JP5845939B2 - Flame suppression material - Google Patents

Description

  The present invention relates to a flame suppression material that is loaded in an ammunition and suppresses the generation of a flame by the combustion gas of a propellant generated inside a cannon coming into contact with the outside air.

  Conventionally, for example, in artillery guns such as grenades, it is included in the combustion gas when the flying object is injected by the pressure of the high-temperature gas (combustion gas) generated by burning the propellant loaded in the chamber. High temperature carbon monoxide and hydrogen that reacts with the oxygen in the outside air at the tip of the gun (muzzle) may cause a flame (muzzle flame). The same applies to a so-called empty package in which only a sound is generated by replacing a real bullet with a lid made of wood or paper and destroying the lid with the pressure of combustion gas. Also, when opening the end plug of the gun to load the next ammunition, the so-called flare back, in which a flame is ejected to the rear of the chamber by touching the combustion gas remaining in the chamber and the outside air, May occur.

  Muzzle flames have high illuminance flames, so it is easier to specify the position of the artillery. For this reason, techniques for incorporating flame retardants such as potassium nitrate into propellants have been widely known. It has been. However, in the method of kneading the flame retardant into the propellant, the amount of the flame retardant added to the propellant is limited in production, and the flame suppression effect may not be sufficiently obtained. On the other hand, this applicant has proposed putting potassium nitrate etc. into a cloth bag, and arrange | positioning it separately from a propellant in the propellant used by an empty package (patent document 1). This technology takes into consideration the safety of workers when loading the next ammunition, and it has been confirmed that flare back can be reduced.

JP 2011-242054 A

  The amount of the anti-inflammatory agent is not limited as long as the anti-inflammatory agent is placed in a cloth bag and disposed separately from the propellant in the propellant. Therefore, a higher flame suppression effect is expected by increasing the amount of the flame retardant. However, there were cases where the expected high flame suppression effect was not exhibited. One of the causes is that the anti-flamming agent gathered in the cloth bag is melted by the heat of combustion of the propellant and becomes a lump, or it is fused with the cloth bag, resulting in a reduction in the working efficiency against the combustion gas. Was inferred. Another reason is that as the propellant burns, the cloth bag that wraps the flame retardant breaks, and the flame retardant dissociates and is blown away from the propellant toward the muzzle. It was also inferred that there was a case where the flame could not be sufficiently contacted and the flame suppression effect could not be obtained efficiently. In particular, it was considered that such a tendency tends to occur in ammunition and empty packaging using a propellant with a high burning rate.

  In view of this, the present inventors have eagerly studied whether or not the flame retardant can be effectively applied to the combustion gas and the generation of the flame can be suppressed by keeping the flame retardant in a predetermined position without being biased. And, by disposing the flame retardant supported on the sheet-like base material inside the propellant and the cartridge case, it was found that a high flame suppression effect can be exhibited more reliably, and the completion of the present invention It came.

  That is, the subject of this invention is making it possible to exhibit the high flame suppression effect more reliably.

  The present invention is a flame suppression material that is loaded in an ammunition and suppresses the generation of a flame by the combustion gas of a propellant generated inside a gun that touches the outside air, and the flame retardant is carried on a sheet-like base material It is a flame suppression material characterized by being made.

  According to the flame suppression material of the present invention, since the flame retardant is supported on the base material, the flame retardant does not fall apart even if the propellant starts to burn. Therefore, it stays in the predetermined arrangement | positioning position in an ammunition, and can act on combustion gas more reliably. Thereby, it is possible to make it difficult to generate a flame when the combustion gas comes into contact with the outside air, and muzzle flames and flarebacks can be reduced or eliminated.

  The sheet-like base material is preferably made of a flammable material. In that case, the base material also burns quickly as the propellant burns, so that it is difficult for the residue to remain inside the gun after firing (including empty packet shooting).

  Use of paper or cloth as the sheet-like base material is preferable because it easily supports the flame retardant.

  As the flame retardant, an alkali metal salt can be preferably applied.

  The flame-suppressing material of the present invention can be loaded inside a gun and loaded into a gun. In this case, it is desirable to install the flame suppression material on the side of the propellant or on the side of the propellant.

  According to the present invention, it is possible to more reliably exhibit a high flame suppression effect by holding the flame retardant at a predetermined position in the gun and effectively causing the flame retardant to act on the combustion gas of the propellant. it can.

It is a figure which shows the flame suppression material which concerns on Embodiment 1 of this invention, (a) is a top view, (b) is II sectional drawing of the flame suppression material shown by (a). FIG. 3 is a diagram schematically showing a configuration of a gun as a longitudinal section in relation to the first embodiment of the present invention. It is a figure which shows the propellant which concerns on Embodiment 1 of this invention, (a) is an axial sectional view, (b) is III-III sectional drawing of the propellant shown by (a). It is a figure which shows the propellant which concerns on Embodiment 2 of this invention, (a) is an axial sectional view, (b) is IV-IV sectional drawing of the propellant shown by (a). It is an axial sectional view of a medicine casing concerning Embodiment 3 of the present invention. It is a figure which shows the projectile charge which concerns on the comparative example 1, (a) is axial sectional drawing, (b) is VI-VI sectional drawing of the projectile charge shown by (a).

