EP0152571A2 - Ofen mit erzwungener Konvektion - Google Patents

Ofen mit erzwungener Konvektion Download PDF

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Publication number
EP0152571A2
EP0152571A2 EP84114861A EP84114861A EP0152571A2 EP 0152571 A2 EP0152571 A2 EP 0152571A2 EP 84114861 A EP84114861 A EP 84114861A EP 84114861 A EP84114861 A EP 84114861A EP 0152571 A2 EP0152571 A2 EP 0152571A2
Authority
EP
European Patent Office
Prior art keywords
fan
cooking chamber
air
diffusor
forced convection
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
EP84114861A
Other languages
English (en)
French (fr)
Other versions
EP0152571B1 (de
EP0152571A3 (en
Inventor
Claudio Del Fabbro
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
Priority to AT84114861T priority Critical patent/ATE46962T1/de
Publication of EP0152571A2 publication Critical patent/EP0152571A2/de
Publication of EP0152571A3 publication Critical patent/EP0152571A3/en
Application granted granted Critical
Publication of EP0152571B1 publication Critical patent/EP0152571B1/de
Expired 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
    • F24C15/325—Arrangements of ducts for hot gases, e.g. in or around baking ovens with forced circulation electrically-heated

Definitions

  • the present invention relates to a forced convection oven, particularly for community kitchens and the like, provided with means for ensuring uniform distribution of the heat in the interior of a cooking chamber and for thus improving the uniformity of the cooking condition of foods in the cooking chamber.
  • the heated air tends to circulate along preferential paths, resulting in the heat accumulating in specific zones.
  • a first such solution provides for the empirically determined positioning of deflector means in or adjacent an outlet chamber of the motor-driven fan.
  • This solution permits the motor-driven fan to be positioned laterally and a transparent door to be used, but leads to relatively poor results as regards uniform cooking of the foods.
  • a somewhat superior solution by comparison to the one outlined above consists in locating lateral air distributors in the interior of the cooking chamber. These distributors are in the form of metal sheet members provided with suitably arranged and dimensioned perforations and capable of regulating the air circulation, but permitting the interior of the oven through the closed door only if the motor-driven fan is mounted adjacent the rear wall.
  • a further solution optionally to be employed in combination with the above mentioned air distributors, provides for the installation of air outlet ducts of variable cross-section for obtaining uniform velocity of the air outflow from the perforations of the distributors.
  • This solution is also subject to the limitations of the preceding solution, and additionally results in a more complicated construction of the oven, as it requires the cooking chamber to be designed with inclined walls.
  • a forced convection oven particularly for community kitchens and the like, comprising a cooking chamber and mounted therein a motor-driven fan provided with an air diffusor, this oven-being characterized in that said air diffusor is of circular configuration and disposed immediately adjacent the rotor of said fan, and is provided with a plurality of blades of curvilinear shape for ensuring the outflow of the air towards said cooking chamber in substantially radial directions with respect to the axis of said fan and at a relatively low velocity.
  • the oven shown in figs. 1 and 2 of the drawings comprises a cooking chamber 5 having an access opening closed by a transparent door 6 and located at the front of the oven.
  • cooking chamber 5 Provided within cooking chamber 5 is an arrangement of rails 7 for carrying a number of shelves 8 adapted to have containers for the foods to be cooked placed thereon.
  • a fan 9 driven by an electric motor 10, the latter being housed in a lateral housing portion 11 and operatively connected to fan 9 through a shaft extending through the respective lateral wall of the cooking chamber.
  • a partition 12 formed with bent edge portions so as to define-an air outlet duct leading towards the cooking chamber.
  • Partition 12 is further formed with a circular central opening 14 for the return of the air from the cooking chamber to the fan.
  • electric resistance heaters 15 Disposed around fan 9 are electric resistance heaters 15 for heating the air supplied to the cooking chamber.
  • a circular diffusor 16 having a plurality of blades 17 of curvilinear shape is disposed between fan 9 and resistance heaters 15.
  • the number and the shape of blades 17 are determined as a function of the characteristics of the fan so as to ensure the outflow of the air through passage 13 towards the cooking chamber in substantially radial directions with respect to the axis of fan 9 and at a relatively low velocity.
  • the outflow velocity of the air from fan 9 may for instance be 30 to 40 m/sec, while the outflow velocity from diffusor 16 is reduced by the factor 10, i.e. to about 3 to 4 m/sec.
  • a fan located at the center of a cooking chamber of rectangular cross-section will circulate the air at considerably different velocities and pressures at the four corners of the outlet chamber due to the prevalently tangential escape of the air from the fan.
  • the employ of diffusor 16 in the solution according to the invention results in a reduced air flow velocity and a more uniform pressure distribution in the outlet chamber, so that the air escapes from passage 13 at a uniform velocity, and is distributed within the cooking chamber in such a manner as to ensure more uniform cooking temperatures at all positions on shelves 8.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Cookers (AREA)
  • Baking, Grill, Roasting (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Resistance Heating (AREA)
  • Constitution Of High-Frequency Heating (AREA)
  • Meat, Egg Or Seafood Products (AREA)
EP84114861A 1984-01-20 1984-12-06 Ofen mit erzwungener Konvektion Expired EP0152571B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT84114861T ATE46962T1 (de) 1984-01-20 1984-12-06 Ofen mit erzwungener konvektion.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT8434004U IT8434004V0 (it) 1984-01-20 1984-01-20 Forno a convezione forzata.
IT3400484U 1984-01-20

