Measuring and testing – Volume or rate of flow – Expansible chamber
Patent
1997-11-15
1999-11-30
Chilcot, Richard
Measuring and testing
Volume or rate of flow
Expansible chamber
4182065, G01F 304
Patent
active
059922303
ABSTRACT:
A positive displacement flow meter includes a pair of smooth oval shaped rotors mounted to a pair of spaced apart rotatable shafts contained within a sealed housing. The rotatable shafts penetrate the measuring chamber and have a pair of toothed, oval shaped timing gears located in a separate gear cavity chamber which are responsible for synchronizing and maintaining the relative orientation of the smooth faced rotors with respect to one another. The fluid that is being metered forms seals between the rotating surfaces of the rotors, as well as between the rotors and the wall of rotor chamber, thus the inlet and outlet plenums are physically isolated and are consequently not in direct communication at any point during the rotation cycle of the rotors. Thus, each rotation of the rotors results in the transport of a precise and known volume of fluid from the inlet plenum to the outlet plenum. A magnetic sensing/counting system, which includes an magnetic actuator attached to one of the rotor shafts and a magnetic sensor mounted to the flow meter housing, monitors the rotation rate of the rotors and hence the flow rate of the fluid passing through the meter.
REFERENCES:
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patent: 5559288 (1996-09-01), Schumacher
Hayman Robert
Hoffer Kenneth R.
Scarpa, deceased Thomas J.
Chilcot Richard
Hoffer Flow Controls, Inc.
Thompson Jewel V.
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