safety relief device; 420, signal feedback device; 430, pressure reducing device; 50, dual-fluid nozzle; 510, connector; 520, nozzle body; 530, main channel; 540, insert; 541, diamond-shaped vertical plate; 542, first guide plate; 543, second guide plate; 544, drainage groove; 550, sub-channel; 551, nozzle; 552, sub-channel outlet. DETAILED DESCRIPTION

[0040] A preferred embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

[0041] To achieve the above objectives, the embodiments of the present invention adopt the following technical solutions: Figure 1 、 Figure 2 , a gas-liquid dual-fluid fire extinguishing method, comprising the following steps:

[0042] S10: Based on the fire scenario requirements of the protection area, accurately control the gas-liquid ratio and adjust the discharge nozzle to the vertical position of the fire extinguishing agent bottle.

[0043] Specifically, in this embodiment, nitrogen is used as the gas and water is used as the liquid. When in use, the ratio between gas and liquid is precisely controlled based on the usage requirements of different fire scenarios in the protection zone, and the outlet nozzle is adjusted to the vertical position of the fire extinguishing agent bottle. In this embodiment, the outlet nozzle is in the water layer.

[0044] S20: The first fluid is ejected from the ejection pipe orifice, flows through the output pipe at the output end of the fire extinguishing agent bottle, and is finally delivered to the dual-fluid nozzle.

[0045] Specifically, when a fire occurs and needs to be extinguished, the upper layer of high-pressure nitrogen in the fire extinguishing agent bottle serves as a driving gas source to first drive the first fluid to be ejected, specifically, to press out the water in the lower layer. In this way, the water flows through the output pipe at the output end of the fire extinguishing agent bottle and is transported to the dual-fluid nozzle through the collecting pipe.

[0046] S30: The first fluid is dispersed by the insert at the front end of the main channel of the dual-fluid nozzle and then transported to the multiple sub-channels in the nozzle body, and is sprayed outward in a divergent shape along the sub-channels.

[0047] Specifically, when the first fluid (i.e., water) flows through the dual-fluid nozzle, the insert located at the front end of the dual-fluid nozzle will obstruct the water and disperse the flowing water. The dispersed water continues to be transported into the nozzle body along the main channel and is sprayed outward in a divergent shape along the sub-channel.

[0048] S40: As the first fluid is sprayed out along the fire extinguishing agent bottle, the second fluid contacts the spraying nozzle and is sprayed out from the spraying nozzle, flows through the output end of the fire extinguishing agent bottle output pipe, and is finally delivered to the dual-fluid nozzle.

[0049] Specifically, as the first fluid (i.e., water) is sprayed out along the fire extinguishing agent bottle, only the second fluid (i.e., nitrogen) remains in the fire extinguishing agent bottle. The second fluid contacts the discharge pipe orifice and is sprayed outward from the discharge pipe orifice, and then flows through the manifold to the dual-fluid nozzle.

[0050] S50: The second fluid is guided by the insert of the dual-fluid nozzle and transported to the multiple sub-flow channels at the rear end of the nozzle body, and is sprayed outward in a divergent shape along the sub-flow channels.

[0051] Specifically, the second fluid flowing through the dual-fluid nozzle first contacts the insert inside the dual-fluid nozzle, is dispersed by the insert, and is transported to the sub-flow channel at the rear end of the nozzle body, and is sprayed outward in a divergent shape along the sub-flow channel to achieve a fire extinguishing concentration in the closed protection area, reduce the oxygen content, and achieve asphyxiation fire extinguishing.

[0052] The present invention adopts an innovative fire extinguishing method of first spraying fine water mist for cooling and then spraying nitrogen for asphyxiation. In the initial stage of fire extinguishing, the pressurized nitrogen in the bottle presses out the water, forming a fine water mist through the dual-fluid nozzle. The efficient heat absorption characteristics of the fine water mist are utilized to rapidly reduce the local temperature of the fire source and effectively suppress the development of the fire. When the water in the storage container is transported, the remaining nitrogen in the bottle continues to be sprayed out through the nozzle by relying on its own pressure, reaching a fire extinguishing concentration in the closed protection area, reducing the oxygen content and achieving asphyxiation fire extinguishing. This nitrogen-water mist gas-liquid two-phase synergistic fire extinguishing method fully utilizes the advantages of the two fire extinguishing agents. Compared with the fire extinguishing with a single fire extinguishing agent, it significantly improves the fire extinguishing efficiency and can more effectively deal with various fire scenes, such as electrical fires, oil fires, etc. During the entire fire extinguishing process, through the close coordination of the above-mentioned links, this gas-liquid dual-fluid fire extinguishing method utilizes the synergistic effect of nitrogen and water, first using fine water mist for liquid phase cooling, and then using nitrogen for gas phase asphyxiation extinguishing, to achieve the effect of gas-liquid two-phase synergistic fire extinguishing, which can effectively deal with various fires, improve fire extinguishing efficiency, and reduce fire losses.

