An automatic fire extinguishing device for power distribution cabinets

Abstract

This utility model relates to the technical field of fire-fighting equipment for power distribution cabinets, specifically to an automatic fire extinguishing device for power distribution cabinets. It includes a gas storage tank and an electromagnetic switch valve located at the opening of the gas storage tank. A connecting wire is connected to the outer side of the electromagnetic switch valve, and multiple temperature sensors are connected to the outer end of the connecting wire. A delivery hose is connected to the outer end of the electromagnetic switch valve, and the delivery hose is interconnected with the gas storage tank via the electromagnetic switch valve. This utility model, through a nested sliding design of a unit-sealed sleeve on the delivery hose, and in conjunction with an optional release plug, allows for free and precise adjustment of the position of each fire extinguishing agent discharge point according to different models and internal structures of power distribution cabinets. This solves the inherent defects of traditional fixed pipeline systems, which cannot be modified after installation and are difficult to perfectly match diverse cabinet structures, enabling customized installation and improving the versatility of the device.

Description

Technical Field

[0001] This utility model relates to the field of fire protection equipment for power distribution cabinets, and in particular to an automatic fire extinguishing device for power distribution cabinets. Background Technology

[0002] As the core equipment for power distribution and control, distribution cabinets are widely used in various industrial, commercial and civil buildings. Currently, most automatic gas fire extinguishing devices used in distribution cabinets adopt a fixed pipeline design. When the detector senses a fire signal, the control unit is activated to release the fire extinguishing agent in the storage cylinder. The fire extinguishing agent is transported to the protected area through a pre-laid pipeline and finally sprayed through a nozzle fixedly installed at the end of the pipeline to extinguish the fire.

[0003] Because different models of distribution cabinets have different internal structures, component layouts and space sizes, and even different areas within the same cabinet have different fire risk levels, the installation positions of the pipe nozzles are fixed and cannot be adjusted according to needs. This makes it difficult to achieve optimal coverage and precise delivery of extinguishing agents, which may lead to fire extinguishing dead zones or uneven concentration of extinguishing agents, thereby affecting fire extinguishing efficiency and even causing unnecessary waste of extinguishing agents. Utility Model Content

[0004] In view of this, the purpose of this utility model is to propose an automatic fire extinguishing device for power distribution cabinets, so as to solve the problems of current fixed pipeline automatic gas fire extinguishing devices, where the installation position of the pipeline nozzles is fixed, cannot be adjusted according to needs, makes it difficult to achieve optimal coverage and accurate delivery of extinguishing agents, and has poor flexibility of use.

[0005] To achieve the above objectives, this utility model provides an automatic fire extinguishing device for a power distribution cabinet, including a gas storage tank, and further comprising: An electromagnetic switch valve is installed at the opening of the gas storage tank. A connecting wire is connected to the outside of the electromagnetic switch valve, and multiple temperature sensors are connected to the outer end of the connecting wire. A delivery hose is connected to the outer end of the electromagnetic switch valve, and the delivery hose is connected to the gas storage tank through the electromagnetic switch valve. Multiple unit-sealed sleeves are evenly arranged along the extension direction of the conveying hose. The unit-sealed sleeves are nested and slidably arranged on the outside of the conveying hose. Elastic sealing rings are provided at both the left and right ends of the inner side of the unit-sealed sleeves. An installation socket is provided at the center of the side wall of the unit-sealed sleeves. The inner wall of the installation socket is surrounded by a fixing thread. A release plug is fitted inside the mounting socket. The outer wall of the release plug is surrounded by mounting threads. The release plug is detachably and closedly connected to the mounting socket through the mounting threads and fixing threads. The bottom of the release plug is provided with a insertion tip. A central delivery tube is disposed inside the release plug. The outer end of the release plug is provided with a release opening. The bottom end of the side wall of the release plug is provided with a connecting hole. The connecting hole is connected to the release opening through the central delivery tube.

[0006] Furthermore, a closed piston is nested and slidably arranged inside the central delivery pipe, and an expansion release pipe is provided at the outer end of the central delivery pipe. The release opening is located at the outer end of the expansion release pipe, and the central delivery pipe is interconnected with the release opening through the expansion release pipe.

