External pressure storage type perfluorohexanone fire extinguishing equipment

Abstract

The utility model belongs to the field of fire fighting equipment, and provides external pressure storage type perfluorohexanone fire extinguishing equipment which comprises a box body, a bottle body assembly, a valve body assembly, a connecting pipe fitting and a spraying assembly. Wherein the bottle body assembly comprises a fire extinguishing agent bottle and a driving gas bottle which are arranged in the box body, and further comprises a starting gas bottle arranged outside the box body; the valve body assembly comprises container valves capable of being opened and closed pneumatically and further comprises bottle head valves capable of being opened and closed manually or through electromagnetic driving, the container valves are installed on the fire extinguishing agent bottle and the driving gas bottle respectively, and the bottle head valves are installed on the starting gas bottle. The connecting pipe fitting comprises a communicating pipe which is connected between the container valves and is used for communicating the fire extinguishing agent bottle and the driving gas bottle, and further comprises a gas control pipe which is connected between the container valves and the bottle head valves; the spraying assembly comprises a spraying head and a collecting pipe connected with the spraying head and the fire extinguishing agent bottle.

Description

Technical Field

[0001] This application belongs to the field of fire protection equipment, and in particular relates to an externally pressurized perfluorohexanone fire extinguishing device. Background Technology

[0002] Perfluorohexanone (PFH) fire suppression systems are increasingly used in critical locations, but traditional systems suffer from a common design flaw: their activation gas source is typically housed within a protective enclosure, shared with the extinguishing agent storage unit. This built-in design necessitates opening the enclosure for maintenance to access the gas source and related valves, leading to cumbersome operations and the risk of accidentally triggering the system or damaging internal components during maintenance. Furthermore, the close proximity of the gas source control unit and the extinguishing agent storage unit within a confined space means that leaks or other malfunctions in the gas path directly threaten the reliability of the entire system, potentially causing false activation or failure. These issues are particularly pronounced in applications requiring high reliability. Therefore, it is essential to address these technical challenges. Summary of the Invention

[0003] The purpose of this application is to provide an externally pressurized perfluorohexanone fire extinguishing device to solve the technical problem of poor reliability of fire extinguishing devices in the prior art.

[0004] To achieve the above objectives, the technical solution adopted in this application is: to provide an externally pressurized perfluorohexanone fire extinguishing device, including a housing, a cylinder assembly, a valve assembly, connecting pipes, and a sprinkler assembly. Wherein:

[0005] The cylinder assembly includes an extinguishing agent cylinder and a propellant cylinder disposed inside the housing, and also includes an activation cylinder disposed outside the housing;

[0006] The valve body assembly includes a container valve that can be pneumatically opened and closed, and a bottle head valve that can be manually or electromagnetically opened and closed. The container valve is respectively installed on the extinguishing agent cylinder and the driving gas cylinder, and the bottle head valve is installed on the starting gas cylinder.

[0007] The connecting pipe includes a connecting pipe for connecting the extinguishing agent cylinder and the driving gas cylinder between the container valve output port on the driving gas cylinder and the extinguishing agent cylinder, and also includes a gas control pipe connecting the container valve and the cylinder head valve control end;

[0008] A sprinkler assembly includes a nozzle and a manifold connecting the nozzle and the extinguishing agent cylinder.

[0009] Optionally, the valve body assembly further includes a selection valve;

[0010] The selector valve includes a valve body, a valve core, and a limiting structure. The valve body forms a flow channel communicating with the manifold. The valve core is slidably connected to the valve body and can open or close the flow channel during sliding relative to the valve body. The valve core also forms a cross-sectional shape adapted to the flow channel in its sliding direction so as to be driven by the fire-fighting medium in the flow channel. The limiting structure includes a control air inlet and a control air outlet formed on the valve body and communicating with each other. The limiting structure is connected to the cylinder valve through the control air inlet and can be controlled by the cylinder valve to limit or release the sliding of the valve core. The cylinder valve is connected to the control end of the container valve in sequence through the control air inlet and the control air outlet.

[0011] Optionally, the selector valve further includes a valve cover connected to the valve body;

[0012] The valve core is also slidably connected to the valve cover and cooperates with the valve cover to form a sealed receiving cavity. A connecting hole is also formed on the valve core to connect the receiving cavity to the flow channel.

