Patent US4522077A successfully refreshed from Google Patents.
US4522077A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flow measuring system including a venturi
Assignee: Individual
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Filing: 1983-06-17
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Granted: 1985-06-11
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Expires: 2003-06-17
Abstract
Abstract A fluid flow measuring system composed of: a venturi connected to conduct the fluid whose flow is to be measured and having two outlet ports between which a pressure differential proportional to such fluid flow is created; a movably mounted measuring element having a selected zero position and connected to the venturi to be subjected to a displacement force corresponding to the pressure differential; a transducer unit associated with the measuring element for producing an electrical signal representative of the displacement of the measuring element from its zero position; a regulating device having a signal input connected to receive the electrical signal, and a signal output, and presenting a transfer characteristic having an integrating component such that the signal at the signal output is representative of the magnitude and duration of displacement of the measuring element from its zero position; a signal squaring circuit connected to the regulating device for generating a control signal dependent on the square of the signal at the output of said regulating device; and a hysteresis-free electromagnetic system connected to apply to the measuring element, in response to the control signal, a magnetic displacement force of a magnitude and direction to cause the measuring element to reach its zero position.
Inventors
- 👤 Karl Koberle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:06
CPC Classifications
G; G01; G01F; G01F1/00; G01F1/05; G01F1/34; G01F1/36; G01F1/38; G01F1/383
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
201 words
A fluid flow measuring system comprising: a venturi connected to conduct the fluid whose flow is to be measured and having two outlet ports between which a pressure differential proportional to such fluid flow is created; a movably mounted measuring element having a selected zero position and connected to said venturi to be subjected to a displacement force corresponding to the pressure differential; transducer means associated with said measuring element for producing an electrical signal representative of the displacement of said measuring element from its zero position; a regulating device having a signal input connected to receive said electrical signal, and a signal output, and presenting a transfer characteristic having an integrating component such that the signal at said output is representative of the magnitude and duration of displacement of said measuring element from its zero position; signal squaring means connected to said regulating device for generating a control signal dependent on the square of the signal at said output of said regulating device; and a hysteresis-free electromagnetic system connected to apply to said measuring element, in response to the control signal, a magnetic displacement force of a magnitude and direction to cause said measuring element to reach its zero position.
Claim 2
Dependent Claim
201 words
A fluid flow measuring system comprising: a venturi connected to conduct the fluid whose flow is to be measured and having two outlet ports between which a pressure differential proportional to such fluid flow is created; a movably mounted measuring element having a selected zero position and connected to said venturi to be subjected to a displacement force corresponding to the pressure differential; transducer means associated with said measuring element for producing an electrical signal representative of the displacement of said measuring element from its zero position; a regulating device having a signal input connected to receive said electrical signal, and a signal output, and presenting a transfer characteristic having an integrating component such that the signal at said output is representative of the magnitude and duration of displacement of said measuring element from its zero position; signal squaring means connected to said regulating device for generating a control signal dependent on the square of the signal at said output of said regulating device; and a hysteresis-free electromagnetic system connected to apply to said measuring element, in response to the control signal, a magnetic displacement force of a magnitude and direction to cause said measuring element to reach its zero position.
Claim 3
Dependent Claim
17 words
Flow measuring system as defined in claim 1 wherein said measuring element is a freely movable piston.
Claim 4
Dependent Claim
34 words
Flow measuring system as defined in claim 1 wherein said measuring element comprises a permanent magnet and said electromagnetic system comprises at least one fixed coil producing a magnetic field acting on said magnet.
Claim 5
Dependent Claim
49 words
Flow measuring system as defined in claim 3 wherein said measuring element is oriented such that the force due to its weight acts on said measuring element in the direction opposite to the force resulting from the pressure differential and to the magnetic force applied by said electromagnetic system.
Claim 6
Dependent Claim
59 words
Flow measuring system as defined in claim 3 wherein said measuring element is immersed in a fluid and has a weight equal to the weight of the fluid which it displaces, and said electromagnetic system comprises two coils each connected to receive a direct current and oriented for applying to said measuring element magnetic forces having respectively opposite directions.
Claim 7
Dependent Claim
43 words
Flow measuring system as defined in claim 3 wherein said squaring means comprise a diode network connected to said signal output of said regulating device for producing an output current as said control signal, and said output current is supplied to said coil.
Claim 8
Dependent Claim
41 words
Flow measuring system as defined in claim 3 wherein said squaring means produces an output current constituted by a component which varies with the square of the signal at said output of said regulating device, and a constant direct current component.
Claim 9
Dependent Claim
43 words
Flow measuring system as defined in claim 1 wherein said transducer means comprises a light barrier associated with said regulating device to act as a position sensor and positioned to produce a light beam intersecting the path of movement of said measuring element.
Claim 10
Dependent Claim
16 words
Flow measuring system as defined in claim 1 wherein said regulating device is a proportional-integral regulator.
References Cited (Backward Citations)
US1917974A
Cited
DE1110892B
Cited
GB1026602A
Cited
US3374674A
Cited
US3528289A
Cited
US3529469A
Cited
US3766779A
Cited
SU449244A1
Cited
DE2442155A1
Cited
DE2443610A1
Cited
SU514198A1
Cited
DE2751103A1
Cited
US4358964A
Cited
US4470309A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-06-10 | 1988-12-10 | 1989-06-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-06-10 | 1992-12-10 | 1993-06-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-06-10 | 1996-12-10 | 1997-06-11 | $7700.00 | Window Closed / Lapsed |