US4397192A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vortex flowmeters
Assignee: Flonic SA
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Filing: 1981-04-06
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Granted: 1983-08-09
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Expires: 2001-04-06
Abstract
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.
Inventors
- 👤 Jean-Paul Mollet
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 13:20
CPC Classifications
G; G01; G01F; G01F1/00; G01F1/05; G01F1/20; G01F1/32; G01F1/3209
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
115 words
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
Dependent Claim
115 words
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 3
Dependent Claim
16 words
A vortex fluid flowmeter according to claim 1, wherein said distance is equal to about 1.5D.
Claim 4
Dependent Claim
19 words
A vortex fluid flowmeter according to claim 1, wherein said grid has a mesh size equal to about 0.08D.
Claim 5
Dependent Claim
25 words
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.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-08-08 | 1987-02-07 | 1987-08-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-08-08 | 1991-02-07 | 1991-08-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-08-08 | 1995-02-07 | 1995-08-09 | $7700.00 | Window Closed / Lapsed |