[0013] Optionally, the limiting structure includes a rotating shaft and a limiting shaft that are rotatably mounted on the valve cover and are arranged in parallel at intervals, and also includes a stop block connected to the rotating shaft and capable of rotating with the rotating shaft, a swing arm connected to the limiting shaft, and a cylinder body mounted on the valve body;

[0014] The stop block has a locking lug at one end near the limiting shaft, and a notch is formed on the limiting shaft that can be engaged beyond the locking lug. The valve core passes through the valve cover and abuts against the stop block. The cylinder body forms a control air channel that connects the control air inlet and the control air outlet, and a cylinder piston that is movably disposed in the control air channel. The end of the swing arm away from the limiting shaft interferes with the movement path of the cylinder piston and can be driven by the cylinder piston to swing.

[0015] Optionally, the limiting structure further includes a positioning shaft disposed between the rotating shaft and the limiting shaft, and a torsion spring connected to the positioning shaft;

[0016] The swing arm is connected to the torsion spring and generates a tendency to return to the initial position through the torsion spring.

[0017] Optionally, the limiting structure further includes a manual handle connected to the limiting shaft and capable of driving the limiting shaft to rotate.

[0018] Optionally, the limiting structure further includes screws threaded onto the valve cover;

[0019] The screw's axial direction is parallel to the valve core's direction of movement, and the stop block abuts against the valve core via the screw.

[0020] Optionally, the valve body assembly further includes low-leakage, high-sealing valves respectively disposed on the connecting pipe, the pneumatic control pipe, and the manifold.

[0021] Optionally, the valve body assembly further includes a one-way valve;

[0022] The one-way valve is installed on the pneumatic control line between the selector valve and the bottle head valve and enables one-way flow from the bottle head valve to the selector valve.

[0023] Optionally, the spray assembly further includes a signal feedback device for feeding back spray signals, the signal feedback device being disposed on the manifold between the selector valve and the nozzle.

[0024] The beneficial effects of the externally pressurized perfluorohexanone fire extinguishing device provided in this application are as follows: Compared with the prior art, because the starting gas cylinder is externally located and specifically used to start the container valves on the driving gas cylinder and the extinguishing agent cylinder, operators can now directly maintain and operate the system's starting gas source without opening the enclosure. This not only greatly simplifies the daily maintenance process, but more importantly, completely avoids the risk of misoperation that may be caused by opening the enclosure for maintenance, significantly improving the safety of system maintenance. Simultaneously, this design achieves physical isolation between the starting control circuit and the extinguishing agent storage circuit. Even if the external starting control circuit leaks or experiences other malfunctions, it will not affect the sealed storage state of the extinguishing agent and main driving gas inside the enclosure, thus ensuring that the core fire extinguishing unit always remains in a standby state. This fault isolation mechanism fundamentally improves the overall reliability of the fire extinguishing system, far superior to existing technologies. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this application, 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 some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of the overall structure of the externally pressurized perfluorohexanone fire extinguishing device in the embodiments of this application;

[0027] Figure 2 This is a cross-sectional view of the overall structure of the valve in the embodiment of this application;

[0028] Figure 3 This is a partial structural cross-sectional view of the valve in an embodiment of this application;

[0029] Figure 4 This is a top view of the overall structure of the valve in the embodiment of this application;

[0030] Figure 5 For along Figure 4 Cross-sectional view of line AA in the middle.

[0031] The reference numerals in the figures are as follows: 100, housing; 201, extinguishing agent bottle; 202, driving gas cylinder; 203, starting gas cylinder; 301, container valve; 302, cylinder head valve; 303, selector valve; 304, valve body; 305, valve core; 306, flow passage; 307, control gas inlet; 308, control gas outlet; 309, valve cover; 310, receiving cavity; 311, connecting hole; 312, rotating shaft; 313, limiting shaft; 314, stop block; 315, swing arm; 316, cylinder body; 317, snap-fit ​​ear; 318, notch; 319, control gas passage; 320, cylinder piston; 321, positioning shaft; 322, torsion spring; 323, manual handle; 324, screw; 325, low-leakage high-seal valve; 326, one-way valve; 327, signal feedback device. 401. Connecting pipe; 402. Pneumatic control pipe; 501. Nozzle; 502. Manifold. Detailed Implementation

[0032] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0033] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0034] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", 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.

