A thermal aerosol fire extinguishing method

Abstract

This invention relates to a thermal aerosol fire extinguishing method. First, thermal aerosol gas is projected in a cone shape towards the fire source, completely covering it and driving away the surrounding oxygen, thus extinguishing the fire. Then, the thermal aerosol gas is projected in a cone shape towards the fire source, covering it to prevent the surrounding oxygen from re-contacting the fire and causing reignition. The first objective of this invention is to provide a thermal aerosol fire extinguishing method that consumes less aerosol when isolating oxygen, solving the problem of high aerosol consumption in existing aerosol fire extinguishers.

Description

Technical Field

[0001] This invention relates to fire extinguishers, and more particularly to a thermal aerosol fire extinguishing method. Background Technology

[0002] A fire extinguisher is a tool used to extinguish fires. It contains chemicals to put out fires. Fire extinguishers are common fire prevention facilities, stored in public places or areas where fires may occur. Different types of fire extinguishers contain different components, designed specifically for different types of fires. Users must be careful when using them to avoid adverse effects and potential dangers. One type of fire extinguisher is the thermal aerosol extinguisher. When a fire occurs, a certain ignition structure ignites the propellant. The heat generated by the combustion of the propellant vaporizes the thermal aerosol and sprays it out. The sprayed thermal aerosol gas covers the fire source, depriving it of oxygen and thus extinguishing the fire. A conventional thermal aerosol fire extinguisher is disclosed in patent application CN201810031343.2, filed on January 12, 2018, entitled "A Handheld Fire Extinguisher and Extinguishing Method".

[0003] Existing hot melt adhesive fire extinguishers have the following shortcomings: the sprayed aerosol is a solid cone shape that covers the fire source, causing the fire to be extinguished due to lack of oxygen. Because the aerosol needs to fill a large space, in order to effectively deoxygenate the fire source, a large amount of aerosol needs to be consumed per unit time (that is, the extinguishing time is short when the amount of aerosol is constant). Summary of the Invention

[0004] The first objective of this invention is to provide a heat-transferring aerosol fire extinguishing method that consumes less aerosol when extinguishing fires in the absence of oxygen, thus solving the problem of large aerosol consumption in existing aerosol fire extinguishers.

[0005] The second objective of this invention is to provide a method for extinguishing fires using a thermal aerosol with an adjustable cone angle during fire extinguishing and isolation, thereby solving the problem that the cone angle of the aerosol emitted by existing aerosol fire extinguishers is not adjustable.

[0006] The above technical problems are solved by the following technical solution: a thermal aerosol fire extinguishing method, in which thermal aerosol gas is first shot towards the fire source in the form of a cone to completely cover the fire source, thereby driving away the oxygen around the fire source and extinguishing the fire source, and then the thermal aerosol gas is shot towards the fire source in the form of a cone to cover the fire source, so as to prevent the oxygen around the fire source from re-contacting the fire source and causing reignition.

[0007] Preferably, a thermal aerosol fire extinguisher is used. The thermal aerosol fire extinguisher includes a shell, which comprises a shell body, a front wall sealed at one end of the shell, and a rear wall sealed at the other end of the shell. The front end of the shell stores thermal aerosol, and the rear end stores a propellant column that vaporizes the thermal aerosol due to heat generated during combustion. The front end of the shell is provided with a thermal melt adhesive gas outlet nozzle, which includes a first circular recess on the front surface of the front wall of the shell, a second circular recess on the bottom wall of the first recess, and an inner propellant column passing through the first circular recess. The inner core has an annular step extending circumferentially between the first and second circular recesses. A shaft head, coaxially arranged within the second circular recess, is provided on the inner core. The inner core is pressed into the first circular recess by a bolt threaded onto the bottom wall of the second circular recess, passing through the shaft of the inner core. The inner core is rotatably connected to the bolt. A first air-jet annular groove extending circumferentially between the inner core and the first circular recess is formed. The inner core covers the annular step, forming a first cavity. The first cavity communicates with the first air-jet annular groove through a connecting channel. A rear end of the annular step penetrates the front end wall of the outer shell. The end face has several external connecting holes, which are evenly distributed along the circumference of the inner core. The inner core is provided with a cover located in the first cavity for correspondingly closing the external connecting holes. The bottom wall of the second circular recess is provided with several internal connecting holes that penetrate the rear end face of the front end wall of the outer shell, which are evenly distributed along the circumference of the inner core. The rear end face of the shaft head is provided with several air jet holes that penetrate the front end face of the inner core. The exhaust holes can be aligned with the internal connecting holes one by one. When the internal connecting holes are directly opposite and connected to the air jet holes, the cover closes the external connecting holes. The cover and the external connecting holes are completely misaligned. When the shaft head is open, all the internal connecting holes are sealed. The specific process of extinguishing the fire is as follows: First, the internal connecting holes are connected to the air jet holes, and the external connecting holes are closed. Aerosol is sprayed from the exhaust hole to form a cone-shaped aerosol curtain that covers the fire source for the set extinguishing time, thereby removing the oxygen around the fire source and extinguishing the fire. Then, the internal connecting holes are disconnected from the air jet holes, and the external connecting holes are opened. Aerosol is sprayed from the first air jet ring groove to form a cone-shaped aerosol curtain that covers the fire source, isolating the fire source from the surrounding air and preventing the oxygen from being removed and then reaching the fire source, thus preventing reignition. However, in existing fire extinguishing systems, the cone-shaped aerosol curtain in the subsequent isolation process to prevent reignition is a solid structure, resulting in a large amount of aerosol used. This technical solution solves this problem and also extends the extinguishing time of the fire extinguisher.

