An automatic fire extinguishing device

Abstract

The utility model provides an automatic fire extinguishing device, including casing and spray head subassembly. When using, the automatic fire extinguishing device is hung in the upper portion of the protection space, when having the ignition point in the protection space and temperature reaches the set value, the heat sensitive element will be deformed, and the bursting disc loses the support of the heat sensitive element, the pressure sealed in the upper portion of the bursting disc is released, and the bursting disc breaks under the pressure effect in the inside of the casing, and the heat sensitive element is pushed to move downward, opens the passageway of spray head joint and spray head shell, makes the fire extinguishing agent spray from the spray opening through spray head joint and spray head shell, and realizes fire extinguishing. The utility model discloses a heat sensitive element is used to support the bursting disc in the inside of spray head joint and spray head shell, guarantees the sealing performance under the daily pressure, when the heat sensitive element is activated, the plugging is released, and the fire extinguishing agent can spray from spray head joint and spray head shell, and the whole automatic fire extinguishing device is automatically triggered by pure mechanical mode, and the use process is safe and reliable.

Description

Technical Field

[0001] This utility model belongs to the field of fire extinguisher technology, and specifically relates to an automatic fire extinguishing device. Background Technology

[0002] With the development of modern industry, transportation, and communications, the risk of fire is increasing, especially in specific scenarios such as data centers, communication base stations, locomotive carriages, and industrial control cabinets. Fires can not only cause huge economic losses but also threaten personnel safety. Traditional firefighting methods often rely on manual operation, resulting in long response times, low efficiency, and safety hazards. Therefore, automatic fire extinguishing devices have emerged, capable of automatically detecting and quickly extinguishing fires, minimizing the damage caused by fires.

[0003] Currently, the most common automatic fire extinguishing devices on the market mainly include the following categories:

[0004] The first type is the prefabricated perfluorohexanone fire extinguishing device. It has no internal pressure and operates by using a gas-generating agent that can be activated by an electrical signal. When a fire occurs in the electrical cabinet, the electrical signal activates the gas-generating agent, triggering a chemical reaction that produces a large amount of gas. The resulting pressure then propels the perfluorohexanone out to extinguish the fire. However, this type of device has significant drawbacks: first, it relies on electrical activation and requires power to operate; if a fire causes a power outage or interruption of the electrical signal transmission, it cannot be activated normally; second, the gas-generating agent involves a violent combustion or redox reaction, generating high heat and high pressure, which inherently poses a safety hazard and may cause secondary accidents.

[0005] The second type is the fire detection tube type fire extinguishing device. This device has internal pressurization and extinguishes fires by extending a fire detection tube into an electrical cabinet or protected space. When flames or heat rupture the fire detection tube, the extinguishing agent leaks from the damaged area, achieving the purpose of extinguishing the fire. However, it has also revealed many shortcomings in practical applications: First, it requires coiling and piping in the electrical cabinet, which increases the complexity and workload of installation; second, the fire detection tube has a certain probability of breakage, which may lead to false triggering and unnecessary losses; third, the fire extinguishing tank is relatively large, which makes installation inconvenient, especially in places with limited space.

[0006] The third type is aerosol fire extinguishing devices. When a flame or heat reaches a certain temperature, the aerosol is activated and releases an aerosol extinguishing agent. However, this type of device also has significant problems: First, the aerosol continuously releases heat during operation, and some products release hot gases, which may cause secondary damage to equipment or the on-site environment; second, the particles released by the aerosol are at the nanoscale, which can easily cause suffocation if inhaled, and long-term inhalation may even lead to serious health problems such as cancer and pulmonary fibrosis, posing a threat to human safety.

[0007] Therefore, developing a safe, reliable, and purely mechanically triggered automatic fire extinguishing device is currently a key research focus in this field. Utility Model Content

[0008] The purpose of this invention is to provide an automatic fire extinguishing device that relies on purely mechanical triggering and is safe and reliable.

