EP1412677B1 - Direktkonvektionsofen - Google Patents

Direktkonvektionsofen Download PDF

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Publication number
EP1412677B1
EP1412677B1 EP02774848A EP02774848A EP1412677B1 EP 1412677 B1 EP1412677 B1 EP 1412677B1 EP 02774848 A EP02774848 A EP 02774848A EP 02774848 A EP02774848 A EP 02774848A EP 1412677 B1 EP1412677 B1 EP 1412677B1
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EP
European Patent Office
Prior art keywords
turbine
convection
air
muffle
food
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP02774848A
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English (en)
French (fr)
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EP1412677A1 (de
Inventor
Laurent Personnettaz
Raymond Violi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Societe Cooperative de Production Bourgeois SCOP
Original Assignee
Societe Cooperative de Production Bourgeois SCOP
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by Societe Cooperative de Production Bourgeois SCOP filed Critical Societe Cooperative de Production Bourgeois SCOP
Publication of EP1412677A1 publication Critical patent/EP1412677A1/de
Application granted granted Critical
Publication of EP1412677B1 publication Critical patent/EP1412677B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • 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
    • F24C15/325—Arrangements of ducts for hot gases, e.g. in or around baking ovens with forced circulation electrically-heated

Definitions

  • the present invention relates to ovens for cooking food, and more particularly to convection ovens used in community kitchens.
  • Convection ovens for cooking food generally comprise a metal muffle surrounding an interior muffle cavity, with a bottom wall forming a floor, an upper wall forming a ceiling, and four vertical peripheral walls. At least one of the peripheral walls is provided with an access door for the introduction and extraction of food to be cooked in the interior cavity of the muffle.
  • the convection of air is provided by a convection turbine, urged in rotation by a motor, and disposed generally in the vicinity of the furnace. one of the peripheral walls which has no access door.
  • the turbine is rotatably mounted on an axis of rotation perpendicular to the peripheral wall.
  • Heating means can advantageously be placed in the air flow, upstream or downstream of the turbine, and be adapted to heat the air circulating in the muffle under the impulse of the turbine, favoring the cooking of food .
  • the inner cavity of the muffle is divided into two compartments: a cooking compartment, accessible by the door, and shaped to receive the food to be cooked; a heating compartment, including the turbine of convection and heating means such as electric resistors or gas burners.
  • the cooking compartment is always isolated from the heating compartment by a box or a partition wall, generally perpendicular to the axis of rotation of the turbine, and comprising a few air passage holes.
  • the partition wall has a double effect of channeling the air circuit powered by the turbine, and protection of the heating compartment relative to projections of grease or other material from food during cooking. Indeed, in known furnaces, a constant concern is to prevent projections from food during cooking to contaminate the elements that are inside the heating compartment, namely the turbine, the heating means and the various sensors to control these elements.
  • Another problem encountered in known cooking ovens for food is the difficulty in ensuring a regular cooking of all the food contained in the oven, regardless of their position in the cooking compartment. It can be seen that the cooking of food can be very different depending on the position of the food in the cooking compartment. Some areas of the cooking compartment may overheat food, while other areas produce insufficient heat. Also, the cooking distribution is modified according to the type of food to be cooked, and according to the quantities of food introduced into the cooking compartment.
  • the present invention is intended in particular to avoid the disadvantages of known convection oven structures for cooking food, aiming to promote the cleaning or self-cleaning of the oven and to ensure a better baking distribution.
