Repeatable plasma generator

Patent metadata

Field	Value
Publication number	US-11725896-B2
Application number	US-202017781817-A
Country	US
Kind code	B2
Filing date	Dec 1, 2020
Priority date	Dec 20, 2019
Publication date	Aug 15, 2023
Grant date	Aug 15, 2023

Abstract

A plasma generator is provided for initiation of propellant charges in a weapons system, for example when launching projectiles from a barrel weapon, by electrical discharge between a rear electrode and a front electrode in a combustion chamber channel enclosed in a combustion chamber body and filled with filling gas, designed to ignite at least one propellant charge. An ammunition unit and a launching device including the plasma generator are also provided.

First claim

The invention claimed is:

1. A plasma generator for initiation of propellant charges in a weapons system by electrical discharge between a rear electrode and a front electrode in a combustion chamber channel enclosed in a combustion chamber body and filled with filling gas, designed to ignite at least one propellant charge, wherein the plasma generator comprises at least one ionization electrode situated inside the enclosing combustion chamber body, not in physical contact with the combustion chamber body, where ionization electrodes are connected to an initiation circuit, comprising at least one first high-voltage generator, for ionization of the filling gas in the combustion chamber channel, and a second high-voltage generator designed for electrical discharge in the electrically conductive gas from the rear electrode via the at least one ionization electrode onward to the front electrode so that hot ignition gas under high pressure is formed.

2. The plasma generator according to claim 1 , wherein the initiation circuit comprises a first high-voltage generator and at least one circuit breaker connected to the first terminal of at least one capacitor, wherein ionization electrodes are connected to the second terminal of the capacitor.

3. The plasma generator according to claim 2 , wherein the initiation circuit comprises at least one inductance coil connected between the second terminal of the capacitor and the ionization electrodes.

4. The plasma generator according to claim 1 , wherein the ionization electrodes are secured firmly on a conical holder, the ionization electrodes being in open contact with the combustion chamber channel and electrically connected to the initiation circuit.

5. The plasma generator according to claim 4 , wherein the ionization electrodes are arranged in circular symmetry around a center line and an electrical insulator is formed between the ionization electrodes by the conical holder, which is situated at the center of the rear electrode, the conical holder and the rear electrode being arranged such that electrical contact is possible between the initiation circuit and the ionization electrodes.

6. The plasma generator according to claim 1 , wherein the ionization electrodes are designed with at least one flashover conductor at least at one point.

7. The plasma generator according to claim 1 , wherein the rear electrode situated at the rear end of the combustion chamber channel is electrically connected to the second high-voltage generator and the front electrode situated at the front end of the combustion chamber channel is connected to ground, the rear and front electrode being made of an electrically conductive material, and a gas outlet is arranged in the front electrode, emerging at the propellant charge.

8. The plasma generator according to claim 7 , wherein the gas outlet is one of a convergent nozzle or a divergent nozzle or a convergent-divergent nozzle.

9. An ammunition unit comprising a mortar tube, a projectile, a propellant charge and an ignition device, wherein the ignition device comprises the plasma generator according to claim 1 .

10. A launching device comprising a barrel, a propellant charge and an ignition device, wherein the ignition device comprises the plasma generator according to claim 1 .

Assignees

• Bae Systems Bofors Ab

Inventors

• Jansson Mats

Classifications

• F41A19/63 Primary

  having means for contactless transmission of electric energy, e.g. by induction, by sparking gap · CPC title

• F42C19/0811

  characterised by the generation of a plasma for initiating the charge to be ignited · CPC title

• F42C19/0823 Primary

  Primers or igniters for the initiation or the propellant charge in a cartridged ammunition (primers for caseless ammunition F42C19/085) · CPC title