EP1176367A1 - Zwangskonvektionsofen zum Backen von Nahrungsmitteln - Google Patents

Zwangskonvektionsofen zum Backen von Nahrungsmitteln Download PDF

Info

Publication number
EP1176367A1
EP1176367A1 EP01116786A EP01116786A EP1176367A1 EP 1176367 A1 EP1176367 A1 EP 1176367A1 EP 01116786 A EP01116786 A EP 01116786A EP 01116786 A EP01116786 A EP 01116786A EP 1176367 A1 EP1176367 A1 EP 1176367A1
Authority
EP
European Patent Office
Prior art keywords
oven
air
fuel
capacity
temperature
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.)
Withdrawn
Application number
EP01116786A
Other languages
English (en)
French (fr)
Inventor
Daniele Pasquino
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.)
Gierre Srl
Original Assignee
Gierre Srl
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 Gierre Srl filed Critical Gierre Srl
Publication of EP1176367A1 publication Critical patent/EP1176367A1/de
Withdrawn legal-status Critical Current

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
    • 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
    • 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

Definitions

  • the invention concerns an oven for food baking of the forced convection type with the heat exchanger inside the baking chamber.
  • This kind of ovens contemplate that in the baking chamber there is a heat exchanger, generally a spiral-shaped wound pipe in which there are some gas circulating, produced by the combustion of a burner, generally a gas burner.
  • the burnt gas that generally are pushed under overpressure inside this heat exchanger, give the heat to the baking chamber also with the help of a ventilator placed inside the baking chamber and more particularly in the cylindrical space defined by the spiral wound heat exchanger. In such a way the heat exchange is optimized.
  • the variation of the heat amount exchanged in the baking chamber in this kind of ovens occurs by increasing or decreasing the gas amount that is sent to the burner.
  • the exhaust gas speed is generally constant inside the heat exchanger and is due to the overpressure produced by ventilators placed ahead of or below the heat exchanger.
  • the Italian patent IT 1220069 presents a gas-fed oven in which the heat exchanger that is inside the oven compartment is formed by a spiral wound pipe where circulates the exhaust smoke due to the combustion of a gas burner. Such smoke is speeded up through an ejector placed on the end side of the exhaust pipe that produces through a ventilator a draft carrying away the smoke on the outside producing a depression just next to the exhaust speeding up the exit of the smoke.
  • the speeding up of the smoke is obtained having just one ventilator ahead of the burner.
  • the ventilator supplies an air overplus in a chamber for the air/fuel combustion so that the air overplus not used for the combustion is used to speed up the smoke exit.
  • the object of the present invention is that of realizing a forced convection oven in which it is possible to increase or decrease the heat exchange inside the baking chamber also by increasing the speed of the exhaust gas of the combustion without affecting the quality of the combustion to be obtained.
  • Another object that is intended by the invention is that of relating directly the increase or the decrease of temperature inside the chamber of the oven and the capacity of the air/fuel mixture that the burner is supplied with.
  • Another object of the invention is that of realizing the adjustment of the increasing or decreasing temperature inside the oven chamber, through simple and functional means.
  • Another object of the invention is that of realizing an oven with reliable and low-priced devices.
  • a forced convection oven for food baking that according to claim one includes:
  • the air/fuel mixing that is generally realized through methane, propane or the like occurs through a mixer valve ensuring a constant air/fuel ratio, more specifically according to a preferred embodiment the mixer valve ensures a constant 1:1 ratio.
  • the heat supply needed to reach a certain temperature is due to the increase in the capacity of the combustible mixture air/gas, said capacity being varied through the number of revolutions of at least one ventilator that is placed indifferently ahead of or below the mixer valve and that causes the variation of the capacity of the air/fuel mixture as a direct function of the number of revolutions.
