Flow sensors

Details Flow sensors Flow sensors

1985-06-27

1987-03-17

Goldstein, Herbert

Measuring and testing

Volume or rate of flow

Using turbine

7386189, G01F 112

Patent

active

046497560

ABSTRACT:
The disclosed apparatus for sensing the flow of liquid along a passage includes a turbine-type rotor formed of high-resistivity insulation and supported coaxially in the passage. The rotor has spiral vanes distributed about a core. A stator upstream of the rotor provides a spiralling flow pattern in the zone of the rotor. The stator has vanes that spiral in the same direction as the rotor's vanes but at a lower pitch. An electrical sensor provides a varying signal representing the rotation of the rotor. The output signal waves are accurately proportional to the flow over an unusually wide range of flow rates. The electrical sensor includes electrodes exposed to the flow passage, a sensing electrode that is wider than the thickness of a rotor vane and a metal pipe that serves as a companion electrode. Successive pairs of rotor vanes span the sensing electrode at intervals as the rotor turns, periodically acting as barriers that reduce conduction through the liquid in the passage.

REFERENCES:
patent: 3203242 (1965-08-01), Souriau
patent: 3240063 (1966-03-01), Bruechner
patent: 3370465 (1968-02-01), Belle
patent: 3559483 (1971-02-01), Freud
patent: 3822591 (1974-07-01), Li
patent: 3972233 (1976-08-01), Pelt et al.
patent: 4324145 (1982-04-01), Werkmann
patent: 4333354 (1982-06-01), Feller

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