Heterogeneous double-bridge double-chamber exploding foil ignition assembly

Abstract

The invention relates to a heterogeneous double-bridge double-chamber exploding foil ignition assembly, and belongs to the technical field of exploding foil initiating explosive device design. A shell 1 of the exploding foil ignition assembly and four contact pins 2 are sealed through glass to form a sealing piece, an insulating substrate 3 is assembled at the output end of the igniter assembly, Au transduction elements 4 and metal Cu transduction elements 5 are welded to the contact pins 2 in two paths respectively to form heterogeneous double bridge circuits, flyers 6 and acceleration chambers 7 are stacked in sequence, then a double-cavity charging ring 8 with a cross beam in the middle is assembled, and a medicament 9 and a medicament 10 are pressed in two paths to form the explosive ignition assembly. Two independent powder chambers are formed in cooperation with the acceleration chamber, and finally a cover plate 11 is placed in and sealed with the shell 1 through laser welding. According to the explosion foil igniter, two kinds of heterogeneous energy conversion elements are selected to be matched with the igniter structure design, the heterogeneous double-path redundancy design of the ignition unit of the igniter is achieved, the ignition reliability of the explosion foil igniter is improved, and meanwhile the requirement for 500 V non-ignition can be met.

Description

Technical Field

[0001] This invention belongs to the field of explosive foil pyrotechnics design technology, specifically relating to a heterogeneous double-bridge dual-chamber explosive foil ignition assembly. Background Technology

[0002] Explosive foil ignition technology is a high-safety ignition technology. It is a technology in which a transducer rapidly explodes under the action of a narrow pulse and high-power current. The plasma generated is sheared and constrained by the acceleration chamber to form a high-speed flying blade with high-speed kinetic energy. This flying blade then impacts the high-density main charge (usually HNS or B / KNO3) at high speed, thereby achieving detonation or ignition of the next stage of ignition or detonation sequence.

[0003] The ignition reliability of an explosive foil igniter depends on the ignition characteristics of the explosive foil transducer and the propellant within its ignition unit, as well as the degree of matching between them. As the core component of the ignition unit, the explosive foil transducer has a crucial impact on the igniter's performance. Common transducers include metallic Cu transducers.

[0004] Currently, traditional explosive foil igniters mostly employ single-bridge transducers. The "single bridge" in this transducer is a single structure made of the same material. This single-point design carries the risk of the transducer bridge structure being damaged due to the same cause (such as mechanical or temperature conditions), leading to ignition failure and other malfunctions, thus failing to effectively improve the ignition reliability of explosive foil igniters. While existing ignition / detonation system designs incorporate dual-redundancy, they typically use parallel dual igniters / detonators to improve system reliability. However, relying on a single drive circuit prevents independent control, or the dual-bridge transducers correspond to the same chamber, making it impossible to avoid ignition failures caused by the failure of the same agent.

[0005] Therefore, this invention designs a heterogeneous dual-bridge dual-chamber explosive foil ignition assembly with a compact structure. It can be adapted to dual independent ignition drive circuits, selectively driving or synchronously driving the ignition assembly to achieve the ignition function. At the same time, this ignition assembly can be combined with the subsequent detonation sequence to design a new type of explosive foil igniter / detonator with high reliability and high safety, improving the flexibility and adaptability of the ignition / detonation function. Summary of the Invention

[0006] (a) Technical problems to be solved

[0007] The technical problem to be solved by the present invention is how to provide a heterogeneous dual-bridge dual-chamber explosive foil ignition assembly to solve the problems of relying on a single drive circuit, which makes it impossible to achieve independent control, or the dual-bridge transducers corresponding to the same chamber, which cannot avoid ignition failure caused by the failure of the same agent.

[0008] (II) Technical Solution

[0009] To solve the above-mentioned technical problems, the present invention proposes a heterogeneous double-bridge dual-chamber explosive foil ignition assembly, comprising: a shell 1, a pin 2, an insulating substrate 3, an Au chip transducer 4, a metal Cu transducer 5, a flyer 6, an acceleration chamber 7, a dual-chamber charge ring 8, a charge I 9, a charge II 10, and a cover plate 11.

