Straight tube type Coriolis flowmeter which has an elastic connection member and the base and the flow tube tertiary mode node positions stabilizing structure

摘要

PROBLEM TO BE SOLVED: To stabilize the node position in tertiary mode of stress dispersion and a flow tube.;SOLUTION: The straight-tube Coriolis flowmeter 21 includes a straight-tube flow tube 3, a driving device 7 for driving it with tertiary mode vibration, a pair of detecting means 8 for detecting a phase difference proportional to the Coriolis force, a rigid pedestal 22, an elastic connecting member 23 with elasticity, and a bracket 24 for weight addition. Assuming that the axial direction of the flow tube 3 is Z axis, the driving direction of the driving device 7 is X axis, and the direction orthogonal to the Z axis and X axis is Y axis, the elastic connecting member 23 is an elastic body where the rigidity of the Z-axis direction is lower than the rigidities of the X-axis direction and Y-axis direction, or an elastic body where the rigidity of the rotation direction about Y axis is lower than the rigidities of the rotation direction about Z axis and the rotation direction about X axis. The bracket 24 for weight addition is a member for link and weight addition, and is effective for stabilizing the node position.;COPYRIGHT: (C)2007,JPO&INPIT