Miniature high output capacity non-detonating electric ignition tube

Abstract

The utility model discloses a kind of micro high-output capacity's insensitive electric ignition tube, belong to the technical field of pyrotechnics, including shell (1), in the shell (1) from below to above sequentially provided with insulating sheet (8), electrostatic discharge ring (7) and electrode plug (6), the two pins (61) of the electrode plug (6) from the lower end of shell (1) stretch out shell (1) outside, the upper end surface of the electrode plug (6) is provided with bridge wire (5), the bridge wire (5) is communicated with two pins (61), the upper end surface of electrode plug (6) is provided with charge ring (4), in the charge ring (4) is provided with ignition powder (3), in the upper end surface of the ignition powder (3) is provided with cover sheet (2);The utility model makes the insensitive scheme that satisfies in GJB344A-2020 under the size frame as small as possible, simultaneously has enough big output capacity.

Description

Technical Field

[0001] This utility model relates to the field of pyrotechnics technology, and in particular to a miniature, high-output, insensitive electric ignition tube. Background Technology

[0002] Currently, there is an increasing demand in the industry for miniature electric ignition tubes with a maximum outer diameter of less than φ5.5mm. At the same time, there are requirements for the insulation resistance, electrostatic inductance, safe current, output capacity, and sealing performance of these electric ignition tubes. Traditional insensitive ignition heads have lower ignition reliability due to their inherent manufacturing process, and the ignition heads themselves have low adaptability to the operating environment, especially under mechanical conditions where they are prone to breakage and failure. Compared with this product, the traditional electric ignition tube has two main defects: (1) In such a small size, the traditional aluminum or copper shell electric ignition tube with an internal phenolic electrode plug cannot guarantee the integrity of its own structure after ignition. There is a possibility that the shell will crack or explode, and the internal electrode plug or other structures will fly out, causing additional waste in the large system. (2) More and more general requirements require electric ignition tubes to meet the 107℃ safety current requirement specified in clause 4.6.12.1 of GJB344A-2020. However, the traditional electric ignition tube's charging process, combined with the poor heat dissipation of the phenolic or glass electrode plug, can no longer guarantee 100% that it will pass the safety current test at 107℃.

[0003] Therefore, traditional electric ignition tubes or insensitive ignition heads, due to their inherent structural defects, can no longer meet the application requirements. There is an urgent need in this field for a miniature insensitive electric ignition tube with high output capability. Summary of the Invention

[0004] The purpose of this invention is to provide a miniature, high-output, insensitive electric ignition tube to solve the above-mentioned problems.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows: A miniature, high-output, insensitive electric ignition tube includes a tube shell. Inside the tube shell, from bottom to top, are arranged an insulating sheet, an electrostatic discharge ring, and an electrode plug. Two pins of the electrode plug extend from the lower end of the tube shell. A bridge wire is provided on the upper end face of the electrode plug, and the bridge wire is in communication with the two pins. A propellant ring is provided on the upper end face of the electrode plug, and ignition powder is placed inside the propellant ring. A cover plate is provided on the upper end face of the ignition powder. The upper sides of the cover plate contact the upper inner wall of the tube shell. An opening is also provided at the upper end of the tube shell. The middle portion of the upper end of the cover plate corresponds to the opening, sealing the gaps and openings of the tube shell.

[0006] The electrostatic discharge ring and the insulating sheet are sequentially threaded onto the pins of the electrode plug; The electrode plug and the bridge wire form an electric ignition element, preferably with the bridge wire welded to the end face of the electrode plug; the cover plate is installed inside the tube shell and fixed by the rolled edge of the tube shell.

[0007] Among the above-mentioned components: The tube shell is used to protect and seal the internal structure of the electric ignition tube; the bridge wire is used to quickly heat up and ignite the ignition charge after receiving ignition energy, and to resist stray current, accidental current and other situations that may cause the ignition device to ignite accidentally when it does not receive detonation energy. The electrode plug is preferably a ceramic electrode plug, which is used to fix the insert pin and support the external medicine and internal structure of the electric ignition tube. At the same time, it can quickly dissipate heat when the electric ignition tube receives an unexpected current to avoid accidental ignition. The electrostatic discharge ring is used to establish a safe channel for the electrostatic sensitivity test of the electric ignition tube. By controlling the distance from the pin, it can meet the insulation resistance requirements of the product and release electrostatic sparks when the product foot-shell is subjected to electrostatic impact, thus avoiding the generation of electrostatic sparks at the bridge wire and preventing accidental product ignition. The insulating sheet is used to fix the relative position of the two pins of the electrode plug, and works in conjunction with the function of the electrostatic discharge ring to prevent accidental short circuits in the product. The charge ring is used to increase the insulation strength between the bridge wire and the tube shell, and at the same time to provide some support for the agent; The cover is used for sealing the end of the electric ignition tube, and at the same time protects and supports the internal structure of the electric ignition tube. As a preferred technical solution, an ignition powder is also provided above the charging ring.

