阅读说明：本技术 提高小尺寸弹头引信隔爆安全性的内腔封堵连接结构 (Inner cavity plugging connection structure for improving explosion-proof safety of small-size warhead fuse ) 是由 王雨时 薛更强 于 2021-08-02 设计创作，主要内容包括：本发明公开了一种提高小尺寸弹头引信隔爆安全性的内腔封堵连接结构,包括引信本体、隔爆件、雷管、保险件和螺接件。本发明在传统的引信本体内腔封口螺纹根部设置退刀槽,在与退刀槽相邻的螺接件内端设置胀环结构,使得引信内雷管在隔爆位置特别是在发射过程中意外发火爆炸时,该螺接件内端胀环正对雷管输出端部位向外变形而卡入引信本体内腔螺纹根部退刀槽,加强了引信内腔底部螺纹的封堵连接强度,从而提高了引信隔爆安全性。该结构原则上不增大隔爆部件的空间尺寸。(The invention discloses an inner cavity plugging connection structure for improving explosion-proof safety of a small-size warhead fuse. According to the invention, the tool withdrawal groove is formed at the root part of the sealing thread in the inner cavity of the traditional fuse body, and the expansion ring structure is arranged at the inner end of the screw joint piece adjacent to the tool withdrawal groove, so that the expansion ring at the inner end of the screw joint piece is outwards deformed to be clamped into the tool withdrawal groove at the root part of the thread in the inner cavity of the fuse body just opposite to the output end part of the detonator at the explosion-proof position, particularly when the detonator is accidentally ignited and exploded in the launching process, and the plugging connection strength of the thread at the bottom of the inner cavity of the fuse is enhanced, thereby improving the explosion-proof safety of the fuse. The structure does not increase the space size of the explosion-proof component in principle.)

1. The utility model provides an improve inner chamber shutoff connection structure of small-size warhead fuse flame proof security which characterized in that: the inner cavity plugging connecting structure is arranged at the bottom of the fuse body (1) and comprises an explosion-proof piece (2), a detonator (3), a safety piece (4) and a screw connector (5); the detonator (3) is arranged in the explosion-proof part (2) and is protected by the safety part (4) at ordinary times, so that the detonator (3) is in an explosion-proof state, namely an inclined position; the explosion transfer agent (6) is arranged in the screw connector (5), the screw connector (5) is fixedly connected with an internal thread at the lower part of an inner cavity of the fuse body (1) through an external thread, the explosion-proof part (2) provided with the detonator (3) is blocked in the inner cavity of the fuse body (1), a tool withdrawal groove is arranged at the root part of the internal thread of the fuse body (1), an expansion ring is arranged on the inner end surface of the screw connector (5), the outer wall of the circumference of the expansion ring is directly opposite to the tool withdrawal groove along the radial direction, so that the output end of the detonator (3) in an inclined position is directly opposite to the inner wall of the expansion ring of the screw connector (5), and the safety part (4) falls on the inner end surface of the screw connector (5).

2. The inner cavity plugging and connecting structure for improving the explosion-proof safety of the small-size warhead fuse according to claim 1, is characterized in that: the inner side of the internal thread root tool withdrawal groove of the fuse body (1) is provided with a fillet not less than R0.3 or a chamfer not less than C0.3.

3. The inner cavity plugging and connecting structure for improving the explosion-proof safety of the small-size warhead fuse according to claim 1, is characterized in that: the outer diameter of the inner end of the screw joint piece (5) is matched with the inner thread small diameter of the fuse body (1), and the wall thickness of the inner end expanding ring of the screw joint piece (5) is 0.3-2 mm.

4. The inner cavity plugging and connecting structure for improving the explosion-proof safety of the small-size warhead fuse according to claim 1, is characterized in that: the root part of the inner side of the inner end expanding ring part of the screw connector (5) is provided with a fillet not less than R0.3.

Technical Field

The invention belongs to the fuse safety technology, and particularly relates to an inner cavity plugging connection structure for improving the explosion-proof safety of a small-size bullet fuse.

