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2. 发明授权

US06752024B2 Valve packing gland pressure sensing by capacitance measurement 失效
标题翻译：通过电容测量的阀门压力压力感测
公开(公告)号：US06752024B2
公开(公告)日：2004-06-22
申请号：US10191090
申请日：2002-07-09
申请人： Neil R. Davie , E. Michael Coffey
发明人： Neil R. Davie , E. Michael Coffey
IPC分类号： G01B716
CPC分类号： F16K37/0041 , F16K41/02 , G01L1/142 , G01L1/144
摘要： A thin flat disk-like capacitive load sensor of layered sandwich construction having a central opening and a circular outer periphery for installation above a packing follower or beneath the packing follower or packing gland. The load sensor has a thin first and second insulating outer layer between which an inner layer is secured. The inner layer is formed of dielectric material having a known dielectric constant, a first face having at least one thin electrically conductive circular ring surrounding the central opening in coaxial radially spaced relation, and a second face having a thin electrically conductive circular ring surrounding said central opening in coaxial radially spaced relation. The inner and outer layers contain electrical conductors engaged with respective electrically conductive circular rings on the opposed faces that are adapted to be connected with an electrical measurement apparatus. As the inner layer is compressed the spacing between the electrically conductive rings on the opposed faces is decreased such that compressive force on the packing can be measured as a function of the change in capacitance of the sensor. Proper compression of the padding can be achieved by monitoring during installation. Follow-up sampling or continuous measurement of packing compression provides early detection prior to packing failure to allow corrective action.
摘要翻译：具有中心开口和圆形外周边的层状夹层结构的薄平板状电容式负载传感器，用于安装在填料随动体之下或填料随动体或填料压盖下方。负载传感器具有薄的第一和第二绝缘外层，在其之间固定有内层。内层由具有已知介电常数的电介质材料形成，第一面具有至少一个以同轴径向隔开的关系围绕中心开口的薄导电圆环，第二面具有围绕所述中心的薄导电圆环以同轴径向间隔的关系开口。内层和外层包含与相对面上相应的导电圆环接合的电导体，其适于与电测量装置连接。当内层被压缩时，相对面上的导电环之间的间距减小，使得可以测量作为传感器的电容变化的函数的包装上的压缩力。可以通过在安装过程中进行监控来实现衬垫的正确压缩。后续采样或连续测量包装压缩在包装失败之前提供早期检测，以允许纠正措施。

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