EP0526768A2 - Gasbeheizter Ofen mit erzwungener Konvektion - Google Patents

Gasbeheizter Ofen mit erzwungener Konvektion Download PDF

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Publication number
EP0526768A2
EP0526768A2 EP92111870A EP92111870A EP0526768A2 EP 0526768 A2 EP0526768 A2 EP 0526768A2 EP 92111870 A EP92111870 A EP 92111870A EP 92111870 A EP92111870 A EP 92111870A EP 0526768 A2 EP0526768 A2 EP 0526768A2
Authority
EP
European Patent Office
Prior art keywords
gas
oven
tubular conduit
cooking cavity
flue gases
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.)
Granted
Application number
EP92111870A
Other languages
English (en)
French (fr)
Other versions
EP0526768A3 (en
EP0526768B1 (de
Inventor
Claudio Del Fabbro
Franco Tassan Mangina
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.)
Electrolux Zanussi Grandi Impianti SpA
Original Assignee
Zanussi Grandi Impianti SpA
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.)
Filing date
Publication date
Application filed by Zanussi Grandi Impianti SpA filed Critical Zanussi Grandi Impianti SpA
Publication of EP0526768A2 publication Critical patent/EP0526768A2/de
Publication of EP0526768A3 publication Critical patent/EP0526768A3/en
Application granted granted Critical
Publication of EP0526768B1 publication Critical patent/EP0526768B1/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