[0053] Reference Figure 2 As a preferred technical solution of this embodiment, the step of adjusting the vertical position of the discharge nozzle to the fire extinguishing agent bottle and accurately controlling the gas-liquid ratio based on the fire scene requirements of the protection area includes the following steps:

[0054] S110: When facing a fire that spreads rapidly, adjust the outlet of the nozzle to the gas layer of the fire extinguishing agent bottle.

[0055] Specifically, it should be noted that the ejection nozzle in the gas-liquid dual-fluid fire extinguishing method is not limited to being placed in the water layer as mentioned above. When facing a fire that spreads rapidly and fiercely, the ejection nozzle is adjusted to be in the gas layer of the fire extinguishing agent bottle. In this way, at the beginning, the first fluid ejected from the fire extinguishing agent bottle is nitrogen, so as to utilize the characteristic of nitrogen to quickly reduce the oxygen concentration around the fire point, quickly curb the spread of the fire in the early stage of the fire, and gain valuable time for subsequent fire extinguishing operations.

[0056] S120: When there are large amounts of flammable liquids or high-temperature equipment in the protected area, adjust the nozzle to be at the liquid layer of the fire extinguishing agent bottle.

[0057] Specifically, when there are a large number of flammable liquids or high-temperature equipment at the fire scene and there is an urgent need for cooling, fine water mist is sprayed first. With the powerful cooling ability of fine water mist, it quickly absorbs heat, reduces the temperature of the fire point, and effectively suppresses the further development of the fire. At this time, the spray nozzle is in the liquid layer of the fire extinguishing agent bottle.

[0058] Furthermore, when there is a large amount of flammable liquid or high-temperature equipment in the protection area, the step of adjusting the discharge nozzle to be located at the liquid layer of the fire extinguishing agent bottle includes the following steps:

[0059] S121: When facing electrical fire protection, the gas medium content in the fire extinguishing agent bottle can be controlled to be greater than the liquid content.

[0060] Specifically, this gas-liquid dual-fluid fire extinguishing method can not only accurately control the spraying order of nitrogen and fine water mist, but also accurately adjust the ratio of nitrogen and water. By accurately adjusting the ratio of nitrogen and water, it can effectively respond to different types of fires. That is, for electrical fires, the nitrogen ratio can be appropriately increased, so as to reduce the secondary damage to electrical equipment caused by the conductivity of water while extinguishing the fire.

[0061] S122: When protecting against oil fires, the liquid medium content in the fire extinguishing agent bottle can be controlled to be greater than the gas content.

[0062] Specifically, when facing an oil fire, reasonably increasing the proportion of water, the fine water mist can not only play a cooling role, but also effectively suppress the volatilization of oil vapor, thereby extinguishing the fire more efficiently.

[0063] This fire extinguishing method based on spray sequence and proportional control greatly improves the targetedness and effectiveness of fire extinguishing, and provides a practical and efficient solution for extinguishing various complex fires.

[0064] Reference Figure 1 、 Figure 2The fire extinguishing agent bottle 10, as the core component for storing nitrogen and water, is located at the starting end of the entire device. The output ends of the fire extinguishing agent bottle 10 are respectively connected to the output pipe, the high-pressure hose and the collecting pipe. This type of gas-liquid delivery pipeline serves as a channel connecting the fire extinguishing agent bottle and the nozzle, and is tightly connected to the fire extinguishing agent bottle, the nozzle and other related components. The pipeline connection adopts welding or special pipe fittings, which has good air tightness and pressure bearing capacity, and effectively prevents gas and liquid leakage. The layout of the pipeline has been optimized and designed, and the direction and angle are reasonably planned to reduce the gas-liquid flow resistance, ensure that the gas and liquid can be smoothly and stably transported from the fire extinguishing agent bottle to the nozzle, and provide reliable transportation guarantee for the efficient operation of the fire extinguishing system. The pilot valve 210 is installed at the outlet of the fire extinguishing agent bottle, and ensures the reliability of sealing and opening through a specific connection method, which is used to control the outflow of the medium in the fire extinguishing agent bottle. The bursting disc 221 and the safety valve 222 are installed in parallel on the pipeline after the outlet of the pilot valve 210. The bursting disc 221 is installed on the pressure relief pipeline 220. When the system pressure rises abnormally and reaches the bursting pressure, the bursting disc 221 will quickly rupture and release the pressure to ensure the safety of the system; the safety valve 222 will automatically open to release the pressure when the pressure exceeds the set value, and automatically close after the pressure returns to normal. Its opening and closing pressures are precisely set, and it is ensured that it is firmly connected to the pipeline and well sealed during installation.

