POWDER FIRE EXTINGUISHING METHOD AND DEVICE

FIELD: fire-fighting, particularly unmanned powder systems for surface or volumetric extinguishing of class A, B and C fires and electric equipment with voltage up to 1000 V in coal, metal mining, chemical, oil and atomic industries, in transport and in civil, industrial and residential buildings, offices and garages. ^ SUBSTANCE: method involves delivering previously-aerated gas-and-powder mixture including fire extinguishing powder and retarding gas into volume or to surface to be protected, wherein the delivering is performed with the use of high-pressure containers with spraying nozzles uniformly distributed over the volume or the surface to be protected. Pressure is selected to overcome fire heat depression with rate exceeding fire heat flow rate; performing free gas-and-powder mixture flow into volume or to surface to be protected. Fire-extinguishing device comprises at least two containers with fire-extinguishing powder. Each container is provided with spraying nozzles with opening pressure regulation and connected to common retarding gas source through powder aerator formed as radial tubes with orifices and valves. Containers are united with retarding gas source through tubular channel into common pipeline. Vents leading from pipeline to each container are provided with shutoff valves connected with holders for pipeline securing. Each shutoff valve comprises body with cylindrical inlet connection pipe at least partly arranged inside the body and installed coaxial thereto. Inlet connection pipe has closed bottom. Cylindrical outlet connection pipe slides over the body and is brought into contact with the body by means of sealing member arranged in annular groove made in lower part thereof. Lower sealing member end is to be engaged with inner annular extension of lower body part by outer annular extension thereof to prevent axial displacement of outlet connection pipe beyond the body. Connection pipes are provided with side cuts communicating one to another through inner volume of shutoff valve body. Outlet connection pipe may move together with container attached thereto in direction opposite to gas-and-powder mixture delivery direction to seal inlet connection pipe orifices by side surface thereof. Each container is provided with inlet pipe to which aerator pipes are connected in gas-dynamic manner. Spraying nozzles provide operation of all containers simultaneously, one by one or selectively and free gas-and-powder mixture delivery under pressure