A non-electric electromagnetic shielding primer

Abstract

The present invention discloses a non-electric electromagnetic shielding primer tube, which relates to the technical field of primer tubes. It includes a housing, and also includes a heat-insulating layer for heat insulation, a carbon fiber shielding cavity for electromagnetic shielding, a firing element for firing, a conductor for controlling the firing of the firing element, and a gap filling mechanism for automatically filling the gap between the conductor and the housing. The carbon fiber shielding cavity is arranged outside the firing element, and powder is filled between the carbon fiber shielding cavity and the firing element. The gap filling mechanism is arranged between the housing and the heat-insulating layer. When the non-electric electromagnetic shielding primer tube is in use, first, a multi-layer packaging structure is adopted, and a carbon fiber shielding cavity is arranged in the packaging layer, which can effectively achieve a wide-range shielding effect on electromagnetic waves. In addition, a gap filling mechanism is additionally provided to avoid the phenomenon that the gap between the conductor and the housing is too large, resulting in electromagnetic waves accidentally entering the interior of the housing.

Description

Technical Field

[0001] The present invention relates to the technical field of igniters, and in particular to a non-electric electromagnetic shielding igniter. Background Art

[0002] An igniter belongs to a type of pyrotechnic device. A pyrotechnic device is a general term for disposable components and devices that contain gunpowder or explosives and generate combustion or explosion after being stimulated by the outside world to ignite gunpowder, detonate explosives, or perform mechanical work.

[0003] Currently, all solid rocket engines in China use electric igniters or electric ignition heads as the ignition system. Relying solely on the rocket engine shell as an electromagnetic shielding wall has very large loopholes (the metal shell cannot be completely enclosed). Using a low-pass filter circuit with a large volume and complex structure also cannot achieve the purpose of eliminating interfering electromagnetic signals in a wide frequency band and to a large extent. Accidental ignition of pyrotechnic equipment still occurs from time to time. There is an urgent need for an electric igniter or ignitor with high safety, high reliability, and strong electromagnetic radiation resistance ability to greatly improve the survival rate and safety of weapon equipment in the combat preparation and combat states under complex electromagnetic environment conditions. Currently, high-value pyrotechnic devices are designed with a low-pass filter safety link on the outside of the electric igniter or ignition device. On the one hand, the low-pass filter link only has shielding ability for low-frequency electromagnetic signals, and the shielding effect is less than 10 dB, and it cannot achieve the ability to resist wide-frequency-band, strong electromagnetic interference signals or electromagnetic pulses. On the other hand, its price is high, its volume is very large, and the ignition link is complex. At the same time, during the use of the existing igniter, due to the influence of its structural principle, there is always a gap between the wire inside the igniter and the outer shell. In the initial stage of use, this gap may be small, but as it is placed or accidentally touched the wire, at this time, the gap between the wire and the outer shell may increase (such a gap is called a non-conductive gap). This gap is prone to electromagnetic leakage. When electromagnetic leakage occurs, the electromagnetic wave will enter the inside of the igniter. When a conductor is in a changing electromagnetic field, an induced current will inevitably be generated. An electro-explosive device generally consists of positive and negative electrodes and an electrothermal device (bridge wire). When an induced current passes through the electrothermal device, it will cause the bridge wire to heat up. When the current is large enough, the heat generated by the bridge wire will ignite the ignition charge, causing the electro-explosive device to explode. When the electro-explosive device is exposed to electromagnetic radiation, a potential difference will be formed at both ends of the bridge wire for a long time. When the electromagnetic wave field strength is large enough, a strong current will be generated to make the igniter fire, affecting the normal use of ammunition pyrotechnics and causing extremely serious consequences. Summary of the Invention

[0004] The technical solution of the present invention aims at the technical problem that the existing technical solutions are too single, and provides a solution significantly different from the existing technologies. Embodiments of the present invention provide a non-electric electromagnetic shielding primer to solve the technical problems that the existing primer has poor electromagnetic shielding effect and there will be a gap between the conductor and the housing during the use of the primer, resulting in the occurrence of ignition phenomena.

[0005] Embodiments of the present invention adopt the following technical solutions: A non-electric electromagnetic shielding primer, including a housing, further including a heat insulation layer for insulating heat, a carbon fiber shielding cavity for shielding electromagnetic waves, an ignition element for ignition, a conductor for controlling the ignition of the ignition element, and a gap filling mechanism for automatically filling the gap between the conductor and the housing. The carbon fiber shielding cavity is disposed outside the ignition element, and powder is filled between the carbon fiber shielding cavity and the ignition element. The carbon fiber shielding cavity is wrapped with a heat insulation layer, and the housing is disposed outside the heat insulation layer. A conductor is connected through the housing between the ignition element and the housing. The gap filling mechanism is disposed between the housing and the heat insulation layer.

