Ignition by impact and needle piercing dual axial redundant input large diameter low power squib

Abstract

The application discloses a big-diameter small-power fire cap with dual-axial redundant input of percussion and needle-piercing for bullet trigger fuse, mainly comprising a tube shell, a cover sheet, needle-piercing / initiation mixed powder and inert powder, wherein the tube shell is in a cylindrical shape, both ends of the tube shell are needle-piercing input ends, the upper layer, i.e. the bottom part of the tube, is uniformly distributed with the needle-piercing / initiation mixed powder to ensure that the upper end surface realizes percussion firing of the fuse, thereby being beneficial to large-angle percussion firing of the fuse and ground-scratching explosion, and the lower layer is only filled with the needle-piercing / initiation mixed powder at the central part to realize central needle-piercing firing, and the periphery of the central part is filled with the inert powder, so that the central bottom firing function is retained, the internal powder amount is reduced, the power is lowered, and the safety of the fuse is improved.

Description

Technical Field

[0001] This invention pertains to fuse explosion element technology, specifically relating to a fuse with dual-axial redundant input of impact and needle penetration, large diameter, small power cap. Background Technology

[0002] Fuses, being explosive elements, are a crucial component of pyrotechnic devices. With improvements in fuze performance, functionality, and reliability requirements, the demand for both the variety and quantity of explosive elements is increasing. However, from the perspective of fuze explosion-proof safety, the fewer explosive elements inside the fuze, the better. Therefore, while meeting functional requirements, it is desirable for fuze explosive elements to evolve from single-function to multi-function components.

[0003] To address the issue of ignition reliability, fuses often incorporate multiple ignition mechanisms. Under explosion-proof safety constraints, these mechanisms typically share a single initial explosive element, such as a percussion cap. To enable the percussion cap to adapt to different ignition mechanisms in different orientations and directions—such as impact-triggered, impact-triggered, and inertial-triggered ignition mechanisms—the percussion cap needs to have multi-directional input capabilities. This design is not optimal for small-caliber projectile fuses with limited internal cavity space, but rather a necessary compromise to ensure explosion-proof safety.

[0004] The multi-directional input needle-punched ignition cap disclosed in CN 114136159A has the function of multi-directional input, but since its input is all by needle-punching ignition, it is difficult to meet the requirements of ground-penetrating blast and large-angle ignition.

[0005] Because the outer edge of the upper part of the percussion cap uses the impact ignition principle, the diameter of the percussion cap needs to be increased to improve ignition reliability. However, increasing the diameter of the percussion cap means that more explosive charge can be loaded, resulting in greater power. This, in turn, cannot guarantee the structural strength, i.e., the explosion-proof safety, in the event of accidental ignition. Therefore, it is necessary to reduce its power without reducing the diameter.

[0006] In summary, while the currently used percussion caps have multi-directional input capabilities, they are difficult to simultaneously meet the requirements of ground-penetrating detonation and high-angle-of-impact ignition, and cannot guarantee the high reliability of the fuse and the low rate of unexploded ordnance. Summary of the Invention

[0007] The purpose of this invention is to provide a large-diameter, low-power fuse cap with dual-axial redundant input of impact and needle penetration. This not only simplifies the fuse structure and improves the reliability of fuse ignition, but also reduces the power without reducing the diameter, thus helping to ensure explosion-proof safety.

[0008] The technical solution to achieve the purpose of this invention is as follows: A large-diameter, small-power incendiary cap with dual-axial redundant input of ignition impact and needle penetration, mainly comprising a shell, a first needle penetration / detonation mixture, a second needle penetration / detonation mixture, inert powder, and a cover plate. The shell is cylindrical, closed at one end and open at the other. The upper, closed end is fully filled with the first needle penetration / detonation mixture, and the middle part of the head shell is thinned to ensure needle penetration ignition at the head and impact ignition at the outer edge. The lower layer is filled with the second needle penetration / detonation mixture in the center, surrounded by inert powder. The bottom is sealed by the cover plate, which simultaneously enables needle penetration ignition at the bottom center.

[0009] Compared with the prior art, the advantages of this invention are:

[0010] (1) The percussion cap of this invention adopts a redundant input method combining needle-punch ignition and impact ignition at the upper end and needle-punch ignition at the lower end, realizing bidirectional input and adapting to various ignition mechanisms in the fuze. Since the upper end adopts outer edge impact ignition, the diameter of the percussion cap needs to be increased to ensure ignition reliability. At the same time, inert powder is filled in the lower outer layer, which reduces the power without reducing the overall diameter of the percussion cap, thus ensuring its structural strength and explosion-proof safety in the event of accidental ignition.

