JP5309675B2 - Impact sound generator - Google Patents

Description

  The present invention relates to an impact sound generating device used for flying object launch training, repelling harmful birds and beasts, avalanche induction, and the like. More specifically, the present invention relates to an impact sound generating device that suppresses the release of a solid substance when an impact sound is generated, and at the same time, the tightening pressure in the combustion container and the volume of the impact sound are hardly affected by the environmental temperature.

  Conventionally, various devices that generate sound and use the sound are known. For example, many birds and beast repelling devices for repelling harmful birds and beasts are known. This bird-and-life repelling device encloses hydrogen gas and oxygen gas in a 2: 1 molar ratio in a bag made of a resin (polymer) film and reacts the mixed gas with an ignition means to generate an impact sound and is harmful. It repels birds and beasts. This bird and animal repelling device has a simple structure and is characterized in that it is excellent in terms of environment because it only generates water during the reaction. However, even if the structure is simple, in order to operate this bird and animal repelling device multiple times, it is necessary to have a cylinder for storing each gas. For this reason, it is easy to use for use in places with poor scaffolding such as mountainous areas. There was a problem from the point of view. In addition, since sound propagates in all directions, there is a problem from the viewpoint of sound directivity.

  An avalanche inducing bullet is also known as a device for artificially inducing a small avalanche in advance and preventing a large avalanche as an impact sound generator used in mountainous areas. However, this avalanche-inducing bullet is not an avalanche-induced bullet, but rather an avalanche-inducing bullet that contains explosives in the warhead and shoots it into the snow surface by burning propellants to blast the explosives. Therefore, a small avalanche is generated by the impact of the blast.

  Furthermore, as a device that uses sound, in order to give a sense of reality to propellant handlers and other trainees by generating only sound without using an actual flying object in flying object launch training, etc. Sound generators are also known. For example, the gas generated from the empty medicine in the launching device is sealed using a lid stopper in which thin plate-like objects with a low temporary specific gravity are laminated, and a sound is generated when the lid stopper breaks due to the sealed gas pressure. Is. However, this sound generator inevitably has a room for improvement in terms of handleability, because it is inevitable that fragments will pop out at the same time as the sound is generated when the lid stopper breaks.

  In recent years, proposals for solving these problems have been made. Specifically, as a sound generator, an empty package having an empty container, a gas generating agent, an ignition part, an ignition part, a rupturable plate fixed to the empty container, the central part of the rupturable plate being the periphery of the rupturable plate An empty package having a structure that is easily broken by combustion of a gas generating agent is known (see, for example, Patent Document 1). According to this empty package, by making the central part of the rupturable plate selectively fragile, it is possible to reduce the amount of rupturable plate fragments and the scattering distance.

Furthermore, the applicant of the present application has proposed the following sound generation device (see, for example, Patent Document 2). That is, the firing sound generating device is configured by a casing including a bottom wall, a peripheral wall standing upright from the periphery of the bottom wall, and a lid body that covers the front end of the peripheral wall to form an accommodating space therein. It includes an igniter provided on the bottom wall of the body, an ignition agent arranged at a position close to the igniter in the accommodation space, and a gas generating agent loaded in the accommodation space. The casing is incorporated in a training launcher that is not loaded with a flying object, and is configured to generate a tightening pressure in the casing by the combustion gas of the gas generating agent on the peripheral wall or lid of the casing. It has a plurality of discharge holes. According to this firing sound generating device, it is possible to prevent the fragments of the tightening portion from being released, to improve the handleability, and to make the firing sound sufficiently reach the periphery.
Japanese Patent Laying-Open No. 2006-349284 (second page, fourth page and FIG. 1) Japanese Patent Laying-Open No. 2003-279297 (second page, FIGS. 1 and 2)

  However, in the empty package described in Patent Document 1 and the projecting sound generator described in Patent Document 2, although the scattering of debris to the front is suppressed, the combustion pressure in the combustion container changes depending on the environmental temperature during use. At the same time, there is a drawback that the volume of the impact sound generated greatly changes. Furthermore, in a high temperature environment, the combustion vessel is damaged due to an excessive increase in the combustion pressure due to combustion of the gas generant. On the other hand, in a low temperature environment, even if the gas generant burns, the rupture disk bursts due to insufficient combustion pressure. I also had the problem of not doing it.

  Accordingly, an object of the present invention is to provide an impact sound generation device in which the release of solid matter is effectively suppressed when impact sound is generated, and the tightening pressure and the volume of the impact sound in the combustion container are hardly affected by the environmental temperature. Is to provide.

  In order to solve the above-mentioned problems, the present inventors have intensively studied the structure of the combustion container. As a result, the structure is such that the gas discharge hole of the lid is deformed by the pressure in the combustion container and the opening area of the gas discharge hole can be adjusted. Thus, the inventors have found that the object can be achieved and completed the present invention.

That is, the impact sound generator of the first invention in the present invention is provided with a bottom wall, a cylindrical peripheral wall standing upright from the periphery of the bottom wall, and a gas exhaust hole attached to the front end portion of the peripheral wall. A combustion vessel is constituted by the plate-shaped lid body, the gas generating agent is accommodated in the combustion vessel, and an ignition member for burning the gas generating agent is provided on the bottom wall. And, by increasing the tightening pressure in the combustion container based on the combustion of the gas generating agent in the combustion container, the gas discharge hole is enlarged and the opening area thereof is increased, and the tightening pressure is adjusted to 15 to 30 MPa. is configured so that, the gas discharge hole is composed of a plurality of slits intersecting with an opening, it said緊塞pressure is adjusted by a slit having the opening, characterized in Rukoto.

