US4914904A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oil cooler for fan jet engines
Assignee: Avco Corp
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Filing: 1988-11-09
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Granted: 1990-04-10
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Expires: 2008-11-09
Abstract
Abstract A turbo fan gas turbine engine is disclosed which includes a central engine and a shroud-enclosed fan, the shroud being supported by a plurality of structural struts extending from the central engine to the shroud. A plurality of tubes internal to each strut are provided with fins to increase their effective internal surface areas. Means are provided for connecting the tubes to a source of heated hydrocarbon liquid and for providing a return from the tubes to the source of hydrocarbon liquid, whereby the tubes provide cooling for the liquid. In a preferred embodiment of the invention, the tubes are surrounded by a highly conductive cement to provide support and improved heat transfer between the tubes and the struts.
Inventors
- 👤 Marvin J. Parnes
- 👤 Herman Vogel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:09
CPC Classifications
F; F02; F02K; F02K3/00; F02K3/02; F02K3/04; F01; F01D; F01D25/00; F01D25/18; F01D9/00; F01D9/06; F01D9/065; F02C; F02C7/00; F02C7/12; F02C7/14; Y; Y02; Y02T; Y02T50/00; Y02T50/60
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
99 words
In a turbo fan gas turbine engine including a central engine and a shroud enclosed fan, the combination comprising: a plurality of structural struts, each said strut extending from said central engine to said shroud; a plurality of tubes, internal to each said strut, each said tube being directly thermally connected along its length to said strut by a solid high thermal conductivity pathway; means for connecting said tubes to a source of heated hydrocarbon liquid; and means for providing a return from said tubes to said source of hydrocarbon liquid whereby said tubes provide cooling for said liquid.
Claim 2
Dependent Claim
99 words
In a turbo fan gas turbine engine including a central engine and a shroud enclosed fan, the combination comprising: a plurality of structural struts, each said strut extending from said central engine to said shroud; a plurality of tubes, internal to each said strut, each said tube being directly thermally connected along its length to said strut by a solid high thermal conductivity pathway; means for connecting said tubes to a source of heated hydrocarbon liquid; and means for providing a return from said tubes to said source of hydrocarbon liquid whereby said tubes provide cooling for said liquid.
Claim 3
Dependent Claim
26 words
The invention as defined in claim 1 wherein said tubes are provided with internal means to increase the effective internal surface area of each said tube.
Claim 4
Dependent Claim
17 words
The invention as defined in claim 2 wherein each said tube includes a plurality of internal fins.
Claim 5
Dependent Claim
58 words
The invention as defined in claim 2 wherein each said strut is internally hollow and said tubes are resident therein, the combination further comprising: a high conductivity cement filling said hollow area of each said strut and intimately contacting said tubes, to thereby immobilize said tubes and provide a direct thermal pathway between said tubes and said strut.
Claim 6
Dependent Claim
24 words
The invention as defined in claim 4 wherein tubes, in adjacent radially disposed struts, are connected in series fashion to provide additional cooling capacity.
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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) | 1993-04-09 | 1993-10-09 | 1994-04-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-04-09 | 1997-10-09 | 1998-04-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-04-09 | 2001-10-09 | 2002-04-10 | $7700.00 | Window Closed / Lapsed |