JP2005155968A - Two stage type explosive ignitor, and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To realize reduction of input energy in a two stage type explosive ignitor. <P>SOLUTION: A second stage explosive 14 is filled in a case 10 having a top part 11, and a ring like spacer 15 is inserted to hold the second stage explosive by holding down a circumference. An explosive holder 18 is inserted so as to hold the spacer between it and the second stage explosive. The explosive holder is filled with a first stage explosive 20 in a center hole, and a flyer 21 is provided adjacent to the first stage explosive and fixed thereon. The flyer is arranged in a movement space 16 in the spacer. An ignition element 22 is put in an outer side of the first stage explosive, an electric connection terminal 23 of the ignition element is drawn outside, and an inlet of the case is sealed by an insulator 24. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a two-stage explosive ignition device that activates an ignition element to ignite a first-stage explosive and then receives the energy to ignite a second-stage explosive. For example, the present invention relates to an automobile safety device for inflating an air bag and an electric explosive ignition device for an initiation mechanism used for military use. The present invention also relates to a method for manufacturing the two-stage explosive ignition device.

  Conventionally, as explosive igniters for detonation mechanisms used for safety devices mounted on automobiles, military weapons, etc., highly explosive igniters using primary explosives (prime explosives) have been the mainstream, but other primary explosives are used There is an explosive ignition device that uses only secondary explosives (sakuyaku) without using it, lowering the sensitivity and increasing safety in handling.

  The former explosive ignition device detonates the primary explosive by heat or spark. On the other hand, the latter explosive ignition device heats, melts and finally evaporates by passing an overcurrent through a low resistance layer, which is a resistor, and lowers it by the energy of the high pressure gas generated at that time. The thin film formed on the surface of the resistance layer is accelerated in the direction of the secondary explosive, collides with the secondary explosive, and explodes the secondary explosive with its kinetic energy. Here, this accelerating thin film is called a flyer.

  In the latter explosive igniter, the low-sensitivity secondary explosive is directly detonated by the kinetic energy of the flyer, but in order to explode the low-sensitivity explosive directly, the pressure is several tens of MPa to hundreds. It is necessary to collide the flyer with the secondary explosive with a force of 10 MPa.

  One of the variables that determine the kinetic energy of a flyer is the speed of the flyer. The speed of the flyer depends on the volume of the low-resistance layer that evaporates and the vapor pressure, but the volume of the low-resistance layer that evaporates is the volume of the low-resistance layer (the product of the surface area of the low-resistance layer and the thickness of the low-resistance layer) Besides, it also depends on the electrical energy applied to the low resistance layer to heat it. In other words, the greater the electrical energy applied to the low resistance layer, the greater the amount of heat generated by the low resistance layer, and consequently the volume of the low resistance layer that evaporates increases.

  If the volume of the low-resistance layer that evaporates increases, the high-pressure gas generated there also increases, and as a result, the energy given to the flyer also increases. In order to give the flyer a force that generates a pressure of several tens of MPa to several hundreds of MPa, it is necessary to apply electric energy of 1 J or more to the low resistance layer, and in order to obtain such electric energy. It is necessary to charge the capacitor with a voltage of several kV. For example, the explosive igniter described in the paper "Two Novel Monolithic Substrate Slapper Detonators" by John H. Henderson and Thomas A. Baginski et al. The capacitor is charged with a voltage of 1 kV, and 1 J of electrical energy is supplied.

  In such an explosive ignition device, it is possible to reduce input energy (electric energy) by reviewing the material and structure of the low resistance layer and its surroundings, and reviewing the material and shape of the flyer.

JP, 2000-28298, A For example, in a semiconductor ignition device given in patent documents 1 etc., the lower part of a low resistance layer is made into an insulating layer, a porous film, and a hollow layer, and is thermally insulated, and heat conduction from a low resistance layer To prevent this. However, even with such an explosive ignition device, heat radiation into the atmospheric pressure above the low resistance layer is inevitable, and there is a limit to further reducing the input energy.

In the ignition device for a titanium semiconductor bridge described in JP-A-2001-241896, the low resistance layer is formed by combining a material having a negative electrical conductivity coefficient (for example, silicon) and titanium. However, because the melting point of titanium is much lower than the vaporization temperature of silicon, silicon does not prevent the generation of plasma formed by vaporization of titanium, and titanium does not interact with oxygen and / or nitrogen in the atmosphere. The purpose is to reduce the input energy by utilizing oxidation to an exothermic reaction. However, even with such an igniter, there is a limit to further reducing the input energy unless a new material is developed at an enormous development cost.

