Apparatus for ultrasonically measuring the flow rate of a fluid in a measuring channel, achieving an attenuation of the parasitic signals

Patent metadata

Field	Value
Publication number	US-10584991-B2
Application number	US-201815950029-A
Country	US
Kind code	B2
Filing date	Apr 10, 2018
Priority date	Apr 10, 2017
Publication date	Mar 10, 2020
Grant date	Mar 10, 2020

Abstract

An apparatus for ultrasonically measuring the flow rate of a fluid in a measuring channel including fluid supply passages at its ends, this measuring channel forming a waveguide made into a solid body, comprising at each end a transducer capable of emitting or receiving ultrasounds circulating in the axis of the channel, where each transducer includes a shell transmitting the ultrasounds, comprising a waveguide facing the measuring channel, and outside this waveguide shapes orientating the ultrasounds in directions different from that of the channel.

First claim

The invention claimed is:

1. An apparatus for ultrasonically measuring the flow rate of a fluid in a measuring channel including fluid supply passages at its ends, this measuring channel forming a waveguide made into a solid body, comprising at each end a transducer capable of emitting or receiving ultrasounds circulating in the axis of the channel, wherein each transducer includes a shell transmitting the ultrasounds, comprising a waveguide facing the measuring channel, and outside this waveguide shapes orientating the ultrasounds in directions different from that of the channel.

2. The measuring apparatus according to claim 1 , wherein the shapes sending the ultrasounds in a different direction include a revolution shape centered on the axis of the channel, which bears on the solid body.

3. The measuring apparatus according to claim 1 , wherein each transducer shell includes a contour which is fitted into a cavity formed at the rear of the measuring channel.

4. The measuring apparatus according to claim 3 , wherein each waveguide includes a front transverse face which is disposed just at the rear of a fluid supply passage.

5. The measuring apparatus according to claim 2 , wherein each transducer shell includes, starting from the rear, a straight cylindrical portion, the revolution shape which narrows the diameter, then the waveguide forming a straight cylindrical portion filling the end of the measuring channel.

6. The measuring apparatus according to claim 1 , wherein the revolution shape constitutes a cone presenting an opening angle comprised between 60 and 120°.

7. The measuring apparatus according to claim 1 , further comprising a rear axial tightening system of the transducer shell.

8. The measuring apparatus according to claim 7 , wherein the axial tightening system includes a nut engaged on a thread of the body of the apparatus, disposed along the axis of the measuring channel.

9. The measuring apparatus according to claim 1 , wherein the body of the apparatus includes between the two fluid supply passages at least one transverse crack which splits this body into two distinct axial portions.

10. The measuring apparatus according to claim 9 , wherein the at least one crack includes an air layer, or a layer of materials with an acoustic impedance different from that of the body, which is interposed between the two axial portions of the body.

11. The measuring apparatus according to claim 1 , wherein the body of the apparatus includes two perforations forming the fluid supply passages, opening at the ends of the measuring channel, which form with this channel an angle comprised between 120 and 150°.

Assignees

• Efs Sa
• Lyon Ecole Centrale
• Centre Nat Rech Scient
• Univ Claude Bernard Lyon
• Inst Nat Sciences Appliquees Lyon

Inventors

• Robin Julian
• Gucher Pascal
• Huchon Alexandre
• Ollivier Sébastien
• Blanc-Benon Philippe

Classifications

• G01F1/662 Primary

  Constructional details · CPC title

• G01F1/667

  Arrangements of transducers for ultrasonic flowmeters; Circuits for operating ultrasonic flowmeters · CPC title