US3846985A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for converting thermal energy into mechanical energy
Assignee: US Philips Corp
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Filing: 1973-04-16
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Granted: 1974-11-12
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Expires: 1993-04-16
Abstract
Abstract A device for converting thermal energy into mechanical energy including a combustion chamber with air and fuel inlets, a flue gas outlet, and duct means with first and second flow restriction means for mixing a portion of the flue gas into the inlet air, the air flow being directly proportional to the pressure difference across the restriction means, and the flue gas flow being proportional to the square root of the pressure difference across the second restriction means.
Inventors
- 👤 A Michels
- 👤 F Gasseling
- 👤 C Findhammer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:52
CPC Classifications
F; F02; F02G; F02G1/00; F02G1/04; F02G1/043; F02G1/045; F02G1/047; F02B; F02B1/00; F02B1/02; F02B1/04; F02M; F02M26/00; F02M2026/001; F02M2026/004; F02M26/02; F02M26/03; F02M26/52; F02M26/53; F02M26/65; F02M26/70; F23; F23N; F23N2221/00; F23N2221/08; F23N2221/12; F23N2225/00; F23N2225/04; F23N2225/06; F23N2233/00; F23N2233/06
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
157 words
In an apparatus for converting thermal energy into mechanical energy, and operable with a source of fuel and a source of air, and including a combustion chamber, a first duct for flowing air from said air source to said chamber and a second duct for discharging flue gas from said chamber, and a third return flow duct for flowing some flue gas from the second duct to the first duct, the improvement in combination therewith of flow control means comprising first restrictor means in said first duct, second restrictor means in said third duct, said third duct having a discharge end feeding said first duct at a point therein intermediate the first restrictor means and the chamber, said first restrictor means permitting air flow directly proportional to the pressure difference across said first restrictor, and said second restrictor means permitting flue gas flow directly proportional to the square root of the pressure difference across said second restrictor.
Claim 2
Dependent Claim
157 words
In an apparatus for converting thermal energy into mechanical energy, and operable with a source of fuel and a source of air, and including a combustion chamber, a first duct for flowing air from said air source to said chamber and a second duct for discharging flue gas from said chamber, and a third return flow duct for flowing some flue gas from the second duct to the first duct, the improvement in combination therewith of flow control means comprising first restrictor means in said first duct, second restrictor means in said third duct, said third duct having a discharge end feeding said first duct at a point therein intermediate the first restrictor means and the chamber, said first restrictor means permitting air flow directly proportional to the pressure difference across said first restrictor, and said second restrictor means permitting flue gas flow directly proportional to the square root of the pressure difference across said second restrictor.
Claim 3
Dependent Claim
37 words
Apparatus according to claim 1 wherein said first restrictor means is permanently adjusted and provides laminar flow of the gas therethrough, and the second restrictor means is permanently adjusted and provides turbulent flow of said gas therethrough.
Claim 4
Dependent Claim
17 words
Apparatus according to claim 2 wherein said second restrictor means comprises a diaphragm with an aperture therethrough.
Claim 5
Dependent Claim
79 words
Apparatus according to claim 1 further comprising means in said second duct for sensing the temperature therein and providing a corresponding signal, valve means in said third duct for controlling the flow therethrough, and control means operable by said temperature sensing means to adjust and control said valve means, such that when the temperature exceeds of a predetermined value in said third duct said valve will open, and conversely when temperature is below a predetermined value, said valve closes.
Claim 6
Dependent Claim
28 words
Apparatus according to claim 1 further comprising a heat exchange means engaging said first and second ducts whereby heat from said flue gas is transferred to said air.
Claim 7
Dependent Claim
13 words
Apparatus according to claim 1 wherein said apparatus is a Stirling hot-gas engine.
Claim 8
Dependent Claim
13 words
Apparatus according to claim 1 wherein said apparatus is an internal combustion engine.
Claim 9
Dependent Claim
12 words
Apparatus according to claim 1 wherein said apparatus is a hot-gas turbine.
Claim 10
Dependent Claim
17 words
Apparatus according to claim 2 wherein said third duct is formed to comprise said second restrictor means.
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) | 1977-11-11 | 1978-05-13 | 1978-11-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-11 | 1982-05-13 | 1982-11-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-11 | 1986-05-13 | 1986-11-12 | $7700.00 | Window Closed / Lapsed |