An electric igniter with redundant firing structure

Abstract

The application belongs to the technical field of electric initiation, and particularly relates to an electric ignition device with a redundant ignition structure. The electric ignition device comprises an electrode plug body made of ceramic material, two cylindrical charge chambers which are independent and symmetrical about the axis of the electrode plug body are arranged on the electrode plug body, the two charge chambers are separated by ceramic, the charge chambers can completely wrap the charge in the ceramic of the electrode plug body and are only open at the top, each charge chamber is provided with a pin, a metallized layer on the bottom surface of the electrode plug body is in conduction with each group of pins, a thermistor NTC is arranged between the two metallized layers, and an electrostatic discharge tip air gap is arranged between the metallized layer and the outer circle of the electrode plug body. Under high-voltage electrostatic, the discharge position between the bridge circuit of the electric ignition device and the metal shell is converted to the bottom surface of the electrode plug. The application improves the ignition reliability, solves the problem of electrostatic ignition between the independent charge chambers, and can be adapted to various electric primers with a diameter not less than 8.7 mm and a height not less than 10.7 mm.

Description

Technical Field

[0001] The invention belongs to the technical field of electric ignition devices, and in particular relates to an electric ignition component with a redundant ignition structure. Background Art

[0002] There are many types of electric pyrotechnics used in aerospace and weapon systems from launch to operation. The functions achieved by various types of electric pyrotechnics are different. The two most important basic requirements of electric pyrotechnics are safety and reliability. The safety of electric pyrotechnics ensures the safety of weapon systems during production, loading and unloading, transportation, storage and use. Reliability refers to the completion of predetermined functions as required in actual use of weapon systems.

[0003] As the first ignition element, the electric ignition component is mainly composed of an electrode plug, a semiconductor bridge chip, an initial charge and a main charge. The electrode plug is composed of an assembly positioning hole, a charge chamber, a pin, a positioning pin, an electrode plug body, a metallization layer and a thermistor (NTC). When the electric ignition component is stimulated by an external pulse current, the semiconductor bridge chip in the electric ignition component is rapidly vaporized due to Joule heat and forms a weak plasma discharge under the action of the electric field. The plasma quickly diffuses into the initial charge of the electric ignition component. The irradiated initial charge reaches the ignition point and quickly ignites. The main source of danger that affects the safety of the production, transportation, testing, use, and maintenance of electric ignition products is accidental narrow pulse electrical energy. The most common accidental energy includes static electricity, radio frequency current, etc., which may cause accidental ignition of electric ignition products. Therefore, the safety of electric ignition products is mainly determined by the electric ignition component.

[0004] To reduce production costs and meet performance targets, EPTs typically utilize a single-path semiconductor bridge chip design. If a single semiconductor bridge chip or pyrotechnic agent fails, the EPT will cease to function, rendering the entire weapon system ineffective. However, adopting a dual-path redundant ignition structure significantly improves ignition reliability. However, this design also increases the size of the EPT. Furthermore, EPT reliability and safety often conflict. Using a dual-path redundant semiconductor bridge chip design can lead to electrostatic discharge between the two semiconductor bridge chips (between bridges) causing the EPT to ignite unexpectedly, compromising the safety of the EPT. Summary of the Invention

[0005] The object of the present invention is to provide an electric ignition component with a redundant ignition structure.

[0006] The technical solution for achieving the objectives of the present invention is as follows: an electric ignition component with a redundant ignition structure, comprising an electrode plug body made of ceramic material, provided with two independent cylindrical charge chambers symmetrical about the electrode plug body axis, the two charge chambers being separated by ceramic, capable of completely enclosing the agent within the ceramic of the electrode plug body and open only at the top, each charge chamber being equipped with pins, a metallized layer on the bottom surface of the electrode plug body being electrically connected to each set of pins, and a thermistor (NTC) being provided between the two metallized layers;

[0007] There is an electrostatic discharge tip air gap between the metallized layer and the outer circle of the electrode plug body. Under the condition of high electrostatic voltage, the discharge position between the electric ignition component bridge and the metal shell is transferred to the bottom surface of the electrode plug.

[0008] Furthermore, each charge chamber is provided with a semiconductor bridge chip, an initial charge and a main charge.

[0009] Furthermore, the electric ignition element is assembled in the metal shell, and a single-side gap of 0.3 mm to 0.5 mm is set between the metallized layer and the outer circle of the electrode plug body, that is, the metal shell to which it is directly assembled.

[0010] Furthermore, a positioning pin for assembly positioning is provided on the bottom surface of the electrode plug body.

[0011] Furthermore, the material of the pin and the positioning pin is Kovar alloy 4J33 or 4J34.

