US3782457A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recuperator and method of making
Assignee: Rohr Inc
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Filing: 1971-10-26
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Granted: 1974-01-01
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Expires: 1991-10-26
Abstract
Abstract Recuperator having unusually high heat transfer capability is made up of casing with headers, and matrix having tubes extending between headers and fins integral with tubes. In preferred form a continuous web of metal foil, such as stainless steel, is repeatedly folded on itself to form multiple spaced corrugations extending from one side of web. Each corrugation is pinched together at its open edge and seam welded to produce tube integral with web. Web is then wrapped on itself in spiral arrangement to produce matrix of multiplicity of very small parallel tubes. The tubes of each wrap are in contact with the web of the adjacent wrap but not secured thereto. All portions brace each other, and integral fins provide maximum heat transfer. Tubes are rigidly connected only to headers, and mid portion of matrix is free to work in response to temperature gradients, greatly reducing localized stresses.
Inventors
- 👤 W Troy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 20:49
CPC Classifications
F; F02; F02C; F02C7/00; F02C7/08; F28; F28D; F28D9/00; F28D9/04; Y; Y02; Y02T; Y02T50/00; Y02T50/60; Y10; Y10S; Y10S165/00; Y10S165/355; Y10S165/399; Y10T; Y10T29/00; Y10T29/49; Y10T29/4935; Y10T29/49357
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
218 words
A recuperator comprising: a casing having side walls and a header at each end, and a heat exchanger matrix located within the casing; the matrix comprising a plurality of layers of heat exchanging core material arranged in overlying relation with each other; the core material consisting of metal foil web means provided with a multiplicity of elongate tubes integrally formed from the web means and arranged at one side of the web means in closely spaced parallel relation with each other and parallel with the web means; the tubes of one layer being in contact with the web means of the adjacent layer while remaining free and unsecured thereto whereby the tubes and web means are free to move relative to each other when subjected to thermal stresses produced in the respective members; the ends of the tubes extending through and being secured to their associated headers; the tubes providing a flow path through the headers and the length of the casing for the flow of a first heat exchanging fluid; fluid inlet and outlet means formed in the casing; and the spaces between the tubes, the web means, and the casing walls providing a flow path through the interior of the casing between the inlet and outlet means for the flow of a second heat exchanging fluid.
Claim 2
Dependent Claim
218 words
A recuperator comprising: a casing having side walls and a header at each end, and a heat exchanger matrix located within the casing; the matrix comprising a plurality of layers of heat exchanging core material arranged in overlying relation with each other; the core material consisting of metal foil web means provided with a multiplicity of elongate tubes integrally formed from the web means and arranged at one side of the web means in closely spaced parallel relation with each other and parallel with the web means; the tubes of one layer being in contact with the web means of the adjacent layer while remaining free and unsecured thereto whereby the tubes and web means are free to move relative to each other when subjected to thermal stresses produced in the respective members; the ends of the tubes extending through and being secured to their associated headers; the tubes providing a flow path through the headers and the length of the casing for the flow of a first heat exchanging fluid; fluid inlet and outlet means formed in the casing; and the spaces between the tubes, the web means, and the casing walls providing a flow path through the interior of the casing between the inlet and outlet means for the flow of a second heat exchanging fluid.
Claim 3
Dependent Claim
41 words
A recuperator as claimed in claim 1; the layers of core material being arranged generally circumferentially about the longitudinal axis of the casing with the tubes being directed parallel to the longitudinal axis and spaced peripherally and radially from each other.
Claim 4
Dependent Claim
21 words
A recuperator as claimed in claim 2; the core material comprising continuous web means wrapped upon itself in a spiral arrangement.
Claim 5
Dependent Claim
22 words
A recuperator as claimed in claim 1; the core material being divided into a plurality of web sections to define discrete layers.
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) | 1976-12-31 | 1977-07-02 | 1978-01-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-31 | 1981-07-02 | 1982-01-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-31 | 1985-07-02 | 1986-01-01 | $7700.00 | Window Closed / Lapsed |