Patent US3640307A successfully refreshed from Google Patents.
US3640307A
Expired / Lapsed
US
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Apparatus for balancing fluid distribution systems
Assignee: Madison Management Group Inc
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Filing: 1970-02-24
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Granted: 1972-02-08
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Expires: 1990-02-24
Abstract
Abstract Apparatus for balancing the flow of a gaseous substance in the branch of a fluid distribution system comprising a set of variable gates to regulate the volume flow input, a screen to establish a pressure differential along the length of the unit and a pressure differential measuring system capable of detecting and measuring the pressure drop in the unit due to the screen as a function of the input flow rate and to allow regulation of the output flow by altering the input flow rate in accordance with prior calibration of the measuring system.
Inventors
- 👤 Raymond J Drzala
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 14:37
CPC Classifications
G; G01; G01F; G01F1/00; G01F1/05; G01F1/34; G01F1/36; G01F1/40; G01F1/42; F; F24; F24F; F24F11/00; F24F11/70; F24F11/72; F24F11/74; Y; Y10; Y10T; Y10T137/00; Y10T137/8158; Y10T137/8326; Y10T137/8593; Y10T137/87265; Y10T137/8741; Y10T137/87418; Y10T137/87442
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
373 words
Apparatus for measuring and contRolling the flow of air in an air distribution system, comprising: a. a housing having opposed entrance and exit ends and being adapted to be installed in series with an air carrying duct system; b. damper means located within said housing adjacent the entrance end thereof and being adjustable to vary the volume of airflow through said housing between a maximum value and a minimum value; c. a total pressure measuring device mounted in said housing downstream of said damper, said total pressure measuring device comprising a hollow tube extending transversely across said housing from one sidewall of said housing to the other sidewall of said housing in a direction perpendicular to the flow of air therethrough and having at least two pairs of apertures facing directly into the direction of flow of air, the apertures of one of said pairs each being located within about 1 inch of a respective one of said sidewalls and the apertures of the other of said pairs each being located within about 2 to 7 inches of a respective one of said sidewalls, said tube being located downstream of said damper a selected distance at least great enough that turbulence of the airflow in said housing resulting from throttling action of said damper is reduced sufficiently for accurate measurement of total pressure by said total pressure measuring device; d. a screen located in said housing downstream of said hollow tube and having a multiplicity of air-admitting apertures, said screen extending across said housing transversely of the direction of flow of air whereby a pressure drop occurs across said screen; e. a static pressure measuring device located in said housing downstream of said screen; f. a differential pressure indicating device having two air inlets; and g. means intercoupling the opposite ends of said tube and one of said air inlets of said differential pressure indicating device and intercoupling said static pressure measuring device and the other air inlet of said differential pressure indicating device whereby said differential pressure indicating device can indicate the calibration pressure existing within said housing between said total pressure measuring device and said static pressure measuring device as a measure of the volume of air flowing through said housing.
Claim 2
Dependent Claim
373 words
Apparatus for measuring and contRolling the flow of air in an air distribution system, comprising: a. a housing having opposed entrance and exit ends and being adapted to be installed in series with an air carrying duct system; b. damper means located within said housing adjacent the entrance end thereof and being adjustable to vary the volume of airflow through said housing between a maximum value and a minimum value; c. a total pressure measuring device mounted in said housing downstream of said damper, said total pressure measuring device comprising a hollow tube extending transversely across said housing from one sidewall of said housing to the other sidewall of said housing in a direction perpendicular to the flow of air therethrough and having at least two pairs of apertures facing directly into the direction of flow of air, the apertures of one of said pairs each being located within about 1 inch of a respective one of said sidewalls and the apertures of the other of said pairs each being located within about 2 to 7 inches of a respective one of said sidewalls, said tube being located downstream of said damper a selected distance at least great enough that turbulence of the airflow in said housing resulting from throttling action of said damper is reduced sufficiently for accurate measurement of total pressure by said total pressure measuring device; d. a screen located in said housing downstream of said hollow tube and having a multiplicity of air-admitting apertures, said screen extending across said housing transversely of the direction of flow of air whereby a pressure drop occurs across said screen; e. a static pressure measuring device located in said housing downstream of said screen; f. a differential pressure indicating device having two air inlets; and g. means intercoupling the opposite ends of said tube and one of said air inlets of said differential pressure indicating device and intercoupling said static pressure measuring device and the other air inlet of said differential pressure indicating device whereby said differential pressure indicating device can indicate the calibration pressure existing within said housing between said total pressure measuring device and said static pressure measuring device as a measure of the volume of air flowing through said housing.
Claim 3
Dependent Claim
93 words
Apparatus for measuring and controlling the flow of air in an air distribution system, comprising: a. a housing having opposed entrance and exit ends and being adapted to be installed in series with an air carrying duct system; b. damper means located within said housing adjacent the entrance end thereof and being adjustable to vary the volume of airflow through said housing between a maximum value and a minimum value; and c. means for indicating the calibration pressure within said housing as a measure of the volume of airflow through said housing comprising:
Claim 4
Dependent Claim
93 words
Apparatus for measuring and controlling the flow of air in an air distribution system, comprising: a. a housing having opposed entrance and exit ends and being adapted to be installed in series with an air carrying duct system; b. damper means located within said housing adjacent the entrance end thereof and being adjustable to vary the volume of airflow through said housing between a maximum value and a minimum value; and c. means for indicating the calibration pressure within said housing as a measure of the volume of airflow through said housing comprising:
Claim 5
Dependent Claim
66 words
a screen located in said housing downstream of said hollow tube and having a multiplicity of apertures, said screen extending across said housing transversely to the direction of flow of air, the open area provided by said apertures in said screen being less than one-half the cross sectional area of said housing at the locatiOn of said screen whereby a pressure drop occurs across said screen;
Claim 6
Dependent Claim
66 words
a screen located in said housing downstream of said hollow tube and having a multiplicity of apertures, said screen extending across said housing transversely to the direction of flow of air, the open area provided by said apertures in said screen being less than one-half the cross sectional area of said housing at the locatiOn of said screen whereby a pressure drop occurs across said screen;
Claim 7
Dependent Claim
13 words
a static pressure measuring device located in said housing downstream of said screen;
Claim 8
Dependent Claim
13 words
a static pressure measuring device located in said housing downstream of said screen;
Claim 9
Dependent Claim
10 words
a differential pressure indicating device having two air inlets; and
Claim 10
Dependent Claim
10 words
a differential pressure indicating device having two air inlets; and
Claim 11
Dependent Claim
65 words
means intercoupling the opposite ends of said tube and one of said air inlets of said differential pressure indicating device and intercoupling said static pressure measuring device and the other air inlet of said differential pressure indicating device whereby said differential pressure indicating device can indicate the calibration pressure existing within said housing between said total pressure measuring device and said static pressure measuring device.
Claim 12
Dependent Claim
65 words
means intercoupling the opposite ends of said tube and one of said air inlets of said differential pressure indicating device and intercoupling said static pressure measuring device and the other air inlet of said differential pressure indicating device whereby said differential pressure indicating device can indicate the calibration pressure existing within said housing between said total pressure measuring device and said static pressure measuring device.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-02-07 | 1975-08-09 | 1976-02-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-07 | 1979-08-09 | 1980-02-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-07 | 1983-08-09 | 1984-02-08 | $7700.00 | Window Closed / Lapsed |