Patent US3889536A successfully refreshed from Google Patents.
US3889536A
Expired / Lapsed
US
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Flow measuring and monitoring apparatus
Assignee: CARNES COMPANY Inc A WISCONSIN CORP
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Filing: 1973-03-29
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Granted: 1975-06-17
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Expires: 1993-03-29
Abstract
Abstract A restricted passage, in the form of a venturi tube, is provided in the path of a medium flowing through a confined, larger passage. A pressure sensing tap in the throat of the venturi tube and a second tap in the larger passage remote from the venturi tube are connected to provide a comparison of the pressures at the two taps. The taps are connected to a gage for providing a visual readout of the pressure difference or, in the alternative, the pressure sensing taps are connected to a control device which functions on the basis of that pressure differential. To amplify the pressure differential, an obstruction is provided in the passage adjacent to the upstream end and/or the downstream end of the venturi tube.
Inventors
- 👤 Gordon C Sylvester
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 10:53
CPC Classifications
G; G01; G01F; G01F1/00; G01F1/05; G01F1/34; G01F1/36; G01F1/40; G01F1/44
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
264 words
In combination means defining a main flow passage, walls defining a restricted passage in said main flow passage having a longitudinal axis extending generally parallel to the direction of flow through said passage, the outer surfaces of said walls being exposed directly to the interior of said main flow passage and said restricted passage characterized by upstream and downstream ends exposed directly to the interior of said main flow passage, a reduced diameter throat area spaced inwardly from said downstream end, and said walls flaring outwardly from said throat area to said downstream end, means defining a first pressure sensing taP in said restricted passage at said throat area so that the pressure sensed by said first tap corresponds to the pressure condition at said throat area, means defining a second pressure sensing tap in said main flow passage spaced from said restricted passage so that the pressure sensed by said second tap corresponds to the total pressure condition in said flow passage, output means operable in response to pressure differential, conduits connecting said first and second taps to said output means so that said output means operates in response to the pressure differential sensed by said first and second taps as a medium flows through said passage, and an annular flange attached to said walls defining said restricted passage and projecting laterally therefrom, said annular flange being located, with reference to flow through said main flow passage, adjacent at least one of said upstream and downstream ends of said restricted passage to amplify the pressure differential sensed by said first and second taps.
Claim 2
Dependent Claim
264 words
In combination means defining a main flow passage, walls defining a restricted passage in said main flow passage having a longitudinal axis extending generally parallel to the direction of flow through said passage, the outer surfaces of said walls being exposed directly to the interior of said main flow passage and said restricted passage characterized by upstream and downstream ends exposed directly to the interior of said main flow passage, a reduced diameter throat area spaced inwardly from said downstream end, and said walls flaring outwardly from said throat area to said downstream end, means defining a first pressure sensing taP in said restricted passage at said throat area so that the pressure sensed by said first tap corresponds to the pressure condition at said throat area, means defining a second pressure sensing tap in said main flow passage spaced from said restricted passage so that the pressure sensed by said second tap corresponds to the total pressure condition in said flow passage, output means operable in response to pressure differential, conduits connecting said first and second taps to said output means so that said output means operates in response to the pressure differential sensed by said first and second taps as a medium flows through said passage, and an annular flange attached to said walls defining said restricted passage and projecting laterally therefrom, said annular flange being located, with reference to flow through said main flow passage, adjacent at least one of said upstream and downstream ends of said restricted passage to amplify the pressure differential sensed by said first and second taps.
Claim 3
Dependent Claim
31 words
The combination of claim 1 wherein said restricted passage is in the form of a venturi tube having said upstream end, said downstream end, and said throat area intermediate said ends.
Claim 4
Dependent Claim
262 words
In combination means defining a main flow passage, walls defining a restricted passage in said main flow passage having a longitudinal axis extending generally parallel to the direction of flow through said passage, the outer surfaces of said walls being exposed directly to the interior of said main flow passage and said restricted passage characterized by upstream and downstream ends exposed directly to the interior of said main flow passage, a reduced diameter throat area spaced inwardly from said downstream end, and said walls flaring outwardly from said throat area to said downstream end, means defining a first pressure sensing tap in said restricted passage at said throat area so that the pressure sensed by said first tap corresponds to the pressure condition at said throat area, means defining a second pressure sensing tap in said main flow passage spaced from said restricted passage so that the pressure sensed by said second tap corresponds to the total pressure condition in said flow passage, output means operable in response to pressure differential, conduits connecting said first and second taps to said output means so that said output means operates in response to the pressure differential sensed by said first and second taps as a medium flows through said passage, and an elongated strip extending between opposed areas on the interior walls of said main flow passage and located, with reference to flow through said main flow passage, adjacent at least one of said upstream and downstream ends of said restricted passage to amplify the pressure differential sensed by said first and second taps.
Claim 5
Dependent Claim
262 words
In combination means defining a main flow passage, walls defining a restricted passage in said main flow passage having a longitudinal axis extending generally parallel to the direction of flow through said passage, the outer surfaces of said walls being exposed directly to the interior of said main flow passage and said restricted passage characterized by upstream and downstream ends exposed directly to the interior of said main flow passage, a reduced diameter throat area spaced inwardly from said downstream end, and said walls flaring outwardly from said throat area to said downstream end, means defining a first pressure sensing tap in said restricted passage at said throat area so that the pressure sensed by said first tap corresponds to the pressure condition at said throat area, means defining a second pressure sensing tap in said main flow passage spaced from said restricted passage so that the pressure sensed by said second tap corresponds to the total pressure condition in said flow passage, output means operable in response to pressure differential, conduits connecting said first and second taps to said output means so that said output means operates in response to the pressure differential sensed by said first and second taps as a medium flows through said passage, and an elongated strip extending between opposed areas on the interior walls of said main flow passage and located, with reference to flow through said main flow passage, adjacent at least one of said upstream and downstream ends of said restricted passage to amplify the pressure differential sensed by said first and second taps.
Claim 6
Dependent Claim
31 words
The combination of claim 3 wherein said restricted passage is in the form of a venturi tube having said upstream end, said downstream end, and said throat area intermediate said ends.
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) | 1978-06-16 | 1978-12-16 | 1979-06-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-16 | 1982-12-16 | 1983-06-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-16 | 1986-12-16 | 1987-06-17 | $7700.00 | Window Closed / Lapsed |