[0006] Further, the ignition element adopts a standard ignition element, the housing is processed and formed by a metal material, and the powder adopts a common ignition agent.

[0007] Further, the carbon fiber shielding cavity adopts a high electrical conductivity flexible carbon fiber film.

[0008] Further, the heat insulation structure adopts a high silica or phenolic composite material.

[0009] Further, the gap filling mechanism includes an extrusion cavity, the extrusion cavity is sleeved outside the conductor, and the extrusion cavity is located between the housing and the heat insulation layer. One end of the extrusion cavity is provided with a plurality of heat conducting plates, and the heat conducting plates penetrate into the powder. The other end of the extrusion cavity is provided with a bottom plate, and a connecting pipe penetrates through the bottom plate, and the other end of the connecting pipe is connected to an expansion cavity. A connecting sleeve is disposed between the collision cavity and the conductor, and the connecting sleeve penetrates through the housing. An extrusion plate is disposed in the extrusion cavity, an extrusion block is disposed on the other side of the extrusion plate, and an expansion memory metal is disposed between the extrusion plate and the heat conducting plate. A sliding groove is opened on the inner side of the bottom plate, and a blocking block is slidably connected to the inner side of the bottom plate.

[0010] Further, the expansion cavity is filled with a hydraulic gel material, such as a water-soluble polyurethane grouting material, which can form a uniform and dense consolidation body within dozens of seconds when it encounters water, thereby filling the gap between the conductor and the housing.

[0011] Further, two different properties of liquids are respectively filled in the extrusion plate, one side is water and the other side is alcohol, and the alcohol wraps the expansion memory metal.

[0012] Further, the contact surface between the extrusion block and the blocking block is an inclined surface.

[0013] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0014] First, the present invention adopts a flexible carbon fiber integrally formed shielding cavity, encapsulates the firing element and the ignition agent of the electric detonator in the carbon fiber shielding cavity, and then encapsulates them together in the composite heat protection structure of the electric detonator. Even if the firing element is physically isolated from the shielding cavity, it also achieves the purpose of electromagnetic shielding for the electric detonator. It can achieve a wide range of shielding capabilities for strong electromagnetic radiation signals from KHz to 50 GHz, with a significant attenuation of electromagnetic waves reaching 30 dB to 60 dB, greatly improving the safety of the detonator and effectively preventing accidental ignition of pyrotechnic equipment and solid rocket engines or malicious electromagnetic damage.

[0015] Second, a gap filling mechanism is provided between the conductor and the housing. Initially, the gap between the conductor and the housing may be small, but during the installation of the body, the conductor may be accidentally touched, causing the position of the conductor to shift, or the conductor may be subject to aging and corrosion, ultimately increasing the gap between the conductor and the housing. At this time, when the electromagnetic enters the inside of the housing, the firing element generates heat under the influence of the electromagnetic signal. At this time, the heat of the firing element is not sufficient to ignite the powder, and the heat enters the extrusion cavity through the heat conducting plate, causing the shape memory metal and alcohol to expand and squeeze the extrusion plate simultaneously. The extrusion plate moves to initially move the stopper, and at this time, the connection nozzle opens, and the liquid enters the expansion cavity through the connecting pipe, causing the hydraulic gel material in the expansion cavity to solidify. Initially, the hydraulic gel material is in a liquid state and can thus enter the gap. When it comes into contact with water and solidifies, it can fill the gap, thereby preventing the electromagnetic from entering the housing due to an excessive gap between the conductor and the housing. Moreover, at the initial stage, the connection nozzle is in a closed state under the action of the stopper, and at this time, the liquid does not flow. Only when the firing element accidentally generates heat will the stopper move;

[0016] In summary, when the device is in use, it first adopts a multi-layer encapsulation structure, and a carbon fiber shielding cavity is provided in the encapsulation layer, which can effectively achieve a wide range of shielding effects on the electromagnetic. In addition, a gap filling mechanism is added, which can prevent the phenomenon that the electromagnetic accidentally enters the inside of the housing due to an excessive gap between the conductor and the housing. Description of the Drawings

[0017] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the following drawings are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0018] Figure 1 Schematic diagram of the main structure of the present invention;

[0019] Figure 2 Schematic diagram of the internal structure of the housing of the present invention;

[0020] Figure 3 Schematic diagram of the position structure of the gap filling mechanism of the present invention;

[0021] Figure 4 Schematic diagram of the internal first perspective structure of the gap filling mechanism of the present invention;

[0022] Figure 5 Schematic diagram of the internal second perspective structure of the gap filling mechanism of the present invention;

[0023] Figure 6 Schematic diagram of the internal third perspective structure of the gap filling mechanism of the present invention.

