Linear air bag double-layer explosion attenuation tube control structure

Abstract

A linear air bag double-layer explosion attenuation tube control structure relates to the field of initiating explosive device separation and comprises an air bag, an outer attenuation tube, an inner attenuation tube and a flexible detonating cord, the outer attenuation tube is sleeved outside the inner attenuation tube, the flexible detonating cord is located inside the inner attenuation tube, and the air bag is sleeved outside the outer attenuation tube; a ventilation outer hole is formed in the outer attenuation tube, a ventilation inner hole is formed in the inner attenuation tube, and the ventilation outer hole and the ventilation inner hole are staggered; the diameter of the ventilation outer holes is 10%-90% of the inner diameter of the outer attenuation pipe, the diameter of the ventilation inner holes is 10%-90% of the inner diameter of the inner attenuation pipe, the distance between the ventilation outer holes is 2-4 times of the inner diameter of the outer attenuation pipe, and the distance between the ventilation inner holes is 2-4 times of the inner diameter of the inner attenuation pipe. The problems that the explosion impact index is out of tolerance, the separation reliability is reduced and the like due to the fact that the detonation power generated after the explosive amount is adjusted cannot be accurately controlled are solved.

Description

Technical Field

[0001] The invention belongs to the field of pyrotechnic separation, and relates to a linear airbag double-layer explosion attenuation tube control structure, which is particularly suitable for low-impact and pollution-free separation of linear airbags. Background Art

[0002] With the development of domestic weapon technology, the requirements for weapon accuracy are getting higher and higher, and thus weapon control equipment is becoming more and more sophisticated. Traditional separation pyrotechnics have a large explosion impact due to the direct action of explosives, and produce a large amount of polluted smoke and dust, which has an adverse effect on the internal control equipment of the weapon. The airbag separation device has the advantages of low impact, no pollution, high working reliability, short working time, small size, light weight, and convenient service handling. It is especially suitable for drone separation or cluster bomb separation. After the airbag separation device works, the load separation speed, explosion impact and other indicators can be appropriately adjusted by changing the amount of explosive rope, but in engineering applications, only adjusting the amount may lead to risks such as insufficient separation reliability and out-of-tolerance indicators, which will have a significant impact on the success or failure of the drone system and weapon system.

[0003] Chinese patent CN205076059U is named as a pollution-free airbag separation device airbag end sealing device, which is composed of an airbag, a head, an inner clamp, an outer clamp, a cover and a joint. The sealing device can effectively prevent air leakage and airbag damage at the end during separation, and has good environmental adaptability. The above device is not suitable for effectively protecting the explosion attenuation tube from detonation products while ensuring the structural control of the inflation rate.

[0004] Chinese patent CN204776079U is named as a rivet protection device for a pollution-free airbag separation device, which is composed of explosive rope, inner tube, outer tube, airbag, rivet, U-shaped joint, grooved joint, upper shell, lower shell, rubber plate, pressure plate, etc. The overall structure is relatively complex, which can effectively prevent the rivet head from flying out during separation, reduce the risk of damaging the payload, and improve the safety of longitudinal separation of the space vehicle. The above device is not applicable to the structural control of the explosion attenuation tube to effectively protect the detonation products while ensuring the inflation rate. Summary of the invention

[0005] The technical problem solved by the present application is: to overcome the deficiencies of the prior art and to provide a linear airbag double-layer explosion attenuation tube control structure, which effectively solves the problems that the detonation power generated after the amount of explosives is adjusted cannot be accurately controlled, resulting in excessive explosion impact indicators and reduced separation reliability.

[0006] The technical solutions provided by this application are as follows:

[0007] A linear airbag double-layer explosion attenuation tube control structure, comprising an airbag, an outer attenuation tube, an inner attenuation tube and a flexible detonating cord, wherein the outer attenuation tube is sleeved outside the inner attenuation tube, the flexible detonating cord is located inside the inner attenuation tube, and the airbag is sleeved outside the outer attenuation tube; an outer ventilation hole is provided on the outer attenuation tube, an inner ventilation hole is provided on the inner attenuation tube, and the outer ventilation hole and the inner ventilation hole are staggered;

[0008] The diameter of the outer ventilation hole is 10% to 90% of the inner diameter of the outer attenuation tube, the diameter of the inner ventilation hole is 10% to 90% of the inner diameter of the inner attenuation tube, the distance between two adjacent outer ventilation holes is 1 to 3 times the inner diameter of the outer attenuation tube, and the distance between two adjacent inner ventilation holes is 2 to 4 times the inner diameter of the inner attenuation tube.

