Electric ignition part of redundant ignition structure

Abstract

The invention belongs to the technical field of electric initiating explosive devices, and particularly relates to an electric ignition part of a redundant ignition structure. Comprising an electrode plug body made of a ceramic material, the electrode plug body is provided with two independent cylindrical charging chambers which are symmetrical about the axis of the electrode plug body, the two charging chambers are separated by ceramics, all medicaments can be wrapped in the ceramics of the electrode plug body through the charging chambers, only the tops of the charging chambers are open, and each charging chamber is provided with a contact pin. Metalized layers are arranged on the bottom surface of the electrode plug main body and are communicated with each group of contact pins, and a thermistor NTC is arranged between the two metalized layers; an electrostatic discharge tip air gap is formed between the metallization layer and the outer circle of the electrode plug body, and the discharge position between an electric ignition part bridge circuit and the metal shell is converted to the bottom face of the electrode plug under the electrostatic high voltage. According to the electrostatic ignition device, the ignition reliability is improved, the problem of electrostatic ignition between independent charging chambers is solved, and the electrostatic ignition device can be adapted to various electric initiating explosive devices with the diameter not smaller than phi 8.7 mm and the height not smaller than 10.7 mm.

Description

Technical Field

[0001] The invention belongs to the technical field of electric ignition products, 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 use. 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 ignites rapidly. 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] In order to reduce production costs and meet performance indicators, electric pyrotechnics are usually designed with a single-channel semiconductor bridge chip. If a single-channel semiconductor bridge chip or pyrotechnic agent fails, the electric pyrotechnic will not work, causing the entire weapon system to fail. If the electric pyrotechnic adopts a dual-channel redundant ignition structure, the ignition reliability will be significantly improved. However, when the electric pyrotechnic is designed with a dual-channel redundant structure, the size of the electric pyrotechnic will also be larger, and the ignition reliability and safety of the electric pyrotechnic are usually contradictory. When the dual-channel redundant semiconductor bridge chip design is adopted, the electrostatic discharge between the two semiconductor bridge chips (bridge-bridge) may cause the electric pyrotechnic to ignite accidentally, affecting the safety of the electric pyrotechnic. 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 to achieve the purpose of the present invention is: an electric ignition component with redundant ignition structure, including an electrode plug body made of ceramic material, the electrode plug body is provided with two independent cylindrical charging chambers symmetrical about the axis of the electrode plug body, the two charging chambers are separated by ceramic, the charging chambers can wrap all the medicine in the ceramic of the electrode plug body and only the top is open, each charging chamber is equipped with a pin, a metallized layer on the bottom surface of the electrode plug body is connected to each group of pins, and a thermistor NTC is 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 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 part 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, positioning pins for assembly positioning are arranged 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°C ambient temperature.

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

[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 that can be withstood is 550MPa.

[0016] The electric ignition element is used for 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 parts are small in size, strong in pressure bearing capacity, and have a wide range of size applications; the maximum outer diameter of the electric ignition parts is Φ8.7mm, the maximum height is 10.7mm, and the maximum pressure they can withstand is 550MPa. They 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 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 secondary insensitivity requirements other than the above requirements, or with the addition of 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 in conjunction with the accompanying drawings.

[0030] The present invention is aimed at the ignition reliability and safety requirements of electric ignition products, and designs an electric ignition component with a redundant ignition structure. The core components of the electric ignition component are composed of an electrode plug 1, a semiconductor bridge chip 2, an initial charge 3, and a 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 metallization layer 10, and a thermistor (NTC) 11 (as shown Figure 3 , Figure 4 , Figure 5 As shown in FIG. 1 , the electrode plug body 9 is made of ceramic. The plug pin 7 and the positioning pin 8 are made of Kovar alloy 4J33 or 4J34.

[0031] The electric ignition component of the present invention is suitable for being assembled in a metal shell for use. The electrode plug 1 of the electric ignition component has two circular independent medicine charging chambers 6. The charging chambers 6 are ignition redundant design structures. The two charging chambers 6 are separated by the ceramic electrode plug body 9 to ensure the electrostatic safety between the semiconductor bridge chips (bridge-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 with the plug 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 (directly assembled metal shell) to ensure the electrostatic safety between the plug 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, which ensures that the electric ignition component can complete the ignition function alone or in coordination. The two charging chambers 6 do not affect each other, which ensures the safety between the electric ignition body and the assembled shell, and also improves the redundant ignition reliability of the electric ignition component.

[0032] There is an air gap of 0.3mm to 0.5mm between the metallized layer 10 and the outer circle of the electrode plug 1. The electric ignition element is assembled in the metal shell, and the outer circle of the electrode plug 1 is in direct contact with the metal shell. Under the condition of high static electricity, the high voltage current between the bridge circuit of the electric ignition element and the metal shell can break down in this gap, and will not break down through the medicine loaded in the charge chamber 6. Its innovation lies in: the designed air gap of 0.3mm to 0.5mm in the metallized layer 10 can be used as an electrostatic discharge tip. Under high voltage, the discharge position between the bridge circuit of the electric ignition element and the metal shell is transferred to the bottom surface of the electrode plug 1, thereby avoiding the position of the medicine in the charge chamber 6 from being broken down by static electricity. The air gap has repeatability and self-recovery characteristics, maintains the electrostatic breakdown capability, and can also ensure the insulation resistance requirements between the electric ignition element and the metal shell.

[0033] The electrode plug body 9 is made of ceramic material, which has excellent heat dissipation, high strength and high insulation. The electrode plug 1 has two independent and symmetrical circular hole charging chambers 6, and the diameter of the charging chamber 6 is Φ3.4. The charging chamber 6 can wrap all the medicine in the ceramic. The charging chamber 6 is a wrapping design, which increases the heat dissipation area of ​​the medicine by more than 50% compared with the original technology, so that the electric ignition part can meet the safety requirements of 1A1W5min non-ignition, and the bottom surface of the electrode plug 1 is also added with a thermistor (NTC) 11, which can also meet the safety requirements of 1.5A2.25W5min non-ignition at a high temperature of 107°C.

[0034] There are two independent and symmetrical round hole charge chambers 6 on the electrode plug 1, and semiconductor bridge chips 2, initial charge 3, and main charge 4 are independently installed in the charge chambers 6. The two charge chambers 6 are designed independently of each other, and the semiconductor bridge chip 2, initial charge 3, and main charge 4 are independently installed in each charge chamber 6. The ignition components and reagents are redundant design structures, which greatly improves the ignition reliability of the electric ignition parts.

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 are separated by ceramic, the charging chambers (6) can completely enclose the medicine in the ceramic of the electrode plug body and only the top is open, each charging chamber is equipped with a plug pin (7), a metallized layer (10) conductive with each group of plug pins (7) is provided on the bottom surface of the electrode plug body (9), and a thermistor NTC (11) is 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 part is assembled in a metal shell, and a single-side gap of 0.3 mm to 0.5 mm is provided 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 arranged 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°C 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 part is Φ8.7mm, the maximum height is 10.7mm, and the maximum pressure it can withstand is 550MPa.

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

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