US4559835A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flow measuring traverse probe
Assignee: AIR MONITOR Corp A CORP OF
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Filing: 1984-02-15
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Granted: 1985-12-24
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Expires: 2004-02-15
Abstract
Abstract A traverse probe for insertion transversely with respect to the direction of bulk flow of an air or gas stream to sense and average a traverse of the static pressure and separately to sense and average a traverse of the combination of static and velocity pressure or total pressure of the stream. The probe includes along its length a spaced set of total pressure ports in the tube wall substantially aligned with the direction of flow in the zone of positive total pressure at the tube wall facing the direction of flow and first and second spaced sets of static pressure ports in the tube wall, one set aligned in each of the zones of static pressure only that lie at the tube wall adjacent to and on each side of the zone of positive total pressure. The set of total pressure ports is aligned on the bisector of the included angle between the sets of static pressure ports where the included angle is in the range of about 78°-80° for useful probe diameters.
Inventors
- 👤 Kenneth W. DeBaun
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 21:06
CPC Classifications
G; G01; G01F; G01F1/00; G01F1/05; G01F1/34; G01F1/36; G01F1/40; G01F1/46
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
211 words
A traverse probe for measuring the bulk flow of an air or gas stream comprising a cylindrical tube disposed transversely with respect to the direction of stream flow to develop a pressure distribution around the exterior tube surface which includes a zone of positive total pressure at the tube wall facing the direction of flow and separated zones at the tube wall of static pressure only adjacent to and on each side of the zone of positive total pressure; a spaced set of total pressure ports in the tube wall aligned substantially with the direction of bulk flow in said zone of positive total pressure, said total pressure ports being chamfered at their inlet end facing into the stream flow with a chamfer angle in the range of 45°-60°; a first spaced set of static pressure ports in the tube wall aligned in one of the zones of static pressure only; a second spaced set of static pressure ports in the tube wall aligned in the other zone of static pressure only; and two separate conduits formed within the wall of the tube, one manifolding all of the total pressure ports in communication with one another and the other manifolding in communication with one another all of the static pressure ports.
Claim 2
Dependent Claim
211 words
A traverse probe for measuring the bulk flow of an air or gas stream comprising a cylindrical tube disposed transversely with respect to the direction of stream flow to develop a pressure distribution around the exterior tube surface which includes a zone of positive total pressure at the tube wall facing the direction of flow and separated zones at the tube wall of static pressure only adjacent to and on each side of the zone of positive total pressure; a spaced set of total pressure ports in the tube wall aligned substantially with the direction of bulk flow in said zone of positive total pressure, said total pressure ports being chamfered at their inlet end facing into the stream flow with a chamfer angle in the range of 45°-60°; a first spaced set of static pressure ports in the tube wall aligned in one of the zones of static pressure only; a second spaced set of static pressure ports in the tube wall aligned in the other zone of static pressure only; and two separate conduits formed within the wall of the tube, one manifolding all of the total pressure ports in communication with one another and the other manifolding in communication with one another all of the static pressure ports.
Claim 3
Dependent Claim
29 words
The traverse probe of claim 1 wherein the first and second sets of static pressure ports are aligned an equal angular distance from the alignment of total pressure ports.
Claim 4
Dependent Claim
26 words
The traverse probe of claim 2 wherein the angular distance from the alignment of total pressure ports is in the range of 39 to 40 degrees.
Claim 5
Dependent Claim
25 words
The traverse probe of claim 1 wherein the sets of static and total pressure ports extend along substantially the full length of the cylindrical tube.
Claim 6
Dependent Claim
21 words
The traverse probe of claim 1 for circular ducts has the pressure ports spaced to be located in equal concentric areas.
Claim 7
Dependent Claim
16 words
The probe of claim 1 further including differential pressure means to indicate or control flow velocity.
Claim 8
Dependent Claim
33 words
The traverse probe of claim 6 wherein the averaged static and total pressures connect to the differential pressure means at about the geometric center of the sets of static and total pressure ports.
Claim 9
Dependent Claim
17 words
The traverse probe of claim 1 wherein the chamfer angle for the total pressure ports is 60°.
Claim 10
Dependent Claim
24 words
The traverse probe of claim 1 wherein the total and static pressure ports are in the range of 0.02 to 0.07 inches in diameter.
References Cited (Backward Citations)
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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) | 1988-12-23 | 1989-06-24 | 1989-12-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-12-23 | 1993-06-24 | 1993-12-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-12-23 | 1997-06-24 | 1997-12-24 | $7700.00 | Window Closed / Lapsed |