[0007] Furthermore, a traction connecting rod is connected to the outer end of the closed piston, and a diffusion baffle is connected to the outer end of the traction connecting rod. The diffusion baffle is located outside the release opening and its size is matched. Multiple diffusion openings are evenly arranged in the middle of the diffusion baffle. A limit block is provided at the edge of the release opening, and the limit block is matched with the closed piston.

[0008] Furthermore, an annular locking groove is provided in the middle of the side wall of the central delivery pipe, a horizontal guide sleeve is provided in the middle of the interior of the closed piston, a connecting opening is provided at the outer end of the horizontal guide sleeve, a locking pin is nested and slidably provided on the inner side of the horizontal guide sleeve, the locking pin and the annular locking groove are mutually cooperated, and a locking spring is provided on the rear side of the locking pin.

[0009] Furthermore, the interior of the annular locking groove is connected to the bottom end of the central delivery pipe.

[0010] Furthermore, a thermally conductive detection tube is connected to the outer side of the release plug, a detection balloon is provided at the outer end of the thermally conductive detection tube, a detection delivery tube is connected to the inner end of the thermally conductive detection tube, and the thermally conductive detection tube is interconnected with the annular locking groove through the detection delivery tube.

[0011] The beneficial effects of this utility model are as follows: As can be seen from the above description, the automatic fire extinguishing device for distribution cabinets provided by this utility model, through the nested sliding design of the unit closed sleeve on the delivery hose, and in conjunction with the optional installation of the release plug, can freely and precisely adjust the position of each fire extinguishing agent spray point according to different models and internal structures of distribution cabinets. This solves the inherent defects of traditional fixed pipeline systems that cannot be changed after installation and are difficult to perfectly match diverse cabinet structures, realizes customized installation, and improves the versatility of the device. Attached Figure Description

[0012] To more clearly illustrate the technical solutions in 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 for this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0013] Figure 1 This is a schematic diagram of the structure of an embodiment of the present utility model; Figure 2 This is a schematic diagram of the structure of the unit closed sleeve according to an embodiment of the present utility model; Figure 3 This is a schematic diagram of the internal structure of the unit enclosed sleeve according to an embodiment of the present utility model; Figure 4 This is a schematic diagram of the release plug according to an embodiment of the present invention; Figure 5 This is a schematic diagram of the release plug in the open state according to an embodiment of the present invention; Figure 6 This is a schematic diagram of the structure of the closed piston in an embodiment of the present invention.

[0014] The diagram is marked as follows: 1. Gas storage tank; 101. Electromagnetic switch valve; 102. Delivery hose; 103. Temperature sensor; 104. Connecting wire; 2. Unit sealing sleeve; 201. Elastic sealing ring; 202. Mounting socket; 203. Fixing thread; 3. Release plug; 301. Mounting thread; 302. Insertion tip; 303. Connecting opening; 304. Release opening; 305. Limiting block; 4. Central delivery pipe; 401. Expansion release pipe; 402. Annular locking groove; 5. Sealing piston; 501. Horizontal guide sleeve; 502. Locking pin; 503. Locking spring; 504. Connecting opening; 6. Diffusion baffle; 601. Diffusion opening; 602. Traction connecting rod; 7. Thermal detection pipe; 701. Detection balloon; 702. Detection delivery pipe. Detailed Implementation

[0015] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to specific embodiments.

[0016] It should be noted that, unless otherwise defined, the technical or scientific terms used in this utility model should have the ordinary meaning understood by one of ordinary skill in the art to which this utility model pertains. The terms "first," "second," and similar terms used in this utility model do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0017] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 As shown, an automatic fire extinguishing device for a power distribution cabinet includes a gas storage tank 1, and further includes: An electromagnetic switch valve 101 is installed at the opening of the gas storage tank 1. A connecting wire 104 is connected to the outside of the electromagnetic switch valve 101, and multiple temperature sensors 103 are connected to the outer end of the connecting wire 104. A delivery hose 102 is connected to the outer end of the electromagnetic switch valve 101, and the delivery hose 102 is connected to the gas storage tank 1 through the electromagnetic switch valve 101. Multiple unit-enclosed sleeves 2 are evenly arranged along the extension direction of the conveying hose 102. The unit-enclosed sleeves 2 are nested and slidably arranged on the outside of the conveying hose 102. Elastic sealing rings 201 are provided at both the left and right ends of the inner side of the unit-enclosed sleeves 2. An installation socket 202 is provided at the center of the side wall of the unit-enclosed sleeve 2. A fixing thread 203 is provided around the inner wall of the installation socket 202. Release plug 3 is fitted inside the mounting socket 202. The outer wall of release plug 3 is surrounded by mounting threads 301. Release plug 3 is detachably and closedly connected to mounting socket 202 through mounting threads 301 and fixing threads 203. The bottom of release plug 3 is provided with a insertion tip 302. The central delivery pipe 4 is located inside the release plug 3. The outer end of the release plug 3 is provided with a release opening 304. The bottom side wall of the release plug 3 is provided with a connecting opening 303. The connecting opening 303 is connected to the release opening 304 through the central delivery pipe 4.