  In the flame suppression material of the present invention, the flame retardant is supported on a sheet-like substrate, and the flame retardant adheres to the sheet-like substrate as a whole.

  As the flame retardant, conventionally, a flame retardant added to the propellant to reduce muzzle flame and muzzle flame can be used, and for example, alkali metal salts such as potassium nitrate and potassium sulfate can be used. Alkaline earth metal salts such as barium nitrate can also be used. Alternatively, an anti-inflammatory agent such as ammonium carbonate or melamine can be used. An anti-inflammatory agent may be used alone or in combination of two or more.

  The substrate is in the form of a sheet. Here, the sheet shape includes thin and flat shapes such as a thin plate shape, a flake shape, a film shape, and a film shape. The sheet-like substrate may remain flat, or may be formed into an appropriate three-dimensional shape by folding, bending, rounding, or folding. Examples of the sheet-like substrate include paper, fabrics including woven fabrics / knitted fabrics and nonwoven fabrics, sponges, and films.

  The substrate is preferably made of a flammable material. In that case, since the base material burns quickly when the propellant is burned, even when a propellant having a high combustion rate is used, the residue remaining inside the gun can be reduced. As the flammable material used for the substrate, for example, a material mainly composed of cellulose is preferable. For example, paper or cloth mainly composed of cellulose fibers such as natural cellulose fibers such as pulp, cotton and hemp and regenerated cellulose fibers such as rayon are suitable as the base material. A cellulose sponge made of regenerated cellulose can also be used as a substrate.

  As a preferred method for producing the flame suppressant of the present invention, the flame retardant is dissolved in water or a solvent, the solution is added to the substrate, the substrate is dried, and crystals of the flame retardant are deposited on the surface or inside of the substrate. The method of attaching an anti-inflammatory agent to a base material by this is mentioned. The method for adding the solution to the substrate is not particularly limited. For example, various impregnation methods such as a dipping method or a shower method, various coating methods using a roll coater, and the like can be employed. Moreover, the drying method of a base material is not specifically limited, Natural drying may be sufficient and drying may be accelerated | stimulated by pressure reduction, a heating, etc. When the substrate warps or bends due to drying and is deformed into an undesired shape, it is preferable to appropriately take a shape-retaining means. For example, it is possible to prevent the base material from being warped or bent by sandwiching the base material with a wire mesh or applying tension to the base material. In taking such a production method, it is preferable that the base material is made of a material mainly composed of cellulose, since the material itself is excellent in water absorption, and thus it is easy to carry the flame retardant. Moreover, as a form of a base material, the thing which is easy to hold | maintain a liquid is preferable on a structure, and paper, cloth, or sponge is preferable. According to such a manufacturing method, a flame suppression material can be comprised only with a base material and a flame retardant, and the residue which remains in the inside of a gun can be decreased.

  In addition, the method of making a base material carry | support an anti-inflammatory agent is not limited to the said method. For example, an anti-inflammatory agent powder or particles may be adhered or adhered to the surface of the substrate. In this case, as the adhesive or pressure-sensitive adhesive, it is desirable to use, for example, a material excellent in combustibility, such as cellulose, in order to reduce the residue. In addition, for example, the flame retardant may be added to the substrate by a slurry impregnation method in which the substrate is impregnated with a dispersion of the flame retardant.

  In addition, when manufacturing the flame suppression material, the flame retardant may be carried on a base material that is not enlarged or shaped in advance and is finally incorporated into the interior of the cartridge case or the propellant charge. May be formed into a large shape or a shape to be incorporated into the inside of the projectile charge.

  According to such a flame suppression material, the muzzle flame and the flare back can be reduced or eliminated by being mounted inside the cartridge case or the projectile charge loaded in the gun. Hereinafter, with reference to the drawings, a specific embodiment of the flame suppression material of the present invention according to the equipment for a gun will be described.

