US4332294A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gas cooler with multiply deformed lead tubes
Assignee: GEA Group AG
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Filing: 1979-04-04
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Granted: 1982-06-01
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Expires: 1999-04-04
Abstract
Abstract A heat exchanger for the cooling of a gas, especially a gas containing SO 2 , comprises a tube bundle whose tubes, composed of lead, bridge a pair of tube sheets and can be provided with internal longitudinal ribs. According to the disclosure, the extruded cylindrical tubes are reshaped by indentations in a direction transverse to the longitudinal axis. The indentations may be annular or staggered.
Inventors
- 👤 Klaus Drefahl
- 👤 Helmut Gilles
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:13
CPC Classifications
F; F28; F28F; F28F1/00; F28F1/02; F28F1/06; F28F1/08; F28F1/10; F28F1/42; F28F1/424; F28F1/426; F28F2225/00; F28F2225/04; Y; Y10; Y10S; Y10S165/00; Y10S165/355; Y10S165/40; Y10S165/401
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
157 words
An apparatus for cooling a gas containing sulphur dioxide, comprising: a heat-exchanger housing adapted to receive a liquid coolant under a pressure greater than that of said gas and provided with a pair of parallel spaced-apart tube sheets; a bundle of mutually parallel but transversely separated extruded lead tubes of substantially constant wall thickness perpendicularly spanning said tube sheets and defining between them a space for said coolant, each of said tubes being internally formed with a plurality of radially inwardly extending longitudinally fins and being deformed inwardly at axially spaced-apart locations, with formation of sets of peripherally spaced-apart indentations of spherically segmental curvature, to prevent collapse of the tubes under a pressure gradient developed thereacross between said coolant and said gas, adjacent sets of indentations being relatively angularly offset; first conduit means connected to said housing for passing said coolant through said space; and second conduit means communicating with said tubes for passing said gas therethrough.
Claim 2
Independent Claim
157 words
An apparatus for cooling a gas containing sulphur dioxide, comprising: a heat-exchanger housing adapted to receive a liquid coolant under a pressure greater than that of said gas and provided with a pair of parallel spaced-apart tube sheets; a bundle of mutually parallel but transversely separated extruded lead tubes of substantially constant wall thickness perpendicularly spanning said tube sheets and defining between them a space for said coolant, each of said tubes being internally formed with a plurality of radially inwardly extending longitudinally fins and being deformed inwardly at axially spaced-apart locations, with formation of sets of peripherally spaced-apart indentations of spherically segmental curvature, to prevent collapse of the tubes under a pressure gradient developed thereacross between said coolant and said gas, adjacent sets of indentations being relatively angularly offset; first conduit means connected to said housing for passing said coolant through said space; and second conduit means communicating with said tubes for passing said gas therethrough.
Claim 3
Independent Claim
147 words
An apparatus for cooling a gas containing sulphur dioxide, comprising: a heat-exchanger housing adapted to receive a liquid coolant under a pressure greater than that of said gas and provided with a pair of parallel spaced-apart tube sheets; a bundle of mutually parallel but transversely separated extruded lead tubes of substantially constant wall thickness perpendicularly spanning said tube sheets and defining between them a space for said coolant, each of said tubes being internally formed with a plurality of radially inwardly extending fins and being deformed inwardly at axially spaced-apart locations, with formation of annular constrictions separated by outwardly convex barrel-shaped portions, to prevent collapse of the tubes under a pressure gradient developed thereacross between said coolant and said gas; first conduit means connected to said housing for passing said coolant through said space; and second conduit means communicating with said tubes for passing said gas therethrough.
Claim 4
Independent Claim
147 words
An apparatus for cooling a gas containing sulphur dioxide, comprising: a heat-exchanger housing adapted to receive a liquid coolant under a pressure greater than that of said gas and provided with a pair of parallel spaced-apart tube sheets; a bundle of mutually parallel but transversely separated extruded lead tubes of substantially constant wall thickness perpendicularly spanning said tube sheets and defining between them a space for said coolant, each of said tubes being internally formed with a plurality of radially inwardly extending fins and being deformed inwardly at axially spaced-apart locations, with formation of annular constrictions separated by outwardly convex barrel-shaped portions, to prevent collapse of the tubes under a pressure gradient developed thereacross between said coolant and said gas; first conduit means connected to said housing for passing said coolant through said space; and second conduit means communicating with said tubes for passing said gas therethrough.
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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) | 1985-05-31 | 1985-11-30 | 1986-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-05-31 | 1989-11-30 | 1990-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-05-31 | 1993-11-30 | 1994-06-01 | $7700.00 | Window Closed / Lapsed |