US3601182A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rim construction for gas turbine rotating heat exchangers
Assignee: Ford Motor Co
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Filing: 1969-09-02
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Granted: 1971-08-24
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Expires: 1989-09-02
Abstract
Abstract Inserts of low-friction material such as boron nitride or graphite are positioned in an undercut on the periphery of a circumferentially continuous disc type regenerator and are bonded to the regenerator by a resilient adhesive such as a silicone rubber. The inserts preferably protrude beyond the outer circumference of the regenerator and the adhesive is applied to the outer circumference and the projecting surface of the inserts. Joints at the ends of the inserts attach the inserts together to form a substantially continuous rim capable of absorbing thermal expansion without opening radial leakage paths.
Inventors
- 👤 Vemulapalli Durganageswar Rao
- 👤 John J Trudeau
- 👤 Jerry E White
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 10:51
CPC Classifications
F; F28; F28D; F28D19/00; F28D19/04; F28D19/041; F28D19/047
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
59 words
A rotatable heat exchanger for a gas turbine engine comprising a circumferentially continuous core having a plurality of gas flow passages for conducting gases through the heat exchanger, and a plurality of members fastened to the periphery of said core to form a substantially continuous rim, said rim providing a low friction, low wear rubbing surface for said core.
Claim 2
Dependent Claim
59 words
A rotatable heat exchanger for a gas turbine engine comprising a circumferentially continuous core having a plurality of gas flow passages for conducting gases through the heat exchanger, and a plurality of members fastened to the periphery of said core to form a substantially continuous rim, said rim providing a low friction, low wear rubbing surface for said core.
Claim 3
Dependent Claim
24 words
The heat exchanger of claim 1 in which the axial faces of the members are substantially coplanar with the axial face of the core.
Claim 4
Dependent Claim
23 words
The heat exchanger of claim 2 in which the core periphery contains an undercut and the members are inserts fitting into the undercut.
Claim 5
Dependent Claim
73 words
The heat exchanger of claim 3 in which the core is a disc made of a ceramic material and the undercut has an L-shaped cross section, the lateral depth of said undercut at the extreme periphery of the core being less than the lateral depth of the undercut at a location radially inward from the periphery, said inserts having an L-shaped cross section conforming in shape to the cross section of the undercut.
Claim 6
Dependent Claim
27 words
The heat exchanger of claim 4 in which the inserts are joined together by joints including a surface angled with respect to a radius of the core.
Claim 7
Dependent Claim
41 words
The heat exchanger of claim 5 in which the joints attaching the inserts to each other are mortise and tenon joints with one end of each insert containing a tenon and the other end of each insert containing a corresponding mortise.
Claim 8
Dependent Claim
34 words
The heat exchanger of claim 5 in which the joints attaching the inserts to each other are half lap joints with the surfaces of the joint being parallel to the axis of the core.
Claim 9
Dependent Claim
47 words
The heat exchanger of claim 3 in which the inserts are joined together by joints including a surface angled with respect to a radius of the core, said Joints being half lap joints with the surfaces of the joints being parallel to the axis of the core.
Claim 10
Dependent Claim
21 words
The heat exchanger of claim 1 comprising about eight to 30 inserts, said inserts being made of graphite or boron nitride.
Claim 11
Dependent Claim
100 words
A gas turbine engine including a housing, seal means mounted in said housing, and a circumferentially continuous heat exchanger mounted rotatably in said housing and having a peripheral portion sliding on said seal means, said heat exchanger comprising a plurality of narrow walls defining a plurality of closely adjacent gas flow passages, and a plurality of members fastened to the periphery of said heat exchanger where said members form a substantially continuous rim that contacts said means, said members being made of materials having a low coefficient of friction and a low wear rate when rubbing against the seal means.
Claim 12
Dependent Claim
100 words
A gas turbine engine including a housing, seal means mounted in said housing, and a circumferentially continuous heat exchanger mounted rotatably in said housing and having a peripheral portion sliding on said seal means, said heat exchanger comprising a plurality of narrow walls defining a plurality of closely adjacent gas flow passages, and a plurality of members fastened to the periphery of said heat exchanger where said members form a substantially continuous rim that contacts said means, said members being made of materials having a low coefficient of friction and a low wear rate when rubbing against the seal means.
Claim 13
Dependent Claim
40 words
The engine of claim 10 in which the heat exchanger periphery contains an undercut and the members are inserts fitting into the undercut, the axial faces of said inserts being substantially coplanar with the axial face of the heat exchanger.
Claim 14
Dependent Claim
49 words
The engine of claim 11 in which the heat exchanger is a disc made of ceramic material and the inserts extend beyond the circumferential face of the heat exchanger and comprising a bonding material fastening the projecting surface of each insert to the circumferential face of the heat exchanger.
Claim 15
Dependent Claim
40 words
The engine of claim 12 in which the radially inner surface of the undercut slopes outwardly to form an acute angle with the axial face of the heat exchanger and the inner surface of each insert has a corresponding slope.
Claim 16
Dependent Claim
38 words
The engine of claim 13 comprising spring means positioned at the outer circumference of the inserts, said spring means extending around the circumference of the inserts and exerting forces on each insert that urge the inserts radially inward.
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) | 1974-08-23 | 1975-02-22 | 1975-08-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-23 | 1979-02-22 | 1979-08-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-23 | 1983-02-22 | 1983-08-24 | $7700.00 | Window Closed / Lapsed |