Variable area obstruction gas flow meter

Details Variable area obstruction gas flow meter Variable area obstruction gas flow meter

1990-08-20

1991-08-13

Goldstein, Herbert

Measuring and testing

Volume or rate of flow

Using differential pressure

128725, G01F 122, G01F 136

Patent

active

050386212

ABSTRACT:
A flow meter including a variable area obstruction which is mounted in a conduit. Inputs to a differential pressure transducer are positioned in the conduit on opposite sides of the obstruction to measure fluid pressure differential across the obstruction. In one embodiment, a sleeve is secured within the conduit thereof substantially separated from the conduit so as to prevent fluid condensation on the sleeve, and to create a dead end pocket between the conduit and the sleeve for collecting liquids from the conduit end preventing them from contacting the obstruction. The variable area obstruction comprises an elastic membrane that includes first, second and third leaves which extend into the flow stream and are compliant to fluid flow so that an increase in flow rate increases the deflection of the leaves and increases the through flow area through the obstruction. The first leaf is secured at a fixed end adjacent a first portion of the interior surface of the conduit and extends in a first direction to a free end preferably positioned adjacent a second portion of the interior surface of the conduit opposite the first portion. The second and third leaves are located adjacent opposite sides of the first leaf and extend from their fixed ends toward their free ends in directions which are generally opposite to the first direction.

REFERENCES:
patent: 2941544 (1960-06-01), Peras
patent: 2989866 (1961-06-01), Widell et al.
patent: 3232288 (1966-02-01), Krobath
patent: 3989037 (1976-11-01), Franetki
patent: 4006634 (1977-02-01), Billete et al.
patent: 4083245 (1978-04-01), Osborn
patent: 4163390 (1979-08-01), Rodder
patent: 4448064 (1984-05-01), Asayama
patent: 4599907 (1986-07-01), Kraus et al.
patent: 4688433 (1987-08-01), Silverwater

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