Novel gas-driven fire extinguishing bomb and use method thereof

Abstract

The invention relates to a novel gas-driven fire extinguishing bomb and a using method thereof, and belongs to the technical field of fire fighting equipment. Comprising a cartridge case, the top end of the cartridge case is connected with a first baffle, the top end of the first baffle is connected with a cartridge top, the outer wall of the cartridge case is provided with a longitudinal notch groove, a transverse notch groove, a cartridge band groove and four empennage grooves, a cartridge band is placed in the cartridge band groove, an open empennage is located in the empennage grooves, the bottom end of the cartridge case is connected with a cartridge bottom, and a high-pressure air chamber is connected with the bottom face of the first baffle. A high-pressure air chamber is formed between the first baffle and the high-pressure air chamber cavity, the middle of the first baffle is connected with a valve core, the middle of the bottom face of the high-pressure air chamber cavity is connected with an inflation electromagnetic valve, an air outlet of an inflation pipeline is connected with a high-pressure air bag, and the cartridge case is connected with a second baffle. And a dry powder extinguishing agent is filled between the second baffle and the cartridge case. The unmanned aerial vehicle is low in safety risk, the dry powder extinguishing agent is thrown more quickly and uniformly, inspection and maintenance are convenient, and the flight process is more stable.

Description

Technical Field

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

[0002] In order to speed up or facilitate fire extinguishing, fire extinguishing bombs are used in some scenarios, such as forest fire extinguishing. The fire extinguishing principle of fire extinguishing bombs is: the fire extinguishing agent inside the fire extinguishing bomb is thrown 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 dispersed by gunpowder. The design and manufacture of gunpowder-driven fire extinguishing bombs need to consider safety and reliability because of the use of 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 the fire extinguishing agent: the gas stored in the high-pressure gas chamber of the fire extinguishing bomb body drives the piston to move, and 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 fire extinguishing agent dispersion. 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 relatively large, the mass of the fire extinguishing bomb is large, the flight distance is limited, and it is not convenient to repair and inspect the fire extinguishing bomb. Summary of the invention

[0006] In order to solve the above technical problems, the present invention provides a new type of gas-driven fire extinguishing bomb and its use method. The technical solution of the present invention is as follows:

[0007] The invention provides a novel gas-driven fire-extinguishing bomb, which comprises 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 band groove and four tail grooves are provided on the outer wall of the shell, the band 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, a band is placed in the band groove, the inner diameter of the band matches the outer diameter of the band groove, a first protrusion is connected to the position where the tail groove on the shell is located, an open tail is located in the tail groove, and an open tail is arranged in the tail groove. The open tail comprises a tail base and a wing, a first protrusion is connected with a rotating shaft, the first protrusion is also connected with the tail base, the wing is rotatably connected with 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 base is L-shaped, the side of the vertical part and the top surface of the horizontal part of the tail base are connected with connecting rods, the two connecting rods are connected with tension springs, the side of the horizontal part of the tail base is connected with a buckle, the bottom end of the wing is provided with a slot, the buckle can be inserted into the slot, one side of the top of the first baffle is connected with a position sensor, the inside of the shell is connected with a fire extinguishing drive device, and the bottom of the shell is connected with a shell bottom;

[0008] The fire extinguishing drive device includes a high-pressure air chamber cavity, which is connected to the bottom surface of the first baffle plate, and a high-pressure air chamber is formed between the first baffle plate and the high-pressure air chamber cavity. A valve core is connected to the middle of the first baffle plate, and an air inlet of the valve core is used to be connected to an external air compressor. The air outlet of the valve core is connected to the high-pressure air chamber. An air pressure sensor is connected to one side of the bottom surface of the first baffle plate, and the air pressure sensor is located in the high-pressure air chamber. An inflation solenoid valve is connected to the middle of the bottom surface of the high-pressure air chamber cavity, and the air inlet of the inflation solenoid valve is connected to the high-pressure air chamber. The air outlet of the inflation solenoid valve is connected to an inflation pipe, and the air outlet of the inflation solenoid valve is connected to the air inlet of the inflation pipe. The air outlet of the inflation pipe is connected to a high-pressure airbag. A second baffle is connected to the upper and middle part of the shell, and the inflation pipe is connected to the middle of the second baffle plate. Dry powder fire extinguishing agent is filled between the second baffle plate and the shell, and the air pressure sensor, the inflation solenoid valve and the position sensor are all electrically connected to the controller.

