EP2372249B1 - Ofen - Google Patents

Ofen Download PDF

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Publication number
EP2372249B1
EP2372249B1 EP10003651.6A EP10003651A EP2372249B1 EP 2372249 B1 EP2372249 B1 EP 2372249B1 EP 10003651 A EP10003651 A EP 10003651A EP 2372249 B1 EP2372249 B1 EP 2372249B1
Authority
EP
European Patent Office
Prior art keywords
oven
heating
impression
heating loop
extension
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.)
Not-in-force
Application number
EP10003651.6A
Other languages
English (en)
French (fr)
Other versions
EP2372249A1 (de
Inventor
Gerhard Schäff
Dietmar Hildner
Tobias Weber
Bernd Heisswolf
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 Home Products Corp NV
Original Assignee
Electrolux Home Products Corp NV
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 Home Products Corp NV filed Critical Electrolux Home Products Corp NV
Priority to EP10003651.6A priority Critical patent/EP2372249B1/de
Publication of EP2372249A1 publication Critical patent/EP2372249A1/de
Application granted granted Critical
Publication of EP2372249B1 publication Critical patent/EP2372249B1/de
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • 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 ovens, especially household ovens comprising an oven muffle with a muffle wall defining an oven cavity and a heating loop for heating the oven cavity.
  • the heating loop is fixedly mounted onto to the muffle wall in a fixing region of the heating loop, where the fixing region is adjacent to the current entry and the current exit provided through the muffle wall for delivering electrical power to the heating loop.
  • the heating loop comprises at least one spacer mounted onto the heating loop outside the fixing region for maintaining a predetermined minimum distance between the heating loop and the muffle wall.
  • a problem related to such conventional ovens is that due to the temperature cycling of the heating loop and the related thermal stress an unwanted lateral displacement of the center of heating loop parallel the muffle wall can occur. This cannot only result in reversible displacement but also - especially after many temperature cycles - a constant displacement of the heating loop can remain. Since such a heating loop is usually rather close to a fan for circulating the hot air within the interior cavity of the oven muffle a predetermined minimum distance between heating loop and fan or a fan cover could be undershot. This can result in a damage of these parts or at least impair the baking results.
  • a spacer connected to the heating loop for maintaining a predetermined minimum distance between the heating loop and the muffle wall comprises an extension directed towards the muffle wall.
  • the muffle wall comprises an elongated impression positioned relative to the extension so as to receive the extension.
  • the impression is designed so as to enable at most limited lateral displacement of the heating loop arising under working conditions of the oven. This means that the extension of the spacer will abut against the lateral limitation of the impression in the case of a lateral displacement of the heating loop.
  • the impression may have a lateral width being in the range of the width of the cross-section of the extension of the spacer in the same direction, preferably being between said width of the extension and twice said width.
  • the orientation of the elongated impression is in a first direction, which is in particular perpendicular to an adjacent section of the heating loop, so as to allow a sliding movement of the extension within the elongated impression in this first direction.
  • the heating loop is hence allowed to perform a movement relative to the muffle and along the muffle wall in this first direction.
  • a movement of the extension and hence the heating loop in a second direction parallel to the adjacent section of the heating loop along the muffle wall is suppressed.
  • the heating loop is free to move in an outward and inward first direction (in a radial direction) so as to perform a certain expansion or contraction movement due to thermal expansion or thermal contraction of the loop material.
  • a lateral displacement of the complete heating loop with its center relative to the muffle wall and along the said second direction is blocked or merely slightly possible since the extension can only move along the elongated impression but not or only slightly cross-wise.
  • the at least one spacer can be mounted on a side of the heating loop opposite to the fixing region of the heating loop. This provides the most effective and easiest support of the heating loop for avoiding a contact between the heating loop and the muffle wall. The orientation of the elongated impression is then along the (imaginary) line connecting the fixing region with the spacer.
  • the heating loop has a circular footprint and consists of at least one heating coil. This has, amongst others, the advantage that thermal expansion or contraction is directed in a radial direction and it is hence easier to control the thermal movement of the heating coil.