  • the invention results from the surprising observation that the deletion of the partition wall between the cooking compartment and the heating compartment, combined with a direction of rotation of the turbine axially sucking the air to repress it in the vicinity of the peripheral walls , ensures both a self-cleaning effect of the oven and a better cooking distribution.
  • the convection turbine and the heating means are placed in the interior cavity of the muffle in direct communication with the cooking volume, without a partition wall opposing the air flow, with a protective grid shaped and interposed between the convection turbine and the cooking volume to prohibit the contact of a User's hand with rotating turbine blades of convection.
  • the relatively cold air is drawn in an enlarged axial suction zone occupied by the food to be cooked, and that the hot discharge air is confined to the vicinity of the peripheral walls, away from the food to be cooked. .
  • the heating means comprise annular electrical resistances placed at the periphery of the convection turbine.
  • the heating means comprise a gas burner placed axially in the suction of the convection turbine, or placed radially at the periphery of the convection turbine.
  • the turbine may advantageously be a generally cylindrical structure, with a posterior flange carrying a plurality of short frontal blades distributed at the periphery.
  • the diameter of the turbine may advantageously be greater than one third of the largest dimension of the adjacent peripheral wall.
  • a good air circulation in the oven can be obtained by providing a tray support frame, removable and can pass through the oven door, and constituted by amounts connected by cross members to form a perforated parallelepipedal structure leaving a free circulation of air and carrying side rails perpendicular to the door to slidably receive and support horizontal trays on which can be arranged food to be cooked.
  • the cleaning of the oven is very easy, and it is found that the projections of food from the food to be cooked do not remain on the turbine or the heating means, and are evacuated immediately by the air flow to the lower wall of floor . This results in a self-cleaning effect of the oven.
  • the cleaning can be further improved by providing a cleaning device by spraying water into the muffle.
  • a cleaning device by spraying water into the muffle.
  • the cleaning device Due to the absence of a partition wall, the cleaning device has an immediate cleaning action both on the cooking compartment and on the turbine and the heating means.
  • a convection oven comprises a muffle 1, having an inner cavity 8 generally parallelepiped limited by a bottom wall of floor 2, by a upper wall of ceiling 3, by two opposite lateral peripheral walls 4 and 5, by an anterior peripheral wall 6 and by a posterior peripheral wall 7.
  • the anterior peripheral wall 6 is provided with an access door for the introduction and extraction of food to be cooked in the inner cavity 8 of the muffle.
  • the inner faces of the walls of the muffle are generally smooth, to avoid catching and retaining food particles likely to detach from food to cook.
  • a convection turbine 9 is urged in rotation by a motor 10 powered by an external source of electrical energy.
  • the convection turbine 9 is of the centrifugal action type, drawing the air axially through its center and displacing the air radially by its periphery. It includes for that inclined blades, known and usual manner.
  • the convection turbine 9 is disposed near the center of a peripheral wall without an access door. In the embodiment illustrated, the convection turbine 9 is disposed near the center of the rear peripheral wall 7 of the muffle.
  • an oven with two doors in opposition to each other formed respectively in the anterior peripheral wall 6 and in the posterior peripheral wall 7, with the turbine placed in the vicinity of one of the opposite side peripheral walls 4 or 5 of the oven.
  • the convection turbine 9 is rotatably mounted on an axis of rotation 11 perpendicular to the rear peripheral wall 7 to which it is adjacent.
  • the convection turbine 9 sucks the air axially towards the center of the posterior peripheral wall 7 and delivers the air radially towards the edges of the posterior peripheral wall 7.
  • Heating means are placed in the air circulation upstream or downstream of the turbine, and are adapted to heat the air circulating in the muffle under the impulse of the convection turbine 9.