[0009] To solve the above-mentioned technical problems, this utility model provides an automatic fire extinguishing device, including: a shell with a hollow cavity and a nozzle assembly;

[0010] The hollow cavity of the shell is used to hold pressurized gas and extinguishing agent, and the shell is provided with an extinguishing agent outlet;

[0011] The nozzle assembly includes a nozzle connector, a nozzle housing, a rupture disc, and a heat-sensitive element. A first end of the nozzle connector is connected to the extinguishing agent outlet, and a second end of the nozzle connector is connected to a first end of the nozzle housing. The nozzle connector has interconnected channels, including a first channel and a second channel. The diameter of the second channel is larger than the diameter of the first channel. The rupture disc is disposed on the end face of the second channel communicating with the first channel, and is used to block the first channel. The nozzle housing has an installation cavity, and the second channel and the installation cavity constitute a mounting position for installing the heat-sensitive element. The nozzle housing also has a spray nozzle.

[0012] When the ambient temperature does not reach the set value, the thermal element provides support for the rupture disc. When the ambient temperature reaches the set value, the thermal element deforms, and the rupture disc, after losing the support of the thermal element, is ruptured by the internal pressure of the housing, causing the extinguishing agent to be ejected from the nozzle through the channel of the nozzle connector and the mounting cavity of the nozzle housing.

[0013] Optionally, in the above-mentioned automatic fire extinguishing device, the first end of the nozzle housing is provided with a countersunk hole or an internal threaded hole, and the second end of the nozzle connector is engaged with the countersunk hole or internal threaded hole of the nozzle housing.

[0014] Optionally, the above-mentioned automatic fire extinguishing device also includes a clamping member, wherein the diameter of the mounting cavity is smaller than the diameter of the second channel, and both ends of the clamping member are used to abut against the bottom end face of the countersunk hole or internal threaded hole of the rupture disc and the nozzle housing.

[0015] Optionally, the above-mentioned automatic fire extinguishing device also includes a pressure gauge for detecting the pressure inside the hollow cavity.

[0016] Optionally, in the above-mentioned automatic fire extinguishing device, the housing is provided with a fire extinguishing agent inlet, and the pressure gauge is connected to the fire extinguishing agent inlet through a pressure gauge connector.

[0017] Optionally, the above-mentioned automatic fire extinguishing device also includes a sensor for detecting whether the thermal element is deformed and a signal receiving end, wherein the signal receiving end is used to receive the signal sent by the sensor.

[0018] Optionally, in the above-mentioned automatic fire extinguishing device, the detection end of the heat-sensitive element penetrates through the nozzle housing and extends into the mounting cavity. The mounting cavity has a recessed groove on the inner wall where the heat-sensitive element is installed, and the spray nozzle communicates with the groove.

[0019] Optionally, in the above-mentioned automatic fire extinguishing device, the heat-sensitive element is a heat-sensitive element made of heat-sensitive metal;

[0020] Alternatively, the thermistor may include a glass bulb with a built-in thermistor solution, which causes the glass bulb to break when the ambient temperature reaches a set value due to the expansion of the thermistor solution.

[0021] Optionally, in the above-mentioned automatic fire extinguishing device, the second end of the nozzle housing is provided with multiple spray ports.

[0022] Optionally, in the above-mentioned automatic fire extinguishing device, the gas is an inert gas;

[0023] The extinguishing agent is perfluorohexanone, a water-based extinguishing agent, or a dry powder extinguishing agent.

[0024] This utility model provides an automatic fire extinguishing device, the advantages of which are:

[0025] In use, the automatic fire extinguishing device is suspended above the protected space. When a fire occurs in the protected space and the temperature reaches the set value, the heat-sensitive element deforms, and the rupture disc loses the support of the heat-sensitive element. The pressure sealed above the rupture disc is released, and it ruptures under the internal pressure of the casing, pushing the heat-sensitive element downwards. This opens the channel between the nozzle connector and the nozzle housing, allowing the extinguishing agent to be sprayed out from the nozzle through the nozzle connector and the nozzle housing, thus extinguishing the fire. This solution uses a heat-sensitive element inside the nozzle connector and nozzle housing to support the rupture disc, ensuring sealing performance under normal pressure. When the heat-sensitive element is activated, the seal is released, and the extinguishing agent can be sprayed out from the nozzle connector and nozzle housing. The entire fire extinguishing device is automatically triggered by a purely mechanical means, making it safe and reliable to use. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0027] Figure 1 A schematic diagram of the structure of an automatic fire extinguishing device provided in an embodiment of this utility model;

