CN103007472B - Compressed air foam extinguishing agent ejecting gun and method thereof - Google Patents
Compressed air foam extinguishing agent ejecting gun and method thereof Download PDFInfo
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- CN103007472B CN103007472B CN201210517766.8A CN201210517766A CN103007472B CN 103007472 B CN103007472 B CN 103007472B CN 201210517766 A CN201210517766 A CN 201210517766A CN 103007472 B CN103007472 B CN 103007472B
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Abstract
The invention discloses a kind of compressed air foam extinguishing agent ejecting gun and method thereof, fire foam liquid sprays from extinguishing chemical and penetrates being close to the annular spray passage of wall of gun barrel import department, form the liquid film of jet attached flow, the high velocity air that the convergent nozzle spraying gun barrel import department center at extinguishing chemical is injected impacts and under cutting, liquid-sheet disintegration, shrink under surface tension effects by cutting liquid film compressed air be wrapped in, generate numerous air foam pearl, fire foam liquid is made to become swiftly flowing compressed-air foam, this compressed-air foam is injection at a high speed after speedup again in " convergent-divergent channel " type gun barrel.Present invention achieves that compressed air and fire foam are mixed in rifle body generates compressed-air foam, and injection at a high speed, put out fuel fire and its resume combustion of prevention fast, put out the fire of same intensity, a large amount of fire foam can be saved.
Description
Technical field
The invention belongs to technical field of fire control, particularly a kind of compressed air foam extinguishing agent ejecting gun.
Background technology
Aqueous film-forming foam extinguishing agent (AFFF), be dispersed on pasta after injection from fire-fighting lance, formation floats over moisture film pasta being lighter than fuel oil (gasoline, diesel oil, aviation kerosine), make fuel oil and air exclusion and by fray-out of flame, therefore be referred to as again " aqueous film forming foam extinguishing chemical ".The very good effect that it is moisture film that multipurpose fire-fighting lance has aqueous film-forming foam extinguishing agent distribution.In view of its this good characteristic, naval of various countries put out a fire to save life and property naval vessels and ship-board aircraft fire time use multifunctional water gun, embedded extinguishing chemical nozzle spray aqueous film-forming foam extinguishing agent.But the moisture film after injection does not have adhesive ability, running off to lower under gravity, for putting out the fuel fire in leaking and trickling, the covering power keeping moisture film on pasta must be sprayed continuously.For this reason, U.S. army's aircraft-carrier flight deck is provided with hundreds of embedded extinguishing chemical nozzles and spray gun, to make on flight-deck in fire-fighting region the AFFF extinguishing chemical jet flow amount of every square metre of acquisition per minute 350 liters, for adapting to this demand of sustained firing, U.S. army's aircraft carrier is provided with in flight-deck position the fire station that 20 places stock AFFF extinguishing chemical, has stocked more than 50,000 altogether and has risen AFFF extinguishing chemical.
Active service foam truck is provided with " self-priming air foam nozzle (big gun) ".The use history of " self-priming air foam nozzle (big gun) " existing decades, it be by fire foam stoste and water in proportion mixed dilute after, with in 0.8 ~ 1.0 MPa input foam gun (big gun), low pressure is produced during caliber contraction place (i.e. the Venturi tube) of liquid stream in rifle (big gun), through passage outside air sucked in rifle (big gun) to mix with foam solution and generate air foam, penetrate from foam gun (big gun).Because the air mass flow entered in pipeline is little, a part of foam fire-fighting liquid can only be made to generate air foam, air foam after injection need could form air foam cover layer through trickling on fuel oil face, this air foam does not stick to the ability on wall, therefore, this type foam gun (big gun) fails to give full play to the performance of fire foam.Spray gun on cart type foam annihilator also belongs to this type.
