EP0277888B1 - Four à vapeur au gaz - Google Patents

Four à vapeur au gaz Download PDF

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Publication number
EP0277888B1
EP0277888B1 EP88420006A EP88420006A EP0277888B1 EP 0277888 B1 EP0277888 B1 EP 0277888B1 EP 88420006 A EP88420006 A EP 88420006A EP 88420006 A EP88420006 A EP 88420006A EP 0277888 B1 EP0277888 B1 EP 0277888B1
Authority
EP
European Patent Office
Prior art keywords
burner
gas
enclosure
oven
steam
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
EP88420006A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0277888A1 (fr
Inventor
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.)
Filing date
Publication date
Application filed by Societe Cooperative de Production Bourgeois SCOP filed Critical Societe Cooperative de Production Bourgeois SCOP
Publication of EP0277888A1 publication Critical patent/EP0277888A1/fr
Application granted granted Critical
Publication of EP0277888B1 publication Critical patent/EP0277888B1/fr
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
    • F24C15/327—Arrangements of ducts for hot gases, e.g. in or around baking ovens with forced circulation with air moisturising

Definitions

  • the present invention relates to steam ovens, in particular for cooking and communities.
  • Convection ovens and direct gas heating have been known for a few years, comprising an oven enclosure intended to contain the materials to be heated, and at least one gas burner placed inside the enclosure.
  • a turbine for mixing the atmosphere inside the enclosure, driven by an electric motor, ensures internal convection.
  • a flue gas evacuation pipe connects the interior of the enclosure with the outside atmosphere.
  • An intermediate pipe connects the gas burner to an external equipment comprising an air booster and means for producing and introducing into the intermediate pipe an appropriate mixture of air and gas, the air leaving the booster, and the gas coming from a gas inlet pipe. Having the burner inside the enclosure ensures a very rapid heating up of the oven which, associated with the forced convection provided by the turbine, allows very rapid heating of the materials contained in the oven.
  • DE-A-2 050 159 describes a direct gas-fired oven comprising a gas burner placed outside the oven enclosure.
  • the object of the present invention is in particular to avoid the drawbacks of known ovens, by proposing a new oven structure which simultaneously uses the technique of direct gas heating and the technique of heating with water vapor contained in the enclosure;
  • the combination of these two techniques presents significant difficulties, in that the burner operates intermittently to ensure temperature regulation; it has been found that, during the periods when the burner does not operate, water vapor tends to condense on the walls of the burner, and water tends to penetrate the inlet pipes of air-gas mixture, risking compromising the re-ignition of the burner.
  • the present invention solves this problem by providing means enabling the burner to be relighted for sure, and preventing the penetration of water into the air-gas mixture inlet pipe.
  • the operation of the burner is ensured with great security, and in particular the risks of explosion or ignition of air-gas mixture inside the inlet pipe are avoided. of this mixture.
  • the oven comprises a safety device detecting the presence of a flame at the burner, and an ignition device producing a spark for the ignition of the burner.
  • These devices include electrodes connected to an electrical control and measurement device.
  • Another object of the present invention is to ensure reliable operation of the electrodes in a humid atmosphere, in particular avoiding the formation of significant condensation on the electrodes, condensation which would risk compromising the re-ignition of the burner and the reliability of the monitoring.
  • the means for preventing the penetration of steam into the intermediate pipe are constituted by the air blower, supplied with electrical energy, and producing a circulation of air in the intermediate pipe and in the burner during gas burnout periods.
  • the heating means for keeping the burner at temperature advantageously comprise an auxiliary source of heat, producing a heating of the burner, for example an electrical resistance, or a gas pilot.
  • the auxiliary heat source produces the heating of the air during its passage through the intermediate pipe; the air thus heated and circulating in the intermediate pipe and the burner heats the burner, and simultaneously prevents the condensation of vapor in the burner and on the burner monitoring and ignition electrodes.
  • the auxiliary heat source acts directly on the burner by conduction, the air circulating in the intermediate pipe being heated on passage through the burner and ensuring the drying of the electrodes.
  • Figure 1 shows a schematic side view in section of an oven according to the present invention.
  • FIG. 2 shows in perspective an exploded view of the external equipment for supplying air-gas mixture according to the invention.
  • the oven according to the invention comprises an oven enclosure 1 intended to contain the materials to be heated, at least one gas burner 2 placed in a rear part 9 of the interior 3 of the enclosure 1, a turbine 4 for mixing the atmosphere inside the enclosure.
  • the turbine 4 is rotated by an electric motor 5 powered by the sector.
  • a pipe 6 for evacuating the burnt gases is connected inside 3 of the enclosure 1 to the upper rear part of the enclosure, as shown in the figure.
