US3717993A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preheater assembly for stirling engine
Assignee: Motors Liquidation Co
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Filing: 1970-11-02
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Granted: 1973-02-27
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Expires: 1990-11-02
Abstract
Abstract An air preheater for an external combustion engine which is supported around the engine cylinder to form a combustion chamber therebetween. Air enters the preheater inlet and flows through an annular flow passage in counter direction to the hot exhaust gas which flows through an abutting annular flow passage. The passages are separated by a thermally conductive wall. Insulation on the outer walls of the preheater prevents heat loss from intake air to atmosphere and an insulated divider wall separates the hot gas flow passage from the combustion chamber to prevent reheating of the exhaust gas.
Inventors
- 👤 R Potter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 04:36
CPC Classifications
F; F02; F02G; F02G1/00; F02G1/04; F02G1/043; F02G1/053; F02G1/055; F02G2270/00; F02G2270/42; F02G2270/425
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
336 words
An air preheater for an external combustion engine which has a cylinder enclosing a gas-filled working space comprising: a cylindrical burner can having a first open end adapted to be supported around the end of said cylinder to form a combustion chamber between said burner can and said cylinder for supplying thermal energy to gas in said cylinder; the second end of said cylinder burner can being opened to form an air inlet to said combustion chamber; a first cylindrical wall connected to the second end of said burner can and extending axially away from said combustion chamber; a second cylindrical wall encircling said first cylindrical wall and spaced radially outward; a cylindrical outer wall of the preheater around said first and second walls; said first and second cylindrical walls being connected together along adjacent edges to form connected annular air inlet passages between said outer cylindrical wall and said first and second cylindrical walls; said cylindrical burner can having exhaust openings through its cylindrical side surface for discharging hot exhaust gas from said combustion chamber; a cylindrical divider wall connected to said first end of the burner can and extending in an axial direction past said second end of the burner can and between said first and second cylindrical walls to form a hot gas passage extending from said exhaust openings along one side of said divider wall and said first cylindrical wall and then back along the other side of said divider wall and along said second cylindrical wall whereby thermal energy is transmitted through said first and second cylindrical walls from the hot exhaust gases to air flowing into the combustion chamber through said air inlet passage; insulating means on said divider wall for preventing the transmittal of heat from the hot gases in the radially inward portion of the Exhaust passageway to the lower temperature hot gases in the radially outward portion of the discharge passage thus preventing the wasteful reheating of the cooler exhaust gases further away from the combustion chamber.
Claim 2
Dependent Claim
336 words
An air preheater for an external combustion engine which has a cylinder enclosing a gas-filled working space comprising: a cylindrical burner can having a first open end adapted to be supported around the end of said cylinder to form a combustion chamber between said burner can and said cylinder for supplying thermal energy to gas in said cylinder; the second end of said cylinder burner can being opened to form an air inlet to said combustion chamber; a first cylindrical wall connected to the second end of said burner can and extending axially away from said combustion chamber; a second cylindrical wall encircling said first cylindrical wall and spaced radially outward; a cylindrical outer wall of the preheater around said first and second walls; said first and second cylindrical walls being connected together along adjacent edges to form connected annular air inlet passages between said outer cylindrical wall and said first and second cylindrical walls; said cylindrical burner can having exhaust openings through its cylindrical side surface for discharging hot exhaust gas from said combustion chamber; a cylindrical divider wall connected to said first end of the burner can and extending in an axial direction past said second end of the burner can and between said first and second cylindrical walls to form a hot gas passage extending from said exhaust openings along one side of said divider wall and said first cylindrical wall and then back along the other side of said divider wall and along said second cylindrical wall whereby thermal energy is transmitted through said first and second cylindrical walls from the hot exhaust gases to air flowing into the combustion chamber through said air inlet passage; insulating means on said divider wall for preventing the transmittal of heat from the hot gases in the radially inward portion of the Exhaust passageway to the lower temperature hot gases in the radially outward portion of the discharge passage thus preventing the wasteful reheating of the cooler exhaust gases further away from the combustion chamber.
References Cited (Backward Citations)
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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) | 1976-02-27 | 1976-08-28 | 1977-02-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-27 | 1980-08-28 | 1981-02-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-27 | 1984-08-28 | 1985-02-27 | $7700.00 | Window Closed / Lapsed |