  The impact sound generating device according to a second aspect of the present invention is the impact noise generating device according to the first aspect, wherein the tightening pressure is 15 to 20 MPa and the temperature in the combustion container is 0 when the temperature in the combustion container is −50 ° C. or more and 0 ° C. or less. When the temperature is higher than 60 ° C. and lower than 60 ° C., the tightening pressure is 20-30 MPa.

  The impact sound generator of the third invention is the first or second invention, wherein the difference between the tightening pressure when the temperature in the combustion vessel is 51 ° C. and the tightening pressure when the temperature is −32 ° C. is 10 MPa. And the difference between the volume of the impact sound when the temperature in the combustion container is 51 ° C. and the volume of the impact sound when the temperature inside the combustion container is −32 ° C. is within 12 dB. .

According to a fourth aspect of the present invention, there is provided the impact sound generating device according to any one of the first to third aspects, wherein the gas discharge hole has an opening area of 0.5 to ³ cm ² and a central portion of the lid. It is comprised by the slit extended radially from.

  According to a fifth aspect of the present invention, there is provided the impact sound generating device according to any one of the first to fourth aspects, wherein the lid is made of an iron-based material and has a thickness of 1 to 5 mm. It is characterized by being.

According to the present invention, the following effects can be exhibited.
In the impact sound generator of the first aspect of the invention, the gas exhaust hole is enlarged and the opening area thereof is increased by the increase of the tightening pressure in the combustion container based on the combustion of the gas generating agent in the combustion container. It is configured. For this reason, it can suppress effectively that a cover body receives the increase in the tightening pressure in a combustion container, bursts, and the fragment | piece is scattered. Furthermore, since the tightening pressure in the combustion container is adjusted to 15 to 30 MPa, it is possible to suppress a large change in the tightening pressure in the combustion container and the volume of the impact sound due to the environmental temperature.

  Therefore, the impact sound generation device can effectively suppress the release of solid matter when the impact sound is generated, and can exert the effect that the tightening pressure in the combustion container and the volume of the impact sound are hardly affected by the environmental temperature. it can.

  In the impact sound generator of the second invention, when the temperature in the combustion container is -50 ° C. or more and 0 ° C. or less, the tightening pressure is 15 to 20 MPa and the temperature in the combustion container exceeds 0 ° C. and 60 ° C. or less. In this case, the tightening pressure is 20 to 30 MPa. For this reason, in addition to the effect of the first invention, the tightening pressure in the combustion container is appropriately set according to the temperature in the combustion container, that is, when the environmental temperature is low and when the environmental temperature is high. The volume of the sound can be kept constant regardless of the environmental temperature.

  In the impact sound generator of the third invention, the difference between the tightening pressure when the temperature in the combustion container is 51 ° C. and the tightening pressure when the temperature is −32 ° C. is within 10 MPa, and The difference between the volume of the impact sound when the temperature is 51 ° C. and the volume of the impact sound when the temperature is −32 ° C. is within 12 dB. Accordingly, in addition to the effects of the first or second invention, changes in the tightening pressure and the volume of the impact sound can be sufficiently suppressed with respect to changes in the temperature in the combustion container, that is, the environmental temperature.

  In the impact sound generator of the fourth aspect of the invention, the gas discharge hole is constituted by slits extending radially from the center of the lid. For this reason, in addition to the effects of any one of the first to third inventions, it is possible to easily suppress the change in the tightening pressure and the volume of the impact sound due to the change in the environmental temperature, and to discharge the combustion gas. The accompanying pressure can be dispersed uniformly.

  In the impact sound generator of the fifth invention, the lid is made of an iron-based material and has a thickness of 1 to 5 mm. For this reason, the effect of any one of the first to fourth inventions can be more effectively exhibited.

Hereinafter, embodiments that are considered to be the best modes of the present invention will be described in detail.
As shown in FIG. 1, the launching device 10 is manufactured by imitating an ordinary artillery (bullet), and has a cylindrical chamber (combustion) having a large diameter on the rear end side (lower end side in FIG. 1). (Chamber) 11 and a cylindrical barrel 12 having a small diameter on the front end side are connected via an intermediate taper portion 13, and the rear end portion is sealed by a chain plug 14. This launching device 10 is used for shooting such as training empty packets. An impact sound generator 15 is accommodated at the rear end of the chamber 11 of the launching device 10. The chain plug 14 is configured to be movable in a direction perpendicular to the axis of the launching device 10, and the impact sound generating device 15 can be loaded into and taken out from the launching device 10.

  As shown in FIG. 2, the combustion container 16 constituting the impact sound generator 15 includes a bottom wall 17, a cylindrical peripheral wall 18 erected from the periphery of the bottom wall 17, and a front end portion of the peripheral wall 18. It is composed of a lid 21 having a cylindrical shape with a lid provided with a gas exhaust hole 19 and forming a housing space 20 therein. A male screw portion 22 is threaded on the outer peripheral surface of the front end of the peripheral wall 18, and the lid body 21 has a female screw portion 24 on the inner peripheral surface of the peripheral plate 23, and the female screw portion 24 is a male screw portion 22 of the front end of the peripheral wall 18. And is fixed to the front end portion of the combustion container 16.

  As shown in FIGS. 2 and 3, a gas discharge hole 19 formed by a slit 25 extending in a cross shape is provided at the center of the lid 21. An arc portion 26 is formed at a portion where the slit 25 of the gas discharge hole 19 intersects, and the opening area of the gas discharge hole 19 is expanded. By forming the arc portion 26, a circular hole is provided in the center portion of the lid body 21, gas can be easily discharged from the combustion container 16, and suppression of the tightening pressure is promoted. It has become so. The shape of the gas discharge hole 19 is set based on the total opening area of the gas discharge hole 19, the workability of the gas discharge hole 19, and the like.

