公开(公告)号：US5490425A

公开(公告)日：1996-02-13

申请号：US212272

申请日：1994-03-14

申请人： Kuldip Raj ,  James Torres ,  Susan Lanphear

发明人： Kuldip Raj ,  James Torres ,  Susan Lanphear

IPC分类号： G01L9/00 ,  G01L9/14

CPC分类号： G01L9/14 ,  G01L9/0089

摘要： Mechanically simple, reliable devices for measuring pressure or detecting pressures above a certain limit are disclosed. A representative device includes a magnet surrounded by one or more bands of a ferrofluid, and which is free to move within a nonmagnetic, generally elongated housing. In operation, the housing is oriented vertically, and the lower aperture exposed to the region of pressure to be sensed. The opposite end, which preferably contains another aperture, is exposed to a reference pressure (ordinarily the atmosphere) that remains isolated from the region of pressure to be sensed. Gravity draws the magnet downward, toward the bottom of the housing, while pressure at the lower aperture tends to force the magnet upward. When the force exerted by the pressure source exceeds the downward force of gravity, the magnet travels upward through the housing; this movement may be detected by an appropriate sensing arrangement, and is used to provide a warning signal or a quantitative pressure measurement.

摘要翻译： 公开了用于测量压力或检测压力高于某一极限的机械简单，可靠的装置。 代表性的装置包括由铁磁流体的一个或多个带包围的磁体，并且可以在非磁性的，大致细长的壳体内自由移动。 在操作中，壳体垂直取向，并且下孔暴露于要感测的压力区域。 优选地包含另一个孔的相对端被暴露于保持与要感测的压力区域隔离的参考压力（通常为大气）。 重力将磁铁向下拉，朝向壳体的底部，而在下孔处的压力倾向于迫使磁铁向上。 当压力源施加的力超过向下的重力时，磁体向上通过壳体; 该移动可以通过适当的感测装置来检测，并且用于提供警告信号或定量压力测量。