WO2009079728A2 - Kitchen electrical oven - Google Patents
Kitchen electrical oven Download PDFInfo
- Publication number
- WO2009079728A2 WO2009079728A2 PCT/BR2008/000371 BR2008000371W WO2009079728A2 WO 2009079728 A2 WO2009079728 A2 WO 2009079728A2 BR 2008000371 W BR2008000371 W BR 2008000371W WO 2009079728 A2 WO2009079728 A2 WO 2009079728A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- cooking chamber
- baffle case
- wall portion
- electrical
- fact
- Prior art date
Links
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 refers to a kitchen electrical oven, usually intended to household usage and comprising a casing that defines, within it, a cooking chamber to which a baffle case is associated having air inlet and air outlet openings with the cooking chamber and housing an electrical resistance and a fan which is actuated, during the electrical oven operation, to produce an air flow from cooking chamber, through the air inlet openings, electrical resistance and air outlet openings, back to the cooking chamber, giving the oven a forced convection feature.
- Some prior art electrical ovens use a pyrolytic function to effect self- cleaning of cooking chamber inside.
- This known pyrolytic function consists in a system of permanent cleaning that reduces to a fine ash any food or fat residue aggregate to the surfaces in contact with the cooking chamber, which ash can be simply swept or brushed out of the cooking chamber when the pyrolytic cleaning operation is completed.
- this technical solution requires temperatures application around 500 C during periods of 2 to 3 hours, which expends energy and generates odors in environment where the electrical oven is installed.
- the construction of the electrical oven should be done so that its component parts, including the material that forms the casing walls in contact with the cooking chamber to be conducted to too high temperatures, should be designed in order to resist these temperature conditions they are periodically subjected during all service life of electrical oven.
- the inner surfaces of cooking chamber that are closer to the electrical resistance, are the lower, top and side walls of cooking chamber.
- the electrical resistance heats these surfaces mainly by heat irradiation wherein they generally exceed the temperature threshold supported by coating "Nanoclean", making then said coating application impracticable.
- an electrical oven provision of the type defined in the present specification introduction and that comprises a reflector means of thermal irradiation provided inside baffle case, between electrical resistance and a wall portion of baffle case defined between an electrical resistance and the cooking chamber; and an anti-adherent coating applied to the surfaces of casing and baffle case faced to the inside of cooking chamber.
- Figure 1 represents a view in front and simplified perspective of an electrical oven casing, without usual front door and bearing a baffle case in its rear wall;
- Figure 2 represents a view in central vertical cross section of baffle case mounted inside casing, of figure 1 , partially illustrated;
- Figure 3 represents a view in vertical and simplified cross section of casing, said section has been taken as per line Ill-Ill in figure 2;
- Figure 4 represents a view in partially sectioned and external front perspective of baffle case bearing a reflector means of thermal irradiation. Detailed description of the invention
- the invention concerns to a kitchen electrical oven, of the type that comprises a casing 10, usually parallelepipedic, built from any suitable material, generally in metallic plate suitably treated and internally defining a cooking chamber CC.
- the casing 10, of generally parallelepipedic shape has a top wall 11 , a lower wall 12, a pair of side walls 13 and a rear wall 14.
- the casing front region 10 is usually open to be closed by a door of any suitable construction and that is not illustrated in the attached drawings for not pertaining to the present invention.
- the concerned electrical oven still comprises a baffle case 20 usually from metallic plate and in the illustrated configuration comprises a tubular side wall 21 , protruding from rear wall 14 of casing 10, to the inside of cooking chamber CC and yet a portion of front wall 22 closing a free end of tubular side wall 21.
- the tubular side wall portion 21 of baffle case 20 presents a truncated-cone shape with the minor base defined and closed by the front wall portion 22 that in this case takes the circular shape, wherein the tubular side wall 21 yet embodies, in its base end, an external peripherical flange 23 to be seated and attached against the casing 10 rear wall 14.