[0018] In this embodiment, the device can plan the fire extinguishing points according to the actual internal structure, size, and distribution of key electrical components of the distribution cabinet to be protected. The required number of unit-enclosed sleeves 2 can be nested and slid along the length of the delivery hose 102, adjusting and positioning each unit-enclosed sleeve 2 to the preset fire extinguishing point position. Because an elastic sealing ring 201 is provided between the sleeve and the hose, the resistance during sliding adjustment is moderate, and after adjustment, it can remain stable on the hose due to the friction of the sealing ring, preventing it from shifting on its own. This achieves stepless and flexible adjustment of the discharge position. After the position is adjusted, the release plug 3 is installed, connecting the installation thread 301 of the release plug 3 to the unit-enclosed sleeve 2. Align the fixing thread 203 of the mounting socket 202, and then screw the release plug 3 into the delivery hose 102. During the screwing process, the insertion tip 302 at the bottom of the release plug 3 will gradually pierce the outer wall of the delivery hose 102 and eventually penetrate into its internal cavity. At this point, the communication and delivery structure between the unit sealing sleeve 2 and the delivery hose 102 is completed. Repeat this operation to install the release plug 3 on all unit sealing sleeves 2 at the planned positions. For the mounting socket 202 without the release plug 3 installed, it is in a closed state and no gas leakage will occur. Multiple temperature sensors 103 are connected to the solenoid switch valve 101 through the connecting wire 104 and are distributed... The temperature sensors 103 are deployed in a distributed manner in the most heat-prone or fire-prone areas within the distribution cabinet for real-time temperature monitoring. When a fire suddenly breaks out in the distribution cabinet due to an electrical fault or other cause, the temperature sensor 103 near the fire source quickly detects the abnormal high temperature and generates a signal. This signal is transmitted to the solenoid valve 101 via the connecting wire 104. Upon receiving the trigger signal, the solenoid valve 101 immediately activates and opens. After the valve opens, the pressurized extinguishing gas stored in the gas storage tank 1, such as perfluorohexanone, heptafluoropropane, or inert gas, is released. The extinguishing gas first passes through the solenoid valve 101 and then enters the delivery hose 102. The high-pressure gas flows rapidly within the hose and passes through all installed release mechanisms. The gas flows into the central delivery pipe 4 inside the plug 3 through the insertion tip 302. Then, the gas enters the cavity of the release plug 3 through the connecting opening 303 and is finally ejected at high speed from the release opening 304, directly and accurately acting on the fire source area or the entire cabinet space to achieve rapid fire extinguishing. Thus, the device, through the nested sliding design of the unit closed sleeve 2 on the delivery hose 102, and with the optional installation of the release plug 3, can freely and accurately adjust the position of each fire extinguishing agent discharge point according to different models and internal structures of distribution cabinets. This solves the inherent defects of traditional fixed pipeline systems that cannot be changed after installation and are difficult to perfectly match various cabinet structures, realizes customized installation, and improves the versatility of the device.