[0008] Preferably, each inner connecting hole has an inner connecting hole sealing ring surrounding its outer perimeter at one end of the second circular recess. The inner connecting hole sealing ring is fixed to the front wall of the outer shell, and the inner connecting hole sealing cavity protrudes from the bottom wall of the second circular recess. The shaft head seals the inner connecting hole through the inner connecting hole sealing cavity. This provides a convenient and reliable seal between the shaft head and the inner connecting hole.

[0009] Preferably, each external connecting hole has an external connecting hole sealing ring surrounding one end of the annular step. The external connecting hole sealing cavity is fixed to the front wall of the outer shell and protrudes from the annular step. The hole cover seals the external connecting hole through the external connecting hole sealing cavity. This facilitates sealing the hole cover and the external connecting hole.

[0010] Preferably, a first limiting block and a second limiting block are fixedly connected within the first cavity. The first and second limiting blocks are distributed circumferentially along the inner core, and at least one of the hole covers is located between the first and second limiting blocks. When the inner core rotates in one direction until the hole cover between the first and second limiting blocks abuts against the first limiting block and cannot rotate further, the hole cover seals the external communication hole one-to-one, and the air vent aligns one-to-one with the internal communication hole. When the inner core rotates in another direction until the hole cover between the first and second limiting blocks abuts against the second limiting block and cannot rotate further, the shaft head seals all possible internal communications, and the external communication hole is offset from the hole cover. This allows for easy identification of whether the inner core has rotated to the desired position.

[0011] Preferably, the inner core has an inner core recess on its front end face, the inner connecting hole penetrates the bottom wall of the inner core recess, the bolt is connected to the bottom wall of the inner core recess, and the circumferential surface of the inner core recess is a conical surface with a larger front end and a smaller rear end. This ensures that the hot melt adhesive isolation curtain of the solid structure isolates the area within a set range.

[0012] Preferably, the outer end face of the inner core is provided with a force-bearing structure for rotating the inner core. This makes it convenient to apply force when rotating the inner core.

[0013] Preferably, the force-increasing structure is a resistance-increasing push block disposed on the outer end face of the inner core or a resistance-increasing pit recessed on the outer end face of the inner core for finger insertion.

[0014] Preferably, the first air jet annular groove is a conical groove with a smaller inlet end and a larger outlet end. This ensures that the spread range of the hollow hot melt adhesive curtain is within a set range.

[0015] Preferably, the front end of the first circular recess has a large-diameter section, and an annular expansion cavity extending circumferentially along the inner core is provided between the large-diameter section and the first circular recess. An inner isolation ring and an outer isolation ring are nested together within the large-diameter section, and the inner core passes through the inner isolation ring. The inner and outer isolation rings are fixed to the front end wall of the outer shell. The inner isolation ring and the inner core form the first jet ring groove, the inner isolation ring and the outer isolation ring form a second jet ring groove, and the outer isolation ring and the large-diameter section form a third jet ring groove. Both the second and third jet ring grooves are tapered grooves with a larger front end and a smaller rear end. The cone angles of the first, second, and third jet ring grooves are all unequal. The inlet ends of the first, second, and third jet annular grooves all penetrate the annular expansion cavity, which is connected to the first cavity via the connecting channel. The inner end of the first jet annular groove has an openable first jet annular groove closure structure, the inner end of the second jet annular groove has an openable second jet annular groove closure structure, and the inner end of the third jet annular groove has an openable third jet annular groove closure structure. During the fire extinguishing process of a conical aerosol curtain with a conical structure, different jet annular grooves are selected for ejection, resulting in different cone angles for the conical aerosol curtain. This satisfies the fire extinguishing requirements for fire sources of different sizes while maintaining the same extinguisher position. This achieves the second objective of the invention.

