Progressive propellant charge with high charge density

F - Mech Eng,Light,Heat,Weapons – 42 – B

Patent

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F42B 1/00 (2006.01)

Patent

CA 2548523

The resent invention relates to a method for producing propellant charges with progressive combustion characteristic and a higher charge density than previously considered possible to achieve, intended in the first instance for direct-firing barrel weapons such as tank cannons. Combined in the charge that is characteristic of the invention are at least two radially perforated propellant tubes (10-12, 28-30, 48-52) which are arranged in their entirety inside or after one another, which process, at an e-dimension selected in relation to the actual type of propellant and its desired combustion characteristic, combustion or ignition channels (2, 19-21, 37), and which have circular outer and inner boundary surfaces, in conjuction with which, before initiation of the charge, at least one of the total number of outer surfaces of these propellant tubes that are available for initiation has been treated with an inhibition, surface treatment or surface coating (13-18, 33-36) intended to delay the propagation of ignition to that surface, so that the combustion of the propellant tubes is partially mutually overlaping and taken together, gives rise to a maximum propellant gas pressure behind a projectile fired with the charge from the barrel in question, which pressure, for the entire passage of the projectile through the barrel, lies close to the applicable Pmop value for the barrel ( the maximum operational pressure, i.e. the highest barrel pressure that can be permitted continously).

La présente invention se rapporte à un procédé permettant de produire des charges propulsives présentant des caractéristiques de combustion progressive et une densité de charge supérieure à celle que les techniques antérieures permettaient d'atteindre, lesdites charges propulsives étant destinées principalement à des armes à canon à tir direct, telles que des canons de chars. La charge selon l'invention comprend au moins deux tubes propulseurs dotés de perforations radiales (10-12, 28-30, 48-52), qui sont entièrement disposés à l'intérieur ou à la suite l'un de l'autre. Lesdits tubes possèdent, à une dimension e sélectionnée par rapport au type de propulseur utilisé et à ses caractéristiques de combustion désirées, des canaux de combustion ou d'allumage (2, 19-21, 37), ainsi que des surfaces limites externes et internes circulaires, en conjonction avec lesquelles, avant l'amorçage de la charge, au moins l'une des surfaces externes desdits tubes propulseurs disponibles pour l'amorçage a été traitée avec un traitement ou un revêtement de surface (13-18, 33-36) d'inhibition, destiné à retarder la propagation de l'allumage à ladite surface. De cette manière, la combustion des tubes propulseurs se chevauche partiellement et, accumulée, génère une pression de gaz propulseur maximale derrière un projectile tiré avec la charge à partir du canon en question, laquelle pression, sur l'ensemble du passage du projectile à travers le canon, est proche de la valeur Pmop applicable pour le canon (il s'agit de la pression opérationnelle maximale, c'est-à-dire la pression du canon maximale qui peut être obtenue en continu).

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