EP0809078B1 - Kochgerät mit Gebläsebrenner - Google Patents
Kochgerät mit Gebläsebrenner Download PDFInfo
- Publication number
- EP0809078B1 EP0809078B1 EP97103503A EP97103503A EP0809078B1 EP 0809078 B1 EP0809078 B1 EP 0809078B1 EP 97103503 A EP97103503 A EP 97103503A EP 97103503 A EP97103503 A EP 97103503A EP 0809078 B1 EP0809078 B1 EP 0809078B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- combustion chamber
- gas
- main
- thermostat
- cooking
- 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
Links
Images
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
- F24C3/00—Stoves or ranges for gaseous fuels
- F24C3/12—Arrangement or mounting of control or safety devices
- F24C3/126—Arrangement or mounting of control or safety devices on ranges
- F24C3/128—Arrangement or mounting of control or safety devices on ranges in baking ovens
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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
- F24C3/00—Stoves or ranges for gaseous fuels
- F24C3/08—Arrangement or mounting of burners
- F24C3/085—Arrangement or mounting of burners on ranges
- F24C3/087—Arrangement or mounting of burners on ranges in baking ovens
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N5/00—Systems for controlling combustion
- F23N5/18—Systems for controlling combustion using detectors sensitive to rate of flow of air or fuel
- F23N2005/181—Systems for controlling combustion using detectors sensitive to rate of flow of air or fuel using detectors sensitive to rate of flow of air
- F23N2005/182—Air flow switch
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2223/00—Signal processing; Details thereof
- F23N2223/22—Timing network
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2227/00—Ignition or checking
- F23N2227/04—Prepurge
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2233/00—Ventilators
- F23N2233/06—Ventilators at the air intake
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2235/00—Valves, nozzles or pumps
- F23N2235/02—Air or combustion gas valves or dampers
- F23N2235/06—Air or combustion gas valves or dampers at the air intake
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2235/00—Valves, nozzles or pumps
- F23N2235/12—Fuel valves
- F23N2235/14—Fuel valves electromagnetically operated
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N5/00—Systems for controlling combustion
- F23N5/02—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium
- F23N5/12—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium using ionisation-sensitive elements, i.e. flame rods
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N5/00—Systems for controlling combustion
- F23N5/20—Systems for controlling combustion with a time programme acting through electrical means, e.g. using time-delay relays
Definitions
- the present invention refers to an apparatus for cooking food, adapted to perform cooking by means of a flow of flue gases which, generated by a plurality of heating elements, is forced by one or more fans to circulate in one or more heat exchangers arranged in a heat-exchanging relation with the cooking cavity in which the food to be cooked is arranged.
- Apparatuses are known in the art, in which the burner, or the element provided to diffuse the flue gas in the air, is enclosed in a chamber forming the actual combustion chamber, into which a flow of air is forced which is taken in from the outside and blown against said burner by a normal fan.
- the US-A-4 240 397 discloses a gas-fuelled oven with a thermostatically controlled gas supply valve which supplies fuel to the gas burner at cycled intervals.
- the US-A-5 197 665 discloses a water heater whereby a blower is maintained in operation for a preset time to exhaust substantially all combustion gases.
- the main advantage of such apparatuses lies in the fact that a much greater heat output is generated and transferred here with respect to equally sized burners and heat exchangers not provided with said forced-draft feature.
- so blown air is used not only as both primary air and secondary air for combustion purposes, but also as "purging" air for the cavity in which the burner is housed, all such terms being well-known to all those who are skilled in the art, so that they shall not be explained any further here.
- Such a ventilation period is intended to "purge”, ie to remove any possible presence of fuel gas that may be stagnating there due to possible leakages through the plug of the gas valve, in view of avoiding explosion risks.
- the purging time shall be selected so as to ensure that the total volume of fresh air circulated in the period turns out to amount to at least five times the volume of the combustion chamber increased by the volume of the heat exchanger and the flue outlet conduit.