[0065] Pressure gauge 230 is installed on the pipeline near bursting disc 221 and safety valve 222. It connects to the pipeline via appropriate connecting fittings, allowing real-time monitoring of pipeline pressure. A high-pressure hose 30 is connected after pressure gauge 230. Its flexibility allows the system to accommodate certain displacement and deformation during installation and operation, ensuring stable medium delivery. A one-way valve 310 is installed in the pipeline after high-pressure hose 30 to ensure one-way flow of the medium and prevent backflow.

[0066] The manifold 40 is used to collect the medium flowing out of multiple fire extinguishing agent bottles 10. It is installed on the pipeline after the one-way valve 310, and the connection with each pipeline ensures sealing and pressure bearing capacity. The safety relief device 410 and the pressure reducing device 430 are installed in sequence on the pipeline after the manifold 40. The safety relief device 410 is used to release the pressure when the system pressure exceeds the safety range, and the pressure reducing device 430 adjusts the medium pressure to a suitable value to meet the working requirements of the nozzle. The signal feedback device 420 is installed on the pipeline after the pressure reducing device 430 and can provide real-time feedback on the working status information of the system. The dual-fluid nozzle 50 is installed in the protection area and, through the connection with the pipeline, realizes the successive spraying of fine water mist and nitrogen to extinguish the fire in the protection area. Through the reasonable installation and connection of various components, the functions of storage, transportation, pressure control and injection of fire extinguishing agent are realized. At the same time, the working status of the system can be monitored in real time to ensure stable and reliable operation of the system.

[0067] The top of the bottle is equipped with a pressure gauge, bursting disc, safety valve, and pilot valve. The pressure gauge is connected to the bottle interior via a connecting pipe and is used to monitor the pressure inside the bottle in real time. Its mounting position allows for easy viewing and reading. The bursting disc is installed in the pressure relief pipe. When the pressure inside the bottle rises abnormally and reaches the bursting pressure of the bursting disc, it ruptures, rapidly releasing the excessive pressure inside the bottle and ensuring the safety of the bottle. The safety valve also controls the pressure inside the bottle. Its opening and closing pressures are precisely set. During installation, it is important to ensure a secure connection to the bottle and a good seal. When the pressure inside the bottle exceeds the opening pressure of the safety valve, the safety valve automatically opens to relieve pressure and automatically closes when the pressure returns to normal. The pilot valve is installed at the outlet of the bottle, with a specific connection method to ensure reliable opening and closing, and is used to control the outflow of the medium inside the bottle. These components work together to monitor and control the pressure inside the fire extinguishing agent bottle in real time, ensuring the safety of the bottle during normal operation and abnormal conditions, while also effectively controlling and releasing the fire extinguishing agent inside the bottle.

[0068] In some embodiments, reference Figure 3 、 Figure 4 The dual-fluid nozzle 50 includes a connector 510 and a nozzle body 520. The connector is threadedly connected to the manifold 40. The nozzle body 520 and the connector 510 are integrally formed, and the nozzle body is located at one end of the connector away from the manifold. Further, the connector and the nozzle body are provided with a main flow channel 530 communicating with the manifold. The insert 540 is provided on the inner wall of the main flow channel 530 of the connector 510 close to the nozzle body 520. A sub-flow channel 520 is provided in the inner cavity of the nozzle body 520. The sub-flow channel 520 is close to the inner circular side of the main flow channel 530. The cylindrical surface is provided with a sub-channel opening 552, and the sub-channels 550 are arranged in multiple groups, and the multiple groups of sub-channels 550 are axially spaced and distributed along the inner wall of the main channel 530 in the nozzle body 520. When in use, when the water is transported to the main channel 530 through the collecting pipe 40, it can be broken up into a fine water mist through the insert 540, and continue to be transported along the nozzle body 520, and finally transported outward in a divergent manner through the sub-channel 550; similarly, when nitrogen is transported along the main channel 530, it can also be guided and diverged by the insert 540, and then sprayed outward in a divergent form through the sub-channel 550.

