CN110953934B - High-temperature-resistant insensitive electric detonator and charging sequence - Google Patents
High-temperature-resistant insensitive electric detonator and charging sequence Download PDFInfo
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- CN110953934B CN110953934B CN201911311659.8A CN201911311659A CN110953934B CN 110953934 B CN110953934 B CN 110953934B CN 201911311659 A CN201911311659 A CN 201911311659A CN 110953934 B CN110953934 B CN 110953934B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
- F42B3/00—Blasting cartridges, i.e. case and explosive
- F42B3/10—Initiators therefor
Abstract
The invention discloses a high-temperature resistant insensitive electric detonator and a charging sequence, wherein the electric detonator comprises an electric ignition tube, an electric detonator shell and a reinforcing cap which are coaxially connected; the electric ignition tube comprises an electric ignition tube shell, wherein the inside of the lower end of the electric ignition tube shell is filled with superfine particle magnesium ignition powder and fine particle magnesium ignition powder from top to bottom, the superfine particle magnesium ignition powder wraps the bridge wire, and the surface of the fine particle magnesium ignition powder is coated with high-temperature resistant protective paint; the reinforcing cap is filled with carbon black/potassium nitrate working powder; the shell of the electric ignition tube, the bridge wire, the superfine particle magnesium ignition powder, the fine particle magnesium ignition powder, the high temperature resistant protective paint, the carbon black/potassium nitrate working powder and the reinforcing cap form a fire transfer sequence. The high-temperature-resistant insensitive electric detonator and the charging sequence provided by the invention realize the reliable ignition-fire transmission functional design, and the charging sequence can also resist the temperature of 230 ℃, thereby solving the problem that the charging sequence of the existing electric detonator cannot resist the high temperature.
Description
Technical Field
The invention relates to the technical field of electric detonators, in particular to a high-temperature-resistant insensitive electric detonator and a charging sequence.
Background
The electric detonator is an initiating explosive actuating device for providing a separation power source for separating devices such as a separation nut and an unlocking bolt, and generally comprises an energy conversion element and a charging sequence.
The charging technology refers to related technologies such as component characteristics, charging sequence structures, energy input structures, energy output structures and charging processes of all medicaments used in a priming device.
At present, in some special launching tasks, such as the requirement that an external position smoke fire device on a deep space cruising spacecraft must bear a larger temperature range which is up to 200 ℃, the minimum temperature of decomposition, spontaneous combustion and melting of the fire and explosive should be at least 30 ℃ higher than the predicted maximum using temperature in consideration of certain safety temperature allowance and the relevant regulation in the general specification of the aerospace firer device, so that design and verification of the high-temperature resistant electric explosion tube capable of resisting 230 ℃ and the explosive loading thereof are necessary.
The charging sequence of the existing electric detonator usually contains stevensine acid lead, black powder, 2/1 camphor and other medicaments. The lead stevensonate is a common bridgewire ignition charge, the 5-second explosion point of the lead stevensonate is 267 ℃, the lead stevensonate generally contains a crystal water, the crystal water is removed after the lead stevensonate is heated to 115 ℃ for 16 hours, the crystal water is rapidly dehydrated at 145 ℃ for 3 hours, and the phenomena of thermal decomposition, color change, weight loss, crystal crushing, adhesive melting or decomposition, adhesive migration and the like can also occur, so that the medicament has adverse reaction hidden danger in a high-temperature environment, and meanwhile, the lost crystal water can further destroy the stability of other medicaments in the device and the structural sealing property of an actuating device; the black powder is a common working powder and has series types of different types of powder types, the ignition point is 290-310 ℃, and the problems of low initial reaction temperature (130 ℃), significant weight loss, sensitivity change and the like under the high-temperature condition of more than 150 ℃ exist; 2/1 Cinnamomum camphora is a commonly used working medicine, its 5 second explosion point is 237 deg.C, and it is verified by high temperature test that it can be quickly decomposed by heat under 160 deg.C-170 deg.C, even completely lost. Because the existing charging sequence of the electric detonator is not resistant to high temperature, and the high-temperature resistant medicament is usually greatly reduced in bridge wire sensitivity, flame sensitivity, burning rate, combustion heat and other properties, the sensitivity, the fire transmission and the work doing characteristics of the high-temperature resistant charging sequence are greatly different from those of the existing charging, and brand new design and verification are needed.
