Eccentric initiating explosive device initial ignition device
Through the design of an eccentric pyrotechnic initial ignition device, the use of an eccentric structure and sealing technology solves the problem of pyrotechnic combustion residues conducting the electrode, achieves a high-resistance open-circuit state, and avoids the risk of false triggering and secondary ignition.
Patent Information
- Application Number
- CN202510604333.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-05-12
- Publication Date
- 2025-09-05
AI Technical Summary
After the pyrotechnics are used, the combustion residues of the output agent and the initial explosive can easily conduct electricity to the electrodes, resulting in too low open-circuit resistance and the risk of false triggering or secondary ignition, which may lead to catastrophic consequences, especially in spacecraft and weapon systems.
An eccentric initial ignition device for explosive devices is designed. It adopts an eccentric charge ring and a thin bridge belt energy conversion element, combined with silicone rubber seals to prevent combustion residues from contacting the electrode and ensure electrode disconnection.
It effectively improves the open circuit resistance after the pyrotechnic device is activated, prevents false triggering and secondary ignition, ensures the electrode is disconnected, and meets the resistance requirement of more than 500 ohms.
Smart Images
Figure CN120593571A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to an ignition device for a fire-transmitting device, in particular to an eccentric initial ignition device for a fire-transmitting device. Background Art
[0002] The open-circuit resistance of an pyrotechnic device refers to its own resistance value after the pyrotechnic device completes its ignition and action functions. Normally, after the pyrotechnic device is ignited, the bridge wire / bridge strap energy conversion element welded on the initial end electrode immediately melts, causing the electrode to be in an open-circuit state, and the resistance of the pyrotechnic device increases to infinity. However, the solid residue generated after the combustion of some pyrotechnic agents containing metal ions is conductive and will conduct the electrodes of the pyrotechnic device, greatly reducing the open-circuit resistance after the pyrotechnic device is activated. If the open-circuit resistance of the pyrotechnic device is too small, the circuit may not be completely disconnected, causing the risk of false triggering or secondary ignition. For example, in a spacecraft or weapon system, if the open-circuit resistance of the ignition device does not meet the standard, the residual current may cause catastrophic consequences such as premature ballistic detonation or accidental explosion. In addition, the pyrotechnic devices such as ejection tubes used for airborne infrared and chaff jammers currently in service are required to have an open-circuit resistance greater than 500 ohms after the pyrotechnic device is activated.
[0003] Currently, the main focus of improving the open-circuit resistance of pyrotechnic devices is optimizing them through "gas-tightening structures." For example, these structures employ "spring baffles" or "flaky gas-tightening" to prevent the combustion residue from the pyrotechnic device from conducting to the pyrotechnic device's electrodes. However, these baffles or gas-tightening structures only address the problem of backflow from the combustion residue of the pyrotechnic device's output agent. If the combustion residue of the initial explosive (such as pick-type or magnesium-based explosives, whose combustion products are conductive) that directly contacts the pyrotechnic device's electrodes is also conductive, then the gas-tightening structure will not effectively improve the pyrotechnic device's open-circuit resistance. The solid residue generated by the combustion of pyrotechnic agents containing metal ions is conductive and easily conducts to the pyrotechnic device's electrodes, reducing the pyrotechnic device's open-circuit resistance after activation.
[0004] Therefore, how to solve the problem of the output of explosives after the pyrotechnic device is used and the accumulation of combustion residues of the initial explosive on the conductive electrode is the focus of the pyrotechnic device structural design. Summary of the Invention
[0005] The purpose of the present invention is to provide an eccentric pyrotechnic initial ignition device. The device of the present invention solves the problem of combustion residues after the pyrotechnic output agent acts and flows back to the conductive electrode, and at the same time solves the problem of combustion residues of the pyrotechnic initial detonator accumulating on the conductive electrode, thereby effectively solving the technical problem of too low open-circuit resistance after the pyrotechnic act at the source.
