US3590803A - Food-treatment apparatus with gas-circulating means - Google Patents

Food-treatment apparatus with gas-circulating means Download PDF

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Publication number
US3590803A
US3590803A US836742A US3590803DA US3590803A US 3590803 A US3590803 A US 3590803A US 836742 A US836742 A US 836742A US 3590803D A US3590803D A US 3590803DA US 3590803 A US3590803 A US 3590803A
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United States
Prior art keywords
food
housing
conduit
blower
chamber
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Expired - Lifetime
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US836742A
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English (en)
Inventor
Paul Sauer
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Burger Eisenwerke AG
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Burger Eisenwerke AG
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
    • F24C15/00—Details
    • F24C15/32—Arrangements of ducts for hot gases, e.g. in or around baking ovens
    • F24C15/322—Arrangements of ducts for hot gases, e.g. in or around baking ovens with forced circulation

Definitions

  • an axiahinput radiahoutput blower for circulating air in [5 llthe housing through the chamber Heat is drawn from an ex- F24: 15/32 tcmal gas burner through a conduit which opens in the hous- [50] Field of Search 126/19, 21, ing adjacent the axia] input f the blower Sli htl upstream f 21 v 39 C, 273 this conduit (in the recirculation path) is an exhaust conduit of variable cross-sectional area out through which heated air [56] References cued can flow.
  • the food-treatment chamber is downstream of the UNITED STATES PATENTS mouth of the heat-input conduit and upstream of the exhaust 3,384,068 5/1968 Perry et al. 126/21 A conduit.
  • the present invention relates to a food-treatment apparatus, and, more particularly, to an oven for cooking foodstuffs.
  • Ovens having a closedhousing in which a blower creates a path of heater air through a food-treatment chamber are known as described in my commonly assigned applications Ser. No. 778,123 and Ser. No. 778,269 both filed Nov. 22, 1968 and respectively entitled FOOD-TREATMENT AP- PARATUS WITH WASHING MEANS” and FOOD TREATMENT APPARATUS WITH DEVAPORIZING MEANS.”
  • Such ovens have electric coils mounted adjacent the radial output of the blower to heat the air used for cooking. It has now been found that such a heating arrangement is disadvantageous for several reasons. One of these reasons is that electricity is a relatively expensive commodity when used for generation of heat. In addition, a shock hazard is present in ovens so equipped. Furthermore it often requires conversion of a great amount of energy into heat, with large losses, to heat the ovens adequately.
  • an object of the present invention is to provide improved heating means for such an apparatus.
  • heating means comprising a gas burner external of the housing.
  • the hot gases generated by this burner are drawn up through a conduit which has a mouth open horizontally toward the axial input of the blower used for circulating hot air within the housing.
  • a second conduit opens upstream of the first conduit and extends upwardly out of the housing to allow some of the depleted recirculated air to be discharged, thereby controlling the proportion of fresh hot air mixed with the recirculating mixture.
  • the food-treatment chamber is located in the path of the circulated air downstream of the mouth of the input conduit and upstream of the exhaust conduit.
  • means-4n this case simple flapsis provided to vary the effective cross section of the outlet conduits to control heating of comestibles in the treatment chamber. This value is advantageously coupled to a thermostat.
  • FIG. 1 is a vertical section through a food-treatment apparatus according to the present invention
  • FIG. 2 is a section taken along line lI-II of FIG. I;
  • FIG. 3 is a section similar to FIG. 1 showing an alternative food-treatment apparatus according to the present invention.
  • a food-treatment apparatus for the warming, thawing, and cooking (roasting or baking) of food has a housing 15 and a food-treatment chamber 5 therein.
  • a blower 3 with an axial input 30 and a radial output 3b is mounted on a wall 9 in the housing and powered by a motor 8 between this partition wall 9 and an end wall 10 of the housing 15.
  • the food-treatment chamber 5 has walls 13, two of which are provided with rails 14 on which shelves 19 (one shown) carrying the foodstuffs 20 can be held.
  • the walls 13 are pierced at 15 and spaced from the interior of the housing by perforated plates 21 and 24 supported on spacers l6.
  • the housing 15 is provided with a door 17 hinged at 18 to open to the side.
  • a conical hood ll diverges horizontally out ward from the input 30 of the blower 3 toward the chamber 5 so that an air-circulation path is formed that extends out from the outputs 3b, in through the sides and far end of the chamber 5, out through the end of the chamber 5 near the blower 3, in through the hood I] and into the input 34.
  • a gas burner 1 connected through a valve 26 to a source (not shown) of combustible fuel (cooking) gas.
  • a vertical conduit 2 directly above this burner 1 has a mouth 20 which opens horizontally into the axial intake 3a of the blower 3. In this manner air heated by the burner l flows up through the conduit 2 and into the input 3a.
  • the cross section of the conduit 2 is so calculated that the blower does not interfere with burning ofthe burner l.
  • the leading, open end of the hood 11 serves as one end of an exhaust conduit 4 which leads vertically upward out of the housing 15.
  • the cross-sectional area of the exhaust conduit 4 is greater than that of the heating conduit 2.
  • the exhaust conduit 4 is to the right, and therefore downstream, of the heating conduit 2 with the chamber 5 in the circulating path between them.
  • a thermostat 6 under the compartment 5 is coupled via servomotors 7 and 22 to dampers or flaps 12 and 23 in the conduits 4 and 2 respectively and to the solenoid-actuated valve 26 in the line leading to the burner 1. This makes a fine control of the oven possible.
  • FIG. 3 shows another embodiment wherein similar reference numerals are used for similar elements.
  • a partition wall 31 forms a chamber 30 in the housing 30 with holes (not shown) allowing air to flow between the two.
  • a spray device 32 injects cold water into the chamber 30 to precipitate out steam in the circulating air. This precipitate is drawn off at 33 as described in my above-cited application Ser. No. 778,269.
  • annular nozzle 27 directs a circular jet of cleaning fluid into the hood 11 to spread cleaning fluid all through the oven when desired. This fluid is poured into a cup 28 prior to distribution. The cleaning operation is ideally carried out only with the valve 26 and dampers l2 and 23 closed. This system operates as described in my above-cited application Ser. No. 778,123.
  • a food-treatment apparatus comprising:
  • housing means defining a food-treatment chamber
  • air-circulating means including a blower in said housing means and having an input side and an output side for displacing air along a closed circulation path passing through said chamber;
  • conduit means opening at said input side of said blower for introducing the heated gas into said path
  • said heating means including a fuel burner generating a hot exhaust gas conducted to said blower by said conduit means, said burner being a gas burner disposed externally of said housing means and opening into said conduit means
  • said air-circulation means a funnel-shaped member converging centrally away from said chamber and defining within said funnel-shaped member a return path for recirculated gases and around said funnel-shaped member a duct for supplying hot gas to said chamber
  • said blower is provided with an axial intake at said input side communicating with the interior of said funnel-shaped member and a radial outlet communicating with said duct, and a motor for driving said blower axially remote from said funnelshaped member
  • said housing means including a partition isolating said motor from said duct
  • said conduit means including an upwardly extending conduit rising from a floor of said housing means in a vertical stretch and having a horizontal stretch opening in the direction of said intake within said funnel-shaped member, said horizontal
  • air-circulating means in said housing for displacing air along a closed circling path through said food-treatment chamber and around the means for supporting the food therein and including a funnel-shaped air-guide member opening and widening toward said supporting means over substantially an entire side thereof and converging into said further chamber;
  • an axial-intake blower mounted on said partition and having its intake registering with the interior of said member at its narrow mouth, and an output discharge around the exterior of said member in a closed circling path tranversing said food-treatment chamber;
  • the apparatus defined in 'claim 4 further comprising a discharge conduit extending upwardly from said housing and opening adjacent the wide mouth of said member, and control means for varying the flow cross section of said discharge conduit.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Electric Ovens (AREA)
  • Baking, Grill, Roasting (AREA)
US836742A 1968-07-20 1969-06-26 Food-treatment apparatus with gas-circulating means Expired - Lifetime US3590803A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEB0076543 1968-07-20