[0012] Furthermore, the addition of thermistor NTC meets the safety requirement of 1.5A 2.25W 5min without ignition at a high temperature of 107℃ ambient temperature.

[0013] Furthermore, the aperture of the charge chamber is Φ3.2 to 3.6.

[0014] Furthermore, an assembly positioning hole is provided on the top surface of the electrode plug body.

[0015] Furthermore, the maximum outer diameter of the electric ignition component is Φ8.7mm, the maximum height is 10.7mm, and the maximum pressure it can withstand is 550MPa.

[0016] The electric ignition element is used in an electric ignition tube, an igniter or an electric detonator.

[0017] Compared with the prior art, the present invention has the following significant advantages:

[0018] (1) The electric ignition component is small in size, has strong pressure bearing capacity, and has a wide range of size applications; the maximum outer diameter of the electric ignition component is Φ8.7mm, the maximum height is 10.7mm, and it can withstand a maximum pressure of 550MPa. It can be assembled into various types of electric ignition products with a diameter of not less than Φ8.7mm and a height of not less than 10.7mm.

[0019] (2) It has the advantage of anti-static and can meet the anti-static requirements between the short-circuit leg and the shell in GJB344A-2005 "General Specifications for Insensitive Electric Initiators".

[0020] (3) The non-ignition requirement is widely applicable; without adding a thermistor (NTC) 10, it can meet the non-ignition requirement of 1A1W5min for Class A insensitive initiators in GJB 344A-2005 "General Specification for Insensitive Electric Initiators" and the sub-insensitive requirements in addition to the above requirements, or with the addition of a thermistor (NTC) 10, it can meet the non-ignition requirement of 1.5A2.25W5min at a high temperature of 107℃.

[0021] (4) The electric ignition component has redundant dual ignition charge chambers 6, and the initial charge 3 and main charge 4 contained in each charge chamber 6 are also independent of each other, ensuring that the electric ignition component can complete the ignition function independently or in coordination. The two charge chambers 6 do not affect each other, which also improves the ignition reliability of the electric ignition component. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a partial cross-sectional view of the electric ignition element of the present invention.

[0023] Figure 2 It is a right side view of the electrode plug of the present invention.

[0024] Figure 3 For the present invention Figure 2 AA front section view.

[0025] Figure 4 It is a left side view of the electrode plug of the present invention.

[0026] Figure 5 It is a three-dimensional wireframe diagram of the electrode plug described in the present invention.

[0027] Description of reference numerals:

[0028] 1-electrode plug, 2-semiconductor bridge chip, 3-initial charge, 4-main charge, 5-assembly positioning hole, 6-charging chamber, 7-pin, 8-locating pin, 9-electrode plug body, 10-metallization layer, 11-thermistor NTC. DETAILED DESCRIPTION

[0029] The present invention is further described in detail below with reference to the accompanying drawings.

[0030] The present invention is to design an electric ignition component with redundant ignition structure in response to the ignition reliability and safety requirements of electric ignition products. The core components of the electric ignition component are composed of electrode plug 1, semiconductor bridge chip 2, initial charge 3, main charge 4 (such as Figure 1 and Figure 2As shown), the electrode plug 1 is composed of an assembly positioning hole 5, a charging chamber 6, a pin 7, a positioning pin 8, an electrode plug body 9, a metallized layer 10, and a thermistor (NTC) 11 (as shown). Figure 3 、 Figure 4 、 Figure 5 As shown in FIG, the electrode plug body 9 is made of ceramic. The material of the pin 7 and the positioning pin 8 is Kovar alloy 4J33 or 4J34.

[0031] The electric ignition element of the present invention is suitable for assembly and use in a metal shell. The electrode plug 1 of the electric ignition element has two circular independent reagent charging chambers 6. The charging chambers 6 are designed for ignition redundancy. The two charging chambers 6 are separated by a ceramic electrode plug body 9 to ensure electrostatic safety between the semiconductor bridge chips (bridge-to-bridge) between the two charging chambers 6. A metallization layer 10 is preset at the bottom of the electrode plug 1, wherein the metallization layer 10 is connected and conductive to the pin 7. A gap is set between the metallization layer 10 of the electrode plug 1 and the outer circle of the electrode plug body 1 (the metal shell directly assembled), ensuring electrostatic safety between the pin 7 and the metal shell. Through the above invention, there are two independent charging chambers 6 on an electrode plug 1, and each charging chamber 6 is separately equipped with a semiconductor bridge chip 2, an initial charge 3, and a main charge 4, ensuring that the electric ignition element can complete the ignition function independently or in coordination. The two charging chambers 6 do not affect each other, ensuring the safety between the electric ignition body and the assembled shell, and also improving the redundant ignition reliability of the electric ignition element.