  As a material of the bottom wall 17, the peripheral wall 18, and the lid body 21 constituting the combustion container 16, it is necessary to be able to withstand the pressure and heat of gas generated when the impact sound generator 15 is operated. Metal materials such as iron-based materials such as stainless steel, aluminum-based materials, and copper-based materials such as brass can be used. Among these materials, it is most preferable to use an iron-based material from the viewpoint of the strength against the impact caused by the rapid combustion of the gas generating agent and the heat resistance against the combustion gas. Further, the thickness of the lid 21 is not limited so that the strength of the lid 21 is increased, and the gas discharge hole 19 is enlarged due to the increase of the tightening pressure in the combustion container 16 so that the opening area is increased. 5 mm is preferable. When the thickness of the lid 21 is less than 1 mm, the strength of the lid 21 is insufficient, and the lid 21 cannot withstand the increase of the tightening pressure in the combustion container 16 and breaks. As a result, the desired impact sound cannot be obtained, and the fragments pop out forward, causing problems in terms of handling. On the other hand, when the thickness is greater than 5 mm, the portion of the lid 21 that forms the gas discharge hole 19 becomes difficult to be deformed as the tightening pressure in the combustion container 16 increases, and the opening area of the gas discharge hole 19 increases. In other words, the tightening pressure becomes excessive and the impact sound becomes abnormally high.

  Here, the opening area of the gas discharge hole 19 is determined by the following procedure. First, with respect to the impact sound generator 15 provided with the gas discharge hole 19 having a predetermined opening area, a test is performed when the environmental temperature is normal temperature (for example, + 21 ° C.). As a result, when the tightening pressure in the combustion container 16 is high, the opening area of the gas discharge hole 19 is expanded and the test is performed again, and the opening area is set so that the tightening pressure in the combustion container 16 is about 23 MPa. Set. Next, a test is performed when the environmental temperature is low (for example, −32 ° C.) and high temperature (for example, + 51 ° C.). The most appropriate opening area is determined so that the tightening pressure in the combustion container 16 is 15 to 30 MPa and the volume of the impact sound is 108 to 128 dB (decibel).

The opening area of the gas discharge hole 19 is preferably about 0.5 to ³ cm ² . When the opening area is less than 0.5 cm ² , the tightening pressure in the combustion container 16 tends to increase excessively, and the volume of the impact sound becomes too high. On the other hand, if it exceeds 3 cm ² , the tightening pressure in the combustion container 16 is insufficient, and a desired impact sound cannot be obtained, which is not preferable.

  A female screw hole 27 is provided at the center of the bottom wall 17 of the combustion container 16, and a male screw 28 a of an igniter 28 as an ignition member is screwed into the female screw hole 27. The chain plug 14 is provided with a through hole 14a, through which a lead wire (not shown) connected to the igniter 28 is inserted. A transfer charge 29 constituting an ignition member is disposed in the accommodation space 20 at the front position of the igniter 28. A gas generating agent 30 is loaded in front of the transfer charge 29 in the storage space 20.

  The outer diameter of the combustion container 16 is equal to or smaller than the inner diameter of the chamber 11 of the launcher 10 so that the combustion container 16 can be loaded into the launcher 10, and the length of the combustion container 16 is also within the chamber 11 of the launcher 10. The length that can be loaded is appropriately selected. The outer diameter of the combustion container 16 is preferably 1-2 mm smaller than the inner diameter of the launcher 10 so that it can be smoothly attached to and detached from the launcher 10 and positioned within the launcher 10.

  Further, when designing the outer diameter of the combustion container 16 to be small from the viewpoint of cost and handling, it is preferable to have a structure in which a cylindrical loading guide 31 is provided outside the combustion container 16 as shown in FIG. . That is, the bottom wall 17 of the combustion container 16 is expanded in diameter, and a male screw 17a is formed on the outer peripheral surface thereof. A female screw 31a on the inner peripheral surface of the lower end portion of the loading guide 31 is screwed into and connected to the male screw 17a. The outer diameter of the loading guide 31 is preferably set to be 1 to 2 mm smaller than the inner diameter of the launching device 10 so that it can be smoothly attached to and detached from the launching device 10 and positioned within the launching device 10.

  The length of the combustion container 16 is preferably ½ or less of the length of the chamber 11 of the launching device 10. The reason is to reduce the weight of the combustion container 16 and facilitate loading and unloading of the combustion container 16 from the launching device 10. When the length of the combustion container 16 is designed to be short from the viewpoint of cost and handling, it is preferable to provide the loading guide 31 outside the combustion container 16 as described above, and the length of the loading guide 31 in that case Is preferably ½ or less with respect to the length of the chamber 11 of the launching device 10 in order to facilitate loading and unloading of the combustion container 16 from the launching device 10.

  Although the volume in the combustion container 16 is determined based on the outer diameter and length of the combustion container 16, it is preferable that it is 1/2 or less of the volume of the launcher 10. When the igniter 28 is ignited, the propellant 29 disposed in front of the igniter 28 is ignited, and the entire gas generating agent 30 is combusted by the flame caused by the ignition of the propellant 29. The igniter 28 is preferably a detonator that is ignited by an electrical signal from the outside of the launching device 10 or a blow.

