Measuring and testing – Volume or rate of flow – By measuring vibrations or acoustic energy
Patent
1991-08-26
1993-06-22
Goldstein, Herbert
Measuring and testing
Volume or rate of flow
By measuring vibrations or acoustic energy
G01F 132
Patent
active
052208427
ABSTRACT:
A vortex flowmeter comprises a vortex generating bluff body of an elongated cylindrical shape disposed across a cross section of the flow passage, which bluff body has a planar extension extending from one extremity thereof and into a planar cavity included in the flowmeter body, wherein the combination of the bluff body and the planar extension thereof is supported at a midsection of the combination in an arrangement allowing at least a minute amount of pivotal movement about a pivot axis disposed parallel to the direction of the fluid flow and passing through the midsection of the combination of the bluff body and the planar extension thereof, and a plurality of pressure communicating holes disposed through the bluff body and the planar extension thereof expose one side face of the planar extension to the fluid pressure existing at the other side face of the bluff body opposite to said one side face, and the other side face of the planar extension to the fluid pressure existing at one side face of the bluff body, which arrangement produces an alternating torque about the pivot axis generated by the vortex shedding from the bluff body and experienced by the combination of the bluff body and the planar extension thereof, and generates an alternating electrical signal representing the vortex shedding from at least one transducer connected to one extremity of the combination of the bluff body and the planar extension thereof.
REFERENCES:
patent: 1935445 (1933-11-01), Heinz
patent: 4083240 (1978-04-01), Herzl
patent: 4181020 (1980-01-01), Herzl
patent: 4526040 (1985-07-01), Matsubara
patent: 4679445 (1987-07-01), Knudsen et al.
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