[0019] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 As shown, preferably, a closed piston 5 is nested and slidably arranged inside the central delivery pipe 4 of the device, and an expansion release pipe 401 is provided at the outer end of the central delivery pipe 4. The release opening 304 is located at the outer end of the expansion release pipe 401. The central delivery pipe 4 is interconnected with the release opening 304 through the expansion release pipe 401. When the device is not triggered, the closed piston 5 is tightly pressed against the inner side of the central delivery pipe 4 under the action of pre-tightening force, such as friction, forming a reliable mechanical seal. This effectively isolates the external environment and prevents dust, oil, insects, and other impurities inside the distribution cabinet from entering the central delivery pipe 4 and even the entire delivery hose 102 system through the release opening 304, thereby completely avoiding potential hazards caused by the accumulation of foreign objects. To mitigate the risk of blockage and ensure the long-term reliability of the system, when a fire occurs, the electromagnetic switch valve 101 opens, and high-pressure extinguishing gas rapidly flows into the delivery hose 102 and enters the release plug 3 through the opening of the insertion tip 302. The high-pressure gas reaches the rear end of the sealing piston 5, generating a strong forward thrust. When this thrust overcomes the preload, the sealing piston 5 is immediately pushed forward and slides forward in the central delivery pipe 4, thereby opening the closed channel. Subsequently, the high-pressure extinguishing gas passes through the opened central delivery pipe 4 and the expansion release pipe 401 in sequence, and finally sprays out at high speed from the release opening 304 to extinguish the fire. The entire opening process is driven entirely by gas pressure, without any electronic control components, and the response is extremely rapid and reliable.

[0020] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6As shown, preferably, the outer end of the closed piston 5 of the device is connected to a traction connecting rod 602, and the outer end of the traction connecting rod 602 is connected to a diffusion baffle 6. The diffusion baffle 6 is located outside the release opening 304 and its size is matched. A plurality of diffusion openings 601 are evenly arranged in the middle of the diffusion baffle 6. A limit block 305 is provided at the edge of the release opening 304. The limit block 305 is matched with the closed piston 5. The limit block 305 protrudes inward and its function is to contact the outer end face of the closed piston 5 that has moved to this position and form mechanical interference, thereby preventing the piston from further disengaging. When not triggered, the closed piston 5 is in the initial position under the action of pre-tightening force, closing the outlet of the central delivery pipe 4. At this time, the diffusion baffle 6 connected to it by the traction connecting rod 602 hangs down naturally or is close to the outside of the release opening 304, without affecting the overall structure of the device. When high-pressure extinguishing gas rushes in, it pushes the closed piston 5 to overcome the pre-tightening force and slide outward along the central delivery pipe 4. The piston drives the traction connecting rod 602. The pistons move forward together, thus pulling the diffuser baffle 6 away from the release opening 304 by a certain distance. When the closed piston 5 slides to the end of the expansion release tube 401, its outer end face is firmly blocked by the limiting block 305 at the edge of the release opening 304, so that the entire piston, connecting rod and baffle system stops in a precise and fixed working position. At this time, the high-pressure gas first enters the smaller diameter central delivery tube 4, and then enters the significantly larger diameter expansion release tube 401. The gas expands rapidly in the space inside the expansion release tube 401, reducing the flow rate and pressure, and then is ejected through the release opening 304. The ejected gas jet directly impacts the diffuser baffle 6 in front, and its kinetic energy is effectively consumed and dispersed, avoiding the physical impact damage that the direct injection of high-pressure gas may cause to the precision electrical components inside the cabinet. At the same time, after the airflow hits the baffle, it is forced to change direction, and through the multiple diffuser openings 601 evenly distributed on the baffle and flowing around the edge of the baffle, a diffuse mist with a wider coverage, more uniform flow rate and more diverse directions is formed. This greatly improves the uniformity of fire extinguishing agent distribution within the limited space of the distribution cabinet, enabling the fire extinguishing concentration to fill the entire space more evenly and extinguish the flames without any blind spots.

