Compressed air foam fire extinguishing device
By installing baffles and stirring leaves in the mixing room of the compressed air foam fire extinguishing device, the problem of uneven foam size in the prior art is solved, and more efficient air and liquid mixing is achieved, and the fire extinguishing effect and foaming quality are improved.
Patent Information
- Application Number
- CN202510636082.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-05-16
- Publication Date
- 2025-06-27
- Estimated Expiration
- Not applicable · inactive patent
AI Technical Summary
The existing compressed air foam fire extinguishing devices are not premixed when foaming, resulting in uneven foam size, affecting its distribution and covering effect on the surface of the combustion substance.
A compressed air foam fire extinguishing device including a mixing chamber is designed. Multiple baffles and stirring leaves are provided in the mixing chamber. Through the baffles, the flow of air and fire extinguishing liquid is guided, breaking the large bubble structure and dispersing clusters, increasing the contact area between air and liquid, and enhancing the mixing effect.
Through the improved mixing chamber design, the uniformity and efficient mixing of foam are ensured, and the fire extinguishing effect and foaming quality are improved.
Smart Images
Figure CN120204667A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of fire extinguishing devices, and more particularly to a compressed air foam fire extinguishing device. Background Art
[0002] With the development of social economy and the acceleration of urbanization, the risks of various fire accidents are increasing day by day. In order to effectively respond to the fire threat and ensure the safety of people's lives and property, efficient, environmentally friendly and safe fire extinguishing technologies have become the focus of research. The compressed air foam fire extinguishing device mixes water, foam concentrate and compressed air in proportion to generate delicate and stable foam, which has the advantages of high fire extinguishing efficiency, water saving and environmental protection, wide coverage, etc.
[0003] In the prior art, when the common air compression foam fire extinguishing device foams, the liquid and compressed air are directly introduced into the foaming device; however, this way of directly foaming without pre-mixing starts to mix only when entering the foaming components such as the foaming net or the nozzle. Since the mixing time of the two is short and the mixing process is not sufficient, the size of the formed foam is uneven, which will affect its distribution and covering effect on the surface of the combustible. How to invent a compressed air foam fire extinguishing device to solve these problems has become an urgent problem for those skilled in the art. Summary of the Invention
[0004] To make up for the above deficiencies, the present invention provides a compressed air foam fire extinguishing device, aiming to solve the problem that the subsequent foam quality is low due to the direct foaming without pre-mixing of the common compressed foam fire extinguishing device.
[0005] The present invention is implemented as follows: The present invention provides a compressed air foam fire extinguishing device, including a fire extinguishing box and a mixing chamber arranged in the fire extinguishing box. A gas storage tank is installed on one side of the fire extinguishing box. A pressure relief valve is installed at one end of the gas storage tank. A trachea is installed at one end of the pressure relief valve. A liquid storage cavity and an installation groove are respectively formed inside the fire extinguishing box. A diaphragm pump is installed on the inner wall of the installation groove. A liquid inlet pipe and a liquid outlet pipe are respectively installed on the diaphragm pump. A foaming pipe is installed on the inner wall of the installation groove. A spray pipe is installed at one end of the foaming pipe. A spray gun is installed at one end of the spray pipe; The mixing chamber is fixedly arranged in the installation groove. A liquid inlet, a liquid outlet and an air inlet are respectively formed in multiple side walls of the mixing chamber. One end of the liquid inlet is fixedly connected to one end of a liquid outlet pipe. One end of the liquid outlet is fixedly connected to one end of a foaming pipe. One end of the air inlet is fixedly connected to one end of an air pipe. A first baffle, a second baffle and a third baffle are respectively installed on the inner wall of the mixing chamber. An impeller is installed on the inner wall at one end of the first baffle. A mixing assembly is installed at the end of the first baffle away from the impeller. A fixing rod is installed on the outer wall of the first baffle close to the mixing assembly. Multiple mounting rods are installed on the upper outer wall of the fixing rod. A driving bevel gear is installed on the inner wall at the upper end of each mounting rod; The mixing assembly includes a rotating shaft, a first stirring blade, a turntable and a second stirring blade.
