EP3885655A1 - Backofen - Google Patents

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Publication number
EP3885655A1
EP3885655A1 EP20165504.0A EP20165504A EP3885655A1 EP 3885655 A1 EP3885655 A1 EP 3885655A1 EP 20165504 A EP20165504 A EP 20165504A EP 3885655 A1 EP3885655 A1 EP 3885655A1
Authority
EP
European Patent Office
Prior art keywords
loop
oven
shaped heating
heating rod
rod
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.)
Pending
Application number
EP20165504.0A
Other languages
English (en)
French (fr)
Inventor
Tiziano Toschi
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 Appliances AB
Original Assignee
Electrolux Appliances AB
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 Electrolux Appliances AB filed Critical Electrolux Appliances AB
Priority to EP20165504.0A priority Critical patent/EP3885655A1/de
Publication of EP3885655A1 publication Critical patent/EP3885655A1/de
Pending 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
    • F24C7/00—Stoves or ranges heated by electric energy
    • F24C7/06—Arrangement or mounting of electric heating elements

Definitions

  • the present invention relates to an oven, particularly a household baking oven, according to the preamble of claim 1.
  • the present invention further relates to a method for operating an oven according to the preamble of claim 13.
  • Household baking ovens are usually equipped with several heating elements in order to provide the user the opportunity to run baking, roasting, broiling, frying or grilling oven programs for using a preparation process adapted to the respective food to be prepared.
  • heating elements which are operated in combination with a fan for oven programs using air recirculation for the distribution of heat within on oven compartment.
  • heating elements known for food treatment from above or from below which are usually formed as tubular resistance heaters and which are operated, in that electric power being converted into heat energy.
  • the heating elements for heating from above or from below are individually designed, each one in a way that the heat emitted from said heating elements is intended to be evenly distributed over the entire horizontal cross-sectional area of the oven compartment, either top-down by the top heat heating element or bottom-up by the bottom heat heating element.
  • the top heat heating element comprises an outer and an inner loop-shaped heating rod or resistance heater, usually designed as tubular heating element, wherein said outer and inner loops comprise both bordering and inscribed loop portions.
  • the object is achieved for an oven, particularly a household baking oven, according to the preamble of claim 1 by means of the characterizing features of claim 1.
  • an oven particularly a household baking oven, comprises an oven compartment, an oven door closing the oven compartment at a front opening and a heating element arranged on a top side of the oven compartment for top heat food preparation, in particular for baking, roasting, broiling, frying and/or for grilling.
  • the oven compartment is defined by a top wall, a bottom wall, a rear wall and side walls.
  • the heating element comprises at least a first loop-shaped heating rod or resistance heater, particularly of tubular design, which first loop-shaped heating rod or resistance heater is preferably arranged in parallel to the top wall, and a second loop-shaped heating rod or resistance heater, particularly of tubular design, which second loop-shaped heating rod or resistance heater is preferably arranged in parallel to the top wall.
  • Each of the first loop-shaped heating rod and the second loop-shaped heating rod is designed as a single-loop unit of at least essentially rectangular loop shape.
  • the first loop-shaped heating rod frames an at least essentially rectangular first area and the second loop-shaped heating rod frames an at least essentially rectangular second area.
  • the at least essentially rectangular first area is larger than the at least essentially rectangular second area.
  • the at least essentially rectangular second area is kept free from heating element sections or components.
  • the first loop-shaped heating rod encompasses the second loop-shaped heating rod.
  • the first loop-shaped heating rod and the second loop-shaped heating rod are arranged in the same plane.
  • the first loop-shaped heating rod and the second loop-shaped heating rod (15b') may have different geometries, but preferably they are geometrically similar parts.
  • the first loop-shaped heating rod and the second loop-shaped heating rod are shaped as rounded-corner rectangles.
  • the oven compartment is particularly of an at least approximately cuboid shape and preferably comprises rounded-corner vertical side edges.
  • Each of the first loop-shaped heating rod and the second loop-shaped heating rod may comprise
  • Each one of the front, the left and right and of the rear bar portions or rod portions of the first loop-shaped heating rod may be at least approximately equally spaced from one of the oven door, the side walls and the rear wall at a first distance
  • each one of the front, the left and right and of the rear bar portions or rod portions of the second loop-shaped heating rod may be at least approximately equally spaced from one of the oven door, the side walls and the rear wall at a second distance. With such equal spacings, the heat portions emitted into directions towards the surrounding walls (including the door wall) may be similarly reflected and an even heat distribution within the oven compartment can be supported.
  • first and second loop-shaped heating rods or resistance heaters are individually controllable.
  • the second loop-shaped heating rod or resistance heater is concentrically arranged to the first loop-shaped heating rod or resistance heater, particularly differing only in the dimensions.
  • the second loop-shaped heating rod or resistance heater frames an at least approximately rectangular second area, which is preferably kept free from heating element sections or components.
  • "Kept free” in this context not only means that the second loop-shaped heating rod or resistance heater no longer comprises any indentation or recess entering into the at least essentially rectangular second area, as known from the prior art solution, but there is also no further heating element part or component, such as a third heating rod or third resistance heater, implemented in said at least essentially rectangular second area.