[0028] Figure 2 A front view of an automatic fire extinguishing device provided in an embodiment of this utility model;

[0029] Figure 3 for Figure 2 Cross-sectional view along direction AA;

[0030] Figure 4 A partially enlarged view of the nozzle assembly provided in an embodiment of this utility model;

[0031] Figure 5 A cross-sectional view of the nozzle connector provided in an embodiment of this utility model;

[0032] Figure 6 A cross-sectional view of the nozzle housing provided in an embodiment of this utility model;

[0033] Figure 7 A partially enlarged view of the pressure gauge provided in an embodiment of this utility model.

[0034] In the image above:

[0035] 100 - Housing;

[0036] 200- Nozzle assembly; 210- Nozzle connector; 211- First channel; 212- Second channel; 220- Nozzle housing; 221- Mounting cavity; 222- Spray nozzle; 223- Discharge port; 230- Rupture disc; 240- Thermosensitive element; 250- Clamping component;

[0037] 300 - Pressure gauge; 310 - Pressure gauge connector; 311 - Sealing ring; 320 - Pressure gauge channel;

[0038] 400-Sensor;

[0039] A - Gas; B - Extinguishing agent. Detailed Implementation

[0040] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0041] The core of this utility model is to provide an automatic fire extinguishing device that relies on purely mechanical triggering and has the characteristics of safety and reliability.

[0042] To enable those skilled in the art to better understand the technical solutions provided by this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0043] For details, please refer to Figures 1-7 The present invention provides an automatic fire extinguishing device, comprising: a housing 100 and a nozzle assembly 200.

[0044] The housing 100 has a hollow cavity for holding extinguishing agent B and pressurized gas A. Normally, under gravity, extinguishing agent B and pressurized gas A are separated into two parts within the hollow cavity: extinguishing agent B in the lower half and pressurized gas A in the upper half. Preferably, the nozzle assembly 200 is positioned directly below the housing 100 and is vertically oriented. The housing 100 has an extinguishing agent outlet.

[0045] The nozzle assembly 200 includes a nozzle connector 210, a nozzle housing 220, a rupture disc 230, and a heat-sensitive element 240. The first end of the nozzle connector 210 is connected to the extinguishing agent outlet, and the second end of the nozzle connector 210 is connected to the first end of the nozzle housing 220. That is, the nozzle housing 220 is mounted on the housing 100 via the nozzle connector 210, achieving the purpose of spraying the extinguishing agent. The nozzle connector 210 has interconnected channels, including a first channel 211 and a second channel 212. The first channel 211 is connected to the extinguishing agent outlet, and the second channel 212 is connected to the mounting cavity 221 of the nozzle housing 220. The diameter of the second channel 212 is larger than the diameter of the first channel 211, thus forming a stepped surface between the second channel 212 and the first channel 211. The rupture disc 230 is disposed on the end face of the second channel 212 that communicates with the first channel 211, that is, the rupture disc 230 is fitted against the stepped surface to seal the first channel 211. The nozzle housing 220 has a mounting cavity 221. The second channel 212 and the mounting cavity 221 form a mounting position for mounting the rupture disc 230 and the heat-sensitive element 240. Specifically, the assembled rupture disc 230 and the heat-sensitive element 240 can remain stable in the axial direction, and the heat-sensitive element 240 provides good support for the rupture disc 230. The nozzle housing 220 has a spray nozzle 222. The first channel 211, the second channel 212, the mounting cavity 221, and the spray nozzle 222 form a channel through which the extinguishing agent B can flow out.

[0046] When the ambient temperature does not reach the set value, the thermal element 240 provides support for the rupture disc 230; when the ambient temperature reaches the set value, the thermal element 240 deforms, and the rupture disc 230, after losing the support of the thermal element 240, is ruptured by the internal pressure of the housing 100, causing the extinguishing agent B to be ejected from the nozzle 222 through the channel of the nozzle connector 210 and the mounting cavity 221 of the nozzle housing 220.

