Measuring and testing – Volume or rate of flow – By measuring vibrations or acoustic energy
Patent
1987-04-17
1988-09-27
Goldstein, Herbert
Measuring and testing
Volume or rate of flow
By measuring vibrations or acoustic energy
73658, G01F 132
Patent
active
047732733
ABSTRACT:
A Karman vortex flowmeter has a column inserted in the fluid passage to produce a Karman vortex street corresponding to the velocity of a fluid and for measuring the flow rate of the fluid by making use of the variations in the pressure caused by the production of the Karman vortex street. A metal sheet member consists of a magnetic substance and includes a vibrating plate portion that is divided into two portions. Pressure transfer means in the column transmit the variations in the pressure to the vibrating plate portion for causing vibration at a rate related to the fluid flow rate. Two magnets are disposed to magnetize the two portions of the vibrating plate portion to different polarities, according to the direction of the vibration of the vibrating plate portion as caused by the variations in the pressure and a detecting means detects the inversion of the direction of the magnetic flux in the magnetic circuit formed by magnetization of the metal sheet member to find the flow rate of the fluid, the inversion being caused by the inversion of the direction of vibration of the vibrating plate portion.
REFERENCES:
patent: 1935445 (1933-11-01), Heinz
patent: 3116639 (1964-01-01), Bird
patent: 4470310 (1984-09-01), Tsuruoka
Kurihara Norimitsu
Tanaka Akira
Goldstein Herbert
Honda Giken Kogyo Kabushiki Kaisha
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