- the tubular side wall 21 has a plurality of air outlet openings 21a, disposed radially and angularly spaced from one another, wherein the front wall portion 22 has an air inlets openings assembly 22a disposed axial and centrally, wherein in the illustrated constructive example, the air openings assembly 22a is defined by a plurality of borings made in the front wall portion 22, defining a kind of screen to the air axial inlet from cooking chamber CC inside to the baffle case 20 inside.
- baffle case 20 can be defined with its front wall portion 22 coplanar to the rear wall 14 of the casing 10, in which condition tubular side wall portion
- baffle case 20 begins to protrude behind the rear wall 14 of the casing
- the baffle case 20 front wall portion 22 begins to exhibit not only the air inlet openings assembly 22a but also a plurality of eccentric openings, to define the air outlet openings 21a.
- an electrical resistance 30 is mounted, of tubular annular shape, disposed slightly away from front wall portion 22, around the air inlet openings assembly 22a.
- the baffle case 20 still houses a fan 40 of centrifugal type and coax- ial to the electrical resistance 30 and that is actuated by an electrical motor "M" shown in figure 2, placed rearwardly to the casing 10 rear wall 14, wherein the fan is sized to produce a forced air flow in cooking chamber CC, through air inlet openings 22a, electrical resistance 30 and air outlet openings 21a, back to the cooking chamber CC.
- M electrical motor
- fan 40 produces a forced air convection, sucking it axially from cooking chamber CC, passing it by the electrical resistance 30 inside the baffle case 20, heating said air flow and giving it back to the cooking chamber CC inside through the air outlet openings 21 a.
- a thermal irradiation reflector means 50 is provided inside the baffle case 20, placed between electrical resistance 30 and a wall portion of baffle case 20, defined between the electrical resistance 30 and the cooking chamber CC, wherein in the illustrated configuration, said wall portion is defined by front wall portion 22.
- the thermal irradiation reflector means 50 is built so as to reflect thermal irradiation produced by electrical resistance 30 back to the baffle case 20 inside, preventing wall portion 22 of baffle case 20 adjoining to the electrical resistance 30, from being heated to temperatures of about 300 0 C or higher.
- irradiation reflector means 50 is placed only between front wall portion 22 and electrical resistance 30, being able to take the shape of a reflector metallic plate, seated and attached against said front wall portion 22 of baffle case 20. It should be understood that thermal irradiation reflector means 50 can be defined in own inner face of front wall portion 22 of baffle case 20 faced to the electrical resistance or be defined by an inner coating of said front wall portion 22 of the baffle case 20, said inner coating being able to be in the shape of a reflective film applied to said front wall portion 22 of the baffle case 20.
- the herein proposed construction allows keeping temperature of wall portions 21 , 22 of baffle case 20 in temperatures below 300° C, even though said wall portions are adjoining to electrical resistance 30, since the irradiated heat from this latter is reflected from baffle case 20 inside, not heating excessively the metallic structure of this latter. So, it is possible to apply to the inner surfaces of cooking chamber CC an anti-adherent coating 60, for instance, that known by trademark "Nanoclean", making the inner surface of the cooking chamber CC self-cleaner or at least of extremely easier cleaning by non-adherent features of said coating 60.
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Electric Stoves And Ranges (AREA)
Abstract
The invention provides a kitchen electrical oven comprising: a casing (10) defining a cooking chamber (CC); a baffle case (20) comprising wall portions (21, 22) mounted to the casing (10) and having air inlet and outlet openings (22a, 21a) in direct communication with the cooking chamber (CC); a electrical resistance (30); and a fan (40) mounted inside the baffle case (20), so that a forced air flow can be produced from cooking chamber (CC), through electrical resistance (30) and back to cooking chamber (CC). A thermal irradiation reflector means (50) is provided inside the baffle case (20) between electrical resistance (30) and a wall portion (22) of the baffle case (20), allowing the application of an anti-adherent coating (60) to the surfaces of the casing (10) and baffle case (20) faced to the cooking chamber (CC) inside.
