Fluid flow rate measuring and controlling apparatus and method f

Details Fluid flow rate measuring and controlling apparatus and method f Fluid flow rate measuring and controlling apparatus and method f

1995-01-17

1996-06-18

Chilcot, Richard

Measuring and testing

Volume or rate of flow

Expansible chamber

73279, G01F 320

Patent

active

055266851

ABSTRACT:
A volumetric flow control apparatus and method for measuring and controlling the volumetric flow rate and flow volume of a fluid. The apparatus comprises a reciprocating diaphragm meter having a diaphragm mounted for reciprocating movement and a diaphragm position indicator assembly for monitoring the position of the diaphragm as it reciprocates. As a fluid under pressure passes through the reciprocating diaphragm meter the diaphragm reciprocates through at least one meter cycle during which the meter passes a fixed volume of fluid per meter cycle. A timer responsive to the diaphragm position indicator is provided to measure the elapsed time for the meter diaphragm to reciprocate through at least one meter cycle. A processor calculates the volume flow rate of the fluid passing through the reciprocating diaphragm meter by dividing the fixed volume of fluid passed by the meter in a meter cycle by the elapsed time measured during the meter cycle. The volume flow rate of fluid passing through the reciprocating diaphragm meter is controlled by a controller which compares the measured flow rate to a desired flow rate and then causes the pressure differential across the reciprocating diaphragm meter to be changed to increase or decrease the fluid flow rate.

REFERENCES:
patent: 2619940 (1952-12-01), Leroy
patent: 2742785 (1956-04-01), St. Clair
patent: 3415121 (1968-12-01), Douglas
patent: 5027661 (1991-07-01), Desaulniers et al.
patent: 5056036 (1991-10-01), Van Bork
patent: 5109711 (1992-05-01), Wendt

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