[0016] Preferably, the rear end of the front wall of the outer casing has a small-diameter section, forming an inverted step with the front wall of the outer casing; the rear end of the inner isolation ring has an inner isolation ring connecting rod, which has an inner isolation ring clamping block abutting against the inner surface of the expansion cavity and an inner isolation ring threaded head extending out of the inverted step. The inner isolation ring threaded head is threadedly connected to an inner isolation ring clamping nut, which, in conjunction with the inner isolation ring clamping block, fixes the inner isolation ring connecting rod to the front wall of the outer cover; the inner end of the outer isolation ring has an outer isolation ring connecting rod, which has an outer isolation ring clamping block abutting against the inner surface of the expansion cavity and an outer isolation ring threaded head extending out of the inverted step. The outer isolation ring threaded head is threadedly connected to an outer isolation ring clamping nut, which, in conjunction with the outer isolation ring clamping block, fixes the outer isolation ring connecting rod to the front wall of the outer cover. This provides a convenient method for fixing the isolation ring to the front cover of the outer casing.

[0017] Preferably, the first jet ring groove sealing structure includes a first opening spring, a first annular cover plate for closing the rear port of the first jet ring groove, a first guide rod fixed together with the expansion cavity and threaded onto the first cover plate, and a first threaded rod with its outer end located outside the front wall of the outer casing and threadedly connected to the wall of the expansion cavity. The first annular cover plate is connected to one end of a first push rod. The first threaded rod has a first conical lifting surface extending circumferentially along the first threaded rod. The first threaded rod abuts against the first conical lifting surface under the drive of the first opening spring. The first opening spring is used to drive the first annular cover plate to move along the extension direction of the first guide rod to open it. The extension direction of the first guide rod is perpendicular to the first threaded rod. The second jet ring groove sealing structure includes a second opening spring, a second annular cover plate for closing the inner port of the second jet ring groove, a second guide rod fixed together with the expansion cavity and threaded onto the second cover plate, and a second threaded rod with its outer end located outside the front wall of the outer tube and threadedly connected to the wall of the expansion cavity. The second annular cover plate is connected to one end of a second push rod. The ends are connected together. The second threaded rod has a second conical lifting surface extending circumferentially along the second threaded rod. The second threaded rod abuts against the second conical lifting surface under the drive of the second opening spring. The second opening spring is used to drive the second annular cover plate to move along the extension direction of the second guide rod to open. The extension direction of the second guide rod is perpendicular to the second threaded rod. The third jet annular groove sealing structure includes a third opening spring, a third annular cover plate for closing the inner port of the third jet annular groove, a third guide rod fixed together with the expansion cavity and threadedly connected to the wall of the expansion cavity with its outer end located outside the front end wall of the outer tube. The third annular cover plate is connected to one end of the third push rod. The third threaded rod has a third conical lifting surface extending circumferentially along the third threaded rod. The third threaded rod abuts against the third conical lifting surface under the drive of the third opening spring. The third opening spring is used to drive the third annular cover plate to move along the extension direction of the third guide rod to open. The extension direction of the third guide rod is perpendicular to the third threaded rod. In use, the annular cover is raised or lowered by rotating the threaded rod, which opens the corresponding jet ring groove to spray aerosol for fire extinguishing.

[0018] This invention has the following beneficial effects: it can deprive the fire source of oxygen by forming an aerosol isolation shell, which is equivalent to the current aerosol isolation physical method, and can save the amount of aerosol used; the cone angle of the cone-shaped aerosol isolation curtain used to deprive the fire source of oxygen is adjustable, so that the aerosol isolation curtain can be adjusted to the optimal size according to the size of the fire source. If it is too small, it cannot isolate the fire source and thus cannot extinguish the fire; if it is too large, it will result in a low fire extinguishing efficiency ratio (the efficiency ratio refers to the ratio of the oxygen-blocking effect of the aerosol in the formed isolation curtain to the amount of aerosol in the formed isolation film. The higher the ratio, the higher the fire extinguishing efficiency ratio. When the amount of aerosol used and the distance from the fire source are constant, the smaller the cone angle of the aerosol film sprayed by water, the higher the fire extinguishing efficiency ratio. When the amount of aerosol used and the cone angle of the aerosol curtain are constant, the closer the distance from the fire source, the higher the fire extinguishing efficiency ratio). Attached Figure Description