Therefore, to design an electric detonator resistant to a high temperature of more than 200 ℃, a charging sequence design capable of resisting a high temperature of more than 230 ℃ is required, and a high temperature resistant test is carried out for verification.
Disclosure of Invention
In order to solve the problems that the existing electric detonator is lack of a high-temperature resistant charging sequence type of more than 200 ℃ and is difficult to realize a high-temperature resistant action environment, the invention provides a high-temperature resistant insensitive electric detonator and a charging sequence, which realize reliable ignition-ignition functional design, and the charging sequence can also resist 230 ℃ and solve the problem that the charging sequence of the existing electric detonator is not resistant to the high temperature.
Aiming at the requirement of the heat resistance design of the high-temperature resistant insensitive electric detonator, the technical scheme of the invention firstly carries out high-temperature stability test verification of various alternative medicaments, screens out ignition powder and working medicament types suitable for high temperature resistance, and then carries out matching design and test verification of electric ignition sensitivity, flame sensitivity and working capacity of a charging sequence, determines charging conditions such as medicament components, proportion, granularity, density, dosage, adhesive and the like suitable for various properties of the charging sequence, realizes the reliable ignition-fire transfer-working charging sequence structure of the electric detonator, and meets the requirements of the high-temperature resistant environment and high reliability of the electric detonator.
The invention provides a high-temperature resistant insensitive electric detonator and a charging sequence, comprising: screening high-temperature resistant medicaments and designing a charging sequence.
The screening of the high-temperature resistant medicament is to carry out comprehensive analysis through physical stability, chemical stability and explosion stability tests of various medicaments, and screen out alternative medicaments of which all stability analysis items can meet the requirement that the medicament performance change degree is within a permitted range. The method can be implemented by firstly carrying out primary selection according to the fact that the reaction peak temperature of the DSC analysis medicament is higher than the using temperature, and then carrying out comprehensive demonstration according to other thermal analysis methods and explosion performance analysis methods. The stability change and the change degree of the medicament are evaluated through test items such as DSC analysis, TG analysis, constant high-temperature heat loss gravity analysis, appearance analysis, hot wire sensitivity test, output power test and the like of the medicament, the high-temperature stability of the medicament is comprehensively evaluated, and the usable high-temperature resistant medicament is screened.
The design of the charging sequence is based on the comprehensive analysis method for analyzing various stability and optimizing parameter design, and provides a three-layer charging sequence which is resistant to high temperature of 230 ℃ and consists of superfine particle magnesium ignition powder, fine particle magnesium ignition powder and carbon black/potassium nitrate pyrotechnic composition, so that the performance of the three-layer charging sequence meets the requirement of designing the high-temperature resistant insensitive electric detonator charging sequence.
The high temperature resistant charging sequence design of the invention is that the electric detonator is provided with three layers of charging. The first layer of powder charge is ultrafine particle magnesium ignition powder which is coated in the electric ignition tube in a slurry filling mode and is in close contact with the bridge wire, and the design idea of selecting the ultrafine particle magnesium ignition powder is to improve the thermal inductance of the bridge wire; the second layer of charge is a coarser particle magnesium ignition powder which also fills the remaining cavity of the electric ignition tube in a slurry filling manner, and the larger particle size of the second layer of charge is used for having longer output flame duration; after the two layers of slurry-like charging solvents are dried or aired, coating a thin layer of protective paint on the surface of the output magnesium ignition powder charge to play the roles of preventing powder falling and preventing moisture; the third layer is filled with carbon black/potassium nitrate working powder, the granularity and the density of the third layer are selected based on higher flame sensitivity, and the third layer is filled in the reinforcing cap in a press-fitting mode; the electric ignition tube is connected with the shell in a threaded mode, and a fire transmission gap of 1.2 mm is reserved between the electric ignition tube and the reinforcing cap.
When the ignition device needs to act, the ignition device supplies power to the electric igniter, and sequentially ignites the superfine particle magnesium ignition powder, the coarse particle magnesium ignition powder and the carbon black/potassium nitrate working powder to generate high-temperature high-pressure gas to drive the actuating device to complete an actuating task.
