US3733900A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fan capacity measuring station
Assignee: AIR MONITOR CORP
•
Filing: 1971-11-22
•
Granted: 1973-05-22
•
Expires: 1991-11-22
Abstract
Abstract A fan capacity measuring station wherein the fan discharge is first conditioned for accurate flow rate measurement by fixed mixing vanes that break up stratification and negative pressure pockets and by subsequent straightening means that eliminate turbulence and produce substantially laminar air flow through a measuring section of known cross-sectional area. Then in the measuring section total pressure sensors, manifolded in a traverse, average the total pressure and manifolded static pressure sensors average the static pressure. The difference between the average total and static pressure of the conditioned discharge is a direct and accurate measurement of flow rate within + OR - 1 percent.
Inventors
- 👤 Baun K De
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 15:25
CPC Classifications
G; G01; G01F; G01F1/00; G01F1/05; G01F1/34; G01F1/36; G01F1/40
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
91 words
A method for measuring air flow at a flow measuring station comprising the steps of first turbulently mixing air flowing to the station to eliminate substantially all stratification; then eliminating turbulence in the mixed air to produce substantially laminar flow through a known cross-sectional area; sensing the average total pressure of air flowing at said crosssectional area; sensing the average static pressure at said cross-sectional area; and then employing the difference in the average total pressure and average static pressure as a direct measurement of air flow at said cross-sectional area.
Claim 2
Independent Claim
91 words
A method for measuring air flow at a flow measuring station comprising the steps of first turbulently mixing air flowing to the station to eliminate substantially all stratification; then eliminating turbulence in the mixed air to produce substantially laminar flow through a known cross-sectional area; sensing the average total pressure of air flowing at said crosssectional area; sensing the average static pressure at said cross-sectional area; and then employing the difference in the average total pressure and average static pressure as a direct measurement of air flow at said cross-sectional area.
Claim 3
Dependent Claim
97 words
An air flow measuring station comprising a casing; a mixing section turbulently mixing air flowing in said casing to eliminate substantially all stratification; straightening means eliminating turbulence in the mixed air to produce substantially laminar flow through a known cross-sectional area of said casing; first sensor means sensing the average total pressure of air flowing at said cross-sectional area; second sensor means sensing the average static pressure at said cross-sectional area; and meter means employing the difference in the average total pressure and average static pressure as a direct measurement of air flow at said cross-sectional area.
Claim 4
Dependent Claim
97 words
An air flow measuring station comprising a casing; a mixing section turbulently mixing air flowing in said casing to eliminate substantially all stratification; straightening means eliminating turbulence in the mixed air to produce substantially laminar flow through a known cross-sectional area of said casing; first sensor means sensing the average total pressure of air flowing at said cross-sectional area; second sensor means sensing the average static pressure at said cross-sectional area; and meter means employing the difference in the average total pressure and average static pressure as a direct measurement of air flow at said cross-sectional area.
Claim 5
Dependent Claim
32 words
The air flow measuring station of claim 2 wherein said mixing section comprises fixed deflection vanes having a plurality of fins mounted at an angle to the axis of said air flow.
Claim 6
Dependent Claim
19 words
The air flow measuring station of claim 2 wherein said mixing station comprises at least one expanded metal grid.
Claim 7
Dependent Claim
30 words
The air flow measuring station of claim 2 wherein said straightening means comprises a honeycomb of tubular passages aligned with the direction of air flow downstream of said mixing means.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-05-21 | 1976-11-20 | 1977-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-21 | 1980-11-20 | 1981-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-21 | 1984-11-20 | 1985-05-22 | $7700.00 | Window Closed / Lapsed |