Measuring and testing – Volume or rate of flow – Expansible chamber
Patent
1992-11-19
1994-01-04
Goldstein, Herbert
Measuring and testing
Volume or rate of flow
Expansible chamber
418191, G01F 310
Patent
active
052750434
ABSTRACT:
A positive displacement flowmeter is provided having a body structure defining a flowmeter measurement chamber within which is rotatably supported a large primary gear rotor and a small secondary gear rotor that have rotor teeth intermeshing with one another and also establishing a limited dynamic flow path with respect to internal wall surface segments of the flowmeter measurement chamber. The flowmeter body defines inlet and outlet passages defining a common center-line that is off-center with respect to the flowmeter chamber and which is located between the axis of rotation of the primary rotor and the limited dynamic flow path that is defined within the housing. The essence of this flowmeter construction rests with the rugged, machined gear pair rotating against a limited dynamic seal path coupled with introducing the fluid stream at an off-center position in relation to the flowmeter body and rotor system. These features result in a flowmeter having extremely efficient dynamic responses to changes in flow rate thus permitting the flowmeter construction to take advantage of the fluid stream dynamic pressures. The body structure, particularly at least one end wall thereof, is provided with aligned elongate grooves which provide the flowmeter construction with hydraulic relief which eliminates hydraulic shock that might otherwise cause pressure loss. Electronic signal output of the flowmeter is provided by a radio frequency sensor which detects movement of metallic markers of the primary rotor hub past a detection point during flowmeter operation.
REFERENCES:
patent: 3368403 (1968-02-01), Granberg
patent: 3981194 (1976-09-01), Blise et al.
Goldstein Herbert
Jackson James L.
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