[0006] Preferably, the inside of the air storage tank is filled with high-pressure air. A sealing and fixed connection is provided between the foaming pipe and the spray pipe. The inside of the liquid storage cavity is filled with a fire extinguishing liquid. An inlet for adding the fire extinguishing liquid is installed on the upper inner wall of the fire extinguishing box.
[0007] Preferably, a first notch is formed at one end of the first baffle. A second notch is formed at one end of the second baffle. A gap is left between the bottom end of the third baffle and the bottom end of the mixing chamber.
[0008] Preferably, both ends of the impeller are rotatably connected to the inner wall of the first baffle and the mixing chamber respectively. The blades on the impeller are aligned with the air inlet on one side. One end of the fixing rod is fixedly connected to the side wall of the first baffle. One end of the mounting rod is fixedly connected to the side wall of the fixing rod. One end side wall of the driving bevel gear is rotatably connected to the inner wall of the mounting rod.
[0009] Preferably, one end of the rotating shaft is coaxially and fixedly connected to the shaft body of the impeller. Both ends of the rotating shaft are rotatably connected to the inner wall of the first baffle and one side of the mixing chamber respectively. Multiple first stirring blades are fixedly installed in a group around the side wall of the rotating shaft. Multiple groups of the first stirring blades are equidistantly distributed on the side wall of the rotating shaft.
[0010] Preferably, a plurality of annular grooves are equidistantly formed on the side wall of the rotating shaft. A fixing shaft is fixedly connected to the inner wall of the annular groove. A first driven bevel gear is fixedly connected to one end side wall of the fixing shaft. A turntable is rotatably connected to the end of the fixing shaft away from the first driven bevel gear. A second driven bevel gear rotatably connected to the outer wall of the fixing shaft is fixedly connected to one end of the turntable. The first driven bevel gear and the second driven bevel gear are respectively meshed with the driving bevel gear. Multiple second stirring blades are installed on the side wall of the turntable.
[0011] Preferably, a bevel gear disk is fixedly connected to one end of the annular groove close to the turntable. A plurality of through grooves are formed in the turntable. One end of the second stirring blade is fixedly connected to an adjusting shaft rotatably connected to the inner wall of the turntable. One end of the adjusting shaft is fixedly connected to a third bevel gear meshed with the bevel gear disk.
[0012] The beneficial effects of the present invention are as follows: The two baffles provided in the mixing chamber guide the flow directions of the fire extinguishing liquid and air, causing them to collide with each other, thereby breaking the original large air bubble structure formed by the gas and crushing it into small air bubbles. At the same time, the clusters formed in the fire extinguishing liquid are broken and dispersed, so as to increase the contact area between air and liquid, strengthen the mixing effect, ensure the subsequent foaming quality, and the stirring blades rotating in opposite directions in adjacent directions further improve the mixing effect between the fire extinguishing liquid and gas, and further ensure the quality of subsequent foaming. In addition, the provided bevel gear disk cooperates with the third bevel gear to drive the second stirring blade to rotate self - sufficiently, generating relative movement between its surface and the surrounding fluid, forming a strong shear force, which helps to break the macromolecules in the liquid and the large air bubbles in the gas, thereby strengthening the mixing and further improving the quality of subsequent foaming. Description of the Drawings
[0013] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for the embodiments. It should be understood that the following drawings only show some embodiments of the present invention, so they should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings.