The invention provides the following specific technical scheme:
a high-temperature resistant insensitive electric detonator comprises an electric ignition tube, an electric detonator shell and a reinforcing cap which are coaxially connected; the electric ignition tube comprises an electric ignition tube shell, wherein superfine particle magnesium ignition powder and fine particle magnesium ignition powder are filled in the lower end of the electric ignition tube shell from top to bottom, the superfine particle magnesium ignition powder is wrapped on a bridge wire, and the surface of the fine particle magnesium ignition powder is coated with high-temperature resistant protective paint;
the lower end of the electric ignition tube extends into the upper end of the electric explosion tube shell, the reinforcing cap is integrally inserted into the lower end of the electric explosion tube shell, carbon black/potassium nitrate working powder is filled in the reinforcing cap, and the carbon black/potassium nitrate working powder is positioned below the fine-particle magnesium ignition powder;
the shell of the electric ignition tube, the bridge wire, the superfine particle magnesium ignition powder, the fine particle magnesium ignition powder, the high-temperature resistant protective paint, the carbon black/potassium nitrate working powder and the reinforcing cap form a fire transfer sequence.
Preferably, the electric ignition tube is connected with the electric explosion tube shell through threads, and the O-shaped sealing ring is placed in the threaded mounting hole and forms a seal of a combustion chamber pressure-bearing structure together with the electric explosion tube shell.
Preferably, a positioning hole is formed in the electric detonator shell; the reinforcing cap is used for limiting the installation position of the reinforcing cap through the positioning hole of the shell of the electric explosion tube, closing the shell of the electric explosion tube, and coating epoxy glue at the closed position for sealing.
Preferably, the electric igniter tube, the reinforcing cap and the electric detonator shell are assembled in a modularization mode.
Preferably, the center of the output end of the electric igniter tube is aligned with the center of the input end of the reinforcing cap, and a 1.2 mm gap is reserved between the electric igniter tube and the reinforcing cap.
Preferably, the diameter of the bridge wire is 60 μm or more.
Preferably, the electric detonator is provided with three layers of charges; wherein, the first layer of charge is ultrafine particle magnesium ignition charge which is coated in the electric ignition tube in a slurry filling mode and is tightly contacted with the bridge wire; the second layer of powder charge is coarse-grained magnesium ignition powder, and the second layer of powder charge also fills the residual cavity of the electric ignition tube in a pasty filling mode; after the two layers of slurry charging solvents are dried or aired, coating a layer of high-temperature resistant protective paint on the surface of the fine particle magnesium ignition powder; the third layer of powder charge is carbon black/potassium nitrate working powder which is filled in the strengthening cap in a press-fitting mode.
Preferably, the superfine particle magnesium ignition powder has a particle size of 40 microns, the fine particle magnesium ignition powder has a particle size of 100 microns, and the two agents are subjected to high-temperature aging pretreatment at 180 ℃ for 1 day before being filled into the high-temperature resistant insensitive electric squib.
Preferably, the carbon black/potassium nitrate working substance is subjected to a high-temperature aging pretreatment at 180 ℃ for 1 day before being loaded into the reinforcing cap.
Compared with the prior art, the invention has the advantages that:
compared with the existing explosive charging of the initiating explosive device, the high-temperature resistant insensitive electric detonator and the explosive charging sequence designed by the invention have the following advantages:
1) the high-temperature-resistant screening test at 230 ℃ proves that the performance of each medicament can meet the requirement of high-temperature-resistant long-term environment of the high-temperature-resistant shock-sensitive electric explosion tube, and the problem that the conventional medicament charging sequence cannot resist the high temperature of more than 200 ℃ is solved.
2) The center of the output end of the electric ignition tube is aligned with the center of the charge input end of the reinforcing cap, and a 1.2 mm gap is reserved between the center of the output end of the electric ignition tube and the center of the charge input end of the reinforcing cap, so that the assembly manufacturability and the ignition reliability can be improved.
3) The electric ignition tube, the reinforcing cap and the shell are assembled in a modularized mode, and the structure is simple.
Drawings
In order to more clearly illustrate the embodiments of the present application or technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments described in the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings.
FIG. 1 is a structural diagram of a high temperature resistant insensitive electrical squib according to an embodiment of the present invention;
fig. 2 is a structural diagram of an electric squib according to an embodiment of the present invention.
Description of reference numerals:
1. an electric squib; 2. an O-shaped sealing ring; 3. an electric squib housing; 4. positioning holes; 5. a reinforcement cap; 6. carbon black/potassium nitrate as a working agent; 7. epoxy glue; 8. an electric squib housing; 9. a bridging filament; 10. superfine particle magnesium ignition powder; 11. fine particle magnesium ignition powder; 12. high-temperature resistant protective paint.
