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    • 3. 发明授权
    • Modular balanced foam flow system
    • 模块化均衡泡沫流量系统
    • US06454540B1
    • 2002-09-24
    • US09539855
    • 2000-03-31
    • John M. TerefinkoRichard L. Taylor
    • John M. TerefinkoRichard L. Taylor
    • F04B4900
    • F04C14/08A62C5/02F04C2220/24G05D11/008G05D11/131
    • A liquid injection arrangement for inserting a foaming agent into water for a fire fighting application, or a similar use, requires that metered quantities of a liquid chemical foamant or other agent be injected into a conduit assembly conveying a water stream. A desired concentration of foamant requires varying the foamant flow as a function of water flow. A tank holds a quantity of liquid chemical foamant, and at least one pump has an inlet port coupled to the tank and an outlet port coupled to the conduit assembly. A hydraulic motor drives the pump and a valve is coupled with the hydraulic motor and a source of pressurized hydraulic fluid. A sensor is placed adjacent to the outlet port of the pump to feed back a signal representing the pressure of the water flowing through the conduit assembly, and a control system is responsive to the signal and to a flow rate of water flowing through the conduit assembly, producing a signal for controlling a speed at which the hydraulic motor drives the foamant pump. A feed-back loop is provided that monitors the flow rate and pressure of the water in order to control the foamant flow. The foamant outlet and the water/foam outlet pressure sensor are placed at substantially the same position in the flow so that the foam addition can be controlled to produce an accurately metered quantity of the liquid foamant in the water stream exiting the conduit assembly and to maintain the desired concentration.
    • 用于将发泡剂插入水中用于消防应用或类似用途的液体注射装置要求将计量的液体化学发泡剂或其它试剂注入输送水流的导管组件中。 所需的发泡剂浓度需要改变作为水流的函数的发泡剂流动。 储罐装有大量的液体化学发泡剂,并且至少一个泵具有联接到罐的入口端口和连接到导管组件的出口端口。 液压马达驱动泵,并且阀与液压马达和加压液压流体源联接。 传感器邻近泵的出口放置,以反馈代表流过管道组件的水的压力的信号,并且控制系统响应于信号和流过管道组件的水的流量 产生用于控制液压马达驱动发泡泵的速度的信号。 提供反馈回路,其监测水的流速和压力以控制发泡剂流动。 泡沫出口和水/泡沫出口压力传感器被放置在流动基本上相同的位置,使得可以控制泡沫添加以在离开管道组件的水流中产生精确计量的液体发泡剂并维持 所需浓度。