Gas-driven fire extinguishing bomb and method of use thereof

Abstract

The present invention relates to a gas-driven fire extinguishing bomb and its use method, belonging to the technical field of firefighting equipment. The bomb comprises a shell, the top of which is connected to a first baffle, the top of which is connected to a bomb top, the outer wall of which is provided with longitudinal grooves, transverse grooves, a belt groove, and four tail grooves, wherein a belt is placed in the belt groove, and an open tail is located in the tail groove. The bottom of the shell is connected to a bomb base, a high-pressure gas chamber cavity is connected to the bottom surface of the first baffle, a high-pressure gas chamber is formed between the first baffle and the high-pressure gas chamber cavity, a valve core is connected to the middle portion of the first baffle, an inflation solenoid valve is connected to the middle portion of the bottom surface of the high-pressure gas chamber cavity, an air outlet of an inflation pipe is connected to a high-pressure air bag, the shell is connected to a second baffle, the inflation pipe is connected to the middle portion of the second baffle, and a dry powder fire extinguishing agent is filled between the second baffle and the shell. The present invention has low safety risks, more rapid and uniform dispensing of dry powder fire extinguishing agent, convenient inspection and maintenance, and more stable flight process.

Description

Technical Field

[0001] The present invention relates to the technical field of fire-fighting equipment, and in particular to a gas-driven fire-extinguishing bomb and a method of using the same. Background Art

[0002] In order to speed up or facilitate fire extinguishing, fire extinguishing bombs are used in some scenarios, such as forest fire fighting. The fire extinguishing principle of fire extinguishing bombs is: the fire extinguishing agent inside the fire extinguishing bomb is released into the fire scene under the action of driving force. Existing fire extinguishing bombs have the following problems:

[0003] (1) The fire extinguishing agent is mostly driven by gunpowder. The design and manufacture of gunpowder-driven fire extinguishing bombs need to consider safety and reliability because they use dangerous gunpowder. They are also dangerous in storage and use.

[0004] (2) Even the existing gas-driven fire extinguishing bombs use a method of dispersing fire extinguishing agents: using the gas stored in the high-pressure gas chamber of the fire extinguishing bomb body to drive the piston to move, the piston pushes the fire extinguishing agent forward, and the fire extinguishing agent is released from the head of the fire extinguishing bomb to achieve the dispersion of the fire extinguishing agent. This method of using the piston to disperse the fire extinguishing agent has a certain distance from the head of the fire extinguishing bomb to the piston. During the pushing process, the cavity between the gas chamber and the piston gradually increases, causing the gas-driven piston pressure to gradually decrease. The friction between the piston and the shell will slow down the piston movement speed, resulting in the entire fire extinguishing agent dispersion process taking a long time, the fire extinguishing agent dispersion speed is slow, and the fire extinguishing agent is greatly affected by the environment during dispersion, making it impossible to quickly extinguish the fire.

[0005] (3) Since the fire extinguishing agent needs to be scattered by opening the head, the overall mechanical structure of the fire extinguishing bomb is more complicated, the mass of the fire extinguishing bomb is large, the flight distance is limited, and it is not convenient for the maintenance and inspection of the fire extinguishing bomb. Summary of the Invention

[0006] To solve the above technical problems, the present invention provides a gas-driven fire extinguishing bomb and a method for using the same. The technical solution of the present invention is as follows:

[0007] The present invention provides a gas-driven fire extinguishing bomb, which includes a shell, a first baffle connected to the top of the shell, a bomb top connected to the top of the first baffle, a plurality of mutually parallel longitudinal grooves, a plurality of mutually parallel transverse grooves, a belt groove and four tail grooves are provided on the outer wall of the shell, the belt groove and the four tail grooves are located at the bottom of the shell, the four tail grooves are evenly distributed along the circumference of the bottom of the shell, an elastic belt is placed in the belt groove, the inner diameter of the belt matches the outer diameter of the belt groove, a first protrusion is connected to the position where the tail groove is located on the shell, an open tail is located in the tail groove, and an open tail is opened. The tail fin includes a tail fin base and a wing, a first protrusion is connected to a rotating shaft, the first protrusion is also connected to the tail fin base, the wing is rotatably connected to the rotating shaft, the top of the wing is higher than the elastic belt so that the wing is limited by the elastic belt, the tail fin base is L-shaped, the side of the vertical part and the top surface of the horizontal part of the tail fin base are connected to connecting rods, the two connecting rods are connected to the side of the horizontal part of the tail fin base, a buckle is connected to the bottom end of the wing with a slot, the buckle can be snapped into the slot, a position sensor is connected to one side of the top of the first baffle, a fire extinguishing drive device is connected inside the shell, and the bottom end of the shell is connected to the shell base;

[0008] and a tube connecting the discharging opening of the gasket and the control cabinet. The gas connecting the discharging opening of the gasket and the control cabinet is used to connect the gasket to the control cabinet. The gasket is connected with the control cabinet. The gasket is connected with the control cabinet. The gasket is connected with the control cabinet.