In the last few years, China has introduced " compressed air-foam truck " from country of Europe, the United States, the compressed air that the screw air compressor that car loads produces, be the aqueous film-forming foam extinguishing agent (or class A foam extinguishing chemical) of 0.8 ~ 1.0 MPa with the pressure after diluting through water, input the ratio mixing in setting automatically in the flow proportional blender accurately controlled by microcomputer respectively, in foam maker, generate air foam again, penetrate from foam gun (big gun) high speed.When air mixes with higher volume ratio and aqueous film-forming foam extinguishing agent (or class A foam extinguishing chemical), can eject " dry foam " that lack mobility, " dry foam " is piled up and is covered on pasta, also can stick in vertical walls, water damage in fire attack is significantly reduced, and the fire-fighting efficiency of fuel fire of putting out a fire to save life and property is greatly improved.Fire foam and air also can mix by lower volume ratio, and the air foam after injection contains comparatively juicy, can trickle, and are suitable for category-A fire of putting out a fire to save life and property, comprise smoldering fire.This employing compressed air can mix according to different proportion the system generating air foam with fire foam, is called as " CAFS (being called for short CAFS) ".
But, on the fire foam spray gun being fixed on each regions such as naval vessels, boats and ships, aircraft at present and in extinguishing chemical conveyance conduit, and on cart type AFFF fire extinguisher spray gun, install additional by the proportioner of computer-controlled baroque compressed air and foam fire-fighting liquid and foam device, fixed froth installation and cart type foam annihilator structure bulky can be made and be difficult to realize.
Summary of the invention
The object of the present invention is to provide a kind of compressed air foam extinguishing agent ejecting gun and method thereof, compressed air is fully mixed in rifle body with aqueous film-forming foam extinguishing agent, and injection at a high speed, the frothing percentage of fire foam is high, adhesiveness is good, jet length is far away, can give full play to the extinguishing property of aqueous film-forming foam extinguishing agent.
The technical solution realizing the object of the invention is: a kind of compressed air foam extinguishing agent injection method, fire foam liquid sprays from extinguishing chemical and penetrates being close to the annular spray passage of wall of gun barrel import department, form the liquid film of jet attached flow, the high velocity air that the convergent nozzle spraying gun barrel import department center at extinguishing chemical is injected impacts and under cutting, liquid-sheet disintegration, shrink under surface tension effects by cutting liquid film compressed air be wrapped in, generate numerous air foam pearl, fire foam liquid is made to become swiftly flowing compressed-air foam, this compressed-air foam is injection at a high speed after speedup again in " convergent-divergent channel " type gun barrel.
A kind of compressed air foam extinguishing agent ejecting gun, comprise fire foam input adapter, the ball valve of the first belt driving gear, infusion pipeline, convergent nozzle, fastening nut, " convergent-divergent channel " type gun barrel, air delivering pipeline, housing, the ball valve of the second belt driving gear, inlet suction port, air delivering pipeline and infusion pipeline are arranged in housing, the entrance point of described air delivering pipeline is connected with inlet suction port by the ball valve of the second belt driving gear, the entrance point of convergent nozzle is connected at the port of export of air delivering pipeline, the outlet of convergent nozzle is arranged in the entrance point of " convergent-divergent channel " type gun barrel, inlet suction port, the ball valve of the second belt driving gear, air delivering pipeline, convergent nozzle, " convergent-divergent channel " type gun barrel is installed on the same axis, the compressed-air actuated injection channel of common composition, the entrance point of described infusion pipeline is connected with fire foam input adapter by the ball valve of the first belt driving gear, the port of export of infusion pipeline communicates with the entrance point of " convergent-divergent channel " type gun barrel, internal thread and " convergent-divergent channel " type gun barrel of the infusion pipeline port of export are spirally connected, and by the fastening nut on " convergent-divergent channel " type gun barrel external screw thread, " convergent-divergent channel " type gun barrel is tightened together with infusion pipeline, gap between the entrance point of " convergent-divergent channel " type gun barrel and the outlet of convergent nozzle forms the annular spray passage that " convergent-divergent channel " type gun barrel injected by fire foam, fire foam input adapter, the ball valve of belt driving gear, infusion pipeline, " convergent-divergent channel " type gun barrel forms the injection channel of fire foam jointly.
The present invention compared with prior art, its remarkable advantage: (1) achieves that compressed air and fire foam are mixed in rifle body generates compressed-air foam, and injection at a high speed, air foam covers on comburant, be piled into not flowable foam blanket, or adhere to and be deposited in the equipments such as aircraft on the surface, extinguish fast fuel fire and its resume combustion of prevention, put out the fire of same intensity, a large amount of fire foam can be saved.