[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 open 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 with 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 novel gas-driven fire extinguishing bomb, which uses the novel gas-driven fire extinguishing bomb, comprising:

[0017] S1, using an air compressor to charge the high-pressure air chamber 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 a preset pressure according to the air pressure data, the controller stops charging the high-pressure air chamber;

[0018] S2, the new 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 groove through the rotating shaft, and the fins are limited by the bomb belt;

[0019] S3, when the new gas-driven fire extinguishing device is ejected from the muzzle of the projectile launcher, the band expands so that a gap is formed between the band and the band groove, and the launch gas in the gap suddenly expands to instantly destroy the band, and the band flies away from the shell under the action of the launch gas pressure; when the band flies away, the constraint on the open tail fin disappears, and under the action of the tension spring, the wing rotates with the shaft, and 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 new gas-driven fire extinguishing bomb in real time and sends the position data to the controller. When the controller determines that the new 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, causing the shell to rupture, and the dry powder fire extinguishing agent is scattered outward and falls into the position 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 the combinations.

[0022] By means of the above scheme, 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 filling the high-pressure air in the high-pressure air chamber into the high-pressure airbag, the high-pressure airbag expands to drive the shell to rupture and realize the scattering of the dry powder fire extinguishing agent, the new gas-driven fire extinguishing bomb provided by the present invention not only reduces the safety risk of the new gas-driven fire extinguishing bomb in the process of production, transportation, storage and use, but also speeds up the scattering process of the fire extinguishing agent, and improves the effective fire extinguishing range and scattering uniformity of the fire extinguishing agent. In addition, the use of the high-pressure airbag expansion and shell rupture method not only makes the scattering of the dry powder fire extinguishing agent faster and more uniform, improves the fire extinguishing efficiency, but also effectively reduces the overall mass of the new gas-driven fire extinguishing bomb, improves the flight distance of the new gas-driven fire extinguishing bomb, and also makes the inspection and maintenance of the new 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 it is affected by the gunpowder shock wave, thereby controlling the size and shape of the shell fragments, allowing the internal dry powder fire extinguishing agent to be more evenly and fully scattered, thereby improving the fire extinguishing efficiency of the new gas-driven fire extinguishing bomb; at the same time, the controllability of the shell rupture fragments of the new gas-driven fire extinguishing bomb is enhanced, reducing the risk of shell fragments causing harm to the environment and personnel around the fire scene, making the action process of the new gas-driven fire extinguishing bomb safer. By setting up an open tail wing, the stability of the new gas-driven fire extinguishing bomb during flight is improved, and it can achieve long-distance accurate arrival at the fire scene and carry out fire extinguishing work, quickly achieving the purpose of effectively controlling the fire, thereby reducing the casualties rate 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 in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

[0028] Figure 3 The invention discloses a schematic diagram of the connection relationship between the open tail wing and the surrounding components in the novel gas-driven fire-extinguishing bomb provided by the 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 bottom, 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 specific implementation of the present invention is further described in detail below in conjunction with 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, a novel gas-driven fire-extinguishing bomb provided by an embodiment of the present invention comprises a shell 3, a first baffle 2 is threadedly connected to the top of the shell 3, a bomb top 1 is threadedly connected to the top of the first baffle 2, a plurality of mutually parallel longitudinal grooves 4, a plurality of mutually parallel transverse grooves 5, an elastic belt groove 7 and four tail wing grooves 8 are provided on the outer wall of the shell 3, the elastic belt groove 7 and the four tail wing grooves 8 are located at the bottom of the shell 3, the four tail wing grooves 8 are evenly distributed along the circumference of the bottom of the shell 3, an elastic belt 6 is placed in the elastic belt groove 7, the inner diameter of the elastic belt 6 matches the outer diameter of the elastic belt groove 7, a first protrusion is connected to the position where the tail wing groove 8 is located on the shell 3, an open tail wing is located in the tail wing groove 8, and the open tail wing includes a tail wing bottom The seat 9 and the wing 11, the first protrusion is threadedly connected with the rotating shaft 12, the first protrusion is also threadedly connected with the tail base 9, the wing 11 is rotatably connected with 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 fixedly 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 inserted into the slot 27, the top side of the first baffle 2 is threadedly connected with a position sensor 15, the shell 3 is connected with a fire extinguishing drive device, and the bottom of the shell 3 is threadedly connected with a shell bottom 10;