[0014] Figure 1 FIG. 1 is a front - view structural schematic diagram of a compressed air foam fire - extinguishing device provided by an embodiment of the present invention; Figure 2 FIG. 2 is a back - view structural schematic diagram of a compressed air foam fire - extinguishing device provided by an embodiment of the present invention; Figure 3 FIG. 3 is a half - sectional view of the back - view structure of a compressed air foam fire - extinguishing device provided by an embodiment of the present invention; Figure 4 FIG. 4 is a sectional view of the bottom structure of a compressed air foam fire - extinguishing device provided by an embodiment of the present invention; Figure 5 FIG. 5 is a structural schematic diagram of a mixing chamber in a compressed air foam fire - extinguishing device provided by an embodiment of the present invention; Figure 6 FIG. 6 is a sectional view of the structure of a mixing chamber in a compressed air foam fire - extinguishing device provided by an embodiment of the present invention; Figure 7It is a side cross-sectional view of the mixing chamber structure in a compressed air foam fire extinguishing device provided by an embodiment of the present invention; Figure 8 It is a schematic structural diagram of a mixing component in a compressed air foam fire extinguishing device provided by an embodiment of the present invention; Figure 9 It is a schematic side structural diagram of a mixing component in a compressed air foam fire extinguishing device provided by an embodiment of the present invention; Figure 10 It is a compressed air foam fire extinguishing device provided by an embodiment of the present invention Figure 9 Enlarged view of the structure of area A; Figure 11 It is a half-sectional view of a mixing component in a compressed air foam fire extinguishing device provided by an embodiment of the present invention; Figure 12 It is a compressed air foam fire extinguishing device provided by an embodiment of the present invention Figure 11 Enlarged view of the structure of area B; Figure 13 It is a side cross-sectional view of a mixing component in a compressed air foam fire extinguishing device provided by an embodiment of the present invention; Figure 14 It is a compressed air foam fire extinguishing device provided by an embodiment of the present invention Figure 13 Enlarged view of the structure of area C.
[0015] In the figure: 1. Fire extinguishing box; 11. Air storage tank; 12. Pressure relief valve; 13. Air pipe; 14. Liquid storage chamber; 15. Installation groove; 16. Diaphragm pump; 161. Liquid inlet pipe; 162. Liquid outlet pipe; 17. Spray pipe; 171. Spray gun; 18. Foaming pipe; 2. Mixing chamber; 21. Liquid inlet; 22. Liquid outlet; 23. Air inlet; 24. First baffle; 241. First notch; 25. Second baffle; 251. Second notch; 26. Third baffle; 27. Impeller; 3. Mixing component; 31. Rotating shaft; 311. Ring groove; 32. Fixed shaft; 321. First driven bevel gear; 33. First stirring blade; 34. Turntable; 341. Through groove; 35. Second driven bevel gear; 36. Second stirring blade; 361. Adjusting shaft; 362. Third bevel gear; 37. Bevel gear disc; 4. Fixed rod; 41. Installation rod; 42. Driving bevel gear. Specific embodiments
[0016] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.
[0017] Example, referring to Figures 1 - 14 , a compressed air foam fire extinguishing device, comprising a fire extinguishing box 1 and a mixing chamber 2 provided in the fire extinguishing box 1. A gas storage tank 11 is installed on one side of the fire extinguishing box 1. A pressure relief valve 12 is installed at one end of the gas storage tank 11. A trachea 13 is installed at one end of the pressure relief valve 12. A liquid storage chamber 14 and an installation groove 15 are respectively formed inside the fire extinguishing box 1. A diaphragm pump 16 is installed on the inner wall of the installation groove 15. A liquid inlet pipe 161 and a liquid outlet pipe 162 are respectively installed on the diaphragm pump 16. A foam generating pipe 18 is installed on the inner wall of the installation groove 15. A spray pipe 17 is installed at one end of the foam generating pipe 18. A spray gun 171 is installed at one end of the spray pipe 17; The mixing chamber 2 is fixedly arranged in the installation groove 15. A liquid inlet 21, a liquid outlet 22, and an air inlet 23 are respectively formed on multiple side walls of the mixing chamber 2. One end of the liquid inlet 21 is fixedly connected to one end of the liquid outlet pipe 162. One end of the liquid outlet 22 is fixedly connected to one end of the foam generating pipe 18. One end of the air inlet 23 is fixedly connected to one end of the trachea 13. A first baffle 24, a second baffle 25, and a third baffle 26 are respectively installed on the inner wall of the mixing chamber 2. An impeller 27 is installed on the inner wall of one end of the first baffle 24. A mixing assembly 3 is installed at the end of the first baffle 24 away from the impeller 27. A fixing rod 4 is installed on the outer wall of the first baffle 24 close to the mixing assembly 3. Multiple mounting rods 41 are installed on the upper outer wall of the fixing rod 4. A driving bevel gear 42 is installed on the inner wall of the upper end of each mounting rod 41; The mixing assembly 3 includes a rotating shaft 31, a first stirring blade 33, a turntable 34, and a second stirring blade 36.