[0009] Optionally, the spring top is a truncated cone structure.

[0010] Optionally, the longitudinal groove and the transverse groove are both V-shaped grooves.

[0011] Optionally, the materials of the missile base and the flared tail fin are both aluminum alloy.

[0012] Optionally, the rotating shaft includes an inner ring and an outer ring, the first protrusion is connected to the inner ring of the rotating shaft, the outer ring of the rotating shaft is provided with a groove, the tail base is connected to a second protrusion, and the second protrusion is stuck in the groove.

[0013] Optionally, the materials of the bullet top, the first baffle, the bullet shell and the second baffle are all ABS plastic, and the material of the bullet belt is plastic.

[0014] Optionally, a sealing ring is connected between the second baffle and the cartridge case.

[0015] Optionally, a flange is connected to the edge of the top surface of the second baffle.

[0016] The present invention also provides a method for using a gas-driven fire extinguishing bomb, which uses the above-mentioned gas-driven fire extinguishing bomb, comprising:

[0017] S1, using an air compressor to fill the high-pressure air chamber with gas through the valve core in advance, the air pressure sensor detects the air pressure of the high-pressure air chamber in real time and sends the air pressure data to the controller, and when the controller determines that the air pressure of the high-pressure air chamber reaches the preset pressure based on the air pressure data, it stops filling the high-pressure air chamber;

[0018] S2, when the gas-driven fire extinguishing bomb is in the barrel movement stage of the projectile launcher, the fins of the open tail fin are connected to the tail fin grooves through the rotating shaft, and the fins are constrained by the ammunition belt;

[0019] S3, when the gas-driven fire extinguishing device ejects from the muzzle of the projectile launcher, the band expands, creating a gap between the band and the band groove. The propellant gas in the gap suddenly expands, instantly destroying the band. The band flies away from the shell under the pressure of the propellant gas. When the band flies away, the restraint on the open tail fin is released. Under the action of the tension spring, the fin rotates with the shaft. When the slot rotates to the position of the buckle, the slot and the buckle cooperate to fix the open tail fin.

[0020] S4, the position sensor monitors the position of the gas-driven fire extinguishing bomb in real time and sends the position data to the controller. When the controller determines that the gas-driven fire extinguishing bomb has reached the specified position based on the position data, the controller controls the inflation solenoid valve to open, and the gas in the high-pressure gas chamber is filled into the high-pressure airbag. The high-pressure airbag expands and quickly squeezes the dry powder fire extinguishing agent, driving the shell to rupture, and the dry powder fire extinguishing agent is thrown outward and falls to the location where the fire needs to be extinguished.

[0021] All the above optional technical solutions can be combined arbitrarily, and the present invention does not provide detailed descriptions of the structures after each combination.

[0022] By means of the above solution, the beneficial effects of the present invention are as follows:

[0023] By providing a valve core, a high-pressure air chamber, an inflatable electromagnetic valve, and a high-pressure airbag, and by allowing the high-pressure gas in the high-pressure air chamber to fill the high-pressure airbag, the high-pressure airbag expands to drive the shell to rupture and achieve the dispersion of the dry powder fire extinguishing agent. The gas-driven fire extinguishing bomb provided by the present invention not only reduces the safety risks of the gas-driven fire extinguishing bomb during production, transportation, storage, and use, but also accelerates the dispersion process of the fire extinguishing agent, thereby increasing the effective fire extinguishing range and dispersion uniformity of the fire extinguishing agent. In addition, the use of the high-pressure airbag expansion and shell rupture method not only makes the dispersion of the dry powder fire extinguishing agent faster and more uniform, thereby improving the fire extinguishing efficiency, but also effectively reduces the overall mass of the gas-driven fire extinguishing bomb, increases the flight distance of the gas-driven fire extinguishing bomb, and also makes the inspection and maintenance of the gas-driven fire extinguishing bomb more convenient.

[0024] By providing longitudinal and transverse grooves on the outer wall of the shell, the shell can explode and rupture along the longitudinal and transverse grooves when subjected to the shock wave of the gunpowder. This allows the size and shape of the shell fragments to be controlled, allowing the dry powder fire extinguishing agent inside to be more evenly and fully dispersed, thereby improving the fire extinguishing efficiency of the gas-driven fire extinguishing bomb. At the same time, the controllability of the shell fragments of the gas-driven fire extinguishing bomb is enhanced, reducing the risk of shell fragments causing damage to the environment and personnel around the fire scene, making the gas-driven fire extinguishing bomb operation process safer. By providing an open tail fin, the stability of the gas-driven fire extinguishing bomb during flight is improved, allowing it to accurately reach the fire scene and carry out firefighting work at a long distance, quickly and effectively achieving the goal of controlling the fire, thereby reducing the casualties in the fire.