[0034] The fire extinguishing drive device includes a high-pressure air chamber cavity 20, which is threadedly connected to the bottom surface of the first baffle 2, and 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 threadedly connected to the middle of the first baffle 2, and 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 air chamber 19. A pressure sensor 16 is threadedly 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 threadedly connected to the middle of the bottom surface of the high-pressure air chamber cavity 20, and 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, a 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 a dry powder fire extinguishing agent 24 is filled between the second baffle 22 and the cartridge case 3, and the air pressure sensor 16, the inflation solenoid valve 21 and the position sensor 15 are all electrically connected to the controller.

[0035] The thread profile of the threaded connection can be triangular, and the direction of rotation is right-handed. The first baffle 2 is used to separate the bullet top 1 from the shell 3. The tension spring 14 is initially in a stretched state. The valve core 18 is used to pre-inflate the high-pressure air chamber 19 through an air compressor. The air pressure sensor 16 is used to monitor the air pressure in the high-pressure air chamber 19 during the inflation process to ensure that the air pressure in the high-pressure air chamber 19 can drive the high-pressure air bag 25 to expand and squeeze the dry powder fire extinguishing agent 24 when in use, so that the shell 3 ruptures. The controller can be a single-chip microcomputer, a PLC, etc.

[0036] The inner diameter of the elastic band 6 matches the outer diameter of the elastic band groove 7, which means that there is a gap between the inner diameter of the elastic band 6 and the outer diameter of the elastic band groove 7 when not assembled, providing space for the mutual assembly of the plastic elastic band 6 and the elastic band groove 7. The assembly is achieved by using a heat shrinking method, and the prestress generated by the shrinkage of the plastic elastic band 6 assembled by the heat shrinking method makes the elastic band 6 tightly hold the elastic band groove 7, and at this time 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 material of the bomb base 10 and the open tail fins are both aluminum alloy. The material of the bomb base 10 is aluminum alloy, so that the new gas-driven fire extinguishing bomb can withstand higher launch pressure during launch, thereby increasing the launch distance of the new gas-driven fire extinguishing bomb.

[0040] In a specific embodiment, the rotating shaft 12 includes 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 tail base 9 is connected with a second protrusion, and the second protrusion is stuck in the groove. When the tension spring 14 is reset, the wing 11 and the outer ring of the rotating shaft 12 are driven to rotate toward the position of the buckle 13.

[0041] In a specific embodiment, the materials of the bomb top 1, the first baffle 2, the shell 3 and the second baffle 22 are all ABS plastic, which not only makes the overall weight of the new gas-driven fire-extinguishing bomb relatively light, but also has good impact resistance, which can ensure that the shell 3 will not break during flight. In addition, ABS also has the characteristics of being easy to process, and the shell 3 that meets the requirements can be designed and processed as needed, and compared with metal materials, ABS plastic is relatively low in price, which reduces the production cost of the new gas-driven fire-extinguishing bomb. The material of the bomb belt 6 is plastic.

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

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

[0044] Furthermore, in order to ensure that the new 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 bottom 10 and the top 1, the open tail fins, the longitudinal grooves 4 and the transverse grooves 5, and the specific contents are as follows.

[0045] 1. Thickness of cartridge case 3:

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

[0047]

[0048] In formula (1), P c Indicates the filling pressure of the new gas-driven fire-extinguishing bomb when it 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 new gas-driven fire-extinguishing bomb; P represents the launch pressure of the new 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, and 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) For the bursting pressure of the cartridge case 3, the shell bursting value needs to be greater than the filling pressure. In the embodiment of the present invention, the bursting pressure of the cartridge case 3 is set equal to the filling pressure (i.e., P c =p2) to find the minimum wall thickness of the cartridge case 3.

[0053] 2. Wall thickness of 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 cartridge case 3; p is the maximum pressure in the warhead; and [σ] is the allowable stress of the cartridge case 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 filling material density, a is the maximum acceleration of the new gas-driven fire-extinguishing bomb in the gun chamber, and λ is the new gas-driven fire-extinguishing bomb.

