| 摘要 |
PURPOSE:To detect a flow rate stably with high accuracy even in a low flow rate range by providing a vortex chamber which has circular horizontal section and consists of a cylinder part and a nearly conic shape connecting with its upper part. CONSTITUTION:Fluid enters the vortex chamber 6 from an intake 9 provided in the tangential direction of the nearly conic part 8, becomes a vortex flow while flowing round the internal wall of the vortex chamber 6, and flows to an outlet 10 provided vertically almost about the center of the bottom surface of the cylinder part 7 of the vortex chamber 6. At this time, a spherical body 11 provided in the vortex flow swivels almost in proportion to the flow velocity of the fluid. Namely, the spherical body 11 swivels in proportion to the flow rate of the fluid from the outlet 9. Further, the spherical body 11 increases in centrifugal force at the time of swiveling and force pressing down the spherical body 11 in proportion to the high-speed swiveling and swivels in contact with the slanting flank part 8b of the nearly conic part 8 of the vortex chamber 6 and the upper edge part 10a of the outlet 10. The rotating speed of the spherical body in the swiveling is detected from a detecting circuit unit ratio and led out as an electric pulse signal to detect the flow rate of the fluid.
|