[0025] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention and implement it according to the contents of the specification, the following is a detailed description of the preferred embodiments of the present invention with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a structural schematic diagram of the gas-driven fire extinguishing bomb provided by the present invention.

[0027] Figure 2 It is a cross-sectional view of the gas-driven fire extinguishing bomb provided by the present invention.

[0028] Figure 3 The figure is a schematic diagram showing the connection relationship between the open tail fin and its surrounding components in the gas-driven fire extinguishing bomb provided by the present invention.

[0029] Figure 4 yes Figure 1 A partial enlarged view of point A in the middle.

[0030] Figure 5 yes Figure 2 A partial enlarged view of point B in the middle.

[0031] The accompanying drawings are marked as follows: 1-bullet top, 2-first baffle, 3-bullet case, 4-longitudinal groove, 5-transverse groove, 6-bullet belt, 7-bullet belt groove, 8-tail groove, 9-tail base, 10-bullet base, 11-wing, 12-rotating shaft, 13-buckle, 14-tension spring, 15-position sensor, 16-air pressure sensor, 17-sealing ring, 18-valve core, 19-high-pressure air chamber, 20-high-pressure air chamber cavity, 21-inflating electromagnetic valve, 22-second baffle, 23-inflating pipe, 24-dry powder fire extinguishing agent, 25-high-pressure airbag, 26-flange, 27-slot. DETAILED DESCRIPTION

[0032] The following embodiments of the present invention are described in further detail with reference to the accompanying drawings and examples. The following examples are used to illustrate the present invention but are not intended to limit the scope of the present invention.

[0033] like Figures 1 to 5 As shown, the gas-driven fire-extinguishing bomb provided by the embodiment of the present invention includes a shell 3, the top of the shell 3 is threadedly connected to the first baffle 2, the top of the first baffle 2 is threadedly connected to the bomb top 1, the outer wall of the shell 3 is provided with a plurality of mutually parallel longitudinal grooves 4, a plurality of mutually parallel transverse grooves 5, a band groove 7 and four tail grooves 8, the band groove 7 and the four tail grooves 8 are located at the bottom of the shell 3, the four tail grooves 8 are evenly distributed along the circumference of the bottom of the shell 3, an elastic band 6 is placed in the band groove 7, the inner diameter of the band 6 matches the outer diameter of the band groove 7, a first protrusion is connected to the position of the tail groove 8 on the shell 3, an open tail is located in the tail groove 8, and the open tail includes a tail base 9 and wing 11, the first protrusion is threadedly connected to the rotating shaft 12, the first protrusion is also threadedly connected to the tail base 9, the wing 11 is rotatably connected to the rotating shaft 12, the top of the wing 11 is higher than the elastic belt 6 so that the wing 11 is limited by the elastic belt 6, the tail base 9 is L-shaped, and the side surface of the vertical part and the top surface of the horizontal part of the tail base 9 are connected with connecting rods, and the two connecting rods are fixedly connected with a tension spring 14. The side surface of the horizontal part of the tail base 9 is connected with a buckle 13, and a slot 27 is provided at the bottom end of the wing 11. The buckle 13 can be inserted into the slot 27. A position sensor 15 is threadedly connected to one side of the top of the first baffle 2. The fire extinguishing drive device is connected to the inside of the cartridge case 3, and the bottom end of the cartridge case 3 is threadedly connected to the cartridge base 10;

[0034] The fire extinguishing drive device includes a high-pressure gas chamber cavity 20, which is threadedly connected to the bottom surface of the first baffle 2. A high-pressure gas chamber 19 is formed between the first baffle 2 and the high-pressure gas chamber cavity 20. The middle part of the first baffle 2 is threadedly connected to a valve core 18. The air inlet of the valve core 18 is used to connect to an external air compressor. The air outlet of the valve core 18 is connected to the high-pressure gas chamber 19. One side of the bottom surface of the first baffle 2 is threadedly connected to an air pressure sensor 16, and the air pressure sensor 16 is located in the high-pressure gas chamber 19. The middle part of the bottom surface of the high-pressure gas chamber cavity 20 is threadedly connected to an inflation electromagnetic valve 21. The air inlet of the inflation solenoid valve 21 is connected to the high-pressure air chamber 19, the air outlet of the inflation solenoid valve 21 is threadedly connected to the inflation pipe 23, and the air outlet of the inflation solenoid valve 21 is connected to the air inlet of the inflation pipe 23, the air outlet of the inflation pipe 23 is threadedly connected to the high-pressure airbag 25, the second baffle 22 is connected to the upper and middle part of the cartridge case 3, the inflation pipe 23 is threadedly connected to the middle part of the second baffle 22, and the space between the second baffle 22 and the cartridge case 3 is filled with dry powder fire extinguishing agent 24, the air pressure sensor 16, the inflation solenoid valve 21 and the position sensor 15 are all electrically connected to the controller.

