| 摘要 |
PURPOSE:To obtain the highly reliable device which can detect the flow rate and the flow rate changing rate of fluid by one detecting device, by detecting the displacement and its rate of change of a movable orifice in a pipe through coils provided on the outer wall of the pipe. CONSTITUTION:In the pipe 1, wherein the fluid flows, a fixed orifice 2 and the movable orifice 6, which is moved in the inside of the pipe 1 by the differential pressure yielded before and after a restrictor in repsonse to the flow rate of the fluid, are provided, and an area flowmeter is constituted. The movable orifice body 6A is made of a magnet of a ferromagnetic body. A tip 6B of the movable orifice is formed by a nonmagnetic body. Furthermore, a primary coil 8 for AC excitation, which is wound along the moving range of the movable orifice 6 and two detecting secondary coils 10 and 11 which detect the moving displacement and its rate of change of the movable orifice 6 are provided on the outer wall of the pipe 1. Said secondary coils 10 and 11 are connected to a computing device 12. The displacement and the component of its rate of change of the orifice 6 are separately outputted. |
