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US 2008/0184817 A1Published application
Vibratory transducer
AssigneeEndress + Hauser Flowtec AG
InventorsAlfred Rieder, Wolfgang Drahm
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AssigneeEndress + Hauser Flowtec AG
InventorsAlfred Rieder, Wolfgang Drahm
Estimating the term…
To conduct a fluid, the transducer has a flow tube which in operation is vibrated by an excitation assembly and whose inlet-side and outlet-side vibrations are sensed by means of a sensor arrangement. To produce shear forces in the fluid, the flow tube is at least intermittently excited into torsional vibrations about a longitudinal flow-tube axis. The transducer further comprises a torsional vibration absorber which is fixed to the flow tube and which in operation covibrates with the torsionally vibrating flow tube, thus producing reactive torques which at least partially balance torques developed in the vibrating flow tube. One of the advantages of the transducer disclosed is that it is dynamically balanced to a large extent even in the face of variations in fluid density or viscosity.
Coriolis mass flowmeter with a measuring pipe vibrating in coupled flexural and torsional modes, wherein an attachment which is formed rotationally symmetrically with respect to an axis of rotational symmetry and can be made to undergo torsional oscillations of the same frequency, but opposite phase, in relation to the torsional oscillating modes of the measuring pipe is mechanically connected to the measuring pipe and the axis of rotational symmetry of the attachment runs parallel to the straight line (central axis) defined by the centre points of the cross-sectional areas of the inlet and outlet of the measured section or coincides with this line.
Coriolis mass flowmeter with a measuring pipe vibrating in coupled flexural and torsional modes, wherein at least two attachments which are formed rotationally symmetrically with respect to a common axis of rotational symmetry and can be made to undergo torsional oscillations of the same frequency, but opposite phase, in relation to the torsional oscillating modes of the measuring pipe are mechanically connected to the measuring pipe and the common axis of rotational symmetry of the attachments runs parallel to the straight line (central axis) defined by the centre points of the cross-sectional areas of the inlet and outlet of the measured section or coincides with this line.
Dependencies are inferred from the claim text.