公开(公告)号：EP0273832A2

公开(公告)日：1988-07-06

申请号：EP87403003.4

申请日：1987-12-29

申请人： FAIRCHILD WESTON SYSTEMS, INC.

发明人： Kishel, Joseph F.

IPC分类号： G01L13/02 ,  G01L9/10

CPC分类号： G01L9/0085 ,  G01L13/028

摘要： A liquid filled differential pressure detector comprises two pressure sensors. Each sensor is constructed of one or more capsules, which are pairs of diaphragms sealed at their periphries. The innermost diaphragms are interconnected by a tube which contains a rod assembly. The interior of the sensors and interconnection tube form a sealed volume filled with a incompressible liquid. The rod assembly contacts the outermost diaphragm of the sensors and is displaced by expansion and contraction of the capsules caused by a differential pressure change against the outer surface of the sensors. The motion of the rod assembly is transformed into an electrical signal to indicate the pressure measurement. The apparatus is symmetrical about the center point of the tube to reduce error caused by the fluid's thermal expansion by causing equal and opposite forces to cancel, thereby preventing motion of the rod assembly. An overpressure condition results with one sensor completely collapsing with one diaphragm bottoming out against the other, but causes no damage to the capsules due to complementary facing of the diaphragm pairs. The compliance of the diaphragms is chosen to be small enough to cause any gaseous bubbles to be driven into solution during the initial prepressurization of the fluid, ensuring its incompressibility. In a second embodiment, the rod assembly is replaced with a core assembly located at the midpoint of the tube, suspended in a magnetic fluid which separates the incompressible fluid into two identical volumes. The motion of the core assembly, which is due purely to the displacement of the incompressible fluid, is transformed into an electrical signal to indicate a pressure measurement.

摘要翻译： 液体填充差压检测器包括两个压力传感器。 每个传感器由一个或多个胶囊构成，胶囊是在其周边密封的一对隔膜。 最内侧的隔膜通过包含杆组件的管相互连接。 传感器和互连管的内部形成填充有不可压缩液体的密封体积。 杆组件接触传感器的最外面的隔膜，并且由于与传感器的外表面的差压变化引起的胶囊的膨胀和收缩而移位。 杆组件的运动转换成电信号以指示压力测量。 该装置关于管的中心点是对称的，以减少因流体的热膨胀引起的相等和相反的力消除的误差，从而防止杆组件的运动。 超压条件导致一个传感器完全塌陷，一个隔膜相对于另一个隔膜底部，但是由于隔膜对的互补面，不会对胶囊造成损坏。 选择膜片的顺从性足够小以在液体的初始预加压期间使任何气泡被驱入溶液中，确保其不可压缩性。 在第二实施例中，杆组件被位于管中心处的芯组件替代，悬置在磁性流体中，磁流体将不可压缩流体分成两个相同的体积。 核心组件的运动纯粹是由于不可压缩流体的位移而被转换为电信号以指示压力测量。

公开(公告)号：EP0273832A3

公开(公告)日：1990-06-27

申请号：EP87403003.4

申请日：1987-12-29

申请人： FAIRCHILD WESTON SYSTEMS, INC.

发明人： Kishel, Joseph F.

IPC分类号： G01L13/02 ,  G01L9/10

CPC分类号： G01L9/0085 ,  G01L13/028

摘要： A liquid filled differential pressure detector comprises two pressure sensors. Each sensor is constructed of one or more capsules, which are pairs of diaphragms sealed at their periphries. The innermost diaphragms are interconnected by a tube which contains a rod assembly. The interior of the sensors and interconnection tube form a sealed volume filled with a incompressible liquid. The rod assembly contacts the outermost diaphragm of the sensors and is displaced by expansion and contraction of the capsules caused by a differential pressure change against the outer surface of the sensors. The motion of the rod assembly is transformed into an electrical signal to indicate the pressure measurement. The apparatus is symmetrical about the center point of the tube to reduce error caused by the fluid's thermal expansion by causing equal and opposite forces to cancel, thereby preventing motion of the rod assembly. An overpressure condition results with one sensor completely collapsing with one diaphragm bottoming out against the other, but causes no damage to the capsules due to complementary facing of the diaphragm pairs. The compliance of the diaphragms is chosen to be small enough to cause any gaseous bubbles to be driven into solution during the initial prepressurization of the fluid, ensuring its incompressibility. In a second embodiment, the rod assembly is replaced with a core assembly located at the midpoint of the tube, suspended in a magnetic fluid which separates the incompressible fluid into two identical volumes. The motion of the core assembly, which is due purely to the displacement of the incompressible fluid, is transformed into an electrical signal to indicate a pressure measurement.

摘要翻译： 液体填充差压检测器包括两个压力传感器。 每个传感器由一个或多个胶囊构成，胶囊是在其周边密封的一对隔膜。 最内侧的隔膜通过包含杆组件的管相互连接。 传感器和互连管的内部形成填充有不可压缩液体的密封体积。 杆组件接触传感器的最外面的隔膜，并且由于与传感器的外表面的差压变化引起的胶囊的膨胀和收缩而移位。 杆组件的运动转换成电信号以指示压力测量。 该装置关于管的中心点是对称的，以减少因流体的热膨胀引起的相等和相反的力消除的误差，从而防止杆组件的运动。 超压条件导致一个传感器完全塌陷，一个隔膜相对于另一个隔膜底部，但是由于隔膜对的互补面，不会对胶囊造成损坏。 选择膜片的顺从性足够小以在液体的初始预加压期间使任何气泡被驱入溶液中，确保其不可压缩性。 在第二实施例中，杆组件被位于管中心处的芯组件替代，悬置在磁性流体中，磁流体将不可压缩流体分成两个相同的体积。 核心组件的运动纯粹是由于不可压缩流体的位移而被转换为电信号以指示压力测量。