Torque-transducer for vortex-shedding flowmeter having torsional

Details Torque-transducer for vortex-shedding flowmeter having torsional Torque-transducer for vortex-shedding flowmeter having torsional

1979-05-10

1981-04-21

Goldstein, Herbert

Measuring and testing

Volume or rate of flow

By measuring vibrations or acoustic energy

310338, 73650, 73DIG4, G01F 132

Patent

active

042625440

ABSTRACT:
A vortex-shedding flowmeter in which a liquid or gas to be metered is conducted through a flow tube having a shedding body transversely supported thereon. Torsionally-supported at a downstream position behind the shedder on a shaft which projects outside of the flow tube to provide a shaft extension is a sensor, the pivot axis of the shaft being normal to the longitudinal axis of the tube. In operation, as the incoming fluid stream is divided by and flows past the shedder, vortices are successively detached therefrom and appear alternately on either side of the sensor, thereby developing a torque about the pivot axis. The torques are developed alternately in the clockwise and counterclockwise directions, causing the torsionally-supported sensor to oscillate at a rate proportional to the flow rate of the fluid. These oscillations are converted by a transducer operatively coupled to the sensor into a corresponding electrical signal. The transducer is constituted by two pairs of piezoelectric elements which engage the shaft extension on opposite sides thereof and are preloaded.

REFERENCES:
patent: 2054787 (1936-09-01), Beavers
patent: 3116639 (1964-01-01), Bird
patent: 3269175 (1966-08-01), Sprosty
patent: 3782184 (1974-01-01), Shuck
patent: 4122712 (1978-10-01), Thomas, Jr.

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