- FIGS 1, 2 and 3 are shown to illustrate a food cooking oven of the fan-assisted or forced-convection type used in professional kitchens, comprising a cooking cavity 1, a combustion chamber 2 provided with a gas burner 3, a heat exchanger 4 that doubles as a flue conduit for exhausting the products of combustion, the flame 5 generated by the burner also penetrating said heat exchanger arrangement.
- the oven is also provided with a blower means 14 adapted to take in an air flow from the outside ambient and blow the same flow into said combustion chamber 2.
- All electric circuits of the oven are furthermore connected to the power supply line through a main on-off switch 13, as this is shown in Figure 3.
- the oven Upon starting a cooking operation, the oven is of course cold, or anyway at a lower temperature than actually needed, so that setting the thermostat to the desired cooking temperature value causes said thermostat to close and, therefore, the burner to be ignited by energizing the igniter 7.
- Ignition is further prevented from taking place by the fact that, even if the thermostat 21 is closed, the same thermostat is however connected to the power supply line only through a delaying means 16, preferably a time-delay relay 16 which is in turn energized by a pressure switch 17 arranged on the mouth of the blower and actuated by the air flow brought about by such a blower.
- a delaying means 16 preferably a time-delay relay 16 which is in turn energized by a pressure switch 17 arranged on the mouth of the blower and actuated by the air flow brought about by such a blower.
- the related triggering terminals 19 and 20 are closed only after a pre-determined period of time, during which the combustion chamber is purged, and their being closed causes a particular circuit 20 of the control unit 10 to be connected to the power supply line, so that it will be able to immediately operate the igniter 7 for the ignition of the burner. It will therefore be fully appreciated that such an igniter is by all means and positively operated only after such a delay time is elapsed and the combustion chamber has therefore been purged.
- the thermostat 21 Upon reaching the pre-set cooking temperature, the thermostat 21 opens, but this has actually no effect on the time-delay relay 16, which therefore stays closed since it is being energized by the main on-off switch 13 on the one hand and, on the other hand, by the pressure switch 17 that is actuated by the still operating blower 14.
- the purging of the combustion chamber is simply and fully obtained also under blower-off conditions, ie. with de-energized blower (see Figure 2), by the simple natural ventilating action of the atmospheric air flowing through said combustion chamber by passing through the heat exchanger 4 on the one side and, on the other side, through at least an adequately sized opening 26 that is provided in an appropriate position on one side of the combustion chamber.
- said opening 26 For a correct, balanced operation of the oven it is of course necessary for said opening 26 to be sufficiently large so as to enable the combustion chamber to be correctly ventilated by said natural air flow within a pre-determined time.
- the same opening 26 shall however not be too large, ie. so large as to become a possible way through which the air blown into the combustion chamber, which must be mainly used as primary air and secondary air for the combustion of the gas, can leak.
- the aim is in this manner reached of ensuring that, when the burner is off, the combustion chamber is anyway ventilated permanently and, as a result, purged by a modest, but sufficient natural flow of atmospheric air that enables the burner to be ignited immediately, so that the need no longer arises for a special preliminary phase of forced ventilation and purging of said combustion chamber to be provided before igniting the burner.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Control Of Combustion (AREA)
- Regulation And Control Of Combustion (AREA)
- General Preparation And Processing Of Foods (AREA)
Claims (9)
- Gasbetriebene Vorrichtung zum Zubereiten von Lebensmitteln, die eine Kochkammer (1), einen elektrischen Haupt-An/Aus-Schalter (13), der das elektrische System der Vorrichtung mit der Stromversorgungsleitung verbindet, eine Brennkammer (2), einen Druckzug-Gasbrenner (3), einen Wärmetauscher (4), der möglicherweise eine Abgasleitung aufweist, und einen Kochholraum, eine Gebläseeinrichtung (14), die mit der Brennkammer verbunden ist und einen Strom atmosphärischer Luft in einem im Wesentlichen offenen Kreis zirkulieren lässt, der durch die Brennkammer und den Wärmetauscher gebildet wird, einen Thermostat (21), der sich schließen muss, um den Zünder (7) in die Lage zu versetzen, den Gasbrenner (3) zu zünden, umfasst, wobei das Öffnen des Thermostats bewirkt, dass ein Ventil (9), das in der Gaszuführzuleitung (8) vorhanden ist, durch die Wirkung einer Steuereinheit (10) geschlossen wird, dadurch gekennzeichnet, dass die Steuereinheit (10) gewährleistet, dass nach dem ersten Schließ/Öffnungs-Zyklus des Thermostats (21) auf die Betätigung des Haupt-An/Aus-Schalters (13) folgend, jedes folgende Schließen des Thermostats ermöglicht, dass der Zünder (7) den Gasbrenner sofort zündet.