Definitions

  • the present invention relates to a gas-heated oven for cooking food under the action of forced hot air circulation and the possible presence of steam in the cooking cavity of the same oven.
  • Gas heated ovens with forced hot-air convection for cooking food arranged inside a tightly sealed cooking cavity are known from the prior art, said ovens being further arranged to also cook the food through the action of steam that is generated in an appropriately provided, separate boiler and is then delivered into said cooking cavity through appropriately provided connection pipings.
  • these ovens essentially comprise a motor-driven fan and an arrangement of heating elements that are mounted against the back wall of said cooking cavity so as to bring about a flow of hot air through the same cooking cavity, said heating elements consisting of a plurality of parallel pipes extending over the whole height of the cooking cavity, through which the hot flue gases generated by a gas-fuelled atmospheric burner of the traditional type that is housed in a position underneath said cooking cavity.
  • Said pipes are so shaped as to include semi-circular portions located in close proximity of the outer profile of the blades of the wheel of said motor-driven fan, as well as two vertical, rectilinear portions that flow into the afore cited semi-circular portions and are respectively connected with the oven cooking cavity, which is located therebeneath and houses said gas-fuelled burner, and a flue exhaust riser provided in the upper portion of said cooking cavity.
  • ovens of the above described kind enable cooking of food to be performed in two different manners, ie. by roasting the food when the oven is set to operate so as to cook by forced hot-air circulation only, or by 'boiling' the food when said oven is set to operate so as to also cook by injecting steam into the cooking cavity.
  • Such an excessive heating up of said pipes and said sheet-metal sections causes in particular the whole metal structure of the cooking cavity of the oven to be subject to considerable thermal expansion effects, and may furthermore rapidly lead to conditions jeopardizing the mechanical strength and integrity of the materials which said pipes and said sheet-metal sections are made of, with the possibility for the cooking cavity itself to undergo strain, deformation and structural impairments as a result thereof.
  • the particular physical arrangement of the burner in the oven does not allow for more cooking ovens of this kind to be mounted upon each other in a multi-tier arrangement in the case that tight space reasons would make such an arrangement most advisable.
  • a further drawback of this kind of cooking ovens lies in the fact that they usually require the use of burners which are clearly oversized in comparison with the heat power rating that is actually required for food cooking purposes, since only a part of the thermal energy in the flue gases is in this case used to heat up the air circulated inside the cooking cavity of the ovens owing to the fact that said flue gases flow through the heat-exchanger pipes at a quite high rate, so that they are still relatively hot when they leave the heat-exchanger pipes, and that the same heat-exchanger pipes form a relatively limited heat-exchange surface area inside the cooking cavity.
  • a gas-heated cooking oven 3 is described in the following, said oven being capable of being used in a preferred way in professional kitchens of such institutional catering establishments as hospitals, nursing homes, canteens, hotels, restaurants, etc.
  • such an oven comprises a metal muffle 4 having a box-like shape, open on its front side, and delimiting internally the cooking cavity 5 of the oven, and it further comprises an outer metal enclosure 6, which has also a box-like shape, is larger in its size than the afore cited muffle and encloses said muffle so as to define hollow spaces all around it, in which corresponding mats or plates 7 of insulating material of a traditional type are inserted.
  • the cooking oven according to the present invention further comprises a separate, thermally insulated door 8 provided to close the afore cited open front side of the muffle 4, said door being hinged on one side to said outer enclosure 6 and being further sized so as it is adapted to tightly fit and abut against a corresponding sealing gasket 9 attached along the whole perimetral rim of the front opening 10 in said outer enclosure 6, thereby shutting the cooking cavity 5 of the oven in a tightly sealed way.
  • a fan means 11 of a traditional type is mounted, the driving shaft 12 of which is arranged to pass through an opening 13 provided in the back wall of the outer enclosure 6 and can be rotatably driven by an electric motor 14 of a traditional type which is supported against the outer surface of said back wall.
  • said fan means 11 to promote cooking of the food placed in the cooking cavity 5 of the oven by forced convection, ie. by bringing about a mechanical circulation of the air heated by at least an appropriate heat-exchanger arrangement 15 mounted inside said cooking cavity and consisting of a tubular conduit wound in a spiral-like way around said fan means 11 so as to form a sequence of coils having preferably a circular shape.
  • Said tubular conduit is in particular provided at its ends with corresponding rectilinear, horizontal portions 16 and 17, of which portions the portion 16 is communicating with a box-like portion 18 that is attached externally on one of its sides against the outer enclosure 6 of the oven, and forms a plenum chamber in which a gas burner 19 is housed, whereas the other portion 17 goes out horizontally towards the lateral side of the oven, thereby defining a rectilinear, horizontal portion 20.
  • the afore cited tubular conduit is furthermore provided with a central portions 21 that is shaped in the form of a spiral with such a bending radius as to enable said central portion to be fittingly arranged all around said fan means 11, at a relatively small distance from the outer contour of the wheel of said fan means.
  • Said tubular conduit 15 is mounted in the cooking oven according to the present invention by first introducing and placing it in position inside the cooking cavity 5, and then inserting its ends through corresponding openings that are provided in the side wall 27 of the oven, in such a way as to have said tubular conduit fixed to that side wall by means of the flanges 24, 25 that are integrally fitted on said rectilinear, horizontal portions 17 and 16 of the conduit and are to be connected with said rectilinear, horizontal portions 20 and said plenum chamber 18. respectively (see Figure 1).
  • an enclosed space 22 is in turn provided, which is attached laterally to the same wall of the oven and is adapted to accomodate: a steam generator means 33, the plenum chamber 18. a fan means 26 and the various control and regulation devices (not shown) required in connection with said fan means.