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

[0060] 3. Open tail:

[0061] Specifically, the design of the open tail fin should satisfy the requirement that the belt 6 can ensure that the open tail fin does not open when in the chamber, but can open after exiting the muzzle and quickly reach the position. The condition that the open tail fin does 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 new gas-driven fire-extinguishing bomb, d is the diameter of the shell 3; m is the total mass of the new gas-driven fire-extinguishing bomb; r e ω is the distance between the center of mass of the wing 11 and the axis of the projectile; g The rotation speed of the new gas-driven fire-extinguishing bomb at the muzzle; r cp is the conversion radius of the bore section when the rifling is considered (constant, the specific value is the distance between the axis of the new gas-driven fire-extinguishing bomb and the rifling); x e ,y e They are respectively the longitudinal and axial distances from the center of mass of the open tail wing to the rotation axis when the wing is in the closed 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 new gas-driven fire-extinguishing bomb to the bomb top 1; x s C is the absolute distance from the center of mass of the new gas-driven fire-extinguishing bomb to the bomb top 1; p C is the relative distance from the resistance center of the new gas-driven fire-extinguishing bomb to the bomb top 1; s is the relative distance from the center of mass of the new gas-driven fire-extinguishing bomb to the bomb top 1; l is the total length of the new 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 new gas-driven fire-extinguishing bomb in the subsonic range C yk ≈δ1, δ1 is the projectile flight angle of attack. pk is the lift coefficient of the new gas-driven fire-extinguishing bomb, subsonic stage C 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 cpis the average chord length of the open tail. yw is the lift coefficient of the open tail wing, λ w is the aspect ratio of the open 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 new gas-driven fire-extinguishing bomb, Ma is the flight Mach number of the new fire-extinguishing bomb, Ma=v0 / a', v0 is the flight speed of the new fire-extinguishing bomb, and a' is the speed of sound.

[0068] In order to ensure the flight stability of the new gas-driven fire-extinguishing bomb, B>0 must be achieved. When a good open tail stabilizes the new 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 new gas-driven fire extinguishing bomb, n ro is the resonant speed, χ is the rotational angular velocity ω of the new gas-driven fire extinguishing bomb r Ratio to linear velocity v, k z is a constant related to the aerodynamics of the new 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 resonance 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 unbalanced 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 by 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, and 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 new 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 according to the shell-breaking pressure required for the shell 3 to stably release the fire extinguishing agent. Different high-pressure airbags 25 are selected for different shell-breaking 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-breaking pressure by performing a phased test on the expansion shell-breaking pressure of the high-pressure airbag 25. The pressure inside the high-pressure airbag 25 can be determined according to 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 is ruptured; V is the volume of the high-pressure airbag 25 when the shell 3 is ruptured; n is the number of moles of gas inside the high-pressure airbag 25 when the shell 3 is ruptured; R is the ideal gas constant; 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, 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 embodiment of the present invention also provides a method for using a new type of gas-driven fire extinguishing bomb. The new type of gas-driven fire extinguishing bomb has been described in detail in the above embodiment and will not be repeated here. The method for using the new type of gas-driven fire extinguishing bomb includes:

[0082] S1, use an air compressor to fill gas into the high-pressure air chamber 19 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, stops filling the high-pressure air chamber 19.

[0083] S2, when the new gas-driven fire-extinguishing bomb is in the barrel movement stage of the artillery 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, when the new gas-driven fire extinguishing projectile is ejected from the muzzle of the artillery shell launcher, the band 6 expands so that a gap is formed between the band 6 and the band groove 7, and the launch gas in the gap (the launch gas here is generated when the artillery shell launcher launches the new gas-driven fire extinguishing projectile) suddenly expands to instantly destroy the band 6, and the band 6 flies away from the shell case 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 slot 27 rotates to the position of the buckle 13, the slot 27 cooperates with the buckle 13 to fix the open tail fin. Among them, the reason for the expansion of the band 6 is the relative rotation between the barrel and the new fire extinguishing projectile, which causes the inner diameter of the plastic band 6 to produce slight wear and centrifugal inertia, so that the band 6 has a tendency to expand, so that a gap is generated 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 new gas-driven fire extinguishing bomb in real time and sends the position data to the controller. When the controller determines that the new gas-driven fire extinguishing bomb has reached the specified 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.