  • the heating means comprise annular electric resistances 12 and 13, placed at the periphery of the convection turbine 9, and supplied by an external source of electrical energy to which they are connected by supply conductors 15.
  • the electrical resistances Annular 12 and 13 are thus placed downstream of the convection turbine 9 in the air flow.
  • the heating means comprise a gas burner 14 placed axially in the suction of the convection turbine 9.
  • the other means of the embodiment of the Figures 1 to 3 identified by the same numerical references.
  • the gas burner 14 is directed towards the rear wall 7 of the furnace, that is to say toward the center of the turbine 9. It is fed by a supply pipe 16. Its central portion is traversed by a duct. evacuation of flue gas 17.
  • a cooking volume 81 is reserved in the interior cavity 8 of the muffle for receiving the food to be cooked, and there is provided a simple removable tray support frame, adapted to penetrate the muffle by the door provided in the anterior peripheral wall 6.
  • the tray support frame consists of uprights connected by upper rails to form a structure generally parallelepiped openwork leaving a free flow of air in the oven.
  • the tray support frame structure carries lateral rails, for example in the form of U-shaped profiles, perpendicular to the anterior peripheral wall 6, and shaped to slidably receive and support the lateral edges of horizontal trays on which food can be arranged. to cook.
  • the convection turbine 9 and the heating means 12, 13 or 14 are placed in the muffle 1 in direct communication with the cooking volume 81, without partition wall opposing the flow of air.
  • the mechanical protection grid 22 is of cylindrical closed and enveloping shape, with a cylindrical peripheral portion 23 and a flat front portion 24.
  • the mechanical protection grid 22 has mesh sufficiently large not to disturb the flow of air to or from the convection turbine 9, and mesh sufficiently tight to prevent their passage through the fingers of a user.
  • the size of the mesh may for example be chosen in a range of values of about 2 x 2 mm to 8 x 8 mm. It is advantageous to choose a mesh of approximately 4 ⁇ 4 mm.
  • the front portion 24 of the mechanical protection grid 22 carries, in its central zone, a filter 29 or mesh finer mesh, promoting a smooth flow of air around the gas burner 14 for stabilization of the flame.
  • a convection turbine 9 with a generally cylindrical structure, with a disc-shaped rear flange 25 carrying a plurality of short, peripherally distributed short-edge blades 26.
  • the diameter D of the convection turbine 9 is preferably greater than one third of the largest dimension (width or height) of the adjacent posterior peripheral wall 7.
  • the convection turbine 9 comprises at least twelve front blades 26 having a radial dimension less than one-tenth of its diameter D.
  • the opposite direction is defined relative to the orientation of the blades 26: on the figures 2 and 5 it is seen that the blades 26 are inclined to the left with respect to their corresponding radial direction C; by this orientation, the blades produce an effective centrifugal thrust of the air when the turbine rotates in the direction of clockwise; the opposite direction is in this case the opposite direction of the clockwise.
  • a cleaning device 27 by spraying water in the muffle 1.
  • the cleaning device 27 may comprise a horizontal cup placed adjacent to the center of the upper ceiling wall 3, with central water supply means for producing a flow of water towards the periphery of the cup parallel to the upper wall of the dish. 3.
  • the water is projected radially around the periphery of the dish, preferably when the oven is still relatively hot, and the water then flows on all the peripheral walls of the furnace and on the convection turbine 9 and the heating means.
  • the particular structure of the oven according to the invention also allows correct operation in a mixed oven, that is to say in the presence of steam in the cooking chamber generated by an integrated steam generator.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Baking, Grill, Roasting (AREA)
  • Electric Ovens (AREA)
  • Crystals, And After-Treatments Of Crystals (AREA)
  • Fats And Perfumes (AREA)
  • Superconductors And Manufacturing Methods Therefor (AREA)
  • Harvester Elements (AREA)

