| 摘要 |
1,213,051. Generating foam. WALTER KIDDE CO. Ltd. 15 Jan., 1969 [15 Jan., 1968], No. 2208/68. Headng B1C. In a fire fighting foam generator of the kind in which gas is blown against a net on which foam forming solution has been deposited, the gas flow is controlled in dependance on the pressure differential across the net. In the Figure pressure transducers 14, 15 control electrically; pneumatically or hydraulically either a shutter 13 in the gas flow, or the speed or pitch of the fan 11; the apparatus is arranged to maintain the pressure difference, and hence the gas flow rate, constant irrespective of the back pressure. As shown the foam generator is sealed into an oil tank 1 in a sea-going tanker and generates foam 4 to discharge the oil 2 through a pipe 5, against a back-pressure varying with the quantity of oil in the tank. The apparatus may also usefully be employed in mines and tunnels.
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