[0035] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0036] Please refer to the following: Figures 1 to 5 This application now describes an externally pressurized perfluorohexanone fire extinguishing device according to an embodiment. The externally pressurized perfluorohexanone fire extinguishing device includes a housing 100, a cylinder assembly, a valve assembly, connecting pipes, and a sprinkler assembly. Wherein:

[0037] The cylinder assembly includes an extinguishing agent cylinder 201 and a driving gas cylinder 202 disposed inside the housing 100, and an ignition gas cylinder 203 disposed outside the housing 100. In this embodiment, the extinguishing agent cylinder 201 may be filled with perfluorohexanone extinguishing agent, and the driving gas cylinder 202 and the ignition gas cylinder 203 may be filled with nitrogen, which is commonly used in the art, as a gas source. The valve body assembly includes a container valve 301 that can be pneumatically opened and closed, and a cylinder head valve 302 that can be manually or electromagnetically opened and closed. The container valve 301 is installed on the extinguishing agent cylinder 201 and the driving gas cylinder 202, respectively, and the cylinder head valve 302 is installed on the starting gas cylinder 203. The connecting pipe includes a connecting pipe 401 connecting the outlet of the container valve 301 on the driving gas cylinder 202 and the extinguishing agent cylinder 201 to connect the extinguishing agent cylinder 201 and the driving gas cylinder 202, and also includes a pneumatic control pipe 402 connecting the control ends of the container valve 301 and the cylinder head valve 302. The spray assembly includes a nozzle 501 and a manifold 502 connecting the nozzle 501 and the extinguishing agent cylinder 201.

[0038] According to the structure provided in this embodiment, since the starting gas cylinder 203 is externally mounted and specifically used to start the container valves 301 on the driving gas cylinder 202 and the extinguishing agent cylinder 201, operators can now directly maintain and operate the system's starting gas source without opening the housing 100. This not only greatly simplifies the daily maintenance process, but more importantly, completely avoids the risk of misoperation that may be caused by opening the housing for maintenance, significantly improving the safety of system maintenance. At the same time, this design achieves physical isolation between the starting control circuit and the extinguishing agent storage circuit. Even if the external starting control circuit leaks or experiences other malfunctions, it will not affect the sealed storage state of the extinguishing agent and main driving gas inside the housing 100, thereby ensuring that the core fire extinguishing unit always remains in a standby state. This fault isolation mechanism fundamentally improves the overall reliability of the fire extinguishing system, far superior to existing technologies.

[0039] In another embodiment of this application, please refer to [the relevant document / reference]. Figures 1 to 5The valve body assembly also includes a selector valve 303; the selector valve 303 includes a valve body 304, a valve core 305, and a limiting structure. The valve body 304 forms a flow passage 306 that communicates with the manifold 502. The valve core 305 is slidably connected to the valve body 304 and can open or close the flow passage 306 during the sliding process relative to the valve body 304. The valve core 305 also forms a cross-sectional shape that matches the flow passage 306 in its own sliding direction so as to be driven by the fire-fighting medium in the flow passage 306. The limiting structure includes a control air inlet 307 and a control air outlet 308 formed on the valve body 304 and communicating with each other. The limiting structure is connected to the cylinder valve 302 through the control air inlet 307 and can be controlled by the cylinder valve 302 to limit or release the sliding of the valve core 305. The cylinder valve 302 is connected to the control end of the container valve 301 in sequence through the control air inlet 307 and the control air outlet 308.

[0040] According to the structure provided in this embodiment, after the cylinder valve 302 is opened, the airflow in the starting gas cylinder 203 flows from the control gas inlet 307 into the selector valve 303, which allows the limiting structure to release the limiting of the valve core 305. Subsequently, the airflow continues to flow from the control gas outlet 308 to the container valve 301 and opens the container valve 301. The extinguishing medium in the extinguishing agent cylinder 201 flows from the manifold 502 to the flow passage 306 under the pressure of the driving airflow in the driving gas cylinder 202. Since the valve core 305 can be driven by this part of the fire-fighting medium and slides relative to the valve body 304 to open the flow passage 306, the extinguishing medium can flow through the flow passage 306 and the manifold 502 in sequence to the nozzle 501 and be sprayed to the target position. In this way, the externally pressurized perfluorohexanone fire extinguishing device in this embodiment can release the extinguishing medium by opening the limiting structure and the flow passage 306 in sequence, which can further improve the reliability of the fire extinguishing system.