  • the pipe connects the enclosure 1 of the oven to the outside atmosphere, and preferably outside the room in which the oven is contained.
  • the front face of the enclosure 1 of the oven has an opening which can be closed by a door 7 for the passage of the materials to be introduced into the oven and to be removed after heating.
  • the materials are placed in an anterior part 8 of the enclosure 1, separated from the posterior part 9 by a grid 10 preventing the projection of grease on the burner 2 and the turbine 4.
  • Deflectors channel the circulation of air and steam inside the oven, circulation produced by the turbine 4.
  • External equipment 11 supplies the burner 2 with an appropriate air-gas mixture.
  • An intermediate pipe 12 connects the burner 2 and the external equipment 11.
  • the air intended to be mixed with the gas is taken by the external equipment 11 from the ambient atmosphere of the room through an air inlet filter 14.
  • a steam generator 15 for example a generator of known type, produces water vapor and sends it to the oven enclosure 1 by a pipe 16 for supplying steam.
  • the pipe 16 brings the steam to two points of the enclosure 1, arranged in the upper part of the enclosure and laterally on either side of the middle of the enclosure.
  • FIG. 2 There is shown in Figure 2 the various bodies constituting the external equipment 11.
  • the intermediate pipe 12 the end 20 of which is intended to be connected to the burner 2
  • the gas inlet pipe 13 whose l end 21 is intended to be connected to an external gas inlet pipe.
  • the gas inlet pipe 13 comprises two solenoid valves 22, controlled by an electrical control device 23, ensuring the establishment or interruption of the gas inlet.
  • the gas passes through a calibrated injector 24 which introduces it inside the intermediate pipe 12, at a pressure and a flow rate suitable for mixing with air.
  • a pressure sensor 27 detects the presence of compressed air at the outlet of the booster 25, and is connected to the control device 23.
  • auxiliary heat source 17 for example an electrical resistance supplied by an external source of electrical energy and controlled by the control device 23, or for example a gas pilot light supplied permanently by an auxiliary gas pipe.
  • air circulation is further ensured through the intermediate pipe 12, by operation of the booster 25 during the periods in which the burner 2 is off; during these periods of interruption of combustion, the circulation of gas is interrupted by the solenoid valves 22, while air continues to circulate in the intermediate pipe 12 by the action of the booster 25.
  • the auxiliary heat source 17 can be arranged in an intermediate position in the intermediate pipe 12, to produce the heating of the air flowing through the intermediate pipe 12 during the periods of combustion interruption in the burner 2 .
  • a shutter valve 18 is provided, interposed in the intermediate pipe 12 in the vicinity of the burner 2.
  • the intermediate pipe area 12 between the valve 18 and the burner 2 is subjected to the action of the auxiliary heat source 17 maintaining the assembly at a temperature higher than the condensation temperature of water vapor in the enclosure.
  • the valve 18 is controlled by the control device 23 causing it to open during the operation of the burner 2, and its closing during the combustion stops in the burner 2. In this embodiment, it is not necessary to permanently maintain air circulation in the intermediate pipeline.
  • the oven according to the invention is designed to operate according to three successive operating modes, at the operator's choice: a convection mode, a steam mode, and a convection and steam mode.
  • the oven operates in the same way as a convection oven and direct gas heating: the motor 5 drives the turbine 4 and ensures the mixing of the interior atmosphere of the oven enclosure; the burner 2 ensures the combustion of an air-gas mixture produced by the external equipment 11; line 6 evacuates the burnt gases.
  • the steam generator 15 is stopped.
  • the temperature regulation inside the oven enclosure is ensured by the control device 23 which receives temperature information from a temperature sensor not shown in the figures, causes the solenoid valves 22 to open or close. to ensure alternative periods of combustion and of stopping of combustion in the burner 2, and controls the operation of a gas ignition electrode at the level of the burner 2, electrode identical to those of the usual direct-heating gas ovens .
  • the solenoid valves 22 interrupt the introduction of gas, while the booster 25 ensures air circulation through the intermediate pipe 12.
  • the auxiliary heat source 17 maintains the burner 2 at a temperature higher than the condensation temperature of water vapor in the enclosure.
  • the steam generator 15 produces water vapor and introduces it into the enclosure 1 of the oven through the pipe 16.
  • the motor 5 drives the turbine 4 in rotation to stir the atmosphere inside the enclosure;
  • the control device 23 controls the solenoid valves 22 and the ignition electrode to ensure intermittent periods of combustion of the gas in the burner 2 to maintain the oven at a desired temperature;
  • the steam generator 15 introduced into the enclosure of the oven with steam.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Regulation And Control Of Combustion (AREA)
  • Gas Burners (AREA)
EP88420006A 1987-01-08 1988-01-06 Four à vapeur au gaz Expired - Lifetime EP0277888B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8700413A FR2609532B1 (fr) 1987-01-08 1987-01-08 Four a vapeur au gaz
FR8700413 1987-01-08