[0009] The outer attenuation tube is made of stainless steel with a thickness of no more than 2 mm, and the inner attenuation tube is made of stainless steel with a thickness of no more than 2 mm.

[0010] The airbag is a multi-layer non-metal structure, the inner layer of the airbag is rubber or polyurethane, and the outer layer of the airbag is a woven layer.

[0011] The diameter of the outer ventilation hole is 15% to 60% of the inner diameter of the outer attenuation tube, and the diameter of the inner ventilation hole is 20% to 70% of the inner diameter of the inner attenuation tube.

[0012] The total area of ​​the outer ventilation holes is smaller than the total area of ​​the inner ventilation holes.

[0013] The total area of ​​the outer ventilation holes is 50% to 80% of the total area of ​​the inner ventilation holes.

[0014] The outer ventilation holes and the inner ventilation holes are each arranged in at least one row, each row of the outer ventilation holes is distributed along the axis direction of the outer attenuation tube, and each row of the inner ventilation holes is distributed along the axis direction of the inner attenuation tube.

[0015] The ventilation inner holes are arranged in three rows, and the three rows of ventilation inner holes are evenly distributed at 120 degrees. The ventilation outer holes are arranged in one row, and the ventilation outer holes are directly opposite to the middle of two adjacent rows of ventilation inner holes.

[0016] In summary, this application at least includes the following beneficial technical effects:

[0017] (1) The linear airbag double-layer explosion attenuation tube control structure of the present invention realizes the reliable separation control of loads of different weights under a constant charge amount by changing the charge amount to generate different separation forces, rather than the usual method of achieving separation of different loads by changing the charge amount. This avoids the problems of exceeding the tolerance of explosion impact index and decreasing separation reliability due to the increase or decrease of the charge amount, and is one of the development directions of linear separation in the military industry.

[0018] (2) The present invention adopts a double-layer explosion attenuation tube to gradually attenuate the explosion impact generated by the strong explosion of the flexible detonating cord. Secondly, the staggered design of the air outlet of the double-layer explosion attenuation tube effectively isolates the solid detonation products while ensuring smooth air outlet.

[0019] (3) The parameters such as the aperture, hole spacing, and number of hole rows of the vent holes on the explosion attenuation device of the present invention are changed and adjusted according to actual use requirements to achieve control of the gas outlet rate (the inflation rate in the airbag), thereby achieving reliable scattering and separation control of different weight loads under the condition of constant amount of explosives. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a simplified structural diagram of the present invention;

[0021] Figure 2 It is a schematic diagram of the cross section of the structure of the present invention;

[0022] Figure 3 This is a schematic diagram of the aperture of the double-layer explosion attenuation tube of the present invention;

[0023] Figure 4 This is a schematic diagram of the spacing between double-layer explosion attenuation tube holes of the present invention;

[0024] Figure 5 This is a schematic diagram of the number of double-layer explosion attenuation tube holes of the present invention;

[0025] Figure 6 Schematic diagram of the preferred distribution of outer ventilation holes and inner ventilation holes.

[0026] Explanation of the accompanying drawings: 1. Air bag; 2. External attenuation tube; 21. External ventilation hole; 3. Internal attenuation tube; 31. Internal ventilation hole; 4. Flexible detonating cord. DETAILED DESCRIPTION

[0027] The word "exemplary" is used exclusively herein to mean "serving as an example, embodiment, or illustration." Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments. Although various aspects of the embodiments are shown in the drawings, the drawings are not necessarily drawn to scale unless otherwise noted.

[0028] The present application embodiment discloses a linear airbag double-layer explosion attenuation tube control structure.

[0029] like Figure 1 , Figure 2As shown, it includes an airbag 1, an outer attenuation tube 2, an inner attenuation tube 3, and a flexible detonating cord 4; the outer attenuation tube 2 is sleeved outside the inner attenuation tube 3, the flexible detonating cord 4 is located inside the inner attenuation tube 3, the airbag 1 is sleeved outside the outer attenuation tube 2, the outer attenuation tube 2 is provided with an outer ventilation hole 21, the inner attenuation tube 3 is provided with an inner ventilation hole 31, and the outer ventilation hole 21 and the inner ventilation hole 31 are staggered. After the flexible detonating cord 4 is axially detonated, the explosive in the flexible detonating cord 4 explodes to form explosion products, most of the explosion solid products are effectively isolated by the inner attenuation tube 3, and the remaining part of the explosion solid products are completely isolated by the outer attenuation tube 2, and cannot directly contact with the outermost airbag 1, so as to prevent the airbag 1 from being punctured and ruptured and leaking. The explosion gas products enter the airbag 1 through the vents on the inner attenuation tube 3 and the outer attenuation tube 2, causing the airbag 1 to deform and expand rapidly, generating thrust to push the load out, thereby achieving a predetermined separation function. The appropriate amount of flexible detonating cord 4 (0.8g / m2 to 4g / m2) can be selected according to loads of different weights.