[0047] It should be noted that the thermistor 240 is made of a sensitive material whose physical properties change with temperature, such as fusible alloys, shape memory alloys, thermoplastic resins, or thermoplastic glass. The deformation of the thermistor 240 includes at least one of melting, softening, or embrittlement. The rupture disc 230 is generally made of rubber or plastic and, supported by the thermistor 240, can withstand a certain pressure without leakage. When the thermistor 240 is removed, it will rupture due to internal pressure, allowing the extinguishing agent to leak out.

[0048] This utility model provides an automatic fire extinguishing device. In use, the device is suspended above a protected space. When a fire occurs in the protected space and the temperature reaches a set value, the thermal element 240 deforms, and the rupture disc 230 loses the support of the thermal element 240. The pressure sealed above the rupture disc 230 is released, causing it to rupture under the internal pressure of the housing 100. This pushes the thermal element 240 downwards, opening the channel between the nozzle connector 210 and the nozzle housing 220, allowing the extinguishing agent B to be sprayed out from the nozzle 222 through the nozzle connector 210 and the nozzle housing 220, thus extinguishing the fire. This solution utilizes the thermal element 240 to support the rupture disc 230 inside the nozzle connector 210 and the nozzle housing 220, ensuring sealing performance under normal pressure. When the thermal element 240 is activated, the seal is released, allowing the extinguishing agent to be sprayed out from the nozzle connector 210 and the nozzle housing 220. The entire fire extinguishing device is automatically triggered by a purely mechanical means, making its use safe and reliable.

[0049] The automatic fire extinguishing device of this utility model has a simple structure and can be designed as a large fire extinguishing device with multiple nozzles. For example, multiple nozzles 222 can be opened on the side of the nozzle housing 220, or multiple nozzles can be connected in parallel to the nozzles 222 of the nozzle housing 220, with multiple nozzles distributed above different areas of the protected space.

[0050] With the widespread use of electrical equipment, the fire protection of small spaces such as electrical cabinets has become increasingly prominent. In particular, this solution can also be suspended above the interior of electrical cabinets and other protected spaces using pipe clamps or other means. It is simple and convenient to install, easy to carry, and can store a certain amount of pressure, serving as a fire extinguishing device for protecting electrical cabinets or similar (within 1 cubic meter) small spaces, meeting the market demand for efficient fire extinguishing and protection.

[0051] In a specific embodiment, the first end of the nozzle connector 210 is connected to the extinguishing agent outlet by thread or welding. The first end of the nozzle housing 220 has a countersunk hole or an internally threaded hole, and the second end of the nozzle connector 210 mates with the countersunk hole or internally threaded hole of the nozzle housing 220. Specifically, the rupture disc 230 can be installed in the second channel 212 of the nozzle connector 210, and the heat-sensitive element 240 can be installed in the mounting cavity 221 of the nozzle housing 220, and then the nozzle connector 210 and the nozzle housing 220 can be assembled together to achieve a tight and sealed connection.

[0052] Furthermore, the nozzle assembly 200 also includes a clamping member 250, the diameter of the mounting cavity 221 being smaller than the diameter of the second channel 212, and the two ends of the clamping member 250 being used to abut against the bottom end face of the countersunk hole or internal threaded hole of the rupture disc 230 and the nozzle housing 220.

[0053] Specifically, the clamping member 250 is positioned near the edge of the rupture disc 230, providing support for the edge of the rupture disc 230 and pressing it firmly within the nozzle connector 210. The thermal element 240 supports the center of the rupture disc 230, and after the thermal element 240 deforms and loses support, its center is more prone to rupture under the pressure inside the housing 100. Therefore, the thermal element 240 can be designed as a cylindrical structure, and the clamping member 250 can be designed as an arc-shaped plate structure or a sleeve structure.

[0054] This solution also includes a pressure gauge 300 for detecting the pressure inside the hollow cavity of the housing 100, used to display the pressure inside the hollow cavity. Specifically, it can be connected to the inside of the housing 100 through the pressure gauge channel 320.