[0021] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6As shown, preferably, an annular locking groove 402 is provided in the middle of the side wall of the central delivery pipe 4 of the device, and a horizontal guide sleeve 501 is provided in the middle of the interior of the closed piston 5. The outer end of the horizontal guide sleeve 501 is provided with a connecting opening 504, and a locking pin 502 is nested and slidably disposed inside the horizontal guide sleeve 501. The shape of the inner end of the locking pin 502 matches the shape of the annular locking groove 402. A locking spring 503 is installed on the rear side of the locking pin 502, providing it with a continuous outward thrust, so that under normal conditions, the end of the locking pin 502 can extend under the action of the spring force and fit precisely into the annular locking groove 402, effectively locking the closed piston 5 firmly in the initial sealed position in the central delivery pipe 4, preventing the piston from being accidentally opened due to vibration, accidental contact, or slight pressure fluctuations. The interior of the annular locking groove 402 is not a closed structure, and its bottom is connected to the center through a machining channel. The bottom end of the delivery pipe 4, i.e. the air inlet end, is connected to each other. When no fire occurs, the closed piston 5 is fixed by the locking pin 502, sealing the channel. The elastic force of the locking spring 503 is much greater than the interference force that may be encountered in daily life, ensuring the absolute reliability of the locking. When a fire occurs, after the electromagnetic switch valve 101 is opened, the high-pressure fire extinguishing gas rushes into the delivery hose 102 and enters the bottom end of the central delivery pipe 4. Most of the gas directly acts on the rear end face of the closed piston 5, providing it with the opening thrust. At the same time, the high-pressure gas enters the internal cavity of the annular locking groove 402 through the connecting hole at the bottom of the annular locking groove 402. The gas pressure acts directly on the end section of the locking pin 502 that extends into the groove. The force generated on the locking pin 502 will overcome the preload of the locking spring 503 and push the locking pin 502 backward, so that its end completely exits from the annular locking groove 402, thereby achieving mechanical unlocking. Once the lock is released, the high-pressure gas acting on the rear end face of the closed piston 5 can push the entire piston forward without hindrance, opening the release channel and executing the subsequent fire extinguishing agent release process, effectively improving the safety and daily stability of the system.

[0022] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6As shown, preferably, to achieve an earlier, more direct, and independent response to fires, the device incorporates a purely mechanical thermal trigger unlocking mechanism. This mechanism includes a thermally conductive detection tube 7 located outside the release plug 3. The tube is made of a metal material with good thermal conductivity. One end extends to the outside of the release plug 3, and a detection balloon 701 is sealed to its outermost end. The detection balloon 701 is also made of a flexible metal film or a high-temperature resistant polymer to increase the heat-sensing area. The other end of the detection tube 7 is connected to a detection delivery tube 702. This delivery tube 702 ultimately communicates with the internal cavity of the annular locking groove 402 on the side wall of the central delivery tube 4, forming a closed hydraulic circuit. The sealed cavity formed by the balloon 701, the thermally conductive detection tube 7, and the detection delivery tube 702 is pre-filled with a liquid with a high coefficient of thermal expansion, such as silicone oil, specific esters, or ethanol. At normal temperature, the sealed liquid is at its initial volume, and the system maintains atmospheric pressure. At the same time, in this working mode, the electromagnetic switch valve 101 of the device remains open, and the locking pin 502 is firmly embedded in the annular locking groove 402 under the action of the locking spring 503, locking the sealing piston 5 in the closed position. At this time, the detection balloon 701 and the thermally conductive detection tube 7 continuously monitor the ambient temperature of their location in the distribution cabinet in real time. When a fire or local overheating occurs in the distribution cabinet, the flame or high-temperature hot air flow first acts on the detection balloon 701 and the thermally conductive detection tube 7, causing the liquid filled inside to be rapidly heated and expand in volume. The hydraulic pressure transmitted through the delivery pipe 702 to the cavity of the annular locking groove 402 directly acts on the end face of the locking pin 502, forming a backward thrust. When this thrust increases with the temperature and eventually exceeds the preload of the locking spring 503, it will push the locking pin 502 backward, causing its end to completely exit from the annular locking groove 402, thus achieving mechanical unlocking. Once the lock is released, it can quickly spray to extinguish the fire. Each release plug 3 has its own independent temperature-sensing unlocking unit. The fire will only trigger the nozzle closest to the fire source and the one whose temperature rises first, thus achieving true "point-to-point" precise fire extinguishing, minimizing the amount of extinguishing agent used, and avoiding unnecessary spraying of unburned areas. The entire triggering process does not rely on any power, electronic signals, or control circuits, avoiding the risk of failure such as electronic sensor malfunction, false alarms, or circuit damage. Even in the extreme case where the main power supply of the distribution cabinet has been cut off, it can still work independently and reliably, providing safety redundancy.

