An ablatable non-energized igniter for small solid rocket motors

Abstract

The utility model provides a kind of ablation insensitive ignition device for small solid rocket engine, including ablation shell, ablation shell cover, ignition black powder bag, ignition cable, insensitive charge and insensitive semiconductor bridge. Insensitive charge is called in ablation shell cavity, and insensitive semiconductor bridge bridge body is dipped in a layer of trinitrophenol lead ignition powder, is contained in ignition black powder bag, and is integrally placed in the middle position in insensitive charge, ablation shell cover is adhered with ablation shell, and after ignition cable is short-circuited, it is prethreaded from the ablation shell cover and the ablation shell closure place, and is integrally sealed and adhered at the point of threading. The material of ablation shell is combustible non-metallic material celluloid, the shape is small cylinder at bottom, upper large cylinder, and the inclined wall between size cylinder is over, and the whole shell is extracted to large opening upward. The utility model ignition device structure is simple, and the whole shell is quickly ablated after ignition, without accompanying hard damage object injection, convenient to use, low in cost.

Description

Technical Field

[0001] This utility model belongs to the field of pyrotechnics technology of weaponry and equipment, specifically relating to a meltable insensitive ignition device for a small solid rocket engine. Background Technology

[0002] The ignition device is a crucial component of a small solid rocket motor. Based on the overall structural design and performance requirements of the small solid rocket motor, the ignition device differs primarily in its external shape, installation method and location, shell material, ignition wire exit method, propellant composition, and insensitive ignition element. Its function is to ignite the propellant within a sealed cavity under a specified excitation energy stimulus and within a specified time, establishing a specified pressure to generate a high-energy jet flame or jet that acts on the surface of the solid propellant. The propellant burns according to a predetermined combustion method and speed, thereby activating the solid rocket motor.

[0003] Currently, there are two mature systems for insensitive propellant charges in ignition devices: the boron-potassium nitrate system and the magnesium-PTFE system, which are mixed according to weight ratios. Insensitive igniters also come in two types: insensitive semiconductor bridges and insensitive igniters. Both the bridge and the igniter require a layer of ignition propellant. The propellant casing is made of two materials: metallic materials (alloy steel, aluminum alloy, metal mesh, etc.) and non-metallic materials (celluloid, plastic, cotton paper, etc.). Metallic ignition devices are more widely used due to their strength. However, the residue or unmelted fragments formed by the melting of the metallic casing can be carried by the high-speed combustion gas flow and scour the nozzle, potentially causing blockage and engine malfunction. Non-metallic materials, on the other hand, carbonize and dissolve into powder during combustion, disappearing from the nozzle. Using a meltable casing ensures the airtightness of the propellant space and fundamentally eliminates the drawbacks and potential dangers of combustion products after ignition. In solid rocket motors with solid propellant, especially those with long-tail nozzles, nozzles with vectoring devices, limited installation space, and a requirement that there be no hard residues other than the combustion residue of the propellant itself after combustion, non-metallic ignition devices perfectly solve this contradiction. Utility Model Content

[0004] To address the aforementioned problems, the purpose of this utility model is to provide a meltable insensitive ignition device for a small solid rocket engine, which achieves a design that is identical to the installation space, increases the ignition charge while improving ignition performance, and rapidly melts the ignited shell.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows: A meltable insensitive ignition device for a small solid rocket motor includes a meltable shell, a meltable shell cover, an ignition black propellant pack, an ignition cable, an insensitive propellant charge, and an insensitive semiconductor bridge. The inner cavity of the meltable shell contains the insensitive propellant charge. The insensitive semiconductor bridge body is coated with a layer of trinitrocellulose lead ignition propellant and is contained in the ignition black propellant pack, and is integrally placed in the center of the insensitive propellant charge. The meltable shell cover is fastened and bonded to the meltable shell. The ignition cable is short-circuited and pre-exits from the fastening point between the meltable shell cover and the meltable shell, and is sealed and bonded as a whole at the exit point.

[0006] Furthermore, the ablable shell is made of flammable non-metallic celluloid material, and is shaped as a small cylinder at the bottom and a large cylinder at the top, with a sloping transition between the two cylinders. The shell is drawn to form a large opening facing upwards, and the wall thickness is 0.3mm to 0.5mm.

[0007] The meltable shell is made of flammable non-metallic material celluloid, and is cylindrical in shape with a wall thickness of 0.3mm to 0.5mm.

[0008] The ignition black powder packet is made by wrapping 5 milligrams of black powder in fine cotton gauze.

[0009] The ignition cable uses a flexible, multi-strand, high-temperature resistant insulated wire with a cross-sectional area of ​​not less than 0.15 mm². 2 .

[0010] The insensitive charge uses a magnesium-polytetrafluoroethylene system, comprising 1g of HY-6 black powder, 1.5g-2g of 200-particle-size magnesium powder, and 1.5g-2g of polytetrafluoroethylene powder.

[0011] The insensitive semiconductor bridge has wires soldered to both ends of the bridge body and is connected to the ignition cable through bridge plates or bridge wires.

[0012] Compared with existing technologies, the advantages of this utility model are: the ignition device and installation space are designed in the same shape, resulting in a simple structure. After ignition, the entire casing melts rapidly without the ejection of any accompanying hard or damaging material, making it convenient to use and cost-effective. It employs insensitive propellant and insensitive igniter, ensuring operational safety by not igniting under 1A 1W 5min electrical energy stimulation, while reliably igniting under specified energy stimulation. Attached Figure Description

[0013] Figure 1 This is a front view of a small solid rocket motor with a meltable insensitive ignition device according to the present invention; Figure 2 for Figure 1 Left view; Figure 3 for Figure 1 Right view; Figure 4 for Figure 1 Sectional view; Figure 5 for Figure 1 Install the sectional view. Detailed Implementation

[0014] The technical solution of this utility model will be clearly and completely described below with reference to the accompanying drawings and specific embodiments.