  The charge transfer agent 29 is quickly ignited by ignition of the igniter 28 and propagates a flame to the gas generating agent 30. As for the kind of explosive charge 29, a black powder, a single base-based igniter mainly composed of nitrocellulose, a boron nitrate igniter, or a mixed igniter of magnesium and fluororesin (polytetrafluoroethylene) can be used. However, black explosives and single-base type explosives generally used for ammunition are preferable. A particularly preferable transfer powder 29 is black powder.

  The gas generating agent 30 generates gas in the combustion container 16 by ignition of the charge transfer agent 29. Any gas generation agent 30 can be used as long as it can rapidly generate gas after ignition of the transfer charge 29. Those using explosives such as propellants and propellants are preferred. The gas generating rate of the gas generating agent 30 varies depending on the composition and shape. In addition, the gas generation rate varies greatly depending on the environmental temperature during use. However, since the lid body 21 provided with the gas discharge hole 19 is deformed by the tightening pressure in the combustion container 16 and the area of the gas discharge hole 19 is adjusted, the pressure in the combustion container 16 can be kept constant. The existing composition and shape used can be used, and an almost constant volume of impact sound can be obtained without being greatly affected by temperature change and the amount of gas generating agent.

  The gas generation rate by combustion of the gas generating agent 30 is preferably 15 to 35 mm / sec at 20 MPa at + 21 ° C. When the gas generation speed is slower than 15 mm / second, the volume of the impact sound of the impact sound generator 15 is decreased, and a tendency to generate combustion residue is not preferable. On the other hand, if it is faster than 35 mm / second, the volume of the impact sound becomes excessive and the lid 21 may be damaged, which is not preferable.

  Specifically, the gas generating agent 30 is mainly composed of a single base system mainly composed of nitrocellulose, a double base system mainly composed of nitrocellulose and nitroglycerin, or mainly nitrocellulose, nitroglycerin and nitroguanidine. Then, a triple-based gas generating agent can be used. A composite gas generating agent comprising an oxidizing agent such as ammonium perchlorate, potassium perchlorate, ammonium nitrate, nitramine, and a fuel and binder such as polybutadiene, polyether or polyester can also be used. Among these, the gas generating agent 30 composed of a single base system, a double base system, or a triple base system smokeless explosive is preferable from the viewpoint of generating combustion gas that does not affect the launching device 10 such as corrosion.

  As the shape of the gas generating agent 30, shapes such as a long tube with a groove, a single hole tubular shape, a rod shape, a spherical shape, a plate shape, and a porous tube, which are generally used for the gas generating agent 30, are adopted. In order to ensure stable combustion, a shape in which the combustion area does not change from the start to the end of combustion is preferable. From such a viewpoint, a slotted long tube or a single-hole tube is preferable. Furthermore, it is preferable that the particle diameter of the gas generating agent 30 is larger than the diameter of the gas exhaust hole 19 so that the gas generating agent 30 in the middle of combustion is not released from the gas exhaust hole 19.

  The position of the gas discharge hole 19 is preferably arranged at the center of the lid 21 in order to uniformly disperse the pressure (reaction) applied to the impact sound generator 15 and the launching device 10 as the gas is discharged. The shape of the gas discharge hole 19 and the total opening area thereof are appropriately set according to the gas generation speed generated in the combustion container 16 and the tightening pressure necessary to generate the impact sound. The shape of the gas discharge hole 19 is not particularly limited as long as the opening area of the gas discharge hole 19 is within a predetermined range, but the slit 25 (FIGS. 3 and 5A) extending radially from the center of the lid 21 Etc.). In this case, it is possible to suppress a change in the tightening pressure and the volume of the impact sound due to a change in the environmental temperature, and at the same time, it is possible to uniformly distribute the pressure accompanying the discharge of the combustion gas. The slit 25 is most preferably a cross shape considering the strength and deformation of the lid 21. Further, in order to prevent moisture absorption of the gas generating agent 30, the transfer agent 29, and the igniter 28 in the combustion container 16, a moisture absorption preventing sealing tape such as an aluminum tape can be attached to the gas discharge hole 19. It is.

  When the gas generating agent 30 is in a small granular form, the unburned gas generating agent 30 jumps out from the gas discharge hole 19 and is released to the outside of the launching device 10, so that it is not possible to secure good handling properties in front of the launching device 10. Therefore, it is also possible to arrange a perforated plate for preventing the unburned gas generating agent 30 from jumping out in the accommodation space 20 at the front position of the gas generating agent 30.

  The tightening pressure in the combustion container 16 is mainly determined by a combination of the total opening area of the gas discharge holes 19 and the gas generation speed in the combustion container 16. Note that the total opening area of the gas discharge hole 19 means the total opening area in the planar shape of the lid 21. More specifically, gas is generated in the combustion container 16 at a certain gas generation speed by the combustion of the gas generating agent 30 in the combustion container 16. At the initial stage of combustion when the amount of gas generated in the combustion container 16 is larger than the amount of gas discharged from the gas discharge hole 19, the pressure in the combustion container 16 increases and the gas is tightly closed. On the other hand, in the later stage of combustion where the amount of gas generated in the combustion container 16 becomes smaller than the amount of gas discharged from the gas discharge hole 19, the pressure in the combustion container 16 begins to decrease. The main impact sound is generated when gas is exhausted to the outside of the combustion container 16 while the tightening pressure rapidly decreases after the maximum pressure in the combustion container 16 elapses. In general, the higher the tightening pressure, the greater the noise generated.

