US3783854A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flow-through self-cleaning gas oven with heat exchanger
Assignee: General Electric Co
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Filing: 1972-08-01
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Granted: 1974-01-08
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Expires: 1992-08-01
Abstract
Abstract A self-cleaning gas-fired oven having a power burner beneath the oven cooking cavity so the flue gases pass up through the cooking cavity and exit through an oven exhaust means at the top rear of the oven. A counterflow heat exchanger rising from the oven exhaust means, and an air collector means at the bottom of the heat exchanger to convey the preheated cooling air to the power burner by means of a motor-blower unit. The heat exchanger is of special design with cylindrical flue gas tubes so the opposite wall plates operate at relatively cool temperatures.
Inventors
- 👤 B Hurko
- 👤 R Dills
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 07:07
CPC Classifications
F; F24; F24C; F24C14/00; F24C14/02; F24C14/025
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
183 words
A gas oven comprising a substantially box-like oven liner having a front opening, and an oven door cooperating with the opening for defining an oven cooking cavity, a fire box located beneath the oven liner, gas burner means positioned in the fire box, flue gas inlet openings in the bottom wall of the oven liner for passing the flue gases into the cooking cavity, oven exhaust means positioned adjacent the back of the oven liner near the top thereof, and a counterflow heat exchanger at the back of the oven rising up from the oven exhaust means, the heat exchanger having both flue gas vent means and ambient air inlet means at the top of the heat exchanger so that the ambient air extracts much of the heat from the flue gases as they pass through the heat exchanger, and a collector means attached to the bottom of the heat exchanger and communicating with the burner means so that the ambient air flowing down through the heat exchanger becomes heated and passes to the gas burner means as preheated air to support combustion.
Claim 2
Dependent Claim
183 words
A gas oven comprising a substantially box-like oven liner having a front opening, and an oven door cooperating with the opening for defining an oven cooking cavity, a fire box located beneath the oven liner, gas burner means positioned in the fire box, flue gas inlet openings in the bottom wall of the oven liner for passing the flue gases into the cooking cavity, oven exhaust means positioned adjacent the back of the oven liner near the top thereof, and a counterflow heat exchanger at the back of the oven rising up from the oven exhaust means, the heat exchanger having both flue gas vent means and ambient air inlet means at the top of the heat exchanger so that the ambient air extracts much of the heat from the flue gases as they pass through the heat exchanger, and a collector means attached to the bottom of the heat exchanger and communicating with the burner means so that the ambient air flowing down through the heat exchanger becomes heated and passes to the gas burner means as preheated air to support combustion.
Claim 3
Dependent Claim
121 words
A gas oven as recited in claim 1 wherein the said counterflow heat exchanger comprises a collapsed corrugated sheet metal panel forming a generally flat closed wall plate with a plurality of vertical spaced cylindrical flue gas tubes on the innermost side of the wall plate, and a generally flat wall plate held across the cylindrical tubes thereby forming alternate cooling air channels between the gas tubes, whereby the flue gases are adapted to pass by convection up the cylindrical tubes and the ambient air is adapted to pass down through the cooling air channels, whereby the outer wall plates operate at relatively cool temperatures during the operation of the heat exchanger as compared with the temperature of the flue gases.
Claim 4
Dependent Claim
68 words
A gas oven as recited in claim 2 wherein the said gas burner means is furnished with a compressed air supply means for supplying fresh combustion air to the burner means, said air supply means being connected to the said air collector means beneath the heat exchanger to draw the ambient air down through the heat exchanger as preheated air before delivering it to the gas burner means.
Claim 5
Dependent Claim
29 words
A gas oven as recited in claim 3 wherein the said air supply means is a centrifugal motor-blower unit located adjacent the gas burner means beneath the oven liner.
Claim 6
Dependent Claim
180 words
A pyrolytic self-cleaning gas-fired oven comprising wall means defining an oven cooking cavity, a bake burner at the bottom of the oven cavity, an exhaust flue in the said wall means adjacent the upper rear of the cavity for discharging flue gases from said oven cavity, and a counterflow heat exchanger rising up from the exhaust flue and loCated generally above the oven cooking cavity so as to create a strong natural draft up through the heat exchanger and avoid the necessity of a circulation fan, and an oven control panel located in front of the heat exchanger, an air inlet means adjacent the top of the heat exchanger, air collector means behind the oven joined to the bottom portion of the heat exchanger and open to the bake burner means to furnish preheated air to the burner to improve the efficiency of combustion, the top of the heat exchanger having flue gas vent means directed outwardly away from the back of the oven with cooling means in conjunction with a warming shelf to serve as a secondary heat exchanger.
