A reliable transmission structure for free loading of a pyrotechnic charge

Abstract

The present application relates to a kind of reliable transmission fire structure of implementation free filling pyrotechnics charge, belong to pyrotechnics technical field.The reliable transmission fire structure of the present application includes: transmission fire pipe (1) and main charge solid medicine structure;The transmission fire pipe (1) adopts overall content cavity annular transmission fire hole mode, transmission fire hole is evenly distributed and and axial certain angle forms umbrella-shaped spray structure, easy to ignite main charge;The solid medicine structure includes: upper medicine blocking plate (2) and lower medicine blocking plate (3), upper medicine blocking plate (2) is designed as inside and outside openwork structure, lower medicine blocking plate (3) is designed as stepped structure.The present application improves the effect that the flame and incandescent particle produced after the combustion of transmission fire medicine act on main charge surface, makes main charge action more reliable.

Description

Technical Field

[0001] This invention belongs to the field of pyrotechnics technology and relates to a reliable ignition transmission structure for realizing free loading of pyrotechnic charges. Background Technology

[0002] Explosives are mostly pyrotechnic agents, typically packaged loosely or directly compressed into the casing. To meet product requirements, an increasing number of pyrotechnics are now using shaped charges as the main charge, loaded freely into the combustion chamber. Ignition of these shaped charges usually relies on the central propellant tube, which only ignites the central hole of the main charge, resulting in poor ignition of the outer walls. Furthermore, the solid, perforated upper and lower baffles hinder ignition of the main charge and the flow of combustible gases after ignition. To address these issues, innovative designs for the ignition transmission structure are needed to achieve reliable ignition transmission for freely loaded pyrotechnic charges. Summary of the Invention

[0003] (a) Technical problems to be solved

[0004] The technical problem to be solved by the present invention is how to provide a reliable ignition structure for free-filling pyrotechnic charges, so as to solve the problem that the existing ignition structure for free-filling pyrotechnic charges does not utilize the reliable ignition of the main charge and the smooth flow of gas.

[0005] (II) Technical Solution

[0006] In order to solve the above technical problems, the present invention provides a reliable ignition structure for realizing free loading of pyrotechnic charges. The reliable ignition structure includes: a ignition tube (1) and a main charge fixing structure.

[0007] The ignition tube (1) adopts an integral internal cavity with circumferential ignition holes. The ignition holes are evenly distributed and form an umbrella-shaped spray structure at a certain angle to the axial direction, which facilitates the ignition of the main charge.

[0008] The drug-fixing structure includes an upper drug-blocking plate (2) and a lower drug-blocking plate (3). The upper drug-blocking plate (2) is designed as an inner and outer hollow structure, and the lower drug-blocking plate (3) is designed as a stepped structure.

[0009] Furthermore, the reliable ignition structure also includes: a shell, which has a first inner cavity and a second inner cavity from top to bottom, and the first inner cavity has an internal thread; an ignition tube (1) is installed in the first inner cavity by a threaded connection for installing ignition propellant; an upper baffle plate (2) and a lower baffle plate (3) are installed in the second inner cavity, and the main charge is installed between the upper baffle plate (2) and the lower baffle plate (3).

[0010] Furthermore, the ignition tube (1) has an inverted "mountain" shaped structure with a groove around the lower protrusion. The ignition tube (1) has an external thread on the outside and a third inner cavity (1b) and a fourth inner cavity arranged from bottom to top inside. The third inner cavity (1b) is used to install the ignition propellant, and the fourth inner cavity is used to install the igniter. Several ignition holes (1a) are evenly distributed in the circumference between the third inner cavity (1b) and the groove. The ignition tube (1) adopts an integral inner cavity with circumferential ignition holes. The ignition holes are evenly distributed and form an umbrella-shaped spray structure at a certain angle to the axial direction.

[0011] Furthermore, the fire transmission holes (1a) are 4 to 10 evenly distributed holes, with a size of φ1.5mm to φ5mm and an angle of 30° to 60° with the axial direction.

[0012] Furthermore, the inner diameter of the third inner cavity (1b) is φ8mm~φ12mm, and the depth is 8mm~18mm.

[0013] Furthermore, the upper baffle plate (2) is installed on the top of the second inner cavity of the shell, including: an inner ring and L-shaped protrusions evenly distributed around the inner ring, the connecting surface of the inner ring and the L-shaped protrusions is lower than the surface of the inner ring to form an annular groove (2a), an outer hollow (2b) is formed between the L-shaped protrusions, and several grooves are evenly distributed in the inner ring corresponding to the L-shaped protrusions to form an inner hollow (2c).

