| 摘要 |
PROBLEM TO BE SOLVED: To provide a fluid vibration-type flowmeter whose measuring range is wide and whose measuring accuracy is superior by optimizing the shape of a downstream-side flow passage in terms of its dimension. SOLUTION: The radius of an expanded flow passage 221 is designated as R. The radius of a second reduced flow passage 223 is designated as R2. The width of a discharge port part 224 is designated as Wo. The dimension which is extended to the downstream side along the center line C from the exit of a nozzle flow passage 210 and which reaches an end-point position in the width of Wo is designated as Xt. The dimension which is extended to the downstream side along the center line C from the end part on the upstream side of the discharge port part 224 and which reaches the end-point position in the width of Wo is designated asΔX. The dimension in the thickness direction is designated as H. In this case, a fluid vibration-type flowmeter is featured so as to have relationships of HER = 0.3486 to 0.7283, R2/R = 0.3415 to 0.3732, Wo/R + 1.3239 to 1.3913, Xt/R = 2.4507 to 4.1522, andΔX/R = 0.2007 to 1.8261.
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