<Embodiment 1>
In the first embodiment, as shown in FIG. 1, a circular flat flame suppression material 11 in which a filter paper is used as a base material 13 and crystals of the flame retardant 15 are deposited on the surface of the filter paper is used for empty packaging. It is one Embodiment integrated in the inside of 21 (FIG. 3). The propellant charge 21 is obtained by housing the propellant 25 or the like in the burnout case 23. In FIG. 2, the configuration of the gun 31 is very schematically shown. The cannon 31 has a substantially cylindrical shape as a whole, and includes an elongated barrel 35 through which a bullet passes in an actual package, and a chamber 33 provided with an enlarged diameter at the base of the barrel 35. The bottom of the chamber 33 (the end opposite to the gun barrel 35) is closed with a chain plug 39. As shown in FIG. 2, the empty packet is typically filled with a plug 37 in the barrel 35 and loaded with the propellant 21 in the chamber 33 to burn the propellant 25 in the propellant 21. By doing so, the lid stopper is destroyed by the pressure of the combustion gas filled in the chamber 33, and a firing sound can be generated.

  The burnout case 23 (FIG. 3) constituting the propellant 21 is a container that burns as the propellant 25 burns. For example, it can be obtained by mixing nitrocellulose, pulp, resin, etc. in water, sucking it into a papermaking mold, and press molding. It is composed of a cylindrical container-like case body 23a and a case cap 23b. One end on the side of the chain stopper 39 when the case body 23a is loaded into the medicine chamber 33 is closed by the case cap 23b. An opening 24a is provided at the center of the case cap 23b and is closed with a sealing plate 24b. The sealing plate 24b is made of tin foil, and can ignite the flame of a fire tube (not shown) inserted through a fire hole 39h formed in the chain plug 39 in order to ignite the propellant 25. .

  The propellant 25 contained in the burnout case 23 has a basic composition of nitrocellulose, which is combined with one or two kinds of nitroglycerin and nitroguanidine, and a combustion adjusting agent and a stabilizer. Commonly used propellants such as those added can be used. These propellants include sticks and granules. As the igniting agent 27, a commonly used igniting agent such as a black explosive or a single base igniting agent can be used.

  In the explosive charge 21, in the burnout case 23, an igniting powder 27 wrapped in a medicine so as to cover the opening 24a is accommodated just inside the case cap 23b. And the propellant 25 is accommodated in the state wrapped in the medicine bag in the center.

  The flame suppression material 11 is substantially perpendicular to the axial direction of the burnout case 23 so that the propellant 21 is positioned at the tip side (muzzle side) of the propellant 25 when loaded in the chamber 33. Built to be. One or a plurality of flame suppression materials 11 are incorporated into the projecting charge 21 by appropriately adjusting the number according to the total amount of the flame retardant 15 to be included in the projecting charge 21.

<Embodiment 2>
The second embodiment will be described with reference to FIG. Embodiment 2 is another embodiment in which the flame suppression material of the present invention is incorporated in the projectile charge 21. The members that do not need to be changed from the first embodiment are denoted by the same reference numerals in the drawing, and detailed description thereof is omitted here.

  In the second embodiment, the rectangular sheet-shaped flame suppression material 11 is rolled into a cylindrical shape and incorporated in the burnout case 23 so as to surround the propellant 25. The flame suppression material 11 may be set in an amount to be incorporated in accordance with the total amount of the flame retardant 15 to be included in the firing charge 21, or may be incorporated in a single or double or more. Moreover, you may incorporate so that the circumference | surroundings of the propellant 25 may be covered partially.

<Embodiment 3>
Embodiment 3 is an embodiment in which a circular flat flame suppressing material 11 as shown in FIG. 1 is incorporated into a cartridge case 41 together with a propellant 43 as shown in FIG. The cartridge case 41 is a bottomed cylindrical container, and includes a body portion 45 that accommodates the propellant 43, and a neck portion 49 that is smaller in diameter than the body portion 45 is provided on the distal end side via a tapered shoulder portion 47. Subsequently, the bullet 53 is clamped and held in the shed 51. A detonator 57 for igniting the propellant 43 can be attached to the bottom 55 of the cartridge case 41. In the cartridge case 41, the flame suppression material 11 is incorporated so as to be substantially orthogonal to the axial direction on the tip side (the side of the mouth 51) from the propellant 43. One or a plurality of flame suppression materials 11 are incorporated in the cartridge case 41 by appropriately adjusting the number according to the total amount of the propellant 25.

<Other forms>
In the first and second embodiments, the example in which the flame suppression material is incorporated in the propellant that is configured by accommodating the propellant or the like in the hard burnout case is shown, but the form of the propellant is not limited thereto. In addition, the flame suppression material of the present invention can be incorporated into a cloth bag or the like that is configured by containing a propellant or the like in a soft burnout member. However, the case where it is accommodated in a hard burnout case is preferable in that the flame suppression material can be easily held at a certain position. Moreover, as a form of accommodating the flame suppression material in the propellant, it is arranged at the front of the propellant as in the first embodiment, or is arranged so as to surround the side of the propellant as in the second embodiment. In addition, it may be arranged behind the propellant. The same is true for shells. In the case where the flame suppression material is arranged at the front side or the side of the propellant, the flame retardant can be more efficiently caused to act on the combustion gas of the propellant, and is more preferable. In addition, it is also preferable in that it can be arranged without considering the influence of the rear ignition on the ignition system. Most preferably, it is placed ahead of the propellant. In this case, the flame retardant can be most efficiently caused to act on the combustion gas of the propellant.