[0014] Furthermore, the annular groove (2a) has a width of 1.5mm to 6mm and a depth of 1mm to 3mm; the outer hollow (2b) has a width of 2mm to 6mm and a depth of 2mm to 6mm, and there are 4 to 10 of them; the inner hollow (2c) has a width of 2mm to 6mm and a depth of 1mm to 4mm, and there are 4 to 10 of them.

[0015] Furthermore, the lower baffle plate (3) is installed at the bottom of the second inner cavity of the housing, including: a bottom ring and L-shaped seats evenly distributed on the bottom ring, the top of the L-shaped seat is the upper step surface (3a), the step is the second step surface (3b), and the surface of the bottom ring is the lower step surface (3c).

[0016] Furthermore, the number of upper step surfaces (3a) and second step surfaces (3b) is 3 to 8, and the width is 3 mm to 6 mm; the height difference between upper step surfaces (3a) and second step surfaces (3b) is 2 mm to 6 mm, and the height difference between second step surfaces (3b) and lower step surfaces (3c) is 2 mm to 6 mm.

[0017] Furthermore, the ignition tube (1) is made of aluminum alloy rod, the upper baffle plate (2) is made of stainless steel, the lower baffle plate (3) is made of polytetrafluoroethylene, the ignition propellant is potassium borate nitrate igniter and black powder, and the main charge is modified copper-1A double-base propellant.

[0018] (III) Beneficial Effects

[0019] This invention provides a reliable ignition structure for free-loading pyrotechnic charges. The ignition structure of this invention is a linear charge structure. To ensure reliable ignition, the ignition holes of the ignition propellant are designed as umbrella-shaped spray structures, which improves the effect of the flame and incandescent particles generated after the ignition propellant burns on the surface of the main charge. To ensure the reliable ignition of the tubular pyrotechnic charge and the smoothness of the gas flow field, a unique upper and lower baffle plate structure is designed, making the main charge function more reliable.

[0020] The reliable ignition structure design prepared by this invention enables free-loading of pyrotechnic charges. Through a low-temperature test of ignition margin, the main charge can be reliably ignited even when the amount of ignition charge is 50% of the original amount. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the ignition structure of the present invention;

[0022] Figure 2 This is a schematic diagram of the flame transfer tube structure;

[0023] Figure 3 This is a schematic diagram of the upper baffle plate structure;

[0024] Figure 4 This is a schematic diagram of the lower baffle plate structure. Detailed Implementation

[0025] To make the objectives, contents, and advantages of the present invention clearer, the specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples.

[0026] This invention patent belongs to the field of pyrotechnics technology, and relates to a ignition structure design, particularly a reliable ignition structure design for achieving free-loading pyrotechnic charges. This free-loading pyrotechnic charge ignition structure is a linear charge structure. To ensure reliable ignition, the ignition holes of the ignition propellant are designed as umbrella-shaped spray structures, improving the effect of the flame and incandescent particles generated after the ignition propellant combustion on the surface of the main charge. To ensure reliable ignition of the tubular pyrotechnic charge and smooth gas flow, a unique baffle structure is designed, making the main charge function more reliable.

[0027] To address the issue that the existing ignition structure of free-filled pyrotechnic charges does not ensure reliable ignition of the main charge and smooth gas flow, a new ignition structure for free-filled pyrotechnic charges needs to be designed to improve ignition reliability.

[0028] The present invention provides a reliable ignition structure for realizing free-loading of pyrotechnic charges, comprising: an ignition tube (1) and a main charge fixing structure.

[0029] The ignition tube (1) adopts an integral internal cavity with circumferential ignition holes. The ignition holes are evenly distributed and form an umbrella-shaped spray structure at a certain angle to the axial direction, which facilitates the ignition of the main charge.

[0030] The solidification structure includes an upper baffle plate (2) and a lower baffle plate (3). The upper baffle plate (2) is designed with an inner and outer hollow structure, which enables the flame of the ignition-propellant to effectively act on the inner and outer surfaces of the main charge, improving the reliability of the main charge ignition. The lower baffle plate (3) is designed with a stepped structure, which enables the gas flow field generated after the main charge combustion to be smooth, improving the flowability of the main charge gas exhaust.

[0031] Example 1:

[0032] See appendix Figure 1 ~Attached Figure 4 This embodiment provides a reliable ignition structure for realizing free-loading of pyrotechnic charges, including: an ignition tube (1), an upper baffle plate (2), and a lower baffle plate (3) (as shown in the attached diagram). Figure 1 (As shown).

