Nonvibrating conduit inertia force flowmeter
OwnerHyok S. Lew, Yon S. Lewinventors
Life of this patent
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Abstract
A mass flowmeter comprises a nonvibrating conduit providing a flow passage divided into two parallel and equal subpassages by a planar member with the leading and trailing edges secured to the wall of the flow passage, wherein the planar member is torsionally vibrated about the central axis thereof substantially coinciding with the center line of the flow passage, and a pair of vibration sensors detecting the torsional vibration of the planar member respectively at two different cross sections of the flow passage, wherein the mass flow rate of media moving through the flow passage is determined as a function of a phase angle difference between two alternating electrical signals respectively provided by the pair of vibration sensors.
Claims20
An apparatus for measuring mass flow rate of media comprising in combination:
- a) a body including a flow passage;
- b) a planar member with a leading and trailing edge and two opposite side edges disposed within the flow passage parallel to a center line of the flow passage, wherein at least a leading edge portion of the planar member is secured to the body;
- c) means for generating a torsional vibratory motion of the planar member about a torsion axis generally parallel to the central axis of the flow passage;
- d) means for generating two alternating electrical signals respectively representing the torsional vibratory motion of the planar member at two different cross sections of the flow passage;
- and
- e) means for detecting a difference between the two alternating electrical signals as a measure of mass flow rate of media moving through the flow passage.
An apparatus for measuring mass flow rate of media comprising in combination:
- a) a body including a flow passage;
- b) a planar member with a leading and trailing edge and two opposite side edges disposed within the flow passage parallel to a center line of the flow passage, wherein at least a leading edge portion of the planar member is secured to the body;
- c) at least one electromagnetic vibrator comprising an electric coil wound on a core having an extension extending from a wall of the flow passage towards the planar member and terminated at a close proximity to the planar member, wherein said electromagnetic vibrator exerts a vibratory force onto the planar member and generates a linear flexural vibration of the planar member in directions generally perpendicular to the planar member;
- d) two vibratory motion sensors detecting the linear flexural vibration of the planar member respectively at two different cross sections of the flow passage;
- and
- e) means for detecting a difference between two alternating electrical signals respectively generated by the two vibratory motion sensors as a measure of mass flow rate of media moving through the conduit.
Dependencies are inferred from the claim text.