Patent US3882933A successfully refreshed from Google Patents.
US3882933A
Expired / Lapsed
US
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Heat exchanger
Assignee: General Atomics Corp
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Filing: 1971-10-28
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Granted: 1975-05-13
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Expires: 1991-10-28
Abstract
Abstract A heat exchanger is described in which a plurality of heat exchanger tubes are formed into a tube bundle. The tubes are arranged in a plurality of annular coaxial rows, each row comprising a plurality of the tubes. The tubes in each row are wound helically at a common radius with respect to the axis of the annular rows. Ducts are provided for directing a flow of heated fluid over the tubes, and the ends of respective pairs of the tubes are connected at one end of the tube bundle. Fluid to be heated is supplied to the tubes and received from the tubes at the opposite end of the tube bundle from the end at which the pairs of tubes are connected.
Inventors
- 👤 Leonard J Kube
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 16:32
CPC Classifications
F; F22; F22B; F22B1/00; F22B1/02; F22B1/18; F22B1/1823; Y; Y10; Y10S; Y10S165/00; Y10S165/355; Y10S165/40; Y10S165/427; Y10S165/436; Y10S165/437; Y10S165/438
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
232 words
A heat exchanger comprising a plurality of tube bundles, at least one tube bundle comprising a reheater having a plurality of helical heat exchanger tubes, said tubes being arranged in a plurality of coaxial annular rows along a vertical axis with each tube being in a single row, each row comprising a plurality of said tubes with said tubes in each row being wound helically with respect to the axis of said annular rows, duct means for directing a flow of a heated first fluid downwardly over said tubes along the axis of the helix toward the lower end of said tube bundle and then upwardly through the space defined by the inner one of said annular rows, means at the upper end of said tube bundle interconnecting the ends of respective pairs of said tubes, said interconnected ends being uniformly spaced circumferentially around the top of said annular rows, a first tube sheet and a plurality of interconnecting tubes extending from said first tube sheet, each to one tube in a respective one of said tube pairs, and a second tube sheet and a plurality of connecting tubes extending from said second tube sheet, each to the other tube in the respective ones of said tube pairs, said connecting tubes intersecting the respective tubes to which they extend at different positions uniformly spaced circumferentially around the bottom of said annular rows.
Claim 2
Dependent Claim
232 words
A heat exchanger comprising a plurality of tube bundles, at least one tube bundle comprising a reheater having a plurality of helical heat exchanger tubes, said tubes being arranged in a plurality of coaxial annular rows along a vertical axis with each tube being in a single row, each row comprising a plurality of said tubes with said tubes in each row being wound helically with respect to the axis of said annular rows, duct means for directing a flow of a heated first fluid downwardly over said tubes along the axis of the helix toward the lower end of said tube bundle and then upwardly through the space defined by the inner one of said annular rows, means at the upper end of said tube bundle interconnecting the ends of respective pairs of said tubes, said interconnected ends being uniformly spaced circumferentially around the top of said annular rows, a first tube sheet and a plurality of interconnecting tubes extending from said first tube sheet, each to one tube in a respective one of said tube pairs, and a second tube sheet and a plurality of connecting tubes extending from said second tube sheet, each to the other tube in the respective ones of said tube pairs, said connecting tubes intersecting the respective tubes to which they extend at different positions uniformly spaced circumferentially around the bottom of said annular rows.
Claim 3
Dependent Claim
19 words
A heat exchanger according to claim 1 wherein the tubes of each of said pairs are in adjacent rows.
Claim 4
Dependent Claim
20 words
A heat exchanger according to claim 1 wherein the tubes of each of said pairs are in the same row.
Claim 5
Dependent Claim
17 words
A heat exchanger according to claim 1 wherein said connecting means each comprise a U-shaped tube segment.
References Cited (Backward Citations)
US3071119A
Cited
US2888251A
Cited
US3130779A
Cited
US3379244A
Cited
US3298358A
Cited
US3438357A
Cited
US3338301A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-05-12 | 1978-11-11 | 1979-05-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-12 | 1982-11-11 | 1983-05-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-12 | 1986-11-11 | 1987-05-13 | $7700.00 | Window Closed / Lapsed |