Background

When the bullet is launched, the recoil overload is very large, the detonator in the fuse can be accidentally ignited due to the very large recoil overload and impact, and the blocking thread of the inner cavity of the bullet fuse has the superposition effect of the detonation impact load of the detonator and the recoil inertia load, so that the bullet is an extreme working condition. Once the fuse inner cavity blocking threaded connection fails, a screwed connection piece falls off, and high-temperature and high-pressure gaseous products generated by accidental ignition and explosion of the detonator act on explosive charge in the projectile body, so that the projectile can be subjected to chamber explosion or muzzle explosion.

The internal space of the fuse for the small-size bomb is small, and the gas pressure formed in the inner cavity of the fuse is high when the detonator explodes. Meanwhile, the effective number of turns of the thread of the screw connector of the fuse for the small-caliber bomb, such as a bottom screw or a booster tube, is less, and the thread pitch is also smaller. Therefore, the strength of the blocking thread of the inner cavity of the small-size fuse for the bullet cannot be designed enough like that of the middle-size fuse for the bullet. Under the condition that high-emission overload superposition detonators are accidentally fired and exploded to form high-pressure inner cavities, the blocking threads of the inner cavities of the small-size warhead fuzes are likely to fail in shearing strength and fall off from the fuze body or other structural components of the fuze. There have been some grenade fuze products of 20 mm size that have suffered from such problems as chamber explosion during use.

Disclosure of Invention

The invention aims to provide a bullet detonator inner cavity blocking and connecting structure to improve the structural strength and integrity of a detonator when accidental ignition and explosion occur, so that the explosion-proof safety is improved.

The technical solution for realizing the purpose of the invention is as follows: an inner cavity blocking connection structure for improving the explosion-proof safety of a small-size warhead fuse is arranged at the bottom of a fuse body and comprises an explosion-proof part, a detonator, a safety part and a screwed part; the detonator is arranged in the explosion-proof part and is normally protected by the safety part, so that the detonator is in an explosion-proof state, namely an inclined position; the explosion transfer agent is arranged in the screw joint piece, the screw joint piece is fixedly connected with the internal thread at the lower part of the inner cavity of the fuse body through the external thread, the explosion-proof piece provided with the detonator is blocked in the inner cavity of the fuse body, the root part of the internal thread of the fuse body is provided with a tool withdrawal groove, the inner end surface of the screw joint piece is provided with an expansion ring, the outer circumferential wall of the expansion ring is directly opposite to the tool withdrawal groove along the radial direction, so that the output end of the detonator at the inclined position is directly opposite to the inner wall of the expansion ring of the screw joint piece, and the safety piece falls on the inner end surface of the screw joint piece.

Compared with the prior art, the invention has the beneficial effects that: on the premise of simple structure, basically unchanged occupied size and no obvious increase of cost, the dynamic explosion-proof strength, the explosion-proof structural integrity and the explosion-proof safety of the detonator are obviously improved, and the detonator is particularly suitable for small-size ammunition warhead detonators with larger launching overload and smaller inner cavity size.

Drawings

FIG. 1 is a schematic diagram of an inner cavity blocking connection structure for improving the explosion-proof safety of a small-size warhead fuse.

In the figure, 1 is a fuse body, 2 is an explosion-proof part, 3 is a detonator, 4 is a safety part, 5 is a screw connector, and 6 is a booster.

Detailed Description

The present invention is described in further detail below with reference to the attached drawing figures.

