EP1559959B1 - Baking oven with a heater / fan assembly - Google Patents
Baking oven with a heater / fan assembly Download PDFInfo
- Publication number
- EP1559959B1 EP1559959B1 EP04380262A EP04380262A EP1559959B1 EP 1559959 B1 EP1559959 B1 EP 1559959B1 EP 04380262 A EP04380262 A EP 04380262A EP 04380262 A EP04380262 A EP 04380262A EP 1559959 B1 EP1559959 B1 EP 1559959B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- rear wall
- panel
- heater
- fan
- chamber
- 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
Links
- 238000010438 heat treatment Methods 0.000 claims description 15
- 230000008878 coupling Effects 0.000 claims description 7
- 238000010168 coupling process Methods 0.000 claims description 7
- 238000005859 coupling reaction Methods 0.000 claims description 7
- 239000000758 substrate Substances 0.000 claims description 5
- 230000002093 peripheral effect Effects 0.000 claims description 2
- 238000009434 installation Methods 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 239000002470 thermal conductor Substances 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24C—DOMESTIC STOVES OR RANGESĀ ; 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 RANGESĀ ; 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 domestic baking oven incorporating a convection assembly with an electric heater, which is provided with a flat support for the electric heater resistor assembled in combination with an air fan for the heat distribution in the baking chamber.
- Domestic baking ovens fitted with an electric heater assembly in the baking chamber, of the type for the convection of the heat generated by a circular-shaped electrical heating resistor, which is associated with a fan mounted at the centre of the rear wall of the chamber, are already known.
- the fan distributes the air heated by the resistor all round the baking chamber, for which purpose additional walls in the chamber form a cooled air intake duct towards the resistor and one or more ducts for impelling the air heated in its flow towards the chamber by the resistor.
- heater assemblies are fitted in the oven chamber by means of the separate individual fixing of component of the heater assembly, the fan, the resistor and its electrical connector, a support bracket for the resistor insulated electrically from the metallic casing of the oven, and the additional walls forming the forced air ducts.
- this type of baking oven are those disclosed in WO-02/39021-A1 , EP-319373-A1 and in GB 1598333 A .
- a domestic baking oven that incorporates a forced air heater, as that disclosed in EP-852317-A1 , whose electrical heating resistor is the type with a thick film deposited on several flat panels, which are arranged in the baking chamber in front of the convector fan and, in addition, form the forced hot air flow delivering and distribution ducts.
- This construction of the convection ducts needs various flat supports for the resistors, which have to be installed in a succession in the oven carrying out a mounting operation separate from that of the fan.
- the components comprised in the convection heater are supplied separately for assembly of the oven, being further fixed individually to the metal structure of the oven, and special means are required for fixing each component, such as for the fan and the resistor panels as well as for the electrical connectors.
- the object of the present invention is a domestic baking oven according to claim 1.
- the heater assembly according to the invention is formed as a separate supply unit, including the convection fan, one or more flat resistors in thermal contact with a panel supporting the resistors which is traversed by the air flow generated from the baking chamber by the fan, and the electrical connection means, so that for its installation it is handled as a single sub-assembly separate from the oven structure, which permits its installation in different domestic baking oven models by means of a single connection device between the fan and the heater panel, which in turn acts as a support for the single heater assembly, fixed directly to the rear wall of the chamber by means of quick-fixing accessories and without the use of additional walls for forming the forced hot air flow force and distribution ducts.
- the heater assembly of the invention has the advantage of being provided with a single resistor substrate-panel, which is completely flat and economical to manufacture, besides providing efficient heating as the circulating air is heated against the two opposing faces of the flat substrate-panel.
- one embodiment of the baking oven 1 comprises a baking chamber 3 formed by means of a vertical rear oven wall 2 and a number of adjacent metallic walls 2a, and a heater assembly 4 fixed on said rear wall 2 in order to generate a flow of forced hot air distributed all round chamber 3.