  Among conventional explosive ignition devices, there is also a two-stage type as shown in FIG. In this type of explosive ignition device, a second-stage explosive 2 is filled in a case 1 having a top, and then an explosive holder 4 for holding the first-stage explosive 3 is inserted, and the outside of the first-stage explosive 3 is ignited. After the element 5 was inserted, the electrical connection terminal 6 of the ignition element 5 was pulled out to seal the inlet side of the case 1 with an insulator 7.

  Then, 1 J of electrical energy (charged with a voltage of 1 kV is charged to the capacitor) is applied to the ignition element 5 through the electrical connection terminal 6, and the ignition element 5 is activated to explode the first stage explosive 3, and then the energy is supplied. In response, the second explosive 2 was exploding. Here, when an electric energy of 0.7 J (a voltage of 0.8 kV is charged to the capacitor) is applied to the ignition element 5, the ignition element 5 is operated to detonate the first explosive 3 and subsequently receive the energy. The second explosive 2 reacted, but did not detonate, only deflagration.

  As described above, the conventional ignition devices described in Patent Document 1 and Patent Document 2 have a limit in further reducing input energy. Further, the conventional ignition device shown in FIG. 7 has a problem that it cannot explode the second stage explosive 2 with electric energy of 0.7 J and requires electric energy of 1 J or more.

  Therefore, an object of the present invention is to realize a reduction in input energy, particularly in a two-stage explosive ignition device.

  In order to achieve such an object, in the first aspect of the present invention, a two-stage explosive ignition device that activates an ignition element to ignite a first-stage explosive and then receives the energy to ignite a second-stage explosive. The first stage explosive detonates and accelerates in the direction of the second stage explosive to collide with the second stage explosive, and the detonation energy of the first stage explosive And a flyer for detonating the second stage explosive.

  When the ignition element is activated, it detonates without detonating the first explosive, receives the deflagration energy, accelerates the flyer in the direction of the second explosive, and collides with the second explosive. Detonate the second explosive.

  As the ignition element, a thin film resistor element or a semiconductor bridge element may be used.

  A spacer having a motion space that is the movement area of the flyer is provided between the first-stage explosive and the second-stage explosive, and the flyer is preferably arranged in the movement space, and the flyer is integrated into the spacer using the same material. It is good to form. Moreover, it is good to form integrally the explosive holder which hold | maintains a 1st step explosive in the spacer using the same material.

  In the method for manufacturing a two-stage explosive ignition device according to the second aspect of the present invention, the explosive of the second stage is filled in a case having a top portion, and then the explosive holder is inserted through the spacer to move the space of the spacer. The flyer placed inside is provided adjacent to the first-stage explosive held by the explosive holder, and after placing the ignition element outside the first-stage explosive, the electrical connection terminal of the ignition element is pulled out to the outside The entrance of the case is sealed with an insulator.

  According to the first aspect of the present invention, in the two-stage explosive ignition device that operates the ignition element to ignite the first-stage explosive and then receives the energy to ignite the second-stage explosive, the ignition element When it is activated, it detonates without detonating the first stage explosive, receives the deflagration energy, accelerates the flyer, collides with the second stage explosive, and detonates the second stage explosive, so input By reducing the energy (electric energy) to a deflagration level that does not reach the detonation level, it is possible to reduce the input energy.

  According to the second aspect of the present invention, since the thin film resistor element is used as the ignition element, the low-sensitivity explosive can be detonated reliably.

  According to the invention described in claim 3, since the semiconductor bridge element is used as the ignition element, the low-sensitivity explosive can be detonated reliably.

  According to the invention described in claim 4, since the spacer having the motion space which is the motion area of the flyer is provided between the first-stage explosive and the second-stage explosive, and the flyer is disposed in the motion space. The shock wave generated when the first stage explosive detonates can be transmitted to the flyer in a high density state through the motion space, and finally transmitted to the second stage explosive through the flyer.

  According to the invention described in claim 5, since the flyer is integrally formed on the spacer using the same material, the position of the flyer can be reliably fixed, and the number of parts can be reduced by eliminating the flyer as an independent part. It can be reduced and the assembly can be simplified.

  According to the invention of claim 6, since the explosive holder that holds the first stage explosive is integrally formed on the spacer using the same material, the explosive holder as an independent part is eliminated, and the number of parts is reduced. Assembly can be simplified.