(2) in rifle body, the generating apparatus structure of air foam is simple, the small volume and less weight of rifle body.
(3) compressed air film fire foam ejecting gun of the present invention is provided with the device of the injection flow of adjustable fire foam, can eject " dry foam " that foam completely, or " wet foam " that moisture content is high.
(4) compressed air film fire foam ejecting gun of the present invention adopts " convergent-divergent channel " type gun barrel to spray air foam, the air foam of generation is made to produce twice speedup in flow process in gun barrel, thereafter with the injection at a high speed of the muzzle velocity of 120 ~ 140 meter per seconds, the firing rate of air foam agent is high, jet length is far away.
(5) when the present invention is used as the ejecting gun on cart type foam annihilator, operating personnel's distance burning things which may cause a fire disaster is far away, without the need to dressing proximity suit, improves quick-reaction capability, can avoid the risk of flame burn and reduction detonation injury.
(6) compressed air film fire foam ejecting gun of the present invention adopts ball valve as the gauge tap of gas, liquid transfer pipeline, simplify the structure of rifle body, alleviate rifle body weight, the internal diameter of ball valve is identical with tubing internal diameter, can internal resistance be reduced, increase the jet velocity of air foam jet.
Below in conjunction with accompanying drawing, the present invention is described in further detail.
Accompanying drawing explanation
Fig. 1 is the general structure schematic diagram of compressed air foam extinguishing agent ejecting gun of the present invention.
Detailed description of the invention
Compressed air foam extinguishing agent injection method of the present invention, fire foam liquid sprays from extinguishing chemical and penetrates being close to the annular spray passage of wall of import department, form the liquid film of jet attached flow, the high velocity air that the convergent nozzle spraying gun barrel import department center at extinguishing chemical is injected impacts and under cutting, liquid-sheet disintegration, shrink under surface tension effects by cutting liquid film compressed air be wrapped in, generate numerous air foam pearl, foam fire-fighting liquid is made to become swiftly flowing compressed-air foam, this compressed-air foam is injection at a high speed after speedup again in " convergent-divergent channel " type gun barrel, namely input the annular spray channel setting of fire foam in the porch of extinguishing chemical ejecting gun (big gun), along the interior sidewall surface input fire foam of the convergent contour of extinguishing chemical ejecting gun (big gun) pipe, working fluid produces " wall attachment effect ", form the liquid film flowed along the interior sidewall surface of the convergent contour of extinguishing chemical ejecting gun (big gun) pipe.In the import department center of extinguishing chemical ejecting gun (big gun), compressed-air actuated convergent nozzle is installed, the high velocity air injected impacts, the liquid film cut on wall, make it to break, the liquid film broken shrinks under the effect of surface tension of liquid, in the compressed air of cutting liquid film is wrapped in, generate numerous air foam pearl, become swiftly flowing compressed air foam extinguishing agent.Compressed air foam extinguishing agent is injection at a high speed after speedup again in " convergent-divergent channel " type gun barrel.
Composition graphs 1, realize the ejecting gun of above-mentioned compressed air foam extinguishing agent injection method, comprise fire foam input adapter 1, the ball valve 2 of the first belt driving gear, infusion pipeline 4, convergent nozzle 5, fastening nut 6, " convergent-divergent channel " type gun barrel 7, air delivering pipeline 8, housing 10, the ball valve 11 of the second belt driving gear, inlet suction port 12, air delivering pipeline 8 and infusion pipeline 4 are arranged in housing 10, the entrance point of described air delivering pipeline 8 is connected with inlet suction port 12 by the ball valve 11 of the second belt driving gear, the entrance point of convergent nozzle 5 is connected at the port of export of air delivering pipeline 8, the outlet of convergent nozzle 5 is arranged in the entrance point of " convergent-divergent channel " type gun barrel 7, inlet suction port 12, the ball valve 11 of the second belt driving gear, air delivering pipeline 8, convergent nozzle 5, " convergent-divergent channel " type gun barrel 7 is installed on the same axis, the compressed-air actuated injection channel of common composition, the entrance point of described infusion pipeline 4 is connected with fire foam input adapter 1 by the ball valve 2 of the first belt driving gear, the port of export of infusion pipeline 4 communicates with the entrance point of " convergent-divergent channel " type gun barrel 7, internal thread and " convergent-divergent channel " type gun barrel 7 of infusion pipeline 4 port of export are spirally connected, and by the fastening nut 6 on " convergent-divergent channel " type gun barrel 7 external screw thread, " convergent-divergent channel " type gun barrel 7 is tightened together with infusion pipeline 4, gap between the entrance point of " convergent-divergent channel " type gun barrel 7 and the outlet of convergent nozzle 5 forms the annular spray passage that " convergent-divergent channel " type gun barrel 7 injected by fire foam, namely convergent nozzle 5 and the inlet end face of " convergent-divergent channel " type gun barrel 7 form the annular jet of fire foam, fire foam input adapter 1, the ball valve 2 of belt driving gear, infusion pipeline 4, " convergent-divergent channel " type gun barrel 7 forms the injection channel of fire foam jointly.
