| 摘要 |
A Coriolis mass flowmeter comprising a vibration tube fixed to a housing at an upstream fixed point and a downstream fixed point and an original axis is taken as a straight line connecting these fixed points, wherein the vibration tube is operated so that the tube performs simple harmonic oscillation or circular motion on circumferences at predetermined distances away from each point on the original axis around the original axis take as a center. Since the vibration tube oscillates only in the circumferential planes at equal distances from the original axis, the length of the vibration tube does not vary regardless of the position of the tube. Thus, tensile force in the direction of the axis is always constant and leakage of vibration dued to variations in the force in the direction of the axis is eliminated. The enhanced isolation of vibration makes the vibration inside the flowmeter stable. Accordingly, a highly accurate and stable Coriolis mass flowmeter is achieved by the invention. Since the Q value of the internal vibration becomes high, the flowmeter is not easily affected by the vibration noise, consumes less power, and reduces zero and span changes due to changes in the amount of vibration leakage.
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