  In the present embodiment, the tightening pressure is increased when the gas discharge hole 19 is enlarged due to the increase in the tightening pressure in the combustion container 16 based on the combustion of the gas generating agent 30 in the combustion container 16 and the opening area thereof is increased. Is adjusted to 15 to 30 MPa. By managing the tightening pressure within this range, a sufficient sound can be made to reach the periphery of the impact sound generating device 15, and the destruction of the combustion container 16 due to an abnormal pressure rise can be prevented. When the tightening pressure is higher than 30 MPa, the combustion gas generated in the combustion container 16 is not smoothly discharged from the gas discharge hole 19 and causes an abnormal pressure increase. On the other hand, when the tightening pressure is lower than 15 MPa, the desired sufficient impact sound cannot be generated. The range of the tightening pressure does not mean that all the pressures in the combustion container 16 during combustion are maintained within this range, but the maximum pressure is suppressed within this range.

  In order to prevent the combustion container 16 from being destroyed by the combustion gas generated by the combustion of the gas generating agent 30, in addition to the strength of the bottom wall 17 and the peripheral wall 18 of the combustion container 16 and the strength of the lid body 21, the peripheral wall 18 and the lid The total strength of the bonding strength of the bodies 21 needs to exceed the strength that can withstand the pressure (30 MPa) generated by the combustion gas in the combustion container 16.

  Further, when the temperature in the combustion container 16 is −50 ° C. or more and 0 ° C. or less, the tightening pressure is 15 to 20 MPa, and the temperature in the combustion container 16 exceeds 0 ° C. and is 60 ° C. or less. In some cases, the tightening pressure is 20 to 30 MPa. In this case, the tightening pressure is set in accordance with the case where the inside of the combustion container 16 is at a low temperature and the case where the combustion container 16 is at a high temperature, and the volume of the impact sound can be maintained within a certain range regardless of the temperature. The temperature in the combustion container 16 corresponds to the environmental temperature before the gas generating agent 30 is combusted.

  Further, the difference between the tightening pressure when the temperature inside the combustion container 16 is 51 ° C. and the tightening pressure when the temperature inside the combustion container 16 is −32 ° C. is within 10 MPa, and the temperature inside the combustion container 16 is 51 ° C. The difference between the volume of the impact sound in this case and the volume of the impact sound in the case of −32 ° C. is within 12 dB. With this configuration, it is possible to suppress changes in the tightening pressure and the volume of the impact sound as much as possible with respect to a temperature change in the combustion container 16, that is, a change in the environmental temperature.

  When an impact sound is generated using the impact sound generation device 15, the igniter 28 is first ignited by an electrical signal from the outside of the launching device 10. By the ignition of the igniter 28, the transfer charge 29 located in front of the igniter 28 is ignited, and the gas generating agent 30 is combusted by the flame to generate combustion gas.

  At the initial stage of combustion of the gas generating agent 30, the pressure due to the combustion gas in the combustion container 16 increases and the combustion gas is in a closed state in the combustion container 16, and then the tightening pressure in the combustion container 16 is maximum. Reach pressure. At this time, as the tightening pressure in the combustion container 16 increases, the opening area of the gas discharge hole 19 gradually increases, and the tightening pressure is gradually released. For this reason, the tightening pressure in the combustion container 16 decreases in the later stage of combustion of the gas generating agent 30. In this process, after the tightening pressure in the combustion container 16 has passed the maximum pressure, an impact sound is generated when gas is exhausted from the gas discharge hole 19 to the outside of the combustion container 16 while the tightening pressure rapidly decreases. Occur. As a result, an impact sound of about 108 to 128 dB is obtained from the impact sound generation device 15 at a point 30 m on the side, and a sufficient sound can reach the periphery of the impact sound generation device 15.

The actions and effects exerted by the above embodiment are collectively described below.
The impact sound generator 15 according to the present embodiment is deformed so that the segment 21a forming the gas discharge hole 19 warps outward due to an increase in the tightening pressure in the combustion container 16 based on the combustion of the gas generating agent 30. However (see FIG. 6 (b)), the gas discharge hole 19 is enlarged to increase its opening area, and combustion gas can be easily discharged. For this reason, it can suppress effectively that the cover body 21 receives the increase in the forcing pressure in the combustion container 16, bursts, and the fragment | piece is scattered. Further, since the tightening pressure in the combustion container 16 is adjusted to 15 to 30 MPa regardless of the environmental temperature, the tightening pressure in the combustion container 16 and the volume of the impact sound greatly change due to the change in the environmental temperature. Can be suppressed.

  Therefore, in the impact sound generation device 15, the release of solid matter such as fragments of the lid 21 is effectively suppressed when the impact sound is generated, and the tightening pressure in the combustion container 16 and the volume of the impact sound affect the environmental temperature. The effect that it is hard to be done can be exhibited. Therefore, it is possible to emit a sufficient impact sound even under slow gas generation conditions, and conversely, it is possible to prevent the lid 21 of the combustion container 16 from being destroyed even under a rapid and large amount of gas generation conditions. For this reason, the impact sound generation device 15 can be suitably used for repelling harmful birds and beasts, inducing avalanches, etc., in addition to flying object launch training.

  In addition, when the temperature in the combustion container 16 is −50 ° C. or more and 0 ° C. or less, the tightening pressure is 15 to 20 MPa and the temperature in the combustion container 16 exceeds 0 ° C., and when the temperature is 60 ° C. or less, the tightening is performed. It is comprised so that a pressure may be 20-30 Mpa. For this reason, the tightening pressure in the combustion container 16 is set to an appropriate range depending on whether the temperature in the combustion container 16 is low or high, and the volume of the impact sound is kept constant regardless of the environmental temperature. You can get closer.

