EXPANDER, DAMPER-EXPANDER AND DEVICE FOR ARRANGEMENT THEREOF Russian patent published in 2020 - IPC F41A21/30 

FIELD: weapons and ammunition.

SUBSTANCE: group of inventions relates to blown guns of firearms. Expander is intended for heterogeneous expansion of fast-moving powder gases and consists of cascade of units, which contain vortex chamber and supersonic nozzle with critical section, which provides non-contact passage of missile body. Expansion damper includes housing with inlet chamber and consists of channel for outflow of powder gases and expansion chambers of toroidal shape with conical or cylindrical walls and transverse partitions. Device for providing flow of fast-moving powder gases and maximum possible reduction of noise level comprises a working part with partitions and a body with a cellular structure, similar to porous multichannel diffusion matrix, in which expander and expander-expander are installed.

EFFECT: technical result is reduction of noise level at outflow of rapidly moving powder gases.

4 cl, 8 dwg