Method and apparatus for measuring fluid flow characteristics

Details Method and apparatus for measuring fluid flow characteristics Method and apparatus for measuring fluid flow characteristics

1996-01-29

1997-04-22

Chilcot, Richard

Measuring and testing

Volume or rate of flow

Mass flow by imparting angular or transverse momentum to the...

G01F 182

Patent

active

056231032

ABSTRACT:
The parameters of flowing fluids are measured via the insertion of a two rotor assembly into the flowing fluid, the rotors adapted to rotate at different free running speeds, and being coupled such that the rotors share a common axis, and such that an angular displacement of one rotor relative to the other rotor applies a restoring torque to the other rotor, the restoring torque being dependent on the amount of angular displacement. The fluid flow induced angular displacement is related to the fluid mass flow rate, and the time interval between the passage of the rotors through a fixed reference plane extending radially from the common axis of the rotors is related to the density of the fluid. The apparatus incorporates rotors that are coupled by connecting them with a plurality of spring elements at two or more positions radially outward from the common axis of the rotors. The rotors may be oriented such that the rotor which is upstream in the flow is adapted to have a slower free running speed. The downstream rotor may be provided with means to move axially in response to the angular displacement induced shortening of the axial extension of the spring elements.

REFERENCES:
patent: 2943487 (1960-07-01), Potter
patent: 3144769 (1964-08-01), Francisco
patent: 3465586 (1969-09-01), Johnston
patent: 3533285 (1970-10-01), Dee
patent: 3575052 (1971-04-01), Lenker

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