  Furthermore, the difference between the tightening pressure when the temperature in the combustion container 16 is 51 ° C. and the tightening pressure when the temperature in the combustion container 16 is −32 ° C. is within 10 MPa, and the temperature in the combustion container 16 is 51 ° C. The difference between the volume of the impact sound and the volume of the impact sound at −32 ° C. is within 12 dB. Therefore, changes in the tightening pressure and the volume of the impact sound can be sufficiently suppressed with respect to changes in the environmental temperature.

  The gas discharge hole 19 is constituted by slits 25 extending radially from the center of the lid 21 so that the opening area of the gas discharge hole 19 can be easily expanded. For this reason, it is possible to easily suppress the change in the tightening pressure and the volume of the impact sound accompanying the change in the environmental temperature, and it is possible to uniformly distribute the pressure accompanying the discharge of the combustion gas.

  The tightening pressure based on the combustion gas in the combustion container 16 while maintaining the strength of the lid body 21 because the lid body 21 is made of an iron-based material and has a thickness of 1 to 5 mm. It is possible to increase the opening area of the gas discharge hole 19 due to the increase in the number of the gas discharge holes 19.

Hereinafter, although the said embodiment is described further more concretely by giving an Example and a comparative example, this invention is not limited to the range of these Examples.
Example 1
As the impact sound generating device 15 of Example 1, a device having the structure shown in FIGS. 5A and 5B was manufactured. FIG. 5A is a plan view showing the lid body 21 provided with the gas discharge holes 19, and FIG. 5B is a cross-sectional view showing the impact sound generator 15.

The bottom wall 17 and the peripheral wall 18 of the combustion container 16 were produced using steel (carbon steel, S25C). The lid 21 of the combustion container 16 is also made of the same material, and the female threaded portion 24 of the lid 21 is screwed to the male threaded portion 22 of the peripheral wall 18 to fix the lid 21 to the peripheral wall 18. The lid body 21 is made of steel with a thickness of 3 mm, and the opening portion of the gas discharge hole 19 starts to increase when the pressure reaches 15 MPa or more at the tip portion, as shown in FIG. A gas discharge hole 19 having a cross-sectional area of 1.57 cm ² was formed. The inner diameter of the peripheral wall 18 of the combustion vessel 16 was about 57 mm, the length was about 160 mm, and the volume of the storage space 20 was about 400 cm ³ . In addition, the circular arc part 26a which forms the gas exhaust hole 19 is formed in circular arc shape so that the center part side of the cover body 21 may become convex.

  As a composition of the gas generating agent 30, a double base gas generating agent mainly composed of nitrocellulose and nitroglycerin was used. The gas generating agent 30 is a single-hole tubular medicine having an outer diameter of about 8.5 mm, an inner diameter of about 2.5 mm, and a length of 100 mm, and the dosage is 170 g. An igniter 28 made of an electric detonator was attached to the bottom wall 17 of the combustion container 16, and a black explosive 10 g was disposed in the vicinity of the igniter 28 as a transfer agent 29 in order to uniformly ignite the gas generating agent 30. And after arrange | positioning the gas generating agent 30 put in the polyethylene bag in the combustion container 16, the cover body 21 was attached. Thereafter, the combustion container 16 was placed in a thermostatic chamber set at + 51 ° C., and the temperature was adjusted for 24 hours.

  After adjusting the temperature for 24 hours, a pressure detector (trade name: Piezo Sensor, manufactured by PCB) 32 was attached to the peripheral wall 18 of the combustion vessel 16. Then, after the impact sound generator 15 is fixed horizontally, the igniter 28 is connected and electrically energized by remote operation, thereby igniting the igniter 28 and igniting the transfer agent 29 to burn the gas generating agent 30. It was. As a result, the combustion gas generated in the combustion container 16 was discharged from the gas discharge hole 19 to generate an impact sound, and at the same time, smoke was generated in front of the impact sound generator 15.

  The volume (dB) of the impact sound was measured by a sound level meter (manufactured by Rion Co., Ltd., product name: NA-27) disposed at a point 30 m from the side of the test apparatus, and the tightening pressure (MPa) was measured by the pressure detector 32. Measured. The volume of the impact sound is a value obtained by measuring with a sound level meter according to JIS Z 1509 and correcting the frequency of the A characteristic with the FAST time constant. The test results are shown in Table 1. It was confirmed that no solid matter was released when the impact sound was generated, the tightening pressure was 25 MPa, and the volume of the impact sound was 125 dB. Moreover, the top view and partial sectional view which show the state of the gas exhaust hole 19 which deform | transformed after the test were shown to Fig.6 (a) and (b), respectively.

  As shown in FIGS. 6 (a) and 6 (b), the four sections 21 a located at the center of the lid 21 that forms the intersecting portion of the slit 25 of the gas discharge hole 19 form the gas generating agent 30 in the housing space 20. Curved outward due to combustion pressure. For this reason, while the area of the intersection part of the slit 25 is expanded, each slit 25 is deform | transformed into the taper shape so that it may be expanded as it goes to an intersection part. The arc portion 26a that forms the gas discharge hole 19 has a larger radius (the radius of the arc is larger) than before the combustion of the gas generating agent 30 (the state of FIG. 5A).

