Vortex flow meter apparatus

Measuring and testing – Volume or rate of flow – System

Patent

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Details

G01F 132

Patent

active

039722325

ABSTRACT:
A vortex-shedding flow-sensing instrument comprising a flat-faced vortex-generating plate integral with a downstream sensor-bar having flat sides set back laterally with respect to the rows of vortices shed from the edges of the vortex-generating plate. The side surfaces of the plate are tapered inwardly at a moderate angle, and extend down a short distance to rear surfaces at right angles with respect to the direction of fluid flow. The downstream end of the sensor bar comprises a tail piece the side surfaces of which are tapered inwardly at a moderate angle, and extend downstream a short distance to a rear surface perpendicular to the direction of fluid flow.
The sensor bar carries on oil-filled capsule having as side walls a pair of flexible diaphragms effectively in the plane of the sensor-bar side surfaces. These diaphragms transmit alternating vortex pressure pulses interiorly of the capsule to a sensing element in the form of a ceramic disc having piezo-electric properties. The resulting alternating voltage signal developed by this element is coupled through lead wires to an amplifier arranged to produce a flow signal suitable for transmission over relatively long distances.

REFERENCES:
patent: 3116639 (1964-01-01), Bird
patent: 3572117 (1971-03-01), Rodley
patent: 3732731 (1973-05-01), Fussell, Jr.
patent: 3796095 (1974-03-01), Fussell, Jr.
patent: 3810388 (1974-05-01), Cousins et al.

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