Coriolis flowmeter having a cross-sectional area of channels of the manifolds enabling a reduction in pressure loss

摘要

Provided is a Coriolis flowmeter capable of achieving suppression of a pressure loss of a manifold and the like. A channel (15) of a manifold (8) includes a pipe-side opening portion (16), tube-side opening portions (17), and a channel branching portion (18) as shaping portions therefor, and the channel sectional area in a range of from the channel branching portion (18) toward the tube-side opening portions (17) is linearly decreased. A branching wall tip end (20) of a branching wall (19) extending from a position of the channel branching portion (18) to the other end of a manifold body (12) is arranged at the channel branching portion (18). The sectional shape of the channel (15) is a circular shape at a position of the pipe-side opening portion (16), and is changed to D-shapes at the position of the channel branching portion (18) by the branching wall tip end (20).

主权项

1. A Coriolis flowmeter configured to drive flow tubes and detect a phase difference and/or a vibration frequency proportional to a Coriolis force acting on each of the flow tubes, to thereby determine a mass flow rate and/or density of a fluid to be measured, which flows through the each of the flow tubes,
the Coriolis flowmeter comprising manifolds arranged at both end portions of the each of the flow tubes, wherein a number of the flow tubes is set to two, wherein a channel of each of the manifolds comprises, as shaping portions therefor:
a pipe-side opening portion arranged close to a pipe to which the Coriolis flowmeter is to be installed;tube-side opening portions arranged close to the flow tubes, a number of the tube-side opening portions being equal to the two flow tubes; anda channel branching portion to be branched corresponding to the two flow tubes, wherein areas of branching portion sectional shapes of the channel branching portion are set equal to each other, wherein a channel sectional area in a range of from the channel branching portion toward the tube-side opening portions is set so as to be prevented from becoming larger than the areas of the branching portion sectional shapes, wherein each of the branching portion sectional shapes of the channel branching portion has a D-shape, and a shape of each of the tube-side opening portions has a circular shape, and wherein the channel sectional area in the range of from the channel branching portion toward the tube-side opening portions linearly decreases from the areas of the branching portion sectional shapes.