[0010] The housing 1 is provided with a double-chambered propellant ring 8 inside. The middle part of the double-chambered propellant ring 8 is provided with a crossbeam to separate the two propellant chambers. The top of the double-chambered propellant ring 8 is stacked with an acceleration chamber 7 and a flying plate 6 in sequence.

[0011] The flyer plate 6 is equipped with an Au chip transducer 4 and a Cu metal transducer 5. The Au chip transducer 4 and the Cu metal transducer 5 are respectively positioned above the two propellant cavities of the dual-cavity propellant ring 8. An insulating substrate 3 is provided on the top of the Au chip transducer 4 and the Cu metal transducer 5. Four identical pins 2 are symmetrically inserted into the insulating substrate 3. Two pins 2 have one end abutting against the Au chip transducer 4, and the other two pins 2 have one end connected to the Cu metal transducer 5, forming a heterogeneous dual-bridge transducer. The other end of the pins 2 extends to the outside of the housing 1.

[0012] The contact point between the pin 2 and the housing 1 is sealed, forming a sealing element;

[0013] The dual-chamber drug-filling ring 8 has two chambers respectively filled with drug I 9 and drug II 10, and a cover plate 11 is provided at the bottom and laser-welded for full metal sealing.

[0014] The Au chip transducer 4 and the Cu metal transducer 5 are both fixed on the insulating substrate 3. The Au chip transducer 4 is coated by electroplating or magnetron sputtering, and the Cu metal transducer 5 is coated by magnetron sputtering.

[0015] The Au chip transducer 4 and the metal Cu transducer 5 are not electrically interconnected.

[0016] The Au chip transducer 4 is connected to the two pins 2 of the bridge circuit by vacuum reflow soldering, and the Cu metal transducer 5 is connected to the two pins 2 of the bridge circuit by bonding soldering. The bridge resistance of both bridge circuits is set to 30mΩ±5mΩ.

[0017] The material of the flyer plate 6 is polyimide.

[0018] The acceleration chamber 7 is made of metal alloy or ceramic material, and two boring holes are opened on the acceleration chamber 7. The diameters of the two boring holes are respectively matched with the bridge regions of Au chip transducer 4 and metal Cu transducer 5.

[0019] The insulating substrate 3 is made of polyimide, ceramic, or glass.

[0020] (III) Beneficial Effects

[0021] This invention proposes a heterogeneous dual-bridge dual-chamber explosive foil ignition assembly. This invention employs a dual-bridge heterogeneous transducer, which not only meets the reliability requirements of the ignition unit but also reduces the risk of transducer failure due to the same cause. The dual-transducer redundancy design ensures that even if a single transducer or ignition circuit fails unexpectedly, the other transducer can still complete the ignition (detonation) task, greatly reducing the probability of misfire and completely eliminating single-point failure modes.

[0022] This invention uses two types of transducers: metal Cu and Au chips. The bridge resistance is designed to be 30mΩ±5mΩ. Combined with other structural designs of the electric igniter, it meets the inertia requirement of not igniting at 500V.

[0023] This invention employs a dual-cavity propellant ring with a central crossbeam, forming two independent propellant chambers. These chambers can be filled with the same propellant to achieve energy redundancy, or with different propellants to achieve two separate matching with two different transducers. This allows a single command to trigger two different chemical energy outputs (detonation or ignition), improving the ignition and output reliability of the ignition assembly and expanding its application scenarios.

[0024] This invention achieves a dual-redundancy design for the explosive foil ignition assembly by using a heterogeneous dual-path transducer and a two-path reagent matching design, thereby improving the ignition reliability and output reliability of the explosive foil ignition assembly.

[0025] This invention utilizes laser welding to seal the shell and cover of the explosive foil ignition assembly. The welding heat-affected zone is small, and no explosion occurred during the process, effectively preventing the reagent from becoming damp and failing. A helium mass spectrometry leak test was conducted under a pressure difference of 0.1 MPa, achieving a leak rate of 10%. -9 -10 -7 )cm 3 / s, compared to traditional pyrotechnic products, the sealing performance of the joints and curing adhesive is better.

[0026] The flyer and insulating substrate selected in this invention are both insulating materials with excellent insulation and antistatic properties, meeting the insulation and antistatic requirements between pins, between pins and the housing, and between heterogeneous transducers, thereby ensuring that the explosive foil pyrotechnics have higher insulation and antistatic properties.