  According to the seventh aspect of the present invention, the second stage explosive is placed in the case having the top, and then the explosive holder is inserted through the spacer and the flyer disposed in the movement space of the spacer is used with the explosive holder. Installed next to the first-stage explosive to be held, put the ignition element outside the first-stage explosive, pull out the electrical connection terminal of the ignition element to the outside, and seal the case entrance with an insulator. Since the stepped explosive ignition device is manufactured, it is possible to reliably and easily obtain a two-step explosive ignition device that reduces the input energy by setting the input energy (electric energy) to a detonation level that does not reach the detonation level.

The best mode for carrying out the present invention will be described below with reference to the drawings.
FIG. 1 shows a longitudinal section of a two-stage explosive ignition device according to the present invention.

  Reference numeral 10 in the figure is a cylindrical case having a top 11 made of, for example, stainless steel. The case 10 is first filled with the second explosive 14 from the bottom inlet 12. As the second explosive 14, the sensitivity is low, such as MIL-E-82903 HNS-IV (hexanitrostilbene-type IV) and MIL-E-14970 comp-A5 (composition-A5). Use explosives that are used as secondary explosives. Here, HNS-IV is used.

  Next, a ring-shaped spacer 15 is inserted and pressed around the second explosive 14 to hold the second explosive 14. The spacer 15 has a motion space 16 that is a motion region of a flyer 21 to be described later.

  Next, the explosive holder 18 is inserted through the spacer 15. The explosive holder 18 is filled with the first stage explosive 20 in the center hole. The first stage explosive 20 is provided with a fryer 21 adjoining it with an ultraviolet curable resin. A flyer 21 fixed on the explosive holder 18 is disposed in the motion space 16 of the spacer 15.

  The explosive holder 18 may be formed of a material having robustness that does not cause a large deformation or disappearance due to an impact when the first explosive 20 burns, and is made of ceramics here.

  As the first explosive 20, explosives such as HNS-IV and comp-A5, which have low sensitivity and are normally used as secondary explosives, are used. Here, the same HNS-IV as the second explosive 14 is used.

  The flyer 21 may be formed of a material having robustness that does not cause a large deformation or disappearance due to an impact when the first stage explosive 20 burns in order to guarantee a reliable explosion of the second stage explosive 14. The shape is arbitrary, but a circular steel plate is used here.

  Thereafter, the ignition element 22 is inserted into the outer surface of the first stage explosive 20 in surface contact therewith. As the ignition element 22, a thin film resistor element (EFI), a semiconductor bridge element (SCB), or the like is used. And from the ignition element 22, the electrical connection terminal 23 electrically connected with the drive circuit not shown is extended. Here, a pair of conductive pins are used as the electrical connection terminals 23.

  Then, the electrical connection terminal 23 is pulled out, and the inlet 12 of the case 10 is hermetically treated with an insulator 24 such as glass or ceramics and sealed.

  The two-stage explosive ignition device according to the present invention is configured as described above, for example. During use, 0.7 J input energy (0.8 kV voltage is charged to the capacitor) is applied to the ignition element 22 by a drive circuit (not shown), and when the ignition element 22 is activated, the first explosive 20 is removed. It detonates without detonation, receives the detonation energy, accelerates the flyer 21 in the direction of the second explosive 14 through the movement space 16, collides with the second explosive 14 and collides with the second explosive 14. Let's detonate.

  In this way, in the two-stage explosive ignition device that activates the ignition element 22 to ignite the first-stage explosive 20 and then receives the energy to ignite the second-stage explosive 14, In response to the deflagration energy at the time of deflagration, the flyer 21 is accelerated to collide with the second explosive 14 and explode the second explosive 14, so that the input energy (electric energy) is at a level to explode. With no deflagration level, a reduction in input energy can be realized.

  Since a thin film resistor element or a semiconductor bridge element is used as the ignition element 22, the low-sensitivity explosive can be detonated reliably. Further, since the spacer 15 having the motion space 16 that is the motion region of the flyer 21 is provided between the first-stage explosive 20 and the second-stage explosive 14, and the flyer 21 is disposed in the motion space 16, the first step. A shock wave generated when the eye explosive 20 detonates can be transmitted to the flyer 21 in a high density state through the motion space 16, and finally transmitted to the second explosive 14 via the flyer 21.

  FIG. 2 shows a longitudinal section of another example of the two-stage explosive ignition device according to the present invention.