  • the orientation of the elongated impression is in radial direction with respect to the heating coil and hence allows a radial expansion or radial contraction of the heating coil due to the thermal expansion or thermal contraction of the heating coil and on the other hand suppresses a lateral movement of the whole heating coil in a lateral direction (i.e. a movement of the coil center in a direction perpendicular to a line connecting the fixing area of the heating coil with the center of the coil).
  • the muffle wall comprises a first impression for receiving the heating coil, which in case of a circular heating coil is a respective circular impression and the elongated impression for receiving the extension of the spacer is impressed as a second, further elongated impression into this first impression.
  • the fixing region within which the heating coil is fixed to the muffle wall is smaller than 90° and more preferably smaller than 45° of the whole heating coil so that the thermal expansion or thermal contraction is not disturbed in the remaining larger area of the heating coil.
  • the spacer is formed as a bracket which is clipped or otherwise fixed onto the heating loop.
  • the heating loop is mounted onto a rear muffle wall of the oven cavity.
  • the elongated impression needs to be longer than the length of the cross-section of the extension in the same direction, preferably it has a length in a radial direction with respect to the heating loop of several lengths of the length of the cross-section of the extension in the same direction, most preferably it is at least 3 times longer than said length.
  • Fig. 1 shows a muffle rear wall element 10 for an oven according to the present invention.
  • Muffle rear wall 10 comprises a circular impression 12, which is adapted for receiving a circular heating coil 20 being not yet mounted.
  • an elongated impression 14 is provided, which is a further impression on the bottom of the first circular impression 12 and which is like the circular impression 12 directed in a direction outward the oven cavity, which means into a direction of the rear side of the oven.
  • a fixing region 16 is provided in the ear wall 10 for receiving a heating coil and providing electrical contact to that heating coil.
  • Fig. 2 shows (on the left side) the muffle rear wall 10 of Fig. 1 where now a fan 18 and a heating coil 20 are mounted.
  • Heating coil 20 has a center 30 and is fixed by means of two screws 28 to the muffle rear wall 10 in a fixing region of the heating coil 22 where heating coil 20 is contacted on its ends with a current entry and a current exit provided through the muffle rear wall for delivering electrical power to the heating loop.
  • Fixing region 22 of the heating coil 20 can be formed as a plug with two contacts for contacting both ends of the heating coil with a connector in or behind the rear wall 10 and where the screws 28 are provided for an additionally fixing the plug-like fixing region 22 of the heating coil 20 with the muffle rear wall 10.
  • bracket 24 is clipped onto the heating coil 20 so as to maintain a predetermined minimum distance between the heating coil 20 and the muffle wall 10.
  • This bracket 24 is clipped or can be otherwise fixed onto the heating coil 20 in a section opposite to the fixing region 22 of the heating coil 20 so that an optimum leverage is provided for supporting the heating coil 20 against movements towards the rear wall 10.
  • a further enlargement of this enlarged cross-section is shown left from the first enlargement.
  • bracket 24 comprises an extension 26, which is directed towards the rear wall 10.
  • Extension 26 extends into the elongated impression 14 of the muffle rear wall 10, which is dimensioned such that a certain radial (with respect to center 30) movement of the extension 26 along the elongated impression 14 is possible (typically in a range of up to 5 cm, more preferably up to 2 cm).
  • a certain radial (with respect to center 30) movement of the extension 26 along the elongated impression 14 is possible (typically in a range of up to 5 cm, more preferably up to 2 cm).
  • the dimension of elongated impression 14 in a direction perpendicular to the longitudinal extension is so narrow that, although a sliding movement of the extension along the longitudinal extension of elongated impression 14 is still possible, a lateral movement is suppressed.
  • bracket 24 and its extension 26 forms a spacer so as to inhibit a movement of the heating coil 20 towards rear wall 10 so that a predetermined minimum distance between the heating coil and the rear muffle wall 10 is maintained.
  • the heating coil 20 is mounted under a pre-load pressing the heating coil 20 and in particular the bracket 24 against the muffle wall 10.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Muffle Furnaces And Rotary Kilns (AREA)
  • General Induction Heating (AREA)

Claims (16)