The pipeline of the infusion pipeline 4 of compressed air foam extinguishing agent ejecting gun of the present invention is bending in housing 10, namely between the center line of infusion pipeline 4 entrance point and the center line of this infusion pipeline 4 port of export in 80 ~ 90 °.The diameter of convergent nozzle 5 import department is identical with the internal diameter of air delivering pipeline 8, and the diameter in exit is 3 ~ 6 millimeters, and taper angle is 15 ° ~ 20 °, changes the convergent nozzle 5 of different inner diameters, can change compressed-air actuated injection flow.
The housing 10 of compressed air foam extinguishing agent ejecting gun of the present invention is also provided with the trigger 3 of belt driving gear, the gears meshing of the ball valve 11 of the gear of the trigger 3 of this travelling gear and the ball valve 2 of the first belt driving gear and the second belt driving gear, the trigger 3 of belt driving gear is connected with trigger reset tension spring 9 one end, the other end of trigger reset tension spring 9 connects on the housing 10, under the pulling force effect of trigger reset tension spring 9, the trigger 3 of rotating band travelling gear, makes the valve of the ball valve 2 of the first belt driving gear and the ball valve 11 of the second belt driving gear be in normally off.
In compressed air foam extinguishing agent ejecting gun of the present invention and method thereof, pressure is the Compressed Gas of 0.8 ~ 1.2 MPa, entered by inlet suction port 12 in the ball valve 11 and air delivering pipeline 8 being with biography second belt driving gear, flow into convergent nozzle 5 again, produce high-speed gas jet, inject in " convergent-divergent channel " type gun barrel 7; Pressure is the aqueous film-forming foam extinguishing agent after the dilution of 0.8 ~ 1.0 MPa by another road, in the ball valve 2 entering the first belt driving gear from fire foam input adapter 1 and infusion pipeline 4, the annular spray passage of the extinguishing fluid through forming between " convergent-divergent channel " type gun barrel 7 and convergent nozzle 5, flows in " convergent-divergent channel " type gun barrel 7 along wall.Under liquid " wall attachment effect " effect, extinguishing fluid forms liquid film on the internal face of " convergent-divergent channel " type gun barrel 7, liquid film is impacted cutting by the high velocity air that convergent nozzle 5 is injected and breaks, the liquid film broken shrinks under the effect of surface tension of liquid, in the compressed air of cutting liquid film is wrapped in, generate numerous air foam pearl, make foam fire-fighting liquid generate compressed-air foam.Compressed-air foam flows to Way out in " convergent-divergent channel " type gun barrel 7, " convergent-divergent channel " former is special jet pipe for the design of pure Compressed Gas single-phase flow, flow through when this jet pipe is injected in air produce supersonic speed gas jetting when being greater than 1.528 atmospheric Compressed Gas, containing a large amount of liquid in " solution-air " two-phase fluid of compressed air foam extinguishing agent, the characteristic that the present invention is directed to compressed air foam extinguishing agent is designed to is applicable to the injection of " solution-air " two-phase fluid, convergent contour passage is significantly lengthened, its length is made to occupy 70% of " convergent-divergent channel " type gun barrel 7 total length, the liquid being conducive to the fire foam inputted is generated compressed air foam extinguishing agent by high-speed gas cutting in jet attached flow in convergent contour passage, when compressed air foam extinguishing agent flows in convergent contour passage, because of pipeline section long-pending reduction, flow is constant, rate of flow of fluid is accelerated, the contracted channel lengthened is conducive to compressed air foam extinguishing agent and obtains abundant speedup, all the other Design of length of 30% are diffused passage, when fluid enters divergent contour passage, and expansion of compressed gas, volume increases, and makes fluid speedup again, penetrates thereafter from the outlet of ejecting gun, its firing rate reaches 120 ~ 140 meter per seconds, realizes air foam agent high rate of fire, sprays at a distance.
