FOAM GENERATOR FOR PRODUCING AN AIR FOAM PARTICULARLY A FIRE EXTINGUISHING FOAM

摘要

1344417 Foam generator G ROTVAND 3 May 1972 [22 Feb 1972] 20662/72 Heading B1C A foam generator has one or more nozzles 4 forming jets of liquid with a divergence of 45‹-80‹ which aspirate air through an aperture 6 and strike walls and/or intersect each other upstream of a screen 7. The walls may be those of the mixing chamber 1, which may be of circular or rectangular cross-section. As shown the screen is conical with its apical portion inverted, but it may be flat or pleated, see Figs. 5 and 6 (not shown). A high expansion foam of foam/liquid ratio up to 1,000 is said to be produced.