[0041] In another embodiment of this application, please refer to [the relevant document / reference]. Figures 1 to 5 The selector valve 303 also includes a valve cover 309 connected to the valve body 304; the valve core 305 is also slidably connected to the valve cover 309 and cooperates with the valve cover 309 to form a sealed receiving cavity 310, and a connecting hole 311 is also formed on the valve core 305 to connect the receiving cavity 310 to the flow channel 306. According to the above structure provided in this embodiment, on the one hand, the slidable connection of the valve core 305 to the valve cover 309 can improve its sliding stability; on the other hand, the connecting hole 311 formed on the valve core 305 can make the pressure in the receiving cavity 310 and the pressure in the flow channel 306 approximately balanced, thereby facilitating the sliding of the valve core 305, which can further improve the reliability of the fire extinguishing system.

[0042] In another embodiment of this application, please refer to [the relevant document / reference]. Figures 1 to 5The limiting structure includes a rotating shaft 312 and a limiting shaft 313 that are rotatably mounted on the valve cover 309 and are arranged in parallel at intervals. It also includes a stop 314 connected to the rotating shaft 312 and capable of rotating with the rotating shaft 312, a swing arm 315 connected to the limiting shaft 313, and a cylinder body 316 mounted on the valve body 304. A locking lug 317 is formed at one end of the stop 314 near the limiting shaft 313. A notch 318 is formed on the limiting shaft 313 that can lock through the locking lug 317. The valve core 305 passes through the valve cover 309 and abuts against the stop 314. The cylinder body 316 forms a control air passage 319 that connects the control air inlet 307 and the control air outlet 308, and a cylinder piston 320 that is movably disposed in the control air passage 319. The end of the swing arm 315 away from the limiting shaft 313 interferes with the movement path of the cylinder piston 320 and can be driven by the cylinder piston 320 to swing.

[0043] According to the structure provided in this embodiment, when the airflow in the starting gas cylinder 203 enters the control gas channel 319 from the control gas inlet 307, it can drive the cylinder piston 320 to move. During the movement, the cylinder piston 320 can drive the swing arm 315 to swing by abutting against the swing arm 315. Since the limiting shaft 313 is connected to the swing arm 315, the limiting shaft 313 can be rotated by the swing arm 315, thereby aligning the notch 318 on the limiting shaft 313 with the snap-fit ​​ear 317 formed on the stop block 314. In this way, the snap-fit ​​ear 317 can slide out from the notch 318, lose its obstruction and break the snap-fit ​​relationship. Thus, the stop block 314 can lose its limiting effect on the valve core 305. When the valve core 305 is pushed by the fire-fighting medium, the stop block 314 can smoothly rotate around the rotating shaft 312, leaving a channel for the displacement of the valve core 305, which is conducive to the normal opening of the flow channel 306. In this embodiment, since the cylinder piston 320 can stably drive the swing arm 315 to swing, the stop block 314 can be stably driven and lose its limit on the valve core 305, which can further improve the reliability of the fire extinguishing system.

[0044] In another embodiment of this application, please refer to [the relevant document / reference]. Figures 1 to 5 The limiting structure also includes a positioning shaft 321 disposed between the rotating shaft 312 and the limiting shaft 313, and a torsion spring 322 connected to the positioning shaft 321; the swing arm 315 is connected to the torsion spring 322 and generates a tendency to return to the initial position through the torsion spring 322. According to the above structure provided in this embodiment, the tension spring connected between the swing arm 315 and the positioning shaft 321 can drive the swing arm 315 to always tend to the reset state, that is, during fire duty, the outer circular surface of the limiting shaft 313 is always in contact with the locking lug 317, keeping the stop block 314 in a stable limiting state, which can further improve the reliability of the fire extinguishing system.

[0045] In another embodiment of this application, please refer to [the relevant document / reference]. Figures 1 to 5 The limiting structure also includes a manual handle 323 connected to the limiting shaft 313 and capable of driving the limiting shaft 313 to rotate. According to the structure provided in this embodiment, the manual handle 323 connected to the limiting shaft 313 allows the user to manually rotate the limiting shaft 313 in an emergency to unlock the selector valve 303, which can further improve the reliability of the fire extinguishing system.

