US4003253A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multi-range vortex-shedding flowmeter
Assignee: Fischer and Porter Co
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Filing: 1975-09-08
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Granted: 1977-01-18
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Expires: 1995-09-08
Abstract
Abstract An adapter for a vortex-shedding flowmeter serving to render the meter capable of measuring low flow rates below its normal operating range. The flowmeter includes a flow tube forming a passage for the fluid to be measured and an obstacle assembly mounted therein for generating fluidic oscillations which frequency is proportional to flow rate. The adapter includes means that act to restrict the effective area of the fluid traversing the obstacle assembly, whereby for the same velocity of flow past the assembly a smaller amount of fluid is metered. By providing a set of adapters introducing different areas of restriction, the meter is then able to function as a multi-range instrument.
Inventors
- 👤 John S. Yard
- 👤 Peter J. Herzl
- 👤 Daniel Evans
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 18:14
CPC Classifications
G; G01; G01F; G01F1/00; G01F1/05; G01F1/20; G01F1/32; G01F1/3209
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
130 words
A replaceable adapter for a vortex-shedding flowmeter provided with a flow tube forming a cylindrical passage through which the fluid to be metered is conducted, said tube having a mounting flange at the inlet thereof, and an obstacle assembly mounted within the tube to create vortices whose frequency is a function of flow rate, said obstacle assembly including a block mounted cross the tube at right angles to the direction of flow, said adapter comprising a pair of rods disposed longitudinally in said flow tube on opposite sides of said block to restrict the effective area of said passage, whereby said meter is responsive to flow rates which lie below the normal operating range of the meter, said rods being cantilevered from a support flange lying against said mounting flange.
Claim 2
Dependent Claim
130 words
A replaceable adapter for a vortex-shedding flowmeter provided with a flow tube forming a cylindrical passage through which the fluid to be metered is conducted, said tube having a mounting flange at the inlet thereof, and an obstacle assembly mounted within the tube to create vortices whose frequency is a function of flow rate, said obstacle assembly including a block mounted cross the tube at right angles to the direction of flow, said adapter comprising a pair of rods disposed longitudinally in said flow tube on opposite sides of said block to restrict the effective area of said passage, whereby said meter is responsive to flow rates which lie below the normal operating range of the meter, said rods being cantilevered from a support flange lying against said mounting flange.
Claim 3
Dependent Claim
27 words
An adapter as set forth in claim 1, wherein the flow inlet end of said rods is curved to prevent an abrupt transition in the effective area.
Claim 4
Dependent Claim
15 words
An adapter as set forth in claim 1, wherein said passage has a circular cross-section.
Claim 5
Dependent Claim
44 words
An adapter as set forth in claim 3, wherein said rods are segments of a cylinder which matches the diameter of the cylindrical passage, the planar surfaces of said rods lying in parallel relation to form a restricted passage having a generally rectangular cross-section.
Claim 6
Dependent Claim
26 words
An adapter as set forth in claim 3, wherein said rods are arcuate sections of round pipe which conform to the inner wall of the tube.
Claim 7
Dependent Claim
22 words
An adapter as set forth in claim 1, wherein said rods are fabricated of a material non-reactive with the fluid being metered.
References Cited (Backward Citations)
US1935445A
Cited
US3116639A
Cited
US3147618A
Cited
US3698245A
Cited
US3724503A
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US3874234A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-01-18 | 1980-07-19 | 1981-01-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-01-18 | 1984-07-19 | 1985-01-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-01-18 | 1988-07-19 | 1989-01-18 | $7700.00 | Window Closed / Lapsed |