Description
Title: "KITCHEN ELECTRICAL OVEN"
Field of the invention
The present invention refers to a kitchen electrical oven, usually intended to household usage and comprising a casing that defines, within it, a cooking chamber to which a baffle case is associated having air inlet and air outlet openings with the cooking chamber and housing an electrical resistance and a fan which is actuated, during the electrical oven operation, to produce an air flow from cooking chamber, through the air inlet openings, electrical resistance and air outlet openings, back to the cooking chamber, giving the oven a forced convection feature. Background of the invention
It is known that one of the drawbacks in the operation of electrical ovens for food cooking refers to the periodic cleaning of the oven inside, through the application of degreasing products and abrasive manual effort to the withdrawal of food residues and fat that are unavoidably settled on the surfaces of oven casing and baffle case, faced to the interior of cooking chamber.
Even considering an usual application of enameled coating in said surfaces in contact with the cooking chamber, the deposition of food residues and fat in said surfaces is unavoidable, requiring undesired and burdensome cleaning operations by the user, usually the household user.
Some prior art electrical ovens use a pyrolytic function to effect self- cleaning of cooking chamber inside. This known pyrolytic function consists in a system of permanent cleaning that reduces to a fine ash any food or fat residue aggregate to the surfaces in contact with the cooking chamber, which ash can be simply swept or brushed out of the cooking chamber when the pyrolytic cleaning operation is completed. However, this technical solution requires temperatures application around 500 C during periods of 2 to 3
hours, which expends energy and generates odors in environment where the electrical oven is installed. It should be also noted that the construction of the electrical oven should be done so that its component parts, including the material that forms the casing walls in contact with the cooking chamber to be conducted to too high temperatures, should be designed in order to resist these temperature conditions they are periodically subjected during all service life of electrical oven.
Another solution approach for the above mentioned cleaning drawback has been to coat casing and baffle case surfaces in direct contact with the cooking chamber with an anti-adherent coating, for instance, that made by PEMCO International under the denomination "Nanoclean". This other solution overcomes the deficiencies of the above mentioned pyrolytic cleaning method because it does not require the calcination of residues and food and fat depositions within the cooking chamber by means of substantial rise of electrical oven temperature. However, despite of having excellent mechanical resistance and defining an quite fine invisible protective layer and prevent the adherence of dirty and food residues in the inner surfaces of cooking chamber, this coating "Nanoclean" presents, as main drawback, its limited resistance to temperature. Above 300C, said coating is damaged and surfaces lose the dirty non-adherence feature over them.
It still occurs that in the here considered type electrical ovens, the inner surfaces of cooking chamber, that are closer to the electrical resistance, are the lower, top and side walls of cooking chamber. The electrical resistance heats these surfaces mainly by heat irradiation wherein they generally exceed the temperature threshold supported by coating "Nanoclean", making then said coating application impracticable.
An example of here considered type kitchen electrical oven construction can be seen in patent document EP 0 319 373 A1.
Because of prior art existing limitations to provide an electrical oven of the here considered type and that has self-cleaning features or at least meaningfully facilitates the cleaning operation of cooking chamber inner surfaces, it becomes desirable to provide a kitchen electrical oven that has said self-cleaning or easy cleaning features, without requiring high expenditure of temperature, or exhales undesirable odors to oven operation environment, during cleaning operation.
Summary of the invention
As stated above, it becomes an objective of the present invention to provide a kitchen electrical oven, of forced convection type and that has a simple and robust construction, allowing the inner surfaces, faced to the cooking chamber inside, be coated with an anti-adherent coating that supports only temperatures of about 300C, without lose its anti-adherence features to dirty or food residues thrown against said surfaces during electrical oven operation.