[0006] The purpose of the present invention is achieved through the following technical solutions: An eccentric pyrotechnic initial ignition device, the device includes an electrode plug, a charge ring, a bridge belt transducer and silicone rubber; the bridge belt transducer is connected to the two electrodes in the electrode plug by energy storage welding; after the electrode plug and the charge ring are assembled, they are sealed and connected by silicone rubber; the electrode plug is made by a glass sintering process, and the electrode plug shell and the two electrodes are sintered into an integral structure using a glass sealing body; the ceramic pad and the insulating ring are located above the glass sealing body and are bonded to the electrode plug shell by epoxy resin glue; wherein the end face of the ceramic pad is higher than the electrode plug shell and is used to connect to the charge ring; the charge ring is made of polyphenylene sulfide rod (PPS); the lower end face of the charge ring is designed with a circular hole for connecting to the ceramic pad in the electrode plug; the upper end face of the charge ring is designed with a circular hole for loading initial detonating charge, and this circular hole design It is an eccentric structure, and the center of the circular hole deviates from the center of the charge ring by 1.0mm. The charge ring presses one electrode of the electrode plug to prevent the initial explosive from contacting the electrode; the bridge belt energy conversion element is located on the upper surface of the electrode plug, and its two ends are respectively connected to the two electrodes for electric energy conversion; the overall design of the bridge belt energy conversion element is a "Z"-shaped structure, made of nickel-chromium alloy; when the electrode plug and the charge ring are assembled, silicone rubber is used to seal the connection between the charge ring and the electrode plug to prevent combustion residues from entering an electrode pressed by the charge ring through the gap at the joint; after assembly, the initial explosive is loaded into the charge ring by pressing or coating; the overall assembled initial ignition structure is used as a standard initial ignition module, which is threadedly connected to the main structure of any pyrotechnic product through the external thread of the electrode plug shell to form a modular shape.
[0007] The electrode plug of the eccentric initiator ignition device is composed of an electrode plug shell, a ceramic pad, an insulating ring, a glass sealing body, and an electrode.
[0008] In the eccentric initiating ignition device, the overall width of the bridge-belt energy conversion element is 0.3 mm.
[0009] In the eccentric pyrotechnic initial ignition device, the central section of the bridge belt energy conversion element is designed as a "thin section" structure, and the width of the central section is reduced to 0.18 mm, so that the heat converted from electrical energy is concentrated in the central section.
[0010] The eccentric pyrotechnic initial ignition device has an eccentric distance of 1.0 mm between the initial explosive and the center of the ignition structure when the device is in the initial ignition state, so as to prevent the initial explosive from not contacting one electrode of the pyrotechnic device, that is, the combustion product residue is conductive and does not affect the open circuit resistance of the pyrotechnic device after it is activated.
[0011] 1. The salient features of the present invention are: (1) The charge ring of the present invention is designed as an "eccentric" structure so that one electrode of the pyrotechnic device does not come into contact with the initial explosive.
[0012] (2) The central section of the bridge-belt transducer of the present invention is designed as a "thin section" structure with a width of 0.18 mm, which improves the reliability of the transducer fusing.
[0013] (3) In the present invention, the joint between the electrode plug and the charge ring is sealed with silicone rubber to prevent combustion residues from passing through the gap and contacting the protected electrode.
[0014] 2. The beneficial effects of the present invention are: (1) The initial ignition structure of traditional pyrotechnics is usually a "center-on" structure, that is, the center of the initial explosive charge coincides with the center of the electrode plug. The initial ignition structure of the pyrotechnic designed in the present invention adopts an "eccentric" design, and the charge ring of the initial explosive is designed as an "eccentric structure", so that the charge ring can press one of the two electrodes of the pyrotechnic. Even if the output agent residue flows back or the initial explosive combustion residue accumulates in the charge ring, the residue will not conduct to the electrode, effectively protecting the pyrotechnic electrode from being conducted by the residue of the agent combustion product, thereby improving the open circuit resistance of the pyrotechnic.
[0015] (2) The center of the bridge-belt energy converter designed in the present invention is a "thin segment" structure, which can concentrate the heat of electric energy conversion at the center "thin segment", further increasing the probability of the energy converter melting, and can effectively prevent the problem of the open circuit resistance being too low due to the energy converter not melting.
[0016] (3) The joint between the charge ring and the electrode plug of the present invention is sealed by coating with silicone rubber, further preventing combustion residue from entering the electrode pressed by the charge ring through the assembly gap. Through the above three inventions, even if the solid residue generated by the combustion of the pyrotechnic agent is conductive, it will not affect the open circuit resistance of the pyrotechnic device after it is activated. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 This is a three-dimensional schematic diagram of an eccentric initiating ignition device of an explosive device according to the present invention; Figure 2 yes Figure 1 A plan cross-sectional view of Figure 3 It is a schematic diagram of the three-dimensional structure of the electrode plug in the eccentric ignition device of the present invention; Figure 4 yes Figure 3 A plan cross-sectional view of Figure 5 It is a schematic diagram of the three-dimensional structure of the charge ring in the eccentric ignition device of the present invention; Figure 6 yes Figure 5 A plan cross-sectional view of Figure 7This is a schematic diagram of the "eccentric" three-dimensional effect of the eccentric ignition device of the present invention; Figure 8 yes Figure 7 Plane cross-sectional view of .