[0055] Furthermore, for optimal structural arrangement, a fire extinguishing agent inlet is provided on the housing 100. Before installing the pressure gauge 300, pressurized gas A and fire extinguishing agent B can be injected into the hollow cavity through the fire extinguishing agent inlet. After injection, the pressure gauge 300 can be installed on the housing 100 via the pressure gauge connector 310. The pressure gauge 300 is connected to the fire extinguishing agent inlet via the pressure gauge connector 310. Specifically, the pressure gauge connector 310 can be welded to the housing 100, and a sealing ring 311 is provided between the pressure gauge 300 and the pressure gauge connector 310 to achieve a seal between them.

[0056] This solution also includes a sensor 400 for detecting whether the thermistor 240 is deformed and a signal receiver. The signal receiver receives the signal sent by the sensor 400. When the thermistor 240 is deformed and moves due to temperature-induced melting or cracking, the sensor 400 can transmit an electrical signal to the signal receiver. The customer can then be notified of a fire through the signal receiver and take timely action.

[0057] In a specific embodiment, the detection end of the thermal element 240 penetrates the nozzle housing 220 and extends into the mounting cavity 221. The mounting cavity 221 has a recessed groove on its inner wall where the thermal element 240 is mounted. The groove allows a certain space to be formed between the thermal element 240 and the wall of the mounting cavity 221, enabling the detection end of the thermal element 240 to extend into the groove, thus improving detection sensitivity. Furthermore, the spray nozzle 222 communicates with the groove, specifically as follows... Figure 4 and Figure 6 As shown, the nozzle 222 is inclined downwards, and the extinguishing agent B flowing into the groove can be sprayed out through the nozzle 222. An outlet 223 can also be opened at the second end of the nozzle housing 220, which can allow the melted heat-sensitive element 240 to flow out, and can also release the pressure inside the housing 100.

[0058] In the above embodiments, by integrating detection devices such as pressure gauges 300 and sensors 400 on the nozzle assembly 200, it is possible to detect whether there is a gas leak in the fire extinguisher in a timely manner, ensuring that the fire extinguisher can be used normally when needed, and that personnel can be notified in a timely manner in the event of a fire, which can effectively improve safety performance.

[0059] In one embodiment, the thermistor 240 is a thermistor made of a thermistor metal. When the ambient temperature reaches a set value, the thermistor metal melts. In another embodiment, the thermistor 240 includes a glass bulb containing a thermosensitive solution. When the ambient temperature reaches a set value, the volume expansion of the thermosensitive solution causes the glass bulb to rupture, thereby causing the rupture disc 230 to lose its supporting strength, thus allowing the extinguishing agent to be ejected.

[0060] In a specific embodiment, gas A is an inert gas that provides the power for the discharge of the extinguishing agent. Gas A can be argon or nitrogen, and its pressure is typically designed to be between 10 bar and 40 bar. Extinguishing agent B can be perfluorohexanone, a water-based extinguishing agent, or a dry powder extinguishing agent, etc., and the specific choice can be made according to the application scenario.

[0061] The beneficial effects of the technical solution provided by this utility model include:

[0062] 1. The automatic fire extinguishing device provided in this solution is small in size, easy to carry, and simple to install, and can flexibly protect small spaces.

[0063] 2. The automatic fire extinguishing device provided in this solution does not require external power such as electrical signals. It is purely mechanically triggered and can still guarantee the protective function in the worst circumstances such as water and power outages.

[0064] 3. The automatic fire extinguishing device provided in this solution is applicable to water-based fire extinguishing agents, dry powder fire extinguishing agents, and gaseous fire extinguishing agents. It can be selected according to the needs of customers and scenarios. The fire extinguishing agents used are non-toxic, harmless, and friendly to humans and the environment.

[0065] In the description of this application, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0066] In the description of this application, "multiple" means two or more. If "first" or "second" is mentioned, it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated or the order of the technical features indicated.

[0067] As indicated in this application and claims, unless the context clearly indicates otherwise, the words "a," "an," "a," and / or "the" are not specifically singular and may include the plural. Generally, the terms "comprising" and "including" only indicate the inclusion of expressly identified steps and elements, which do not constitute an exclusive list, and the method or apparatus may also include other steps or elements. An element defined by the phrase "comprising an..." does not exclude the presence of other identical elements in the process, method, product, or apparatus that includes the element.