[0069] It should be noted that the nozzles are manufactured from materials with excellent corrosion resistance and mechanical strength to withstand the chemical corrosion and pressure of gas and liquid flow in firefighting environments. They are securely connected to the delivery pipeline and installed in a specific location within the protected area to ensure stable gas and liquid delivery to the nozzles and effective spraying, achieving efficient fire extinguishing performance.

[0070] Reference Figure 5 、 Figure 6Furthermore, the insert 540 includes a diamond-shaped vertical plate 541, a first guide plate 542 and a second guide plate 543. The first guide plate 542 extends vertically outward from one side corner of the diamond vertical plate 541 to form a fan-shaped structure, and the second guide plate 543 extends vertically outward from the other side corner of the diamond vertical plate 541 to form a fan-shaped structure, wherein the first guide plate 542 and the second guide plate 543 are arranged in a cross structure, and a drainage groove 544 is provided on the first guide plate and the second guide plate. When in use, the diamond vertical plate, the first guide plate and the second guide plate form an integrated structure and are clamped and fixed to the inner wall of the main channel. In this way, the liquid or gas transported through the manifold can be divided into two paths and transported to the rear under the separation effect of the diamond vertical plate, and when transported to the first guide plate and the second guide plate, the liquid or gas is dispersed and drained by the guide plate body, the fluid is dispersed and the dispersed fluid is guided to the nozzle body, and finally sprayed out through the sub-channel on the nozzle body.

[0071] Specifically, when the ferrule is connected to the main channel, an annular slot can be opened on the inner wall of the main channel. When in use, the two diagonal corners of the diamond-shaped vertical plate are engaged in the slot to fix the ferrule.

[0072] Further, refer to Figure 4 Each group of sub-flow channels 550 is arranged tangent to the cylindrical surface of the inner wall of the main flow channel 530. The multiple sub-flow channels 550 of the same group are located in the same plane perpendicular to the axis of the main flow channel, and the multiple sub-flow channels of the same group are distributed in a divergent form along the cylindrical surface of the inner wall of the main flow channel. At the same time, a trumpet-shaped nozzle 551 is provided at one end of the sub-flow channel away from the main flow channel, and the size of the nozzle gradually expands in the direction away from the sub-flow channel. In this way, the fluid transported to the sub-flow channel through the main flow channel can be dispersed outward along the divergent sub-flow channel and sprayed using a trumpet-shaped nozzle, ensuring that the fluid can form a local conical envelope tightly distributed along the periphery of the nozzle body after injection, effectively controlling the fluid distribution area, and ensuring the uniformity and efficiency of the fluid distribution during the fire extinguishing process.

[0073] When a fire breaks out and requires extinguishing, the pilot valve opens, using the high-pressure nitrogen in the upper chamber of the extinguishing agent cylinder as the driving air source to force out the water in the lower chamber. Water flows through a pipe and a check valve into a manifold. A safety relief device monitors the pressure in real time and, if the pressure rises abnormally, initiates an overpressure relief. A pressure reducing device adjusts the water pressure to an appropriate level to meet the requirements of the subsequent dual-fluid sprinkler operation. The pressure-regulated water is delivered through the manifold to the dual-fluid sprinkler, where it is dispersed into a fine mist by the insert in the main flow channel, cooling the fire. The efficient heat absorption of the mist rapidly reduces the local temperature of the fire source, effectively suppressing the spread of the fire. Once the water in the extinguishing agent cylinder has been completely exhausted, only nitrogen remains in the cylinder, maintaining system pressure. This nitrogen is then discharged through the manifold and from the same dual-fluid sprinkler, reaching a fire-extinguishing concentration within the enclosed protection zone, reducing the oxygen content and suffocating the fire. Throughout the firefighting process, a signal feedback device provides real-time feedback on the system's operating status, and a pressure gauge continuously monitors the system pressure, providing operators with accurate information so they can make necessary adjustments based on the actual situation. Through the close coordination of the above-mentioned links, the nitrogen-fine water mist dual-fluid fire extinguishing system utilizes the synergistic effect of nitrogen and water, first cooling the liquid phase through fine water mist, and then suffocating the fire in the gas phase through nitrogen, achieving the effect of gas-liquid two-phase coordinated fire extinguishing. It can effectively respond to various types of fires, improve fire extinguishing efficiency, and reduce fire losses.

[0074] The above-described embodiments are merely descriptions of preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should fall within the scope of protection determined by the claims of the present invention.

