Vibratory transducer

US6666098B2 · kind B2 · utility

Assignee

• Endress+Hauser Flowtec AG · CH

Inventors

• Wolfgang Drahm · Erding, DE
• Alfred Rieder · Landshut, DE
• Ennio Bitto · Aesch, CH
• Rainer Lorenz · Nettetal, DE
• Christian Schutze · Basel, CH
• Alfred Wenger · Neftenbach, CH
• Michael Fuchs · Bad Wörishofen, DE
• Martin Anklin · Aesch, CH

Key dates

• Filing date: May 23, 2002
• Grant date: Dec 23, 2003
• Expiry date: May 23, 2022

Classification

• Technology area (CPC G): Physics
• CPC primary: G01F1/8477
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A vibratory transducer comprises a flow tube for conducting the fluid flowing in a pipe. The flow tube communicates with the pipe via an inlet-side tube section and an outlet-side tube section. An antivibrator is mechanically connected with the flow tube by an inlet-side coupler and an outlet-side coupler. For driving flow tube and antivibrator at an excitation frequency the transducer comprising an excitation system and for sensing inlet-side and outlet-side vibrations of the flow tube the transducer comprising a sensor system. An internal system formed by the flow tube, the antivibrator, the excitation system, and the sensor system, oscillating about a longitudinal axis of the transducer which is essentially in alignment with the inlet-side tube sections, forces a torsion of the couplers about the longitudinal axis and an essentially torsional elastic deformation of the inlet-side and outlet-side tube sections. The couplers are so dimensioned that an inherent torsion eigenmode of the inlet-side coupler and the inlet-side tube section has a natural frequency approximately equal to the excitation frequency, and an inherent torsion eigenmode of the outlet-side coupler and outlet-sid…