[0035] The threaded connection can have a triangular thread profile and a right-handed rotation. The first baffle 2 serves to separate the cartridge case 3 from the cartridge top 1. The tension spring 14 is initially in an extended state. The valve core 18 is used to pre-inflate the high-pressure air chamber 19 via an air compressor. The air pressure sensor 16 monitors the air pressure within the high-pressure air chamber 19 during inflation to ensure that the air pressure within the high-pressure air chamber 19 is sufficient to drive the expansion of the high-pressure airbag 25 and compress the dry powder fire extinguishing agent 24 during use, rupturing the cartridge case 3. The controller can be a single-chip microcomputer, a programmable logic controller, or the like.

[0036] Matching the inner diameter of the elastic band 6 with the outer diameter of the elastic band groove 7 means that when not assembled, there is a gap between the inner diameter of the elastic band 6 and the outer diameter of the elastic band groove 7, providing space for the plastic elastic band 6 and the elastic band groove 7 to be assembled together. During assembly, heat shrinkage is used. The prestress generated by the shrinkage of the plastic elastic band 6 during heat shrinkage causes the elastic band 6 to cling to the elastic band groove 7, and at this point, there is no gap between the outer diameter of the elastic band groove 7 and the inner diameter of the elastic band 6.

[0037] In a specific embodiment, the bomb top 1 is a truncated cone structure to effectively reduce wind resistance.

[0038] In a specific embodiment, the longitudinal groove 4 and the transverse groove 5 are both V-shaped grooves.

[0039] In a specific embodiment, the base 10 and the flared tail fins are both made of aluminum alloy. The base 10 is made of aluminum alloy to enable the gas-driven fire extinguishing bomb to withstand higher launch pressure during launch, thereby increasing the launch distance of the gas-driven fire extinguishing bomb.

[0040] In one embodiment, the shaft 12 includes an inner ring and an outer ring. The first protrusion is connected to the inner ring of the shaft 12. The outer ring of the shaft 12 has a groove. A second protrusion is connected to the tail base 9 and is engaged in the groove. When the tension spring 14 is reset, it drives the wing 11 and the outer ring of the shaft 12 to rotate toward the position of the buckle 13.

[0041] In one embodiment, the bomb top 1, first baffle 2, shell 3, and second baffle 22 are all made of ABS plastic. This not only makes the gas-driven fire-extinguishing bomb relatively lightweight, but also provides excellent impact resistance, ensuring that the shell 3 does not break during flight. Furthermore, ABS is easy to process, allowing for the design and fabrication of a shell 3 that meets specific requirements. Compared to metal, ABS plastic is also relatively inexpensive, reducing the production cost of the gas-driven fire-extinguishing bomb. The band 6 is also made of plastic.

[0042] In a specific embodiment, a sealing ring 17 is connected between the second baffle 22 and the cartridge case 3 to ensure the sealing between the second baffle 22 and the cartridge case 3 and prevent the dry powder fire extinguishing agent 24 from jumping into the upper part of the second baffle 22.

[0043] In a specific embodiment, a flange 26 is connected to the edge of the top surface of the second baffle 22 to facilitate threaded connection between the second baffle 22 and the cartridge case 3 .

[0044] Furthermore, in order to ensure that the gas-driven fire extinguishing bomb can meet the strength requirements during launch and action, the embodiment of the present invention also specifically designs the wall thickness of the shell 3, the base 10 and the top 1, the open tail fins, the longitudinal grooves 4 and the transverse grooves 5, as shown below.

[0045] 1. Thickness of cartridge case 3:

[0046] First, the charge pressure caused by the axial inertial force when the gas-driven fire extinguishing bomb is launched is calculated using formula (1):

[0047]

[0048] In formula (1), P c Indicates the filling pressure when the gas-driven fire extinguishing bomb is launched; μ c is the Poisson coefficient of the pressurized dry powder fire extinguishing agent 24; d is the diameter of the cartridge case 3; r an is the inner diameter of the cartridge case 3, m wn is the mass of the filling material at the upper part of the cross section (the mass of the internal components of the shell 3), m is the total mass of the gas-driven fire extinguishing bomb; P represents the launch pressure of the gas-driven fire extinguishing bomb, which is related to the launch pressure at the bottom of the shell launching device.

[0049] 2) For the shell 3 rupture model, according to the mass and momentum conservation conditions and the Mises yield criterion, the formula (2) for calculating the minimum wall thickness of the shell 3 is derived.