Publications (2)

Publication Number Publication Date
EP0277888A1 EP0277888A1 (fr) 1988-08-10
EP0277888B1 true EP0277888B1 (fr) 1991-01-02

Family

ID=9346946

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88420006A Expired - Lifetime EP0277888B1 (fr) 1987-01-08 1988-01-06 Four à vapeur au gaz

Country Status (5)

Country Link
US (1) US4823766A (es)
EP (1) EP0277888B1 (es)
DE (1) DE3861325D1 (es)
ES (1) ES2019470B3 (es)
FR (1) FR2609532B1 (es)

Families Citing this family (36)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2650061B1 (fr) * 1989-07-19 1991-11-15 Gaz De France Four perfectionne fonctionnant a la vapeur et/ou au gaz
US5014679A (en) * 1989-09-18 1991-05-14 Tecogen, Inc. Gas fired combination convection-steam oven
US5243962A (en) * 1990-01-26 1993-09-14 Stein, Inc. Cooking oven for slow-cooking of food products
IT1258073B (it) * 1992-04-29 1996-02-20 Zanussi Elettromecc Dispositivo di misura dell'umidita' per forni, in particolare forni dicottura di alimenti
US5368008A (en) * 1992-10-09 1994-11-29 Delaware Capital Formation, Inc. Steamer apparatus
FR2701090B1 (fr) * 1993-01-29 1995-04-07 Bourgeois Ste Coop Prod Four à vapeur à chauffage direct au gaz.
IT1265578B1 (it) * 1993-11-04 1996-11-22 Zanussi Grandi Impianti Spa Forno di cottura dotato di dispositivi perfezionati di pulitura automatica
AT401113B (de) * 1994-01-26 1996-06-25 Vaillant Gmbh Verfahren zum kondensatfreien betreiben eines umlaufwasserheizers
GB2286455B (en) * 1994-02-10 1998-01-14 Stoves Plc Improvements in and relating to gaseous fuel burner assemblies and to appliances incorporating such burner assemblies
IT1268279B1 (it) * 1994-07-29 1997-02-27 Polin & C Spa Ing Forno di cottura, in particolare per pane o prodotti di pasticceria
IT1267582B1 (it) * 1994-09-09 1997-02-07 Zanussi Grandi Impianti Spa Forno dotato di dispositivo perfezionato di misura dell'umidita'
ES2114782B1 (es) * 1994-12-21 1999-03-01 Fagor S Coop Horno de cocinado comercial a gas combinado.
US5515773A (en) * 1995-02-16 1996-05-14 The Rival Company Steam oven
US5732614A (en) * 1996-05-20 1998-03-31 Delaware Capital Formation, Inc. Food processing apparatus
DE59701287D1 (de) * 1997-12-23 2000-04-20 Eloma Gmbh Groskuechentechnik Verfahren zum Entfeuchten eines Garraumes eines Dampfgargerätes sowie Vorrichtung hierfür
DE19824172A1 (de) * 1998-05-29 1999-12-09 Rational Gmbh Gargerät mit Energiespeicher- und Energieentnahmesystem
DE10060155A1 (de) * 2000-12-04 2002-06-20 Bsh Bosch Siemens Hausgeraete Gargerät
WO2003058125A1 (en) * 2001-12-28 2003-07-17 Sharp Kabushiki Kaisha Heating cooking device
US6837234B2 (en) * 2002-05-03 2005-01-04 Premark Feg L.L.C. Oven heat exchanger and floor construction
DE10233340B4 (de) * 2002-07-23 2004-07-15 Rational Ag Porenbrenner sowie Gargerät, enthaltend mindestens einen Porenbrenner