[0018] Furthermore, the interior of the gas storage tank 11 is filled with high-pressure air. The foaming pipe 18 and the spray pipe 17 are fixedly connected in a sealed manner. The interior of the liquid storage cavity 14 is filled with fire extinguishing liquid. An inlet for adding fire extinguishing liquid is installed on the upper inner wall of the fire extinguishing box 1. A first notch 241 is provided at one end of the first baffle 24, and a second notch 251 is provided at one end of the second baffle 25. A gap is left between the bottom end of the third baffle 26 and the bottom end of the mixing chamber 2. Both ends of the impeller 27 are rotatably connected to the inner wall of the first baffle 24 and the mixing chamber 2 respectively. The blades on the impeller 27 are aligned with the air inlet 23 on one side. One end of the fixing rod 4 is fixedly connected to the side wall of the first baffle 24. One end of the mounting rod 41 is fixedly connected to the side wall of the fixing rod 4. One end side wall of the driving bevel gear 42 is rotatably connected to the inner wall of the mounting rod 41. The rotating shaft 31 is coaxially and fixedly connected to the shaft body at one end of the impeller 27. Both ends of the rotating shaft 31 are rotatably connected to the inner walls on one side of the first baffle 24 and the mixing chamber 2 respectively. A group of multiple first stirring blades 33 are fixedly installed around the side wall of the rotating shaft 31 in a circumferential manner. Multiple groups of first stirring blades 33 are equidistantly distributed on the side wall of the rotating shaft 31. A plurality of annular grooves 311 are equidistantly provided on the side wall of the rotating shaft 31. A fixing shaft 32 is fixedly connected to the inner wall of the annular groove 311. A first driven bevel gear 321 is fixedly connected to one end side wall of the fixing shaft 32. A turntable 34 is rotatably connected to the side wall of the fixing shaft 32 away from the first driven bevel gear 321. A second driven bevel gear 35 rotatably connected to the outer wall of the fixing shaft 32 is fixedly connected to one end of the turntable 34. The first driven bevel gear 321 and the second driven bevel gear 35 are respectively meshed with the driving bevel gear 42. A plurality of second stirring blades 36 are installed on the side wall of the turntable 34.
[0019] It should be noted that during fire extinguishing, the pressure relief valve 12 is opened to allow the high-pressure air inside the gas storage tank 11 to flow into the mixing chamber 2 through the air pipe 13. At the same time, the diaphragm pump 16 is opened to pump out the fire extinguishing liquid in the liquid storage cavity 14 through the liquid inlet pipe 161 and simultaneously enter the mixing chamber 2 through the liquid outlet pipe 162. When the high-pressure air entering the mixing chamber 2 passes through the impeller 27, it blows the blades of the impeller 27, causing it to rotate, and then flows through the first notch 241 on one side of the first baffle 24 to the other side of the mixing chamber 2. At the same time, the fire extinguishing liquid entering the mixing chamber 2 moves toward the side close to the first baffle 24 under the guidance of the second baffle 25. During the flow of the two, they collide with each other, thereby breaking the original large air bubble structure formed by the gas, crushing it into small air bubbles, and at the same time breaking and dispersing the clusters formed in the fire extinguishing liquid, so as to increase the contact area between the air and the liquid and enhance the mixing effect. At the same time, the turbulence and convection effects generated by the mutual impact of the two can accelerate the diffusion speed of air molecules in the liquid, thereby accelerating the diffusion process of air and further improving the mixing effect, ensuring the subsequent foaming quality. After the air and the fire extinguishing liquid collide with each other, they fall into the space below the second baffle 25 near the mixing chamber 2. At this time, the rotating shaft 31 rotates simultaneously under the action of the impeller 27, causing the first stirring blade 33 on its outer side to rotate, stirring the internal fire extinguishing liquid and air, and realizing the stirring and mixing of the two. While the rotating shaft 31 rotates, the first driven bevel gear 321 fixed to the outer side of the fixed shaft 32 on the inner wall of the annular groove 311 rotates and meshes with the driving bevel gear 42 on one side to rotate. The driving bevel gear 42 then meshes with the second driven bevel gear 35 on the other side to rotate, driving the turntable 34 at one end and the second stirring blade 36 on its outer side to rotate in the opposite direction to the first stirring blade 33, thereby realizing different rotation directions between adjacent stirring blades, generating a more complex flow pattern, enabling the surrounding fire extinguishing liquid and air to be subjected to forces in multiple directions, and at the same time generating shear force and tensile force in the area between them, breaking the macromolecules in the liquid and the large air bubbles in the air, thereby further improving the mixing effect between the fire extinguishing liquid and the gas and further ensuring the quality of subsequent foaming; After that, the mixed fire extinguishing liquid enters the other side through the gap between the third baffle 26 and the mixing chamber 2, then enters the foaming tube 18 at one end through the liquid outlet 22 for foaming, and then is ejected through the spray pipe 17 and the spray gun 171 for fire extinguishing operations.
