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Patent US2503776A successfully refreshed from Google Patents.
US3580237A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air heater
Assignee: Marshall Sons and Co Ltd
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Filing: 1969-02-04
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Granted: 1971-05-25
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Expires: 1989-02-04
Abstract
Abstract This invention relates to an air heater comprising a combustion chamber, means to supply air and a combustible fuel to the combustion chamber, an exhaust for the products of combustion from the combustion chamber, a first duct connecting the combustion chamber to the exhaust, an inlet and an outlet for air to be heated, a second duct interconnecting the inlet and outlet, said second duct surrounding the combustion chamber for part of its length and for a different part of its length being parallel to, and sharing a common boundary with, said first duct, to define a thermal regenerator, the thermal regenerator comprising a plurality of heat transfer discs extending through said common boundary into both ducts, and means to rotate each disc about its axis of symmetry.
Inventors
- 👤 Alan Barsby
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:32
CPC Classifications
F; F24; F24H; F24H3/00; F24H3/006
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
164 words
An air heater, comprising a combustion chamber; supply means for supplying a combustible fuel to said combustion chamber; exhaust means for exhausting combustion gases from said combustion chamber; first duct means connecting said combustion chamber with said exhaust means; second duct means for air to be heated and comprising one duct section surrounding said combustion chamber and another duct section parallel to and sharing a common boundary with, said first duct means; a plurality of sets of heat transfer discs extending through said common boundary into both of said duct means, said sets of discs being spaced apart lengthwise of said duct means; rotating means for rotating each disc about the axis of symmetry of the same; and baffle means located in at least one of said duct means and extending in substantial parallelism with the plane of at least one of two discs of each of said sets so as to force said combustion gases to flow in multiple passes past said discs.
Claim 2
Dependent Claim
164 words
An air heater, comprising a combustion chamber; supply means for supplying a combustible fuel to said combustion chamber; exhaust means for exhausting combustion gases from said combustion chamber; first duct means connecting said combustion chamber with said exhaust means; second duct means for air to be heated and comprising one duct section surrounding said combustion chamber and another duct section parallel to and sharing a common boundary with, said first duct means; a plurality of sets of heat transfer discs extending through said common boundary into both of said duct means, said sets of discs being spaced apart lengthwise of said duct means; rotating means for rotating each disc about the axis of symmetry of the same; and baffle means located in at least one of said duct means and extending in substantial parallelism with the plane of at least one of two discs of each of said sets so as to force said combustion gases to flow in multiple passes past said discs.
Claim 3
Dependent Claim
29 words
An air heater as defined in claim 1, said first duct means and at least said other duct section of said second duct means being of rectangular cross section.
Claim 4
Dependent Claim
22 words
An air heater as defined in claim 1, said baffle means comprising at least one baffle located in said first duct means.
Claim 5
Dependent Claim
78 words
An air heater as defined in claim 3, said multiple passes including at least one initial pass and at least one terminal pass each including contact of said gases with different ones of said discs; and further comprising an additional baffle mounted in said other duct section and defining therein two parallel additional passes one of which includes the discs contacted in said initial pass and the other of which includes the discs contacted in said terminal pass.
Claim 6
Dependent Claim
34 words
An air heater as defined in claim 4, wherein the discs contacted in said other pass of said second duct means are the discs contacted in said initial pass of said first duct means.
Claim 7
Dependent Claim
60 words
An air heater as defined in claim 1, said rotating means comprising a rotary shaft on which said discs are mounted; and further comprising a plurality of spacers constituting said common boundary and being respectively mounted between adjacent ones of said discs slidable axially of said shaft; and biasing means urging said spacers for sliding movement axially of said shaft.
Claim 8
Dependent Claim
57 words
An air heater as defined in claim 6, said spacers being mounted to one side of the axes of said discs and having surface portions abutting against the major surfaces of respective ones of said discs under the influence of said biassing means so as to scrape said major surfaces in response to rotation of said discs.
Claim 9
Dependent Claim
18 words
An air heater as defined in claim 6, and mounting means mounting said baffle means on said spacers.
Claim 10
Dependent Claim
50 words
An air heater as defined in claim 1, in which the combustion chamber and said other duct section lie side-by-side in a common casing with the air inlet adjacent to the combustion chamber, both duct means being bent back on themselves through 180* at the same end of the casing.
References Cited (Backward Citations)
US1601355A
Cited
GB231192A
Cited
GB250172A
Cited
FR621430A
Cited
GB255418A
Cited
US3189017A
Cited
US3164145A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-05-24 | 1974-11-23 | 1975-05-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-24 | 1978-11-23 | 1979-05-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-24 | 1982-11-23 | 1983-05-25 | $7700.00 | Window Closed / Lapsed |