SFRE NOZZLE BLOCK Russian patent published in 2020 - IPC F02K9/97 F02K9/84 

FIELD: astronautics.

SUBSTANCE: disclosed technical solution relates to rocket engineering and can be used in development of nozzle blocks (NB) of rocket engines on solid fuel (SFRE). Proposed NB of SFRE consists of casing, plug of nozzle fixed on body, rigid overrunning nozzles and flexible unfolding nozzle tightly fixed on end of last rigid nozzle and made of thin-walled heat-resistant composite material. Flexible nozzle flange is equipped with end collar and power frame, consisting of heat resistant rods, uniformly installed on outer side of flexible attachment, one end of hinges is rigidly coupled with rocking pins by one end of appropriate holes in end flange and opposite end. Said hinges are fitted on lugs arranged at the edge of last rigid adapter. Output of rods and nozzle into working position is provided by torsion springs located at folded flexible attachment in stressed state, fixed by one end on fixed lugs fixed on end of last rigid nozzle, and by another end - on rockers. In order to hold the flexible attachment in the folded state, the NB structure is equipped with a retainer made in the form of a disc with a central pin installed on the nozzle plug and having a separation mechanism connected to the control system. At withdrawal of previous stage with adapter to mechanism of separation of pin command is given to its separation and release of flexible attachment from retainer. Under action of torsion springs rods turn rods and flexible nozzle to operating position provided by rod turn limiters. All nozzle is brought into working position after engine starting, by pushing nozzle plug with working pressure of engine, which pulls out rigid nozzle flanges with unfolded flexible nozzle.

EFFECT: possibility of increasing NB output diameter to sizes exceeding missile diameter, allows to increase SFRE power characteristics.

1 cl, 4 dwg