Highly insensitive integrated non-contact firing assembly

Abstract

The application relates to a high-insensitive integrated non-contact ignition assembly, which comprises a shell 1, a charge 2, a gap ring 3 and a transducing element 4; the charge 2, the gap ring 3 and the transducing element 4 are sequentially arranged in the shell, and the gap ring 3 is arranged between the transducing element 4 and the charge 2; the transducing element 4 comprises an energetic film 6, a conductive layer 7, a bridge foil substrate 8, a ceramic shell, an NTC thermistor 11 and a foot wire 14; the application has low initiation energy, the bridge area is connected in parallel with the NTC thermistor, the shunt ratio can reach 60%, the bridge area temperature can be reduced by 50%, the 2A4W5min non-ignition requirement can be realized, the high-insensitive requirement of the initiating explosive device is met, the bridge area is plated with an Al / CuO composite energetic bridge model, the modulation period is designed, the modulation ratio is modulated, the ignition device output energy reaches the effect of reliable ignition of 1mm gap, the maximum flame height is greater than or equal to 3mm, and the production efficiency and the consistency of the non-contact ignition assembly can be improved.

Description

Technical Field

[0001] This invention belongs to the field of pyrotechnics technology, specifically relating to a highly insensitive integrated non-contact ignition component. Background Technology

[0002] Pyrotechnics are energy conversion elements that drive the detonation sequence of ammunition. They are the initial energy source for detonation, enabling detonation, ignition, and combustion, and have a significant impact on the safety, reliability, and combat effectiveness of ammunition. Non-contact pyrotechnics with energetic metal bridges, because the transducer element does not contact the propellant, can prevent stray current, static electricity, and radio frequency hazards, thus meeting safety requirements. However, due to limitations in excitation energy and the mass of the bridge region itself, unreliable ignition may occur when igniting or detonating insensitive propellants, or when there is an air gap between the propellant interface and the transducer element. Therefore, conducting research on non-contact ignition technology to improve the ignition safety and reliability of pyrotechnics is essential in the context of modern weapon systems applications. Summary of the Invention

[0003] This invention provides a highly insensitive integrated non-contact ignition component. The technical problem to be solved is that the safety of pyrotechnic transducer components in weapons and equipment is difficult to guarantee in the increasingly complex modern battlefield environment, with harsh environments such as strong electromagnetic radiation and strong electric field interference.

[0004] To solve the above technical problems, the present invention provides a highly insensitive integrated non-contact ignition assembly, characterized in that it includes a housing 1, a charge 2, a gap ring 3, and a transducer element 4; the charge 2, gap ring 3, and transducer element 4 are sequentially disposed within the housing, with the gap ring 3 positioned between the transducer element 4 and the charge 2; the transducer element 4 includes an energetic thin film 6, a conductive layer 7, a bridge foil substrate 8, a ceramic shell, an NTC thermistor 11, and lead wires 14; the conductive layer 7 is sputtered onto the upper surface of the bridge foil substrate 8, the conductive layer 7 having an S-shaped structure, with the center of the S-shape... The bridge region is formed by sputtering an energetic thin film 6 at its center, which is formed by alternating sputtering of Al and CuO films. The ceramic shell 10 and lead wires 14 are sintered to form an electrode plug. The lead wires 14 are higher than the plane of the ceramic shell 10. The bottom surface of the bridge foil substrate 8 is welded to the top surface of the ceramic shell. One end of the lead wires 14 is welded to the through-hole of the bridge foil substrate 8. The bottom surface of the ceramic shell is designed with a groove for fixing the NTC thermistor 11. The NTC thermistor 11 is connected to the two lead wires 14 through conductive silver paste 12, so that the thermistor and the bridge region form a parallel circuit.

[0005] Beneficial effects: The advantages are as follows:

[0006] 1. Compared to traditional ignition components, this ignition component has a low initiation energy (it can reliably function at ≥0.06J);

[0007] 2. The NTC thermistor is connected in parallel in the bridge area, and the shunt ratio can reach 60%, which can reduce the temperature of the bridge area by 50% and achieve the requirement of 2A 4W 5min non-ignition, thus meeting the high insensitivity requirements of pyrotechnics.

[0008] 3. The bridge area is coated with an Al / CuO composite energetic bridge mold. By designing the modulation cycle and modulation ratio, the output energy of the igniter can achieve reliable ignition with a 1mm gap and a maximum flame height ≥3mm.