[0030] According to the load scattering and separation process of the airbag separation device, after the airbag 1 is inflated, the internal pressure of the airbag 1 increases, causing the airbag 1 to expand to the maximum displacement, thereby generating thrust to scatter and separate the load. Therefore, the most critical part of the entire separation process is the expansion process of the airbag, which mainly involves the flexible detonating cord 4, the inner attenuation tube 3, the outer attenuation tube 2 and the airbag 1.

[0031] The functions of the inner attenuation tube 3 and the outer attenuation tube 2 are mainly reflected in three aspects. First, they are used to ensure the gas outlet rate of the gas outlet holes on the attenuation tube. The gas outlet rate directly affects the time for the airbag 1 to quickly expand to the maximum displacement, thereby affecting the final thrust. Second, while ensuring the gas outlet rate, they completely block the detonation residue from directly acting on the airbag 1, causing the airbag 1 to be perforated and leaked. Third, they attenuate the detonation wave generated by the explosion of the flexible detonating cord 4 to a certain extent to prevent the detonation wave from directly breaking the airbag 1 and causing leakage.

[0032] Therefore, when the charge of the flexible detonating cord 4 is constant, the structure of the double-layer explosion attenuation tube inside the airbag 1 directly affects the inflation process of the airbag 1 and the effective blocking of the explosion products, thereby affecting the separation performance of the airbag separation device.

[0033] There is a negative correlation between the effective blocking effect of the attenuation tube on the explosion products and the gas outlet rate. By adjusting the variables such as the aperture, hole spacing, and the number of circumferential hole columns of the outer attenuation tube 2 and the inner attenuation tube 3, while effectively protecting the explosion products, the pressure inside the airbag 1 and the maximum displacement reached by the deformation of the airbag 1 are changed accordingly, resulting in a corresponding change in the thrust generated by the airbag 1.

[0034] The airbag 1 is a multi-layer non-metallic structure, with an inner layer of rubber or polyurethane and an outer layer of a woven layer. The airbag 1 has the advantages of flexibility, thin wall, high strength, etc. It can be folded into any shape according to the use requirements. The thickness is generally not more than 1mm, and the breaking pressure is not less than 1.6MPa. The airbag 1 cannot directly contact the solid product produced by the explosion of the flexible detonating cord 4, otherwise it will be perforated and ruptured, resulting in the airbag 1 being unable to expand normally.

[0035] like Figure 3 , Figure 4 , Figure 5 As shown, the material of the outer attenuation tube 2 and the inner attenuation tube 3 is stainless steel with a thickness of 1mm to 2mm; the outer attenuation tube 2 and the inner attenuation tube 3 are both provided with evenly distributed ventilation holes along the length direction, and the inner ventilation holes are relatively staggered with the outer ventilation holes. The number of ventilation hole rows N1 of the outer attenuation tube 2 and the number of ventilation hole rows N2 of the inner attenuation tube 3 include single row, double row and triple row. The single row of holes is set at the 0° position, the double row of holes is set at the evenly distributed 180° position, and the triple row of holes is set at the evenly distributed 120° position; different numbers of hole rows affect the pressure in the airbag 1 and the thrust generated. The specific number of hole rows can be designed according to actual needs. It is recommended that the number of hole rows N2 of the inner attenuation tube 3 is three rows of holes, and the number of hole rows N1 of the outer attenuation tube 2 is a single row of holes. The specific distribution diagram of the inner attenuation 3 and the outer attenuation 2 is shown as follows. Figure 6 shown.

[0036] The diameter of the outer ventilation hole is 10% to 90% of the inner diameter of the outer attenuation tube, the diameter of the inner ventilation hole is 10% to 90% of the inner diameter of the inner attenuation tube, the spacing between the outer ventilation holes is 2 to 4 times the inner diameter of the outer attenuation tube, and the spacing between the inner ventilation holes is 2 to 4 times the inner diameter of the inner attenuation tube. It can be adjusted according to actual use requirements to achieve separate scattering control of different loads under a constant dose.

[0037] The specific aperture can be designed according to actual needs. When the inner diameter of the inner attenuation tube 3 is 4mm and the outer diameter is 6mm, the recommended preferred ventilation hole diameter of the inner attenuation tube 3 is 2.5mm, and the recommended preferred ventilation hole spacing of the inner attenuation tube 3 is 15mm; when the inner diameter of the outer attenuation tube 2 is 10mm and the outer diameter is 12mm, the recommended preferred ventilation hole diameter of the outer attenuation tube 2 is 2.5mm, and the recommended preferred ventilation hole spacing of the outer attenuation tube 2 is 15mm.