  • the inventor has surprisingly found that, contrary to a skilled person's expectations, said keeping the interior of the heating element free from sections or components rather improves the even heat distribution over the entire horizontal cross-sectional area of the oven compartment, which results in the specific geometric conditions inside and adjusted constructions of the oven compartment.
  • a specifically preferred embodiment is characterized in that the at least essentially rectangular second area covers the centre zone of a horizontal cross-sectional area of the oven compartment, the at least essentially rectangular second area framing a ratio of at least 30%, particularly at least 35%, more particularly at least 40% of the horizontal cross-sectional area.
  • the first loop-shaped heating rod or resistance heater is operable with an electrical power having a value of between 50% and 80%, preferably of between 55% and 70%, more preferably of about 60%, in relation to the second loop-shaped heating rod or resistance heater.
  • the oven may comprise a first loop-shaped heating rod or resistance heater, which is operable with an electrical power between 0.9 and 1.7 kW, preferably between 1.1 and 1.5 kW, more preferably of about 1.3 kW.
  • the oven may further comprise a second loop-shaped heating rod or resistance heater, which is operable with an electrical power between 0.5 and 1.1 kW, preferably between 0.65 and 0.95 kW, more preferably of about 0.8 kW.
  • the object is achieved for a method for operating an oven, particularly a household baking oven, which oven is designed according to anyone of the above-described embodiments, by means of the characterizing feature of claim 13.
  • a method for operating an oven comprises a control unit, which operates the heating element during a top heat food preparation operating program, in particular a baking, a roasting, a broiling, a frying and/or a grilling operating program.
  • a specific embodiment of the method provides for at least one of the first and the second loop-shaped heating rods or resistance heaters, which is operated during said top heat food preparation operating program. At least one of the first and the second loop-shaped heating rods or resistance heaters is preferably operated during a top heat baking, roasting, broiling and/or frying operating program and both the first and the second loop-shaped heating rods or resistance heaters are preferably operated during a grilling operating program.
  • FIG. 1 an electric household built-in oven 1 of the prior art is partly shown in a perspective view.
  • a top wall of the compartment 3 as well as a top wall of an oven casing 5 surrounding the compartment 3 are cut away.
  • the compartment 3 is of a cuboid shape, comprising the cut-away top wall, a bottom wall 7, a rear wall 9 and two side walls 11a, 11b.
  • the compartment 3 On its front side, the compartment 3 is open for providing a loading opening for the food to be prepared in the oven 1.
  • said loading opening is closed by the user by means of an oven door 13, which is pivotally arranged at the bottom side of the loading opening, after the loading of food.
  • top heat heating element 15 Due to the top walls of the casing 5 and the compartment 3 being cut away, a top heat heating element 15 is visible. Said top heat heating element 15 is arranged inside of the compartment 3 close to the top wall of the compartment 3 in a parallel alignment thereto.
  • the oven 1 further comprises insertion supports 17 attached at the side walls 11a, 11b (only insertion support 17 at left side wall 11a shown) for receiving baking trays and supporting them during the cooking process.
  • the top heat heating element 15 comprises an outer loop-shaped heating rod 15a and an inner loop-shaped heating rod 15b, which are individually operable for modifiable heat emission. Therefore, terminals L, N are provided in order to connect the heating rods 15a, 15b for supply of electrical energy.
  • a controller of the oven 1 can operate either the outer heating rod 15a or the inner heating rod 15b or both of them in a joint operation, depending on the needed heat input.
  • Both inner and outer heating rods 15a, 15b comprise inner and outer heat portions hp i , hp o , wherein the inner heating portion hp i is ⁇ -shaped and the outer heating portion hp o surrounds the inner heating portion hp i with rectangular shape. That way, a radiant panel heating with uniform two-dimensional heat emission shall be simulated.
  • the top heat heating element 15 is supported by a supporting rod 21, which forms a horizontal support strut fixed between the side walls 11a, 11b and supporting the heating element 15 from below.
  • the supporting rod 21 comprises a fastening lug 23 for its further fixation at the top wall.
  • the oven 1 is also equipped with a temperature sensor 19 penetrating the compartment 3 at the upper left corner of the rear wall 9.
  • the oven 1' according to Fig. 2 is nearly identically constructed as the prior art oven 1.
  • the two ovens 1, 1' illustrated in Figs. 1 and 2 only differ in the design of their heating elements 15, 15'.
  • the heating element 15' of the oven 1' comprises an outer heating rod 15a' and an inner heating rod 15b'.
  • both outer and inner heating rods 15a', 15b' are of a mere rectangular shape and do not comprise any inner heat portion.
  • the rectangular shapes of the outer and the inner heating rods 15a', 15b' are performed in a way that geometrical similarity is provided, so that the outer heating rod 15a' equidistantly surrounds the inner heating rod 15b'.
  • the outer and the inner heating rods 15a', 15b' comprise front, left side, right side and rear heating rod portions f, ls, rs, r, wherein the front heating rod portion f of the outer heating rod 15a' is arranged in parallel to the front heating rod portion f of the inner heating rod 15b' and both front heating rod portions f are spaced from each other in the same way as the left side heating rod portions ls as well as the right side heating rod portions rs of the outer heating rod 15a' and the inner heating rod 15b'.
  • the heating element 15' of the oven 1' is supported by a supporting rod 21', which supporting rod 21' and its centric fastening lug 23' are also fixed to the side walls 11a, 11b and to the top wall as it is in the prior art oven 1.
  • the front, left side and right side heating rod portions are designed with a dimension of at least 220 mm and the outer heating rod 15a'is operable with a power of 0.8 kW and the inner heating rod 15b' is operable with a power of 1.3 kW.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Electric Stoves And Ranges (AREA)
EP20165504.0A 2020-03-25 2020-03-25 Backofen Pending EP3885655A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP20165504.0A EP3885655A1 (de) 2020-03-25 2020-03-25 Backofen