  1. Ofen, umfassend eine Ofenmuffel mit einer Muffelwand (10), die eine Ofenkammer definiert, und einer Heizschleife (20),
    wobei die Heizschleife (20) fest auf der Muffelwand (10) in einer Befestigungsregion (22) der Heizschleife (20) montiert ist, wobei die Befestigungsregion (22) sich neben einem Stromeintrag und einem Stromaustrag befindet, die durch die Muffelwand bereitgestellt werden, um der Heizschleife (20) elektrische Energie bereitzustellen, und wobei die Heizschleife (20) mindestens ein Distanzstück (24) umfasst, das auf der Heizschleife außerhalb der Befestigungsregion (22) montiert ist, um einen vorbestimmten Mindestabstand zwischen der Heizschleife und der Muffelwand (10) aufrechtzuerhalten, und wobei das Distanzstück (24) eine Verlängerung (26) umfasst, die zu der Muffelwand (10) gerichtet ist, dadurch gekennzeichnet, dass
    die Muffelwand (10) eine Vertiefung (14) umfasst, die relativ zu der Verlängerung (26) positioniert ist, um so die Verlängerung (26) aufzunehmen, wobei die Vertiefung (14) so konzipiert ist, dass höchstens begrenzte seitliche Verschiebung der Heizschleife möglich ist, zu der es unter Arbeitsbedingungen des Ofens kommt, wobei die Vertiefung (14) länglich und so bemessen ist, dass eine gleitende Bewegung der Verlängerung (26) innerhalb der länglichen Vertiefung (14) relativ zu und entlang der Muffelwand in einer ersten radialen Richtung (A) auswärts und einwärts möglich ist, um so Wärmeexpansion oder -kontraktion des Schleifenmaterials durchzuführen und eine Bewegung der Verlängerung (26) in einer Richtung (B) parallel zu einem benachbarten Abschnitt der Heizschleife (20) zu unterdrücken.
  2. Ofen nach Anspruch 1, wobei die Vertiefung (14) eine seitliche Breite im Bereich der Breite des Querschnitts der Verlängerung (26) in derselben Richtung hat, vorzugsweise zwischen der Breite der Verlängerung (26) und der doppelten Breite derselben.
  3. Ofen nach Anspruch 1 oder 2, wobei die erste Richtung (A) senkrecht zu einem benachbarten Abschnitt der Heizschleife (20) ist.
  4. Ofen nach einem der vorhergehenden Ansprüche, wobei ein Distanzstück (24) an einer Seite der Heizschleife (20) gegenüber der Befestigungsregion (22) der Heizschleife montiert ist.
  5. Ofen nach einem der vorhergehenden Ansprüche, wobei die Heizschleife eine kreisförmige Grundfläche hat und aus mindestens einer Heizspirale (20) besteht.
  6. Ofen nach Anspruch 5, wobei die Orientierung der länglichen Vertiefung (14) in Bezug zu der Heizspirale (20) radial ist, wodurch eine radiale Expansion oder eine radiale Kontraktion der Heizspirale infolge von thermischer Expansion oder thermischer Kontraktion der Heizspirale ermöglicht wird und eine seitliche Bewegung der Heizspirale (20) unterdrückt wird.
  7. Ofen nach Anspruch 6, wobei die Muffelwand (10) eine kreisförmige Vertiefung (12) zum Aufnehmen der Heizspirale (20) umfasst, und wobei die längliche Vertiefung (14) in die kreisförmige Vertiefung (12) eingeprägt ist.
  8. Ofen nach Anspruch 7, wobei die kreisförmige Vertiefung (12) in einer Richtung zu der Außenseite in Bezug auf die Ofenkammer der Muffelwand (10) eingeprägt ist.
  9. Ofen nach einem der Ansprüche 5 bis 8, wobei die Befestigungsregion (22) der Heizspirale (20) einen Abschnitt bedeckt, der kleiner als 90° der Grundfläche der Heizspirale (20) ist.
  10. Ofen nach Anspruch 9, wobei die Befestigungsregion (22) der Heizspirale (20) einen Abschnitt bedeckt, der kleiner als 45° der Grundfläche der Heizspirale (20) ist.
  11. Ofen nach einem der Ansprüche 3 bis 10, wobei die längliche Vertiefung (14) in einer Richtung zu der Außenseite in Bezug auf die Ofenkammer der Muffelwand (10) eingeprägt ist.
  12. Ofen nach einem der vorhergehenden Ansprüche, wobei das Distanzstück eine Klammer (24) ist, die auf die Heizschleife (20) geklemmt ist.
  13. Ofen nach einem der vorhergehenden Ansprüche, wobei die Muffelwand, auf der die Heizschleife (20) montiert werden soll, eine hintere Muffelwand (10) ist.
  14. Ofen nach einem der vorhergehenden Ansprüche, wobei ein einzelnes Distanzstück (24) auf die Heizschleife (20) montiert wird.
  15. Ofen nach einem der Ansprüche 3 bis 14, wobei die längliche Vertiefung (14) eine Längsausdehnung hat, die länger als die Länge des Querschnitts der Verlängerung (26) in derselben Richtung ist, vorzugsweise mindestens das 3-fache der Länge.
  16. Ofen nach einem der vorhergehenden Ansprüche, wobei die Heizschleife (20) in der Region der Platzierung des Distanzstücks (24) gegen die Muffelwand (10) gepresst wird, insbesondere durch eine Vorlast, die in die Region der befestigten Montage der Heizschleife (20) eingebracht wird.
EP10003651.6A 2010-04-01 2010-04-01 Ofen Not-in-force EP2372249B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP10003651.6A EP2372249B1 (de) 2010-04-01 2010-04-01 Ofen