[0020] Furthermore; one end of the annular groove 311 close to the turntable 34 is fixedly connected with a bevel gear disc 37. A plurality of through grooves 341 are formed on the turntable 34. One end of the second stirring blade 36 is fixedly connected with an adjusting shaft 361 rotatably connected to the inner wall of the turntable 34. One end of the adjusting shaft 361 is fixedly connected with a third bevel gear 362 meshing with the bevel gear disc 37.
[0021] It should be noted that: while the second stirring blade 36 rotates around the rotating shaft 31, the bevel gear disc 37 provided at one end of the annular groove 311 continuously meshes with the third bevel gear 362 on one side during the rotation following the rotating shaft 31, causing the third bevel gear 362 to drive the upper adjusting shaft 361 and the second stirring blade 36 to rotate self - rotatably, thereby generating relative motion between its surface and the surrounding fluid, forming a strong shear force, which helps to break the macromolecules in the liquid and the large air bubbles in the gas, and further strengthen the mixing, and further improve the quality of subsequent foaming.
[0022] The working principle of this compressed air foam fire extinguishing device: When extinguishing a fire, the pressure relief valve 12 is opened to allow the high-pressure air inside the gas storage tank 11 to flow into the mixing chamber 2 through the air pipe 13. At the same time, the diaphragm pump 16 is opened to extract the fire extinguishing liquid in the liquid storage chamber 14 through the liquid inlet pipe 161 and enter the mixing chamber 2 through the liquid outlet pipe 162 for preliminary mixing. After that, the mixed fire extinguishing liquid enters the other side through the gap between the third baffle 26 and the mixing chamber 2, and then enters the foaming pipe 18 at one end through the liquid outlet 22 for foaming. After that, it is ejected through the spray pipe 17 and the spray gun 171 to perform the fire extinguishing operation.
[0023] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.
Claims
1. A compressed air foam fire extinguishing device, comprising a fire extinguishing box (1) and a mixing chamber (2) arranged in the fire extinguishing box (1), characterized in that: A gas storage tank (11) is installed on one side of the fire extinguisher box (1), a pressure relief valve (12) is installed on one end of the gas storage tank (11), and a gas pipe (13) is installed on one end of the pressure relief valve (12). A liquid storage cavity (14) and a mounting groove (15) are respectively provided inside the fire extinguisher box (1), a diaphragm pump (16) is installed on the inner wall of the mounting groove (15), and a liquid inlet pipe (161) and a liquid outlet pipe (162) are respectively installed on the diaphragm pump (16), a foaming pipe (18) is installed on the inner wall of the mounting groove (15), a nozzle (17) is installed on one end of the foaming pipe (18), and a spray gun (171) is installed on one end of the nozzle (17); The mixing chamber (2) is fixedly arranged in the mounting groove (15); a plurality of side walls of the mixing chamber (2) are respectively provided with a liquid inlet (21), a liquid outlet (22) and an air inlet (23); the liquid inlet (21) is fixedly connected to one end of the liquid outlet pipe (162); the liquid outlet (22) is fixedly connected to one end of the foaming pipe (18); the air inlet (23) is fixedly connected to one end of the air pipe (13); and the inner wall of the mixing chamber (2) is respectively provided with a first baffle (24), a second baffle (25), a second baffle (26), and a second baffle (27). a second baffle (25) and a third baffle (26), an impeller (27) being mounted on an inner wall at one end of the first baffle (24), a mixing assembly (3) being mounted on an end of the first baffle (24) away from the impeller (27), a fixing rod (4) being mounted on an outer wall at a side of the first baffle (24) close to the mixing assembly (3), a plurality of mounting rods (41) being mounted on an upper outer wall of the fixing rod (4), and a driving bevel gear (42) being mounted on an inner wall at an upper end of each mounting rod (41); The mixing assembly (3) comprises a rotating shaft (31), a first stirring blade (33), a rotating disk (34) and a second stirring blade (36).
