摘要 |
Apparatus for generating foam for use in fire fighting having two plates (50 , 60) housed in a chamber (10) which respectively introduce pressurized air an d a water/surfactant solution between the two plates (50, 60) where foam is generated and emitted from an aperture (40) on the side of the chamber (10). The pressurized water/soap solution enters the chamber (10) through an orifi ce (52) in one plate (50). Pressurized air enters the chamber (10) through a number of channels (64) bored through the other plate (60), such channels (6 4) appearing in an annular groove (63) which circumscribes the water inlet (52) . The restricted area (70) balances the pressure between the incoming water an d the incoming air by achieving an equilibrium at some particular radius out from the center of the two plates (50, 60). The apparatus also includes a pressure regulating system (182) that automatically cuts off the flow of pressurized water and air when the foam dispensing nozzle (174) is turned of f. |