| 摘要 |
PROBLEM TO BE SOLVED: To solve problems that the conventional coriolis flowmeter has limitation in accuracy improvement because the conventional coriolis flowmeter vibrates piping letting fluid pass as a spring without modification, and especially, a large error at the flow rate zero and the change of the spring constant of the piping by fluid temperature. SOLUTION: A forced oscillation frame 1 with a square configuration is oscillated with shafts 3, 4 as a center by an electromagnetic driving system 5. A coriolis oscillation frame 7 is arranged in the forced oscillation frame 1 and oscillatably supported with a rotating shaft 8 orthogonal to the shafts 3, 4 as the center. The inlet and outlet 10, 11 of the fluid are arranged very near to a position orthogonally crossing the shafts 3, 4 and the rotating shaft 8, and a first side surface passage 26 and second side surface 27 are arranged symmetrically with the shaft line of the rotating shaft 8 as a center and then the flow in a reverse direction is made with the first side and second side surface passages 26, 27 by concatenating these. Coriolis force in reverse direction is alternately generated in each side surface passage when the forced oscillation frame 1 is oscillated, and a flow rate is measured by detecting displacement thereof. COPYRIGHT: (C)2003,JPO
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