Claim 7
Dependent Claim
180 words
A pyrolytic self-cleaning gas-fired oven comprising wall means defining an oven cooking cavity, a bake burner at the bottom of the oven cavity, an exhaust flue in the said wall means adjacent the upper rear of the cavity for discharging flue gases from said oven cavity, and a counterflow heat exchanger rising up from the exhaust flue and loCated generally above the oven cooking cavity so as to create a strong natural draft up through the heat exchanger and avoid the necessity of a circulation fan, and an oven control panel located in front of the heat exchanger, an air inlet means adjacent the top of the heat exchanger, air collector means behind the oven joined to the bottom portion of the heat exchanger and open to the bake burner means to furnish preheated air to the burner to improve the efficiency of combustion, the top of the heat exchanger having flue gas vent means directed outwardly away from the back of the oven with cooling means in conjunction with a warming shelf to serve as a secondary heat exchanger.
Claim 8
Dependent Claim
69 words
A pyrolytic self-cleaning gas-fired oven as recited in claim 5 wherein the said bake burner means is a powered burner that is furnished with a forced air supply means, the said air collector means from the bottom of the heat exchanger being connected to the forced air supply means, so that the air is both drawn down the heat exchanger and compressed and then supplied to the burner means.
Claim 9
Dependent Claim
173 words
A flow-through, self-cleaning gas-fired oven comprising an oven cooking cavity formed by a box-like oven liner and a front opening access door, a bake burner located beneath the bottom wall of the oven liner, flue gas inlet openings in the said bottom wall for passing the flue gases into the cooking cavity, oven exhaust means adjacent the top rear of the oven liner, and a counterflow heat exchanger with vertically arranged flue gas tubes and alternate cooling air channels extending for substantially the width of the oven liner, the flue gas tubes being connected at the bottom to the said oven exhaust means and having flue gas vent means adjacent the top of the heat exchanger that are directed away from the back of the oven, the air channels having inlet means adjacent the top of the heat exchanger, and an air collector means mounted on the bottom portion of the heat exchanger and joined to the cooling air channels and cooperating with the bake burner to supply preheated air to support combustion.
Claim 10
Dependent Claim
173 words
A flow-through, self-cleaning gas-fired oven comprising an oven cooking cavity formed by a box-like oven liner and a front opening access door, a bake burner located beneath the bottom wall of the oven liner, flue gas inlet openings in the said bottom wall for passing the flue gases into the cooking cavity, oven exhaust means adjacent the top rear of the oven liner, and a counterflow heat exchanger with vertically arranged flue gas tubes and alternate cooling air channels extending for substantially the width of the oven liner, the flue gas tubes being connected at the bottom to the said oven exhaust means and having flue gas vent means adjacent the top of the heat exchanger that are directed away from the back of the oven, the air channels having inlet means adjacent the top of the heat exchanger, and an air collector means mounted on the bottom portion of the heat exchanger and joined to the cooling air channels and cooperating with the bake burner to supply preheated air to support combustion.
Claim 11
Dependent Claim
100 words
A flow-through, self-cleaning gas-fired oven as recited in claim 7 wherein the said bake burner is a power burner that is furnished with a motor-blower means interposed between the air collector means and the power burner to both accelerate the velocity of the air cooling means passing down through the heat exchanger and compress this preheated air before delivering it to the power burner so as to improve the efficiency of combustion and thereby lower the amount of heat energy needed to cook as well as to decompose the food soil lodged on the walls forming the oven cooking cavity.
Claim 12
Dependent Claim
104 words
A flow-through, self-cleaning gas-fired oven as recited in claim 7 wherein the said counterflow heat exchanger comprises a collapsed corrugated sheet metal panel forming a generally flat closed wall plate with a plurality of spaced cylindrical flue gas tubes on the innermost side of the wall plate, and a generally flat wall plate held across the cylindrical tubes with a generally line contact with each, thereby forming alternate cooling air channels between the gas tubes, whereby the exterior walls of the heat exchanger operate at relatively cool temperatures during the operation of the heat exchanger as compared with the temperature of the flue gases.
Claim 13
Dependent Claim
100 words
A flow-through, self-cleaning gas-fired oven as recited in claim 9 wherein the said bake burner is a power burner that is furnished with a motor-blower means interposed between the air collector means and the power burner to both accelerate the velocity of the air cooling means passing down through the heat exchanger and compress this preheated air before delivering it to the power burner so as to improve the efficiency of combustion and thereby lower the amount of heat energy needed to cook as well as to decompose the food soil lodged on the walls forming the oven cooking cavity.
References Cited (Backward Citations)
US3205884A
Cited
US3590805A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-01-07 | 1977-07-09 | 1978-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-07 | 1981-07-09 | 1982-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-07 | 1985-07-09 | 1986-01-08 | $7700.00 | Window Closed / Lapsed |