Compressed air foam extinguishing agent ejecting gun of the present invention, when extinguishing fluid injection flow is 0.5 ~ 2.0 Kilograms Per Second, the internal diameter of fire foam input adapter 1 and infusion pipeline 4 is 8 ~ 15 millimeters, the internal diameter of inlet suction port 12 and air delivering pipeline 8 is 6 ~ 12 millimeters, the diameter of convergent nozzle 5 import department is identical with the internal diameter of air delivering pipeline 8, the diameter in exit is 3 ~ 6 millimeters, and taper angle is 15 ° ~ 20 °.Change the convergent nozzle 5 of different outlet diameter, the compression gas flow injected in " convergent-divergent channel " type gun barrel 7 can be changed.The length of the present invention's " convergent-divergent channel " type gun barrel 7 is 250 ~ 350 millimeters, and the internal diameter of the import department of " convergent-divergent channel " type gun barrel 7 is 12 ~ 15 millimeters, and the internal diameter at trunnion place is 8 ~ 12 millimeters, and the internal diameter in exit is 12 ~ 18 millimeters." convergent-divergent channel " type gun barrel 7 of compressed air foam extinguishing agent ejecting gun of the present invention is installed on the housing 10, gap between " convergent-divergent channel " type gun barrel 7 and convergent nozzle 5 is 2 ~ 6 millimeters, change the gap of the passage formed between " convergent-divergent channel " type gun barrel 7 and convergent nozzle 5, the injection flow of fire foam can be changed.After convergent nozzle 5 is selected, solution-air volume flow ratio is changed by the method in the gap changing the passage formed between " convergent-divergent channel " type gun barrel 7 and convergent nozzle 5, its method is: unscrew fastening nut 6, the gap of the passage formed between adjustment " convergent-divergent channel " type gun barrel 7 and convergent nozzle 5.When gas, liquid volume flow ratio are at 20 ~ 30:1, can eject " dry foam " that foam completely; When gas, liquid volume flow ratio are 8 ~ 20:1, can eject " wet foam " that moisture content is high.The one-tenth bubble rate of " dry foam " is high, and fire foam covering performance is good, can stick in vertical walls, can increase substantially the fire-fighting efficiency of aqueous film-forming foam extinguishing agent.
Gas in compressed air foam extinguishing agent ejecting gun of the present invention, liquid input pressure are when within the scope of 0.8 ~ 1.0 MPa, both are unequal, the pressure in infusion pipeline 4 is less than because of the pressure in ejecting gun " convergent-divergent channel " type gun barrel 7, also be less than the pressure in air delivering pipeline 8 simultaneously, system is made to have stability, still can normal injection.
Compressed air foam extinguishing agent ejecting gun of the present invention, when the flow of the foam fire-fighting liquid penetrated is greater than 2.0 Kilograms Per Second, the reaction force that ejecting gun produces has been difficult to make fire fighter grip injection, now the present invention is used for vehicle-mounted compressed air foam extinguishing agent and sprays big gun, by the connecting and disconnecting of solenoid control infusion pipeline and air delivering pipeline, the flow of fire foam is 10 ~ 20 Kilograms Per Seconds, and the jet length of air foam reaches 30 ~ 45 meters.
Compressed air foam extinguishing agent ejecting gun of the present invention, can spray aqueous film-forming foam extinguishing agent, class A foam extinguishing chemical.As compressed air foam extinguishing agent ejecting gun input water of the present invention or other water-based extinguishing agent (such as F-500, Fa An get 2000 etc.) time, the high-speed jet of the ultra-fine droplet shape of this liquid extinguisher can be penetrated, compared with heavy pressure fine spray ejecting gun, under equal flow, the jet of the ultra-fine droplet shape of compressed air foam extinguishing agent ejecting gun injection of the present invention has farther jet length, has the larger kinetic energy penetrating flame.