[0050]

[0051] In formula (2), δ is the minimum wall thickness of the shell 3, p2 is the bursting pressure of the shell 3; p′ is the atmospheric pressure; is the yield strength of the shell material; c is the outer radius of the shell 3; b is the inner radius of the shell 3.

[0052] 3) The bursting pressure of the shell 3 needs to be greater than the pressure of the filling material. In the embodiment of the present invention, the bursting pressure of the shell 3 is set to be equal to the pressure of the filling material (i.e., P c =p2) to find the minimum wall thickness of the cartridge case 3.

[0053] 2. Wall thickness of the bullet base 10 and bullet top 1:

[0054] Specifically, the thickness of the bullet base 10 and the bullet top 1 is calculated by formula (3):

[0055]

[0056] In formula (3), d is the diameter of the shell 3; p is the maximum pressure in the warhead; and [σ] is the allowable stress of the shell material.

[0057] p=p1+p2-p'(4)

[0058] In formula (4), p1 is the maximum pressure of the filling material on the side wall of the shell 3, and p1 = ρaλd, where ρ is the density of the filling material, a is the maximum acceleration of the gas-driven fire extinguishing bomb in the gun barrel, and λ is the gas-driven

[0059] The aspect ratio of the dynamic fire extinguishing bomb; p2 is the fuel vapor pressure (the fuel vapor pressure is constant at a certain temperature); p' is the atmospheric pressure.

[0060] 3. Open tail:

[0061] Specifically, the design of the flared fins should ensure that the fins do not open while in the chamber using the ammunition belt 6, but can open and quickly reach their proper positions after exiting the muzzle. The condition for the fins to not open before exiting the muzzle must satisfy formula (5):

[0062]

[0063] In formula (5), p3 is the pressure during the aftereffect period, p3 = p g e -αt , p gis the muzzle pressure, t represents the duration of the muzzle as the starting point, α is the empirical index, α=0.0263ln(p g / 0.101)V g / d,V g is the muzzle velocity of the gas-driven fire extinguishing bomb, d is the diameter of the shell 3; m is the total mass of the gas-driven fire extinguishing bomb; r e is the distance between the center of mass of the wing 11 and the missile axis; ω g is the rotation speed of the gas-driven fire extinguishing bomb at the muzzle; r cp x is the converted radius of the gun bore section when the rifling is taken into account (a constant, the specific value is the distance between the axis of the gas-driven fire extinguishing bomb and the rifling); e 、y e They are respectively the longitudinal and axial distances between the center of mass of the open tail and the rotation axis when the tail is in the folded state.

[0064] The stability reserve of the open tail wing also needs to be calculated. The formula for calculating the stability reserve of the open tail wing is formula (6):

[0065]

[0066] In formula (6), x p is the absolute distance from the resistance center of the gas-driven fire extinguishing bomb to the bomb top 1; x s C is the absolute distance from the center of mass of the gas-driven fire extinguishing bomb to the bomb top 1; p C is the relative distance from the resistance center of the gas-driven fire extinguishing bomb to the bomb top 1; s is the relative distance from the center of mass of the gas-driven fire extinguishing bomb to the bomb top 1; l is the total length of the gas-driven fire extinguishing bomb.

[0067] Among them, C p =(C pk ·C yk +C pw ·C yw ) / (C yk +C yw ), C yk is the lift coefficient of the gas-driven fire extinguishing bomb in the subsonic range C yk ≈δ1, δ1 is the projectile flight angle of attack. C pk is the lift coefficient of the gas-driven fire-extinguishing bomb, C in the subsonic stage pk ≈0.5. C pw is the pressure center coefficient of the open tail, C pw =(x w +0.5b cp ) / l,x w is the distance from the leading edge of the average aerodynamic chord length of the open tail to the top of the missile 1, b cp is the average chord length of the open tail. ywis the lift coefficient of the flared tail, λ w is the aspect ratio of the flared tail, λ w =2l w / b cp , l w is the wingspan, S w is the area of ​​the wing 11, S is the maximum cross-sectional area of ​​the gas-driven fire extinguishing bomb, Ma is the flight Mach number of the fire extinguishing bomb, Ma=v0 / a', v0 is the flight speed of the fire extinguishing bomb, and a' is the speed of sound.

[0068] In order to ensure the flight stability of the gas-driven fire-extinguishing bomb, B must be greater than 0. When a good open tail stabilizes the gas-driven fire-extinguishing bomb, its stable reserve must be at least 15% to 28%.

[0069] The embodiment of the present invention also calculates the resonant instability of the open tail wing, and the calculation formula is formula (7):

[0070]

[0071] In formula (7), n r is the actual rotation speed of the gas-driven fire extinguishing bomb, n ro is the resonant speed, χ is the rotational angular velocity ω of the gas-driven fire extinguishing bomb r Ratio to linear velocity v, k z is a constant related to the aerodynamic force of the gas-driven fire extinguishing bomb.

