Measuring and testing – Volume or rate of flow – By measuring vibrations or acoustic energy
Patent
1987-02-09
1989-02-14
Levy, Stewart J.
Measuring and testing
Volume or rate of flow
By measuring vibrations or acoustic energy
7386124, 73DIG4, G01F 132
Patent
active
048038709
ABSTRACT:
This invention discloses a vortex shedding flowmeter comprising a vortex generator-detector constructed into an integrated assembly wherein the vortex shedding frequencies are detected by a pressure detector including at least one panel of extended surface area, which are pivotably or flexibly confined within a planar cavity included in the bluff body that generates a series of vortices shed from the two sides thereof in an alternating pattern at frequencies substantially proportional to the velocity of the fluid stream wherein the bluff body is immersed. The two opposite planar walls of the planar cavity confining a pressure detector panel respectively include a plurality of small holes open to each of the two sides of the bluff body. The fluctuations in the fluid pressure created by the vortices shed from the two sides of the bluff body in an alternating pattern produce alternating pressure differences across the pressure detector panel and, consequently, creates oscillatory pivoting or flexing motions thereof, which are detected by a transducer connected to the pressure detector panel assembly, that may include a single pressure panel of a large surface area or a plurality of pressure panels disposed in a parallel arrangement and connected to a single transducer.
REFERENCES:
patent: 3564915 (1971-02-01), Tomota et al.
patent: 4470310 (1984-09-01), Tsurooka et al.
patent: 4694702 (1987-09-01), Amemori et al.
Bell Robert P.
Levy Stewart J.
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