US4372169A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vortex generating mass flowmeter
Assignee: VORTECH SCIENCES Inc A CORP OF DE
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Filing: 1980-01-07
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Granted: 1983-02-08
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Expires: 2000-01-07
Abstract
Abstract Drag is produced in a gas stream by a bluff body (47), and is converted to low pressure stable and continuous vortices by a restriction (56). The difference in gas pressure is sensed (14) between a point (15) outside the flow passage in communication therewith and a point (16) inside the flow passage between the restriction and the bluff body. The resultant flowmeter may be connected in line or as a bypass in a gas system.
Inventors
- 👤 Nathaniel Hughes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 20:57
CPC Classifications
B; B05; B05B; B05B17/00; B05B17/04; B05B17/06; B05B17/0692; F; F23; F23D; F23D11/00; F23D11/34; G; G01; G01F; G01F1/00; G01F1/05; G01F1/20; G01F1/32; G01F1/3209; G01F1/34; G01F1/36; G01F1/40; G01F5/00; G10; G10K; G10K5/00; A; A61; A61M; A61M2206/00; A61M2206/10; A61M2206/14; A61M2206/16
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
71 words
A vortex generating flowmeter comprising: a first port; a second port; a flow measurement passage between the first and the second ports; a restriction formed in the flow passage between the first and second ports; bluff body means producing drag in the passage between the restriction and the second port; and means for sensing gas pressure in the vicinity of the bluff body means between the restriction and the second port.
Claim 2
Dependent Claim
71 words
A vortex generating flowmeter comprising: a first port; a second port; a flow measurement passage between the first and the second ports; a restriction formed in the flow passage between the first and second ports; bluff body means producing drag in the passage between the restriction and the second port; and means for sensing gas pressure in the vicinity of the bluff body means between the restriction and the second port.
Claim 3
Dependent Claim
20 words
The flowmeter of claim 1, in which the first port is an inlet and the second port is an outlet.
Claim 4
Dependent Claim
34 words
The flowmeter of claim 2, additionally comprising a gas line and means for connecting the gas line to the passage so as to induce flow through the passage from the inlet to the outlet.
Claim 5
Dependent Claim
21 words
The flowmeter of claim 2, in which the inlet, the outlet, and the passage are aligned with a common flow axis.
Claim 6
Dependent Claim
18 words
The flowmeter of claim 4, in which the restriction comprises a converging-diverging nozzle with a cylindrical throat section.
Claim 7
Dependent Claim
28 words
The flowmeter of claim 5, in which the portion of the passage between the restriction and the outlet is cylindrical and larger in cross-sectional area than the nozzle.
Claim 8
Dependent Claim
31 words
The flowmeter of claim 6, additionally comprising a rod on which the bluff body means is mounted, the rod being aligned with the common flow axis and extending through the restriction.
Claim 9
Dependent Claim
42 words
The flowmeter of claim 7, in which the bluff body means comprises first and second frustums in alignment with the common flow axis, the base of the first frustum facing the restriction, the first and second frustums being arranged vertex to vertex.
Claim 10
Dependent Claim
17 words
The flowmeter of claim 8, in which the first and second frustums are spaced from each other.
Claim 11
Dependent Claim
51 words
The flowmeter of claim 9, in which the rod is hollow and has one or more openings between the first and second frustums and the sensing means comprises a differential pressure transducer, one input of which communicates with the hollow rod to sense the pressure between the first and second frustums.
Claim 12
Dependent Claim
26 words
The flowmeter of claim 4, additionally comprising a sleeve surrounding the flow measurement passage to provide an annular flow passage bypassed by the flow measurement passage.
Claim 13
Dependent Claim
40 words
The flowmeter of claim 11, additionally comprising a gas line having a cross-sectional area larger than the sleeve and means for mounting the sleeve in the line to form a further annular passage bypassed by the first named annular passage.
Claim 14
Dependent Claim
34 words
The flowmeter of claim 12, in which the sensing means comprises a differential pressure transducer, one input of which communicates with the interior of the sleeve at a point outside the flow measurement passage.
Claim 15
Dependent Claim
34 words
The flowmeter of claim 13, in which the input of the differential pressure transducer communicates with the interior of the sleeve at a point spaced upstream from the inlet of the flow measurement passage.
Claim 16
Dependent Claim
22 words
The flowmeter of claim 2, additionally comprising a gas line and means for connecting the passage in line with the gas line.
Claim 17
Dependent Claim
21 words
The flowmeter of claim 2, additionally comprising a gas line and means for connecting the passage to bypass the gas line.
References Cited (Backward Citations)
US790888A
Cited
US1126275A
Cited
US1143631A
Cited
DE405084C
Cited
US2146371A
Cited
US2197214A
Cited
US2240119A
Cited
GB764889A
Cited
US3874234A
Cited
FR2357868A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-02-07 | 1986-08-09 | 1987-02-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-02-07 | 1990-08-09 | 1991-02-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-02-07 | 1994-08-09 | 1995-02-08 | $7700.00 | Window Closed / Lapsed |