[0068] In the description of the embodiments of this application, unless otherwise stated, " / " means "or", for example, A / B can mean A or B; "and / or" in this document is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Furthermore, in the description of the embodiments of this application, "multiple" refers to two or more.

[0069] In the description of this application, unless otherwise expressly defined, terms such as "setup," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this application in conjunction with the specific content of the technical solution.

[0070] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0071] This article uses specific examples to illustrate the principles and implementation methods of this utility model. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made to this utility model without departing from the principles of this utility model, and these improvements and modifications also fall within the protection scope of the claims of this utility model.

Claims

1. An automatic fire extinguishing device, characterized in that, include: A housing (100) with a hollow cavity and a nozzle assembly (200); The hollow cavity of the housing (100) is used to hold pressurized gas (A) and extinguishing agent (B), and the housing (100) has an extinguishing agent outlet; The nozzle assembly (200) includes a nozzle connector (210), a nozzle housing (220), a rupture disc (230), and a heat-sensitive element (240). The first end of the nozzle connector (210) is connected to the extinguishing agent outlet, and the second end of the nozzle connector (210) is connected to the first end of the nozzle housing (220). The nozzle connector (210) has channels including a first channel (211) and a second channel (212) that are interconnected. The second channel (212) has a straight... The diameter is larger than the diameter of the first channel (211). The rupture disc (230) is disposed on the end face of the second channel (212) that communicates with the first channel (211) to block the first channel (211). The nozzle housing (220) has an installation cavity (221). The second channel (212) and the installation cavity (221) constitute an installation position for installing the thermal element (240). The nozzle housing (220) has a spray port (222). When the ambient temperature does not reach the set value, the thermal element (240) is used to support the rupture disc (230). When the ambient temperature reaches the set value, the thermal element (240) deforms. After losing the support of the thermal element (240), the rupture disc (230) is ruptured by the internal pressure of the housing (100), causing the extinguishing agent (B) to be ejected from the nozzle (222) through the channel of the nozzle connector (210) and the mounting cavity (221) of the nozzle housing (220).

2. The automatic fire extinguishing device according to claim 1, characterized in that, The first end of the nozzle housing (220) is provided with a countersunk hole or an internal threaded hole, and the second end of the nozzle connector (210) is engaged with the countersunk hole or the internal threaded hole of the nozzle housing (220).

3. The automatic fire extinguishing device according to claim 2, characterized in that, It also includes a clamping member (250), the diameter of the mounting cavity (221) is smaller than the diameter of the second channel (212), and the two ends of the clamping member (250) are used to abut against the bottom end face of the countersunk hole or internal thread hole of the rupture disc (230) and the nozzle housing (220).

4. The automatic fire extinguishing device according to claim 1, characterized in that, It also includes a pressure gauge (300) for detecting the pressure inside the hollow cavity.

5. The automatic fire extinguishing device according to claim 4, characterized in that, The housing (100) has an extinguishing agent inlet, and the pressure gauge (300) is connected to the extinguishing agent inlet through a pressure gauge connector (310).

6. The automatic fire extinguishing device according to claim 1, characterized in that, It also includes a sensor (400) for detecting whether the thermal element (240) is deformed and a signal receiver for receiving signals sent by the sensor (400).

7. The automatic fire extinguishing device according to claim 6, characterized in that, The detection end of the thermal element (240) penetrates the nozzle housing (220) and extends into the mounting cavity (221). The mounting cavity (221) has a recessed groove on the inner wall where the thermal element (240) is installed. The spray nozzle (222) communicates with the groove.

8. The automatic fire extinguishing device according to claim 1, characterized in that, The thermistor (240) is a thermistor made of thermistor metal; Alternatively, the thermistor (240) may include a glass bulb with a built-in thermistor solution, which causes the glass bulb to break when the ambient temperature reaches a set value due to the volume expansion of the thermistor solution.

9. The automatic fire extinguishing device according to claim 1, characterized in that, The nozzle housing (220) has multiple spray ports (222) at its second end.

10. The automatic fire extinguishing device according to claim 1, characterized in that, The gas (A) is an inert gas; The extinguishing agent (B) is perfluorohexanone, a water-based extinguishing agent, or a dry powder extinguishing agent.

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