JP5207528B2 - Ignition device for rocket motor - Google Patents

Description

  The present invention relates to a rocket motor ignition device for igniting a rocket motor.

  Conventionally, as a pyrotechnic igniter, a main charge to be output to a solid propellant of a rocket motor, a power supply, a lead wire having one end connected to the power supply, and other than the lead wire embedded in the main charge. Some have a squib connected to the end.

  In the above conventional ignition device, the main charge is ignited by supplying power to the squib via the lead wire and igniting it, thereby igniting the solid propellant of the rocket motor. In the relationship of supplying power to the squib through the wire, if a stray current caused by static electricity, lightning, strong electromagnetic waves, etc. flows, the possibility that the main charge will ignite completely is denied. Can not do it.

In order to cope with such a problem, a pyrotechnic ignition device having a configuration described in Patent Document 1 has been proposed.
The ignition device for pyrotechnics described in Patent Document 1 ignites a terminal pyrotechnic through a detonation line, and a detonation means for detonating one end of the detonation line by striking, and a detonation line Open / close means for opening and closing between one end of the lead and the initiation means, and the other end of the explosive wire is connected to the input portion of the terminal pyrotechnic.
Japanese Patent Laid-Open No. 3-12086

However, in the ignition device described in Patent Document 1, the explosive wire has a structure in which a heart medicine made of explosive is coated. In other words, since it has a solid structure, this is an obstacle to reducing the weight of the ignition device.
Furthermore, when the explosive explosive is propagated while detonating, it generates heat, pressure, and debris around it, so it is necessary to protect the surrounding equipment by some means so as not to be affected by these effects.

  Therefore, the present invention aims to provide an ignition device for a rocket motor that can reduce the weight of the main charge after eliminating the concern that the main charge may ignite under the influence of static electricity, lightning, or strong electromagnetic waves. Yes.

Rocket motor ignition device for solving the above problems is the rocket motor ignition device for igniting the rocket motor using cylindrical solid propellant having a hole which is open at both end faces, magnesium poly The main charge consisting of tetrafluoroethylene can be ignited , and the ignition charge consisting of boron nitrate is arranged, and one end of a non-nel tube for transmitting detonation waves is connected to the ignition charge, and A non-electric ignition means is connected to the other end of the non-nel tube.

  In the above configuration, when the non-nel tube is ignited by non-electric ignition means, the explosive (for example, HMX and aluminum) applied to the inner wall of the synthetic resin tube main body of the non-nel tube diffuses in the tube and is supersonic. This detonation occurs, this detonation is transmitted to the igniting agent, and this igniting agent and the main charge are sequentially ignited.

  At this time, since an electric ignition system is not adopted, there is no possibility that the main charge will be ignited by static electricity, lightning, or strong electromagnetic waves. Since the tube has a hollow structure formed by applying an explosive to the inner wall of the synthetic resin tube body, the weight of the ignition device can be reduced. In addition, the non-nell tube does not generate heat or pressure from the inside to the outside of the synthetic resin tube except for the end face, and no debris, even when the internal explosive is initiated.

  According to the present invention, it is possible to reduce the weight and reduce the adverse effects on the surroundings while eliminating the concern that the main charge is ignited under the influence of static electricity, lightning or strong electromagnetic waves.

  The best mode for carrying out the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional view illustrating a schematic configuration of a gas generator that is a pyrotechnic to which an ignition device according to an embodiment of the present invention is applied. In this embodiment, a rocket motor will be described as a gas generator.

  A rocket motor A according to an example has a structure in which an internal combustion type solid propellant 3 is loaded in a motor case 1 and an ignition device 10 according to an embodiment of the present invention is disposed.

The motor case 1 is formed by forming an end wall 1a on one end surface of a body portion 1b formed in a cylindrical shape and an end wall 1c in which the nozzle 2 is integrally formed on the other end surface so as to coincide with the axis O. is there.
A nozzle closure 4 formed so as to be along the inner surface is fitted to the inner surface of the nozzle 2.

  The solid propellant 3 is formed over the entire length loaded over the end wall 1c, leaving a required space α on the end wall 1a side of the main body 1b, and is aligned with the axis O and has a cylindrical hole 3a. It is a cylindrical shape formed.

  The ignition device 10 includes a main charge 11, an ignition charge 14, a non-nel tube 13, and a non-electric ignition means 12.