[0038] The flexible detonating cord 4 has a certain flexibility, and is coated with non-metallic materials for protection. The inside of the detonating cord is a detonating cord composed of a metal shell and explosives. The metal shell of the detonating cord is lead, and the explosives inside can be hexanitroquinone, hexanitrostilbene, octoquinone, etc. The line density can be selected from 0.8g / m to 4g / m according to demand. The flexible detonating cord 4 is the power source of the separation device of the airbag 1, and a large amount of gas products and solid products are generated through the operation of the explosives.

[0039] The inner attenuation tube 3 is mainly used to block the explosion impact under the strong explosion of the flexible detonating cord 4, isolate most of the explosion solid products produced after the explosion of the flexible detonating cord 4, and introduce the explosion gas of the flexible detonating cord 4 into the outer attenuation tube 2. The material of the inner attenuation tube 3 is stainless steel, and the thickness is generally not more than 2mm. If the attenuation tube is too thick, it will absorb too much heat generated by the explosion, and finally reduce the gas outlet rate and affect the thrust generated by the airbag. It can be adjusted according to actual use requirements. There is a certain gap between the inner attenuation tube 3 and the outer attenuation tube 2, and the gap is not less than 1mm. The ventilation holes of the inner attenuation tube 3 are relatively staggered with the ventilation holes of the outer attenuation tube 2.

[0040] The outer attenuation tube 2 is mainly used to block the explosion impact under the strong explosion of the flexible detonating cord 4, isolate the remaining explosion solid products not blocked by the inner attenuation tube 3, and introduce the explosion gas of the flexible detonating cord 4 into the airbag 1. The outer attenuation tube 2 is made of stainless steel, and the thickness is generally not more than 2mm. If the attenuation tube is too thick, it will absorb too much heat generated by the explosion, and finally reduce the gas outlet rate, affecting the thrust generated by the airbag. It can be adjusted according to actual use requirements.

[0041] The thickness of the outer attenuation tube 2 and the inner attenuation tube 3 is related to the amount of medicine and the gas outlet. The thicker the outer attenuation tube 2 and the inner attenuation tube 3 are, the more heat is absorbed, which affects the gas outlet speed. Therefore, the thickness of the outer attenuation tube 2 and the inner attenuation tube 3 of the present application is the minimum thickness that meets the strength requirements.

[0042] The present application achieves the goal of shielding solid objects produced by the explosion while ensuring the gas output volume and speed by setting the size and position of the vent holes, so that the airbag 1 is inflated at a faster speed and with greater thrust.

[0043] There is a positive correlation between the effective blocking of the explosion products by the attenuation tube and the explosion impact received by the load. By adjusting the variables such as the aperture, hole spacing, and the number of circumferential holes of the outer attenuation tube 2 and the inner attenuation tube 3, while effectively protecting the explosion products and ensuring the gas outlet rate of the attenuation tube outlet, the explosion impact value of the scattered load when the explosive cord explodes is effectively reduced, and the impact on the scattered load is reduced to avoid damage to the precision instruments in the load.

[0044] Example 1

[0045] When the inner diameter of the inner attenuation tube 3 is 4mm and the outer diameter is 6mm, the diameter of the inner ventilation hole is 2.5mm, and the spacing between the inner ventilation holes is 15mm; when the inner diameter of the outer attenuation tube 2 is 10mm and the outer diameter is 12mm, the diameter of the outer ventilation hole is 2.5mm, and the spacing between the outer ventilation holes is 15mm. The inner ventilation holes are arranged in three rows, and the three rows of inner ventilation holes are evenly distributed at 120°. The outer ventilation holes are arranged in one row, and the outer ventilation holes are directly opposite to the middle of the two adjacent rows of inner ventilation holes.

[0046] The amount of flexible detonating cord 4 is: 1.4g / m, and the maximum volume of the airbag in its natural state is 163280mm 3 , the length of the inner attenuation tube 3 and the outer attenuation tube 2 is 130 mm.

[0047] 0.23ms after the flexible detonating cord 4 was detonated, the airbag was expanded to its maximum volume, the maximum displacement of the airbag was 11mm, and the airbag expansion speed was 47.8m / s.