[0033] The shell is provided with a first inner cavity and a second inner cavity from top to bottom. The first inner cavity is provided with an internal thread. The ignition tube (1) is installed in the first inner cavity by threaded connection and is used to install the ignition propellant. The upper baffle plate (2) and the lower baffle plate (3) are installed in the second inner cavity. The main charge is installed between the upper baffle plate (2) and the lower baffle plate (3).

[0034] The ignition tube (1) has an inverted "mountain" shaped structure with a groove around the protrusion at the bottom. The ignition tube (1) has an external thread on the outside and a third inner cavity (1b) and a fourth inner cavity arranged from bottom to top inside. The third inner cavity (1b) is used to install the ignition propellant, and the fourth inner cavity is used to install the igniter. Several ignition holes (1a) are evenly distributed in the circumference between the third inner cavity (1b) and the groove. The ignition tube (1) adopts an overall internal cavity with circumferential ignition holes. The ignition holes are evenly distributed and form an umbrella-shaped spray structure at a certain angle to the axis, which facilitates the ignition of the main charge.

[0035] Appendix Figure 2 This is a schematic diagram of the fire transmission tube structure. The fire transmission holes (1a) are 4 to 10 evenly distributed holes with a size of φ1.5mm to φ5mm and an angle of 30° to 60° with the axis. The third inner cavity (1b) has an inner diameter of φ8mm to φ12mm and a depth of 8mm to 18mm.

[0036] The upper baffle plate (2) is installed on the top of the second inner cavity of the shell, including: an inner ring and L-shaped protrusions evenly distributed around the inner ring. The connecting surface of the inner ring and the L-shaped protrusions is lower than the surface of the inner ring, forming an annular groove (2a). An outer hollow is formed between the L-shaped protrusions (2b). Several grooves are evenly distributed in the inner ring corresponding to the L-shaped protrusions, forming an inner hollow (2c).

[0037] The annular groove (2a) has a width of 1.5mm to 6mm and a depth of 1mm to 3mm; the outer hollow (2b) has a width of 2mm to 6mm and a depth of 2mm to 6mm, with 4 to 10 grooves; the inner hollow (2c) has a width of 2mm to 6mm and a depth of 1mm to 4mm, with 4 to 10 grooves.

[0038] The lower baffle plate (3) is installed at the bottom of the second inner cavity of the housing, including: a bottom ring and L-shaped seats evenly distributed on the bottom ring, the top of the L-shaped seat is the upper step surface (3a), the step is the second step surface (3b), and the surface of the bottom ring is the lower step surface (3c).

[0039] The number of upper step surface (3a) and second step surface (3b) is 3 to 8, and the width is 3mm to 6mm; the height difference between upper step surface (3a) and second step surface (3b) is 2mm to 6mm, and the height difference between second step surface (3b) and lower step surface (3c) is 2mm to 6mm.

[0040] Example 2:

[0041] During fabrication, the size of the fire transmission hole (1a) is φ2mm and the angle is set to 60°; the size of the third inner cavity (1b) is φ10mm in inner diameter and 10mm in depth.

[0042] The upper baffle plate (2) has an annular groove (2a) with a groove width of 2mm, an outer hollow (2b) with a width of 4mm and a groove depth of 4mm, and a quantity of 8; and an inner hollow (2c) with a groove width of 3mm and a groove depth of 2mm, and a quantity of 8.

[0043] The upper step surface (3a) and the second step surface (3b) of the lower baffle plate (3) are locally protruding planar platforms, numbering 4, with a width of 4mm, and the height difference between the two step surfaces is 3mm; the lower step surface (3c) is a planar platform, and the height difference between the second step surface (3b) and it is 3mm.

[0044] During assembly, the lower baffle plate (3) is first installed in the inner cavity of the shell, then the main charge is installed, then the upper baffle plate (2) is installed, and finally the ignition tube (1) is installed, which contains ignition charge.

[0045] In this embodiment, the preferred material for the fire tube (1) is an aluminum alloy rod.

[0046] In this embodiment, the preferred material for the upper medicine plate (2) is stainless steel.

[0047] In this embodiment, the preferred material for the lower baffle plate (3) is polytetrafluoroethylene.

[0048] In this embodiment, the preferred propellant is potassium borate nitrate igniter and black powder, and the preferred main propellant is modified copper-1A double-base propellant.

[0049] Experiments have shown that the reliable ignition structure for free-filling pyrotechnic charges prepared in this embodiment achieves the following performance: after being kept at -45°C for 6 hours, using 50% of the original boron potassium nitrate igniter and black powder totaling 0.5g (i.e., 0.25g), 13g of the main charge modified black copper-1A can be reliably ignited.