[0019] Figure 1 This is a cross-sectional schematic diagram of the thermal aerosol fire extinguisher in Example 1;

[0020] Figure 2 This is a cross-sectional schematic diagram of the front wall of the outer shell in Embodiment 1;

[0021] Figure 3 This is a front view of the front cover of the outer casing;

[0022] Figure 4 for Figure 3 BB cross-sectional diagram;

[0023] Figure 5 for Figure 2 A magnified view of a portion of point C;

[0024] Figure 6 This is a cross-sectional schematic diagram of the front wall of the outer shell in Embodiment 2;

[0025] Figure 7 for Figure 6 A magnified view of a portion of point D;

[0026] Figure 8 for Figure 7 A magnified view of a portion of point E;

[0027] Figure 9 for Figure 6 A magnified view of a portion of point G.

[0028] In the diagram: 1. Outer shell; 2. Outer shell body; 3. Front wall of outer shell; 4. Rear wall of outer shell; 5. Hot aerosol; 6. Glue cartridge; 7. Hot melt adhesive gas outlet nozzle; 14. First circular recess; 15. Second circular recess; 16. Inner core; 17. Annular step; 18. Shaft head; 19. Bolt; 20. First air jet groove; 21. First cavity; 22. Connecting channel; 23. External connecting hole; 24. Hole cover; 25. Internal connecting hole; 26. Air jet hole; 27. Internal connecting hole sealing ring; 28. External connecting hole sealing ring; 29. ​​Chamfered surface; 30. First limiting block; 33. Second limiting block; 34. Hole cover located between the first and second limiting blocks; 35. Inner core recess; 37. Large diameter section; 38. Annular expansion cavity; 39. Inner isolation ring; 40. External isolation ring; 41. Second air jet groove; 42. Third air jet groove; 43. Inverted step; 44. Connecting rod of inner isolation ring; 45. Isolation ring clamping block, 46. Inner isolation ring threaded head, 47. Inner isolation ring clamping nut, 48. Outer isolation ring connecting rod, 49. Outer isolation ring clamping block, 50. Outer isolation ring threaded head, 51. Outer isolation ring clamping nut, 52. First cover opening spring, 53. First annular cover plate, 69. First threaded rod, 54. First push rod, 55. First conical lifting surface, 56. Second cover opening spring, 57. Second annular cover plate, 58. Second guide rod, 59. Second threaded rod, 60. Second push rod, 61. Second conical lifting surface, 62. Third cover opening spring, 63. Third annular cover plate, 64. Third guide rod, 65. Third threaded rod, 66. Third push rod, 67. Third conical lifting surface, 68. First air jet groove sealing structure, 70. Second air jet groove sealing structure, 71. Third air jet groove sealing structure, 72. Detailed Implementation

[0029] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] Example 1, see Figures 1 to 5 A thermal aerosol fire extinguishing method involves first projecting thermal aerosol gas in a cone shape towards the fire source, completely covering it and driving away the surrounding oxygen to extinguish the fire. Then, the thermal aerosol gas is projected in a cone shape towards the fire source, covering it to prevent the surrounding oxygen from re-contacting the fire and causing reignition.

[0031] Specifically, this is achieved through, but not limited to, the following thermal aerosol fire extinguisher: The thermal aerosol fire extinguisher includes a shell 1, which comprises a cylindrical shell body 2, a front shell wall 3 covering one end of the shell, and a rear shell wall 4 sealing the other end of the shell. The front end of the shell stores thermal aerosol 5, and the rear end stores a propellant column 6 that vaporizes the thermal aerosol due to the heat generated during combustion. The front end of the shell is equipped with a thermal aerosol gas outlet 7.

