Patent US4525487A successfully refreshed from Google Patents.
Patent US3520090A successfully refreshed from Google Patents.
Patent US4602674A successfully refreshed from Google Patents.
US4602674A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Two-circuit heat exchanger
Assignee: ELGE-VERKEN AB
•
Filing: 1983-02-04
•
Granted: 1986-07-29
•
Expires: 2003-02-04
Abstract
Abstract A two-circuit heat exchanger is characterized in that the heat exchange tube(s) of each circuit is/are formed with non-circular cross-section to exhibit at least partially plane side surfaces, said side surfaces of the tubes in the two circuits being in heat-exchange relationship with one another.
Inventors
- 👤 Rune Eriksson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 12:30
CPC Classifications
F; F28; F28F; F28F1/00; F28F1/02; F28D; F28D7/00; F28D7/0008; F28D7/0025; F28D7/0033; F28D7/04
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
227 words
A two-circuit heat exchanger which comprises an elongated first conduit which is coiled in the form of a planar spiral about an imaginary central axis, said first conduit forming at least a portion of a first circuit in said heat exchanger and having an elongated cross section and opposite longer sides and opposite shorter sides, said opposite longer sides including at least one portion which is generally planar, each of said generally planar portions being substantially perpendicularly oriented with respect to said imaginary central axis, a separate elongated second conduit which is coiled in the form of a planar spiral about said imaginary central axis, said second conduit forming at least a portion of a second circuit in said heat exchanger and having an elongated cross section and opposite longer sides and opposite shorter sides, said opposite longer sides including at least one portion which is generally planar, each of said generally planar portions of said second circuit being substantially perpendicularly oriented with respect to said imaginary central axis, one of said generally planar portions of at least one of the opposite longer sides of said second conduit being in direct contact with a generally planar portion of one of the opposite longer sides of said first conduit, and first and second supply means respectively connected to said first and second conduits to supply separate fluids thereto.
Claim 2
Dependent Claim
227 words
A two-circuit heat exchanger which comprises an elongated first conduit which is coiled in the form of a planar spiral about an imaginary central axis, said first conduit forming at least a portion of a first circuit in said heat exchanger and having an elongated cross section and opposite longer sides and opposite shorter sides, said opposite longer sides including at least one portion which is generally planar, each of said generally planar portions being substantially perpendicularly oriented with respect to said imaginary central axis, a separate elongated second conduit which is coiled in the form of a planar spiral about said imaginary central axis, said second conduit forming at least a portion of a second circuit in said heat exchanger and having an elongated cross section and opposite longer sides and opposite shorter sides, said opposite longer sides including at least one portion which is generally planar, each of said generally planar portions of said second circuit being substantially perpendicularly oriented with respect to said imaginary central axis, one of said generally planar portions of at least one of the opposite longer sides of said second conduit being in direct contact with a generally planar portion of one of the opposite longer sides of said first conduit, and first and second supply means respectively connected to said first and second conduits to supply separate fluids thereto.
Claim 3
Dependent Claim
88 words
The two-circuit heat exchanger as defined in claim 1, wherein each said planar spiral includes a plurality of revolutions which define nips therebetween, wherein the revolutions of one said planar spiral of one of said two circuits are offset from the revolutions of the adjacent planar spiral of the other of said two circuits, and wherein the longer side of each elongated conduit forming a planar spiral includes a fin which fits in the nip defined between the revolutions of the elongated conduit forming the adjacent planar spiral.
Claim 4
Dependent Claim
42 words
The two-circuit heat exchanger as defined in claim 2, wherein the revolutions of the elongated conduit forming one planar spiral of one circuit are offset halfway between the revolutions of the elongated conduit forming the adjacent planar spiral of the other circuit.
Claim 5
Dependent Claim
67 words
The two-circuit heat exchanger as defined in claim 2, including a plurality of elongated first and second conduits in the form of planar spirals which are connected in series to provide said first and second circuits, the planar spirals formed by said first conduits of said first circuit alternating with the planar spirals formed by said second conduits of said second circuit along said imaginary central axis.
Claim 6
Dependent Claim
33 words
The two-circuit heat exchanger as defined in claim 4, wherein said heat exchanger includes two plates which hold the elongated conduits forming the alternating planar spirals of said first and second circuits together.
Claim 7
Dependent Claim
24 words
The two-circuit heat exchanger as defined in claim 5, wherein said two plates are respectively supported by the opposing jaws of a clamping device.
Claim 8
Dependent Claim
37 words
The two-circuit heat exchanger as defined in claim 1, wherein a water-soluble film is located between the facing longer sides of said elongated first and second conduits forming said planar spirals of said first and second circuits.
Claim 9
Dependent Claim
52 words
The two-circuit heat exchanger as defined in claim 1, wherein the facing longer sides of said elongated first and second conduits forming said planar spirals of said first and second circuits are uneven, so as to improve the coefficient of heat transfer from each planar spiral of one circuit to the other.
Claim 10
Dependent Claim
38 words
The two-circuit heat exchanger as defined in claim 1, wherein said first and second conduits forming said planar spirals of said first and second circuits are mounted so as to be generally horizontally oriented, one above the other.
References Cited (Backward Citations)
US1791528A
Cited
US1799081A
Cited
US2011201A
Cited
US2324707A
Cited
US2804287A
Cited
US3086358A
Cited
FR1332607A
Cited
US3854530A
Cited
GB1313154A
Cited
GB1437460A
Cited
DE2638492A1
Cited
GB2045915A
Cited
US4287724A
Cited
US4402359A
Cited
US4347895A
Cited
US4411307A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-07-28 | 1990-01-27 | 1990-07-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-07-28 | 1994-01-27 | 1994-07-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-07-28 | 1998-01-27 | 1998-07-29 | $7700.00 | Window Closed / Lapsed |