- the heater assembly 4 comprises a radial blade fan 8 driven by a motor 9 a rotary fan shaft 10 forcing the hot air delivery flow 6, a heater support panel 11, 12 in the form of a flat plate with two sides, a front one 11a and a rear one 11b, bearing on one of them a flat heating resistor 12 in thermal contact with the respective face 11a, 11b, and a single connecting and support device 7 fixed to the rear wall 2, all of them installed as a single sub-assembly 7-12, including the means for electrical connection 16 as well.
- the heater panel 11, 12 carrying the heating resistor 12 is preferably structured as a substantially flat substrate strip 11, on either the front face 11a or rear face 11b of which there is placed in thermal contact a flat resistor or preferably deposited a thick film heating resistor 12, in order to improved thermal transmission to the substrate-panel 11, which is made of a metal sheet coated with an electrical insulating layer which is at the same time a good thermal conductor.
- the heater assembly 4 is mounted on the rear wall 2 of the oven solely by means of the connecting device 7, which is fixed directly to the rear wall 2 of the chamber by means of screws or quick-fastening accessories of the turn-and-lock type, not shown in the drawings.
- the connecting device 7 is made up of a circular central plate 7a which is placed in contact with the rear wall 2, and from its periphery there project a number of radial arms 13 extended in the form of a funnel widening in the direction of the chamber 3, leaving air flow openings 14 between them.
- the central plate 7a is crossed by the rotary shaft 10 of the fan securing it, for purposes of supporting the fan 8 and its motor 9 in the heater assembly.
- the substrate-panel 11 carrying the heating resistor 12 is substantially ring-shaped with an outside diameter referred to in figure 1 as "De", and it is made of a metal sheet, such as of stainless steel having a high strength for coupling to the connecting device 7.
- the annular substrate 11 has a central opening 11c with a diameter "D1" on the edge of which it is supported, connected to the radial arm ends 13a of said coupling device 7, the substrate 11 positioned on a plane parallel to that of rotation of the blades 8 and separated from the rear wall 2 by a space of width "W".
- the length of the fan shaft 10 crossing the space "W" determines an equivalent separation distance between the plane of the blades 8 and the rear wall 2.
- the force flow ducts for a part of the hot air flow supply which is first directed at the baking chamber 3 by way of the hollows 14 between two radial support arms 13, on the rear face 11b of the heating panel 11,12, and then distributed by way of the peripheral space between the heater assembly 4 and the adjacent walls 2a of the oven.
- the circular periphery of the rotary blades 8 is substantially interposed inside the heater panel 11,12, so that a portion of the hot air flow 6 is due to the central intake air flow 5 sucked by the fan 8, which runs over the front face 11a of the heater panel.
- the heater assembly 4 is installed as a single supply sub-assembly on the rear wall 2 of the oven by means of a single operation for fitting the whole heater assembly 4, including the fan motor 9 and its thermal insulation from the oven walls.
- the opening 15 in the rear wall 2 required for this operation has a diameter larger than the diameter "Dm" of motor 9.
- the central support plate 7a has a diameter "Ds" larger than the through-hole opening 15 in the wall, so it is placed in contact with the rear wall 2 internally.
- the electrical connection cables 16 of the heating resistor are run to the outside of the oven by way of the intermediate space "W", guided on the radial arms 13 of the support, thus terminating the heater assembly 4 installation operation in the chamber 3 of the oven.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Baking, Grill, Roasting (AREA)
- Electric Ovens (AREA)
- Electric Stoves And Ranges (AREA)
Description
- The present invention relates to a domestic baking oven incorporating a convection assembly with an electric heater, which is provided with a flat support for the electric heater resistor assembled in combination with an air fan for the heat distribution in the baking chamber.