[0015] like Figure 1-5 As shown, the present invention relates to a small solid rocket motor igniter 7 with a meltable insensitive ignition device, comprising a meltable shell 1, a meltable shell cover 2, an ignition black propellant pack 3, an ignition cable 4, an insensitive propellant 5, and an insensitive semiconductor bridge 6. The inner cavity of the meltable shell 1 contains the insensitive propellant 5. The insensitive semiconductor bridge 6 is coated with a layer of trinitrocellulose lead ignition propellant and contained within the ignition black propellant pack 3, and is integrally placed in the center of the insensitive propellant 5. The meltable shell cover 2 is fastened and bonded to the meltable shell 1. The ignition cable 4 is short-circuited and pre-exits from the fastening point between the meltable shell cover 2 and the meltable shell 1, and is sealed and bonded at the exit point. Figure 5 As shown, during installation, a layer of sealing adhesive is applied to the small circumference and outer inclined wall 9 of the insensitive igniter 7 and placed in the inner cavity formed by the non-metallic inner liner 8 of the engine nozzle to achieve the same type of installation. The distance between the large end face of the insensitive igniter 7 and the end face of the charge 10 is between 2mm and 3mm.

[0016] The ablation shell 1 is made of flammable non-metallic celluloid material, which is not easy to absorb moisture. It is shaped as a small cylinder at the bottom and a large cylinder at the top, with a sloping transition between the two cylinders. The whole shell is drawn into a large opening facing upwards, with a wall thickness of 0.3mm to 0.5mm.

[0017] The meltable shell cap 2 is made of flammable non-metallic material celluloid, which is not easy to absorb moisture. It is cylindrical in shape and has a wall thickness of 0.3mm to 0.5mm.

[0018] The ignition black powder packet 3 is made by wrapping approximately 5 milligrams of small black powder particles in fine cotton gauze.

[0019] The ignition cable 4 is a flexible multi-strand high-temperature resistant insulated wire with a cross-sectional area of ​​not less than 0.15 mm². 2 .

[0020] The insensitive charge 5 uses a magnesium-polytetrafluoroethylene system, specifically 1g of HY-6 black powder, 1.5g-2g of 200-particle-size magnesium powder, and 1.5g-2g of polytetrafluoroethylene powder. All of these are mature agents with controllable costs.

[0021] The insensitive semiconductor bridge 6 is a semiconductor device with wires soldered to both ends of the bridge body. It connects to the ignition cable via bridge plates or wires. The technology is mature and the cost is controllable. Its performance ensures operational safety by not igniting under 1A 1W 5min electrical energy stimulation, while reliably igniting under specified energy stimulation.

[0022] The working process of a meltable insensitive ignition device for a small solid rocket motor, which relates to this utility model, is as follows: During the operation, ignition cable 4 was always in a short-circuit state, ensuring the safety of the insensitive ignition device.

[0023] During operation, after receiving the ignition command and energy from the missile, the insensitive semiconductor bridge 6 ignites the ignition black powder pack 3, which in turn ignites the insensitive charge 5 within a specified time. The resulting high-temperature gas breaks down and melts the shell, and after establishing a specified pressure in the sealed cavity, a high-energy jet flame or jet is generated that acts on the surface of the solid propellant charge. The charge burns according to the predetermined combustion method and speed, and the combustion products are ejected with the high-temperature, high-speed gas flow. The solid rocket engine operates normally, providing acceleration propulsion for the missile.

Claims

1. A meltable insensitive ignition device for a small solid rocket motor, characterized in that, It includes a meltable shell (1), a meltable shell cover (2), an ignition black powder pack (3), an ignition cable (4), an insensitive charge (5), and an insensitive semiconductor bridge (6); the inner cavity of the meltable shell (1) is filled with the insensitive charge (5), the insensitive semiconductor bridge (6) is coated with a layer of trinitrocellulose lead ignition powder, is contained in the ignition black powder pack (3), and is placed in the center of the insensitive charge (5). The meltable shell cover (2) is fastened and bonded to the meltable shell (1). The ignition cable (4) is short-circuited and pre-exits from the fastening point between the meltable shell cover (2) and the meltable shell (1), and is sealed and bonded together at the point of protrusion.

2. The atomizing insensitive igniter for a small solid rocket motor according to claim 1, characterized in that, The ablation shell (1) is made of flammable non-metallic celluloid material, and is shaped as a small cylinder at the bottom and a large cylinder at the top, with a transition between the large and small cylinders by sloping walls. The shell is drawn up to form a large opening facing upwards, with a wall thickness of 0.3mm to 0.5mm.

3. The atomizing insensitive ignition device for a small solid rocket motor according to claim 1, characterized in that, The meltable shell cap (2) is made of flammable non-metallic material celluloid, and is cylindrical in shape with a wall thickness of 0.3mm to 0.5mm.

4. The atomizing insensitive ignition device for a small solid rocket motor according to claim 1, characterized in that, The ignition black powder packet (3) is made by wrapping 5 mg of small black powder particles in fine cotton gauze.

5. The atomizing insensitive ignition device for a small solid rocket motor according to claim 1, characterized in that, The ignition cable (4) is made of flexible multi-strand high-temperature resistant insulated wire with a cross-sectional area of ​​not less than 0.15 mm². 2 .

6. The atomizing insensitive ignition device for a small solid rocket motor according to claim 1, characterized in that, The insensitive semiconductor bridge (6) has wires welded to both ends of the bridge body and is connected to the ignition cable through bridge plates or bridge wires.

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