[0032] There is a 0.3mm to 0.5mm air gap between the metallized layer 10 and the outer circumference of the electrode plug 1. When the electric ignition element is assembled in the metal shell, the outer circumference of the electrode plug 1 is in direct contact with the metal shell. Under high static voltage conditions, the high voltage current between the electric ignition element bridge circuit and the metal shell can break down in this gap, and will not break down through the reagent loaded in the charging chamber 6. The innovation lies in: the 0.3mm to 0.5mm air gap in the designed metallized layer 10 can serve as an electrostatic discharge tip. Under high voltage, the discharge position between the electric ignition element bridge circuit and the metal shell is transferred to the bottom surface of the electrode plug 1, thereby preventing the reagent position in the charging chamber 6 from being broken down by static electricity. This air gap has repeatability and self-recovery characteristics, maintaining electrostatic breakdown capability and also meeting the insulation resistance requirements between the electric ignition element and the metal shell.

[0033] The electrode plug body 9 is made of ceramic, a material with excellent heat dissipation, high strength, and high insulation properties. The electrode plug 1 features two independent, symmetrical circular charge chambers 6, each with a diameter of 3.4 mm. These chambers completely enclose the reagent within the ceramic. This encapsulated design increases the reagent's heat dissipation area by over 50% compared to conventional technology, enabling the ignition element to meet the safety requirement of 1A, 1W, and 5min without ignition. Furthermore, a thermistor (NTC) 11 is added to the bottom surface of the electrode plug 1, further ensuring that the ignition element meets the safety requirement of 1.5A, 2.25W, and 5min without ignition at a high ambient temperature of 107°C.

[0034] The electrode plug 1 features two independent, symmetrical circular charge chambers 6, each housing a semiconductor bridge chip 2, an initial charge 3, and a main charge 4. The two chambers 6 are designed independently, with the semiconductor bridge chip 2, initial charge 3, and main charge 4 housed independently within each chamber. The redundant design of the ignition components and reagents significantly improves the reliability of the ignition element.

Claims

1. An electric ignition component with a redundant ignition structure, characterized in that: The invention comprises an electrode plug body (9) made of ceramic material, wherein the electrode plug body (9) is provided with two independent cylindrical charging chambers (6) symmetrical about the axis of the electrode plug body, the two charging chambers being separated by ceramic, the charging chambers (6) being able to completely enclose the medicine in the ceramic of the electrode plug body and only having the top open, each charging chamber being provided with a pin (7), a metallized layer (10) on the bottom surface of the electrode plug body (9) being in electrical contact with each group of pins (7), and a thermistor NTC (11) being provided between the two metallized layers (10); There is an electrostatic discharge tip air gap between the metallized layer (10) and the outer circle of the electrode plug body (9), and under the condition of high static voltage, the discharge position between the electric ignition component bridge and the metal shell is transferred to the bottom surface of the electrode plug.

2. The electric ignition element according to claim 1, characterized in that: Each charge chamber (6) is provided with a semiconductor bridge chip (2), an initial charge (3) and a main charge (4).

3. The electric ignition element according to claim 2, characterized in that: The electric ignition element is assembled in a metal shell, and a gap of 0.3mm to 0.5mm on one side is set between the metallized layer (10) and the outer circle of the electrode plug body (9), that is, the metal shell to which it is directly assembled.

4. The electric ignition element according to claim 3, characterized in that: A positioning pin (8) for assembly positioning is provided on the bottom surface of the electrode plug body (9).

5. The electric ignition element according to claim 4, characterized in that: The material of the pin (7) and the positioning pin (8) is Kovar alloy 4J33 or 4J34.

6. The electric ignition element according to claim 1, characterized in that: Adding thermistor NTC (11) meets the safety requirement of 1.5A 2.25W 5min without ignition at a high temperature of 107℃ ambient temperature.

7. The electric ignition element according to claim 6, characterized in that: The aperture of the charge chamber (6) is Φ3.2-3.

6.

8. The electric ignition element according to claim 7, characterized in that: An assembly positioning hole (5) is also provided on the top surface of the electrode plug body (9).

9. The electric ignition element according to claim 8, characterized in that: The maximum outer diameter of the electric ignition component is Φ8.7mm, the maximum height is 10.7mm, and it can withstand a maximum pressure of 550MPa.

10. Use of the electric ignition element according to any one of claims 1 to 9, characterized in that: For use with electric igniters, igniters or electric detonators.

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