[0024] Reference numerals:

[0025] 1. Housing; 11. Heat insulation layer; 12. Carbon fiber shielding cavity; 13. Ignition element; 14. Conductor; 2. Gap filling mechanism; 21. Expansion cavity; 22. Connecting pipe; 23. Extrusion block; 24. Extrusion cavity; 25. Heat conducting plate; 26. Shape memory alloy for expansion; 27. Extrusion plate; 28. Stop block; 29. Slide groove; 210. Bottom plate; 211. Connecting sleeve. Detailed implementation manners

[0026] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention.

[0027] Generally, the components of the embodiments of the present invention described and shown in the accompanying drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents the selected embodiments of the present invention.

[0028] All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0029] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0030] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "installed", "connected", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0031] As shown below in combination with Figures 1 to 6 The embodiment of the present invention provides a non-electric electromagnetic shielding ignition tube, which includes a housing 1, and also includes a heat insulation layer 11 for insulating heat, a carbon fiber shielding cavity 12 for shielding electromagnetic waves, an ignition element 13 for ignition, a conductor 14 for controlling the ignition of the ignition element 13, and a gap filling mechanism 2 for automatically filling the gap between the conductor 14 and the housing 1. The carbon fiber shielding cavity 12 is arranged outside the ignition element 13, and powder is filled between the carbon fiber shielding cavity 12 and the ignition element 13. The carbon fiber shielding cavity 12 is wrapped with a heat insulation layer 11, the heat insulation layer 11 is provided with a housing 1 outside, the ignition element 13 and the housing 1 are connected through the conductor 14, and the gap filling mechanism 2 is arranged between the housing 1 and the heat insulation layer 11.

[0032] When the device is in use, first, a multi-layer packaging structure is adopted, and the carbon fiber shielding cavity 12 is arranged in the packaging layer, which can effectively shield the electromagnetic waves in a large range. In addition, a gap filling mechanism 2 is additionally provided to avoid the phenomenon that the gap between the conductor 14 and the housing 1 is too large, resulting in electromagnetic waves accidentally entering the inside of the housing 1.

[0033] Specifically, the ignition element 13 adopts a standard ignition element 13, the housing 1 is processed and formed by using a metal material, and the powder adopts a common ignition agent.

[0034] Specifically, the carbon fiber shielding cavity 12 adopts a high electrical conductivity flexible carbon fiber film.

[0035] During operation, the shielding effect of this material is good.

[0036] Specifically, the heat insulation structure is made of high silica or phenolic composite materials.

[0037] During operation, this material has good heat insulation effect.

[0038] Specifically, the gap filling mechanism 2 includes an extrusion cavity 24. The extrusion cavity 24 is sleeved outside the conductor 14, and the extrusion cavity 24 is located between the housing 1 and the heat insulation layer 11. One end of the extrusion cavity 24 is provided with a plurality of heat conducting plates 25, and the heat conducting plates 25 penetrate into the powder. The other end of the extrusion cavity 24 is provided with a bottom plate 210, and a connecting pipe 22 penetrates through the outside of the bottom plate 210. The other end of the connecting pipe 22 is connected to an expansion cavity 21. A connecting sleeve 211 is arranged between the collision cavity and the conductor 14, and the connecting sleeve 211 penetrates through the housing 1. An extrusion plate 27 is arranged in the extrusion cavity 24. An extrusion block 23 is arranged on the other side of the extrusion plate 27. An expansion memory metal 26 is arranged between the extrusion plate 27 and the heat conducting plate 25. A chute 29 is formed on the inner side of the bottom plate 210, and a stop block 28 is slidably connected to the inner side of the bottom plate 210.

[0039] Specifically, the expansion cavity 21 is filled with a hydraulic gel material.

[0040] Specifically, the two sides of the extrusion plate 27 are filled with two different liquids. One side is water, and the other side is alcohol. The alcohol wraps the expansion memory metal 26.

[0041] Specifically, the contact surface between the extrusion block 23 and the stop block 28 is an inclined surface.

[0042] Specifically, when the extrusion block 23 abuts against the stop block 28, it can cause the initial movement of the stop block 28.

