CN113251876A

CN113251876A - Insensitive flying piece detonating detonator for perforating bullet

Info

Publication number: CN113251876A
Application number: CN202010083741.6A
Authority: CN
Inventors: 王雨时; 肖剑; 闻泉
Original assignee: Nanjing University of Science and Technology
Current assignee: Nanjing University of Science and Technology
Priority date: 2020-02-10
Filing date: 2020-02-10
Publication date: 2021-08-13
Anticipated expiration: 2040-02-10
Also published as: CN113251876B

Abstract

The invention discloses an insensitive flying piece detonating cap for a perforating bullet, which comprises a conducting wire, a tube shell, a sealing plug, an exciting explosive inner tube, exciting explosive, a flying piece, intermediate explosive, high-density explosive and memory alloy, wherein the high-density explosive is positioned at the lowest part in the tube shell, the intermediate explosive is positioned above the high-density explosive, a flying piece accelerating cavity is arranged between the intermediate explosive and the flying piece, the exciting explosive tube shell and the exciting explosive are positioned above the flying piece, the sealing plug is fixed in an opening at the top of the tube shell, the conducting wire penetrates through the sealing plug and the exciting explosive tube shell to be contacted with the top of the exciting explosive, the memory alloy is positioned in the flying piece accelerating cavity, the memory alloy cannot interfere with the flying piece when the detonating cap normally detonators, the memory alloy can deform at a preset high temperature, and if the sensitive exciting explosive is detonated at the preset high temperature, the deformed memory alloy can obstruct the impact of the flying piece on the intermediate explosive. The invention solves the problem that the flying plate type detonator used by the perforating bullet in the prior art is accidentally detonated when the flying plate type detonator is violently raised due to the burning of fire due to the ambient temperature.

Description

Insensitive flying piece detonating detonator for perforating bullet

Technical Field

The invention belongs to the field of civil initiating explosive devices, and particularly relates to an insensitive flying piece detonating primer for a perforating bullet.

Background

At present, the flying piece priming detonator mainly comprises a lead 1, a tube shell 2, a sealing plug 3, an excitation explosive inner tube 4, excitation explosive 5, a flying piece 6, a middle explosive 7 and a high-density explosive 8, and is shown in figure 1. The flying piece priming detonator can be rapidly detonated under the excitation of electric energy, but does not have the insensitive characteristic, and the safety is great.

Flyer initiation detonators are widely used in perforating charges as initiation elements. For the perforating bullet, the detonator meets the requirement during normal operation and can quickly and reliably fire. However, when the external environment temperature rises sharply due to the fire, the detonator may be accidentally fired, and further, the perforating charge may be accidentally exploded.

Disclosure of Invention

The invention aims to provide a insensitive flying piece detonating primer for a perforating bullet, which aims to solve the problem that the flying piece detonating primer used by the perforating bullet in the prior art is accidentally detonated when the flying piece detonating primer is violently raised due to the burning of fire at the ambient temperature.

In order to achieve the purpose, the technical scheme adopted by the invention is as follows:

a insensitive flying piece detonating cap for a perforating bullet comprises a lead, a tube shell, a sealing plug, an exciting powder inner tube, exciting powder, a flying piece, intermediate charging and high-density charging, wherein the sealing plug, the exciting powder inner tube, the exciting powder, the flying piece, the intermediate charging and the high-density charging are positioned in the tube shell, the high-density charging is positioned at the lowest part in the tube shell, the intermediate charging is positioned above the high-density charging, the flying piece is positioned above the intermediate charging, a flying piece accelerating cavity is arranged between the intermediate charging and the flying piece, the exciting powder tube shell and the exciting powder are positioned above the flying piece, the exciting powder is positioned in the exciting powder tube shell, the sealing plug is fixed in an opening at the top of the tube shell, the lead passes through the sealing plug and the exciting powder tube shell to be in contact with the top of the exciting powder, the memory alloy is positioned in the flying piece accelerating cavity, and the memory alloy does not interfere with the flying piece when the detonating cap is normally, the memory alloy deforms at the predetermined elevated temperature, and if the sensitive propellant is detonated at the predetermined elevated temperature, the deformed memory alloy impedes the impact of the flyer on the center charge.

Preferably, the inner surface of the flyer accelerating cavity is circumferentially provided with an annular groove, and the memory alloy is annular and is positioned in the annular groove.

Preferably, the memory alloy is a two-way memory alloy.

Compared with the prior art, the invention has the remarkable advantages that:

the invention is suitable for perforating bullets, when the external environment temperature rises sharply, the annular memory alloy deforms after being subjected to overhigh temperature, the radius of an inner hole of the deformed memory alloy is reduced and becomes a flat annular shape, the deformed memory alloy forms a barrier above the intermediate charge, and if the sensitive initiating explosive is detonated at overhigh temperature, the deformed memory alloy can block the impact of the flying piece on the intermediate charge to ensure the failure of the detonator.

Drawings

Fig. 1 is a schematic structural view of a prior art flying piece primer detonator.