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP20165504.0A EP3885655A1 (de) 2020-03-25 2020-03-25 Backofen

Publications (1)

Publication Number Publication Date
EP3885655A1 true EP3885655A1 (de) 2021-09-29

Family

ID=69960572

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20165504.0A Pending EP3885655A1 (de) 2020-03-25 2020-03-25 Backofen

Country Status (1)

Country Link
EP (1) EP3885655A1 (de)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1154416A (en) * 1914-10-31 1915-09-21 Frank Kuhn Electrically-heated oven.
DE7000378U (de) * 1970-01-07 1970-09-10 Siemens Elektrogeraete Gmbh Einrichtung zur befestigung von heizelementen.
KR20020045876A (ko) * 2000-12-11 2002-06-20 구자홍 전자레인지의 히터
EP2068083A2 (de) * 2007-12-04 2009-06-10 Gorenje Gospodinjski aparati d.d. Heizeinheit eines Ofens
KR20110006893A (ko) * 2009-07-15 2011-01-21 엘지전자 주식회사 조리기기
WO2017085393A1 (fr) * 2015-11-18 2017-05-26 Senaux Jean Michel Dispositif et procede de decongelation, rechauffage et/ou cuisson d'un produit alimentaire

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1154416A (en) * 1914-10-31 1915-09-21 Frank Kuhn Electrically-heated oven.
DE7000378U (de) * 1970-01-07 1970-09-10 Siemens Elektrogeraete Gmbh Einrichtung zur befestigung von heizelementen.
KR20020045876A (ko) * 2000-12-11 2002-06-20 구자홍 전자레인지의 히터
EP2068083A2 (de) * 2007-12-04 2009-06-10 Gorenje Gospodinjski aparati d.d. Heizeinheit eines Ofens
KR20110006893A (ko) * 2009-07-15 2011-01-21 엘지전자 주식회사 조리기기
WO2017085393A1 (fr) * 2015-11-18 2017-05-26 Senaux Jean Michel Dispositif et procede de decongelation, rechauffage et/ou cuisson d'un produit alimentaire

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