These and other objectives of the present invention are achieved from an electrical oven provision of the type defined in the present specification introduction and that comprises a reflector means of thermal irradiation provided inside baffle case, between electrical resistance and a wall portion of baffle case defined between an electrical resistance and the cooking chamber; and an anti-adherent coating applied to the surfaces of casing and baffle case faced to the inside of cooking chamber.
Brief description of the drawings
The invention will be described in the following, with reference to the attached drawings, given by means of invention configuration example and wherein:
Figure 1 represents a view in front and simplified perspective of an electrical oven casing, without usual front door and bearing a baffle case in its rear wall;
Figure 2 represents a view in central vertical cross section of baffle case mounted inside casing, of figure 1 , partially illustrated;
Figure 3 represents a view in vertical and simplified cross section of casing, said section has been taken as per line Ill-Ill in figure 2; and
Figure 4 represents a view in partially sectioned and external front perspective of baffle case bearing a reflector means of thermal irradiation. Detailed description of the invention
As mentioned above and still illustrated in the attached drawings, the invention concerns to a kitchen electrical oven, of the type that comprises a casing 10, usually parallelepipedic, built from any suitable material, generally in metallic plate suitably treated and internally defining a cooking chamber CC. The casing 10, of generally parallelepipedic shape, has a top wall 11 , a lower wall 12, a pair of side walls 13 and a rear wall 14. The casing front region 10 is usually open to be closed by a door of any suitable construction and that is not illustrated in the attached drawings for not pertaining to the present invention. The concerned electrical oven still comprises a baffle case 20 usually from metallic plate and in the illustrated configuration comprises a tubular side wall 21 , protruding from rear wall 14 of casing 10, to the inside of cooking chamber CC and yet a portion of front wall 22 closing a free end of tubular side wall 21. In the illustrated configuration in the drawings, the tubular side wall portion 21 of baffle case 20 presents a truncated-cone shape with the minor base defined and closed by the front wall portion 22 that in this case takes the circular shape, wherein the tubular side wall 21 yet embodies, in its base end, an external peripherical flange 23 to be seated and attached against the casing 10 rear wall 14.
The tubular side wall 21 has a plurality of air outlet openings 21a, disposed radially and angularly spaced from one another, wherein the front wall portion 22 has an air inlets openings assembly 22a disposed axial and centrally, wherein in the illustrated constructive example, the air openings assembly 22a is defined by a plurality of borings made in the front wall portion 22, defining a kind of screen to the air axial inlet from cooking chamber CC inside to the baffle case 20 inside.
Although it has been illustrated here a baffle case of circular tubular shape attached internally to casing 10 rear wall 14, it should be understood that the baffle case 20 can be defined with its front wall portion 22 coplanar to the rear wall 14 of the casing 10, in which condition tubular side wall portion
21 of baffle case 20 begins to protrude behind the rear wall 14 of the casing
10. In this case, the baffle case 20 front wall portion 22 begins to exhibit not only the air inlet openings assembly 22a but also a plurality of eccentric openings, to define the air outlet openings 21a.
Inside the baffle case 20, an electrical resistance 30 is mounted, of tubular annular shape, disposed slightly away from front wall portion 22, around the air inlet openings assembly 22a.
The baffle case 20 still houses a fan 40 of centrifugal type and coax- ial to the electrical resistance 30 and that is actuated by an electrical motor "M" shown in figure 2, placed rearwardly to the casing 10 rear wall 14, wherein the fan is sized to produce a forced air flow in cooking chamber CC, through air inlet openings 22a, electrical resistance 30 and air outlet openings 21a, back to the cooking chamber CC. The above described construction allows that during electrical oven operation with electrical resistance 30 activation, heat irradiated by this latter heats side 21 and front 22 tubular wall portions, of baffle case 20, which irradiate heat to the interior of the cooking chamber CC. Along with this heat ir-
radiation from baffle case 20 to the cooking chamber CC inside, fan 40 produces a forced air convection, sucking it axially from cooking chamber CC, passing it by the electrical resistance 30 inside the baffle case 20, heating said air flow and giving it back to the cooking chamber CC inside through the air outlet openings 21 a.