Claims (11)

  1. Konvektionsofen zum Kochen von Speisen mit:
    - einer Muffel (1) mit einem generell parallelepiped-förmigen, inneren Hohlraum (8), der durch eine untere Bodenwand (2), durch eine obere Deckwand (3) und durch vier Seitenwände (4, 5, 6, 7) begrenzt ist, wobei mindestens eine der Seitenwände (6) mit einer Zugangsöffnung für das Einführen und das Entnehmen von im inneren Hohlraum (8) der Muffel (1) zu kochenden Speisen versehen ist,
    - ein durch einen Motor (10) drehangetriebenes Konvektionsmittel (9), das in dem inneren Hohlraum (8) der Muffel (1) benachbart zur Mitte einer anliegende Seitenwand (7), die nicht mit der Zugangsöffnung versehen ist, angebracht ist, das drehbar um eine Drehachse (11) senkrecht zur benachbarten Seitenwand (7) montiert ist, und zum Zirkulierenlassen von Luft im inneren Hohlraum (8) der Muffel (1) angeordnet ist,
    - Heizmitteln (12, 13, 14), die in der Zirkulation von Luft stromaufwärts oder stromabwärts der Konvektionsmittel (9) angeordnet sind und zum Erwärmen von Luft, die in der Muffel (1) unter Antrieb der Konvektionsmittel (9) zum Kochen der Speisen zirkuliert, ausgebildet sind,
    - ein Kochvolumen (81), das in dem inneren Hohlraum (8) der Muffel (1) zur Aufnahme der zu kochenden Speisen reserviert ist,
    - wobei die Konvektionsmittel eine Konvektions-Zentrifugen-Turbine (9) enthalten, die zum Ansaugen von Luft axial in Richtung zum Zentrum der benachbarten Seitenwand (7) angeordnet ist und um sie in Richtung zu den Rändern der benachbarten Seitenwand (7) radial zu verdrängen,
    dadurch gekennzeichnet, daß :
    - die Konvektionsturbine (9) und die Heizmittel (12, 13, 14) im inneren Hohlraum (8) der Muffel (1) in direkter Kommunikation mit dem Kochvolumen (81) angeordnet sind, ohne eine Trennwand, die die Luftzirkulation leitet und die sich Spritzern von Fett oder anderen Materialien, die von den Speisen während des Kochens stammen, entgegensetzt,
    - ein mechanisches Schutzgitter (22) zwischen der Konvektionsturbine (9) und das Kochvolumen (81) eingepaßt und zwischengesetzt ist, um einen Durchtritt von Fingern eines Benutzers zu unterbinden, ohne die Zirkulation von Luft zur oder von der Konvektionsturbine (9) zu behindern.
  2. Ofen nach Anspruch 1, dadurch gekennzeichnet, daß die Heizmittel elektrische ringförmige Widerstände (12, 13) enthalten, die um den Umfang der Konvektionsturbine (9) angeordnet sind.
  3. Ofen nach Anspruch 1, dadurch gekennzeichnet, daß die Heizmittel einen Gasbrenner (14) aufweisen, der axial im Ansaugbereich der Konvektionsturbine (9) oder radial um den Umfang der Konvektionsturbine (9) angeordnet ist.
  4. Ofen nach irgendeinem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß die Konvektionsturbine (9) generell eine zylindrische Struktur hat, mit einem hinteren Flansch (25), der eine Vielzahl von kurzen frontalen Schaufeln (26) trägt, die in Umfangsrichtung verteilt sind.
  5. Ofen nach Anspruch 4, dadurch gekennzeichnet, daß der Durchmesser (D) der Konvektionsturbine (9) größer ist als ein Drittel der Größenabmessung der benachbarten Seitenwand (7).
  6. Ofen nach einem der Ansprüche 4 oder 5, dadurch gekennzeichnet, daß die Konvektionsturbine (9) mindestens zwölf Schaufeln (26) aufweist, deren radiale Abmessung kleiner ist als ein Zehntel ihres Durchmessers (D).
  7. Ofen nach irgendeinem der Ansprüche 4 bis 6, dadurch gekennzeichnet, daß die frontalen Schaufeln der Turbine (9) in Bezug auf ihre radiale Richtung (C) geneigt sind.
  8. Ofen nach irgendeinem der Ansprüche 1 bis 7, dadurch gekennzeichnet, daß er einen Stützrahmen für Tabletts aufweist, der durch Ständer gebildet ist, die durch obere Traversen befestigt sind, um eine offene parallelepiped-förmige Struktur zu bilden, die eine freie Zirkulation von Luft zuläßt und seitliche Gleitbahnen trägt, die rechtwinklig zur vorderen Seitenwand (6) stehen, zur gleitenden Aufnahme und zum Stützen von seitlichen Rändern von horizontalen Tabletts, auf denen die zu kochenden Speisen angeordnet sein können.
  9. Ofen nach irgendeinem der Ansprüche 1 bis 8, dadurch gekennzeichnet, daß er eine Reinigungseinrichtung (27) aufweist zum Sprühen von Wasser in die Muffel (1).
  10. Ofen nach Anspruch 9, dadurch gekennzeichnet, daß die Reinigungseinrichtung (27) eine horizontale Schale enthält, die in der Nähe der oberen Deckwand (3) angeordnet ist und zentrale Mittel zur Zufuhr von Wasser zum Erzeugen einer Strömung von Wasser in Richtung zum Umfang der Schale parallel zur oberen Deckwand (3).
  11. Verwendung eines Ofens nach Anspruch 7, dadurch gekennzeichnet, daß der Motor (10) zum Drehantreiben der Turbine (9) in der Richtung wo die Ausrichtung der Schaufeln die Luft in Richtung zur Achse der Turbine treibt, was einen reduzierten zentrifugalen Antrieb auf die Luft bewirkt.
EP02774848A 2001-07-31 2002-07-29 Direktkonvektionsofen Expired - Lifetime EP1412677B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR0110415 2001-07-31
FR0110415A FR2828269B1 (fr) 2001-07-31 2001-07-31 Four a convexion directe
PCT/FR2002/002707 WO2003012342A1 (fr) 2001-07-31 2002-07-29 Four a convexion directe

Publications (2)

