Measuring and testing – Volume or rate of flow – System
Patent
1978-09-21
1980-01-01
Goldstein, Herbert
Measuring and testing
Volume or rate of flow
System
G01F 132
Patent
active
041810201
ABSTRACT:
A vortex-shedding flowmeter in which a shedder is transversely mounted in a flow tube through which the fluid to be metered is conducted, the shedder dividing the flow and causing vortices to be shed alternately on either side thereof at a repetition rate proportional to flow rate, thereby producing downstream trains of vortices moving along the right and left sides of the tube. The wave span between the eyes of successive vortices in the trains has a substantially constant length determined by the geometry of the shedder. At a downstream position in the flow tube is a vane flanked by the trains of vortices and having a length no less than one-half the length of the span and no greater than the full length thereof. The vane is pivoted on a torsion shaft on its central axis which is perpendicular to the tube axis and is balanced with respect thereto. The moving vortices on either side of the vane produce fluidic forces giving rise to alternate clockwise and counterclockwise torques, causing the vane to vibrate at a frequency in accordance with the repetition rate. These vibrations are sensed to provide an output signal indicative of flow rate.
REFERENCES:
patent: 3116639 (1964-01-01), Bird
patent: 4069708 (1978-01-01), Fussell, Jr.
Ebert Michael
Fischer & Porter Co.
Goldstein Herbert
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