US4363353A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Exhaust pipe heat exchanger
Assignee: Individual
•
Filing: 1980-08-08
•
Granted: 1982-12-14
•
Expires: 2000-08-08
Abstract
Abstract One exchanger unit comprises a length of exhaust pipe tube having a plurality of smaller heat exchange tubes which extend diametrically through the exhaust pipe tube. Each of the heat exchange tubes is canted slightly longitudinally of the exhaust pipe tube and the heat exchange tubes are disposed in a helical configuration to force the exhaust gases to swirl through the exhaust pipe tube. The heat exchanger units can be disposed in a furnace exhaust pipe or can be arranged between inlet and outlet plenums which are connected in a furnace exhaust pipe or the like.
Inventors
- 👤 Ronald B. Pranaitis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 11:24
CPC Classifications
F; F28; F28F; F28F13/00; F28F13/06; F28D; F28D21/00; F28D21/0001; F28D21/0003; F28D21/0005; F28D21/0008; F28D7/00; F28D7/0058; Y; Y10; Y10S; Y10S165/00; Y10S165/901; Y10S165/91
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
112 words
A heat exchange unit for connection in the exhaust line of a fuel burning apparatus comprising: an elongated tubing section having an inlet end and an outlet end; a plurality of exchange tubes disposed between an inlet plenum and an outlet plenum, each of said exchange tubes being further disposed transversely through said elongated tubing section with said exchange tubes, being spaced longitudinally of said tubing section, and further wherein adjacent ones of said exchange tubes are offset with the ends of said exchange tubes being disposed in a helical conformation longitudinally of the tubing section, and second heat exchange tubes being disposed transversely of each of said inlet and outlet plenums.
Claim 2
Dependent Claim
112 words
A heat exchange unit for connection in the exhaust line of a fuel burning apparatus comprising: an elongated tubing section having an inlet end and an outlet end; a plurality of exchange tubes disposed between an inlet plenum and an outlet plenum, each of said exchange tubes being further disposed transversely through said elongated tubing section with said exchange tubes, being spaced longitudinally of said tubing section, and further wherein adjacent ones of said exchange tubes are offset with the ends of said exchange tubes being disposed in a helical conformation longitudinally of the tubing section, and second heat exchange tubes being disposed transversely of each of said inlet and outlet plenums.
Claim 3
Dependent Claim
24 words
The invention as defined in claim 1 wherein said elongated tubing section is cylindrical and each of said exchange tubes passes substantially diametrically therethrough.
Claim 4
Dependent Claim
23 words
The invention as defined in claim 1 wherein said each of said exchange tubes is canted slightly longitudinally of said elongated tubing section.
Claim 5
Dependent Claim
30 words
The invention as defined in claim 1 wherein said exhaust line of a fuel burning apparatus comprises tubing having a diameter less than the diameter of said elongated tubing section.
Claim 6
Dependent Claim
20 words
The invention as defined in claim 1 wherein said elongated tubing section and said exchange tubes are produced from aluminum.
Claim 7
Dependent Claim
29 words
The invention as defined in claim 1 and further including a fan means operatively associated with said inlet and outlet plenums for forcing air through said heat exchange units.
Claim 8
Dependent Claim
39 words
The invention as defined in claim 6 and further including a thermostat means operatively engaging one of said inlet and outlet plenums for controlling operation of said fan means based on the temperature of exhaust gas in said plenum.
Claim 9
Dependent Claim
27 words
The invention as defined in claim 7 and further including a pair of walls extending between said inlet and outlet plenums on opposite sides of said plenums.
Claim 10
Dependent Claim
39 words
The invention as defined in claim 1 and further including a thermostat means operatively engaging one of said inlet and outlet plenums for controlling operation of fan means based on the temperature of exhaust gas in said one plenum.
Claim 11
Dependent Claim
36 words
The invention as defined in claim 1 and further including a pair of walls extending between said inlet plenum and said outlet plenum and extending on opposite sides of said inlet plenum and said outlet plenum.
Claim 12
Dependent Claim
24 words
The invention as defined in claim 1 wherein said elongated tubing section is cylindrical and each of said exchange tubes passes substantially diametrically therethrough.
Claim 13
Dependent Claim
23 words
The invention as defined in claim 1 wherein said each of said exchange tubes is canted slightly longitudinally of said elongated tubing section.
Claim 14
Dependent Claim
103 words
A heat exchanger for transferring heat from exhaust gases to ambient air within a room, comprising: an inlet plenum having an exhaust gas inlet; an outlet plenum having an exhaust gas outlet; a plurality of heat exchange units disposed between said inlet plenum and said outlet plenum; a plurality of first exchange tubes passing transversely through at least one of said inlet plenum and outlet plenum; and a plurality of second exchange tubes passing transversely through each of said heat exchange units, adjacent ones of said second heat exchange tubes being spaced in a helical conformation on each of said heat exchange units.
Claim 15
Dependent Claim
103 words
A heat exchanger for transferring heat from exhaust gases to ambient air within a room, comprising: an inlet plenum having an exhaust gas inlet; an outlet plenum having an exhaust gas outlet; a plurality of heat exchange units disposed between said inlet plenum and said outlet plenum; a plurality of first exchange tubes passing transversely through at least one of said inlet plenum and outlet plenum; and a plurality of second exchange tubes passing transversely through each of said heat exchange units, adjacent ones of said second heat exchange tubes being spaced in a helical conformation on each of said heat exchange units.
Claim 16
Dependent Claim
21 words
The invention as defined in claim 13 wherein said second heat exchange tubes pass diametrically through the associated heat exchange units.
Claim 17
Dependent Claim
44 words
The invention as defined in claim 14 wherein fan means is disposed adjacent one of said plenums and angularly oriented with respect thereto for drawing air from ones of said first heat exchange tubes and forcing air through other of said heat exchange tubes.
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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) | 1985-12-13 | 1986-06-14 | 1986-12-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-12-13 | 1990-06-14 | 1990-12-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-12-13 | 1994-06-14 | 1994-12-14 | $7700.00 | Window Closed / Lapsed |