- Domestic baking ovens, fitted with an electric heater assembly in the baking chamber, of the type for the convection of the heat generated by a circular-shaped electrical heating resistor, which is associated with a fan mounted at the centre of the rear wall of the chamber, are already known. The fan distributes the air heated by the resistor all round the baking chamber, for which purpose additional walls in the chamber form a cooled air intake duct towards the resistor and one or more ducts for impelling the air heated in its flow towards the chamber by the resistor. These heater assemblies are fitted in the oven chamber by means of the separate individual fixing of component of the heater assembly, the fan, the resistor and its electrical connector, a support bracket for the resistor insulated electrically from the metallic casing of the oven, and the additional walls forming the forced air ducts. Examples of this type of baking oven are those disclosed in
WO-02/39021-A1 EP-319373-A1 GB 1598333 A - Also known is a domestic baking oven that incorporates a forced air heater, as that disclosed in
EP-852317-A1 - In known ovens the components comprised in the convection heater are supplied separately for assembly of the oven, being further fixed individually to the metal structure of the oven, and special means are required for fixing each component, such as for the fan and the resistor panels as well as for the electrical connectors.
- The object of the present invention is a domestic baking oven according to claim 1.
- The heater assembly according to the invention is formed as a separate supply unit, including the convection fan, one or more flat resistors in thermal contact with a panel supporting the resistors which is traversed by the air flow generated from the baking chamber by the fan, and the electrical connection means, so that for its installation it is handled as a single sub-assembly separate from the oven structure, which permits its installation in different domestic baking oven models by means of a single connection device between the fan and the heater panel, which in turn acts as a support for the single heater assembly, fixed directly to the rear wall of the chamber by means of quick-fixing accessories and without the use of additional walls for forming the forced hot air flow force and distribution ducts.
- In respect of the known forced convection heaters that use several panels with flat or thick film resistors, the heater assembly of the invention has the advantage of being provided with a single resistor substrate-panel, which is completely flat and economical to manufacture, besides providing efficient heating as the circulating air is heated against the two opposing faces of the flat substrate-panel.
- Compared with known forced convection heaters using ring-shaped tubular type heating resistors it is an advantage of the heater assembly of the invention that its flat resistor has low thermal mass, so that the baking chamber is saved from an excessive rise in temperature due to thermal inertia and at the same time rapid heating of the chamber is generated by means of a small electrical output.
-
-
Figure 1 is a front view of a convection heater assembly installed in a baking oven. -
Figure 2 is a cross-sectional view of the heater assembly according to line II-II infigure 1 . - In reference to
FIGS. 1 and 2 , one embodiment of the baking oven 1 comprises abaking chamber 3 formed by means of a verticalrear oven wall 2 and a number of adjacentmetallic walls 2a, and a heater assembly 4 fixed on saidrear wall 2 in order to generate a flow of forced hot air distributed allround chamber 3. The heater assembly 4 comprises aradial blade fan 8 driven by a motor 9 arotary fan shaft 10 forcing the hotair delivery flow 6, aheater support panel flat heating resistor 12 in thermal contact with therespective face rear wall 2, all of them installed as a single sub-assembly 7-12, including the means forelectrical connection 16 as well. - The
heater panel heating resistor 12 is preferably structured as a substantiallyflat substrate strip 11, on either thefront face 11a orrear face 11b of which there is placed in thermal contact a flat resistor or preferably deposited a thickfilm heating resistor 12, in order to improved thermal transmission to the substrate-panel 11, which is made of a metal sheet coated with an electrical insulating layer which is at the same time a good thermal conductor. - The heater assembly 4 is mounted on the
rear wall 2 of the oven solely by means of the connecting device 7, which is fixed directly to therear wall 2 of the chamber by means of screws or quick-fastening accessories of the turn-and-lock type, not shown in the drawings. The connecting device 7 is made up of a circularcentral plate 7a which is placed in contact with therear wall 2, and from its periphery there project a number ofradial arms 13 extended in the form of a funnel widening in the direction of thechamber 3, leavingair flow openings 14 between them. Thecentral plate 7a is crossed by therotary shaft 10 of the fan securing it, for purposes of supporting thefan 8 and itsmotor 9 in the heater assembly. - The substrate-