[0046] In another embodiment of this application, please refer to [the relevant document / reference]. Figures 1 to 5 The limiting structure also includes a screw 324 threaded onto the valve cover 309; the axial direction of the screw 324 is parallel to the moving direction of the valve core 305, and the stop block 314 abuts against the valve core 305 via the screw 324. According to the structure provided in this embodiment, the screw 324 can adjust the degree of contact with the valve core 305 by rotating relative to the valve cover 309. This allows for flexible adjustment of the sliding range of the valve core 305, improving the sensitivity of the selector valve 303, and thus further enhancing the reliability of the fire extinguishing system.

[0047] In another embodiment of this application, please refer to [the relevant document / reference]. Figures 1 to 5 The valve body assembly also includes low-leakage, high-sealing valves 325 respectively installed on the connecting pipe 401, the gas control pipe 402, and the manifold 502. In this embodiment, the low-leakage, high-sealing valve 325 is a commonly used valve in the art. Its function is to slowly release trace amounts of gas that may accumulate in the pipeline due to seal penetration or changes in ambient temperature, thereby ensuring that the internal pressure of the pipeline is always maintained below the normal operating pressure, avoiding system malfunctions or component damage caused by abnormal pressure increases. Simultaneously, the low-leakage, high-sealing valve 325 is characterized by automatically sealing when the system starts normally and the pressure in the pipeline rapidly rises to the operating pressure, ensuring the complete pressure and flow of the driving gas or extinguishing agent, without affecting the normal start-up and extinguishing efficiency of the fire extinguishing system. By continuously maintaining stable pressure in the pipeline in standby mode, the safety and reliability of the entire fire extinguishing system are further improved.

[0048] In another embodiment of this application, please refer to [the relevant document / reference]. Figures 1 to 5 The valve body assembly also includes a one-way valve 326; the one-way valve 326 is disposed on the gas control pipe 402 between the selector valve 303 and the cylinder head valve 302 and enables unidirectional flow from the cylinder head valve 302 to the selector valve 303. According to the structure provided in this embodiment, the addition of a one-way valve 326 to the gas control pipe 402 between the selector valve 303 and the cylinder head valve 302 ensures that the starting gas flow can only flow unidirectionally from the starting gas cylinder 203 through the cylinder head valve 302 to the selector valve 303 and the subsequent container valve 301, effectively preventing the possibility of reverse flow of gas flow. This can further improve the stability and reliability of the fire extinguishing system in complex application scenarios.

[0049] In another embodiment of this application, please refer to [the relevant document / reference]. Figures 1 to 5 The sprinkler assembly also includes a signal feedback device 327 for transmitting sprinkler signals. The signal feedback device 327 is located on the manifold 502 between the selector valve 303 and the sprinkler head 501. In this embodiment, the signal feedback device 327 can be a pressure sensor or flow sensor commonly used in the art. According to the mechanism provided in this embodiment, when the system is started and the extinguishing agent is successfully sprayed, the fire-fighting medium pressure or flow signal generated in the manifold 502 will immediately trigger the signal feedback device 327, causing it to generate a clear electrical signal or mechanical indication, and transmit this "sprayed" status signal to the fire control center or linkage control system. This provides managers with direct evidence of successful fire-fighting action, realizing visualized monitoring of the fire-fighting process, which can further improve the stability and reliability of the fire-fighting system in complex application scenarios.

[0050] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. An externally pressurized perfluorohexanone fire extinguishing device, characterized in that, include: Box (100); The cylinder assembly includes a fire extinguishing agent cylinder (201) and a driving gas cylinder (202) disposed inside the housing (100), and also includes an activation gas cylinder (203) disposed outside the housing (100). The valve body assembly includes a container valve (301) that can be pneumatically opened and closed, and a bottle head valve (302) that can be manually or electromagnetically opened and closed. The container valve (301) is installed on the extinguishing agent bottle (201) and the driving gas cylinder (202), respectively, and the bottle head valve (302) is installed on the starting gas cylinder (203). The connecting fitting includes a connecting pipe (401) connecting the outlet of the container valve (301) on the driving gas cylinder (202) and the extinguishing agent cylinder (201) for connecting the extinguishing agent cylinder (201) and the driving gas cylinder (202), and also includes a gas control pipe (402) connecting the control end of the container valve (301) and the cylinder head valve (302). The spray assembly includes a nozzle (501) and a manifold (502) connecting the nozzle (501) and the extinguishing agent cylinder (201).

