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    • 4. 发明授权
    • Liquid sensing
    • 液体传感
    • US06813946B1
    • 2004-11-09
    • US10457216
    • 2003-06-09
    • Frances H. Benton
    • Frances H. Benton
    • G01F2330
    • G01F23/72G01F23/0038G01F23/68G01F23/74
    • Liquid sensing apparatuses and liquid sensing methods are described. In some embodiments, a liquid sensing apparatus includes a magnetic element; a source magnetic field, which produces on the magnetic element a magnetic force with a component that opposes a gravitational force on the magnetic element; and a structure configured to prevent rotation of the magnetic moment of the magnetic element relative to the magnetic field, e.g., so that the magnetic force remains greater than the gravitational force. The apparatus is capable of sensing the level of a liquid using a combination of magnetic force and buoyancy force.
    • 液体检测装置和液体检测方法被描述。 在一些实施例中,液体感测装置包括磁性元件; 源极磁场,其在磁性元件上产生具有与重力对应于磁性元件的分量的磁力; 以及被配置为防止磁性元件相对于磁场的磁矩的旋转的结构,例如使得磁力保持大于重力。 该装置能够使用磁力和浮力的组合来感测液体的液位。
    • 5. 发明授权
    • Locking ball valve for a fluid conduit
    • 用于流体导管的锁定球阀
    • US5632294A
    • 1997-05-27
    • US669639
    • 1996-06-24
    • Frances H. Benton
    • Frances H. Benton
    • F16K5/06F16K35/00
    • F16K35/00F16K5/0605Y10T137/0318
    • A locking valve for controlling fluid flow within a conduit has a spring-biased detent in fluid communication with a fluid source. A movable valve structure prevents fluid flow through the conduit in a closed position and enables fluid flow through the conduit in an open position. Movement of the valve structure from the closed position to the open position is obstructed by the detent when fluid pressure in the conduit is below a predetermined pressure. An increase in fluid pressure, however, moves the detent against the spring bias, removing the obstruction to movement of the valve structure, and allowing the valve structure to be moved to the open position. Thus, accidental or intentional drainage of the conduit when the fluid pressure source is inactive is avoided.
    • 用于控制管道内的流体流动的锁定阀具有与流体源流体连通的弹簧偏置的止动件。 可移动阀结构防止流体在封闭位置流过管道,并使流体能够在打开位置流过管道。 当管道中的流体压力低于预定压力时,阀门结构从关闭位置向打开位置的移动被制动器阻挡。 然而,流体压力的增加使得止动件抵抗弹簧偏压移动,消除阻塞阀结构的移动,并允许阀结构移动到打开位置。 因此,避免了当流体压力源不活动时导管的意外或有意的排水。
    • 10. 发明授权
    • Fluoropolymer fluid overfill probe with infrared optical signal
    • 含红外光信号的含氟聚合物液体填满探头
    • US06448573B1
    • 2002-09-10
    • US08599192
    • 1996-02-09
    • Frances H. Benton
    • Frances H. Benton
    • G01N1506
    • G01F23/2927G02B5/04Y10S250/903
    • An optically-based overfill detection probe is provided that has a prism with a substantially quadrilateral cross-sectional shape, such that internal reflection angles are less than ninety degrees. The prism is made of a fluoropolymer, preferably TEFLON® PFA, and uses an infrared optical signal. The prism material has a high resistance to chemical solvents, has high signal transmission in the infrared (IR) wavelength range, is less prone to condensation and frost than plastic or glass, and enables the production of prisms at significantly less cost than glass. The substantially quadrilateral cross-sectional shape of the prism, in itself, has the advantage of allowing angles of incidence much less than ninety degrees on internal prism surfaces, thus reducing signal loss from surface irregularities. The probe also includes a two-piece housing structure that compresses an outwardly-extending portion of the prism material to firmly hold the prism in place, and force the material into sealing contact with an inner surface of the housing. The housing has an elongate portion which encompasses the prism, and which extends toward the fluid, preventing any light which escapes the prism from being externally reflected back to the photodetector of the probe.
    • 提供一种基于光学的过充填检测探针,其具有基本四边形横截面形状的棱镜,使得内部反射角小于九十度。 棱镜由氟聚合物制成,优选为PFA,并使用红外光信号。 棱镜材料对化学溶剂具有很高的耐受性,在红外(IR)波长范围内具有高信号传输,与塑料或玻璃相比,不易冷凝和结霜,并且能够以比玻璃低得多的成本生产棱镜。 棱镜本质上四边形的截面形状本身具有允许入射角在内棱镜表面上远低于九十度的入射角的优点,从而减少了表面不规则的信号损失。 该探头还包括两件式的外壳结构,其压缩棱镜材料的向外延伸的部分以将棱镜牢固地保持在适当位置,并且迫使材料与壳体的内表面密封接触。 壳体具有包围棱镜并且朝向流体延伸的细长部分,防止任何逸出棱镜的光从外部反射回探测器的光电检测器。