Embodiment 1
Compressed air foam extinguishing agent ejecting gun of the present invention, time on cart type non-reservoir pressure AFFF fire extinguisher, on fire extinguisher tank, the flexible pipe of foam output extinguishing chemical is connected with the fire foam input adapter 1 of ejecting gun, and the output of high-pressure gas cartridge carries compressed-air actuated flexible pipe to be connected with inlet suction port 12 after pressure reducer decompression.Open the trigger 3 of belt driving gear, pressure-air from compressed gas cylinder reduces to after 0.8 ~ 1.0 MPa through pressure reducer, in the ball valve 11 that one route inlet suction port 12 enters belt driving gear and air delivering pipeline 8, when flowing through convergent nozzle 5, its firing rate improves, but the outlet diameter of convergent nozzle 5 is little, gas flow is restricted, and is 15 ~ 20 liters/second; In another road compressed air input foam annihilator tank, foam fire-fighting liquid is driven to enter in fire foam input adapter 1, foam fire-fighting liquid is when flowing through the gap of the injection channel formed between " convergent-divergent channel " type gun barrel 7 and convergent nozzle 5, the flow of fire foam is restricted, when the gap of injection channel is 2.5 millimeters, the flow of fire foam is 0.5 Kilograms Per Second, inject the AFFF extinguishing fluid in " convergent-divergent channel " type gun barrel 7 and Compressed Gas generation air foam agent injection at a high speed, jet length can reach 14 ~ 16 meters.Close the trigger 3 of belt driving gear, under the pulling force effect of trigger back-moving spring 9, the ball valve 2 of rotating band travelling gear and the ball valve 11 of belt driving gear rotate, the ball valve 2 of belt driving gear and the ball valve 11 of belt driving gear are closed, cut off the inlet passage of fire foam and Compressed Gas, stop spraying.
Embodiment 2
Compressed air foam extinguishing agent ejecting gun of the present invention, during hand-held extinguishing chemical ejecting gun as fire fighter, is the compressed air of 0.8 ~ 1.0 MPa from vehicle-mounted or carrier-borne air compressor machine supply pressure, in input inlet suction port 12; It is the aqueous film-forming foam extinguishing agent after the dilution of 0.8 ~ 1.0 MPa by pressure, in input fire foam joint 1, open the trigger 3 of belt driving gear, aqueous film-forming foam extinguishing agent after dilution flows through the gap of the injection channel formed between " convergent-divergent channel " type gun barrel 7 and convergent nozzle 5, when the gap of injection channel is 4.5 millimeters, about the flow of AFFF extinguishing fluid remains on 2.0 Kilograms Per Seconds; Convergent nozzle 5 makes compressed-air actuated flow remain on 60 ~ 70 liters/second, and the jet length of " dry foam " that eject from " convergent-divergent channel " type gun barrel 7 can reach 22 ~ 26 meters.
Claims (7)
1. a compressed air foam extinguishing agent ejecting gun, is characterized in that comprising fire foam input adapter (1), the ball valve (2) of the first belt driving gear, infusion pipeline (4), convergent nozzle (5), fastening nut (6), " convergent-divergent channel " type gun barrel (7), air delivering pipeline (8), housing (10), the ball valve (11) of the second belt driving gear, inlet suction port (12), air delivering pipeline (8) and infusion pipeline (4) are arranged in housing (10), the entrance point of described air delivering pipeline (8) is connected with inlet suction port (12) by the ball valve (11) of the second belt driving gear, the entrance point of convergent nozzle (5) is connected at the port of export of air delivering pipeline (8), the outlet of convergent nozzle (5) is arranged in the entrance point of " convergent-divergent channel " type gun barrel (7), inlet suction port (12), the ball valve (11) of the second belt driving gear, air delivering pipeline (8), convergent nozzle (5), " convergent-divergent channel " type gun barrel (7) is installed on the same axis, the compressed-air actuated injection channel of common composition, the entrance point of described infusion pipeline (4) is connected with fire foam input adapter (1) by the ball valve (2) of the first belt driving gear, the port of export of infusion pipeline (4) communicates with the entrance point of " convergent-divergent channel " type gun barrel (7), internal thread and " convergent-divergent channel " type gun barrel (7) of infusion pipeline (4) port of export are spirally connected, and by the fastening nut (6) on " convergent-divergent channel " type gun barrel (7) external screw thread, " convergent-divergent channel " type gun barrel (7) is tightened together with infusion pipeline (4), gap between the entrance point of " convergent-divergent channel " type gun barrel (7) and the outlet of convergent nozzle (5) forms the annular spray passage that " convergent-divergent channel " type gun barrel (7) injected by fire foam, fire foam input adapter (1), the ball valve (2) of belt driving gear, infusion pipeline (4), " convergent-divergent channel " type gun barrel (7) forms the injection channel of fire foam jointly,