Next, a test was performed when the temperature for adjusting the temperature of the combustion container 16 was set to -32 ° C. The test results are shown in Table 1. As a result of the test, solid matter was not released when the impact sound was generated, the tightening pressure was 18 MPa, and the volume of the impact sound was 115 dB. It was confirmed that the difference between + 51 ° C. and −32 ° C. for the tightening pressure was 7 MPa, and the difference between the + 51 ° C. and −32 ° C. for the volume of the impact sound was 10 dB.
(Example 2)
The lid 21 is made of steel with a thickness of 3 mm, and the gas discharge hole 19 has a width of 2 mm (cross-sectional area: 2.34 cm ² ) in the shape shown in FIGS. 7A and 7B and has six slits 25. Having gas discharge holes 19 extending radially at equal angles. Moreover, the test was implemented using 170g of gas generating agents 30. FIG. The results are shown in Table 1. As a result of the test, solid matter was not released when the impact sound was generated, the difference between the tightening pressure between + 51 ° C. and −32 ° C. was 6 MPa, and the volume of the impact sound between + 51 ° C. and −32 ° C. was 8 dB. I was able to confirm that there was.
(Example 3)
The lid 21 was made of steel having a thickness of 2 mm and the gas discharge hole 19 having a width of 2 mm (cross-sectional area: 1.57 cm ² ) having the shape shown in FIG. Moreover, the test was implemented using 170g of gas generating agents 30. FIG. The results are shown in Table 1. As a result of the test, no solid matter was released when the impact sound was generated, the difference between the tightening pressure between + 51 ° C. and −32 ° C. was 6 MPa, and the volume of the impact sound between + 51 ° C. and −32 ° C. was 9 dB. I was able to confirm that there was.
Example 4
The lid 21 is made of steel having a thickness of 3 mm, and the gas discharge hole 19 is formed to have a width of 2 mm (cross-sectional area: 1.57 cm ² ) having the shape shown in FIG. Was sealed with an aluminum tape. Moreover, the test was implemented using 170g of gas generating agents 30. FIG. The results are shown in Table 1. As a result of the test, solid matter was not released when the impact sound was generated, the difference between the tightening pressure between + 51 ° C. and −32 ° C. was 7 MPa, and the volume of the impact sound between + 51 ° C. and −32 ° C. was 10 dB. I was able to confirm that there was.
(Example 5)
The lid 21 is made of steel having a thickness of 3 mm, and the gas discharge hole 19 has the gas discharge hole 19 having a width of 1 mm (cross-sectional area: 0.80 cm ² ) having the shape shown in FIG. . Moreover, the test was implemented using 170g of gas generating agents 30. FIG. The results are shown in Table 1. As a result of the test, solid matter was not released when the impact sound was generated, the difference between the tightening pressure of + 51 ° C. and −32 ° C. was 9 MPa, and the volume of the impact sound between + 51 ° C. and −32 ° C. was 10 dB. I was able to confirm that there was.
(Comparative Example 1)
As shown in FIGS. 8A and 8B, the test was performed using the lid body 21 that has the cut groove 33 that does not penetrate and does not have the gas discharge hole 19. Moreover, the test was performed using 170 g of the gas generating agent 30. The results are shown in Table 1. As a result of the test at + 51 ° C., solid matter was not released when the impact sound was generated, but the tightening pressure became 46 MPa, and a part of the joint portion between the lid body 21 and the peripheral wall 18 was broken, which would be a practical problem. There was found. Regarding the tightening pressure, the difference between + 51 ° C. and −32 ° C. is 29 MPa, and for the volume of the impact sound, the difference between + 51 ° C. and −32 ° C. is 15 dB. It was.
(Comparative Example 2)
As shown in FIGS. 8A and 8B, the test was performed using the lid body 21 that has the cut groove 33 that does not penetrate and does not have the gas discharge hole 19. Further, the test was performed using 100 g of the gas generating agent 30. The results are shown in Table 1. As a result of the test at −32 ° C., it was found that the tightening pressure was as low as 12 MPa and the lid 21 was not open. For this reason, the volume of the impact sound was as extremely low as 65 dB. Regarding the tightening pressure, the difference between + 51 ° C. and −32 ° C. is 12 MPa, and for the volume of the impact sound, the difference between + 51 ° C. and −32 ° C. is 55 dB. It was.

表１に示した結果より、実施例１〜５においては、燃焼容器１６内の緊塞圧力が１５〜２９ＭＰａで衝撃音の音量が１１２〜１２７ｄＢであり、衝撃音発生装置１５の側方３０ｍ地点での音は十分に大きく、その音を認識するのに十分であった。また、緊塞圧力の最大値は２９ＭＰａであり、燃焼容器１６が破壊されるような問題は生じなかった。以上の結果より、衝撃音発生装置１５は、高温と低温との性能変化が非常に小さいものであり、従って環境温度に影響されないものであることを確認することができた。

From the results shown in Table 1, in Examples 1 to 5, the tightening pressure in the combustion container 16 is 15 to 29 MPa, the impact sound volume is 112 to 127 dB, and the point 30 m on the side of the impact sound generator 15 is located. The sound at was loud enough to recognize the sound. Further, the maximum value of the tightening pressure was 29 MPa, and there was no problem that the combustion container 16 was destroyed. From the above results, it was confirmed that the impact sound generator 15 has a very small change in performance between the high temperature and the low temperature, and therefore is not affected by the environmental temperature.

  On the other hand, in Comparative Example 1, there is a problem that a part of the coupling portion between the lid 21 and the peripheral wall 18 is broken during the + 51 ° C. test. In Comparative Example 2, the side 30 m of the impact sound generator 15 is broken. There was a problem that the sound at the point could not be fully recognized. Therefore, in the comparative example, the performance change between the high temperature and the low temperature is large, and it is remarkably influenced by the environmental temperature, so that it can be confirmed that it is difficult to use as the impact sound generator 15.

