# US 4,397,192 A · Vortex flowmeters

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- Number: US 4,397,192 A
- Document ID: US4397192A
- Status: Granted
- Kind: A
- Application number: 06/251,454
- Filed: 1981-04-06
- Granted: 1983-08-09
- Earliest claimed: 1980-04-11
- Assignees: Flonic
- Inventors: Jean-Paul Mollet
- Web page: https://patentgrep.com/patent/US4397192A

## CPC

- G01F 1/3209: {using Karman vortices}
- G01F: MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME

## Abstract

A vortex fluid flowmeter adapted to measure the flowrate of fluid passing through a conduit by measuring the frequency of emission of alternating vortices generated by an obstacle extending across the conduit, comprises a mesh structure mounted upstream of the vortex-shedding obstacle. Said mesh structure is constituted by a grid made of bars of wires of rectangular cross-section. The distance between the grid and the obstacle is so chosen that the obstacle be in the efficient working range of the grid.

## Claims

### Claim 1

A vortex fluid flowmeter comprising: circular conduit means having an internal diameter D; an obstacle disposed within said conduit means transversely thereof for generating vortices in fluid flowing through said conduit means; sensor means responsive to the emission of said fluid; a mesh structure disposed within said conduit means perpendicular to the direction of the fluid on the upstream side of said obstacle wherein said mesh structure is a grid made of bars rectangular in cross-section placed at a distance from said obstacle comprised between about D and 5 D said grid having a ratio of thickness parallel to the fluid flow to the mesh size in the range between about 0.16 and about 0.28.

### Claim 2 (depends on 1)

A vortex fluid flowmeter according to claim 1, wherein said distance is equal to about 1.5D.

### Claim 3 (depends on 1)

A vortex fluid flowmeter according to claim 1, wherein said grid has a mesh size equal to about 0.08D.

### Claim 4 (depends on 1)

A vortex fluid flowmeter according to claim 1, wherein bars of said grid have a dimension transverse to the fluid flow equal to about 0.013D.