[0050] The ignition structure of this invention is a linear charge structure. To ensure reliable ignition, the ignition holes of the ignition charge are designed as umbrella-shaped spray structures, which improves the effect of the flame and incandescent particles generated after the combustion of the ignition charge on the surface of the main charge. To ensure the reliable ignition of the tubular pyrotechnic charge and the smoothness of the gas flow field, a unique upper and lower baffle plate structure is designed, making the main charge function more reliable.

[0051] The reliable ignition structure design prepared by this invention enables free-loading of pyrotechnic charges. Through a low-temperature test of ignition margin, the main charge can be reliably ignited even when the amount of ignition charge is 50% of the original amount.

[0052] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A reliable transfer structure for achieving free loading of a pyrotechnic charge, characterized in that The reliable ignition structure includes: an ignition tube (1) and a main charge solidification structure; The ignition tube (1) adopts an integral internal cavity with circumferential ignition holes. The ignition holes are evenly distributed and form an umbrella-shaped spray structure at a certain angle to the axial direction, which facilitates the ignition of the main charge. The drug-fixing structure includes an upper drug-blocking plate (2) and a lower drug-blocking plate (3). The upper drug-blocking plate (2) is designed as an inner and outer hollow structure, and the lower drug-blocking plate (3) is designed as a stepped structure. in, The reliable ignition structure also includes: a shell, which has a first inner cavity and a second inner cavity from top to bottom, and the first inner cavity has an internal thread; the ignition tube (1) is installed in the first inner cavity by a threaded connection for installing ignition propellant; the upper baffle plate (2) and the lower baffle plate (3) are installed in the second inner cavity, and the main charge is installed between the upper baffle plate (2) and the lower baffle plate (3); The fire-transfer tube (1) has an inverted "mountain" shaped structure. The bottom protrusion is surrounded by a groove. The fire-transfer tube (1) has an external thread on the outside. The inside has a third inner cavity (1b) and a fourth inner cavity from bottom to top. The third inner cavity (1b) is used to install the ignition powder, and the fourth inner cavity is used to install the igniter. There are several fire-transfer holes (1a) evenly distributed in the circumference between the third inner cavity (1b) and the groove. The fire-transfer tube (1) adopts the method of circumferential fire-transfer holes in the whole inner cavity. The fire-transfer holes are evenly distributed and form an umbrella-shaped spray structure at a certain angle with the axis. The upper baffle plate (2) is installed on the top of the second inner cavity of the shell, including: an inner ring and L-shaped protrusions evenly distributed around the inner ring. The connecting surface of the inner ring and the L-shaped protrusions is lower than the surface of the inner ring, forming an annular groove (2a). An outer hollow is formed between the L-shaped protrusions (2b). Several grooves are evenly distributed in the inner ring corresponding to the L-shaped protrusions, forming an inner hollow (2c). The lower baffle plate (3) is installed at the bottom of the second inner cavity of the housing, including: a bottom ring and L-shaped seats evenly distributed on the bottom ring. The top of the L-shaped seat is the upper step surface (3a), the step is the second step surface (3b), and the surface of the bottom ring is the lower step surface (3c).

2. The reliable transfer structure for achieving a free-loaded initiating charge according to claim 1, wherein, The fire transmission holes (1a) consist of 4 to 10 evenly distributed holes, with a size of φ1.5mm to φ5mm and an angle of 30° to 60° with the axial direction.

3. The reliable transfer structure for achieving a free-loaded initiating charge of claim 1, wherein, The third inner cavity (1b) has an inner diameter of φ8mm~φ12mm and a depth of 8mm~18mm.

4. The reliable transfer structure for achieving a free-loaded initiating charge of claim 1, wherein, The annular groove (2a) has a width of 1.5mm to 6mm and a depth of 1mm to 3mm; the outer hollow (2b) has a width of 2mm to 6mm and a depth of 2mm to 6mm, with a quantity of 4 to 10; the inner hollow (2c) has a width of 2mm to 6mm and a depth of 1mm to 4mm, with a quantity of 4 to 10.

5. The reliable transfer structure for achieving a free-loaded initiating charge of claim 1, wherein, The number of upper step surface (3a) and second step surface (3b) is 3 to 8, and the width is 3mm to 6mm; the height difference between upper step surface (3a) and second step surface (3b) is 2mm to 6mm, and the height difference between second step surface (3b) and lower step surface (3c) is 2mm to 6mm.

6. A reliable transfer structure for achieving a free-loaded initiating charge according to any one of claims 1 to 5, characterized in that, The ignition tube (1) is made of aluminum alloy rod, the upper baffle plate (2) is made of stainless steel, the lower baffle plate (3) is made of polytetrafluoroethylene, the ignition propellant is potassium borate nitrate igniter and black powder, and the main charge is modified black copper-1A double base propellant.

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