Measuring and testing – Volume or rate of flow – Thermal type
Patent
1974-05-17
1976-06-22
Queisser, Richard C.
Measuring and testing
Volume or rate of flow
Thermal type
73209, G01F 122
Patent
active
039643107
ABSTRACT:
A fluid flow meter of the variable area flow passage type is provided wherein the variation in said flow passage area is effected by the displacement of a control boundary which is supported by an annular diaphragm element. Said control boundary is shaped and sized so that the overall displacement required for the flow rate range desired is within the stroke capacity delivered by the free flexing action of said diaphragm element, thereby achieving substantially constant differential pressure operation at a very reasonable value which is due almost entirely to gravity. The resulting unit is very compact and stable and is characterized by very smooth linear response between vertical displacement and fluid flow rate. Said vertical displacement can be measured by various means but is preferably transduced to an equally linear, smooth and steady electrical signal by a direct connection with a specially adapted differential transformer.
REFERENCES:
patent: 1416220 (1922-05-01), Long et al.
patent: 2634747 (1953-04-01), Markson
patent: 2955465 (1960-10-01), Delaney
patent: 3218853 (1965-11-01), Ongaro
Beauchamp John P.
Brennan Bryant W.
Collins Arthur S.
Dart Industries Inc.
Queisser Richard C.
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