Patent US3890838A successfully refreshed from Google Patents.
US3890838A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tubular swirl flow meter
Assignee: Elster AG Mess und Regeltechnik
•
Filing: 1974-05-16
•
Granted: 1975-06-24
•
Expires: 1994-05-16
Abstract
Abstract The accuracy and range (in terms of the Reynolds numbers of fluids) of tubular swirl flow meters is increased by providing an annular shoulder in the measuring tube and mounting the measuring sensor within the zone of influence of the shoulder either upstream or downstream thereof.
Inventors
- 👤 Wolf Paetzold
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 15:50
CPC Classifications
G; G01; G01F; G01F1/00; G01F1/05; G01F1/20; G01F1/32; G01F1/3236
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
66 words
In a tubular swirl flow meter having a measuring tube, a swirl device at the entrance thereto and a measuring sensor downstream from the swirl device, the improvement wherein an annular shoulder is provided in the measuring tube near the sensor, the height of said shoulder being approximately equal to the normal thickness of the boundary layer for the flowing fluid having the smallest Reynolds number.
Claim 2
Dependent Claim
66 words
In a tubular swirl flow meter having a measuring tube, a swirl device at the entrance thereto and a measuring sensor downstream from the swirl device, the improvement wherein an annular shoulder is provided in the measuring tube near the sensor, the height of said shoulder being approximately equal to the normal thickness of the boundary layer for the flowing fluid having the smallest Reynolds number.
Claim 3
Dependent Claim
22 words
Structure in accordance with claim 1 wherein the sensor is upstream from and within the zone of influence of the annular shoulder.
Claim 4
Dependent Claim
22 words
Structure in accordance with claim 1 wherein the sensor is downstream from and within the zone of influence of the annular shoulder.
Claim 5
Dependent Claim
32 words
Structure in accordance with claim 1 wherein the measuring tube comprises a converging conical entrance followed by a cylindrical section and the sensor and annual shoulder are located in said cylindrical section.
Claim 6
Dependent Claim
39 words
Structure in accordance with claim 1 wherein the measuring tube comprises a converging conical entrance followed by a diverging conical exit section, the annular shoulder being located at the junction of the conical entrance end of the conical exit.
References Cited (Backward Citations)
US3616693A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-06-23 | 1978-12-23 | 1979-06-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-23 | 1982-12-23 | 1983-06-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-23 | 1986-12-23 | 1987-06-24 | $7700.00 | Window Closed / Lapsed |