2. The externally pressurized perfluorohexanone fire extinguishing device as described in claim 1, characterized in that: The valve body assembly also includes a selector valve (303); The selector valve (303) includes a valve body (304), a valve core (305), and a limiting structure. The valve body (304) forms a flow channel (306) communicating with the manifold (502). The valve core (305) is slidably connected to the valve body (304) and can open or close the flow channel (306) during sliding relative to the valve body (304). The valve core (305) also forms a cross-sectional shape in its sliding direction that is adapted to the flow channel (306) so that it can be controlled by the flow channel (306). Driven by the fire-fighting medium in the valve body (304), the limiting structure includes a control air inlet (307) and a control air outlet (308) formed on the valve body (304) and connected to each other. The limiting structure is connected to the bottle head valve (302) through the control air inlet (307) and can be controlled by the bottle head valve (302) to limit or release the sliding of the valve core (305). The bottle head valve (302) is connected to the control end of the container valve (301) in sequence through the control air inlet (307) and the control air outlet (308).

3. The externally pressurized perfluorohexanone fire extinguishing device as described in claim 2, characterized in that: The selector valve (303) also includes a valve cover (309) connected to the valve body (304); The valve core (305) is also slidably connected to the valve cover (309) and cooperates with the valve cover (309) to form a sealed receiving cavity (310). A connecting hole (311) is also formed on the valve core (305) to connect the receiving cavity (310) to the flow channel (306).

4. The externally pressurized perfluorohexanone fire extinguishing device as described in claim 3, characterized in that: The limiting structure includes a rotating shaft (312) and a limiting shaft (313) that are rotatably mounted on the valve cover (309) and arranged in parallel at intervals. It also includes a stop (314) connected to the rotating shaft (312) and capable of rotating with the rotating shaft (312), a swing arm (315) connected to the limiting shaft (313), and a cylinder body (316) mounted on the valve body (304). The stop (314) has a locking lug (317) at one end near the limiting shaft (313), and a notch (318) is formed on the limiting shaft (313) that can pass through the locking lug (317). The valve core (305) passes through the valve cover (309) and abuts against the stop (314). The cylinder body (316) forms a control air passage (319) that connects the control air inlet (307) and the control air outlet (308) and a cylinder piston (320) that is movably disposed in the control air passage (319). The end of the swing arm (315) away from the limiting shaft (313) interferes with the movement path of the cylinder piston (320) and can be driven by the cylinder piston (320) to swing.

5. The externally pressurized perfluorohexanone fire extinguishing device as described in claim 4, characterized in that: The limiting structure also includes a positioning shaft (321) disposed between the rotating shaft (312) and the limiting shaft (313) and a torsion spring (322) connected to the positioning shaft (321). The swing arm (315) is connected to the torsion spring (322) and generates a tendency to return to the initial position through the torsion spring (322).

6. The externally pressurized perfluorohexanone fire extinguishing device as described in claim 4, characterized in that: The limiting structure also includes a manual handle (323) connected to the limiting shaft (313) and capable of driving the limiting shaft (313) to rotate.

7. The externally pressurized perfluorohexanone fire extinguishing device as described in any one of claims 4-6, characterized in that: The limiting structure also includes a screw (324) threaded onto the valve cover (309). The axial direction of the screw (324) is parallel to the moving direction of the valve core (305), and the stop (314) abuts against the valve core (305) through the screw (324).

8. The externally pressurized perfluorohexanone fire extinguishing device as described in claim 7, characterized in that: The valve body assembly also includes a low-leakage high-seal valve (325) respectively disposed on the connecting pipe (401), the pneumatic control pipe (402) and the manifold (502).

9. The externally pressurized perfluorohexanone fire extinguishing device as described in claim 8, characterized in that: The valve body assembly also includes a one-way valve (326). The one-way valve (326) is disposed on the pneumatic control tube (402) between the selector valve (303) and the bottle head valve (302) and enables one-way flow from the bottle head valve (302) to the selector valve (303).

10. The externally pressurized perfluorohexanone fire extinguishing device as described in claim 8, characterized in that: The spray assembly further comprises a signal feedback device (327) for feeding back a spray signal, which signal feedback device (327) is arranged on the manifold (502) between the selection valve (303) and the spray head (501).

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