DEVICE FOR CHANGE OF BUOYANCY OF SUBMERSIBLE VEHICLE Russian patent published in 1997 - IPC

FIELD: shipbuilding. SUBSTANCE: system for change of buoyancy of submersible vehicle includes ballast tank brought in communication with sea water and provided with vent valve and heating appliance connected to power supply source. Ballast tank is of pressure construction; it is brought in communication with sea water through pressure additional displacing tank included in system. This tank is divided into two chambers by inner partition provided with hole under which floating valve is fitted. Non-return valve is mounted in bottom of lower chamber of tank for communication with surrounding medium, heating appliance being located in upper portion of displacing tank. Lower and upper chambers of displacing tank are connected by means of pipe lines through non-return valves with lower and upper portion s of chamber of ballast tank respectively. Cryogenic fluid, for example, liquid nitrogen is used as working medium for system. Working medium source is connected with upper portion of displacing tank through non-return valve. EFFECT: enhanced reliability. 1 dwg