- Gasbetriebene Vorrichtung nach dem einleitenden Teil von Anspruch 1, dadurch gekennzeichnet, dass sie mit einer Gebläseeinrichtung (14) versehen ist, die von außen angesaugte Luft bläst und in der Lage ist, die Spülphase der Brennkammer unmittelbar nach dem Anschalten des elektrischen Haupt-An/Aus-Schalters (13) in Gang zu setzen, wobei die Gebläseeinrichtung solange aktiviert ist, wie der elektrische Haupt-An/Aus-Schalter angeschaltet ist.
- Gasbetriebene Vorrichtung nach Anspruch 2, dadurch gekennzeichnet, dass die Gebläseeinrichtung in der Lage ist, die Spülphase der Brennkammer innerhalb eines vorgegebenen Zeitraums abzuschließen.
- Kochherd nach Anspruch 3, dadurch gekennzeichnet, dass:das erste Zünden des Brenners nach dem Anschalten des Haupt-An/Aus-Schalters (13) erfolgt, nachdem eine vorgegebene Belüftungszeit auf das Schließen des Thermostats (21) folgend verstrichen ist, wobei die vorgegebene Belüftungszeit wenigstens der Zeit entspricht, die erforderlich ist, um die Brennkammer und den Wärmetauscher (4) auszuspülen,wobei die vorgegebene Belüftungszeit durch eine Zeitverzögerungseinrichtung (16) bestimmt wird.
- Kochvorrichtung nach Anspruch 4, dadurch gekennzeichnet, dass die Luft zum Belüften und Ausspülen der Brennkammer über den gleichen Abgas-Wärmetauscher (4) abgeleitet wird.
- Kochvorrichtung nach einem der vorangehenden Ansprüche 2 bis 5, dadurch gekennzeichnet, dass alle Zündvorgänge des Gasbrenners in der Brennkammer, nach dem ersten auf das Anschalten des elektrischen Haupt-An/Aus-Schalters folgend unmittelbar nach entsprechenden Schließvorgängen des Thermostats (21) stattfinden.
- Kochvorrichtung nach Anspruch 5, dadurch gekennzeichnet, dass sie mit einer Einrichtung (17) versehen ist, die das Vorhandensein eines durch die Gebläseeinrichtung (14) erzeugten Luftstroms erfasst, und dass, wenn dieses Vorhandensein erfasst wird, ein Betätigungsanschluss der Zeitverzögerungseinrichtung (16) mit einem der inneren Pole des elektrischen Haupt-An/Aus-Schalters verbunden wird, wobei der andere Betätigungsanschluss der Zeitverzögerungseinrichtung mit dem anderen der inneren Pole des Haupt-An/Aus-Schalters verbunden wird.
- Kochvorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass die Brennkammer mit wenigstens einer Öffnung (26) zur Atmosphäre hin, vorzugsweise dem Wärmetauscher (4) selbst, versehen ist, die einen natürlichen Ableitungsweg für nicht verbrannte Brenngase bildet.