[0072] According to experience, in order to avoid resonance instability, the actual equilibrium speed η of the open tail should be at least L and resonant speed n ro The ratio η reaches η ≥ 1.4 ~ 4. The η value should not be too large, otherwise it will cause excessive dynamic unbalance torque and have an adverse effect on the density.

[0073] 4. Longitudinal groove 4 and transverse groove 5:

[0074] Specifically, the pressure p1″ of the shell 2 breaking after stress concentration is calculated using formula (8):

[0075] p1″=p1′ / K(8)

[0076] In formula (8), p1′ is the force on the inner wall of the cartridge case 3; K is the stress concentration factor. The stress concentration factors of the longitudinal groove 4 and the transverse groove 5 are calculated using finite element software.

[0077] Specifically, the stress concentration factor is related to the depth and width of the longitudinal groove 4 and the transverse groove 5. After the gas-driven fire extinguishing bomb is designed, the depth and width of the longitudinal groove 4 and the transverse groove 5 are determined according to the above formula.

[0078] Furthermore, the selection of the high-pressure airbag 25 in the embodiment of the present invention needs to be determined based on the shell bursting pressure required for the shell 3 to stably release the fire extinguishing agent. Different high-pressure airbags 25 are selected for different shell bursting pressures to ensure that the high-pressure airbag 25 can withstand a certain pressure without premature rupture. The embodiment of the present invention can obtain the final shell bursting pressure by conducting staged tests on the expansion shell bursting pressure of the high-pressure airbag 25. The pressure inside the high-pressure airbag 25 can be determined based on the ideal gas equation (9):

[0079] PV=nRT(9)

[0080] In formula (1), P is the pressure of the high-pressure airbag 25 when the shell 3 ruptures; V is the volume of the high-pressure airbag 25 when the shell 3 ruptures; n is the number of moles of gas inside the high-pressure airbag 25 when the shell 3 ruptures; R is the ideal gas constant; and T is the absolute temperature. According to formula (9), n can be calculated, and then according to n=V' / V m , V m is the molar volume of the gas and it is a constant value, so the standard atmospheric pressure volume V' that the air compressor needs to fill into the high-pressure gas chamber 19 can be calculated.

[0081] The present invention also provides a method for using a gas-driven fire extinguishing bomb. The gas-driven fire extinguishing bomb has been described in detail in the above embodiments and will not be repeated here. The method for using a gas-driven fire extinguishing bomb includes:

[0082] S1, use the air compressor to fill the high-pressure air chamber 19 with gas through the valve core 18 in advance, the air pressure sensor 16 detects the air pressure of the high-pressure air chamber 19 in real time and sends the air pressure data to the controller, and when the controller determines that the air pressure of the high-pressure air chamber 19 reaches the preset pressure based on the air pressure data, it stops filling the high-pressure air chamber 19.

[0083] S2, when the gas-driven fire extinguishing bomb is in the barrel movement stage of the projectile launcher, the wing 11 of the open tail wing is connected to the tail wing groove 8 through the rotating shaft 12, and the wing 11 is limited by the bomb belt 6.

[0084] S3, after the gas-driven fire extinguishing projectile is ejected from the muzzle of the projectile launcher, the band 6 expands, creating a gap between the band 6 and the band groove 7. The propelling gas in the gap (herein, the propelling gas generated when the projectile launcher launches the gas-driven fire extinguishing projectile) suddenly expands, instantly destroying the band 6. Under the pressure of the propelling gas, the band 6 flies away from the shell case 3. After the band 6 flies away, the restraint on the open fins is removed. Under the action of the tension spring 14, the fins 11 rotate with the rotating shaft 12. When the slot 27 rotates to the position of the buckle 13, the slot 27 and the buckle 13 cooperate to secure the open fins. The expansion of the band 6 is caused by the relative rotation between the barrel and the fire extinguishing projectile, which causes slight wear and centrifugal inertia on the inner diameter of the plastic band 6, causing the band 6 to expand, resulting in a gap between the outer diameter of the band groove 7 and the inner diameter of the band 6.

[0085] S4, the position sensor 15 monitors the position of the gas-driven fire extinguishing bomb in real time and sends the position data to the controller. When the controller determines that the gas-driven fire extinguishing bomb has reached the specified position based on the position data, the controller controls the inflation solenoid valve 21 to open, and the gas in the high-pressure gas chamber 19 is filled into the high-pressure airbag 25. The high-pressure airbag 25 expands and quickly squeezes the dry powder fire extinguishing agent 24, driving the shell 3 to rupture, and the dry powder fire extinguishing agent 24 is thrown outward and falls to the location where the fire needs to be extinguished.