[0018] Components in the figure: 1-electrode plug, 2-charging ring, 3-initial explosive, 4-electrode plug shell, 5-ceramic pad, 6-insulating ring, 7-glass sealing body, 8-electrode, 9-bridge belt transducer, 10-silicone rubber. DETAILED DESCRIPTION
[0019] The present invention will be described in detail below with reference to the embodiments shown in the accompanying drawings.
[0020] The present invention presents an eccentric pyrotechnic initial ignition device. Its main structure comprises an electrode plug 1, a charge ring 2, a bridge transducer 9, and silicone rubber 10. The bridge transducer 9 is connected to the two electrodes 8 in the electrode plug 1 via energy storage welding. After assembly, the electrode plug 1 and charge ring 2 are sealed with silicone rubber 10.
[0021] The electrode plug 1 consists of an electrode plug housing 4, a ceramic pad 5, an insulating ring 6, a glass seal 7, and electrodes 8, all common structures used in explosive devices. The electrode plug 1 is manufactured using a glass sintering process, with the glass seal 7 used to sinter the electrode plug housing 4 and two electrodes 8 into a single unit. The ceramic pad 5 and insulating ring 6 are positioned above the glass seal 7 and bonded to the electrode plug housing 4 using epoxy resin adhesive. The end face of the ceramic pad 5 (6.0 mm diameter) protrudes approximately 0.3 mm above the electrode plug housing 4, providing connection to the charge ring 2.
[0022] The charge ring 2 has an outer diameter of 8.0 mm and a thickness of 2.0 mm. It is made of polyphenylene sulfide (PPS) rod. The lower end of the charge ring 2 is designed with a circular hole with a diameter of 6.0 mm and a depth of 0.3 mm for connection to the ceramic pad 5 in the electrode plug 1. The upper end of the charge ring 2 is designed with a circular hole with a diameter of 4.0 mm and a depth of 1.7 mm for loading the initial explosive 3. Unlike traditional structures, this circular hole is designed to be eccentric, with the center of the circular hole offset by 1.0 mm from the center of the charge ring. This design allows the charge ring 2 to press against one electrode 8 of the electrode plug 1, preventing the initial explosive 3 from contacting the electrode 8.
[0023] The bridge-band transducer element 9 is located on the upper surface of the electrode plug 1, and its two ends are connected to the two electrodes 8 respectively, playing the role of electric energy conversion. The overall design of the bridge-band transducer element 9 is a "Z"-shaped structure, and it is made of a nickel-chromium alloy strip (Cr20Ni80) with a thickness of 0.02mm. The overall width of the bridge-band transducer element 9 is 0.3mm. Different from the traditional bridge-band transducer element, the central section of the bridge-band transducer element 9 of the present invention is designed as a "thin section" structure. The width of the central section is reduced to 0.18mm, which can ensure that the heat converted from the electric energy is concentrated in the central "thin section", so that the "thin section" can be melted immediately, preventing the problem of the open-circuit resistance of the pyrotechnic device being too low due to the failure of the transducer element to melt.
[0024] When the electrode plug 1 and charge ring 2 are assembled, the connection between the charge ring 2 and the electrode plug 1 is sealed with silicone rubber 10 to prevent combustion residue from entering the gap at the joint and into the electrode 8 pressed by the charge ring 2. After assembly, the initial explosive 3 is loaded into the charge ring 2 by "pressing" or "painting".
[0025] The assembled initial ignition structure functions as a standard initial ignition module, threadedly connected to the main structure of any pyrotechnic device via the external threads of the electrode plug housing 4, demonstrating its modularity. The initial explosive 3 is 1.0 mm eccentric to the center of the ignition structure, preventing contact between the initial explosive 3 and one of the pyrotechnic device's electrodes 8. Even if the combustion product residue is conductive, it does not affect the open-circuit resistance of the pyrotechnic device after activation. Example
[0026] The present invention provides an eccentric initiating ignition device for explosives, such as Figure 1 As shown, the main structure consists of an electrode plug 1 and a charge ring 2. The initial explosive 3 is loaded into the charge ring 2 by "pressing" or "painting". The overall size after assembly is Ø8×5.6mm. Figure 2 As shown, the electrode plug 1 is composed of an electrode plug shell 4, a ceramic pad 5, an insulating ring 6, a glass sealing body 7, and an electrode 8. The bridge-type energy conversion element 9 is connected to the two electrodes 8 of the electrode plug 1 through energy storage welding. Figure 3 As shown, the charge ring 2 is designed as an "eccentric" structure, with a circular hole of 4.0 mm on the upper end surface for filling the initial explosive 3, and a circular hole of 6.0 mm on the lower end surface for connecting with the ceramic pad 5 in the electrode plug 1. Figure 4 As shown, the overall structure has an eccentric distance of 1.0mm. The "eccentric" design of the charge ring 2 effectively compresses one electrode 8, and the silicone rubber coating also prevents combustion residue from entering the electrode 8 through the gap. In addition, the center section width of the bridge band transducer 9 has been reduced from 0.3mm to 0.18mm, which improves the reliability of the transducer's fusing after power is applied.