Publications (1)

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US3590803A true US3590803A (en) 1971-07-06

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US836742A Expired - Lifetime US3590803A (en) 1968-07-20 1969-06-26 Food-treatment apparatus with gas-circulating means

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US (1) US3590803A (enrdf_load_stackoverflow)
GB (1) GB1239496A (enrdf_load_stackoverflow)
NL (1) NL6908455A (enrdf_load_stackoverflow)

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3698377A (en) * 1971-05-07 1972-10-17 Hoover Co Gas-fired forced convection ovens
US3812837A (en) * 1973-01-17 1974-05-28 Rinnai Kk Cooking oven
US3973551A (en) * 1972-11-03 1976-08-10 The Tappan Company Powered circulation oven
US4471750A (en) * 1982-05-19 1984-09-18 Mastermatic, Inc. Tunnel heater
US4648377A (en) * 1986-05-01 1987-03-10 Hobart Corporation Gas convection oven and heat exchanger therefor
USD306064S (en) 1988-03-11 1990-02-13 Zephyr Convection Cooking Systems Co. Convection blower or similar article for use in an electric oven
US5016606A (en) * 1989-08-31 1991-05-21 Gas Research Institute Gas-fired oven
US5165889A (en) * 1989-05-19 1992-11-24 Import-Export Research And Development, Inc. Gas convection oven with heat exchanger and baffles
US5385137A (en) * 1993-10-21 1995-01-31 The Lucks Company U-tube heat exchanger for bakery ovens
US20030044312A1 (en) * 2001-08-31 2003-03-06 Motoharu Takano Pressure heating method and pressure heating apparatus
US6564792B2 (en) * 2001-02-28 2003-05-20 Angelo Po Grandi Cucine S.P.A. Device for de-humidifying a cooking chamber in an apparatus for food cooking
FR2839546A1 (fr) * 2002-05-07 2003-11-14 Premark Feg Llc Four pour la cuisson d'aliments
US20060046222A1 (en) * 2004-08-31 2006-03-02 Seco/Warwick Corporation Apparatus for uniform flow distribution of gas in processing equipment
US20140144423A1 (en) * 2012-11-27 2014-05-29 Jeahyuk Wie Gas oven range
US20150072603A1 (en) * 2012-03-30 2015-03-12 Oxford Optronix Limited Controlled Atmosphere Workstation
US12031727B2 (en) 2021-03-05 2024-07-09 Electrolux Home Products, Inc. Oven bake heating channel exchange system