Fig. 2 is a schematic structural diagram of the insensitive flying piece detonating primer for the perforating charge of the invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

The following describes the implementation of the present invention in detail with reference to specific embodiments.

Referring to fig. 2, the insensitive flying piece detonating primer for perforating bullets comprises a lead 1, a tube shell 2, a sealing plug 3, an excitation explosive inner tube 4, excitation explosive 5, a flying piece 6, a middle charge 7 and a high-density charge 8, wherein the sealing plug 3, the excitation explosive inner tube 4, the excitation explosive 5, the flying piece 6, the middle charge 7 and the high-density charge 8 are positioned in the tube shell 2, the high-density charge 8 is positioned at the lowest part in the tube shell 2, the middle charge 7 is positioned above the high-density charge 8, the flying piece 6 is positioned above the middle charge 7, a flying piece accelerating cavity is arranged between the middle charge 7 and the flying piece 6, the excitation explosive tube shell 4 and the excitation explosive 5 are positioned above the flying piece 6, the excitation explosive 5 is positioned in the excitation explosive 4, the sealing plug 3 is positioned in an opening at the top of the tube shell 2 and is fixed by a necking of the tube 2, the lead 1 passes through the sealing plug 3 and the excitation explosive shell 4 to be in contact with the top of the excitation explosive 5, the detonation gun further comprises a memory alloy 9, the memory alloy 9 is located in the flying piece accelerating cavity, the memory alloy 9 does not interfere with the flying piece 6 when the detonation detonator is normally detonated, the memory alloy 9 can deform at a preset high temperature, and if the sensitive initiating explosive 5 is detonated at the preset high temperature, the deformed memory alloy 9 can hinder the impact of the flying piece 6 on the middle charging 7.

Further, the inner surface of the flyer accelerating cavity is circumferentially provided with an annular groove, and the memory alloy 9 is annular and is positioned in the annular groove.

Further, the memory alloy 9 is a two-way memory alloy.

The invention improves the prior flying piece detonating cap into an insensitive flying piece detonating cap, and utilizes the characteristic of high-temperature deformation of the memory alloy 9 to open a ring groove on the inner periphery of the accelerating cavity of the detonator shell 2 and put the memory alloy 9. Under normal conditions, the detonator receives electrical ignition energy via the wire 1, which detonates the propellant 5. The flying plate 6 flies to the intermediate charge 7 rapidly under the detonation action of the exciting powder 5, so that the intermediate charge 7 is detonated, and then the high-density charge 8 is detonated, thereby realizing the ignition of the detonator. Under the condition of the high temperature generated by fire, the sensitive excitant 5 can be affected by high temperature to self-ignite, but the memory alloy 9 is deformed by the high temperature, the radius of the inner hole of the deformed memory alloy 9 is reduced to form a flat circular ring shape, and the deformed memory alloy 9 forms a barrier above the intermediate charge 7. If the sensitive initiator 5 is detonated at an excessive temperature, the deformed memory alloy 9 can hinder the impact of the flying disc 6 on the intermediate charge 7, so that the detonator fails, and a booster sequence also fails, thereby avoiding the accidental explosion of the perforating charge caused by the excessive temperature.

The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. A insensitive flying piece initiation detonator for a perforating bullet comprises a lead (1), a tube shell (2), a sealing plug (3), an excitation explosive inner tube (4), excitation explosive (5), a flying piece (6), middle explosive (7) and high-density explosive (8), wherein the sealing plug (3), the excitation explosive inner tube (4), the excitation explosive (5), the flying piece (6), the middle explosive (7) and the high-density explosive (8) are positioned in the tube shell (2), the high-density explosive (8) is positioned at the lowest part in the tube shell (2), the middle explosive (7) is positioned above the high-density explosive (8), the flying piece (6) is positioned above the middle explosive (7), a flying piece accelerating cavity is arranged between the middle explosive (7) and the flying piece (6), the excitation explosive tube (4) and the excitation explosive tube (5) are positioned above the flying piece (6), the excitation explosive (5) is positioned in the excitation explosive tube shell (4), the sealing plug (3) is fixed in an opening in the top of the tube shell (2), the lead (1) penetrates through the sealing plug (3) and the excitation powder tube shell (4) to be in contact with the top of the excitation powder (5), the explosion-proof detonator is characterized by further comprising a memory alloy (9), the memory alloy (9) is located in the flyer accelerating cavity, the flyer (6) cannot be interfered by the memory alloy (9) when the initiation detonator is normally detonated, the memory alloy (9) can deform at a preset high temperature, and if the sensitive excitation powder (5) is detonated at the preset high temperature, the deformed memory alloy (9) can block the flyer (6) from impacting the middle charging (7).

2. The insensitive flying disc primer cap for perforating charge of claim 1, characterized in that the inner surface of the flying disc accelerating cavity is provided with an annular groove in the circumferential direction, and the memory alloy (9) is annular and is positioned in the annular groove.

3. The insensitive flying chip initiation detonator for perforating charge as claimed in claim 1 or 2, characterized in that the memory alloy (9) is a two-way memory alloy.