A central spiral condensed shaped charge structure

Abstract

The application discloses a center screw condensation type shaped charge structure. The application can improve the collapsing speed of a liner 5 and reduce the jet stretching duration by setting a coaxial wave controller in a main charge without changing the existing shaped charge warhead structure, and the center screw is arranged at the center part of the liner, the thread on the screw is used for guiding the jet element, so that the speed of the jet element is reduced, the jet speed gradient is reduced, the jet element speed gradient formed by the collapsing of the liner is controlled, and the continuous fracture of the jet under different burst heights is ensured, so that the multipurpose application of the shaped charge warhead under different projectile-target action conditions can be effectively improved.

Description

Technical Field

[0001] This invention relates to the field of shaped charge technology, specifically to a central spiral condensed shaped charge structure. Background Technology

[0002] The shaped charge effect, also known as the Monroe effect, was first discovered in the 1980s. Based on the shaped charge effect and the structure of the shaped charge, shaped charge warheads have been widely used in anti-armor, anti-tank, and assault weapon platforms since World War II, demonstrating a huge penetration and destruction advantage, and have attracted the attention and continued in-depth research of countries around the world.

[0003] From a technical perspective, a shaped charge warhead first generates a shaped charge effect through the explosion of the shaped charge, violently compressing the metal shaped charge liner. The compressed liner converges along the axis and moves in a fluid-like manner, initially forming a jet. Due to the velocity gradient between the jet elements, the jet continuously stretches and increases in length during its movement along the axis. Because of the high velocity and kinetic energy of the jet elements, it can produce a significant penetration and damage effect on the target. From the perspective of interaction with the target, the greater the effective mass, the longer the length, and the higher the velocity of the jet, the stronger its penetration and damage power. However, the velocity gradient of the elements will cause the jet to continuously stretch and lengthen during its formation. As the detonation height increases, continuous stretching will lead to phenomena such as necking and fracture of the jet, ultimately severely affecting its penetration power. In other words, to maximize the high damage power of a shaped charge warhead, it is necessary to avoid large detonation heights, that is, to interact with the target under reasonable detonation height conditions. This places high demands on the conditions for the interaction between the shaped charge warhead and the target, and further limits the multi-purpose development of shaped charge warheads. Summary of the Invention

[0004] In view of this, the present invention provides a central spiral condensed shaped charge structure that can regulate the jet velocity gradient formed by traditional shaped charge warheads, resulting in a small jet velocity gradient, a large jet diameter, and strong destructive power. It can achieve continuous and unbroken jet under different blast height conditions, thereby further enhancing the multi-purpose application of shaped charge warheads under different projectile-target action conditions.

[0005] The central spiral condensing shaped charge structure of the present invention includes an initiation mechanism, a shell, a main charge, a shaped charge liner, a waveform controller, and a central screw; the shaped charge liner is conical.

[0006] The waveform controller is coaxially installed inside the main charge and located between the detonation mechanism and the shaped charge liner; the waveform controller is made of explosive with a detonation velocity lower than that of the main charge or an inert material with a wave impedance higher than that of the main charge.

[0007] The central screw is vertically fixed at the top center of the inner wall of the shaped charge liner. The central screw is made of high-strength metal or non-metal material and has threads on its outer surface.

[0008] Preferably, the waveform controller is a truncated cone with its large end facing the bottom surface of the housing.

[0009] Preferably, the waveform controller is made of plastic, nylon, or explosives with a detonation velocity of 4000m / s to 5000m / s.

[0010] Preferably, the thread profile of the center screw is a pipe thread.

[0011] Preferably, the product of the thread pitch and the mean diameter of the central screw is not less than the product of the average diameter of the jet at twice the blast height and the pitch under the same charge structure.

[0012] Preferably, the center screw is made of tungsten, tantalum or ceramic.

[0013] Preferably, the housing is made of aluminum alloy, titanium alloy or polyetheretherketone.

[0014] Preferably, the main charge is a high-energy explosive with a stable detonation velocity of not less than 8000 m / s.

[0015] Preferably, the aspect ratio of the main charge is 0.8 to 1.2.