2. A compressed air foam fire extinguishing device according to claim 1, characterized in that: The interior of the gas storage tank (11) is filled with high-pressure air, the foaming tube (18) and the nozzle (17) are sealed and fixedly connected, the interior of the liquid storage chamber (14) is filled with fire extinguishing liquid, and an inlet for adding fire extinguishing liquid is installed on the inner wall of the upper end of the fire extinguishing box (1).
3. A compressed air foam fire extinguishing device according to claim 2, characterized in that: A first notch (241) is formed at one end of the first baffle plate (24), a second notch (251) is formed at one end of the second baffle plate (25), and a gap is left between the bottom end of the third baffle plate (26) and the bottom end of the mixing chamber (2).
4. A compressed air foam fire extinguishing device according to claim 3, characterized in that: The two ends of the impeller (27) are rotatably connected to the first baffle (24) and the inner wall of the mixing chamber (2), respectively; the blades on the impeller (27) are aligned with the air inlet (23) on one side; one end of the fixing rod (4) is fixedly connected to the side wall of the first baffle (24); one end of the mounting rod (41) is fixedly connected to the side wall of the fixing rod (4); and one end of the side wall of the driving bevel gear (42) is rotatably connected to the inner wall of the mounting rod (41).
5. A compressed air foam fire extinguishing device according to claim 4, characterized in that: The rotating shaft (31) and one end of the impeller (27) are coaxially fixed, and the two ends of the rotating shaft (31) are rotatably connected to the first baffle (24) and the inner wall of one side of the mixing chamber (2) respectively. The plurality of first stirring blades (33) are a group of first stirring blades (33) fixedly mounted around the side wall of the rotating shaft (31), and the plurality of groups of first stirring blades (33) are equidistantly distributed on the side wall of the rotating shaft (31).
6. A compressed air foam fire extinguishing device according to claim 5, characterized in that: A plurality of annular grooves (311) are formed at equal intervals on the side wall of the rotating shaft (31); a fixed shaft (32) is fixedly connected to the inner wall of the annular groove (311); a first driven bevel gear (321) is fixedly connected to the side wall at one end of the fixed shaft (32); a rotating disk (34) is rotatably connected to the side wall at one end of the fixed shaft (32) away from the first driven bevel gear (321); a second driven bevel gear (35) rotatably connected to the outer wall of the fixed shaft (32) is fixedly connected to one end of the rotating disk (34); the first driven bevel gear (321) and the second driven bevel gear (35) are respectively meshed and connected to the driving bevel gear (42); and a plurality of second stirring blades (36) are mounted on the side wall of the rotating disk (34).
7. A compressed air foam fire extinguishing device according to claim 6, characterized in that: One end of the annular groove (311) close to the rotating disk (34) is fixedly connected to a bevel gear disk (37); a plurality of through slots (341) are provided on the rotating disk (34); one end of the second stirring blade (36) is fixedly connected to an adjustment shaft (361) rotatably connected to the inner wall of the rotating disk (34); and one end of the adjustment shaft (361) is fixedly connected to a third bevel gear (362) meshingly connected to the bevel gear disk (37).