NOISELESS AND FLAMELESS FIXED ROUND Russian patent published in 2008 - IPC F42B5/16 

FIELD: ammunition, mainly for mortars with closing elements on the side of the projectile.

SUBSTANCE: the round has a projectile resting on a tubular pusher of a piston having a blind cavity, with a congruent-shaped cartridge with a powder propellant charge placed in it, the cover of the cartridge made of burning film material joints the central initiating device installed in the flange of the composite case, the flange with the cartridge are screwed together through the obturating lead ring. The powder propellant charge is squeezed to a density of 0.58 to 0.60 g/cu.cm. the cartridge is installed inside the additional diaphragm fixed in the blind cavity of the piston with clearances forming the low-pressure chamber, the total area of the distributed throttling openings of the diaphragm makes up 0.3 to 0.5 of its cross-section area, the piston skirt rest on the coupling grove of the case by means of a circular band at the end, and an obtuse-angled lug is made inside the on its slope, the leg diameter is commensurable with the outside diameter of the case neck.

EFFECT: enhanced reliability.

1 dwg