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

[0087] (1) The design uses the 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 new gas-driven fire extinguishing bomb. Since the new gas-driven fire extinguishing bomb does not use gunpowder when spreading, the safety risks of the new 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 new gas-driven fire-extinguishing bomb design uses the gas in the high-pressure gas chamber 19 to fill the high-pressure airbag 25, and the high-pressure airbag 25 is inflated to drive the shell 3 to rupture to achieve the method of dispersing the dry powder fire extinguishing agent 24. This is different from the previous pneumatic fire-extinguishing bomb 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, thereby improving the fire extinguishing efficiency.

[0089] (3) The new gas-driven fire-extinguishing bomb eliminates the original complex mechanical structure design and uses a 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 new gas-driven fire-extinguishing bomb and increases the flight distance of the new gas-driven fire-extinguishing bomb, but also makes the inspection and maintenance of the new gas-driven fire-extinguishing bomb more convenient, thereby improving the economic benefits of the new 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 gunpowder, it can explode and rupture along the longitudinal grooves 4 and transverse grooves 5 on the outer wall of the shell 3, thereby controlling the size and shape of the fragments of the shell 3, so that the internal dry powder fire extinguishing agent 24 can be more evenly and fully scattered, ensuring the uniformity of the extinguishing agent spreading, and improving the fire extinguishing efficiency of the new gas-driven fire extinguishing bomb. At the same time, the controllability of the fragments of the shell 3 of the new gas-driven fire extinguishing bomb is enhanced, reducing the risk of damage to the surrounding environment and personnel of the fire scene by the fragments of the shell 3, making the action process of the new gas-driven fire extinguishing bomb safer.

[0091] (5) The design of the open tail improves the stability of the new gas-driven fire-extinguishing bomb during flight, and can accurately reach the fire scene from a long distance to carry out fire extinguishing work, quickly and effectively control the fire, thereby reducing the casualties in the fire. In addition, the precise and efficient fire-fighting capability helps reduce the loss of 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 a person skilled in the art can make several improvements and modifications without departing from the technical principles of the present invention, and these improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A new type of gas driven fire extinguishing bomb, characterized in that: The invention comprises a cartridge case (3), the top of which is connected to a first baffle (2), the top of which is connected to a bullet top (1), the outer wall of which is provided with a plurality of mutually parallel longitudinal grooves (4), a plurality of mutually parallel transverse grooves (5), an elastic band groove (7) and four tail wing grooves (8), the elastic band groove (7) and the four tail wing grooves (8) are located at the bottom of the cartridge case (3), the four tail wing grooves (8) are evenly distributed along the circumference of the bottom of the cartridge case (3), an elastic band (6) is placed in the elastic band groove (7), the inner diameter of the elastic band (6) matches the outer diameter of the elastic band groove (7), a first protrusion is connected to the position of the tail wing groove (8) on the cartridge case (3), an open tail wing is located in the tail wing groove (8), and the open tail wing comprises a tail wing base (9) and a wing piece (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), and the buckle (13) can be inserted 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 comprises 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, 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 novel gas-driven fire extinguishing bomb according to claim 1 is characterized in that: The spring top (1) is a truncated cone structure.

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

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

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

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

9. A method for using a new type of gas-driven fire extinguishing bomb, characterized in that: The novel gas-driven fire extinguishing bomb according to any one of claims 1 to 8 comprises: S1, using an air compressor to charge 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 charging the high-pressure air chamber (19); S2, when the new gas-driven fire-extinguishing bomb is in the barrel movement stage of the artillery shell 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 new gas-driven fire extinguishing ejection projectile is ejected from the muzzle of the projectile launching device, the band (6) expands so that a gap is formed between the band (6) and the band groove (7), and the launching gas in the gap suddenly expands so that the band (6) is instantly destroyed, and the band (6) flies away from the shell (3) under the action of the launching 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 slot (27) rotates to the position of the buckle (13), the slot (27) cooperates with the buckle (13) to fix the open tail fin; S4, the position sensor (15) monitors the position of the new gas-driven fire extinguishing bomb in real time and sends the position data to the controller. When the controller determines that the new 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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