[0027] The explosive foil ignition assembly of this invention integrates the housing 1 and four pins 2 into a single sealed unit via glass sealing. This improves the overall structural strength and reverse pressure resistance of the ignition assembly, further enhancing its overload resistance. Simultaneously, it protects the ignition assembly from the impact of high temperature and high pressure energy after ignition, ensuring the integrity of the product structure. The various functional areas of this explosive foil ignition assembly are integrated using high-performance sealing processes such as brazing, glass sintering, or laser welding, making the entire ignition assembly a robust, fully sealed unit capable of withstanding harsh environments such as extreme temperatures, humidity, vacuum, vibration, and impact. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the structure of the explosive foil ignition assembly of the present invention;

[0029] Figure 2 This is a schematic diagram of a heterogeneous dual-bridge transducer structure.

[0030] Figure 3 This is a schematic diagram of a dual-cavity propellant ring structure;

[0031] Figure 4 A schematic diagram of welding a dual-bridge heterogeneous transducer;

[0032] Figure 5 A schematic diagram of a dual-hole acceleration chamber;

[0033] Figure 6 This is a schematic diagram of a flying plate;

[0034] Figure 7 A three-dimensional schematic diagram of the structure of the explosive foil ignition assembly. Detailed Implementation

[0035] 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 with reference to the accompanying drawings and examples.

[0036] This embodiment provides a heterogeneous dual-bridge dual-chamber explosive foil ignition assembly, including: a housing 1, a pin 2, an insulating substrate 3, an Au chip transducer 4, a metal Cu transducer 5, a flyer 6, an acceleration chamber 7, a dual-chamber charge ring 8, agent I 9, agent II 10, and a cover plate 11.

[0037] The housing 1 is provided with a double-chambered propellant ring 8 inside. The middle part of the double-chambered propellant ring 8 is provided with a crossbeam to separate the two propellant chambers. The top of the double-chambered propellant ring 8 is stacked with an acceleration chamber 7 and a flying plate 6 in sequence.

[0038] The flyer plate 6 is equipped with an Au chip transducer 4 and a Cu metal transducer 5. The Au chip transducer 4 and the Cu metal transducer 5 are respectively positioned above the two propellant cavities of the dual-cavity propellant ring 8. An insulating substrate 3 is provided on the top of the Au chip transducer 4 and the Cu metal transducer 5. Four identical pins 2 are symmetrically inserted into the insulating substrate 3. Two pins 2 have one end abutting against the Au chip transducer 4, and the other two pins 2 have one end connected to the Cu metal transducer 5, forming a heterogeneous dual-bridge transducer. The other end of the pins 2 extends to the outside of the housing 1.

[0039] The contact point between the pin 2 and the housing 1 is sealed, forming a sealing element;

[0040] The dual-chamber drug-filling ring 8 has two chambers respectively filled with drug I 9 and drug II 10, and a cover plate 11 is provided at the bottom and laser-welded for full metal sealing.

[0041] The Au chip transducer 4 and the Cu metal transducer 5 are both fixed on the insulating substrate 3. The Au chip transducer 4 is coated by electroplating or magnetron sputtering, and the Cu metal transducer 5 is coated by magnetron sputtering.

[0042] The Au chip transducer 4 and the metal Cu transducer 5 are not electrically interconnected.

[0043] The Au chip transducer 4 is connected to the two pins 2 of the bridge circuit by vacuum reflow soldering, and the Cu metal transducer 5 is connected to the two pins 2 of the bridge circuit by bonding soldering. The bridge resistance of both bridge circuits is set to 30mΩ±5mΩ.

[0044] The material of the flyer plate 6 is polyimide.

[0045] The acceleration chamber 7 is made of metal alloy or ceramic material, and two boring holes are opened on the acceleration chamber 7. The diameters of the two boring holes are respectively matched with the bridge regions of Au chip transducer 4 and metal Cu transducer 5.

[0046] The insulating substrate 3 is made of polyimide, ceramic, or glass.

[0047] The explosive foil ignition assembly housing 1 and the four pins 2 are sealed together with glass or PEEK (polyether ether ketone) to form a sealing component.