[0023] The automatic fire extinguishing device for distribution cabinets provided by this utility model, through the nested sliding design of the unit closed sleeve 2 on the delivery hose 102, and in conjunction with the optional installation of the release plug 3, can freely and precisely adjust the position of each fire extinguishing agent spray point according to different models and internal structures of distribution cabinets. This solves the inherent defects of traditional fixed pipeline systems that cannot be changed after installation and are difficult to perfectly match diverse cabinet structures, realizes customized installation, and improves the versatility of the device.

[0024] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of this utility model is limited to these examples; within the framework of this utility model, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of the different aspects of this utility model as described above, which are not provided in the details for the sake of brevity. Any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. An automatic fire extinguishing device for an electrical distribution cabinet comprising a gas storage tank (1), characterized in that, Also includes: An electromagnetic switch valve (101) is provided at the opening of the gas storage tank (1). A connecting wire (104) is connected to the outside of the electromagnetic switch valve (101), and multiple temperature sensors (103) are connected to the outer end of the connecting wire (104). A delivery hose (102) is connected to the outer end of the electromagnetic switch valve (101), and the delivery hose (102) is connected to the gas storage tank (1) through the electromagnetic switch valve (101). A unit closed sleeve (2) is evenly arranged in multiple ways along the extension direction of the conveying hose (102). The unit closed sleeve (2) is nested and slidably arranged on the outside of the conveying hose (102). The left and right ends of the inner side of the unit closed sleeve (2) are provided with elastic sealing rings (201). The center of the side wall of the unit closed sleeve (2) is provided with an installation socket (202). The inner wall of the installation socket (202) is surrounded by a fixing thread (203). A release plug (3) is fitted inside the mounting socket (202). The outer wall of the release plug (3) is surrounded by mounting threads (301). The release plug (3) is detachably and closedly connected to the mounting socket (202) through the mounting threads (301) and the fixing threads (203). The bottom of the release plug (3) is provided with a insertion tip (302). A central delivery tube (4) is disposed inside the release plug (3). The outer end of the release plug (3) is provided with a release opening (304). The bottom end of the side wall of the release plug (3) is provided with a connecting opening (303). The connecting opening (303) is connected to the release opening (304) through the central delivery tube (4).

2. The automatic fire extinguishing device for power distribution cabinets according to claim 1, characterized in that, A closed piston (5) is nested and slidably arranged inside the central delivery pipe (4). An expansion release pipe (401) is provided at the outer end of the central delivery pipe (4). The release opening (304) is located at the outer end of the expansion release pipe (401). The central delivery pipe (4) is interconnected with the release opening (304) through the expansion release pipe (401).

3. The power distribution cabinet automatic fire extinguishing device according to claim 2, characterized in that, The outer end of the closed piston (5) is connected to a traction connecting rod (602), and the outer end of the traction connecting rod (602) is connected to a diffusion baffle (6). The diffusion baffle (6) is located outside the release opening (304) and its size is matched. A plurality of diffusion openings (601) are evenly arranged in the middle of the diffusion baffle (6). A limit block (305) is provided at the edge of the release opening (304). The limit block (305) is matched with the closed piston (5).

4. The power distribution cabinet automatic fire extinguishing device according to claim 3, characterized in that, The central delivery pipe (4) has an annular locking groove (402) in the middle of its side wall. The closed piston (5) has a horizontal guide sleeve (501) in the middle of its interior. The outer end of the horizontal guide sleeve (501) has a connecting opening (504). A locking pin (502) is nested and slidably arranged inside the horizontal guide sleeve (501). The locking pin (502) and the annular locking groove (402) are mutually engaged. A locking spring (503) is arranged on the rear side of the locking pin (502).

5. The power distribution cabinet automatic fire extinguishing device according to claim 4, characterized in that, The interior of the annular locking groove (402) is connected to the bottom end of the central delivery pipe (4).

6. The power distribution cabinet automatic fire extinguishing device according to claim 4, characterized in that, A thermally conductive detection tube (7) is connected to the outside of the release plug (3). A detection balloon (701) is provided at the outer end of the thermally conductive detection tube (7). A detection delivery tube (702) is connected to the inner end of the thermally conductive detection tube (7). The thermally conductive detection tube (7) is interconnected with the annular locking groove (402) through the detection delivery tube (702).

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