  • the gas burner 19 arranged in the combustion chamber 18 is in a preferred way of a torch-like type (see Figure 3) and consists of a Venturi pipe 34 that, after a 90- degree bend, connects into a rectilinear pipe portions 35, in the surface of which a plurality of perforations 36 are provided, distributed all over its circumference according to a regular patterns.
  • Said perforated pipe portion 35 is in turn enclosed externally by a further pipe portion 37 which builds with said first pipe portion 35 a hollow cavity 38 that is sealed, on one of its ends, by the wall 39 connected with said further pipe portion 37.
  • said burner 19 is connected in a per se known way with the gas supply conduit 23 which is terminated by the provision of an injector 40 that is coincident with and located in close proximity of the inlet port 41 of said Venturi pipe 34.
  • the cylindrical head 42 of the burner 19, as defined by said pipe portion 37, is arranged so as to fall coaxially with and be turned towards the rectilinear portion 16 of said tubular conduit 15, so that the flue gas resulting from the combustion, and used to heating purposes, are allowed to circulate through said tubular conduit.
  • the combustion chamber 18 is connected to communicate with the delivery side 43 of the fan means 26 which, when the burner is operating, ensures the delivery of the correct amount of air required for complete combustion and further promotes the forced circulation of the flue gases through said tubular conduit 15 and causes the same flue gases to be then exhausted through the horizontal portion 20 of said tubular conduit.
  • said fan means 26 which takes in the air from said enclosed space 22, creates inside the afore cited plenum chamber 18 the overpressure condition which is required to overcome all kinds of flow-dynamic resistances that flue gases may be likely to encounter when flowing through the whole length of said heat-exchanger arrangement.
  • the jet of gas delivered by said injector 40 and directed into said Venturi pipe 34 causes a certain amount of primary air to be admitted into the same Venturi pipe 34 (in the direction shown by the arrow E), so that it is capable of pre-mixing with the gas, thereby forming an air-gas mixture that flows towards the outlet port 44 of the cylindrical head 42 of the burner 19, where it is ignited so as to start combustion and give rise to the flame.
  • the resulting cooking oven according to the present invention is further provided with a plane partition wall 28 arranged inside the cooking cavity 5 of the oven (see Figure 2), said partition wall being applied in front of the fan means 11 and the coils of said tubular conduit 15 so as to delimitate, within said cooking cavity, a separate chamber 29 having a limited volume and enclosing said fan means and said tubular conduit.
  • said partition wall 28 is sized so as it extends over almost the whole width of the cooking cavity 5, thereby defining corresponding apertures 30 and 31 at its sides for allowing the hot air to pass through in the direction indicated by the arrows D. It is further provided with a central aperture 32 with its edge folded towards said separate chamber 29, in correspondence of the wheel of said fan means 11, to the purpose of enabling said fan means to take in the air to be subsequently heated up and circulated inside the cooking cavity of the oven.
  • the afore illustrated cooking oven according to the present invention can be also arranged to cook food by means of steam injection into said cooking cavity 5, said steam being generated in a per se known manner in the afore cited steam generator which in a preferred way consists of a separate boiler 33 provided in said enclosed space 22 and connected with said cooking cavity 5.
  • the presence of the fan means 26 in correspondence of the inlet port of said tubular conduit 15 enables a forced circulation of the flue gases through the same tubular conduit to be brought about in a very effective way. Furthermore, the efficiency at which the resulting heat-exchange process takes place between the flue gases and the air in the cooking cavity of the oven can be additionally enhanced through the provision, in the terminal portion 17 of said tubular conduit 15, of at least a swirl baffle (47) of a per se known shape, provided to create turbulent flow and consisting for instance in a plane sheet-metal strip 48 (see Figure 4), which is inserted in the tubular conduit 15 and in which regularly spaced rectangular apertures 48a are provided, having rectangular cut-away portions 49 which are bent, for instance orthogonally with respect to said plane sheet-metal strip 48 and alternately projecting from the opposite sides thereof, so as to define in this way a labyrinth flow path for a part of the flue gases circulating in the tubular conduit 15 to flow through according to a
  • a first advantage of this tubular conduit lies in the fact that it is very simple in its construction, so that it is capable of being mounted and assembled in the oven in a very simple and quick way, as well as capable of being reached in a appropriately convenient way for cleaning and other periodical maintenance purposes.
  • said tubular conduit 15 is capable of freely expanding under the influence of the various operating temperatures of the oven, whereas it avoids transmitting such thermal expansion effects on to the other walls of the oven owing to both the particular spiral-like configuration of said tubular conduit and the fact that it is only and solely supported in correspondence of a single wall of the oven, so that it has no physical contact with any other wall of the same oven.
  • the fact that the burner is arranged laterally with respect to the oven and the flue gas exhaust is provided at the side of the oven outer enclosure means that there is the possibility for two or more ovens of this kind to be stacked whenever space considerations make this necessary or appropriate.
  • the gas-heated cooking oven according to the present invention can quite quickly and simply be converted into an electrically heated oven by removing the tubular conduit 15 from its mounting position in the oven and replacing it with a corresponding spiral-like coiled electric heating element of a traditional type, which is to be mounted in the oven according to the same criteria and with the same methods as previously described.
  • the above described cooking oven according to the invention may be the subject of any such modification as considered to be appropriate, such as for instance by giving said tubular conduit 15 a different geometric shape that would anyway ensure an efficient forced circulation of flue gases through said conduit, or by providing said plenum chamber 18 with a different type of burner, without departing from the scopes of the invention.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Baking, Grill, Roasting (AREA)
  • Commercial Cooking Devices (AREA)
EP92111870A 1991-08-05 1992-07-13 Gasbeheizter Ofen mit erzwungener Konvektion Expired - Lifetime EP0526768B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITPN910054A IT1253697B (it) 1991-08-05 1991-08-05 Forno di cottura a gas a convezione forzata.
ITPN910054 1991-08-05

