US3589185A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vortex type flowmeter
Assignee: Fischer and Porter Co
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Filing: 1969-09-04
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Granted: 1971-06-29
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Expires: 1989-09-04
Abstract
Abstract A flowmeter having no moving parts, and including a conduit forming a passage for the fluid to be measured, and an obstacle assembly mounted therein. The assembly is constituted by a contoured block disposed across the conduit, the longitudinal axis of the block being perpendicular to the flow axis of the conduit, and a strip mounted across the conduit behind the block in parallel relation thereto to define a gap which serves to trap Karman vortices created by the presence of the assembly in the flow path. The vortices are sensed to produce a signal whose periodicity is proportional to flow rate.
Inventors
- 👤 Thomas H Burgess
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 19:37
CPC Classifications
G; G01; G01F; G01F1/00; G01F1/05; G01F1/20; G01F1/32; G01F1/3209; G01F1/3218
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
127 words
A flowmeter of the vortex type, comprising: A. a flow conduit through which fluid to be measured is conducted, B. an obstacle assembly disposed in said conduit, said assembly being constituted by a block mounted across the conduit to divide incoming fluid flow aroUnd and by the assembly, said block being contoured to define leading edges which are swept by the flow to produce a vortex street in the downstream wake of the block having a periodicity which is a function of flow rate, and a strip mounted behind said block in parallel relation thereto to define a gap acting to strengthen and stabilize the vortex street, and C. a sensor disposed in said downstream wake to provide a signal whose frequency is indicative of flow rate.
Claim 2
Dependent Claim
127 words
A flowmeter of the vortex type, comprising: A. a flow conduit through which fluid to be measured is conducted, B. an obstacle assembly disposed in said conduit, said assembly being constituted by a block mounted across the conduit to divide incoming fluid flow aroUnd and by the assembly, said block being contoured to define leading edges which are swept by the flow to produce a vortex street in the downstream wake of the block having a periodicity which is a function of flow rate, and a strip mounted behind said block in parallel relation thereto to define a gap acting to strengthen and stabilize the vortex street, and C. a sensor disposed in said downstream wake to provide a signal whose frequency is indicative of flow rate.
Claim 3
Dependent Claim
16 words
A flowmeter as set forth in claim 1, wherein said conduit has a circular cross section.
Claim 4
Dependent Claim
23 words
A flowmeter as set forth in claim 1, wherein said block has a delta profile, the apex of which faces the incoming fluid.
Claim 5
Dependent Claim
24 words
A flowmeter as set forth in claim 1, wherein said block has a semicircular profile, the curved portion of which faces the incoming fluid.
Claim 6
Dependent Claim
34 words
A flowmeter as set forth in claim 1, wherein the block cross section has a uniform shape but varies in area throughout its length to compensate for the flow profile of the incoming fluid.
References Cited (Backward Citations)
USRE26410E
Cited
US3116639A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-06-28 | 1974-12-28 | 1975-06-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-28 | 1978-12-28 | 1979-06-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-28 | 1982-12-28 | 1983-06-29 | $7700.00 | Window Closed / Lapsed |