Publications (3)

Publication Number Publication Date
EP0152571A2 true EP0152571A2 (de) 1985-08-28
EP0152571A3 EP0152571A3 (en) 1987-08-12
EP0152571B1 EP0152571B1 (de) 1989-10-04

Family

ID=11238526

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84114861A Expired EP0152571B1 (de) 1984-01-20 1984-12-06 Ofen mit erzwungener Konvektion

Country Status (5)

Country Link
EP (1) EP0152571B1 (de)
AT (1) ATE46962T1 (de)
DE (1) DE3480019D1 (de)
ES (1) ES283697Y (de)
IT (1) IT8434004V0 (de)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0274902A2 (de) * 1987-01-14 1988-07-20 Lincoln Foodservice Products, Inc. Luftstromsystem für einen Flachformumluftofen
US4771163A (en) * 1987-06-15 1988-09-13 Brute Kitchen Equipment Company Inc. Baking oven
EP0409324A1 (de) * 1989-07-18 1991-01-23 Whirlpool International B.V. Heissluftofen
EP0926449A1 (de) * 1997-12-23 1999-06-30 eloma GmbH Grossküchentechnik Verfahren zum Entfeuchten eines Garraumes eines Dampfgargerätes sowie Vorrichtung hierfür
WO2007138015A1 (en) * 2006-05-26 2007-12-06 Arcelik Anonim Sirketi An oven
WO2008148675A2 (de) * 2007-06-05 2008-12-11 BSH Bosch und Siemens Hausgeräte GmbH Backofen
US9319242B2 (en) 2003-04-30 2016-04-19 Nokia Technologies Oy Handling traffic flows in a mobile communications network

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2649528A1 (de) * 1975-12-09 1977-06-16 Eugene Scholtes Lagrangethionv Elektroherd fuer den haushaltsgebrauch
DE2557867A1 (de) * 1975-12-22 1977-06-30 Bosch Siemens Hausgeraete Umluftofen
DE2614818B1 (de) * 1976-04-06 1977-09-29 Hans Dr H C Vogt Vorrichtung zur Garung von Nahrungsmitteln mittels schnellstroemender Heissluft
DE3117171A1 (de) * 1981-04-30 1982-11-18 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Back- und bratofen

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2649528A1 (de) * 1975-12-09 1977-06-16 Eugene Scholtes Lagrangethionv Elektroherd fuer den haushaltsgebrauch
DE2557867A1 (de) * 1975-12-22 1977-06-30 Bosch Siemens Hausgeraete Umluftofen
DE2614818B1 (de) * 1976-04-06 1977-09-29 Hans Dr H C Vogt Vorrichtung zur Garung von Nahrungsmitteln mittels schnellstroemender Heissluft
DE3117171A1 (de) * 1981-04-30 1982-11-18 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Back- und bratofen

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0274902A2 (de) * 1987-01-14 1988-07-20 Lincoln Foodservice Products, Inc. Luftstromsystem für einen Flachformumluftofen
EP0274902A3 (de) * 1987-01-14 1989-09-06 Lincoln Foodservice Products, Inc. Luftstromsystem für einen Flachformumluftofen
US4771163A (en) * 1987-06-15 1988-09-13 Brute Kitchen Equipment Company Inc. Baking oven
EP0409324A1 (de) * 1989-07-18 1991-01-23 Whirlpool International B.V. Heissluftofen
EP0926449A1 (de) * 1997-12-23 1999-06-30 eloma GmbH Grossküchentechnik Verfahren zum Entfeuchten eines Garraumes eines Dampfgargerätes sowie Vorrichtung hierfür
US6070517A (en) * 1997-12-23 2000-06-06 Eloma Gmbh Grobkuchentechnik Removing dampness from the cooking space of a pressure cooker and device herefor
US9319242B2 (en) 2003-04-30 2016-04-19 Nokia Technologies Oy Handling traffic flows in a mobile communications network
WO2007138015A1 (en) * 2006-05-26 2007-12-06 Arcelik Anonim Sirketi An oven
WO2008148675A2 (de) * 2007-06-05 2008-12-11 BSH Bosch und Siemens Hausgeräte GmbH Backofen
WO2008148675A3 (de) * 2007-06-05 2009-11-05 BSH Bosch und Siemens Hausgeräte GmbH Backofen

Also Published As

Publication number Publication date
EP0152571B1 (de) 1989-10-04
ES283697Y (es) 1985-12-16
ATE46962T1 (de) 1989-10-15
ES283697U (es) 1985-05-01
EP0152571A3 (en) 1987-08-12
IT8434004V0 (it) 1984-01-20
DE3480019D1 (en) 1989-11-09

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