Coriolis flowmeter

A Coriolis flowmeter for obtaining at least one of a mass flow rate and a density of a measurement fluid through detection of at least one of a phase difference and a vibration frequency proportional to the Coriolis forces acting on a pair of first and second curved tube portions constituting a measurement flow tube by vibrating the first and second curved tube portions while being opposed to each other, comprising:

• a first inlet portion through which the measurement fluid flows in and a first outlet portion through which the measurement fluid flows out, in the first curved tube portion;
• and
• a second inlet portion through which the measurement fluid flows in and a second outlet portion through which the measurement fluid flows out, in the second curved tube portion, the Coriolis flowmeter being characterized in that:
• a fixing member is provided so as to be situated in a middle position of the flow tube as seen in plan view;
• the first inlet portion, the second inlet portion, the first outlet portion, and the second outlet portion are fixed to the fixing member;
• a connecting tube portion is provided between the first outlet portion and the second inlet portion, for connecting the two portions;
• in the fixation to the fixing member, the first inlet portion and the second inlet portion are arranged in a non-parallel state such that a distance therebetween increases as they depart from the fixing member, the first outlet portion and the second outlet portion are arranged in a non-parallel state such that a distance therebetween increases as they depart from the fixing member, and the first inlet portion and the second inlet portion, and the first outlet portion and the second outlet portion are arranged symmetrically;
• and
• the first outlet portion, the second inlet portion, and the connecting tube portion are arranged such that tube axes of the three portions are in a straight line.