The main charge 11 is obtained by loading a chemical such as magnesium / polytetrafluoroethylene into a resin case 15, and is arranged on the one end face 3 b of the solid propellant 3 so as to coincide with the axis O.
The main charge 11 has an igniter 14 embedded in one end of a nonnel tube 13 described below.

  The igniting agent 14 is made of boron nitrate and is loaded in a container 16 that can withstand detonation (high-pressure heat output) transmitted through the nonnel tube 13.

The non-nel tube 13 transmits detonation waves and has a hollow structure in which explosives (HMX and aluminum) are applied to the inner wall surface of the synthetic resin tube body 13a.
The non-nel tube 13 has one end 13b connected to the igniting agent 14 and the other end 13c extending through the hole 3a of the solid propellant 3 to the outside of the other end surface 3c. It is formed over the entire length connected to the ignition means 12 located on the rocket launcher (not shown) side outside the case 1.
Further, the non-nel tube 13 described above is arranged so as to coincide with the axis O, so that it is arranged at the center of the nozzle closure 4 and the hole 3 a of the solid propellant 3.

  The ignition means 12 is a non-electric type, and the other end 13c of the non-nel tube 13 is connected to this.

  That is, in the ignition device 10 described above, the main charge 11 in which the ignition charge 14 is embedded is disposed on the one end face 3b side of the solid propellant 3, and the nonnel tube 13 for transmitting detonation waves is also provided. A non-electric type is connected to the other end portion 13c of the non-nell tube 13 which is connected to the igniting agent 14 at one end portion 13b and extends to the outside of the other end surface 3c through the hole 3a of the solid propellant 3. The ignition means 12 is connected.

Next, the ignition operation of the rocket motor A having the above structure will be described.
In the ignition device 10 of the rocket motor A described above, when the nonnel tube 13 is ignited by the ignition means 12, the explosive applied to the inner wall of the synthetic resin tube main body 13a of the nonnel tube 13 diffuses in the tube and is supersonic. This detonation is transmitted to the igniting agent 14, and the igniting agent 14 and the main charge 11 are sequentially ignited, and thereby, to the hole 3a of the solid propellant 3 of the rocket motor R. Can be ignited.

  At this time, since the ignition device 10 does not use an electrical ignition system, there is no risk of an unexpected situation in which the main charge 11 is ignited under the influence of static electricity, lightning or strong electromagnetic waves. It becomes.

Further, since the non-nel tube 13 has a hollow structure in which the explosive is applied to the inner wall of the synthetic resin tube main body 13a as described above, the weight of the ignition device is also reduced.
Furthermore, since the nonnel tube 13 does not generate heat, pressure, or fragments to the outside, there is no adverse effect on the propellant 3, the nozzle closure 4 and the rocket launcher (not shown).

  Next, a separation nut which is a pyrotechnic product to which the ignition device according to an embodiment of the present invention is applied will be described. FIG. 2 is a schematic cross-sectional view showing a screwed state of a separation nut according to an example, and FIG. 3 is a schematic cross-sectional view showing a divided state of the separation nut according to the example. In addition, about the thing equivalent to what was demonstrated in embodiment mentioned above, the code | symbol same as them is attached | subjected and detailed description is abbreviate | omitted.

  The separation nut B according to an example includes the piston 50 that holds the split nut 20 in a restraint manner and slides so as to release the restraint of the split nut 20 in the main body 30 and is embedded in the main charge 11. One end portion 13b of the non-nel tube 13 to which the igniting agent 14 is connected is disposed in the main body 30 so as to face the piston 50 so that the piston 50 slides.

The split nut 20 can be divided into about three or four nut pieces 21... So as to be screwed into a bolt 41 formed at the end of the shaft 40 disposed on the external structure P. It has become.
The main body 30 is formed in a cylindrical shape with one end half 30a having a small diameter and the other end half 30b having a large diameter.

In the main body 30, a nut-constrained holding space 31 for fitting the split nut 20, a piston housing space 32, and a lid mounting space in which the ignition device 10 is mounted from one end 30 c to the other end 30 d. The portions 33 are formed so as to communicate with each other sequentially.
The nut restraint holding hollow portion 31 is formed so as to fit the split nut 20. By fitting the split nut 20 into the nut restraint holding hollow portion 31, the nut nut 20 is screwed to the bolt 41. The state is kept.