Detailed Description
In order to make the technical solutions of the present invention better understood, those skilled in the art will now describe the present invention in further detail with reference to the accompanying drawings.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or terminal that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or terminal. Without further limitation, an element defined by the phrases "comprising … …" or "comprising … …" does not exclude the presence of additional elements in a process, method, article, or terminal that comprises the element. Further, herein, "greater than," "less than," "more than," and the like are understood to exclude the present numbers; the terms "above", "below", "within" and the like are to be understood as including the number.
A high temperature resistant insensitive electric detonator, it includes the coaxial electric igniter 1 that links up, electric detonator shell 3, strengthen the cap 5; the electric ignition tube 1 comprises an electric ignition tube shell 8, wherein the inside of the lower end of the electric ignition tube shell 8 is filled with superfine particle magnesium ignition powder 10 and fine particle magnesium ignition powder 11 from top to bottom, the superfine particle magnesium ignition powder 10 wraps a bridgewire 9, and the surface of the fine particle magnesium ignition powder 11 is coated with high-temperature resistant protective paint 12;
the lower end of the electric igniter tube 1 extends into the upper end of the electric igniter tube shell 3, the reinforcing cap 5 is integrally inserted into the lower end of the electric igniter tube shell 3, a carbon black/potassium nitrate working powder 6 is filled in the reinforcing cap 5, and the carbon black/potassium nitrate working powder 6 is positioned below the fine particle magnesium ignition powder 11;
the electric igniter shell 8, the bridge wire 9, the superfine particle magnesium ignition powder 10, the fine particle magnesium ignition powder 11, the high temperature resistant protective paint 12, the carbon black/potassium nitrate working powder 6 and the reinforcing cap 5 form a fire transfer sequence.
Specifically, as shown in fig. 1, the high-temperature resistant insensitive electric squib comprises an electric squib 1, an O-shaped sealing ring 2, an electric squib shell 3, a positioning hole 4, a reinforcing cap 5, a carbon black/potassium nitrate working powder 6, an epoxy glue 7, an electric squib shell 8, a bridge wire 9, an ultrafine particle magnesium ignition powder 10, a fine particle magnesium ignition powder 11 and a high-temperature resistant protective paint 12.
As shown in fig. 2, the electric igniter tube 1 includes an electric igniter tube housing 8, the inside of the lower end of the electric igniter tube housing 8 is filled with an ultrafine magnesium ignition powder 10 and a fine magnesium ignition powder 11 from top to bottom, the ultrafine magnesium ignition powder 10 wraps the bridgewire 9, and the surface of the fine magnesium ignition powder 11 is coated with a high temperature resistant protective paint 12.
The electric igniter tube 1, the electric detonator shell 3 and the reinforcing cap 5 are coaxially connected. Preferably, the electric squib 1, the reinforcement cap 5, the electric squib housing 3 assume a modular assembly. The lower end of the electric ignition tube 1 extends into the upper end of the electric detonator shell 3, preferably, the electric ignition tube 1 is connected with the electric detonator shell 3 through threads, and the O-shaped sealing ring 2 is placed in the threaded mounting hole and forms sealing of a combustion chamber pressure-bearing structure together with the electric detonator shell 3. The reinforcing cap 5 is integrally inserted into the lower end of the squib housing 3. Preferably, a positioning hole 4 is arranged in the electric explosion tube shell 3; the reinforcing cap 5 is limited in installation position through the positioning hole 4 of the electric detonator shell 3, and is used for closing up the electric detonator shell 3, and the closing-up position is coated with epoxy glue 7 for sealing.
The center of the output end of the electric ignition tube 1 is aligned to the center of the input end of the reinforcing cap 5, a 1.2 mm gap is reserved between the electric ignition tube 1 and the reinforcing cap 5, the electric ignition tube has good ignition distance margin, and the assembly manufacturability and the ignition reliability can be improved. The firing distance margin test verification is carried out on the charges of the electric ignition tube 1 and the reinforcing cap 5, and the firing distance between the fine-particle magnesium ignition powder and the carbon black/potassium nitrate working powder obtained by the test can reach more than 100 mm, which shows that the charges of the electric ignition tube 1 and the reinforcing cap 5 have good firing distance margin.