Described housing (10) is also provided with the trigger (3) of belt driving gear, the gears meshing of the ball valve (11) of the gear of the trigger (3) of this travelling gear and the ball valve (2) of the first belt driving gear and the second belt driving gear, the trigger (3) of belt driving gear is connected with trigger reset tension spring (9) one end, the other end of trigger reset tension spring (9) is connected on housing (10), under the pulling force effect of trigger reset tension spring (9), the trigger (3) of rotating band travelling gear, the valve of the ball valve (11) of the ball valve of the first belt driving gear (2) and the second belt driving gear is made to be in normally off.
2. compressed air foam extinguishing agent ejecting gun according to claim 1, it is characterized in that the pipeline of infusion pipeline (4) is bending in housing (10), namely infusion pipeline (4) entrance point be 80 ~ 90 ° between center line and the center line of this infusion pipeline (4) port of export.
3. compressed air foam extinguishing agent ejecting gun according to claim 1, it is characterized in that the diameter of convergent nozzle (5) import department is identical with the internal diameter of air delivering pipeline (8), the internal diameter in exit is 3 ~ 6 millimeters, taper angle is 15 ° ~ 20 °, change the convergent nozzle (5) of different inner diameters, compressed-air actuated injection flow can be changed.
4. compressed air foam extinguishing agent ejecting gun according to claim 1, it is characterized in that " convergent-divergent channel " type gun barrel (7) is arranged on housing (10), gap between the outlet of convergent nozzle (5) and the inlet end face of " convergent-divergent channel " type gun barrel (7) is 2 ~ 6 millimeters, unscrew the path clearance formed between fastening nut (6) adjustment " convergent-divergent channel " type gun barrel (7) inlet end face and convergent nozzle (5), change the sectional area of annular jet, thus change the injection flow of fire foam.
5. compressed air foam extinguishing agent ejecting gun according to claim 4, is characterized in that, when gas, liquid volume flow ratio are at 20 ~ 30:1, can ejecting " dry foam " that foam completely; When gas, liquid volume flow ratio are less than 8 ~ 20:1, can eject " wet foam " that moisture content is high.
6. compressed air foam extinguishing agent ejecting gun according to claim 1, it is characterized in that under the extinguishing fluid injection flow of 0.5 ~ 2.0 Kilograms Per Second, the internal diameter of fire foam input adapter (1) and infusion pipeline (4) is 8 ~ 15 millimeters, and the internal diameter of inlet suction port (12) and air delivering pipeline (8) is 6 ~ 12 millimeters; The length of " convergent-divergent channel " type gun barrel (7) is 250 ~ 350 millimeters, and the internal diameter of the import department of " convergent-divergent channel " type gun barrel (7) is 12 ~ 15 millimeters, and the internal diameter at trunnion place is 8 ~ 12 millimeters, and the internal diameter in exit is 12 ~ 18 millimeters.
7. compressed air foam extinguishing agent ejecting gun according to claim 1, it is characterized in that the extinguishing chemical inputted in fire foam input adapter (1) is aqueous film-forming foam extinguishing agent or class A foam extinguishing chemical, when input water or water-based extinguishing agent, the high-speed jet of ultra-fine droplet can be ejected.
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| CN201210517766.8A CN103007472B (en) | 2012-12-05 | 2012-12-05 | Compressed air foam extinguishing agent ejecting gun and method thereof |
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| CN201210517766.8A CN103007472B (en) | 2012-12-05 | 2012-12-05 | Compressed air foam extinguishing agent ejecting gun and method thereof |
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