DE10236961B4 (de) * 2002-08-13 2004-07-22 Rational Ag Brennersystem, insbesondere für ein Gargerät und Verfahren zum Betrieb desselben
US6894252B2 (en) * 2003-04-10 2005-05-17 Premark Feg L.L.C. Dough proofing apparatus and related methods
US6854457B2 (en) 2003-04-15 2005-02-15 Premark Feg L.L.C. Convection oven and related cooking air flow system
US7975604B2 (en) * 2003-05-16 2011-07-12 Premark Feg L.L.C. Dough proofing apparatus and related methods
US20040187700A1 (en) * 2003-06-09 2004-09-30 Tippmann Robert T. Method and apparatus for accelerating steam in a steam oven
ES2287836T3 (es) * 2005-04-29 2007-12-16 MKN MASCHINENFABRIK KURT NEUBAUER GMBH & CO. Aparato de cocinado con una salida del recinto de cocinado y un sifon.
US7527051B2 (en) * 2005-05-02 2009-05-05 Premark Feg L.L.C. Oven and associated floor construction
US20070267018A1 (en) * 2006-05-19 2007-11-22 Lang Manufacturing Company Enhanced convection heat-treatment system and method
US8753703B2 (en) * 2008-10-24 2014-06-17 John Bean Technologies Corporation Continuous process for cooking bacon with improved recovery
US9066523B2 (en) * 2009-01-19 2015-06-30 Accutemp Products, Inc. Method and apparatus for directing steam distribution in a steam cooker
US10856694B1 (en) 2011-09-27 2020-12-08 Crescent Metal Products, Inc. Indoor/outdoor hot cabinet
KR101428870B1 (ko) * 2012-11-27 2014-08-14 엘지전자 주식회사 가스 오븐 레인지
US9204661B2 (en) * 2013-01-18 2015-12-08 Illionois Tool Works Inc. Rack oven with direct fire heating system
DE102013110489B4 (de) * 2013-09-23 2022-05-12 Rational Aktiengesellschaft Gargerät sowie Verfahren zur Erkennung des Verschmutzungsgrades einer Filtereinheit
US9980494B2 (en) 2014-08-19 2018-05-29 Illinois Tool Works Inc. Dough proofing apparatus and related methods
KR101707749B1 (ko) * 2015-09-21 2017-02-16 엘지전자 주식회사 조리기기

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2524272A (en) * 1946-08-22 1950-10-03 Steiner Ives Co Direct gas-fired oven
US3605717A (en) * 1969-11-10 1971-09-20 Crown X Inc Convection oven
DE2731191C2 (de) * 1977-07-09 1983-03-10 Lechmetall Landsberg Gmbh, Edelstahlerzeugnisse, 8910 Landsberg Vorrichtung zur Wärmebehandlung von Nahrungsmitteln mittels eines Dampf-Luft-Gemisches
US4648381A (en) * 1984-02-04 1987-03-10 Toshio Ishii Gas cooking oven
US4563945A (en) * 1984-11-13 1986-01-14 Stein Associates, Inc. Heat shield-steam distributor for cooking oven
DE3510680A1 (de) * 1985-03-23 1986-10-02 Buderus Ag, 6330 Wetzlar Verfahren zum langzeit-niedertemperatur-garen

Also Published As

Publication number Publication date
ES2019470B3 (es) 1991-06-16
US4823766A (en) 1989-04-25
EP0277888A1 (fr) 1988-08-10
FR2609532B1 (fr) 1990-12-14
FR2609532A1 (fr) 1988-07-15
DE3861325D1 (de) 1991-02-07

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