  Hereinafter, specific examples and comparative examples will be given to describe the evaluation results of the flame suppression material. However, the present invention is not limited to these examples.

(Example 1)
In Example 1, a disk-shaped filter paper having a diameter of 140 mm and a thickness of 0.5 mm was used as the base material, and potassium nitrate was used as the flame retardant. First, the filter paper was immersed in a saturated aqueous solution of potassium nitrate at 70 ° C., and then dried at 50 ° C. for 7 days to obtain a circular thin plate-like flame suppression material having about 10 g of potassium nitrate crystals attached thereto. Next, the obtained four flame suppression materials were incorporated into the burnout case so that the flame suppression material was positioned in front of the propellant as in the first embodiment (FIG. 3), thus creating a propellant charge. . As the propellant, 1.1 kg of a single-hole tubular single base propellant mainly composed of nitrocellulose was used. Then, it was loaded into the chamber of the howitzer, a lid made of wood fiber board was placed in front of it, and the empty package was shot by igniting with a fire tube incorporated in the chain plug.

  As a result, the occurrence of muzzle flame was not observed at the time of launch. In addition, flareback did not occur when the chain stopper was opened after launch. Neither potassium nitrate melt nor unburned filter paper was found in the chamber and gun barrel after launch.

(Example 2)
In Example 2, a rectangular filter paper having a size of 615 mm × 100 mm and a thickness of 0.5 mm was used as the base material, and potassium nitrate was used as the flame retardant. First, the filter paper was immersed in a saturated aqueous solution of potassium nitrate at 70 ° C. and then dried at 50 ° C. for 7 days to obtain a rectangular sheet-shaped flame suppression material having about 40 g of potassium nitrate crystals attached thereto. Next, one obtained flame suppression material is rolled into a cylindrical shape, and flame is formed on the inner peripheral surface of the burnout case so as to surround the periphery of the propellant with the flame suppression material as in the second embodiment (FIG. 4). A propellant was created incorporating a suppressor. In addition, the thing similar to the said Example 1 was used for the propellant. Then, it was loaded into the chamber of the howitzer, a lid made of wood fiber board was placed in front of it, and the empty package was shot by igniting with a fire tube incorporated in the chain plug.

  As a result, a slight muzzle flame was observed at the time of launch, but no flareback occurred when the chain was opened after launch. Neither potassium nitrate melt nor unburned filter paper was found in the chamber and gun barrel after launch.

(Comparative Example 1)
In Comparative Example 1, instead of the flame suppression material, a medicinal capsule in which 40 g of granular potassium nitrate was wrapped in a silk bag was prepared. Then, as shown in FIG. 6, the gunpowder 61 containing potassium nitrate was incorporated in the burnout case 23 so as to be positioned ahead of the propellant 25, thereby creating a propellant charge 21. In addition, the thing similar to the said Examples 1 and 2 was used for the propellant. Then, it was loaded into the chamber of the howitzer, a lid made of wood fiber board was placed in front of it, and the empty package was shot by igniting with a fire tube incorporated in the chain plug.

  As a result, muzzle flames were recognized at the time of launch, and flarebacks were also small for a moment. Moreover, the residue which potassium nitrate adhered to the silk bag remained in the medicine chamber.

  From the evaluation results of the above examples and comparative examples, by incorporating the flame suppression material obtained by supporting the flame retardant on the sheet-like base material in the firing charge, muzzle flame and flare back are reduced or It was confirmed that the flame suppressing effect can be exhibited. Among these, it was confirmed that the flame suppression effect is more effectively exhibited by disposing the flame suppression material ahead of the propellant. In that case, it was confirmed that the residue could also be suppressed.

DESCRIPTION OF SYMBOLS 11 Flame suppression material 13 Base material 15 Extinguishing agent 21 Firing charge 23 Burn-out case 25 Propellant 31 Gun 33 Chemical chamber

Claims (6)

A flame suppression material that is loaded in ammunition and suppresses the generation of flames when the combustion gas of the propellant generated inside the cannon touches the outside air,
A flame suppressant comprising a flame retardant supported on the surface of a sheet-like substrate.   The flame suppression material according to claim 1, wherein the sheet-like base material is made of a flammable material.   The flame suppression material according to claim 1 or 2, wherein the sheet-like base material is paper or cloth.   The flame retardant according to any one of claims 1 to 3, wherein the flame retardant is an alkali metal salt.   An ammunition characterized in that the flame suppression material according to any one of claims 1 to 4 is provided therein. The ammunition according to claim 5, wherein the flame suppression material is provided on the side of the propellant or on the side of the propellant.

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