[0027] The working principle of the initial ignition structure of the eccentric initiator of the present invention is as follows: When the current is loaded to the two electrodes 8 of the electrode plug 1, the bridge belt energy conversion element 9 quickly receives the electric energy and completes the electrothermal conversion. During the electrothermal conversion process, the "thin segment" structure in the middle position of the bridge belt energy conversion element 9 will melt at the first time due to the concentration of heat, and the heat generated will detonate the initial explosive 3. After the initial explosive 3 burns, a conductive solid residue is immediately generated. However, since one electrode 8 of the electrode plug 1 is pressed by the charge ring 2, the solid residue cannot contact this electrode 8, so the two electrodes 8 in the electrode plug 1 will not be conducted by the solid residue, and the two electrodes 8 are always in an open circuit state. Therefore, the open circuit resistance of the pyrotechnic device will tend to infinity, ensuring the index requirements of the open circuit resistance after the pyrotechnic device is activated.
Claims
1. An eccentric initiating ignition device, characterized in that: The device comprises an electrode plug (1), a charge ring (2), a bridge belt energy conversion element (9) and a silicone rubber (10); the bridge belt energy conversion element (9) is connected to the two electrodes (8) in the electrode plug (1) by energy storage welding; after the electrode plug (1) and the charge ring (2) are assembled, they are sealed and connected by the silicone rubber (10); the electrode plug (1) is made by a glass sintering process, and the electrode plug shell (4) and the two electrodes (8) are sintered into an integral structure by using a glass sealing body (7); the ceramic pad (5 ) and the insulating ring (6) are located above the glass sealing body (7) and are bonded to the electrode plug shell (4) by epoxy resin glue; wherein the end face of the ceramic pad (5) is higher than the electrode plug shell (4) and is used to connect with the charging ring (2); the charging ring (2) is made of polyphenylene sulfide rod (PPS); the lower end face of the charging ring (2) is designed with a circular hole for connecting with the ceramic pad (5) in the electrode plug (1); the upper end face of the charging ring (2) is designed with a circular hole for loading the initial detonator (3), The circular hole is designed as an eccentric structure, and the center of the circular hole deviates from the center of the charge ring by 1.0 mm. The charge ring (2) presses one electrode (8) of the electrode plug (1) to prevent the initial explosive (3) from contacting the electrode (8); the bridge belt energy conversion element (9) is located on the upper surface of the electrode plug (1), and its two ends are respectively connected to the two electrodes (8) for electric energy conversion; the bridge belt energy conversion element (9) is designed as a "Z"-shaped structure and is made of nickel-chromium alloy; the electrode plug (1) and the charge ring (2) are assembled. Under the present invention, silicone rubber (10) is used to seal and coat the connection between the charge ring (2) and the electrode plug (1) to prevent combustion residues from entering an electrode (8) pressed by the charge ring (2) through the gap at the joint; after assembly, the initial explosive (3) is loaded into the charge ring (2) by pressing or coating; the initial ignition structure of the overall assembly serves as a standard initial ignition module, which is threadedly connected to the main structure of any pyrotechnic device through the external thread of the electrode plug shell (4) to form a modular shape.
2. The eccentric initiating ignition device of claim 1, characterized in that: The electrode plug (1) consists of an electrode plug shell (4), a ceramic pad (5), an insulating ring (6), a glass sealing body (7), and an electrode (8).
3. The eccentric initiation ignition device of claim 1, characterized in that: The overall width of the bridge belt energy conversion element (9) is 0.3 mm.
4. The eccentric initiation ignition device of claim 1, characterized in that: The central section of the bridge belt energy conversion element (9) is designed as a "thin section" structure, and the width of the central section is reduced to 0.18 mm, so that the heat converted from electrical energy is concentrated in the central section.
5. The eccentric initiation ignition device of claim 1, characterized in that: In the initial ignition state of the device, the eccentric distance between the initial explosive (3) and the center of the ignition structure is 1.0 mm, which prevents the initial explosive (3) from not contacting one electrode (8) of the pyrotechnic device, that is, the combustion product residue has conductivity and does not affect the open circuit resistance of the pyrotechnic device after it is activated.