- Kochvorrichtung nach Anspruch 8, dadurch gekennzeichnet, dass die Brennkammer mit wenigstens einer Öffnung (26) versehen ist, die einen natürlichen Einlass für einen Strom äußerer Luft in die Kammer (1) bewirkt, und dass jedes Zünden des Gases in der Brennkammer nach dem Anschalten des elektrischen Haupt-An/Aus-Schalters unmittelbar nach entsprechenden Schließvorgängen des Thermostats (21) stattfindet.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT96PN000031A IT1289379B1 (it) | 1996-05-22 | 1996-05-22 | Apparecchiatura di cottura con bruciatore ad aerazione forzata |
ITPN960031 | 1996-05-22 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0809078A2 EP0809078A2 (de) | 1997-11-26 |
EP0809078A3 EP0809078A3 (de) | 2000-03-08 |
EP0809078B1 true EP0809078B1 (de) | 2002-07-17 |
Family
ID=11395145
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP97103503A Expired - Lifetime EP0809078B1 (de) | 1996-05-22 | 1997-03-04 | Kochgerät mit Gebläsebrenner |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP0809078B1 (de) |
DE (1) | DE69713956T2 (de) |
DK (1) | DK0809078T3 (de) |
ES (1) | ES2180834T3 (de) |
IT (1) | IT1289379B1 (de) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2351146B (en) * | 1999-06-19 | 2001-07-25 | Stoves Group Plc | Cooking appliances |
FR2899956B1 (fr) * | 2006-04-14 | 2008-07-25 | Thirode Grandes Cuisines Poligny | Bruleur a gaz pour four de cuisine |
ITTO20130331A1 (it) * | 2013-04-23 | 2014-10-24 | Indesit Co Spa | Forno a gas ad alto rendimento e metodo per il suo funzionamento |
ITUB20159610A1 (it) * | 2015-12-21 | 2017-06-21 | Satengineering Sas Di Francesco Dursi & C | Forno di cottura |
US20200305642A1 (en) * | 2019-03-29 | 2020-10-01 | Lifetime Products, Inc. | Fluid optimization mechanisms for cooking devices |
IT202100002357A1 (it) | 2021-02-03 | 2022-08-03 | Ali Group S R L | “dispositivo antirisonanza in un forno a gas del tipo per la cottura degli alimenti nella ristorazione collettiva” |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4240397A (en) * | 1979-01-24 | 1980-12-23 | Raytheon Company | Fuel saver oven |
IT1220754B (it) * | 1988-06-01 | 1990-06-21 | Zanussi Grandi Impianti Spa | Forno di cottura a gas a convezione forzata |
US5197665A (en) * | 1990-11-29 | 1993-03-30 | Rheem Canada Ltd. | Water heater |
IT235007Y1 (it) * | 1994-01-17 | 2000-03-31 | Zanussi Grandi Impianti Spa | Forno di cottura con generatore di vapore a bruciatore soffiato |
-
1996
- 1996-05-22 IT IT96PN000031A patent/IT1289379B1/it active IP Right Grant
-
1997
- 1997-03-04 EP EP97103503A patent/EP0809078B1/de not_active Expired - Lifetime
- 1997-03-04 DK DK97103503T patent/DK0809078T3/da active
- 1997-03-04 DE DE69713956T patent/DE69713956T2/de not_active Expired - Fee Related
- 1997-03-04 ES ES97103503T patent/ES2180834T3/es not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
ITPN960031A1 (it) | 1997-11-22 |
DE69713956D1 (de) | 2002-08-22 |
ES2180834T3 (es) | 2003-02-16 |
DE69713956T2 (de) | 2002-11-07 |
EP0809078A3 (de) | 2000-03-08 |
EP0809078A2 (de) | 1997-11-26 |
IT1289379B1 (it) | 1998-10-02 |
DK0809078T3 (da) | 2002-11-04 |
ITPN960031A0 (it) | 1996-05-22 |
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