Patent ID: 7229067
Filing Date: 2007-06-12
Classification: A62C,Y10S

Abstract:
1. A foam-generating assembly comprising: a foam generator which includes a header that is hollowed out to provide a swirl chamber defined by an outer cylindrical wall, an inner cylindrical wall and a floor; a first passageway that extends from an inlet end to an outlet end at the center of said floor, a spray nozzle connected to said outlet end of said first passageway for emitting a spray of aqueous liquid into the center of said swirl chamber; a second passageway that extends from an inlet end to an outlet orifice in said inner cylinder wall for emitting a tangential flow of gas into the swirl chamber and around said spray of aqueous liquid so as to create a vortex flow of a mixture of gas and aqueous liquid droplets; a first foaming screen through which said vortex flow of a mixture of gas and aqueous liquid droplets will pass to form a coarse gas-containing foam, and a second foaming screen through which said coarse foam will pass to provide a fine foam; a first tank containing foamable aqueous liquid communicating with said inlet end of said first passageway, and a second tank containing pressurized gas in communication with said inlet end of said second passageway.