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(11) | EP 2 068 083 B1 |
| (12) | EUROPEAN PATENT SPECIFICATION |
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| (54) |
Heating unit of an oven Heizeinheit eines Ofens Unité de chauffage d'un four |
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| Note: Within nine months from the publication of the mention of the grant of the European patent, any person may give notice to the European Patent Office of opposition to the European patent granted. Notice of opposition shall be filed in a written reasoned statement. It shall not be deemed to have been filed until the opposition fee has been paid. (Art. 99(1) European Patent Convention). |
[0001] The present invention refers to the field of household appliances, particularly free-standing and built-in cooking ranges and built-in ovens comprising a upper heating unit comprising at least two tubular heaters. A design of a heating unit of an electric oven and particularly a top broiling unit for use in such an oven has been disclosed in the published document US 3 128 363 A. The disclosed invention is especially adapted for use with a domestic range that has a viewing window in the front edge of the top cooking surface. Two identical tubular heaters extend over the ceiling area almost entirely in a single horizontal plane and are only in the front section bent into two planes. In this manner it is possible for the heaters to maintain the same design and to be fixed to a reflector close to the oven door. Each heater has its own flange and during the assembly, both flanges are jointly fixed to the back of the oven.
Furthermore, the published document US 2 836 697 A discloses teachings about the electric range equipped with electric tubular heating units of the type to provide heat for both baking and broiling operations. Said document teaches how to provide separate heating unit in the upper portion of the oven for broiling operations, and a heating unit in the lower portion of the oven for baking operations. Such a solution requires two separate power supplies and connectors, thus, render the entire solution cost-ineffective.
According to the above mentioned known solutions, the tubular heaters may operate separately or simultaneously, thus resulting in food being unevenly cooked. The drawbacks of such solutions are the relatively inhomogeneous temperature field in the plan view of the oven chamber, the relatively small surface of the upper oven section, the relatively significant influence of heat radiation to undesirable places in the oven, and the relatively significant resistance in the upper section of the oven chamber.
[0002] It is the object of the invention to create a brand new oven which will remedy the drawbacks of known solutions.
[0003] According to the invention, the object as set out above is solved by an oven according to features of the independent claim. According to an embodiment it is preferred that the heater which is arranged closer to the ceiling section of the oven, i.e. the upper heater, is designed with a higher heating power than the second heater being arranged below said upper heater.
[0004] Furthermore, it is provided according to the invention that the interior of the oven is formed in a manner that each of both upper side corners is provided with a chamfer. Here, it has been demonstrated as particularly advantageous if said chamfer comprises an inclination in a range of between 20 to 45 degrees relative to the horizontal.
[0005] In addition, it is provided according to the invention that the distance between each transversal cross-section of the heater and said chamfer is always the same. Thus, the food being cooked in said oven is cooked optimally and uniformly, since the upper tubular heater with a higher heating power is located on the greater distance from the food, being cooked in the oven, compared to the second tubular heater with a lower heating power arranged below said upper heater.
[0006] The invention will be more readily understood on reading the following description with reference to the accompanying drawing where
Fig. 1 shows the cross-section of an oven of a cooking apparatus,
Fig. 2 shows the top view of a heating unit of an oven according to the invention.
[0007] The upper heating unit of an oven according to the invention consists of two tubular heaters 1, 2 arranged one above the other and attached to a common flange 3 being further attached to a back 9 of an oven 5. The tubular heater 1, 2 which lies closer to a ceiling 4 of the oven 5, i.e. the upper tubular heater 1 in the given case, is preferably designed with a higher heating power whereas the second tubular heater 2 of the lower heating power is arranged in a vertical distance under said upper tubular heater 1.
[0008] The interior of the oven 5 is designed in a manner that each of the upper side corners is formed with a chamfer 6 when viewing in the direction from the door towards the back of the oven. Said chamfer 6 comprises an inclination y preferably extending in the range of between 20 and 45 degrees relative to the horizontal. With such a design the homogeneity of the temperature field significantly improves in the plan view of the oven chamber. The surface of the upper section of the oven also increases significantly resulting in an improvement of the heat radiation effect from the walls to the food being cooked in the oven.
[0009] Each cross-section 7, 8 of the tubular heater 1, 2 lies here at the very same distance x from said chamfer 6. Thus, the food being cooked in said oven is cooked optimally and uniformly, since the upper tubular heater 1 with a higher heating power is located on the greater distance from the food, being cooked in the oven, with regard to the second tubular heater 2 with a lower heating power arranged below said upper heater.