The reinforcing cap 5 is internally filled with a carbon black/potassium nitrate working powder 6, and the carbon black/potassium nitrate working powder 6 is positioned below the fine-particle magnesium ignition powder 11.
The electric igniter shell 8, the bridge wire 9, the superfine particle magnesium ignition powder 10, the fine particle magnesium ignition powder 11, the high temperature resistant protective paint 12, the carbon black/potassium nitrate working powder 6 and the reinforcing cap 5 form a fire transfer sequence.
The superfine particle magnesium ignition powder 10, the fine particle magnesium ignition powder 11 and the carbon black/potassium nitrate working powder 6 all have high temperature resistance, and the electric ignition tube 1 has the characteristic of an insensitive electric igniter.
The diameter of the bridge wire 9 is more than 60 microns, and the bridge wire 9 is combined with the superfine particle magnesium ignition powder 10. By the optimized design of the diameter, the length and the resistance of the bridge wire and the optimized design matched with the bridge wire sensitivity and the heat transfer performance of the magnesium ignition powder, the requirements of reliable ignition of 5 amperes, no ignition of 1 ampere and 1 watt for 5 minutes and safety of resisting electrostatic discharge of 25 kilovolt feet and foot shells can be met.
The charging sequence of the high-temperature resistant insensitive electric detonator is as follows: the electric detonator is provided with three layers of explosive charges; wherein, the first layer of powder charge is superfine particle magnesium ignition powder 10 which is coated in the electric ignition tube 1 in a slurry filling mode and is tightly contacted with the bridgewire 9, the superfine particle magnesium ignition powder 10 is used as the ignition powder of the bridgewire 9, and the design idea of selecting the superfine particle magnesium ignition powder is to improve the heat sensitivity of the bridgewire; the second layer of powder charge is coarse-grained fine-grained magnesium ignition powder 11 which also fills the residual cavity of the electric ignition tube in a pasty filling mode, the grain size of the electric ignition tube is larger so as to have longer output flame duration, and the fine-grained magnesium ignition powder 11 is used as output ignition powder; after the two layers of slurry charging solvents are dried or aired, coating a layer of high-temperature resistant protective paint 12 on the surface of the fine-particle magnesium igniter 11, wherein the high-temperature resistant protective paint 12 plays a role in preventing medicine blocks from falling and preventing moisture; the magnesium ignition powder has the characteristics of high temperature resistance, good bridge wire sensitivity and flame sensitivity, high instantaneous degree, high combustion heat value and long flame duration, is suitable for serving as bridge wire ignition powder and high-energy output ignition powder, and the temperature resistance tests of the two magnesium ignition powders show that the magnesium ignition powder can resist a high-temperature environment of 230 ℃; the third layer is filled with carbon black/potassium nitrate working powder 6, the granularity and the density of which are selected according to the higher flame sensitivity and are filled in the reinforcing cap 5 in a press-fitting mode.
The particle size of the superfine particle magnesium ignition powder 10 is 40 microns, and the particle size of the fine particle magnesium ignition powder 11 is 100 microns. In order to improve the high-temperature stability, the two medicaments are subjected to high-temperature aging pretreatment at 180 ℃ for 1 day before being filled into a high-temperature resistant insensitive electric explosion tube, so that the pre-reaction of the medicaments in a high-temperature long-term environment is reduced.
In order to improve the high temperature stability, the carbon black/potassium nitrate working agent is subjected to high temperature aging pretreatment at 180 ℃ for 1 day before being filled into the reinforcing cap 5, so as to reduce the pre-reaction of the agent in a long-term high temperature environment. The temperature resistance test of the carbon black/potassium nitrate working substance 6 shows that the carbon black/potassium nitrate working substance can resist the high-temperature environment of 230 ℃.
The temperature resistance characteristics of the superfine particle magnesium ignition powder 10 and the fine particle magnesium ignition powder 11 of the electric ignition tube 1 in the high-temperature resistant insensitive electric explosion tube are verified by high-temperature tests, wherein a DSC curve after high-temperature treatment at 230 ℃ for 4 hours has a reaction peak in the range from normal temperature to 550 ℃, the initial temperature of the reaction is 440 ℃ (still higher than 230 ℃) and the reaction peak temperature is 442 ℃. The ignition powder has better temperature resistance than the existing ignition powder, and the temperature resistance parameters show that the two magnesium ignition powders can resist the high-temperature environment of 230 ℃.