  • an electronic gearcase that is reached by a signal proportional to the temperature detected in the oven chamber, emits a signal proportional to the difference between the predetermined set out temperature and the temperature detected in the oven chamber, in such a way to vary the number of revolutions of the ventilator. It is evident that in such a way the capacity of the air/fuel mixture increases through the increase of the number of revolutions and therefore, increasing the burnt gas, the heat brought to the heat exchanger and consequently to the baking chamber increases too. By decreasing the number of revolutions of the ventilator, the capacity decreases and therefore the heat supplied to the baking chamber decreases too.
  • the forced convection oven marked with 1 has an internal heat exchanger marked with 2 that in the case of the example is spiral wound on the ideal generating lines of a cylinder, so that it leaves an internal cylindrical space to put a ventilator 7 suitable to increase the heat exchange with the baking chamber 3 used for the food baking.
  • the pipe 2 has an inlet 21 and an end side 22. At the inlet 21 there is the head 41 of a burner marked with 4 as a whole, so that the combustion smoke after having passed through the inside of the pipe of the exchanger 2 , comes out trough the end side 22 and carry on through the smoke outlet stack not represented as a figure.
  • the burner unit 4 has the air inlet pipe 42 facing the mixer valve marked with 43 as a whole that, as it can be observed schematically in fig. 1, is formed substantially by a Venturi pipe 44 and by a proper valve body 48 .
  • the duct 45 supplies with the gas that is mixed with the air coming from the inlet 42 and that goes into the inlet 441 of the Venturi pipe 44.
  • the air/fuel mixture comes to the ventilator 46 that therefore speeds up the capacity of the air/gas mixture that comes to the head of the burner 41 priming the flame.
  • the ventilator 46 varies its speed, it can be understood how, increasing the number of revolutions the returning action of the air/gas mixture coming out from the opening 442 increases too, so that a depression is produced at the beginning in the Venturi pipe 44 that is perceived by the pipe 47 full of air that is connected to the valve body 48.
  • valve body 48 is such as it ensures that by the decrease of the air pressure, due to the increase of the capacity drawn by the ventilator 46, an equal rise of the opening of the opening and closing valve is produced, so that the gas passing through the pipe 45 increases. Consequently the increase of the revolutions of the ventilator 46 corresponds to an increase of the capacity of the air/gas mixture with unchanged proportions between the air and the gas.
  • the chamber 3 of the oven 1 has a temperature sensor Tf, sending to an electronic gearcase 6 the temperature signal Tf that is compared with the previously set out and wanted temperature.
  • the difference between the set out temperature Ti and the temperature Tf measured in the chamber causes the emission of a signal ⁇ T coming out from the gearcase T6 and allows the variation of the number of revolutions of the ventilator 46, in a way known by the skilled person, for example varying the electric frequency of the ventilator input.
  • the signal ⁇ T coming out from the gearcase 6 will lower the number of revolutions of the ventilator and therefore will produce a temporary overpressure in the duct 47 and consequently a decrease of the gas discharge in the duct 45 with a consequent reduction of the capacity of the fuel mixture.
  • the gearcase 6 can predict the setting out of the prearranged temperature for the oven baking, but also the possibility that some temperatures are reached within some time and kept during a certain interval, both rising and falling.
  • the heat exchanger 2 As to the heat exchanger 2, it can be observed that it can be realized both spiral wound and through concentric pipes, one, two or more according to the need and the constructive advantages that these can have.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Baking, Grill, Roasting (AREA)
  • Cookers (AREA)
EP01116786A 2000-07-25 2001-07-23 Zwangskonvektionsofen zum Backen von Nahrungsmitteln Withdrawn EP1176367A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT2000VI000160A IT1315481B1 (it) 2000-07-25 2000-07-25 Forno a convezione forzata per la cottura di alimenti
ITVI000160 2000-07-25