Publication Number Publication Date
EP1412677A1 EP1412677A1 (de) 2004-04-28
EP1412677B1 true EP1412677B1 (de) 2008-08-13

Family

ID=8866254

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02774848A Expired - Lifetime EP1412677B1 (de) 2001-07-31 2002-07-29 Direktkonvektionsofen

Country Status (8)

Country Link
US (1) US7044122B2 (de)
EP (1) EP1412677B1 (de)
AT (1) ATE404826T1 (de)
DE (1) DE60228260D1 (de)
ES (1) ES2312627T3 (de)
FR (1) FR2828269B1 (de)
PT (1) PT1412677E (de)
WO (1) WO2003012342A1 (de)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2897419A1 (fr) * 2006-02-13 2007-08-17 Bourgeois Prod Coop Four a convexion a fonction grill
EP2500662B1 (de) * 2008-01-28 2017-03-15 Duke Manufacturing Company Konvektionsofen
EP2452128A2 (de) 2009-07-09 2012-05-16 BSH Bosch und Siemens Hausgeräte GmbH Dampfgargerätevorrichtung
CN106352336B (zh) * 2016-10-31 2018-05-01 河北凯德采暖设备有限公司 一种节能环保燃气灶
CN112890578A (zh) 2017-08-09 2021-06-04 沙克忍者运营有限责任公司 烹饪系统
US11045047B2 (en) 2017-11-10 2021-06-29 Ron's Enterprises, Inc. Variable capacity oven
CN212788226U (zh) * 2019-02-25 2021-03-26 沙克忍者运营有限责任公司 烹饪系统
US11051654B2 (en) 2019-02-25 2021-07-06 Sharkninja Operating Llc Cooking device and components thereof
CN110447668A (zh) * 2019-07-24 2019-11-15 广州复雅机械设备有限公司 一种二次热交换式隧道炉
US11134808B2 (en) 2020-03-30 2021-10-05 Sharkninja Operating Llc Cooking device and components thereof
CN216535005U (zh) 2020-04-06 2022-05-17 沙克忍者运营有限责任公司 烹饪系统

Citations (2)

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Publication number Priority date Publication date Assignee Title
GB1417199A (en) * 1971-11-22 1975-12-10 Bauknecht Gmbh G Method and apparatus for cooking meat
US4648377A (en) * 1986-05-01 1987-03-10 Hobart Corporation Gas convection oven and heat exchanger therefor

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US4369760A (en) * 1980-09-22 1983-01-25 Northland Aluminum Products, Inc. Portable oven air circulator
FR2548764B1 (fr) * 1983-07-05 1988-01-08 Scholtes Ets Eugen Four electrique a usage menager
US5655511A (en) * 1992-02-10 1997-08-12 Southbend-A. Middleby Company Gas fired convection oven
US5287253A (en) * 1993-03-25 1994-02-15 Blorstad Kurt T Combined light and fan assembly
US5497760A (en) * 1994-10-17 1996-03-12 G. S. Blodgett Corporation Convection oven with power induced back draft flow
US5601070A (en) * 1996-06-17 1997-02-11 Middleby Marshall, Inc. Convection oven
DE19730610C1 (de) * 1997-07-17 1998-10-22 Wiesheu Gmbh Ofen zur Wärmebehandlung von Lebensmitteln und Verfahren zum Reinigen des Innenraums
US6114664A (en) * 1998-07-08 2000-09-05 Amana Company, L.P. Oven with combined convection and low mass, high power density heating

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1417199A (en) * 1971-11-22 1975-12-10 Bauknecht Gmbh G Method and apparatus for cooking meat
US4648377A (en) * 1986-05-01 1987-03-10 Hobart Corporation Gas convection oven and heat exchanger therefor

Also Published As

Publication number Publication date
PT1412677E (pt) 2008-11-24
FR2828269A1 (fr) 2003-02-07
ATE404826T1 (de) 2008-08-15
WO2003012342A8 (fr) 2004-04-22
US20040216731A1 (en) 2004-11-04
EP1412677A1 (de) 2004-04-28
ES2312627T3 (es) 2009-03-01
DE60228260D1 (de) 2008-09-25
US7044122B2 (en) 2006-05-16
FR2828269B1 (fr) 2005-03-25
WO2003012342A1 (fr) 2003-02-13

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