Measuring and testing – Volume or rate of flow – By measuring vibrations or acoustic energy
Patent
1979-12-14
1981-11-03
Goldstein, Herbert
Measuring and testing
Volume or rate of flow
By measuring vibrations or acoustic energy
7386123, G01F 132
Patent
active
042978980
ABSTRACT:
A stabilized vortex-shedding flowmeter for accurately measuring the flow rate of a liquid or gas conducted through a flow tube. The meter includes a front obstacle transversely mounted across the tube with its longitudinal axis normal to the flow axis of the tube. Supported behind the front obstacle and spaced therefrom by a gap is a rear obstacle constituted by a pair of parallel beams symmetrically disposed with respect to the flow axis and lying in a plane normal thereto. In operation, as the incoming fluid stream is divided by and flows past the front obstacle, a stagnant zone is created in the gap. This zone is initially aligned with the flow axis; but as vortices are successively detached from the front obstacle and appear alternately on either side of the gap, the low pressure produced by each vortex act to draw the stagnant zone in front of the beam adjacent thereto, the fluid then going around and past the other beam and imposing a drag force thereon. Since the vortices alternate, the drag forces imposed on the beams alternate at a rate proportional to the flow rate of the fluid. A transducer system is provided to sense the alternating activity in the tube and to generate a signal whose frequency is linearly related to the flow rate.
REFERENCES:
patent: 3116639 (1964-01-01), Bird
patent: 3587312 (1971-06-01), McMurtrie
patent: 3881352 (1975-05-01), McShane
patent: 3940986 (1976-03-01), Yamasaki et al.
patent: 4030355 (1977-06-01), Herzl
patent: 4085614 (1978-04-01), Curran
patent: 4226117 (1980-10-01), Herzl
Ebert Michael
Fischer & Porter Co.
Goldstein Herbert
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