[0016] Preferably, the shaped charge cover is made of copper or tantalum.

[0017] Beneficial effects:

[0018] This invention, without significantly altering the existing structure of the shaped charge warhead, incorporates a coaxial waveform controller within the main charge. This increases the collapse angle of the shaped charge liner, thereby increasing the collapse velocity of the liner 5 and reducing the duration of jet stretching. Simultaneously, a central screw is installed at the center of the liner, using the threads on the screw to guide the jet micro-elements, thus decelerating the jet micro-elements and reducing the jet velocity gradient. This allows for the regulation of the jet micro-elements velocity gradient formed by the collapse of the liner, ensuring continuous and unbroken jet flow under different detonation altitudes. This effectively enhances the multi-purpose application of shaped charge warheads under various target conditions.

[0019] By designing the dimensions of the waveform controller and the central screw, it is possible to achieve a focused jet that does not neck or break under conditions of more than 5 times the blast height, thus creating a deeper penetration hole in the target. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the shaped charge structure of the present invention.

[0021] Figure 2 This is a schematic diagram of the shell structure in this invention.

[0022] Figure 3This is a schematic diagram of the main charge structure in this invention.

[0023] Figure 4 This is a schematic diagram of the structure of the Chinese medicine cover in this invention.

[0024] Figure 5 This is a schematic diagram of the waveform controller structure in this invention.

[0025] Figure 6 This is a schematic diagram of the central screw structure in this invention.

[0026] Figure 7 This is a schematic diagram of the screw pressing structure of the present invention.

[0027] Figure 8 The image shows a comparison of the jet morphology formed by the shaped charge of this invention and that of a conventional shaped charge; wherein, Figure 8 (a) is the shaped charge jet formed by the shaped charge of the present invention. Figure 8 (b) is a shaped charge jet formed by a traditional shaped charge.

[0028] Among them, 1-detonation mechanism, 2-shell, 3-waveform controller, 4-main charge, 5-charge liner, 6-center screw, 7-press screw. Detailed Implementation

[0029] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0030] This invention provides a centrally spiral condensed shaped charge structure, such as... Figure 1 As shown, it includes an initiation mechanism 1, a housing 2, a waveform controller 3, a main charge 4, a shaped charge liner 5, a central screw 6, and a pressure screw 7; wherein, the main charge 4 is filled inside the housing 2; the initiation mechanism 1 is installed at the bottom of the housing 2 and is attached to the main charge 4 for initiating the main charge 4; the shaped charge liner 5 is installed at the top of the housing 2, located in a groove reserved at the top of the main charge, and is attached to the main charge 4. The shaped charge liner 5 is crushed under the explosion of the main charge 4 to form a jet.

[0031] The detonation mechanism 1 can employ single-point center detonation, end-face multi-point detonation, or other detonation methods. In this embodiment, center detonation is used, therefore the casing 2 is a stepped axial circular tube, such as... Figure 2 As shown, the small end is used to install the detonation mechanism 1, and the large end is used to load the main charge 4.

[0032] The shell 2 is generally made of low-density metal materials, such as aluminum alloys and titanium alloys, or high-molecular non-metallic materials, such as polyetheretherketone.

[0033] Main charge 4 Figure 3As shown, the overall shape is cylindrical, with one end being a standard cylinder and the other end having a groove consistent with the shape of the shaped charge liner 5. The main charge 4 is coaxially filled into the shell 2, with the bottom surface of the cylindrical end tightly fitted to the inner bottom surface of the shell 2. The shaped charge liner 5 is installed in the groove of the main charge 4 and is tightly fitted to the main charge 4. The main charge 4 is generally made of high-energy explosive pressed by a mold, with a stable detonation velocity of not less than 8000 m / s and a length-to-diameter ratio of 0.8 to 1.2.

[0034] Drug-shaped mask 5 Figure 4 As shown, it is a thin-walled conical structure made of metals with high density, good ductility and high melting point, such as copper and tantalum.