[0032] The hot melt adhesive gas outlet nozzle includes a first circular recess 14 on the front surface of the front wall of the outer shell, a second circular recess 15 on the bottom wall of the first recess, and an inner core 16 passing through the first circular recess. An annular step 17 extending circumferentially along the inner core is formed between the first and second circular recesses. A shaft head 18, coaxially arranged within the second circular recess, is provided on the inner core. The inner core is pressed into the first circular recess by a bolt 19 threaded through the shaft of the inner core and attached to the bottom wall of the second circular recess. The inner core is rotatably connected to the bolt (i.e., the inner core can rotate within the front wall of the outer shell). A first air jet annular groove 20 extending circumferentially along the inner core is formed between the inner core and the first circular recess. The inner core covers the annular step to form a first cavity 21, which is connected to the first air jet annular groove via a connecting channel 22. The first air jet annular groove is a conical groove with a smaller inlet end and a larger outlet end. The annular step has several external connecting holes 23 that penetrate the rear end face of the front wall of the outer shell. These external connecting holes are evenly distributed along the circumference of the inner core. The inner core has a cover 24 located in the first cavity to seal the external connecting holes one by one. The bottom wall of the second circular recess has several internal connecting holes 25 that penetrate the rear end face of the front wall of the outer shell. These internal connecting holes are evenly distributed along the circumference of the inner core. The rear end face of the shaft head has several air vents 26 that penetrate the front end face of the inner core. The air vents can be aligned one by one with the internal connecting holes. When the internal connecting holes are directly opposite and connected to the air vents, the cover seals the external connecting holes. When the cover is completely offset from the external connecting holes, the shaft head seals all the internal connecting holes. Each internal connecting hole has an internal connecting hole sealing ring 27 at one end of the second circular recess. The internal connecting hole sealing ring is fixed to the front wall of the outer shell. The internal connecting hole sealing cavity protrudes from the bottom wall of the second circular recess, and the shaft head seals the internal connecting hole through the internal connecting hole sealing cavity. Each external connecting hole has an external connecting hole sealing ring 28 surrounding one end of the annular step. The external connecting hole sealing cavity is fixed to the front wall of the outer shell and protrudes from the annular step. The hole cover seals the external connecting hole through the external connecting hole sealing cavity. The edge of the hole cover facing the external connecting hole sealing ring has a chamfered surface 29 that extends circumferentially along the external connecting hole sealing cavity when the hole cover is pressed on the external connecting hole sealing ring. The chamfered surface allows the hole cover to be easily moved onto the external connecting hole sealing ring during rotation. A first limiting block 30 and a second limiting block 33 are fixedly connected within the first cavity. The first and second limiting blocks are distributed circumferentially along the inner core, and at least one hole cover is located between the first and second limiting blocks. When the inner core rotates in one direction until the hole cover 34 located between the first and second limiting blocks abuts against the first limiting block and cannot continue to rotate, the hole cover seals the external communication hole one-to-one, and the air jet hole aligns one-to-one with the internal communication hole. When the inner core rotates in another direction until the hole cover located between the first and second limiting blocks abuts against the second limiting block and cannot continue to rotate, the shaft head seals all possible internal communications, and the external communication hole is offset from the hole cover.The inner core has a recessed core 35 on its front end face, and an internal connecting hole penetrates the bottom wall of the recessed core. A bolt is connected to the bottom wall of the recessed core. The circumferential surface of the recessed core is a conical surface that is larger at the front end and smaller at the rear end. For easy rotation, a rotating recess is provided on the outer end face of the inner core. When in use, the inner core is rotated by placing a finger in the rotating recess.

[0033] The fire extinguishing process is as follows: First, the inner core is rotated to connect the inner connecting hole with the jet hole and close the outer connecting hole. Aerosol is sprayed out from the exhaust hole to form a cone-shaped aerosol curtain (i.e., the existing fire extinguishing method) to extinguish the fire for a set time, thereby removing the oxygen around the fire source. Then, the inner core is rotated to disconnect the inner connecting hole from the jet hole and open the outer connecting hole. Aerosol is sprayed out from the first jet ring groove to form a cone-shaped aerosol curtain with a shell structure (i.e., a hollow structure), which isolates the fire source from the surrounding air and prevents the oxygen from being removed and then reaching the fire source, causing reignition.

[0034] Example 2 differs from Example 1 in that:

[0035] See Figures 6 to 9 The first circular recess has a large-diameter section 37 at its front end. Between the large-diameter section and the first circular recess is an annular expansion cavity 38 extending circumferentially along the inner core. An inner isolation ring 39 and an outer isolation ring 40 are nested together within the large-diameter section. The inner core passes through the inner isolation ring. The inner and outer isolation rings are fixed to the front wall of the outer shell. The inner isolation ring and the inner core form a first jet ring groove 20. The inner and outer isolation rings form a second jet ring groove 41. The outer isolation ring and the large-diameter section form a third jet ring groove 42. Both the second and third jet ring grooves are conical grooves, larger at the front end and smaller at the rear end. The cone angles of the first, second, and third jet ring grooves are not equal (specifically, they increase sequentially). The inlet ends of the first, second, and third jet ring grooves all penetrate the annular expansion cavity. The annular expansion cavity is connected to the first cavity through a connecting channel. The inner end of the first jet ring groove is provided with an openable first jet ring groove sealing structure 70, the inner end of the second jet ring groove is provided with an openable second jet ring groove sealing structure 71, and the inner end of the third jet ring groove is provided with an openable third jet ring groove sealing structure 72.