Publications (3)

Publication Number Publication Date
EP0526768A2 true EP0526768A2 (de) 1993-02-10
EP0526768A3 EP0526768A3 (en) 1993-03-24
EP0526768B1 EP0526768B1 (de) 1994-11-23

Family

ID=11394572

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92111870A Expired - Lifetime EP0526768B1 (de) 1991-08-05 1992-07-13 Gasbeheizter Ofen mit erzwungener Konvektion

Country Status (4)

Country Link
EP (1) EP0526768B1 (de)
DE (1) DE69200704T2 (de)
ES (1) ES2067984T3 (de)
IT (1) IT1253697B (de)

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2710401A1 (fr) * 1993-09-22 1995-03-31 Rosinox Four à gaz à brassage d'air chaud.
EP0698768A1 (de) * 1994-06-22 1996-02-28 ZANUSSI GRANDI IMPIANTI S.p.A. Kombinierter Gas- und Mikrowellenkochherd mit Vorrichtung zum Kochen mit Dampf
DE19708231A1 (de) * 1997-01-30 1998-08-06 Rational Gmbh Wärmetauschereinrichtung
US5915372A (en) * 1997-01-30 1999-06-29 Rational Gmbh Heat exchanger
EP0954969A2 (de) * 1998-05-06 1999-11-10 Werner & Pfleiderer Lebensmitteltechnik GmbH Heizregister mit Wirbelblechen
NL1014044C2 (nl) 2000-01-10 2001-07-19 Levens Group B V Door gasbrander verwarmde oven.
US6311685B1 (en) * 1999-11-30 2001-11-06 Angelo Po Grandi Cucine S.P.A. Heat exchanger for ovens for food cooking
EP1176367A1 (de) * 2000-07-25 2002-01-30 Gierre Srl Zwangskonvektionsofen zum Backen von Nahrungsmitteln
WO2003040626A1 (en) * 2001-09-21 2003-05-15 Wayne/Scott Fetzer Company Convection oven with gas burner
EP1321720A1 (de) * 2001-12-20 2003-06-25 Convotherm Elektrogeräte GmbH Wärmetauschereinrichtung
EP1340945A1 (de) * 2002-03-01 2003-09-03 eloma GmbH Grossküchentechnik Gerät zum Behandeln und Zubereiten von Nahrungsmitteln mit gasbefeuerter Heizung sowie Wärmetauschereinrichtung für ein derartiges Gerät
EP1424008A3 (de) * 2002-11-28 2005-07-13 Gierre Srl Umluftofen mit einem Radialflammenbrenner
WO2005066549A1 (en) * 2003-12-30 2005-07-21 Arcelik Anonim Sirketi An owen
US7017571B2 (en) 2003-06-18 2006-03-28 Convotherm Elektrogeräte GmbH Heat exchanger device
DE102008058718A1 (de) * 2008-11-24 2010-05-27 Rational Ag Gargerät mit Wärmetauscher
ITVE20110067A1 (it) * 2011-10-06 2013-04-07 Foinox S P A Scambiatore di calore per apparecchi di cottura a gas.
ITTV20120158A1 (it) * 2012-08-06 2014-02-07 Gico Spa Forno per cottura di alimenti a convezione o a convezione e vapore alimentato a gas.
US9372005B2 (en) 2012-11-30 2016-06-21 Alto-Shaam, Inc. Heat exchanger for oven
US12031727B2 (en) 2021-03-05 2024-07-09 Electrolux Home Products, Inc. Oven bake heating channel exchange system

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102927594B (zh) * 2012-11-11 2015-02-11 湖南宏大锅炉设备有限公司 多功能高温高效节能蒸汽炉灶
CN107361308A (zh) * 2017-07-11 2017-11-21 中国农业科学院农产品加工研究所 烤鸭的红外蒸汽烤制方法
US20240164564A1 (en) * 2022-11-22 2024-05-23 Alto-Shaam, Inc. Gas Heat Exchanger with Baffle for a Combination Oven

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3428330A1 (de) * 1983-08-04 1985-02-21 Helmut Dipl.-Ing. Graz König Backofen
EP0344743A2 (de) * 1988-06-01 1989-12-06 ZANUSSI GRANDI IMPIANTI S.p.A. Umluft- Gaskochherd
EP0415035A1 (de) * 1989-09-01 1991-03-06 ZANUSSI GRANDI IMPIANTI S.p.A. Kochherd