It should be noted that the above embodiment can be modified as follows.
The thickness of the central portion of the lid body 21 may be made thinner than the thickness of the outer peripheral portion, and the central portion of the lid body 21 may be easily deformed by increasing the tightening pressure in the combustion container 16. it can. In this case, the lid 21 can be formed in a stepped shape or a tapered shape so that the thickness of the lid 21 becomes thinner toward the center.

  The slit 25 provided in the lid 21 is formed so that the center side of the lid 21 is wider than the outer peripheral side, and the slit 21 is formed by increasing the tightening pressure in the combustion container 16. It is also possible to configure so that the deformation of the central portion of each of them becomes easy.

It is also possible to reinforce by forming a thick portion of the lid 21 where the gas discharge hole 19 is not provided, or by reinforcing a rib.
-Set the difference in tightening pressure due to temperature and the difference in volume of impact sound due to temperature, such as setting the low temperature side to -30 ° C, the high temperature side to + 50 ° C, etc. You can do it.

  The number of slits 25 extending radially from the center of the lid 21 can be set to 8, 10, etc., and the width of the slits 25 can be set appropriately wide or narrow.

The launching device 10 including the impact sound generation device 15 can be used by being arranged in an oblique direction of a predetermined angle instead of vertical or horizontal.
Furthermore, the technical idea grasped from the embodiment will be described below.

  The structure according to any one of claims 1 to 5, wherein the opening area of the gas discharge hole starts to increase when the tightening pressure in the combustion container reaches 15 MPa. The impact sound generator described. When comprised in this way, the effect of the invention concerning any one of Claims 1-5 can be exhibited effectively.

  The impact sound generator according to claim 4 or 5, wherein the gas discharge hole has a plurality of slits formed at equal intervals. When comprised in this way, gas can be discharged | emitted equally and the effect of the invention which concerns on Claim 4 or Claim 5 can be exhibited in the stable state.

  The impact sound generator according to claim 4 or 5, wherein the slit is formed in a cross shape. When constituted in this way, in addition to the effect of the invention according to claim 4 or claim 5, the structure of the gas discharge hole can be simplified.

  The impact sound according to claim 4 or 5, wherein the section of the lid forming the slit is configured to be deformed outward when the tightening pressure reaches 15 MPa. Generator. When comprised in this way, the tightening pressure in a combustion container can be open | released easily, and the effect of the invention which concerns on Claim 4 or Claim 5 can be exhibited effectively.

  The impact sound generator according to claim 5, wherein the iron-based material is carbon steel or stainless steel. When comprised in this way, the effect of the invention which concerns on Claim 5 can be exhibited effectively.

The schematic sectional drawing which shows typically the launching apparatus provided with the impact sound generator in embodiment. 1 is a schematic cross-sectional view schematically showing an impact sound generator. The schematic perspective view which shows an impact sound generator typically. The schematic sectional drawing which shows typically the launching apparatus provided with the impact sound generator accommodated in the loading guide. (A) is a side view which shows the impact sound generator in Example 1, (b) is a schematic sectional drawing which shows an impact sound generator. (A) is a side view which shows the impact sound generator after a gas generating agent burns, (b) is a schematic fragmentary sectional view which shows the impact sound generator. (A) is a side view which shows the impact sound generator in Example 2, (b) is a schematic sectional drawing which shows the impact sound generator. The conventional impact sound generator is shown, (a) is a side view showing the impact sound generator in Comparative Examples 1 and 2, and (b) is a schematic sectional view showing the impact sound generator.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 15 ... Impact sound generator, 16 ... Combustion container, 17 ... Bottom wall, 18 ... Perimeter wall, 19 ... Gas discharge hole, 21 ... Cover body, 25 ... Slit which comprises gas discharge hole, 28 ... Ignition tool as ignition member , 29: A charge transfer agent as an ignition member, 30: A gas generating agent.

Claims (5)

A combustion vessel is constituted by a bottom wall, a cylindrical peripheral wall standing upright from the periphery of the bottom wall, and a plate-like lid body attached to the front end of the peripheral wall and provided with a gas discharge hole. In the impact sound generating device provided with an ignition member for burning the gas generating agent in the bottom wall while containing the gas generating agent in the container,
By increasing the tightening pressure in the combustion container based on the combustion of the gas generating agent in the combustion container, the gas discharge hole is enlarged to increase the opening area, and the tightening pressure is adjusted to 15 to 30 MPa. Composed of
The gas discharge hole is constituted by a plurality of intersecting slits having openings,
The緊塞pressure impact sound generating device according to claim Rukoto is adjusted by a slit having the opening. When the temperature in the combustion container is −50 ° C. or more and 0 ° C. or less, the tightening pressure is 15 to 20 MPa and the temperature in the combustion container exceeds 0 ° C., and when the temperature is 60 ° C. or less, the tightening pressure is 20 to 20 ° C. It is comprised so that it may become 30 Mpa, The impact sound generator of Claim 1 characterized by the above-mentioned. The volume of impact sound when the difference between the tightening pressure when the temperature inside the combustion container is 51 ° C. and the tightening pressure when the temperature inside the combustion container is −32 ° C. is within 10 MPa and the temperature inside the combustion container is 51 ° C. 3. The impact sound generating device according to claim 1, wherein a difference between the sound volume of the impact sound at −32 ° C. is within 12 dB. 4. 4. The gas discharge hole according to claim 1, wherein the gas discharge hole has an opening area of 0.5 to ³ cm ² and is configured by slits extending radially from a central portion of the lid. The impact sound generator described in 1. The impact sound generator according to any one of claims 1 to 4, wherein the lid is made of an iron-based material and has a thickness of 1 to 5 mm.

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