According to the invention, a thermal irradiation reflector means 50 is provided inside the baffle case 20, placed between electrical resistance 30 and a wall portion of baffle case 20, defined between the electrical resistance 30 and the cooking chamber CC, wherein in the illustrated configuration, said wall portion is defined by front wall portion 22. The thermal irradiation reflector means 50 is built so as to reflect thermal irradiation produced by electrical resistance 30 back to the baffle case 20 inside, preventing wall portion 22 of baffle case 20 adjoining to the electrical resistance 30, from being heated to temperatures of about 300 0C or higher. With the proposed constructive arrangement, with thermal irradiation reflector means 50 provision, it is possible to provide an anti-adherent coating 60 on the surfaces of the casing 10 and the baffle case 20 faced to cooking chamber CC inside, this anti-adherent coating 60 being able to be defined by known product "Nanoclean", that shows excellent anti-adherent features, but that can not be subjected to temperatures on the order of 300 0C and higher.
In the illustrated construction, irradiation reflector means 50 is placed only between front wall portion 22 and electrical resistance 30, being able to take the shape of a reflector metallic plate, seated and attached against said front wall portion 22 of baffle case 20. It should be understood that thermal irradiation reflector means 50 can be defined in own inner face of front wall portion 22 of baffle case 20 faced to the electrical resistance or be defined by an inner coating of said front wall portion 22 of the baffle case 20, said inner
coating being able to be in the shape of a reflective film applied to said front wall portion 22 of the baffle case 20.
The herein proposed construction allows keeping temperature of wall portions 21 , 22 of baffle case 20 in temperatures below 300° C, even though said wall portions are adjoining to electrical resistance 30, since the irradiated heat from this latter is reflected from baffle case 20 inside, not heating excessively the metallic structure of this latter. So, it is possible to apply to the inner surfaces of cooking chamber CC an anti-adherent coating 60, for instance, that known by trademark "Nanoclean", making the inner surface of the cooking chamber CC self-cleaner or at least of extremely easier cleaning by non-adherent features of said coating 60.
Although just an exemplary embodiment of present invention has been herein illustrated, it should be understood that changes in shape and arrangement of different parts components can be made without departing from exposed concept defined in claims that accompany the present specification.
Claims
1. Kitchen electrical oven, of the type that comprises: a casing (10) defining, internally, a cooking chamber (CC); a baffle case (20) comprising wall portions (21 , 22) mounted to the casing (10) and having air inlet and out- let openings (22a, 21a) in direct communication with cooking chamber (CC); a electrical resistance (30) mounted inside of baffle case (20); and a fan (40) inside the baffle case (20), to produce a forced air flow from cooking chamber (CC), through air inlet openings (22a), electrical resistance (30) and air outlet openings (21a), back to cooking chamber (CC), characterized by the fact that comprises: a thermal irradiation reflector means (50) provided inside baffle case (20) between electrical resistance (30) and a wall portion (22) of baffle case (20), defined, between electrical resistance (30) and cooking chamber (CC); and an anti-adherent coating (60) applied to the surfaces of the casing (10) and baffle case (20) faced to the cooking chamber (CC) inside.
2. Electrical oven, according to claim 1 , characterized by the fact that the thermal irradiation reflector means (50) is shaped as a reflective metallic plate.
3. Electrical oven, according to claim 1 , characterized by the fact that the thermal irradiation reflector means (50) is defined in the inner face of said wall portion (22) of baffle case (20), faced to the electrical resistance.
4. Electrical oven, according to claim 1 , characterized by the fact that the thermal irradiation reflector means (50) defines an inner coating of said wall portion (22) of baffle case (20).
5. Electrical oven, according to claim 4, characterized by the fact that the thermal irradiation reflector means (50) is defined by a reflective film applied to said wall portion (22) of baffle case (20).