1. A heating unit comprised of at least two tubular heaters (1, 2) arranged inside an
oven (5), said oven comprising a ceiling (4) and a back (9), characterized in that the interior of the oven (5) is formed in a manner that each of both upper side corners
is provided with a chamfer (6), the at least two heaters (1,2) each have a cross-section
(7,8) in a transversal plane parallel to the back (9) of the oven, said at least two
tubular heaters (1,2) are vertically spaced apart relatively to each other, and are
attached to the back (9) of the oven (5) by means of a common flange (3), wherein
each cross-section (7, 8) of each of the at least two tubular heaters (1, 2) lies
at the same distance (x) from said chamfer (6).
2. A heating unit according to claim 1 characterized in that the upper heater (1) which is arranged closer to the ceiling section (4) of the oven
(5) is designed with a higher heating power than the second heater (2) being arranged
below said upper heater (1).
3. A heating unit according to any of claims 1 to 2 characterized in that said chamfer (6) is formed with an inclination (y) in a range of between 20 to 45 degrees relative to the horizontal.
1. Heizeinheit, welche wenigstens zwei rohrförmige Heizelemente (1,2) umfasst, die im
Inneren eines Ofens (5) angeordnet sind, wobei der Ofen eine Decke (4) und eine Rückseite
(9) beinhaltet, dadurch gekennzeichnet, dass der Innenraum des Ofens (5) in einer Weise ausgebildet ist, dass jede der zwei oberen
seitlichen Ecken eine Schrägkante (6) aufweist, wobei die wenigstens zwei Heizelemente
(1,2) jeweils einen Querschnitt (7,8) in einer transversalen Ebene parallel zur Rückseite
(9) des Ofens aufweisen, wobei die wenigstens zwei rohrförmigen Heizelemente (1,2)
in Bezug aufeinander vertikal voneinander beabstandet sind und an der Rückseite (9)
des Ofens (5) mittels eines gemeinsamen Flansches (3) befestigt sind, wobei der Querschnitt
(7, 8) von jedem der wenigstens zwei rohrförmigen Heizelemente (1, 2) jeweils in einem
gleichen Abstand (x) von der Schrägkante (6) angeordnet ist.
2. Heizeinheit nach Anspruch 1, dadurch gekennzeichnet, dass das obere Heizelement (1), welches sich näher an dem Deckenabschnitt (4) des Ofens
(5) befindet, mit einer höheren Heizleistung als das zweite Heizelement (2) ausgebildet
ist, welches unterhalb von dem oberen Heizelement (1) angeordnet ist.
3. Heizeinheit nach einem der Ansprüche 1 und 2, dadurch gekennzeichnet, dass die Schrägkante (6) mit einer Neigung (y) in einem Bereich zwischen 20 und 45 Grad
in Bezug auf die Horizontale ausgebildet ist.
1. Unité de chauffage comprenant au moins deux éléments chauffants tubulaires (1, 2)
disposés à l'intérieur d'un four (5), ledit four comprenant un plafond (4) et une
partie arrière (9), caractérisée par le fait que l'intérieur du four (5) est formé de telle sorte que chacun des deux coins latéraux
supérieurs comporte un chanfrein (6), les au moins deux éléments chauffants (1, 2)
ayant chacun une section transversale (7, 8) dans un plan transversal parallèle à
la partie arrière (9) du four, lesdits au moins deux éléments chauffants tubulaires
(1, 2) étant espacés verticalement l'un par rapport à l'autre, et étant fixés à la
partie arrière (9) du four (5) au moyen d'une bride commune (3), chaque section transversale
(7, 8) de chacun des au moins deux éléments chauffants tubulaires (1, 2) se trouvant
à la même distance (x) dudit chanfrein (6).
2. Unité de chauffage selon la revendication 1, caractérisée par le fait que l'élément chauffant supérieur (1) qui est disposé plus proche de la section de plafond
(4) du four (5) est conçu avec une puissance de chauffage plus grande que le second
élément chauffant (2) qui est disposé en dessous dudit élément chauffant supérieur
(1).
3. Unité de chauffage selon l'une quelconque des revendications 1 et 2, caractérisée par le fait que ledit chanfrein (6) est formé avec une inclinaison (y) dans une plage allant de 20 à 45 degrés par rapport à l'horizontale.
REFERENCES CITED IN THE DESCRIPTION
This list of references cited by the applicant is for the reader's convenience only. It does not form part of the European patent document. Even though great care has been taken in compiling the references, errors or omissions cannot be excluded and the EPO disclaims all liability in this regard.
Patent documents cited in the description