[0011] (2) The present invention has a simple structure, is easy to process and easy to install. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of the large-diameter, small-power fire cap with dual-axial redundant input of ignition credit impact and needle puncture in this invention. Detailed Implementation

[0013] The present invention will now be described in further detail with reference to the accompanying drawings.

[0014] Combination Figure 1 The present invention discloses a large-diameter, small-power igniter with dual-axial redundant input of impact and needle-piercing ignition. It is a igniter structure with dual-axial input, namely needle-piercing and impact redundant input. Its output is mainly axial and secondarily radial. It mainly includes a shell 1, a first needle-piercing / detonating mixture 2, a second needle-piercing / detonating mixture 3, an inert charge 4, and a cover plate 5. The shell 1 is cylindrical. The closed end of the shell 1 serves as the composite input end for impact and needle-piercing, while the open end serves as the single needle-piercing input end. The center of the closed end of the shell 1 is thinned to improve the needle-piercing ignition sensitivity. The first needle-piercing / detonating mixture 2 is pressed into the bottom of the closed end of the shell 1, while the second needle-piercing / detonating mixture 3 is located below the center of the first needle-piercing / detonating mixture 2 and is cylindrical. It is surrounded by annular filling of inert charge 4. The cover plate 5 is coaxially arranged at the open end of the shell 1 to ensure sealing with a constricted structure.

[0015] A larger diameter is used to ensure the reliability of impact ignition at the outer edge of the fuse head. When the fuse is impacted from the front or side, the upper layer (front end) of the cap ignites due to needle-like or compressive forces. When the fuse self-destructs or is subjected to inertial forces, the lower layer (rear end) of the cap ignites due to needle-like forces. This achieves redundant input, which is beneficial for impact ignition at large angles and ground-penetrating detonation, thereby improving the reliability of the fuse and reducing the rate of unexploded ordnance.

[0016] The "large diameter" of the percussion cap refers to its diameter being no less than 4.1 mm, and the "low power" of the percussion cap refers to its lead nitride equivalent being no greater than that of an M55 detonator.

[0017] The first needle-piercing / detonating mixture 2 and the second needle-piercing / detonating mixture 3 are mixtures with needle-piercing and detonating functions, and have the same composition, both being a mixture of 4% tetrazide and 96% lead nitride.

[0018] The inert charge 4 is made of diatomaceous earth and is ring-shaped around the needle-punch detonating mixture 3. This retains the bottom center needle-punch ignition function while reducing the internal charge volume, lowering the explosive power, and ensuring the fuse's explosion-proof safety. The inert charge 4 can also be replaced with a low-density plastic ring, such as polytetrafluoroethylene (PTFE).

[0019] CN114370796A discloses a small-caliber spinning projectile trigger fuze with excellent explosive handling characteristics after misfire. For this small-caliber fuze, due to size limitations, it needs to fully meet the requirements of the "Fuse Safety Design Guidelines" while simultaneously possessing ground-penetrating, high-angle-of-impact ignition, and self-destruct capabilities. In this fuze application, the upper center of the percussion cap is needle-punch ignited, the outer edge of the upper cap is impact-ignited, and the lower center of the percussion cap is needle-punch ignited, thus achieving redundant input. This facilitates high-angle-of-impact ignition and ground-penetrating ignition, thereby improving the reliability of the fuze and reducing the rate of unexploded ordnance.

Claims

1. A large-diameter, small-power ignition cap with dual-axial redundant input of ignition source impact and needle penetration, characterized in that: It mainly includes a shell (1), a first needle-piercing / detonating mixture (2), a second needle-piercing / detonating mixture (3), an inert powder (4), and a cover plate (5). The shell (1) is cylindrical, closed at one end and open at the other. The upper layer, i.e. the closed end, is fully filled with the first needle-piercing / detonating mixture (2), and the middle part of the head shell is thinned to ensure the needle-piercing ignition at the head and the impact ignition at the outer edge. The lower layer is only filled with the second needle-piercing / detonating mixture (3) in the center and filled with inert powder (4) around it. The bottom is sealed by the cover plate (5), which at the same time realizes the needle-piercing ignition function in the center of the bottom. The first needle-piercing / detonating mixture (2) and the second needle-piercing / detonating mixture (3) have the same composition, both being a mixture of 4% tetrazide and 96% lead nitride; The inert medicine (4) is made of diatomaceous earth.

2. The large-diameter, small-power ignition cap with dual-axial redundant input of ignition source impact and needle puncture as described in claim 1, characterized in that: The inert charge surrounding the second needle-piercing / detonating mixture (3) can be replaced with a low-density plastic ring.

3. The large-diameter, small-power ignition cap with dual-axial redundant input of ignition source impact and needle puncture as described in claim 2, characterized in that: The low-density plastic is polytetrafluoroethylene.

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