[0036] Specifically: The rear end of the front wall of the outer shell has a small diameter section, forming an inverted step 43 between the small diameter section and the front wall of the outer shell. The rear end of the inner isolation ring has an inner isolation ring connecting rod 44, which has an inner isolation ring clamping block 45 that abuts against the inner surface of the expansion cavity and an inner isolation ring threaded head 46 that extends out of the inverted step. The inner isolation ring threaded head is threadedly connected to an inner isolation ring clamping nut 47, which, together with the inner isolation ring clamping block, fixes the inner isolation ring connecting rod to the front wall of the outer cover. The inner end of the outer isolation ring has an outer isolation ring connecting rod 48, which has an outer isolation ring clamping block 49 that abuts against the inner surface of the expansion cavity and an outer isolation ring threaded head 50 that extends out of the inverted step. The outer isolation ring threaded head is threadedly connected to an outer isolation ring clamping nut 51, which, together with the outer isolation ring clamping block, fixes the outer isolation ring connecting rod to the front wall of the outer cover.The first jet annular groove sealing structure includes a first cover-opening spring 52, a first annular cover plate 53 for closing the rear port of the first jet annular groove, a first guide rod 69 that passes through the first cover plate and is fixed together with the expansion cavity (specifically fixed on the inner isolation ring), and a first threaded rod 54 that is threadedly connected to the wall of the expansion cavity and whose outer end is located outside the front wall of the outer shell. The first annular cover plate is connected to one end of the first push rod 55. The first threaded rod has a first conical lifting surface 56 that extends circumferentially along the first threaded rod. The first threaded rod abuts against the first conical lifting surface under the drive of the first cover-opening spring. The first opening spring drives the first annular cover plate to move along the extension direction of the first guide rod to open. The extension direction of the first guide rod is perpendicular to the first threaded rod. In use, by rotating the first threaded rod in conjunction with the first opening spring, the first annular cover plate is raised and lowered, thereby opening and closing the first annular jet groove. The second jet groove closing structure includes a second opening spring 57, a second annular cover plate 58 for closing the inner port of the second jet groove, a second guide rod 59 that passes through the second cover plate and is fixed together with the expansion cavity (specifically, the outer isolation ring), and a threaded connection to the wall of the expansion cavity with its outer end located in front of the outer tube. The second threaded rod 60 on the outside of the end wall, the second annular cover plate and the second push rod 61 are connected to one end. The second threaded rod has a second conical lifting surface 62 extending circumferentially along the second threaded rod. The second threaded rod abuts against the second conical lifting surface under the drive of the second opening spring. The second opening spring is used to drive the second annular cover plate to move along the extension direction of the second guide rod to open. The extension direction of the second guide rod is perpendicular to the second threaded rod. The third air jet groove sealing structure includes a third opening spring 63, a third annular cover plate 64 for closing the inner port of the third air jet groove, and a cover plate 64 passing through the third cover plate. The third guide rod 65 is fixed together with the expansion cavity (specifically fixed to the front wall of the outer shell) and the third threaded rod 66 is threadedly connected to the wall of the expansion cavity, with its outer end located outside the front wall of the outer tube. The third annular cover plate is connected to one end of the third top rod 67. The third threaded rod is provided with a third conical lifting surface 68 extending circumferentially along the third threaded rod. The third threaded rod abuts against the third conical lifting surface under the drive of the third opening spring. The third opening spring is used to drive the third annular cover plate to move along the extension direction of the third guide rod to open. The extension direction of the third guide rod is perpendicular to the third threaded rod.

[0037] In use, when the external connecting hole is opened, the corresponding jet ring groove is closed or opened by the corresponding jet ring groove sealing structure, and only one jet ring groove is open at any given time.