[0009] 4. The transducer element adopts an integrated design, combining the thermistor and the transducer element together. The ignition assembly is simple and quick to assemble, with a compact structure, which can improve the production efficiency and product consistency of non-contact ignition assemblies. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the non-contact ignition assembly structure;

[0011] Figure 2 This is a schematic diagram of the transducer element structure;

[0012] Figure 3 This is a schematic diagram of the conductive layer structure.

[0013] The components are: 1-shell, 2-charge, 3-gap ring, 4-transducer element, 5-sealing ring; 6-energized thin film; 7-conductive layer; 8-bridge foil substrate; 9-epoxy resin adhesive; 10-ceramic shell; 11-NTC thermistor; 12-conductive silver paste; 13-914 adhesive; 14-lead wire. Detailed Implementation

[0014] To make the objectives, contents, and advantages of the present invention clearer, the specific embodiments of the present invention will be described in further detail below.

[0015] This invention proposes a highly insensitive integrated non-contact ignition assembly, comprising a housing 1, a charge 2, a gap ring 3, a transducer element 4, and a sealing ring 5. The housing 1 is machined from stainless steel. The charge 2 is potassium boronitrate (B / KNO3). The charge 2, gap ring 3, and transducer element 4 are sequentially arranged inside the housing. The gap ring 3 is placed between the transducer element 4 and the charge 2. The gap is adjusted to different heights for gap ignition. A sealing ring 5 is provided between the bottom of the transducer element 4 and the housing to prevent air from reacting chemically with the energetic film.

[0016] The transducer 4 includes an energetic thin film 6, a conductive layer 7, a bridge foil substrate 8, a ceramic shell, an epoxy resin adhesive 9, an NTC thermistor 11, a conductive silver paste 12, a 914 adhesive 13, and lead wires 14. The transducer adopts an integrated design, with the energetic thin film 6, the conductive layer 7, the bridge foil substrate 8, and the electrode plug sequentially arranged and packaged together, which is beneficial for the assembly of the ignition assembly.

[0017] After the conductive layer 7 is sputtered on the top surface of the bridge foil substrate 8 by magnetron sputtering, the energetic thin film 6 is sputtered on the conductive layer 7. The bridge foil substrate 8 is metallized with vias, and the vias of the bridge foil substrate are soldered to the leads. The upper surface of the ceramic shell is soldered to the bottom surface of the bridge foil substrate. From top to bottom, the layers are: 6 energetic thin film, 7 conductive layer, 8 bridge foil substrate, and 9 electrode plug.

[0018] The ceramic housing 10 and lead wire 14 are sintered to form an electrode plug. The lead wire 14 is higher than the plane of the ceramic housing 10. The position of the bridge foil substrate 8 and the ceramic housing 10 is defined by the electrode pin positioning method, and the two are soldered together by reflow soldering.

[0019] The ceramic casing features a groove on its bottom surface. An NTC thermistor 11 is adhered to this groove using epoxy resin adhesive 9. Simultaneously, conductive silver paste 12 connects the NTC thermistor to the two leads 14, creating a parallel circuit between the thermistor and the bridge region for enhanced safety. When a 2A constant current power supply is applied, the NTC thermistor can quickly shunt the current, lowering the bridge region's temperature to thermal equilibrium. This ensures that the bridge region does not experience accidental sparking or melting under safe current conditions, achieving the high inertia requirement of 2A 4W 5min without sparking.

[0020] The conductive layer is a Ni / Cr film. Al / CuO is sputtered on the conductive layer to form a composite energetic thin film 6. The Al film and CuO film are sputtered alternately, with each Al film and CuO film forming a group, for a total of 40 groups. The parameters of the energetic thin film are shown in the table below.

[0021]

[0022] Through the design of the modulation period and modulation ratio of the above-mentioned energetic thin film, the non-contact energetic metal bridge transducer can reliably function when the input energy is ≥0.06J; the maximum flame height is greater than or equal to 3mm; and the storage life is not less than 5 years.

[0023] Figure 3 The diagram shows the structure of the conductive layer. The invention designs an "S"-shaped nickel-chromium alloy conductive layer, with the bridge area inside the dashed box.

