| 摘要 |
FIELD: fire-fighting equipment, particularly rechargeable portable fire-extinguishers in which fire-extinguishing substance is stored under pressure created by propellant gas. ^ SUBSTANCE: fire-extinguisher comprises siphon pipe, shutoff-and-triggering device connected to siphon pipe outlet and flow restrictor. Liquid sprayer comprises centrifugal liquid flow swirler and outlet nozzle. Liquid sprayer is connected to shutoff-and-triggering device outlet through pipeline. Outlet liquid sprayer nozzle is formed with profiled channel. Profiled channel inlet is attached to liquid flow swirler outlet. Profiled channel converges in flow direction. Nozzle channel may be formed by inlet converging section and outlet diverging section arranged in series. Profiled channels may define cone or conoid in cross-sections. Centrifugal liquid flow swirler is made as cylindrical insert with axial and tangential channels. Liquid flow restrictor is installed in front of shutoff-and-triggering device inlet to regulate channel area S in dependence on vessel pressure. Area S may be selected from the following condition: 0.5Sc<=S<=2.5Sc, where Sc is minimal area of profiled outlet nozzle channel. Liquid flow restrictor may be formed as valve having movable part having channels in side wall thereof and immovable part coaxial to movable one. ^ EFFECT: possibility to generate gas-and-droplet flow having constant spray angle and flow rate, possibility to obtain necessary distance of liquid throw for the full fire-extinguisher charge distribution process. ^ 7 cl, 4 dwg |
