| 摘要 |
PROBLEM TO BE SOLVED: To provide a vortex flowmeter with improved vibration resistance. SOLUTION: The vortex flowmeter provided with a case attached to a conduit body and measuring a flow velocity and a flow rate by detecting fluctuations of an alternating pressure by a Karman vortex, using a stress detection element disposed in a vortex generator, includes a three-axis gyro disposed in the case and detecting case vibration noise in X-, Y-, and Z-axis directions respectively; a vibration control circuit outputting anti-phase vibration signals of these gyro-detected vibration signals based on the vibration signals detected by this three-axis gyro; piezoelectric actuators having one surface thereof disposed on the case of the three-axis gyro, orthogonal to the X-, Y-, and Z-axis respectively, and generating vibrations negating the gyro-detected vibration signals based on signals from the vibration control circuit; and a vibration detection generation unit provided with additional masses having one surface thereof disposed on the other surface of these piezoelectric actuator respectively. COPYRIGHT: (C)2011,JPO&INPIT |
