DEVICE FOR PROTECTION AGAINST INGRESS OF WATER INTO INNER SPACE OF NOZZLE OF SOLID-PROPELLANT ENGINE OF ROCKET CARRIER WITH MORTAR START CIRCUIT FROM UNDERWATER POSITION AND CHECK VALVE Russian patent published in 2020 - IPC F02K9/97 F42B15/20 F41F3/07 

FIELD: astronautics.

SUBSTANCE: present invention relates to rocket engineering and can be used in development of design of protection against ingress of water into inner volume of nozzle of starting solid-fuel engine of rocket carrier with mortar start-up circuit from underwater position. Proposed device comprises elastic membrane arranged inside nozzle between critical section plug and rocket launch pad, tightly fixed along the nozzle edge, made in the form of a canopy supported by the ribbed dome frame, in the vertex of which there is a check valve connecting the sealed cavity W_sc with volume of 0.25…0.35 of the complete inner volume of the nozzle from the plug to the cut with inner cavity of the nozzle above the cartridge pressure accumulator (CPA). Membrane is fixed along the nozzle edge from the outside with a compression ring with an unlocking element actuated by a command from the rocket carrier control system. Proposed check valve is designed to provide for the control time of the required filling of CPA start-up gases from the launching tube of the sealed chamber W_sc in gases sufficient for axial displacement of the ribbed frame with eversion of the elastic membrane.

EFFECT: disclosed invention will make it possible to simplify the nozzle protection device design, to increase its reliability in operation and to reduce costs for autonomous development.

2 cl, 7 dwg