Vibratory transducer
First Claim
1. A vibratory transducer for a fluid flowing in a pipe, the transducer comprising:
- an essentially straight flow tube communicating with the pipe for conducting the fluid, said flow tube being connected to the pipe via an inlet tube section and via an outlet tube section, and said flow tube being operable to vibrate;
an antivibrator fixed to said flow tube, said antivibrator extending essentially parallel to said flow tube and said antivibrator being connected to said flow tube to be essentially coaxial with said flow tube;
an excitation assembly acting on said flow tube for vibrating said flow tube, said excitation assembly being adapted to excite said flow tube into torsional vibrations about its longitudinal axis, and to excite said flow tube into flexural vibrations; and
a sensor arrangement for sensing vibrations of said flow tube.
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Accused Products
Abstract
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.
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Citations
22 Claims
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1. A vibratory transducer for a fluid flowing in a pipe, the transducer comprising:
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an essentially straight flow tube communicating with the pipe for conducting the fluid, said flow tube being connected to the pipe via an inlet tube section and via an outlet tube section, and said flow tube being operable to vibrate; an antivibrator fixed to said flow tube, said antivibrator extending essentially parallel to said flow tube and said antivibrator being connected to said flow tube to be essentially coaxial with said flow tube; an excitation assembly acting on said flow tube for vibrating said flow tube, said excitation assembly being adapted to excite said flow tube into torsional vibrations about its longitudinal axis, and to excite said flow tube into flexural vibrations; and a sensor arrangement for sensing vibrations of said flow tube. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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Specification