[0048] Specific working principle:

[0049] The Au chip transducer 4 is vacuum reflow soldered to the two pins 2 of the bridge circuit, and the metal Cu transducer 5 is bonded to the two pins 2 of the bridge circuit to form current paths. The double-bridge explosive foil generates plasma under the action of pulsed high current. The plasma violently impacts the flyer layer (such as polyimide) above it and shears it into small pieces. Under the constraint of the double-hole acceleration chamber, it is accelerated to a high speed of more than 3000m / s. The high-speed flyer impacts the propellant I9 and propellant II10 in the double-cavity charge ring 8 to generate a strong shock wave, causing the charge to detonate and convert into detonation output.

[0050] Method 1: Simultaneous detonation of both explosive chambers;

[0051] Method 2: Detonate either of the two explosive chambers simultaneously;

[0052] Method 3: Fill with different reagents to achieve different chemical outputs.

[0053] This invention employs a double-cavity propellant ring with a central crossbeam, forming two independent propellant chambers. These chambers can be filled with the same propellant to achieve energy redundancy, or with different propellants to achieve two separate matching with two different transducers. This allows a single command to trigger two different chemical energy outputs (detonation or ignition), improving the ignition and output reliability of the ignition assembly and expanding its functionality.

[0054] 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 heterogeneous double-bridge dual-chamber explosive foil ignition assembly, characterized in that, include: The components include: housing (1), pin (2), insulating substrate (3), Au chip transducer (4), metal Cu transducer (5), flying plate (6), acceleration chamber (7), dual-cavity charge ring (8), agent I (9), agent II (10), and cover plate (11). The housing (1) is provided with a double-cavity charge ring (8) inside. The middle part of the double-cavity charge ring (8) is provided with a crossbeam to separate the two charge chambers. The top of the double-cavity charge ring (8) is stacked with an acceleration chamber (7) and a flying blade (6). The flyer plate (6) is provided with an Au chip transducer (4) and a metal Cu transducer (5). The Au chip transducer (4) and the metal Cu transducer (5) are respectively located above the two drug cavities of the dual-cavity drug ring (8). An insulating substrate (3) is provided on the top of the Au chip transducer (4) and the metal Cu transducer (5). Four pins (2) with the same structure are symmetrically inserted into the insulating substrate (3). One end of two pins (2) abuts against the Au chip transducer (4), and the other two pins (2) are connected to the metal Cu transducer (5) at one end, forming a heterogeneous dual-bridge transducer. The other end of the pins (2) extends to the outside of the housing (1). The contact point between the pins (2) and the housing (1) is sealed to form a sealing member. The dual-chamber drug ring (8) has two chambers respectively filled with drug I (9) and drug II (10), and a cover plate (11) is provided at the bottom and laser-welded for full metal sealing.

2. The heterogeneous double-bridge dual-chamber explosive foil ignition assembly as described in claim 1, characterized in that, The Au chip transducer (4) and the Cu metal transducer (5) are both fixed on the insulating substrate (3). The Au chip transducer (4) is coated by electroplating or magnetron sputtering, and the Cu metal transducer (5) is coated by magnetron sputtering. The Au chip transducer (4) and the metal Cu transducer (5) are not electrically interconnected.

3. The heterogeneous double-bridge dual-chamber explosive foil ignition assembly as described in claim 1, characterized in that, The Au chip transducer (4) is vacuum reflow soldered to the two pins (2) of the bridge circuit, and the metal Cu transducer (5) is bonded to the two pins (2) of the bridge circuit. The bridge resistance of both bridge circuits is set to 30mΩ±5mΩ.

4. The heterogeneous double-bridge dual-chamber explosive foil ignition assembly as described in claim 1, characterized in that, The material of the flyer plate (6) is polyimide.

5. The heterogeneous double-bridge dual-chamber explosive foil ignition assembly as described in claim 1, characterized in that, The acceleration chamber (7) is made of metal alloy or ceramic material. Two boring holes are opened on the acceleration chamber (7), and the diameters of the two boring holes are respectively matched with the bridge regions of Au chip transducer (4) and metal Cu transducer (5).

6. The heterogeneous double-bridge dual-chamber explosive foil ignition assembly as described in claim 1, characterized in that, The insulating substrate (3) is made of polyimide, ceramic, or glass.

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