FIRE WATER-PENETRATING SHAFT GENERATING FOAM OF AVERAGE MULTIPLICITY Russian patent published in 2019 - IPC A62C31/00 

FIELD: fire extinguishing devices.

SUBSTANCE: fire water-intake shaft relates to fire extinguishing devices, namely, to fire barrels. To achieve the technical result, a single-flow structure is created, in which the nozzle performs functions of formation and supply of foam, in which the foam generator is made with two successive crossings along the flow with mutually perpendicular flow sections, compressed in range from 1:3 to 1:2 to the inlet diameter of the foam generator, surface of the nozzle case and plate core in the zone of formation of the jet are made with conoidal surfaces at the inlet and with conical convergent surfaces at the outlet, with narrowing of the flow cross-section from the inlet to the outlet. Diameter of dish-shaped core and annular slot clearance at jet outflow from nozzle between plate-type core and nozzle housing, which influence technical parameters, are taken as per indices of foam ratio Kp = 40 and more and foam dispersion with arithmetic mean diameter of bubbles of foam D = 0.5 mm and less. Proposed technical solutions using several hydrodynamic effects at the same time make it possible to create optimal conditions for production of homogeneous foam of average multiplicity at long range of supply, to considerably reduce dimensions and weight, as well as losses of pressure in the barrel. At supply of foam a stable layer of foam of average multiplicity, having high fluidity and fire-extinguishing properties is formed. According to the proposed technical solutions, the entire range of barrels can be made with consumption in solution of 20 to 150 l/s, which enables to almost completely solve the task of mastering and implementing a new technology for extinguishing large fires of classes B (and A) with foams with Kp = 30 ± 10, LH-GH, including at large reservoirs of RVS type. This will make it possible to eliminate deficiency in the country of foam generators of homogeneous foam with multiplicity Kp = 30 ± 10, which provides maximum efficiency of suppression of large fires of the specified type.

EFFECT: creation of device with continuous and sprayed jets on water and foam with variable spraying angle, which generates and supplies single-flow foam with improved ballistic indices in range, forming foam of average multiplicity of increased fluidity, simplified design, with reduced size and weight and reduced hydraulic losses.

1 cl, 1 dwg