Claims

1. A gas-liquid dual-fluid fire extinguishing method, characterized in that: The following steps are involved: Based on the fire scenario requirements of the protection area, the gas-liquid ratio is precisely controlled, and the discharge nozzle is adjusted to the vertical position of the fire extinguishing agent bottle; The first fluid is ejected from the ejection pipe orifice, flows through the output pipe at the output end of the fire extinguishing agent bottle, and is finally delivered to the dual-fluid nozzle; The first fluid is dispersed by the insert at the front end of the main channel of the dual-fluid nozzle and then transported to multiple sub-channels in the nozzle body, and then sprayed outward in a divergent shape along the sub-channels; As the first fluid is ejected along the fire extinguishing agent bottle, the second fluid contacts the ejection nozzle and is ejected from the ejection nozzle, flows through the output end of the output pipe of the fire extinguishing agent bottle, and is finally delivered to the dual-fluid nozzle; The second fluid is guided by the insert core of the dual-fluid nozzle and transported to the multiple sub-flow channels at the rear end of the nozzle body, and is sprayed outward in a divergent shape along the sub-flow channels.

2. The gas-liquid dual-fluid fire extinguishing method according to claim 1, characterized in that: The step of adjusting the discharge nozzle to the vertical position of the fire extinguishing agent bottle based on the fire scene requirements of the protection area and accurately controlling the gas-liquid ratio includes the following steps: When facing a fire that spreads rapidly, adjust the nozzle to the gas layer of the fire extinguishing agent bottle; When there are a large amount of flammable liquids or high-temperature equipment in the protection area, adjust the spray nozzle to the liquid layer of the fire extinguishing agent bottle.

3. The gas-liquid dual-fluid fire extinguishing method according to claim 2, characterized in that: When there is a large amount of flammable liquid or high-temperature equipment in the protection area, the step of adjusting the discharge nozzle to be at the liquid layer of the fire extinguishing agent bottle includes the following steps: When facing electrical fire protection, the gas medium content in the fire extinguishing agent bottle can be controlled to be greater than the liquid content; When protecting against oil fires, the liquid medium content in the fire extinguishing agent bottle can be controlled to be greater than the gas content.

4. The gas-liquid dual-fluid fire extinguishing method according to claim 1, characterized in that: The output end of the fire extinguishing agent bottle is connected to an output pipe, the end of the output pipe away from the fire extinguishing agent bottle is connected to a high-pressure hose, the end of the high-pressure hose away from the output pipe is connected to a collecting pipe, and the end of the collecting pipe away from the high-pressure hose is connected to a dual-fluid nozzle.

5. The gas-liquid dual-fluid fire extinguishing method according to claim 4, characterized in that: A pilot valve is provided on the pipeline of the output pipe close to the outlet of the fire extinguishing agent bottle, and a pressure release pipeline is provided on the pipeline of the output pipe away from the outlet of the fire extinguishing agent bottle. A bursting disc and a safety valve are respectively provided on two opposite sides of the pressure release pipeline.

6. The gas-liquid dual-fluid fire extinguishing method according to claim 5, characterized in that: A pressure gauge is provided on the end of the output pipe away from the pressure release pipe, a one-way valve is provided on the pipeline of the high-pressure hose away from the end of the output pipe, and a safety relief device, a signal feedback device and a pressure reducing device are provided in sequence on the pipeline of the collecting pipe away from the high-pressure hose.

7. The gas-liquid dual-fluid fire extinguishing method according to claim 1, characterized in that: The dual-fluid nozzle includes a connector connected to a manifold and a nozzle body integrally formed at one end of the connector. A main flow channel communicating with the manifold is provided inside the connector and the nozzle body. The insert is provided on the inner wall of the main flow channel of the connector close to the nozzle body. The sub-flow channels are provided in multiple groups axially distributed along the inner wall of the main flow channel in the nozzle body.

8. The gas-liquid dual-fluid fire extinguishing method according to claim 7, characterized in that: The insert includes a diamond-shaped vertical plate, a first guide plate extending vertically outward from a side corner of the diamond-shaped vertical plate to form a fan-shaped structure, and a second guide plate extending vertically outward from the other side corner of the diamond-shaped vertical plate to form a fan-shaped structure, wherein the first guide plate and the second guide plate are arranged crosswise, and both the first guide plate and the second guide plate are provided with a drainage groove.

9. The gas-liquid dual-fluid fire extinguishing method according to claim 8, characterized in that: Each group of sub-flow channels is tangent to the cylindrical surface of the inner wall of the main flow channel, and the sub-flow channels of the same group are located in the same plane perpendicular to the axis of the main flow channel.

10. The gas-liquid dual-fluid fire extinguishing method according to claim 9, characterized in that: A trumpet-shaped nozzle is provided at one end of the sub-flow channel away from the main flow channel, and the size of the nozzle gradually increases in a direction away from the sub-flow channel.

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