Measuring and testing – Volume or rate of flow – By measuring electrical or magnetic properties
Patent
1992-05-29
1994-05-03
Chilcot, Jr., Richard E.
Measuring and testing
Volume or rate of flow
By measuring electrical or magnetic properties
7386108, G01F 158
Patent
active
053076877
ABSTRACT:
An electromagnetic flowmeter for measuring the flow rate of a fluid. The flowmeter has a measuring tube made of ceramics and defining a fluid passage therein for the fluid, electrodes having ends exposed to an interior of the measuring tube through holes which are formed in a wall of the measuring tube, a magnetic field generating device disposed around the electrodes, and a case encasing the measuring tube, the electrodes and the magnetic field generating means. A ratio t/R between a wall thickness t and a mean radius R of the measuring tube is determined such that stress generated in the measuring tube by the fluid in the measuring tube does not exceed the rupture stress of the measuring tube. The measuring tube can have flanges on both axial ends thereof, a radial height of the flange from an outer surface of the measuring tube is not greater than the wall thickness of the tube when the tube is made of Al.sub.2 O.sub.3 and not greater than a value three times as large as the tube wall thickness when the tube is made of Si.sub.3 N.sub.4. The electrodes may be made from Ni or an Ni alloy and are secured to the measuring tube by press-fitting into holes formed in the tube wall or by jointing. The electromagnetic flowmeter thus obtained exhibits high strength and reliability and high degree of gas-tightness in the tube portions around the electrodes.
REFERENCES:
patent: 4507975 (1985-04-01), Bittner et al.
patent: 4722231 (1988-02-01), Tanaka et al.
patent: 4912838 (1990-04-01), Goto et al.
Arai Masatsugu
Ishihara Tamio
Kohno Akiomi
Sakurai Yutaka
Yokoi Kazuaki
Chilcot Jr. Richard E.
Dougherty Elizabeth L.
Hitachi , Ltd.
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