US3854290A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hot-gas reciprocating engine
Assignee: US Philips Corp
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Filing: 1973-08-15
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Granted: 1974-12-17
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Expires: 1993-08-15
Abstract
Abstract A hot-gas receiprocating engine including a heater housing of at least two rows of pipes which are arranged one behind the other in the flow path of combustion gases, transverse to the flow direction, the intermediate space being filled with a mass of a material which is readily heat-radiant during operation of the engine and through which the combustion gases can flow.
Inventors
- 👤 G Asselman
- 👤 A Castelijns
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 18:25
CPC Classifications
F; F02; F02G; F02G1/00; F02G1/04; F02G1/043; F02G1/053; F02G1/055; F02G2258/00; F02G2258/10
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
111 words
In a hot-gas reciprocating engine including a heater as a heat exchanger for exchanging heat between combustion gases and a working medium present in the engine, the improvement in combination therewith wherein said heater comprises at least two inner and outer rows of pipes, the rows of pipes being spaced apart in the direction of the gas flow thus forming an intermediate space between the rows, with passages for the combustion gases present between the pipes of each row, said hEater further comprising within said intermediate space a mass of hollow spherical elements which elements are readily heatradiant during operation of the engine and between which the combustion gases can flow.
Claim 2
Dependent Claim
111 words
In a hot-gas reciprocating engine including a heater as a heat exchanger for exchanging heat between combustion gases and a working medium present in the engine, the improvement in combination therewith wherein said heater comprises at least two inner and outer rows of pipes, the rows of pipes being spaced apart in the direction of the gas flow thus forming an intermediate space between the rows, with passages for the combustion gases present between the pipes of each row, said hEater further comprising within said intermediate space a mass of hollow spherical elements which elements are readily heatradiant during operation of the engine and between which the combustion gases can flow.
Claim 3
Dependent Claim
12 words
Apparatus according to claim 1 wherein said mass comprises silicon carbide (SiC).
Claim 4
Dependent Claim
47 words
Apparatus according to claim 1 further comprising a further mass adjacent to and downstream of said outer row of pipes, said further mass being porous for permitting a flow therethrough of said combustion gas and being heat-radiant for radiating heat to the adjacent outer row of pipes.
Claim 5
Dependent Claim
98 words
In a hot-gas engine including a heater which has a housing defining a central zone and an outlet radially spaced from said zone, the engine operable with a burner providing hot combustion gases which flow from said zone to said outlet, the improvement in combination therewith comprising heater tubes formed as concentric inner and outer rows generally surrounding said zone, the rows spaced apart to define between them an annular space, a mass comprising a plurality of readily heat-radiant elements situated in said annular space, with space defined between said elements through which said combustion gas can flow.
Claim 6
Dependent Claim
98 words
In a hot-gas engine including a heater which has a housing defining a central zone and an outlet radially spaced from said zone, the engine operable with a burner providing hot combustion gases which flow from said zone to said outlet, the improvement in combination therewith comprising heater tubes formed as concentric inner and outer rows generally surrounding said zone, the rows spaced apart to define between them an annular space, a mass comprising a plurality of readily heat-radiant elements situated in said annular space, with space defined between said elements through which said combustion gas can flow.
Claim 7
Dependent Claim
12 words
Apparatus according to claim 4 wherein said mass comprises hollow spherical elements.
Claim 8
Dependent Claim
47 words
Apparatus according to claim 4 further comprising a further mass adjacent to and downstream of said outer row of pipes, said further mass being porous for permitting a flow therethrough of said combustion gas and being heat-radiant for radiating heat to the adjacent outer row of pipes.
Claim 9
Dependent Claim
20 words
Apparatus according to claim 3 wherein said further mass comprises a sleeve porous to the flow of said combustion gas.
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) | 1977-12-16 | 1978-06-17 | 1978-12-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-16 | 1982-06-17 | 1982-12-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-16 | 1986-06-17 | 1986-12-17 | $7700.00 | Window Closed / Lapsed |