panel 11 carrying theheating resistor 12 is substantially ring-shaped with an outside diameter referred to infigure 1 as "De", and it is made of a metal sheet, such as of stainless steel having a high strength for coupling to the connecting device 7. Theannular substrate 11 has acentral opening 11c with a diameter "D1" on the edge of which it is supported, connected to theradial arm ends 13a of said coupling device 7, thesubstrate 11 positioned on a plane parallel to that of rotation of theblades 8 and separated from therear wall 2 by a space of width "W". The length of thefan shaft 10 crossing the space "W" determines an equivalent separation distance between the plane of theblades 8 and therear wall 2. - Between both the
rear wall 2 of the oven and thesubstrate 11, are formed the force flow ducts for a part of the hot air flow supply, which is first directed at thebaking chamber 3 by way of thehollows 14 between tworadial support arms 13, on therear face 11b of theheating panel adjacent walls 2a of the oven. On account of their diameter "Df" smaller than the diameter "Di" of the opening 11c, the circular periphery of therotary blades 8 is substantially interposed inside theheater panel hot air flow 6 is due to the centralintake air flow 5 sucked by thefan 8, which runs over thefront face 11a of the heater panel. - The heater assembly 4 is installed as a single supply sub-assembly on the
rear wall 2 of the oven by means of a single operation for fitting the whole heater assembly 4, including thefan motor 9 and its thermal insulation from the oven walls. For mounting the heater assembly 4 is inserted from the mouth of the chamber passing themotor 9 to the outside of the oven. The opening 15 in therear wall 2 required for this operation has a diameter larger than the diameter "Dm" ofmotor 9. Thecentral support plate 7a has a diameter "Ds" larger than the through-hole opening 15 in the wall, so it is placed in contact with therear wall 2 internally. Owing to this arrangement of the heater assembly 4 on therear wall 2, theelectrical connection cables 16 of the heating resistor are run to the outside of the oven by way of the intermediate space "W", guided on theradial arms 13 of the support, thus terminating the heater assembly 4 installation operation in thechamber 3 of the oven.
Claims (6)
- Domestic baking oven provided with an electric heater assembly (4) for heating the oven chamber (3) of the type employing the convection of a hot air flow (6) generated by way of a flat electrical resistor (12), the baking oven (1) comprising a rear wall (2) and a number of adjacent chamber walls (2a), a convection fan (8,9,10) having a motor (9) and a rotary shaft (10) at least one panel (11) for supporting the heating resistor (12), and means (7a, 13a) for connecting the fan (8,9,10) and the at least one panel (11) to said chamber walls (2,2a), wherein a hot air flow (6) is forced and distributed across the oven chamber (3) by means of a duct made up of said walls (2,2a) and the at least one panel (11), wherein the heater assembly (4) is provided with a single panel (11) for supporting the electrical resistor (12), which is substantially flat and arranged parallel to said rear wall (2), bein separated from the latter by a given space width W, characterised in that the electrical resistor (12) is ring-shaped, the convection fan (8, 9, 10) is mounted in the centre of the rear wall (2), the heater assembly (4) is provided with a device (7) for coupling both the fan (8) and its motor (9) and the at least one panel (11), as a single support means of the heater assembly (4) on the rear wall (2), whereby the heater assembly (4) is built as a subassembly (7-10) mountable as a whole in a single operation directly on the rear wall (2) of the chamber.
- The baking oven of claim 1, wherein said device (7) for coupling and supporting the heater assembly (4) is provided with a central plate (7a) fixed to the rear wall (2) of the chamber, and with means (13, 14) for coupling the at least one heater panel (11,12) to said central plate (7a) separated from the latter by said space width "W", so forming a duct for impelling an air flow between said rear wall (2) and the at least one heater panel (11,12).
- The baking oven of claim 1, wherein said device (7) coupling and supporting the heater assembly (4) is provided with a central plate (7a) fixed to the rear wall (2) of the chamber and with a number of radial arms (13) extended in the direction of the chamber (3) supporting the at least one heater panel (11,12) separated by said space width "W" from the rear wall, forming a duct for impelling said air flow (6) between said rear wall (2) and the at least one heater panel (11, 12).
- The baking oven of claim 1, wherein said heater panel (11,12) has a central opening (11c) in which the radial convection fan (8) blade rotation plane is interposed, separated from the rear wall (2) by its rotary shaft (10) for forcing the air flow (6) up against both faces of the at least one heater panel (11,12).
