NITROGEN FIRE EXTINGUISHING SYSTEM FOR SPECIAL STRUCTURE Russian patent published in 2021 - IPC A62C35/00 

FIELD: gas fire extinguishing systems.

SUBSTANCE: invention relates to gas fire extinguishing systems and can be used, for example, in enclosed spaces and underground structures, in particular underground special fortifications (SF). In the event of a fire in one (or several) of the rooms 2 and the appearance of smoke, a fire detector 10 located in this room 2 is triggered, and a signal is sent from it to the control unit 12. From the control unit 12, the control signal is sent to the actuator of the shut-off valve 9 of the corresponding distribution line 8 for the supply of compressed nitrogen. This control signal gives the command to open the shut-off valves 9 of the distribution line 8. After that, the compressor 15 is started and the flue gases from the burning room 2 are sucked into the corresponding flue gas outlet line 16 at the level of the ceiling surface and then enter the intermediate flue gas tank 13, from where, with the help of the compressor 15, they are removed from the special fortification 1 through the shaft 4 into the environment along the smoke-removal line 14. The location of the gas ejector 17 at the end of each distribution line 8 makes it possible to use flue gases formed as a result of combustion as an additional source of neutral gas to reduce the concentration of oxygen and increase the extinguishing rate by intensifying the volume of extinguishing gas due to the use of a mixture of nitrogen and flue gases sucked from the internal volume of the room 2, where the fire occurred, through the passive gas pipeline 18 from the upper part of the room 2.

EFFECT: increased safety of operation of the nitrogen fire extinguishing system and the speed of fire extinguishing, reduced nitrogen consumption for extinguishing fire foci, as well as the possibility of purging the internal volume of an isolated room after extinguishing the fire.

1 cl, 1 dwg