Patent US3576208A successfully refreshed from Google Patents.
US3576208A
Expired / Lapsed
US
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Gas turbine heat exchanger and method of making
Assignee: Ford Motor Co
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Filing: 1969-09-02
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Granted: 1971-04-27
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Expires: 1989-09-02
Abstract
Abstract A solid lubricant for the contact surfaces between a rotating ceramic regenerator and the stationary peripheral seal is forced into the openings of the gas flow passages that will bear on the seal. The lubricant adheres to the walls forming the gas flow passages and is exposed to the bearing surfaces as the walls wear. Zinc oxide can be used as the lubricant which can be applied by preparing an aqueous base putty, forcing the putty into the passages, and heating the putty to cure the lubricating material in place.
Inventors
- 👤 Donald J Cassidy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 15:41
CPC Classifications
F; F28; F28D; F28D19/00; F28D19/04; F28D19/047; Y; Y10; Y10S; Y10S165/00; Y10S165/009; Y10S165/013; Y10S165/016; Y10S165/02
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
27 words
The heat exchanger of claim 1 in which the walls defining the passages are made of ceramic materials and the lubricating composition comprises a solid refractory material.
Claim 2
Dependent Claim
46 words
The heat exchanger of claim 2 in which the regenerator core is an annular disc having said passages running generally parallel to the rotational axis of the disc, said regenerator core comprising said lubricating composition at both the inner and outer peripheries of said annular disc.
Claim 3
Dependent Claim
23 words
The heat exchanger of claim 3 in which the lubricating composition substantially fills the openings of the passages bearing on the peripheral seal.
Claim 4
Dependent Claim
137 words
A process for lubricating the sliding surfaces between a peripheral edge portion of a rotating heat exchanger and a stationary seal member in contact with said peripheral edge portion comprising: preparing a regenerator core having a plurality of closely adjacent gas conducting passages defined by relatively narrow walls, said passages existing in substantially the entire area of said core including its outer peripheral edge, preparing a pumpable mixture of a lubricating composition for the sliding surfaces of said core and said seal member, forcing said mixture of lubricating composition into the openings of said passages that will bear on said seal member, and curing said mixture in place in the openings of said passages so that wear of the walls of said core while sliding on said seal member exposes said lubricating composition to the sliding surfaces.
Claim 5
Dependent Claim
42 words
The process of claim 5 in which the walls of the regenerator core are made of a ceramic material and the mixture of lubricating composition is an aqueous base putty comprising a solid refractory material having suitable low friction and wear properties.
Claim 6
Dependent Claim
51 words
The process of claim 6 in which the refractory material is zinc oxide and comprising applying to the cured mixture a solution of a zinc compound convertible to zinc oxide by heat, removing the solvent from said applied solution, and heating the core to convert the zinc compound to zinc oxide.
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) | 1974-04-26 | 1974-10-26 | 1975-04-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-26 | 1978-10-26 | 1979-04-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-26 | 1982-10-26 | 1983-04-27 | $7700.00 | Window Closed / Lapsed |