Ammunition and explosives – Igniting devices and systems – Propellant ignitors
Reexamination Certificate
2000-11-20
2003-04-08
Poon, Peter M. (Department: 3643)
Ammunition and explosives
Igniting devices and systems
Propellant ignitors
C102S470000, C102S217000, C102S352000
Reexamination Certificate
active
06543362
ABSTRACT:
BACKGROUND OF THE INVENTION
The invention relates to a high-performance propulsion system having propellant charge powder arranged in a case and a pyrotechnic igniter for igniting the propellant charge powder, the igniter containing a primer and optionally a booster charge; and a method for igniting a high-performance propulsion system of this kind.
The ignition system used today for propellant charge powders in large-caliber ammunition functions predominantly by a pyrotechnic igniter that is housed axially in the rear end of the round. Following triggering by an electrical or mechanical pulse, reaction of the pyrotechnic ignition mixture occurs, and incandescent particles are introduced at high pressure into the bed of propellant powder, igniting the propellant charge. Because of the geometry of the propellant charge igniter, the ignition gases flow radially outward through holes in the metal jacket of the igniter. With a design of this kind, the particle flow also has an axial component. In most cases, however, the first part of the ignition process is limited to the rear portion of the powder bed because of the dimensions of the charge space of modern munitions.
This limitation can result in unfavorable internal ballistic conditions, and can cause destruction of the gun due to locally extreme pressure spikes.
SUMMARY OF THE INVENTION
The goal of the invention is to improve a high-performance propulsion system having propellant charge powder arranged in a case and a pyrotechnic igniter for igniting the propellant charge powder, the igniter containing a primer and optionally a booster charge, in such a way that internal ballistic conditions upon ignition are substantially improved, and even compact charge configurations with a high charge density can thereby be reliably ignited.
According to the present invention, this goal is achieved in that:
multiple igniters are arranged in the case;
all the igniters have a programmable electronic unit in which an individual address is stored;
the igniters are connected via a two-conductor or multi-conductor bus line to an igniter element; and
the igniter element can be connected to a fire-control computer.
As a result, the propellant charge powder can be ignited in controlled fashion at previously selectable points. The number and sequence in time of the ignition events is determined in such a way that, even under extreme environmental conditions, no unfavorable internal ballistic conditions (e.g. negative differential gas pressures) can occur.
In a preferred embodiment, a temperature sensor for measuring the temperature of the propellant charge powder is arranged in the igniter.
The ignition process is coordinated by the fire-control computer, which communicates with the individual igniters via the bus line, e.g. measures the temperature at the individual ignition points and then, based on a previously defined formula, decides as to the number, sequence in time, and physical distribution of the igniters or ignition points to be triggered.
Advantageously, retrievable features of the propellant charge powder are stored in the electronic unit.
The igniters are immovably joined to the inner side of the case, and in a preferred embodiment are embedded in webs extending on the inner side of the case.
The case is of either fully combustible, partially combustible, or incombustible configuration.
The bus line leads to a central ignition element which is preferably embedded in the end-surface closure cover of the case.
The ignition element contains an ignition distributor and a contact screw.
The high-performance propulsion system according to the invention is preferably used for tank-gun ammunition or artillery ammunition.
A method according to the present invention for igniting a high-performance propulsion system as described is characterized by one or more of the steps recited below:
ascertaining the temperature of the propellant charge powder and forwarding it to the fire-control computer;
reading out individual features of the propellant charge powder stored in electronic unit
10
, and forwarding those data to the fire-control computer;
determining, in the fire-control computer, the number and sequence in time of igniters
9
to be ignited, and programming those igniters
9
;
delivering an ignition pulse to igniters
9
.
The invention is therefore characterized by the following features:
Located in the interior of the cartridge are multiple igniters that are immovably joined to the inner side of the cartridge case and ignite radially or at different angles into the powder bed.
The igniters can be embedded in multiple webs extending along the inner side of the cartridge, so as thereby to prevent any damage from propellant powder grains when the cartridge is jostled.
The cartridge case itself can be completely or partly combustible, or incombustible.
The ignition clusters are connected via a two-conductor or multi-conductor bus line to an ignition element.
Located in the igniter is an intelligent electronic unit that can be programmed by a fire-control computer. Each igniter furthermore contains a stored address and a temperature sensor. The temperature in the propellant charge powder bed can thereby be forwarded to the fire-control computer. Features of the propellant charge powder can also be stored in the igniter memory, for interrogation and correction of the fire-control computer.
By means of the bus line, the igniters can be individually addressed or programmed, e.g. as to whether or not they activate in response to the ignition pulse.
This multi-point ignition system is particularly suitable for high-performance propulsion systems, in particular for tank-gun ammunition and artillery ammunition.
With this multi-point ignition system, it is possible to ignite very compact charge configurations having a high charge density, through which a conventional propellant charge igniter can no longer penetrate.
REFERENCES:
patent: 4777881 (1988-10-01), Candland et al.
patent: 4823701 (1989-04-01), Wilhelm
patent: 5071496 (1991-12-01), Coursen et al.
patent: 5263416 (1993-11-01), Amundson et al.
patent: 5705766 (1998-01-01), Farace et al.
patent: 5894103 (1999-04-01), Shann
patent: 6334394 (2002-01-01), Zimmermann et al.
patent: 526835 (1993-02-01), None
Antonelli Terry Stout & Kraus LLP
Copier F.
Dynamit Nobel GmbH Explosivstoff-und Systemtechnik
Poon Peter M.
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