The piston housing space 32 houses the piston 50 slidably along the central axis O.
The piston 50 is formed by integrally forming a contact portion 52 having a smaller diameter than the flange portion 51 in which the O-ring 60 is wound and fitted along the outer periphery.
Then, the split nut 20 is moved out of the nut fitting empty portion 31 from a separated position (a) (see FIG. 2) separated from the split nut 20 screwing the piston 50 into the nut fitting empty portion 31. The length L1 is set so as to be moved to the extrusion position (A) to be extruded (see FIG. 3).

The lid mounting hollow portion 33 has a female threaded portion 33a threaded on the inner wall surface thereof, and is mounted by screwing the lid 70 into the female threaded portion 33a.
The lid body 70 is formed by integrally forming a cylindrical male screw portion 72 on a circular flange portion 71 having the same outer diameter as the other end half portion 30 b of the main body 30.

An insertion hole 71a through which the nonnel tube 13 is inserted is formed in the collar portion 71 so as to coincide with the central axis O, and the igniting agent 14 is inserted into one end portion 13b of the nonnel tube 13 inserted through the insertion hole 71a. In addition, non-electric ignition means 12 is connected to the other end portion 13c of the non-nel tube 13, respectively.
In the present embodiment, the igniting agent 14 connected to the one end 13 b of the non-nel tube 13 is located in the male screw portion 72. Reference numeral 61 denotes an O-ring for maintaining the airtightness between the lid 70 and the lid screwing hollow portion 33.

Next, the ignition operation of the separation nut B having the above structure will be described.
In the ignition device 10 of the separation nut B described above, when the non-nel tube 13 is ignited by the igniting means 12, the explosive applied to the inner wall of the synthetic resin tube main body 13a of the non-nel tube 13 diffuses in the tube and is supersonic. This detonation occurs, and this detonation is transmitted to the igniting agent 14 so that the igniting agent 14 and the main charge 11 are sequentially ignited, whereby the main charge 11 can be ignited.

By ignition of the main charge 11, high-pressure gas is generated in the lid screwing empty portion 33 and the piston housing empty portion 32, and the high-pressure gas causes the piston 50 to move from the initial position (A) to the pushing position (I). Moving.
As a reaction of the movement of the piston 50, when the main body 30 moves in the α2 direction and the piston 50 moves to the pushing position (A), the engagement restrained state of the split nut 20 is released, and the split nut 20 and the bolt 41 are released. The screwed state is released. Further, when the piston 50 moves to the pushing position (A), the flange portion 51 is positioned in contact with the partition wall 34 that divides the piston housing empty portion 32 and the nut fitting empty portion 31.

At this time, since the ignition device 10 does not use an electrical ignition system, it is possible to prevent an unexpected situation in which the main charge 11 is ignited under the influence of static electricity, lightning, or strong electromagnetic waves.
Further, since the non-nel tube 13 has a hollow structure formed by applying explosive to the inner wall of the synthetic resin tube main body 13a as described above, the weight of the ignition device is reduced, and accordingly, the weight of the separation nut B itself is reduced. Can also be achieved.

It is sectional drawing which shows schematic structure of the gas generator to which the ignition device which concerns on one Embodiment of this invention is applied. It is a schematic sectional drawing which shows the combined state of the separation nut which concerns on an example. It is a schematic sectional drawing which shows the isolation | separation state of the separation nut which concerns on an example same as the above.

Explanation of symbols

DESCRIPTION OF SYMBOLS 3 Solid propellant 3a Hole part 3b One end surface 3c of a solid propellant Other end face 10 of a solid propellant 10 Ignition device 11 Main charge 12 Ignition means 13 Nonnel tube 13b Nonnel tube one end 13c Nonnel tube other end 14 Ignition 20 Split nut 30 Body 50 Piston A Rocket motor B as pyrotechnics Separation nut as pyrotechnics

Claims (2)

In a rocket motor ignition device for igniting a rocket motor using a cylindrical solid propellant having holes opened at both end faces ,
In addition to igniting the main charge consisting of magnesium and polytetrafluoroethylene , the ignition charge consisting of boron nitrate is arranged,
A rocket characterized in that one end portion of a non-nel tube for transmitting detonation waves is connected to the igniting agent, and a non-electric ignition means is connected to the other end portion of the non-nel tube. Ignition device for motor.   The nonnel tube is inserted through the hole of the solid propellant, and one end of the nonnel tube is extended outward from one end surface of the solid propellant, and the other end of the nonnel tube is The ignition device for a rocket motor according to claim 1, wherein the ignition device extends outward from the other end surface of the solid propellant.

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