Claims

1. A method for extinguishing fires using thermal aerosols, characterized in that, First, the thermal aerosol gas is shot towards the fire source in the form of a cone to completely cover the fire source, thereby driving away the oxygen around the fire source and extinguishing the fire source. Then, the thermal aerosol gas is shot towards the fire source in the form of a cone to cover the fire source, so as to prevent the oxygen around the fire source from re-contacting the fire source and causing reignition. This is achieved using a thermal aerosol fire extinguisher. The thermal aerosol fire extinguisher includes a shell, which comprises a shell body, a front wall sealed at one end of the shell, and a rear wall sealed at the other end of the shell. The front end of the shell stores thermal aerosol, and the rear end stores a propellant column that vaporizes the thermal aerosol due to heat generated during combustion. The front end of the shell is provided with a thermal melt adhesive gas outlet nozzle. The thermal melt adhesive gas outlet nozzle includes a first circular recess on the front surface of the front wall of the shell, a second circular recess on the bottom wall of the first recess, and an inner core penetrating the first circular recess. An annular step extending circumferentially along the inner core is formed between the second and third circular recesses. The inner core is coaxially provided with a shaft end passing through the second circular recess. The inner core is pressed into the first circular recess by a bolt threaded onto the bottom wall of the second circular recess, passing through the shaft of the inner core. The inner core is rotatably connected to the bolt. A first air-jet annular groove extending circumferentially along the inner core is formed between the inner core and the first circular recess. The inner core covers the annular step, forming a first cavity. The first cavity communicates with the first air-jet annular groove through a connecting channel. The annular step has a rear end face that penetrates the front end wall of the outer shell. Several external connecting holes are evenly distributed along the circumference of the inner core. The inner core has a cover located within the first cavity to correspondingly close each of the external connecting holes. The bottom wall of the second circular recess has several internal connecting holes that penetrate the rear end face of the front end wall of the outer shell. These internal connecting holes are evenly distributed along the circumference of the inner core. The rear end face of the shaft head has several air vents that penetrate the front end face of the inner core. The air vents can be aligned with the internal connecting holes one by one. When the internal connecting holes are directly opposite and connected to the air vents, the cover closes the external connecting holes. When the cover is completely offset from the external connecting holes... The shaft head seals all the internal connecting holes; the specific process of extinguishing the fire is as follows: first, the internal connecting holes are connected to the air jet holes, and the external connecting holes are closed. When the aerosol is sprayed from the exhaust hole to form a cone-shaped aerosol curtain covering the fire source for the set extinguishing time, the oxygen around the fire source is removed, thereby extinguishing the fire source; then, the internal connecting holes are disconnected from the air jet holes, and the external connecting holes are opened. The aerosol is sprayed from the first air jet ring groove to form a cone-shaped aerosol curtain covering the fire source, thus isolating the fire source from the surrounding air and preventing the oxygen from being removed and then reaching the fire source again, causing reignition.

2. The thermal aerosol fire extinguishing method according to claim 1, characterized in that, Each inner connecting hole is provided with an inner connecting hole sealing ring around the outer perimeter of the second circular recess at one end. The inner connecting hole sealing ring is fixed together with the front wall of the outer shell. The inner connecting hole sealing cavity protrudes from the bottom wall of the second circular recess, and the shaft head seals the inner connecting hole through the inner connecting hole sealing cavity.

3. The thermal aerosol fire extinguishing method according to claim 1, characterized in that, Each external connecting hole is provided with an external connecting hole sealing ring around the outer perimeter of the annular step at one end. The external connecting hole sealing cavity is fixed together with the front wall of the outer shell and protrudes from the annular step. The hole cover seals the external connecting hole through the external connecting hole sealing cavity.

4. The thermal aerosol fire extinguishing method according to claim 1, characterized in that, A first limiting block and a second limiting block are fixedly connected within the first cavity. The first limiting block and the second limiting block are distributed circumferentially along the inner core. At least one of the hole covers is located between the first limiting block and the second limiting block. When the inner core rotates in one direction until the hole cover located between the first limiting block and the second limiting block abuts against the first limiting block and can no longer rotate, the hole cover seals the outer connecting hole one-to-one, and the air jet hole aligns one-to-one with the inner connecting hole. When the inner core rotates in another direction until the hole cover located between the first limiting block and the second limiting block abuts against the second limiting block and can no longer rotate, the shaft head seals all the inner connecting holes, and the outer connecting hole is offset from the hole cover.

5. A thermal aerosol fire extinguishing method according to claim 1, characterized in that, The inner core has an inner core recess on its front end face, and the inner connecting hole penetrates the bottom wall of the inner core recess. The bolt is connected to the bottom wall of the inner core recess, and the circumferential surface of the inner core recess is a conical surface with a larger front end and a smaller rear end.

6. The thermal aerosol fire extinguishing method according to claim 1, characterized in that, The first jet ring groove is a conical groove with a smaller inlet end and a larger outlet end.