6. Electrical oven, according to claim 4, characterized by the fact that the thermal irradiation reflector means (50) is defined by a reflector plate internally covering said wall portions (22) of baffle case (20).
7. Electrical oven, according to any of claims 1 , 2, 3, 4, 5 or 6, char- acterized by the fact that the baffle case (20) comprises: a tubular side wall portion (21 ), protruding from the rear wall (14) of the casing (10) to the inside of cooking chamber (CC) and provided with a plurality of air outlet openings (21a) disposed radially; and a front wall portion (22), closing a free end of the tubular side wall (21 ) and provided with an air inlet openings assembly (22a) disposed axially and centrally, said electrical resistance (30) having an annular shape and being disposed slightly away from the front wall portion (22), around the air inlet openings assembly (22a).
8. Electrical oven, according to claim 7, characterized by the fact that the fan (40) is centrifugal and coaxial to the electrical resistance (30).
9. Electrical oven, according to claim 7, characterized by the fact that the tubular side wall portion (21 ) has a truncated-cone shape, with the minor base defined and closed by the front wall portion (22).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| BRPI0705623-0 | 2007-12-21 | ||
| BRPI0705623 BRPI0705623A2 (en) | 2007-12-21 | 2007-12-21 | kitchen electric oven |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| WO2009079728A2 true WO2009079728A2 (en) | 2009-07-02 |
| WO2009079728A3 WO2009079728A3 (en) | 2010-01-28 |
Family
ID=40801589
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/BR2008/000371 WO2009079728A2 (en) | 2007-12-21 | 2008-12-05 | Kitchen electrical oven |
Country Status (2)
| Country | Link |
|---|---|
| BR (1) | BRPI0705623A2 (en) |
| WO (1) | WO2009079728A2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ITMI20121879A1 (en) * | 2012-11-05 | 2014-05-06 | Ma Ti Ka S R L | PANEL FOR OVEN |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1778009A1 (en) * | 1968-03-20 | 1972-03-16 | Licentia Gmbh | Roasting oven |
| EP1109425A2 (en) * | 1999-12-17 | 2001-06-20 | Lg Electronics Inc. | Efficient supplying of heat generated from a heater installed in the electronic range |
| US6730881B1 (en) * | 2002-12-13 | 2004-05-04 | Maytag Corporation | Cooking appliance having accelerated cooking system |
| US6872926B1 (en) * | 2004-02-25 | 2005-03-29 | Maytag Corporation | Rapid cook oven with dual flow fan assembly |
-
2007
- 2007-12-21 BR BRPI0705623 patent/BRPI0705623A2/en not_active IP Right Cessation
-
2008
- 2008-12-05 WO PCT/BR2008/000371 patent/WO2009079728A2/en active Application Filing
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1778009A1 (en) * | 1968-03-20 | 1972-03-16 | Licentia Gmbh | Roasting oven |
| EP1109425A2 (en) * | 1999-12-17 | 2001-06-20 | Lg Electronics Inc. | Efficient supplying of heat generated from a heater installed in the electronic range |
| US6730881B1 (en) * | 2002-12-13 | 2004-05-04 | Maytag Corporation | Cooking appliance having accelerated cooking system |
| US6872926B1 (en) * | 2004-02-25 | 2005-03-29 | Maytag Corporation | Rapid cook oven with dual flow fan assembly |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ITMI20121879A1 (en) * | 2012-11-05 | 2014-05-06 | Ma Ti Ka S R L | PANEL FOR OVEN |
| WO2014068533A1 (en) * | 2012-11-05 | 2014-05-08 | Ma.Ti.Ka. S.R.L. | Oven panel |
| US9791157B2 (en) | 2012-11-05 | 2017-10-17 | Ma.Ti.Ka. S.R.L. | Oven panel |
Also Published As
| Publication number | Publication date |
|---|---|
| BRPI0705623A2 (en) | 2009-08-18 |
| WO2009079728A3 (en) | 2010-01-28 |
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