The carbon black/potassium nitrate working powder 6 is loaded on the reinforcing cap 5 of the high-temperature resistant insensitive electric explosion tube, and in order to improve the high-temperature stability, the carbon black/potassium nitrate working powder 6 is subjected to high-temperature aging pretreatment at 180 ℃ for 1 day before being loaded into the reinforcing cap 5 so as to reduce the pre-reaction of the agent in a long-term high-temperature environment, and the carbon black/potassium nitrate working powder 6 is filled in the reinforcing cap 5 in a press-fitting mode. The two ends of the reinforcing cap 5 are encapsulated by silk cushions to ensure the charging structural strength and higher flame sensitivity at the fire transfer hole, and the carbon black/potassium nitrate working agent has the characteristics of high temperature resistance, good flame sensitivity, large gas production, high peak pressure, short maximum pressure rise time and small energy loss in the working process, and is suitable for being used as the working charge of the separation actuating device.
The high-temperature test verifies that the temperature resistance of the carbon black/potassium nitrate working substance 6 is that the DSC curve is in the range from normal temperature to 550 ℃, and the initial reaction peak temperature of the interaction of the potassium nitrate and the carbon black is 442 ℃ (212 ℃ higher than 230 ℃); the weight loss change of the high temperature sample after 4 hours at 230 ℃ was 0.6%, and the p-t peak pressure change was changed from 6.88 MPa to 6.2 MPa. The temperature resistance tests show that the carbon black/potassium nitrate working agent 6 can resist the high-temperature environment of 230 ℃.
The charging sequence consisting of the superfine particle magnesium ignition powder 10, the fine particle magnesium ignition powder 11 and the carbon black/potassium nitrate working powder 6 is suitable for the high-temperature resistant environment for the spacecraft, can resist the high-temperature environment of 230 ℃, and can meet the requirements of the high-temperature resistant fire actuating device for the spacecraft.
The screening method of the high-temperature resistant medicament used in the above embodiment is to pass the DSC test, the high-temperature 230 ℃ test, the thermal weightlessness test, the appearance observation, the bridge wire sensitivity test, and the power-applying force test of the medicament on the ultrafine magnesium ignition powder 10, the fine magnesium ignition powder 11, and the carbon black/potassium nitrate power-applying powder 6, so as to comprehensively evaluate the high-temperature stability of the medicament to be good, and the performance of the medicament can meet the requirements of the charging sequence of the high-temperature resistant firer actuating device for the spacecraft.
Compared with the existing explosive loading of the initiating explosive device, the high-temperature resistant insensitive electric detonator and the explosive loading sequence have the following advantages:
1) the high-temperature 230 ℃ temperature-resistant screening test verifies that the performance of each medicament can meet the requirement of high-temperature-resistant long-term environment of the high-temperature-resistant shock-sensitive electric detonator, and the problem that the conventional medicament-charging sequence cannot resist the high temperature of more than 200 ℃ is solved.
2) The center of the output end of the electric ignition tube is aligned with the center of the charge input end of the reinforcing cap, and a 1.2 mm gap is reserved between the center of the output end of the electric ignition tube and the center of the charge input end of the reinforcing cap, so that the assembly manufacturability and the ignition reliability can be improved.
3) The electric ignition tube, the reinforcing cap and the shell are assembled in a modularized mode, and the structure is simple.
While certain exemplary embodiments of the present invention have been described above by way of illustration only, it will be apparent to those of ordinary skill in the art that the described embodiments may be modified in various different ways without departing from the spirit and scope of the invention. Accordingly, the drawings and description are illustrative in nature and should not be construed as limiting the scope of the invention.