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3639771A1 (de) * 1986-11-21 1988-06-01 Lechmetall Landsberg Gmbh Vorrichtung zur waermebehandlung von speisen mit einem flachwaermetauscher
DE4124742C2 (de) * 1991-07-25 1994-06-09 Eloma Gmbh Gargerät, insbesondere für stückiges Gargut

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB742248A (en) * 1952-05-29 1955-12-21 Whitworths Holdings Ltd Improvements relating to ovens and drying apparatus
US3384068A (en) * 1966-12-09 1968-05-21 American Gas Ass Gas oven system

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB742248A (en) * 1952-05-29 1955-12-21 Whitworths Holdings Ltd Improvements relating to ovens and drying apparatus
US3384068A (en) * 1966-12-09 1968-05-21 American Gas Ass Gas oven system

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
Carrier, German App. No. 1,142,804, Pub. 1/1963, Class 126/21A. *

Cited By (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3698377A (en) * 1971-05-07 1972-10-17 Hoover Co Gas-fired forced convection ovens
US3973551A (en) * 1972-11-03 1976-08-10 The Tappan Company Powered circulation oven
US3812837A (en) * 1973-01-17 1974-05-28 Rinnai Kk Cooking oven
US4471750A (en) * 1982-05-19 1984-09-18 Mastermatic, Inc. Tunnel heater
US4648377A (en) * 1986-05-01 1987-03-10 Hobart Corporation Gas convection oven and heat exchanger therefor
USD306064S (en) 1988-03-11 1990-02-13 Zephyr Convection Cooking Systems Co. Convection blower or similar article for use in an electric oven
US5165889A (en) * 1989-05-19 1992-11-24 Import-Export Research And Development, Inc. Gas convection oven with heat exchanger and baffles
US5016606A (en) * 1989-08-31 1991-05-21 Gas Research Institute Gas-fired oven
US5385137A (en) * 1993-10-21 1995-01-31 The Lucks Company U-tube heat exchanger for bakery ovens
US6564792B2 (en) * 2001-02-28 2003-05-20 Angelo Po Grandi Cucine S.P.A. Device for de-humidifying a cooking chamber in an apparatus for food cooking
US20030044312A1 (en) * 2001-08-31 2003-03-06 Motoharu Takano Pressure heating method and pressure heating apparatus
EP1287751A3 (en) * 2001-08-31 2003-10-22 Motoharu Takano Pressure heating method and pressure heating apparatus
FR2839546A1 (fr) * 2002-05-07 2003-11-14 Premark Feg Llc Four pour la cuisson d'aliments
WO2003098117A1 (fr) * 2002-05-07 2003-11-27 Premark Feg L.L.C. Four pour la cuisson d'aliments
US20050188982A1 (en) * 2002-05-07 2005-09-01 Premark Feg L.L.C. Food cooking oven
AU2003260541B2 (en) * 2002-05-07 2006-08-24 Premark Feg L.L.C. Food cooking oven
US20060046222A1 (en) * 2004-08-31 2006-03-02 Seco/Warwick Corporation Apparatus for uniform flow distribution of gas in processing equipment
US7037106B2 (en) 2004-08-31 2006-05-02 Seco/Warwick Corporation Apparatus for uniform flow distribution of gas in processing equipment
US20150072603A1 (en) * 2012-03-30 2015-03-12 Oxford Optronix Limited Controlled Atmosphere Workstation
US20140144423A1 (en) * 2012-11-27 2014-05-29 Jeahyuk Wie Gas oven range
US9488377B2 (en) * 2012-11-27 2016-11-08 Lg Electronics Inc. Gas oven range
US12031727B2 (en) 2021-03-05 2024-07-09 Electrolux Home Products, Inc. Oven bake heating channel exchange system

Also Published As

Publication number Publication date
NL6908455A (enrdf_load_stackoverflow) 1970-01-22
GB1239496A (enrdf_load_stackoverflow) 1971-07-14

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