[0008] As a preferred technical solution, the shell material is 316L stainless steel, preferably with a passivation treatment known in the art, conforming to standard GB / T 1220-2017, with a thickness of 0.35mm and a maximum outer diameter of φ5.45mm. This material is a commonly used stainless steel in the industry, with moderate hardness, and can be machined or stamped. After surface treatment, it has good resistance to atmospheric corrosion and diluted acids or salts, meeting the requirements for use in harsh environments such as high temperature, low temperature, and humid heat.

[0009] As a preferred technical solution, the material of the charge ring is polyphenylene sulfide, with a thickness of 0.47 mm to 0.48 mm, more preferably 0.475 mm. It conforms to standard GB / T 37194.1-2018, and the material has a volume resistivity of 10 Ω·cm. 10 The theoretical foot-to-shell insulation resistance of the product is calculated to be 4.75 × 10 MΩ·cm. 8MΩ, meeting the industry-standard requirement of greater than 20MΩ. The design of this material as a charging ring for pyrotechnics is a mature industry design, and its reliability, long storage life, and compatibility with pyrotechnic agents have been verified through extensive product testing. Its insulation, material hardness, processability, moisture absorption, and temperature resistance are all superior to traditionally used nylon and phenolic fabric boards.

[0010] The electrode plug is preferably made of ceramic, which improves heat dissipation efficiency by at least 13 times compared to traditional glass electrode plugs, greatly improving the pass rate of the product's safety current test and enabling the product to meet the 107℃ safety current requirement in GJB344A-2020.

[0011] As a preferred technical solution, the ignition charge has a charge weight of 80-1000 mg and a charge diameter of φ3.6 mm to φ4.0 mm. The ignition charge is preferably lead ferrocyanide-potassium perchlorate, and more preferably, the mass ratio of the two is 1:1.

[0012] As a preferred technical solution, the electrostatic discharge ring is a copper ring. The dimensions of the electrostatic discharge ring and the insulating sheet are matched to ensure that the maximum design size of the electrostatic discharge channel is 0.352 mm.

[0013] As a preferred technical solution, sealant is used to seal the gaps and openings of the tube shell. The sealant is used to seal the external gaps of the electric ignition tube, improving its environmental adaptability.

[0014] Compared with the prior art, the advantages of this utility model are as follows: This utility model has made a desensitization scheme that meets the requirements of GJB344A-2020 (i.e., safe current at 107℃, insulation resistance, electrostatic inductance, stray current, etc.) within the smallest possible size framework (maximum outer diameter φ5.45mm, total length ≤7.5mm), while having a sufficiently large output capacity to independently ignite commonly used high-energy ignition propellants such as boron / potassium nitrate and magnesium / polytetrafluoroethylene, which is superior to traditional desensitized ignition heads. Attached Figure Description

[0015] Figure 1 This is an overall structural diagram of the present invention.

[0016] In the diagram: 1. Tube shell; 2. Cover plate; 3. Ignition charge; 4. Charge ring; 5. Bridge wire; 6. Electrode plug; 61. Insert pin; 7. Static discharge ring; 8. Insulating sheet; 9. Sealant. Detailed Implementation

[0017] The present invention will be further described below with reference to the embodiments.

[0018] Example 1:

[0019] A miniature, high-output, insensitive electric ignition tube, see [link / reference]. Figure 1The device includes a shell 1. Inside the shell 1, from bottom to top, are arranged an insulating sheet 8, an electrostatic discharge ring 7, and an electrode plug 6. Two pins 61 of the electrode plug 6 extend out of the shell 1 from the lower end. A bridge wire 5 is provided on the upper end face of the electrode plug 6. The bridge wire 5 is connected to the two pins 61. A charging ring 4 is provided on the upper end face of the electrode plug 6. An ignition charge 3 is placed inside the charging ring 4. In this embodiment, the height of the charging ring is 1.7 mm, which is sufficient to meet the insulation requirements. The remaining space above is used to fill the ignition charge to increase the charge amount. A cover plate 2 is provided on the upper end face of the ignition charge 3. The upper ends of the cover plate 2 are in contact with the upper inner wall of the shell 1. An opening is also provided at the upper end of the shell 1. The middle part of the upper end of the cover plate 2 corresponds to the opening. The gaps and openings of the shell 1 are sealed with sealant 9. In this embodiment, during assembly, the bridge wire 5 is first welded to the end face of the electrode plug 6, and connected to the two pins 61 of the electrode plug 6. Then, the insulating sheet 8, the electrostatic release ring 7, and the electrode plug 6 are sequentially installed into the tube shell 1. The charging ring 4 is bonded to the end face of the electrode plug 6 with epoxy adhesive, and the parts inside the tube shell 1 are pressed tightly. The ignition powder 3 is pressed into the charging ring 4 under a pressure of 100 kg. The cover plate 2 is installed on the ignition powder surface inside the tube shell 1 and the internal parts are pressed tightly by the rolled edge of the tube shell 1 to complete the assembly. The sealant 9 is applied to the gaps on the outside of the tube shell 1 to complete the sealing.

[0020] The loading process in this embodiment is as follows: First, 45mg of ignition charge 3 is loaded into the tube shell 1 through a special loading funnel, and the loading is compressed with 100kg pressure and held for 5s. Then, 45mg of ignition charge 3 is loaded into the tube shell 1 again, and the loading is compressed with 100kg pressure and held for 5s. The loading is done separately twice to ensure the loading density. The ignition propellant in this embodiment is a mixture of lead ferrocyanide and potassium perchlorate, with a mass ratio of 1:1.

[0021] The working principle and process of the above-mentioned insensitive electric ignition tube are as follows: First, the shell 1 and the cover plate 2 can support, protect and seal the internal structure and ignition powder 3; the bridge wire 5 and the electrode plug 6 can resist interference, stray energy and accidental ignition energy; the electrostatic discharge ring 7 can discharge accidental electrostatic shocks. When the initial detonation current is input into the ignition circuit, the bridge wire 5 receives the detonation electrical energy and quickly ignites the ignition charge 3. The ignition charge 3 outputs high-temperature, high-pressure gas and flame, as well as scorching solid particles (the action time is determined by the proportion of the agent, and the output energy is determined by the total amount of the agent under the same proportion, which is common knowledge that can be understood and calculated by those skilled in the art), which breaks through the cover plate 2 and ignites the subsequent charge.

[0022] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A miniature, high-output, insensitive electric ignition tube, characterized in that, The device includes a shell (1), and inside the shell (1) are arranged from bottom to top an insulating sheet (8), an electrostatic discharge ring (7) and an electrode plug (6). The two pins (61) of the electrode plug (6) extend out of the shell (1) from the bottom end. A bridge wire (5) is provided on the upper end face of the electrode plug (6), and the bridge wire (5) is connected to the two pins (61). A charge ring (4) is provided on the upper end face of the electrode plug (6), and an ignition powder (3) is provided inside the charge ring (4). A cover plate (2) is provided on the upper end face of the ignition powder (3). The upper ends of the cover plate (2) are in contact with the upper inner wall of the shell (1). An opening is also provided on the upper end of the shell (1). The middle part of the upper end of the cover plate (2) corresponds to the opening, thus sealing the gaps and openings of the shell (1).

2. The miniature high-output insensitive electric ignition tube according to claim 1, characterized in that, An ignition powder (3) is also placed above the charge ring (4).

3. The miniature high-output insensitive electric ignition tube according to claim 1, characterized in that, The material of the charge ring (4) is polyphenylene sulfide, with a thickness of 0.47 mm to 0.48 mm and a height of 1.7 mm.

4. The miniature high-output insensitive electric ignition tube according to claim 1, characterized in that, The ignition charge (3) has a charge amount of 80-1000mg and a charge diameter of φ3.6mm~φ4.0mm.

5. The miniature high-output insensitive electric ignition tube according to claim 1, characterized in that, The electrostatic discharge ring (7) is a copper ring.

6. The miniature high-output insensitive electric ignition tube according to claim 1, characterized in that, The gaps and openings of the tube shell (1) are sealed with sealant (9).

7. The miniature high-output insensitive electric ignition tube according to claim 1, characterized in that, The shell (1) is made of 316L stainless steel.

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