[0024] The conductive layer is symmetrical at its origin, with the bridge region at the center of the "S" shape. The aspect ratio is 1, and the two ends of the "S" shape are lead wire vias. The conductive layer is sputtered onto a ceramic substrate; the nickel-chromium alloy conductive layer is model 6J20 (approximately 80% Ni and 20% Cr). A composite energetic thin film is sputtered at the center of the bridge region. The "S"-shaped bridge region design accelerates the convective heat transfer rate between the bridge region and the air, increases the heat dissipation rate of the bridge region, and enhances the high insensitivity performance of the transducer.

[0025] Working principle: Under transient, high current density excitation, the energetic thin film mainly releases chemical energy in the form of an electro-explosion. Under these excitation conditions, a large number of electrons collide violently with the crystal lattice, and the resulting Joule heat is rapidly loaded onto the energetic thin film with a high energy density, causing the film to be vaporized, ionized, and form plasma in a short time, which then acts on the B / KNO3 propellant grain through the gap. The electro-explosion of the energetic thin film is characterized by short action time and high output energy. Its reaction time is generally on the microsecond level, and the reaction temperature can reach 3000K-5000K. Under strong confinement conditions, it can even form a weak shock wave. Based on the electro-explosion characteristics of the energetic thin film, it is applied to non-contact ignition components. An NTC thermistor is integrated into the transducer and connected in parallel with the bridge region. The NTC thermistor can divert 60% of the current in a short time, making the current flowing through the bridge region less than 1A, achieving a high insensitivity effect. The “S”-shaped bridge design accelerates the convective heat transfer rate between the bridge and the air, increases the heat dissipation rate of the bridge, and enhances the high insensitivity performance of the transducer.

[0026] The ignition assembly adopts an integrated design, directly integrating the NTC thermistor into the transducer. Gap rings of varying heights can be used to meet ignition requirements at different gap heights.

[0027] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A highly insensitive integrated non-contact ignition component, characterized in that: The device includes a housing (1), a charge (2), a gap ring (3), and a transducer (4). The charge (2), gap ring (3), and transducer (4) are sequentially arranged inside the housing, with the gap ring (3) placed between the transducer (4) and the charge (2). The transducer (4) includes an energetic thin film (6), a conductive layer (7), a bridge foil substrate (8), a ceramic shell, an NTC thermistor (11), and lead wires (14). A conductive layer (7) is sputtered on the upper surface of the bridge foil substrate (8). The conductive layer (7) has an S-shaped structure, with the bridge region at the center of the S-shape. The center of the bridge region is sputtered. An energetic thin film (6) is formed by alternating sputtering of Al film and CuO film; a ceramic shell (10) and lead wires (14) are sintered to form an electrode plug, the lead wires (14) are higher than the plane of the ceramic shell (10), the bottom surface of the bridge foil substrate (8) is welded to the top surface of the ceramic shell, and one end of the lead wires (14) is welded to the through hole of the bridge foil substrate (8); a groove is designed on the bottom surface of the ceramic shell to fix the NTC thermistor (11), the NTC thermistor (11) is connected to the two lead wires (14) through conductive silver paste (12) so that the thermistor and the bridge region form a parallel circuit.

2. The highly insensitive integrated non-contact ignition component according to claim 1, characterized in that: A sealing ring (5) is provided between the bottom of the transducer element (4) and the housing.

3. The highly insensitive integrated non-contact ignition assembly according to claim 1, characterized in that: The transducer element adopts an integrated design.

4. The highly insensitive integrated non-contact ignition component according to claim 1, characterized in that: The aspect ratio of the bridge section is 1.

5. The highly insensitive integrated non-contact ignition assembly according to claim 1, characterized in that: The conductive layer is a Ni / Cr film, which consists of 80% Ni and 20% Cr.

6. The highly insensitive integrated non-contact ignition assembly according to claim 1, characterized in that: The bridge foil substrate (8) is metallized with vias.

7. The highly insensitive integrated non-contact ignition assembly according to claim 1, characterized in that: The NTC thermistor (11) is attached to the groove at the bottom of the ceramic housing using epoxy resin adhesive (9).

8. The highly insensitive integrated non-contact ignition assembly according to claim 1, characterized in that: Al films and CuO films are sputtered alternately, with each Al film and CuO film forming a group, for a total of 40 groups.

9. The highly insensitive integrated non-contact ignition assembly according to claim 8, characterized in that: The conductive layer has a thickness of 1 μm, the Al film has a single layer thickness of 25 nm, the CuO film has a single layer thickness of 50 nm, and the modulation period of a set of Al and CuO films is 75 nm.

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