  In the example shown in FIG. 2, instead of the ring-shaped spacer 15 used in the two-stage explosive ignition device shown in FIG. 1, a disc spacer 15 between the first-stage explosive 20 and the second-stage explosive 14. Is provided. The penetrating center hole of the disk 15 is used as a motion space 16 that is a motion region of the flyer 21, and the flyer 21 is disposed in the motion space 16 on the first explosive 20. Others are the same as those of the two-stage explosive ignition device shown in FIG. 1, and the reference numerals used for the corresponding parts in the example of FIG.

  In use, similarly, an input energy of 0.7 J (charged to a capacitor with a voltage of 0.8 kV) is applied to the ignition element 22 by a drive circuit (not shown), and the ignition element 22 is operated to operate the first stage explosive. 20 is detonated without detonating, receives the detonation energy, accelerates the flyer 21 through the movement space 16 in the direction of the second explosive 14, and collides with the second explosive 14 to cause the second explosive 14 to collide. Explode explosive 14.

  Thus, similarly, in the two-stage explosive ignition device that operates the ignition element 22 to ignite the first-stage explosive 20 and then receives the energy to ignite the second-stage explosive 14, In response to the detonation energy when detonating 20, the flyer 21 is accelerated to collide with the second stage explosive 14 and explode the second stage explosive 14, so that the input energy (electric energy) is detonated. It is possible to achieve a deflagration level that does not lead to a reduction in input energy.

  FIG. 3 shows a longitudinal section of still another example of the two-stage explosive ignition device according to the present invention.

  In the example shown in FIG. 3, a disc spacer 15 is provided between the first-stage explosive 20 and the second-stage explosive 14, and the central hole is used as an exercise space 16 that is a movement area of the flyer 21. The flyer 21 is formed integrally with the spacer 15 using the same material, and is disposed in the motion space 16 adjacent to the first-stage explosive 20 held by the explosive holder 18. Others are the same as those of the two-stage explosive ignition device shown in FIG. 1, and the same reference numerals used for the corresponding parts in the example of FIG.

  FIG. 4 shows an example of the manufacturing process of the spacer 15.

  The spacer 15 is formed of a material having robustness that does not cause a large deformation or disappearance due to an impact when the first-stage explosive 20 burns. Here, as shown in (A), a steel disk 28 is used. Then, as shown in (B), the center of the disk 28 is cut in the thickness direction from one side, and a central hole is made on the other side leaving a remaining portion 30 of a constant thickness t1, and the exercise space 16 Form. Thereafter, as shown in (C), the periphery of the remaining portion 30 is cut along the inner periphery of the center hole, and the flyer 21 having the thin-walled portion 31 is integrally formed on the spacer 15 using the same material.

  When the explosive ignition device shown in FIG. 3 is used, similarly, an input energy of 0.7 J (a voltage of 0.8 kV is charged to the capacitor) is applied to the ignition element 22 by a drive circuit (not shown). Is activated to explode without exploding the first stage explosive 20, receiving the deflagration energy, cutting at the thin-walled portion 31, accelerating the flyer 21 through the movement space 16 in the direction of the second stage explosive 14, Collide with the second explosive 14 and explode the second explosive 14.

  3 and 4, the two-stage explosive ignition device that operates the ignition element 22 to ignite the first-stage explosive 20 and then receives the energy to ignite the second-stage explosive 14. , The flyer 21 is accelerated by colliding with the detonation energy when the first stage explosive 20 was detonated and collides with the second stage explosive 14 to explode the second stage explosive 14. The energy can be reduced to a detonation level that does not reach the detonation level, and the input energy can be reduced.

  Further, since the flyer 21 is integrally formed on the spacer 15 using the same material, the position of the flyer 21 can be fixed securely, and the flyer 21 as an independent part can be eliminated to reduce the number of parts and assemble. Can be simple.

  FIG. 5 shows a longitudinal section of still another example of the two-stage explosive ignition device according to the present invention.

  In the example shown in FIG. 5, a disc spacer 15 is provided between the first-stage explosive 20 and the second-stage explosive 14, and the central hole is used as an exercise space 16 that is a movement area of the flyer 21. 3 and 4, the spacers 15 are integrally formed with the flyer 21 using the same material and are arranged in the motion space 16. At the same time, the explosive holder 18 holding the first stage explosive 20 is also integrally formed using the same material. The flyer 21 is provided adjacent to the first stage explosive 20. In this example as well, the rest is the same as that of the two-stage explosive ignition device shown in FIG. 1, and the same reference numerals used for the corresponding parts in the example of FIG.