Publications (1)

Publication Number Publication Date
EP1176367A1 true EP1176367A1 (de) 2002-01-30

Family

ID=11461331

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01116786A Withdrawn EP1176367A1 (de) 2000-07-25 2001-07-23 Zwangskonvektionsofen zum Backen von Nahrungsmitteln

Country Status (2)

Country Link
EP (1) EP1176367A1 (de)
IT (1) IT1315481B1 (de)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
DE202004015288U1 (de) * 2004-10-01 2006-02-09 Wss Gmbh Vorrichtung zum Verteilen von Abgasen aus einer Brennkammer
US7017571B2 (en) * 2003-06-18 2006-03-28 Convotherm Elektrogeräte GmbH Heat exchanger device
EP1906095A3 (de) * 2006-09-14 2011-04-06 Miele & Cie. KG Verfahren zur Regelung des Abluftvolumenstroms aus einem Garraum eines Backofens
US8075304B2 (en) 2006-10-19 2011-12-13 Wayne/Scott Fetzer Company Modulated power burner system and method

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2417842A (en) * 1942-03-17 1947-03-25 Sanford Cooking stove
EP0349233A2 (de) * 1988-06-27 1990-01-03 Davair Heating Limited Verfahren und Vorrichtung zur Raumbeheizung
EP0526768A2 (de) * 1991-08-05 1993-02-10 ZANUSSI GRANDI IMPIANTI S.p.A. Gasbeheizter Ofen mit erzwungener Konvektion
DE19712227A1 (de) * 1997-03-24 1998-10-01 Kueppersbusch Kombidämpfgerät
US5909533A (en) * 1998-04-06 1999-06-01 Dacor, Inc. Electric cooking oven with infrared gas broiler
EP1116920A2 (de) * 2000-01-10 2001-07-18 Levens Group B.V. Gasbeheizter Ofen

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2417842A (en) * 1942-03-17 1947-03-25 Sanford Cooking stove
EP0349233A2 (de) * 1988-06-27 1990-01-03 Davair Heating Limited Verfahren und Vorrichtung zur Raumbeheizung
EP0526768A2 (de) * 1991-08-05 1993-02-10 ZANUSSI GRANDI IMPIANTI S.p.A. Gasbeheizter Ofen mit erzwungener Konvektion
DE19712227A1 (de) * 1997-03-24 1998-10-01 Kueppersbusch Kombidämpfgerät
US5909533A (en) * 1998-04-06 1999-06-01 Dacor, Inc. Electric cooking oven with infrared gas broiler
EP1116920A2 (de) * 2000-01-10 2001-07-18 Levens Group B.V. Gasbeheizter Ofen

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
DE202004015288U1 (de) * 2004-10-01 2006-02-09 Wss Gmbh Vorrichtung zum Verteilen von Abgasen aus einer Brennkammer
EP1906095A3 (de) * 2006-09-14 2011-04-06 Miele & Cie. KG Verfahren zur Regelung des Abluftvolumenstroms aus einem Garraum eines Backofens
US8075304B2 (en) 2006-10-19 2011-12-13 Wayne/Scott Fetzer Company Modulated power burner system and method
US9719683B2 (en) 2006-10-19 2017-08-01 Wayne/Scott Fetzer Company Modulated power burner system and method

Also Published As

Publication number Publication date
ITVI20000160A0 (it) 2000-07-25
ITVI20000160A1 (it) 2002-01-25
IT1315481B1 (it) 2003-02-18

Similar Documents

Publication Publication Date Title
US9772119B2 (en) Fuel-fired heating appliance having improved burner assembly
US7422009B2 (en) Gas “true” convection bake oven
US6655373B1 (en) High efficiency conveyor oven
CN110546434B (zh) 燃烧器的控制系统
US4111181A (en) Combustion air system
US20150211751A1 (en) Radiant heating assembly and method of operating the radiant heating assembly
US5320520A (en) Gas burner assembly for simulating a natural log fire
US20130302737A1 (en) Furnace burner radiation shield
US4109636A (en) Forced convection ovens
AU2018250201B2 (en) Conveyor oven heat delivery system
EP1176367A1 (de) Zwangskonvektionsofen zum Backen von Nahrungsmitteln
EP0299394B1 (de) Vorrichtung für Gasverbrennung
RU2208201C2 (ru) Керамическая газовая горелка и регенератор тепла, снабженный этой горелкой
US20100206304A1 (en) Apparatus for Supply Mixed Gas for Gas Burners of Radiant Heating Type
CN220669447U (zh) 燃烧器
EP0813836A1 (de) Verbesserungen an der Wirbelbildungsvorrichtung von einem Gas-beheizten Frietiergerät
US20020157659A1 (en) Gas broiler
JPH07509050A (ja) 燃料燃焼バーナー
JP5296393B2 (ja) 木質ペレット燃焼装置
CA2876823C (en) Home appliance with gas igniter having heating element and shroud
EP1424008B1 (de) Umluftofen mit einem Radialflammenbrenner
CN117091132B (zh) 燃烧器
JP7141574B1 (ja) 送風バーナ装置
US7341448B2 (en) Gas-fired heating apparatus
US220530A (en) Improvement in stoves and furnaces

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR

AX Request for extension of the european patent

Free format text: AL;LT;LV;MK;RO;SI

17P Request for examination filed

Effective date: 20020718

AKX Designation fees paid

Free format text: AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR

AXX Extension fees paid

Free format text: LT PAYMENT 20020718;MK PAYMENT 20020718;RO PAYMENT 20020718;SI PAYMENT 20020718

17Q First examination report despatched

Effective date: 20030131

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 20030812