Karman vortex flow meter
AssigneeFuji Electric Co., Ltd.
InventorsMutsumi Nagumo, Masashi Machida, Michihiko Tsuruoka
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Abstract
A Karman vortex flow meter including an upstream columnar body having a substantially isosceles triangular cross section and a downstream columnar body having a substantially isosceles trapezoidal cross section. The downstream columnar body has a base surface which is substantially equal in width to the base surface of the upstream columnar body. The two bodies are positioned in a stream of a fluid with their base surfaces disposed at a distance from each other in mutually parallel relation and at right angles to the stream for generating Karman vortices to measure the flowing speed or rate of the fluid based on the frequency of the vortices. The upstream columnar body has a pair of rounded edges along its base surface.
Claims6
A Karman vortex flow meter for measuring the flow rate of a fluid by detecting the frequency of Karman vortex streets, said flow meter comprising:
- a pipeline for leading the flow of the fluid therein;
- vortex generating means provided in said pipeline for generating Karman vortices around both sides thereof;
- vortex detecting means for detecting the frequency of the Karman vortices generated around said vortex generating means;
- and
- said vortex generating means comprising an upstream columnar body having a substantially isosceles triangular cross section and a downstream columnar body having a substantially isosceles trapezoidal cross section, said downstream columnar body having a base surface which is substantially equal in width to a base surface of said upstream columnar body, each base surface of said upstream and downstream columnar bodies being spaced apart from the other by a predetermined distance in parallel to the other, said upstream columnar body having a pair of rounded longitudinal edges along the base surface thereof.
A Karman vortex flow meter for measuring the flow rate of a fluid by detecting the frequency of Karman vortex streets, said flow meter comprising:
- a pipeline for leading the flow of the fluid therein;
- vortex generating means provided in said pipeline for generating Karman vortices around both sides thereof;
- vortex detecting means for detecting the frequency of the Karman vortices generated around said vortex generating means;
- and
- said vortex generating means comprising an upstream columnar body having a substantially isosceles triangular cross section and a downstream columnar body, said downstream columnar body having a base surface which is substantially equal in width to a base surface of said upstream columnar body and having a cross-section defined by an arcuately curved surface and its base surface, said curved surface forming an arc of a circle, each base surface of said upstream and downsteam columnar bodies being spaced apart from the other by a predetermined distance in parallel to the other and being at right angles to the stream of the fluid.
Dependencies are inferred from the claim text.