Sealing for the differential pressure piston-fuel chamber systems of

Abstract

A sealing arrangement for differential pressure piston-combustion chamber systems, which serve for the generation of propellant gases for barreled firearms from liquid, in particular hypergolic propellant components (hypergolic diergoles), and which are constructed with a differential pressure piston or ram located in the weapon housing, which is axially movable in coaxial relationship with the weapon barrel, and which includes a support piston projecting into the hollow shaft of the differential pressure piston, as well as propellant infeed and propellant discharge passageways. The combustion chamber which connects to the weapon barrel widens conically at a relatively flat angle, and in which the head of the differential pressure piston (injector), which is provided with overflow passageways and nozzles, has its external contour correlated with the cone of the combustion chamber. Hereby, the conically-shaped outer wall or shell surface of the injector can incorporate annular recesses, grooves or the like. The lower surface of these recesses or grooves, for reasons of simplifying the manufacturing technology and production, can be arranged in parallel with the longitudinal axis of the differential pressure piston. Within the cylindrical injector shaft there can be inserted a support piston, and between the support piston and the inner wall or shell of the injector shaft, as well as between the outer wall or shell of the injector shaft and the housing, there can also be, respectively, provided a labyrinth seal.