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    • 73. 发明授权
    • Automatically controlled cleaning fluid circuit for a foam generating
apparatus and method
    • 用于泡沫发生设备和方法的自动控制清洁流体回路
    • US4073664A
    • 1978-02-14
    • US701703
    • 1976-07-01
    • John F. Zwirlein
    • John F. Zwirlein
    • B05B7/04B01F15/00B05B15/02B29B7/00B29B7/76B29C39/00B29C39/24B08B7/04
    • B01F15/00025B05B15/025B29B7/7605
    • An improvement in an on-site foam generating apparatus which includes storage tanks for supplying the foam-forming reactants, a mixing chamber, and means for conveying the reactants through the mixing chamber. The improvement comprises means for automatically cleaning and flushing the mixing chamber. When the foam gun head containing the mixing chamber is at rest and inverted in an opening on the top of a solvent storage tank, solvent is continuously recycled through the mixing chamber. When the foam gun head is removed from the tank, a proximity switch senses the absence of metal and actuates an electrical circuit to operate a solenoid valve to divert the solvent from the mix chamber to a by-pass back to the tank. Additionally, a time delay relay is actuated which operates a solenoid valve for a predetermined period to supply purging gas to and through the mixing chamber upon removal of the foam gun head from the tank.
    • 现场泡沫发生装置的改进包括用于供应泡沫形成反应物的储罐,混合室和用于将反应物输送通过混合室的装置。 该改进包括用于自动清洁和冲洗混合室的装置。 当包含混合室的泡沫枪头在溶剂储罐的顶部上的开口中静止并倒置时,溶剂通过混合室连续再循环。 当泡沫枪头从罐中取出时,接近开关感测到不存在金属并且致动电路以操作电磁阀以将溶剂从混合室转移到旁路回到罐中。 此外,致动一个延时继电器,其在预定时间段内操作电磁阀,以便在将泡沫枪头从罐中移出时将吹扫气体供应到混合室并通过混合室。