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3428330A1 (de) * 1983-08-04 1985-02-21 Helmut Dipl.-Ing. Graz König Backofen
EP0344743A2 (de) * 1988-06-01 1989-12-06 ZANUSSI GRANDI IMPIANTI S.p.A. Umluft- Gaskochherd
EP0415035A1 (de) * 1989-09-01 1991-03-06 ZANUSSI GRANDI IMPIANTI S.p.A. Kochherd

Cited By (24)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2710401A1 (fr) * 1993-09-22 1995-03-31 Rosinox Four à gaz à brassage d'air chaud.
EP0698768A1 (de) * 1994-06-22 1996-02-28 ZANUSSI GRANDI IMPIANTI S.p.A. Kombinierter Gas- und Mikrowellenkochherd mit Vorrichtung zum Kochen mit Dampf
DE19708231A1 (de) * 1997-01-30 1998-08-06 Rational Gmbh Wärmetauschereinrichtung
DE19708231C2 (de) * 1997-01-30 1999-03-25 Rational Gmbh Wärmetauschereinrichtung für eine Vorrichtung zur Wärmebehandlung von Speisen
US5915372A (en) * 1997-01-30 1999-06-29 Rational Gmbh Heat exchanger
EP0856705B1 (de) * 1997-01-30 2002-02-20 Rational AG Wärmetauschereinrichtung
EP0954969A2 (de) * 1998-05-06 1999-11-10 Werner & Pfleiderer Lebensmitteltechnik GmbH Heizregister mit Wirbelblechen
US6121582A (en) * 1998-05-06 2000-09-19 Werner & Pfleiderer Lebensmitteltechnik Gmbh Heating elements with swirl vanes
EP0954969A3 (de) * 1998-05-06 2002-05-15 Werner & Pfleiderer Lebensmitteltechnik GmbH Heizregister mit Wirbelblechen
US6311685B1 (en) * 1999-11-30 2001-11-06 Angelo Po Grandi Cucine S.P.A. Heat exchanger for ovens for food cooking
NL1014044C2 (nl) 2000-01-10 2001-07-19 Levens Group B V Door gasbrander verwarmde oven.
EP1176367A1 (de) * 2000-07-25 2002-01-30 Gierre Srl Zwangskonvektionsofen zum Backen von Nahrungsmitteln
WO2003040626A1 (en) * 2001-09-21 2003-05-15 Wayne/Scott Fetzer Company Convection oven with gas burner
EP1321720A1 (de) * 2001-12-20 2003-06-25 Convotherm Elektrogeräte GmbH Wärmetauschereinrichtung
EP1340945A1 (de) * 2002-03-01 2003-09-03 eloma GmbH Grossküchentechnik Gerät zum Behandeln und Zubereiten von Nahrungsmitteln mit gasbefeuerter Heizung sowie Wärmetauschereinrichtung für ein derartiges Gerät
US7325480B2 (en) 2002-03-01 2008-02-05 Eloma Gmbh Grosskuchentechnik Apparatus for treating and preparing food by gas-fired heating and a heat exchange device for such an apparatus
EP1424008A3 (de) * 2002-11-28 2005-07-13 Gierre Srl Umluftofen mit einem Radialflammenbrenner
US7017571B2 (en) 2003-06-18 2006-03-28 Convotherm Elektrogeräte GmbH Heat exchanger device
WO2005066549A1 (en) * 2003-12-30 2005-07-21 Arcelik Anonim Sirketi An owen
DE102008058718A1 (de) * 2008-11-24 2010-05-27 Rational Ag Gargerät mit Wärmetauscher
ITVE20110067A1 (it) * 2011-10-06 2013-04-07 Foinox S P A Scambiatore di calore per apparecchi di cottura a gas.
ITTV20120158A1 (it) * 2012-08-06 2014-02-07 Gico Spa Forno per cottura di alimenti a convezione o a convezione e vapore alimentato a gas.
US9372005B2 (en) 2012-11-30 2016-06-21 Alto-Shaam, Inc. Heat exchanger for oven
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
ITPN910054A0 (it) 1991-08-05
ES2067984T3 (es) 1995-04-01
IT1253697B (it) 1995-08-22
DE69200704T2 (de) 1995-03-30
EP0526768A3 (en) 1993-03-24
ITPN910054A1 (it) 1993-02-05
EP0526768B1 (de) 1994-11-23
DE69200704D1 (de) 1995-01-05

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