[0086] The gas-driven fire extinguishing bomb and its use method provided in the embodiments of the present invention have the following characteristics:

[0087] (1) The design uses high-pressure gas in the high-pressure gas chamber 19 to fill the high-pressure airbag 25 to drive the shell 3 to rupture and spread the dry powder fire extinguishing agent 24 in the gas-driven fire extinguishing bomb. Since the gas-driven fire extinguishing bomb does not use gunpowder when spreading, the safety risks of the gas-driven fire extinguishing bomb during production, transportation, storage and use are reduced, effectively reducing casualties and property losses caused by gunpowder safety issues.

[0088] (2) The gas-driven fire extinguishing bomb design uses the gas in the high-pressure gas chamber 19 to fill the high-pressure airbag 25. The high-pressure airbag 25 expands and drives the shell 3 to rupture, thereby dispersing the dry powder fire extinguishing agent 24. This method is different from the previous pneumatic fire extinguishing bomb method that uses gas to push the piston, and the piston drives the fire extinguishing agent to be dispersed through the open head. The use of the high-pressure airbag 25 to expand and rupture the shell makes the dispersion of the dry powder fire extinguishing agent 24 faster and more uniform, improving the fire extinguishing efficiency.

[0089] (3) The gas-driven fire extinguishing bomb eliminates the original complex mechanical structure design and uses the high-pressure airbag 25 to expand and rupture the shell to replace the original complex mechanical structure design of the warhead opening and piston pushing. The high-pressure airbag 25 made of flexible and lightweight materials not only effectively reduces the overall weight of the gas-driven fire extinguishing bomb and increases the flight distance of the gas-driven fire extinguishing bomb, but also makes the inspection and maintenance of the gas-driven fire extinguishing bomb more convenient, thereby improving the economic benefits of the gas-driven fire extinguishing bomb.

[0090] (4) The outer wall of the shell 3 is designed with longitudinal grooves 4 and transverse grooves 5. When the shell 3 is subjected to the shock wave of the gunpowder, it can explode and rupture along the longitudinal grooves 4 and transverse grooves 5 on the outer wall of the shell 3. In this way, the size and shape of the fragments of the shell 3 can be controlled, so that the dry powder fire extinguishing agent 24 inside is more evenly and fully dispersed, ensuring the uniformity of the dispersion of the fire extinguishing agent and improving the fire extinguishing efficiency of the gas-driven fire extinguishing bomb. At the same time, the controllability of the fragments of the shell 3 of the gas-driven fire extinguishing bomb is enhanced, reducing the risk of damage to the environment and personnel around the fire scene caused by the fragments of the shell 3, making the operation process of the gas-driven fire extinguishing bomb safer.

[0091] (5) The design of the open tail improves the stability of the gas-driven fire-extinguishing bomb during flight, enabling it to accurately reach the fire scene from a long distance to carry out fire extinguishing work, quickly and effectively controlling the fire, thereby reducing the casualties in the fire. In addition, the precise and efficient fire-extinguishing capability helps to reduce the damage to forests, property and the environment caused by fire, and has a significant protective effect on social resources.

[0092] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A gas-driven fire extinguishing bomb, characterized in that: The invention comprises a cartridge case (3), wherein the top of the cartridge case (3) is connected to a first baffle (2), the top of the first baffle (2) is connected to a bullet top (1), the outer wall of the cartridge case (3) is provided with a plurality of mutually parallel longitudinal grooves (4), a plurality of mutually parallel transverse grooves (5), a band groove (7) and four tail grooves (8), the band groove (7) and the four tail grooves (8) are located at the bottom of the cartridge case (3), the four tail grooves (8) are evenly distributed along the circumference of the bottom of the cartridge case (3), an elastic band (6) is placed in the band groove (7), the inner diameter of the band (6) matches the outer diameter of the band groove (7), a first protrusion is connected to the position where the tail groove (8) is located on the cartridge case (3), an open tail is located in the tail groove (8), and the open tail comprises a tail base (9) and a wing (11 ), a rotating shaft (12) is connected to the first protrusion, the first protrusion is also connected to the tail base (9), the wing (11) is rotatably connected to the rotating shaft (12), the top of the wing (11) is higher than the elastic belt (6) so that the wing (11) is limited by the elastic belt (6), the tail base (9) is L-shaped, the side of the vertical part and the top surface of the horizontal part of the tail base (9) are connected with connecting rods, and the two connecting rods are connected with tension springs (14), the side of the horizontal part of the tail base (9) is connected with a buckle (13), the bottom end of the wing (11) is provided with a slot (27), the buckle (13) can be snapped into the slot (27), a position sensor (15) is connected to one side of the top of the first baffle (2), a fire extinguishing drive device is connected inside the shell (3), and the bottom end of the shell (3) is connected to the shell bottom (10); The fire extinguishing drive device includes a high-pressure air chamber cavity (20), the high-pressure air chamber cavity (20) is connected to the bottom surface of the first baffle (2), a high-pressure air chamber (19) is formed between the first baffle (2) and the high-pressure air chamber cavity (20), a valve core (18) is connected to the middle of the first baffle (2), an air inlet of the valve core (18) is used to be connected to an external air compressor, and an air outlet of the valve core (18) is communicated with the high-pressure air chamber (19), a pressure sensor (16) is connected to one side of the bottom surface of the first baffle (2), and the pressure sensor (16) is located in the high-pressure air chamber (19), an inflation electromagnetic valve (21) is connected to the middle of the bottom surface of the high-pressure air chamber cavity (20), and an inflation electromagnetic valve (21) is connected to the inflation electromagnetic valve (21). The air inlet of the electromagnetic valve (21) is communicated with the high-pressure air chamber (19), the air outlet of the inflation electromagnetic valve (21) is connected to the inflation pipe (23), and the air outlet of the inflation electromagnetic valve (21) is communicated with the air inlet of the inflation pipe (23), the air outlet of the inflation pipe (23) is connected to the high-pressure air bag (25), the upper middle part of the shell (3) is connected to the second baffle (22), the inflation pipe (23) is connected to the middle part of the second baffle (22), the space between the second baffle (22) and the shell (3) is filled with dry powder fire extinguishing agent (24), and the air pressure sensor (16), the inflation electromagnetic valve (21) and the position sensor (15) are all electrically connected to the controller.