With reference to fig. 1, the inner cavity blocking connection structure for improving the explosion-proof safety of the small-size warhead fuse is arranged at the bottom of a fuse body 1 and comprises an explosion-proof part 2, a detonator 3, a safety part 4 and a screw connector 5; the explosion-proof part 2 is spherical, a central through hole penetrating through the spherical center of the explosion-proof part is arranged on the explosion-proof part, the detonator 3 is arranged in the central through hole of the explosion-proof part 2, and the safety part 4 is used for ensuring that the detonator 3 is in an explosion-proof state, namely an inclined position at ordinary times. The detonator transfer explosive 6 in the fuse is arranged in the screw joint piece 5, the screw joint piece 5 is fixedly connected with an internal thread at the lower part of the inner cavity of the fuse body 1 through an external thread, the explosion-proof piece 2 provided with the detonator 3 is blocked in the inner cavity of the fuse body 1, the root part of the internal thread of the fuse body 1 is provided with a tool withdrawal groove, the center of the inner end surface of the screw joint piece 5 is provided with an arc-shaped groove, the inner end surface is provided with an expansion ring, the outer circumferential wall of the expansion ring is directly opposite to the tool withdrawal groove along the radial direction, so that the output end of the detonator 3 in an inclined position is directly opposite to the inner wall of the expansion ring of the screw joint piece 5, the safety piece 4 falls on the inner end surface of the screw joint piece 5, and meanwhile, part of the explosion-proof piece 2 falls on the arc-shaped groove. The lower end of the explosion-proof part 2 is provided with a crescent groove for fixing the safety part 4. The center of the bottom surface of the screw connector 5 is upwards provided with a blind hole, and the booster explosive 6 is arranged in the blind hole and sealed by a bottom cap. The bottom cap is fixed with the screw connector 5 in a riveting mode. And a fillet not less than R0.3 is arranged on the inner side of the tool withdrawal groove at the root part of the internal thread of the fuse body 1. The outer diameter of the inner end of the screw joint 5 is matched with a sealing thread of a fuse inner cavity, namely the small diameter of an inner thread of the fuse body 1 (the diameter of a tool withdrawal groove in a table 2 of GB/T3-1997 'common thread ending, shoulder distance, tool withdrawal groove and chamfer' is selected, and is related to the thread pitch and the large diameter of the thread), and the wall thickness of an expansion ring part of the inner end of the screw joint 5 is 0.3-2 mm. The root part of the inner side of the expansion ring part at the inner end of the screw connector 5 is provided with a fillet not less than R0.3.

In the service processing stage, the inner cavity blocking connection structure for improving the explosion-proof safety of the small-size bullet fuse is the same as the factory assembly state, and has no change.

When the inner cavity blocking connection structure for improving the explosion-proof safety of the small-size bullet fuse is applied to normal launching of the bullet fuse along with a bullet, the safety piece 4 relieves the safety of the explosion-proof piece 2 under the action of the internal environment force (centrifugal force in the embodiment 1), the explosion-proof piece 2 relieves the safety (is aligned) in the extension period of the chamber, and at the moment, the output end of the detonator 3 is over against the top end (input end) of the booster 6, so that the fuse is in a state to be launched.

In the service processing and in-chamber launching stage, when the detonator 3 in the fuse is accidentally fired and exploded due to overload or impact, particularly overload and impact action of in-chamber launching, the screw connector 5 is deformed under the combined action of detonation waves and explosive gas pressure, the expansion ring at the inner end of the screw connector 5 is opposite to the output end part of the detonator 3 and expands outwards along the radial direction, and the expansion ring is clamped into the tool withdrawal groove at the root part of the internal thread of the fuse body 1 and cannot fall off from the fuse body 1.

The inner side of the tool withdrawal groove at the root part of the internal thread of the fuse body 1 is provided with a fillet not less than R0.3, which is beneficial to improving the explosion-proof strength and the explosion-proof structural integrity of the fuse body 1.

The outer diameter of the inner end of the screw connector 5 is matched with the small diameter of the thread, the wall thickness of the expansion ring part of the inner end of the screw connector 5 is 0.3-2 mm, and the connection strength of structural members such as sealing threads at the bottom of the fuse inner cavity and the like under the condition that the detonator is accidentally fired and exploded is favorably ensured and improved as much as possible.

The root part of the inner side of the inner end expanding ring part of the screw connector 5 is provided with a fillet not less than R0.3, so that the effective connection between the inner end expanding ring part of the screw connector and the base body part of the screw connector is prevented from cracking and falling under the condition that the detonator is accidentally ignited and exploded, and the explosion-proof strength and the explosion-proof safety of the fuze are ensured.