US3610595A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ceramic recuperators
Assignee: British Iron and Steel Research Association BISRA
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Filing: 1969-12-22
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Granted: 1971-10-05
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Expires: 1989-12-22
Abstract
Abstract A recuperator suitable for location in the waste-gas offtake of a slab reheating furnace or soaking hearth. The recuperator includes a plurality of integrally formed tubes of ceramic material extending with clearance into each of oppositely facing portions of the offtake duct and communicating at their ends with header boxes sealed to the outside of the duct. The header boxes connect the tubes in series so that fluid to be heated during use of the recuperator pass sequentially through the series connected tubes. The clearance between one end of each tube and the duct wall is sealed by an annular seal disposed in the region of the outside surface of the duct wall, said one end being slidable relative to its respective seal to allow for longitudinal tube expansion.
Inventors
- 👤 William Robert Laws
- 👤 David Arthur Winkworth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 04:11
CPC Classifications
F; F28; F28D; F28D7/00; F28D7/16; F28D7/1615; F28D7/1623
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
196 words
A recuperator for transferring heat from a first, hotter, fluid to a second, colder, fluid, comprising a duct for the passage therethrough of the first fluid, a plurality of integrally formed tubes of ceramic material extending with clearance into each of oppositely facing fixed portions of the duct wall and communicating at their ends with header boxes sealed to the outside surface of the duct wall, the header boxes connecting in series at least some of the tubes so that the second fluid, during use of the recuperator passes sequentially through the series connected tubes, the clearance between the outer surface of one end of each tube and the duct wall being sealed by an annular seal disposed in the region of the outside surface of the duct wall, each said one end being slidable relative to its respective seal to allow for tube expansion in a longitudinal direction, each said seal having a length dimension along the length of a respective tube greater than the seal thickness, and wherein means are provided to apply a compressive force to the seal in the direction of its length, which force is reacted against the adjacent duct wall.
Claim 2
Dependent Claim
196 words
A recuperator for transferring heat from a first, hotter, fluid to a second, colder, fluid, comprising a duct for the passage therethrough of the first fluid, a plurality of integrally formed tubes of ceramic material extending with clearance into each of oppositely facing fixed portions of the duct wall and communicating at their ends with header boxes sealed to the outside surface of the duct wall, the header boxes connecting in series at least some of the tubes so that the second fluid, during use of the recuperator passes sequentially through the series connected tubes, the clearance between the outer surface of one end of each tube and the duct wall being sealed by an annular seal disposed in the region of the outside surface of the duct wall, each said one end being slidable relative to its respective seal to allow for tube expansion in a longitudinal direction, each said seal having a length dimension along the length of a respective tube greater than the seal thickness, and wherein means are provided to apply a compressive force to the seal in the direction of its length, which force is reacted against the adjacent duct wall.
Claim 3
Dependent Claim
51 words
A recuperator according to claim 1, in which each said seal in its uncompressed state extends beyond the outside surface of the duct wall and the means to apply a compressive force is an annular clamping ring operable to be held by means of a bayonet fitting to the duct wall.
Claim 4
Dependent Claim
44 words
A recuperator according to claim 1, wherein the clearance between the outer surface of the other end of each tube and the duct wall is sealed by a further seal, each other end being held against sliding movement relative to its respective further seal.
Claim 5
Dependent Claim
48 words
A recuperator according to claim 3, wherein each other end is held by means of a clamping means secured to the outside surface of the duct wall and operable to urge a flange formed on the tube at said other end into sealing engagement with said further seal.
Claim 6
Dependent Claim
32 words
A recuperator according to claim 1, wherein the bore surface at an eNd of said tube is screw-threaded or otherwise shaped to facilitate the removal of a defective tube from the recuperator.
Claim 7
Dependent Claim
50 words
A recuperator according to claim 5, wherein the outside surface at an opposite end of said tubes is screw-threaded or otherwise shaped so that a similar replacement tube may be screwed into the screw threads of the bore of a defective tube to enable the removal of the defective tube.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-10-04 | 1975-04-05 | 1975-10-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-10-04 | 1979-04-05 | 1979-10-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-10-04 | 1983-04-05 | 1983-10-05 | $7700.00 | Window Closed / Lapsed |