2. The gas-driven fire extinguishing bomb according to claim 1, characterized in that: The spring top (1) is a truncated cone structure.

3. The gas-driven fire extinguishing bomb according to claim 1, characterized in that: The longitudinal groove (4) and the transverse groove (5) are both V-shaped grooves.

4. The gas-driven fire extinguishing bomb according to claim 1, characterized in that: The materials of the missile base (10) and the open tail fin are both aluminum alloy.

5. The gas-driven fire extinguishing bomb according to claim 1, characterized in that: The rotating shaft (12) comprises an inner ring and an outer ring, the first protrusion is connected to the inner ring of the rotating shaft (12), the outer ring of the rotating shaft (12) is provided with a groove, the wing (11) is connected to the second protrusion, and the second protrusion is clamped in the groove of the rotating shaft (12).

6. The gas-driven fire extinguishing bomb according to claim 1, characterized in that: The materials of the bullet top (1), the first baffle (2), the bullet shell (3) and the second baffle (22) are all ABS plastic, and the material of the bullet belt (6) is plastic.

7. The gas-driven fire extinguishing bomb according to claim 1, characterized in that: A sealing ring (17) is connected between the second baffle (22) and the cartridge case (3).

8. The gas-driven fire extinguishing bomb according to claim 1, characterized in that: The top edge of the second baffle (22) is connected with a flange (26).

9. A method for using a gas-driven fire extinguishing bomb, characterized in that: The gas-driven fire extinguishing bomb according to any one of claims 1 to 8 comprises: S1, using an air compressor to fill the high-pressure air chamber (19) with gas through the valve core (18) in advance, the air pressure sensor (16) detects the air pressure of the high-pressure air chamber (19) in real time and sends the air pressure data to the controller, and when the controller determines that the air pressure of the high-pressure air chamber (19) reaches a preset pressure based on the air pressure data, the controller stops filling the high-pressure air chamber (19); S2, when the gas-driven fire extinguishing bomb is in the barrel movement stage of the projectile launching device, the wing (11) of the open tail wing is connected to the tail wing groove (8) through the rotating shaft (12), and the wing (11) is limited by the bomb belt (6); S3, when the gas-driven fire extinguishing ejection projectile is ejected from the muzzle of the projectile launching device, the band (6) expands to form a gap between the band (6) and the band groove (7), and the launch gas in the gap suddenly expands to instantly destroy the band (6), and the band (6) flies away from the shell (3) under the action of the launch gas pressure; when the band (6) flies away, the constraint on the open tail fin disappears, and under the action of the tension spring (14), the wing (11) rotates with the rotating shaft (12), and when the clamping slot (27) rotates to the position of the buckle (13), the clamping slot (27) cooperates with the buckle (13) to fix the open tail fin; S4, the position sensor (15) monitors the position of the gas-driven fire extinguishing bomb in real time and sends the position data to the controller. When the controller determines that the gas-driven fire extinguishing bomb has reached the designated position based on the position data, the controller controls the inflation electromagnetic valve (21) to open, and the gas in the high-pressure gas chamber (19) is filled into the high-pressure airbag (25). The high-pressure airbag (25) expands and quickly squeezes the dry powder fire extinguishing agent (24), driving the shell (3) to rupture, and the dry powder fire extinguishing agent (24) is thrown outward and falls into the position where the fire needs to be extinguished.

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