Patent US3852961A successfully refreshed from Google Patents.
US3852961A
Expired / Lapsed
US
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Heat exchanger pre-heating combustion air in a stirling cycle engine
Assignee: United Stirling AB and Co
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Filing: 1973-02-16
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Granted: 1974-12-10
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Expires: 1993-02-16
Abstract
Abstract A Stirling cycle engine has a heat exchanger located between two combustion chambers to pre-heat combustion air by means of exhaust gases flowing through the heat exchanger.
Inventors
- 👤 N Salomonsson
- 👤 B Torstensson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 11:46
CPC Classifications
F; F02; F02G; F02G1/00; F02G1/04; F02G1/043; F02G1/053; F02G1/055; F02G1/044; F02G2244/00; F02G2244/50; F02G2255/00
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
99 words
A multi-cylinder hot gas Stirling cycle engine having at least two combustion chambers external to the cylinders of the kind affording increasing dimensions in the direction away from the point of fuel injection, said two chambers for corresponding ones of said cylinders located with a common passageway therebetween, a heat exchanger positioned in said passageway, and structure surrounding said cylinders passing combustion air for said external combustion chambers through said heat exchanger and for passing exhaust gases from said two external combustion chambers through said exchanger in a heat-exchanger relationship to pre-heat said combustion air with said exhaust gases.
Claim 2
Dependent Claim
99 words
A multi-cylinder hot gas Stirling cycle engine having at least two combustion chambers external to the cylinders of the kind affording increasing dimensions in the direction away from the point of fuel injection, said two chambers for corresponding ones of said cylinders located with a common passageway therebetween, a heat exchanger positioned in said passageway, and structure surrounding said cylinders passing combustion air for said external combustion chambers through said heat exchanger and for passing exhaust gases from said two external combustion chambers through said exchanger in a heat-exchanger relationship to pre-heat said combustion air with said exhaust gases.
Claim 3
Dependent Claim
43 words
An engine according to claim 1, in which at least two rows of cylinders are disposed in a V as viewed in a plan section perpendicular to the axis of the crank-shaft, and the combustion chambers are provided with downwardly directed fuel injection.
Claim 4
Dependent Claim
44 words
An engine according to claim 1, characterized in that it is provided with ducts for delivering air to the heat exchanger through a path extending upwardly along the sides of the engine and towards the center of the engine along the top surface thereof.
Claim 5
Dependent Claim
43 words
An engine according to claim 3, characterized in that each of two ducts for withdrawing combustion gases from the heat-exchanger extends parallel to the direction of the axis of the engine crank-shaft and is located between the heat-exchanger and an adjacent burner unit.
Claim 6
Dependent Claim
40 words
An engine according to claim 3, having two heat exchange elements characterized in that a single duct for withdrawing exhaust gases from the heat-exchanger extends parallel to the axis of the crank-shaft and is located between said two heat-exchanging elements.
References Cited (Backward Citations)
US3180078A
Cited
US3085558A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-12-09 | 1978-06-10 | 1978-12-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-09 | 1982-06-10 | 1982-12-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-09 | 1986-06-10 | 1986-12-10 | $7700.00 | Window Closed / Lapsed |