Pressure fluctuation flowmeter

Measuring and testing – Volume or rate of flow – System

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G01F 132

Patent

active

041618785

ABSTRACT:
A fluid flowmeter includes a bluff body for producing vortex shedding free of intermittency. The body has at one end a support member for mounting in a conduit and has proximate its downstream surfaces a pair of orifices. A vibratory planar sensor, preferably ferromagnetic, is situated in a sensor chamber within the support member for vibrating in response to received pressure fluctuations. A magnetic detector is situated in proximity to the sensor for producing an electrical signal when the sensor vibrates in response to vortex shedding. Fluid in the conduit, and thus vortex shedding, is coupled from the orifices through a pair of parallel channels, which are in non-fluid-flow communication with one another, to opposite sides of the sensor. In one embodiment, the sensor comprises a diaphragm rigidly mounted along its periphery whereas in another embodiment the sensor comprises a rigid, substantially planar disc vibratorily mounted along its periphery.

REFERENCES:
patent: 1560664 (1925-11-01), Cole
patent: 3382715 (1968-05-01), Larham et al.
patent: 3564915 (1971-02-01), Tomota et al.
patent: 3698245 (1972-10-01), McNabb
patent: 3722273 (1973-03-01), Yamasaki
patent: 3823610 (1974-07-01), Fussell, Jr.
patent: 3972232 (1976-08-01), Miller
patent: 4085614 (1978-04-01), Curran et al.

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