  In FIG. 6, the other example of the manufacturing process of the spacer 15 which provided the flyer 21 and the explosive holder 18 integrally is shown.

  As the spacer 15, similarly, as shown in FIG. And as shown to (B), while cutting the center of the disk 28 to the middle in the thickness direction from the surface side, a center hole is made and the movement space 16 is formed, and the center of the disk 28 is set to the back side. Is also cut in the thickness direction, leaving an intermediate remaining portion 32 of a constant thickness t2 in the middle, and forming an explosive housing hole 33. Thereafter, as shown in (C), the periphery of the intermediate remaining portion 32 is cut along the inner periphery of the center hole, and the flyer 21 having the thin portion 34 is integrally formed on the spacer 15 using the same material. . At the same time, the explosive holder 18 that holds the first-stage explosive 20 is integrally formed using the same material, and the explosive storage hole 33 is filled with the first-stage explosive 20 later.

  Also in the example shown in FIGS. 5 and 6, the two-stage explosive ignition device that operates the ignition element 22 to ignite the first-stage explosive 20 and then receives the energy to ignite the second-stage explosive 14. , The detonation energy received when detonating the first stage explosive 20 is cut at the thin-walled portion 34, the flyer 21 is accelerated and collides with the second stage explosive 14 through the movement space 16, and the second stage explosive. Since 14 is detonated, the input energy (electric energy) can be set to a deflagration level that does not reach the detonation level, and a reduction in input energy can be realized.

  In addition, since the flyer 21 is formed integrally with the spacer 15 using the same material, the position of the flyer 21 can be securely fixed, and the explosive holder 18 is also formed integrally with the spacer 15 using the same material. The explosive holder 18 can be eliminated together with the flyer 21 as an independent part, so that the number of parts can be reduced and the assembly can be simplified.

  By the way, in the above-described example, the central space is provided by cutting at the center of the disk 28 to form the motion space 16. However, the motion space 16 can be formed not only by cutting but also by pressing or casting. .

1 is a longitudinal sectional view of a two-stage explosive ignition device according to the present invention. It is a longitudinal cross-sectional view of the other example of the two-stage type explosive ignition device by this invention. It is a longitudinal cross-sectional view of the further another example of the two-stage type explosive ignition device by this invention. It is process drawing of an example of the manufacturing process of a spacer. It is a longitudinal cross-sectional view of still another example of the two-stage explosive ignition device according to the present invention. It is process drawing of the other example of the manufacturing process of the spacer which provided the acceleration body and the gunpowder holder integrally. It is a longitudinal cross-sectional view of a conventional two-stage explosive ignition device.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Case 11 Top of case 14 Second explosive 15 Spacer 16 Movement space 18 Explosive holder 20 First explosive 21 Flyer 22 Ignition element 23 Electrical connection terminal 24 Insulator

Claims (7)

In the two-stage explosive ignition device that activates the ignition element to ignite the first explosive and then receives the energy to ignite the second explosive.
When the ignition element is activated, the first stage explosive is detonated and accelerated in the direction of the second stage explosive to collide with the second stage explosive and receive the detonation energy of the first stage explosive. A two-stage explosive igniter comprising a flyer for detonating the second-stage explosive.   The two-stage explosive ignition device according to claim 1, wherein a thin film resistor element is used as the ignition element.   The two-stage explosive ignition device according to claim 1, wherein a semiconductor bridge element is used as the ignition element.   A spacer having a motion space that is a motion region of the flyer is provided between the first-stage explosive and the second-stage explosive, and the flyer is disposed in the motion space. The two-stage explosive ignition device according to any one of 1 to 3.   5. The two-stage explosive ignition device according to claim 4, wherein the flyer is integrally formed on the spacer using the same material.   The two-stage explosive igniter according to claim 4 or 5, wherein an explosive holder for holding the first-stage explosive is integrally formed on the spacer using the same material.   Fill the case with the top with the second stage explosive, then insert the explosive holder through the spacer and place the flyer placed in the spacer movement space adjacent to the first explosive held by the explosive holder A two-stage system, characterized in that an ignition element is placed outside the first stage explosive, and then the electrical connection terminal of the ignition element is pulled out to seal the entrance of the case with an insulator. A method for manufacturing an explosive ignition device.

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