7. A thermal aerosol fire extinguishing method according to claim 6, characterized in that, The first circular recess has a large-diameter section at its front end. Between the large-diameter section and the first circular recess is an annular expansion cavity extending circumferentially along the inner core. An inner isolation ring and an outer isolation ring are nested together within the large-diameter section. The inner core passes through the inner isolation ring. The inner and outer isolation rings are fixed to the front end wall of the outer shell. The inner isolation ring and the inner core form the first jet ring groove. The inner isolation ring and the outer isolation ring form a second jet ring groove. The outer isolation ring and the large-diameter section form a third jet ring groove. Both the second and third jet ring grooves are tapered grooves, larger at the front end and smaller at the rear end. The cone angles of the first, second, and third jet ring grooves are unequal. The inlet ends of the air ring groove, the second air ring groove, and the third air ring groove all penetrate the annular expansion cavity. The annular expansion cavity is connected to the first cavity through the connecting channel. The inner end of the first air ring groove is provided with an openable first air ring groove sealing structure, the inner end of the second air ring groove is provided with an openable second air ring groove sealing structure, and the inner end of the third air ring groove is provided with an openable third air ring groove sealing structure. During the fire extinguishing process of the conical aerosol curtain with a conical structure, different air ring grooves are selected to spray the aerosol, resulting in different cone angles of the conical aerosol curtain. This allows the fire extinguishing requirements of different fire source sizes to be met without changing the position of the fire extinguisher.

8. A thermal aerosol fire extinguishing method according to claim 7, characterized in that, The rear end of the front wall of the outer casing has a small-diameter section, forming an inverted step with the front wall of the outer casing. The rear end of the inner isolation ring has an inner isolation ring connecting rod, which has an inner isolation ring clamping block that abuts against the inner surface of the expansion cavity and an inner isolation ring threaded head that extends out of the inverted step. The inner isolation ring threaded head is threadedly connected to an inner isolation ring clamping nut, which, in conjunction with the inner isolation ring clamping block, fixes the inner isolation ring connecting rod to the front wall of the outer cover. The inner end of the outer isolation ring has an outer isolation ring connecting rod, which has an outer isolation ring clamping block that abuts against the inner surface of the expansion cavity and an outer isolation ring threaded head that extends out of the inverted step. The outer isolation ring threaded head is threadedly connected to an outer isolation ring clamping nut, which, in conjunction with the outer isolation ring clamping block, fixes the outer isolation ring connecting rod to the front wall of the outer cover.

9. A thermal aerosol fire extinguishing method according to claim 7, characterized in that, The first jet ring groove sealing structure includes a first opening spring, a first annular cover plate for closing the rear port of the first jet ring groove, a first guide rod fixed together with the expansion cavity and threaded onto the first cover plate, and a first threaded rod with its outer end located outside the front wall of the outer casing and threadedly connected to the wall of the expansion cavity. The first annular cover plate is connected to one end of a first push rod. The first threaded rod has a first conical lifting surface extending circumferentially along the first threaded rod. The first threaded rod abuts against the first conical lifting surface under the drive of the first opening spring. The first opening spring is used to drive the first annular cover plate to move along the extension direction of the first guide rod to open it. The extension direction of the first guide rod is perpendicular to the first threaded rod. The second jet ring groove sealing structure includes a second opening spring, a second annular cover plate for closing the inner port of the second jet ring groove, a second guide rod fixed together with the expansion cavity and threaded onto the second cover plate, and a second threaded rod with its outer end located outside the front wall of the outer tube and threadedly connected to the wall of the expansion cavity. The second annular cover plate is connected to one end of a second push rod. Together, the second threaded rod has a second conical lifting surface extending circumferentially along the second threaded rod. The second threaded rod abuts against the second conical lifting surface under the drive of the second opening spring. The second opening spring is used to drive the second annular cover plate to move along the extension direction of the second guide rod to open. The extension direction of the second guide rod is perpendicular to the second threaded rod. The third jet annular groove sealing structure includes a third opening spring, a third annular cover plate for closing the inner port of the third jet annular groove, a third guide rod fixed together with the expansion cavity and threadedly connected to the wall of the expansion cavity with its outer end located outside the front end wall of the outer tube. The third annular cover plate is connected to one end of the third push rod. The third threaded rod has a third conical lifting surface extending circumferentially along the third threaded rod. The third threaded rod abuts against the third conical lifting surface under the drive of the third opening spring. The third opening spring is used to drive the third annular cover plate to move along the extension direction of the third guide rod to open. The extension direction of the third guide rod is perpendicular to the third threaded rod.

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