Claims (9)
1. A high-temperature resistant insensitive electric detonator is characterized by comprising an electric igniter tube, an electric detonator shell and a reinforcing cap which are coaxially connected; the electric ignition tube comprises an electric ignition tube shell, wherein the inside of the lower end of the electric ignition tube shell is filled with superfine particle magnesium ignition powder and fine particle magnesium ignition powder from top to bottom, the superfine particle magnesium ignition powder wraps the bridge wire, and the surface of the fine particle magnesium ignition powder is coated with high-temperature resistant protective paint; the particle size of the superfine particle magnesium ignition powder is 40 microns, and the particle size of the fine particle magnesium ignition powder is 100 microns; the lower end of the electric ignition tube extends into the upper end of the electric explosion tube shell, the reinforcing cap is integrally inserted into the lower end of the electric explosion tube shell, and carbon black/potassium nitrate working powder is filled in the reinforcing cap and is positioned below the fine-particle magnesium ignition powder;
the shell of the electric ignition tube, the bridge wire, the superfine particle magnesium ignition powder, the fine particle magnesium ignition powder, the high-temperature resistant protective paint, the carbon black/potassium nitrate working powder and the reinforcing cap form a fire transfer sequence.
2. The high temperature resistant blunt force electrical squib of claim 1, wherein said electrical squib is threadably connected to the electrical squib housing, and wherein the O-ring seal is disposed within the threaded mounting hole and forms a seal with the electrical squib housing for a combustion chamber pressure-bearing structure.
3. A high temperature tolerant insensitive electric squib according to claim 1, wherein a locating hole is provided in the electric squib housing; the reinforcing cap is used for limiting the installation position of the reinforcing cap through the positioning hole of the shell of the electric explosion tube, closing the shell of the electric explosion tube, and coating epoxy glue at the closed position for sealing.
4. The high temperature tolerant non-induction squib of claim 1, wherein the electrical squib, reinforcement cap, and squib housing are in a modular assembly.
5. The high temperature tolerant non-induction squib of claim 1, wherein the center of the output end of the electrical squib is aligned with the center of the input end of the reinforcement cap, leaving a 1.2 mm gap between the electrical squib and the reinforcement cap.
6. A high temperature tolerant insensitive electrical squib as claimed in claim 1, wherein the diameter of the bridging wire is 60 microns or more.
7. A charging sequence for a high temperature resistant insensitive electric detonator as claimed in any of the claims 1 to 6 wherein the electric detonator has a triple charge; wherein, the first layer of charge is superfine particle magnesium ignition powder which is coated in the electric ignition tube in a slurry filling mode and is tightly contacted with the bridge wire; the second layer of powder charge is coarse-grained magnesium ignition powder, and the second layer of powder charge also fills the residual cavity of the electric ignition tube in a pasty filling mode; after the two layers of slurry charging solvents are dried or aired, coating a layer of high-temperature resistant protective paint on the surface of the fine particle magnesium ignition powder; the third layer of charge is carbon black/potassium nitrate working powder which is filled in the reinforcing cap in a press-fitting mode.
8. The charging sequence of the high temperature resistant insensitive electric squib as recited in claim 7, wherein the ultrafine grain magnesium ignition powder and the fine grain magnesium ignition powder are subjected to a high temperature aging pretreatment of 180 ℃ for 1 day before being charged into the high temperature resistant insensitive electric squib.
9. The charging sequence of a high temperature insensitive electrical detonator as claimed in claim 7 wherein the carbon black/potassium nitrate primer is subjected to a high temperature aging pretreatment at 180 ℃ for 1 day prior to being installed in the reinforcing cap.
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| US5845578A (en) * | 1997-02-10 | 1998-12-08 | Trw Inc. | Ignition element |
| CN101975534B (en) * | 2010-05-17 | 2015-04-01 | 中国兵器工业第二一三研究所 | Insensitive electric igniter for nuclear blast valve |
| EP2594545B1 (en) * | 2010-07-15 | 2015-09-09 | Nipponkayaku Kabushikikaisha | Igniting powder composition for igniters |
| CN103968722B (en) * | 2014-05-21 | 2015-10-28 | 中国工程物理研究院化工材料研究所 | A kind of explosive valve igniter |
| CN106699490A (en) * | 2016-01-25 | 2017-05-24 | 湖北航天化学技术研究所 | Safety airbag igniting powder composition and preparation method of safety airbag igniting powder composition |
| CN107270312B (en) * | 2017-05-26 | 2019-04-19 | 北京航天发射技术研究所 | A kind of Metal Substrate ignition power device |
| CN109186380A (en) * | 2018-08-17 | 2019-01-11 | 南京理工大学 | A kind of no explosive wastewater electric ignition device |
| CN209197586U (en) * | 2018-11-09 | 2019-08-02 | 北方特种能源集团有限公司西安庆华公司 | A kind of high temperature resistant, high pressure resistant igniter |
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