Dual output vortex-shedding flowmeter having drag-actuated torsi

Measuring and testing – Volume or rate of flow – By measuring vibrations or acoustic energy

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G01F 132

Patent

active

043076190

ABSTRACT:
A dual output vortex-shedding flowmeter in which a liquid or gas to be metered is conducted through a flow tube having a shedding body transversely supported thereon, the flowmeter being usable in a custody transfer system requiring two independent output signals. Torsionally-supported behind the body and spaced therefrom by a gap is a drag-actuated sensor which includes a pair of parallel legs symmetrically disposed with respect to a spindle forming the fulcrum axis of the sensor, this axis being normal to the longitudinal axis of the tube. In operation, torques are developed alternately in the clockwise and counterclockwise directions, causing the torsionally-supported sensor to oscillate at a frequency proportional to the flow rate of the fluid. These oscillations are converted into corresponding electrical signals by a pair of transducers coupled to opposing ends of the spindle to provide two independent outputs.

REFERENCES:
patent: 3116639 (1964-01-01), Bird
patent: 3720104 (1973-03-01), Zanker
patent: 3888120 (1975-06-01), Burgess
patent: 4226117 (1980-10-01), Herzl

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