[0043] Working principle: The present invention adopts a flexible carbon fiber integrally formed shielding cavity to encapsulate the firing element and ignition agent of the electric ignition tube in the carbon fiber shielding cavity 12, and then encapsulates them together in the composite heat protection structure of the electric ignition tube. Even if the firing element is physically isolated from the shielding cavity, the purpose of electromagnetic shielding of the electric ignition tube is achieved at the same time. It can achieve a wide range of shielding capabilities for strong electromagnetic radiation signals from KHz to 50 GHz, with a significant attenuation of electromagnetic waves reaching 30 dB to 60 dB. At the same time, during the use process, a gap filling mechanism 2 is provided between the conductor 14 and the housing 1. In the initial stage, the gap between the conductor 14 and the housing 1 may be small, but when installing the body, the conductor 14 may be accidentally touched, causing the position of the conductor 14 to shift, or the conductor 14 may be affected by aging and corrosion, ultimately resulting in an increase in the gap between the conductor 14 and the housing 1. At this time, when electromagnetic enters the inside of the housing 1, the firing element generates heat under the influence of the electromagnetic signal. At this time, the heat of the firing element is not sufficient to ignite the powder, and the heat enters the extrusion cavity 24 through the heat conducting plate 25, causing the expansion memory metal 26 and alcohol to expand and squeeze the extrusion plate 27 simultaneously. The movement of the extrusion plate 27 drives the extrusion block 23 to move synchronously. The extrusion block 23 abuts against the stop block 28, causing the stop block 28 to move along the direction of the sliding groove 29. At this time, the opening of the connecting pipe 22 blocked by the stop block 28 is opened, and the liquid enters the expansion cavity 21 through the connecting pipe 22, causing the hydraulic gel material in the expansion cavity 21 to solidify. In the initial stage, the hydraulic gel material is in a liquid state, so it can enter the gap. When it encounters water and solidifies, it can play a role in filling the gap, thereby preventing the gap between the conductor 14 and the housing 1 from being too large and causing electromagnetic to enter the housing 1. Moreover, in the initial stage, the opening of the connecting pipe 22 is in a closed state under the action of the stop block 28, and at this time the liquid does not flow. Only when the firing element accidentally generates heat will the stop block 28 move.

[0044] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A non-electric electromagnetic shielding firing tube, comprising a housing (1), characterized in that; It also includes a heat-insulating layer (11) for insulating heat, a carbon fiber shielding cavity (12) for shielding electromagnetic waves, a firing element (13) for firing, a conductor (14) for controlling the firing of the firing element (13), and a gap filling mechanism (2) for automatically filling the gap between the conductor (14) and the housing (1). A carbon fiber shielding cavity (12) is provided outside the firing element (13), and powder is filled between the carbon fiber shielding cavity (12) and the firing element (13). The carbon fiber shielding cavity (12) is wrapped with a heat-insulating layer (11), and a housing (1) is provided outside the heat-insulating layer (11). A conductor (14) is connected through the firing element (13) and the housing (1). The gap filling mechanism (2) is provided between the housing (1) and the heat-insulating layer (11). The gap filling mechanism (2) includes an extrusion cavity (24). The extrusion cavity (24) is sleeved outside the conductor (14), and the extrusion cavity (24) is located between the housing (1) and the heat-insulating layer (11). One end of the extrusion cavity (24) is provided with a plurality of heat-conducting plates (25), and the heat-conducting plates (25) penetrate into the powder. The other end of the extrusion cavity (24) is provided with a bottom plate (210), and a connecting pipe (22) is connected through the bottom plate (210). The other end of the connecting pipe (22) is connected to an expansion cavity (21). A connecting sleeve (211) is provided between the expansion cavity (21) and the conductor (14), and the connecting sleeve (211) penetrates into the housing (1). An extrusion plate (27) is provided in the extrusion cavity (24). An extrusion block (23) is provided on the other side of the extrusion plate (27). An expansion memory metal (26) is provided between the extrusion plate (27) and the heat-conducting plates (25). A sliding groove (29) is formed inside the bottom plate (210). A blocking block (28) is slidably connected inside the bottom plate (210). The expansion cavity (21) is filled with a hydraulic gel material. Two different liquids are filled on both sides of the extrusion plate (27). One side is water, and the other side is alcohol. The alcohol wraps the expansion memory metal (26).

2. The non-electric electromagnetic shielding ignition tube according to claim 1, wherein; The firing element (13) adopts a standard firing element, the housing (1) is processed and formed by using a metal material, and the powder adopts a common ignition agent.

3. The non-electric electromagnetic shielding primer as claimed in claim 1, wherein; The carbon fiber shielding cavity (12) adopts a high electrical conductivity flexible carbon fiber film.

4. A non-electric electromagnetic shielding ignition tube according to claim 1, characterized in that; The heat-insulating layer (11) adopts a high silica or phenolic composite material.

5. The non-electric electromagnetic shielding primer as claimed in claim 1, wherein; The contact surface between the extrusion block (23) and the blocking block (28) is an inclined surface.

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