US 2002/0152819 A1 · Vibratory transducer

Abstract

To conduct a fluid, the transducer has a flow tube which in use is vibrated by an excitation system and whose inlet-side and outlet-side vibrations are detected by means of a sensor system. In response to transverse forces produced in the vibrating flow tube, the latter is, at least temporarily, laterally displaced from an assigned static rest position. To improve the dynamic balance of the transducer, a first cantilever and a second cantilever are rigidly fixed to an inlet-side tube section and an outlet-side tube section, respectively. By means of the cantilevers, the inlet-side and outlet-side tube sections are deformed as a result of lateral displacements of the flow tube. This produces counterforces which at least partially counterbalance the transverse forces produced in the vibrating flow tube. One advantage of the proposed transducer is that it is well balanced even during variations in fluid density.

Claims14

Dependent claims

A vibratory transducer for a fluid flowing in a pipe, said transducer comprising:

a flow tube vibrating in operation, for conducting the fluid, said flow tube communicating with the pipe via an inlet-side tube section and an outlet-side tube section, and said vibrating flow tube being, at least temporarily, laterally displaced from an assigned static rest position as a result of transverse impulses occurring in the transducer;
an excitation system for driving the flow tube;
a sensor system for sensing vibrations of the flow tube;
a first cantilever, fixed to the inlet-side tube section, for causing bending moments that elastically deform the inlet-side tube section;
and
a second cantilever, fixed to the outlet-side tube section, for causing bending moments that elastically deform the outlet-side tube section,
said bending moments being such that in the deforming inlet-side tube section and in the deforming outlet-side tube section, impulses are produced which are directed opposite to the transverse impulses produced in the vibrating flow tube.

4 more elements

A vibratory transducer for a fluid flowing in a pipe, said transducer comprising:

a flow tube vibrating operation, for conducting the fluid, said flow tube communicating with the pipe via an inlet-side tube section and an outlet-side tube section, and said vibrating flow tube being, at least temporarily, laterally displaced from an assigned rest position as a result of transverse forces produced in the flow tube;
an excitation system for driving the flow tube;
a sensor system for sensing vibrations of the flow tube;
a first cantilever for causing bending moments that elastically deform the inlet-side tube section, said first cantilever having a cantilever arm rigidly fixed to the inlet-side tube section and a cantilever mass formed thereon;
and
a second cantilever for causing bending moments that elastically deform the
outlet-side tube section, said second cantilever having a cantilever arm rigidly fixed to the outlet-side tube section and a cantilever mass formed thereon,
wherein both the cantilever mass of the first cantilever and the cantilever mass of the second cantilever being spaced from the flow tube, from the inlet-side tube section, and from the outlet-side tube section, and the cantilever arm and cantilever mass of the first cantilever and the cantilever arm and cantilever mass of the second cantilever being so adapted to one another that a centroid of the first cantilever, located in the area of the inlet-side tube section, and a centroid of the second cantilever, located in the area of the outlet-side tube section, remain essentially in a static rest position although the flow tube is laterally displaced from its assigned static rest position.

5 more elements

Dependencies are inferred from the claim text.

Vibratory transducer

Life of this patent

Vibratory transducer

Life of this patent

Abstract

Claims14