[0035] Waveform controller 3, such as Figure 5 As shown, the waveform controller 3 is coaxially mounted within the main charge 4, between the detonation mechanism 1 and the shaped charge 5, and is located between the casing 2 and the shaped charge 5. The waveform controller 3 is made of low-velocity explosive (detonation velocity of 4000m / s to 5000m / s) or an inert material with high wave impedance, such as plastic or nylon. By adding a waveform controller in the middle of the main charge 4, when the bottom of the main charge 4 is detonated, the resulting detonation wave will diffract when it passes through the waveform controller made of low-velocity explosive or high wave impedance material. This increases the angle at which the shaped charge 5 collapses, thereby increasing the collapse velocity of the shaped charge 5 and reducing the jet stretching duration.

[0036] Center screw 6 Figure 6 As shown, a central screw 6 is vertically installed at the center of the top of the inner wall of the propellant liner, and its outer surface is threaded. When the propellant liner collapses towards the central axis to form a jet, it moves along the thread on the screw, thus decelerating the jet micro-element and reducing the jet velocity gradient. The central screw 6 is made of high-strength materials, such as tungsten, tantalum, or other metallic materials, or ceramics or other non-metallic materials. When the propellant liner 5 collapses and converges towards the center onto the central screw 6, the central screw 6 does not deform, fail, or break. The deceleration effect of the jet is controlled through the geometric design of the central screw, such as the central screw length L, thread pitch diameter d, number of threads n, thread pitch P, and thread helix angle γ.

[0037] In this embodiment, the preferred thread profile of the central screw is a pipe thread, which facilitates the guidance and flow of the high-speed jet; preferably, the product of the thread pitch and the mean diameter is not less than the product of the average jet diameter and the pitch at twice the blast height under the same charge structure, that is:

[0038] Pd≥Pd'

[0039] In the formula, d' is the average diameter of the jet at twice the blast height under the same charge structure.

[0040] Pressure screw 7 Figure 7As shown, it is a circular structure made of high-strength metal materials, such as tungsten alloy and high-strength steel, used to fix the main charge 4 and the charge liner 5 inside the housing 2, to prevent the main charge 4 and the charge liner 5 from loosening and falling off from the large end of the housing 2.

[0041] The working principle of the shaped charge structure of this invention is as follows: After the detonation mechanism 1 is activated, the main charge 4 is detonated at a single point at the top. The main charge 4 detonates stably, forming a detonation wave that propagates forward. After being shaped by the waveform controller 3, it continues to propagate forward and acts on the shaped charge liner 5. Under the intense impact and compression of the detonation wave, the shaped charge liner 5 is continuously crushed from top to bottom, converging towards the central axis of the shaped charge liner 5. Due to the presence of the central screw 6, the crushed shaped charge liner elements continuously converge on the thread of the central screw 6. Due to the helix angle of the thread of the central screw 6, the velocity of the jet elements is reduced by generating two components along the axial and radial directions of the charge, ultimately achieving the control of the axial velocity gradient of the jet. The reduced axial velocity gradient of the jet after control will prevent necking and breakage under high detonation conditions.

[0042] The following example illustrates this point:

[0043] The shell 2 is a hollow stepped axial cylindrical tube, with the inner diameter of the small-end cylindrical cavity being 10mm and the height being 13mm, used to install the detonation mechanism 1; the inner diameter of the large-end cylindrical cavity being 75mm and the height being 100mm, used to install the main charge 4; the shell 2 is made of LY12 aluminum alloy with a density of 2.78g / cm³. 3 The wall thickness is 5mm. The main charge 4 is cylindrical, with a diameter of 75mm and a height of 95mm. One end of the main charge 4 is a standard cylinder, and the other end has a conical groove. The cone angle, height, and bottom diameter of the inner surface of the conical groove are consistent with the liner. The cone angle of the conical groove is 55°, and the height is 40mm. The main charge 4 uses a material with a density of 1.70g / cm³. 3 The 8701 explosive is compressed using a mature and reliable compression process. Figure 3The shape is shown. The main charge 4 is coaxially mounted inside the housing 2, with its cylindrical bottom surface tightly fitted to the inner bottom surface of the housing 2. The shaped charge shroud 5 is a thin-walled conical structure, with its geometric dimensions controlled by the cone angle, wall thickness, height, and bottom diameter. In this example, the cone angle of the shaped charge shroud is 55°, the bottom diameter is 75mm, the height is 40mm, the wall thickness is 2.5mm, and the material is copper. The shaped charge shroud 5 is coaxially mounted inside the conical groove of the main charge 4, with its outer surface tightly fitted to the inner surface of the main charge 4, and bonded to the main charge 4 with insect varnish. The waveform controller 3 is shaped like a truncated cone, with a height of 10mm, a large end diameter of 30mm, and a small end diameter of 20mm. The waveform controller 3 is coaxially mounted inside the housing 2 with the housing 2, the main charge 4, and the shaped charge shroud 5, with its large end facing the small end of the housing 2, 30mm from the bottom surface of the small end of the housing 2. The waveform controller is made of nylon. The central screw 6 is made of tungsten alloy and is laser-welded to the top of the inner surface of the shaped charge liner. The central screw has threads; its length is 16mm, thread pitch is 4mm, number of threads is 2, pitch is 0.8mm, and helix angle is 30°. The pressure screw 7 is annular, 5mm high, with an outer diameter of 75mm and an inner diameter of 70mm. The pressure screw 7 is made of Q235 steel with a density of 7.85g / cm³. 3 After the main charge 4 and the shaped charge 5 are installed inside the housing, the pressure screw 7 is used to tighten the main charge 4 and the shaped charge 5 to prevent the main charge 4 and the shaped charge 5 from becoming loose or falling off from the large end of the housing.

[0044] The aforementioned 80mm shaped charge structure, even at a detonation height of 6 times, still exhibits good continuity in the shaped charge jet. Figure 8 As shown in (a); in contrast, shaped charge with the same shaped charge structure under the same detonation height conditions has already experienced necking fracture, such as... Figure 8 As shown in (b).

[0045] When applied to a homogeneous armor steel target plate with a thickness of 500mm, the shaped charge structure of this invention can achieve a penetration depth of 420mm, while the shaped charge structure with the same shaped charge has a penetration depth of 310mm. Under the same conditions, the penetration depth of the shaped charge structure of this invention is increased by 35.48%.

[0046] In summary, the above are merely preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A central spiral condensed shaped charge structure comprising an initiating mechanism (1), a housing (2), a main charge (4) and a liner (5), characterized in that, It also includes: a waveform controller (3) and a central screw (6); the shaped charge shroud is conical; Among them, the waveform controller (3) is coaxially installed inside the main charge (4) and located between the detonation mechanism (1) and the shaped charge liner (5); the waveform controller (3) is made of explosive with a detonation velocity lower than that of the main charge or inert material with a wave impedance higher than that of the main charge; The central screw (6) is vertically fixed at the top center of the inner wall of the shaped charge shroud (5). The central screw (6) is made of high-strength metal or non-metal material and has threads on its outer surface. The product of the thread pitch and the pitch of the central screw (6) is not less than the product of the average diameter of the jet at twice the blast height and the pitch under the same charge structure.

2. The structure of claim 1, wherein The waveform controller (3) is a truncated cone with its large end facing the bottom surface of the housing (2).

3. The structure of claim 1 or 2, wherein The waveform controller (3) is made of plastic, nylon or explosives with a detonation velocity of 4000 m / s to 5000 m / s.

4. The structure of claim 1, wherein The thread profile of the center screw (6) is a pipe thread.

5. The structure of claim 1, wherein The center screw (6) is made of tungsten, tantalum or ceramic.

6. The structure of claim 1, wherein The housing (2) is made of aluminum alloy, titanium alloy or polyetheretherketone.

7. The structure of claim 1, wherein The main charge (4) is a high-energy explosive with a stable detonation velocity of not less than 8000 m / s.

8. The structure as described in claim 1 or 7, characterized in that, The aspect ratio of the main charge (4) is 0.8 to 1.

2.

9. The structure as described in claim 1, characterized in that, The medicated cover (5) is made of copper or tantalum.

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