- The baking oven of claim 1, wherein said at least one heater panel (11,12) takes the form of flat plate provided with a central opening (11c) for the interposition of the fan (8) rotation blades and a peripheral edge (13a) for its support by means of said heater assembly coupling device (7).
- The baking oven of claim 1, wherein said at least one heater panel (11,12) supporting the electrical resistor (12) takes the form of a metallic substrate-sheet (11) with two front (11a) and rear (11b) heating surfaces and the electrical resistor (12) is the type comprising a thick film deposited on a surface (11a, 11b), and with a central opening (11c) in the heating substrate in which the rotation plane of the fan (8) blades is interposed, so the air flow (5,6) generated by the fan (8) is heated on both surfaces (11a, 11b) of the substrate-sheet.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ES200400194A ES2242521B1 (en) | 2004-01-30 | 2004-01-30 | DOMESTIC COOKING OVEN WITH A CONVECTION HEATING GROUP. |
ES200400194P | 2004-01-30 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP1559959A2 EP1559959A2 (en) | 2005-08-03 |
EP1559959A3 EP1559959A3 (en) | 2006-05-31 |
EP1559959B1 true EP1559959B1 (en) | 2012-07-04 |
Family
ID=34639547
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP04380262A Not-in-force EP1559959B1 (en) | 2004-01-30 | 2004-12-16 | Baking oven with a heater / fan assembly |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP1559959B1 (en) |
ES (2) | ES2242521B1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US11852349B2 (en) | 2021-03-11 | 2023-12-26 | Electrolux Home Products, Inc. | Convection heating element |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2008103372A2 (en) * | 2007-02-20 | 2008-08-28 | Thermoceramix Inc. | Gas heating apparatus and methods |
DE102009026645B4 (en) * | 2009-06-02 | 2015-03-12 | BSH Bosch und Siemens HausgerƤte GmbH | Cooking appliance |
ES2408508B1 (en) * | 2011-10-25 | 2014-04-15 | BSH ElectrodomƩsticos EspaƱa S.A. | Home Appliance Device |
CN111449095A (en) * | 2020-04-17 | 2020-07-28 | ęå·ä½åøęÆå·„äøęéå ¬åø | High-power oven heater |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3529582A (en) * | 1968-12-09 | 1970-09-22 | Gen Electric | Self-cleaning forced convection oven |
GB1598333A (en) * | 1977-12-09 | 1981-09-16 | Moffat R | Electrical heating device for a food-containing unit |
JPS6016244A (en) * | 1984-06-07 | 1985-01-28 | Matsushita Electric Ind Co Ltd | Heating cooker |
IT1220754B (en) * | 1988-06-01 | 1990-06-21 | Zanussi Grandi Impianti Spa | FORCED CONVECTION GAS COOKING OVEN |
US4928663A (en) * | 1989-01-31 | 1990-05-29 | Bakers Pride Oven Co. | Enhanced air-flow convection oven |
US5404420A (en) * | 1993-08-10 | 1995-04-04 | Song; Eugene | Cooking oven using far-infrared tube heater |
EP0852317B1 (en) * | 1998-03-27 | 2003-10-29 | Electrolux AG | Cooking chamber with an air inlet and a heating element arrangement |
WO2002039021A1 (en) * | 2000-11-08 | 2002-05-16 | Ron Wilson | Domestic oven heating element |
-
2004
- 2004-01-30 ES ES200400194A patent/ES2242521B1/en not_active Expired - Fee Related
- 2004-12-16 EP EP04380262A patent/EP1559959B1/en not_active Not-in-force
- 2004-12-16 ES ES04380262T patent/ES2386281T3/en active Active
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US11852349B2 (en) | 2021-03-11 | 2023-12-26 | Electrolux Home Products, Inc. | Convection heating element |
Also Published As
Publication number | Publication date |
---|---|
EP1559959A2 (en) | 2005-08-03 |
ES2386281T3 (en) | 2012-08-16 |
ES2242521B1 (en) | 2006-10-01 |
EP1559959A3 (en) | 2006-05-31 |
ES2242521A1 (en) | 2005-11-01 |
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