Karman vortex flow meter
AssigneeFuji Electric Co., Ltd.
InventorsMichihiko Tsuruoka, Wataru Nakagawa, Osamu Kashimura, Naohiro Kounosu, Hiromi Suzawa
Life of this patent
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Abstract
A Karman vortex flow meter for measuring the flow rate of a fluid under test in a pipeline having a base to be secured to the pipeline, and a vortex detector having an axis intended to intersect the pipeline. The vortex detector includes a post, a detector flange at least partially surrounding the post having a free surface, a columnar force receiving part extending from the post into the pipeline for producing a Karman vortex, and a strain detecting element coupled to the free surface for detecting the Karman vortex and producing an output signal corresponding the detected Karman vortex.
Claims12
A Karman vortex flow meter for measuring the flow rate of a fluid under test, in a pipeline containing the fluid and having a longitudinal axis along which the fluid flows, comprising:
- a vortex detector having a detector axis generally perpendicular to the longitudinal axis of the pipeline, said vortex detector including:
- a post aligned with said detector axis;
- a detector flange substantially coaxial with and at least partially surrounding said post, said detector flange having a flexible surface orthogonal to the post;
- a columnar force receiving part axially aligned with the post and extending from the bottom of said post into the pipeline, said receiving part shaped for producing a Karman vortex when inserted into the pipeline, wherein the Karman vortex applies a force to the force receiving part;
- a balance weight aligned with and at least partially surrounding said post, said balance weight movable along the axis of said post;
- and
- a strain detecting element pushed against and secured to said detector flange by a disk spring interposed between said balance weight and said strain detecting element.
Dependencies are inferred from the claim text.