[0048] Example 2

[0049] The inner diameter of the inner attenuation tube 3 is 4mm, the outer diameter is 6mm, the second ventilation inner hole diameter is 1.0mm, and the second ventilation inner hole spacing is 20mm; the inner diameter of the outer attenuation tube 2 is 10mm, the outer diameter is 12mm, the first ventilation outer hole diameter is 1.5mm, and the ventilation outer hole spacing is 20m. The ventilation inner holes are arranged in three rows, and the three rows of ventilation inner holes are evenly distributed at 120°. The ventilation outer holes are arranged in one row, and the ventilation outer holes are directly opposite to the middle of the two adjacent rows of ventilation inner holes.

[0050] The amount of flexible detonating cord 4 is: 1.4g / m, and the maximum volume of the airbag in its natural state is: 163280mm 3 The length of the inner attenuation tube 3 and the outer attenuation tube 2 is: 130mm.

[0051] 0.25ms after the flexible detonating cord 4 was detonated, the airbag was expanded to its maximum volume, the maximum displacement of the airbag was 10.1mm, and the speed of the airbag expansion was 40.4m / s.

[0052] The present application is described in detail above in conjunction with specific implementation methods and exemplary examples, but these descriptions cannot be understood as limiting the present application. Those skilled in the art understand that, without departing from the spirit and scope of the present application, a variety of equivalent replacements, modifications or improvements can be made to the technical solution of the present application and its implementation methods, all of which fall within the scope of the present application. The scope of protection of the present application shall be subject to the attached claims.

[0053] The contents not described in detail in this application specification belong to the common knowledge of those skilled in the art.

Claims

1. A linear airbag double-layer explosion attenuation tube control structure, characterized in that: The invention comprises an air bag (1), an outer attenuation tube (2), an inner attenuation tube (3) and a flexible detonating cord (4); the outer attenuation tube (2) is sleeved outside the inner attenuation tube (3), the flexible detonating cord (4) is located inside the inner attenuation tube (3), and the air bag (1) is sleeved outside the outer attenuation tube (2); an outer ventilation hole (21) is provided on the outer attenuation tube (2), and an inner ventilation hole (31) is provided on the inner attenuation tube (3); the outer ventilation hole (21) and the inner ventilation hole (31) are staggered; The diameter of the ventilation outer hole (21) is 10% to 90% of the inner diameter of the outer attenuation tube (2), the diameter of the ventilation inner hole (31) is 10% to 90% of the inner diameter of the inner attenuation tube (3), the distance between two adjacent ventilation outer holes (21) is 1 to 3 times the inner diameter of the outer attenuation tube (2), and the distance between two adjacent ventilation inner holes (31) is 2 to 4 times the inner diameter of the inner attenuation tube (3).

2. A linear airbag double-layer explosion attenuation tube control structure according to claim 1, characterized in that: The outer attenuation tube (2) is made of stainless steel with a thickness of no more than 2 mm, and the inner attenuation tube (3) is made of stainless steel with a thickness of no more than 2 mm.

3. A linear airbag double-layer explosion attenuation tube control structure according to claim 1, characterized in that: The airbag (1) is a multi-layer non-metallic structure, the inner layer of the airbag (1) is rubber or polyurethane, and the outer layer of the airbag (1) is a woven layer.

4. A linear airbag double-layer explosion attenuation tube control structure according to claim 1, characterized in that: The diameter of the outer ventilation hole (21) is 15% to 60% of the inner diameter of the outer attenuation tube (2), and the diameter of the inner ventilation hole (31) is 20% to 70% of the inner diameter of the inner attenuation tube (3).

5. A linear airbag double-layer explosion attenuation tube control structure according to claim 1, characterized in that: The total area of ​​the outer ventilation holes (21) is smaller than the total area of ​​the inner ventilation holes (31).

6. A linear airbag double-layer explosion attenuation tube control structure according to claim 6, characterized in that: The total area of ​​the outer ventilation holes (21) is 50% to 80% of the total area of ​​the inner ventilation holes (31).

7. A linear airbag double-layer explosion attenuation tube control structure according to claim 1, characterized in that: The ventilation outer holes (21) and the ventilation inner holes (31) are each arranged in at least one row, each row of ventilation outer holes (21) is distributed along the axial direction of the outer attenuation tube (2), and each row of ventilation inner holes (31) is distributed along the axial direction of the inner attenuation tube (3).

8. A linear airbag double-layer explosion attenuation tube control structure according to claim 7, characterized in that: The ventilation inner holes (31) are arranged in three rows, and the three rows of ventilation inner holes (31) are evenly distributed at 120 degrees. The ventilation outer holes (21) are arranged in one row, and the ventilation outer holes (21) are directly opposite to the middle of two adjacent rows of ventilation inner holes (31).

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