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP10003651.6A EP2372249B1 (de) 2010-04-01 2010-04-01 Ofen

Publications (2)

Publication Number Publication Date
EP2372249A1 EP2372249A1 (de) 2011-10-05
EP2372249B1 true EP2372249B1 (de) 2017-10-11

Family

ID=43859648

Family Applications (1)

Application Number Title Priority Date Filing Date
EP10003651.6A Not-in-force EP2372249B1 (de) 2010-04-01 2010-04-01 Ofen

Country Status (1)

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EP (1) EP2372249B1 (de)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2721695A3 (fr) * 1994-06-28 1995-12-29 Whirlpool Europ Four de cuisson comportant un élément chauffant électrique, amovible aux fins d'un nettoyage.
US6097003A (en) * 1998-01-09 2000-08-01 Emerson Electric Company Support bar attachment for an electric heater element

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5843665B2 (ja) * 1978-10-26 1983-09-28 松下電器産業株式会社 電気調理器
US4629865A (en) * 1985-01-23 1986-12-16 Raytheon Company Electric oven with improved broiler
US4752664A (en) * 1985-07-05 1988-06-21 Sharp Kabushiki Kaisha Microwave oven with a removably attached heater
DE3528696C1 (de) * 1985-08-09 1986-09-04 Bosch-Siemens Hausgeräte GmbH, 8000 München Einrichtung zur Heizstabhalterung
AU1367802A (en) * 2000-11-08 2002-05-21 Ron Wilson Domestic oven heating element
US6949720B1 (en) * 2004-04-01 2005-09-27 Distintive Applicances, Inc. Bottom electric heating element system for ovens
ES2363389B1 (es) * 2006-12-29 2012-06-13 Bsh Electrodomésticos España, S.A. Elemento de sujecion de un calentador tubular, sistema de fijacion con dicho elemento de sujecion y maquina lavadora con dicho sistema de sujecion.
KR20080073860A (ko) * 2007-02-07 2008-08-12 엘지전자 주식회사 조리 기기용 히터 서포터 및 이를 이용한 조리 기기

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2721695A3 (fr) * 1994-06-28 1995-12-29 Whirlpool Europ Four de cuisson comportant un élément chauffant électrique, amovible aux fins d'un nettoyage.
US6097003A (en) * 1998-01-09 2000-08-01 Emerson Electric Company Support bar attachment for an electric heater element

Also Published As

Publication number Publication date
EP2372249A1 (de) 2011-10-05

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