EP0224775A1 - Microwave oven of the installation type - Google Patents
Microwave oven of the installation type Download PDFInfo
- Publication number
- EP0224775A1 EP0224775A1 EP86115825A EP86115825A EP0224775A1 EP 0224775 A1 EP0224775 A1 EP 0224775A1 EP 86115825 A EP86115825 A EP 86115825A EP 86115825 A EP86115825 A EP 86115825A EP 0224775 A1 EP0224775 A1 EP 0224775A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- cavity
- air
- microwave
- door
- microwave oven
- 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.)
- Withdrawn
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Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B6/00—Heating by electric, magnetic or electromagnetic fields
- H05B6/64—Heating using microwaves
- H05B6/66—Circuits
- H05B6/666—Safety circuits
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B6/00—Heating by electric, magnetic or electromagnetic fields
- H05B6/64—Heating using microwaves
- H05B6/6402—Aspects relating to the microwave cavity
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B6/00—Heating by electric, magnetic or electromagnetic fields
- H05B6/64—Heating using microwaves
- H05B6/642—Cooling of the microwave components and related air circulation systems
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B6/00—Heating by electric, magnetic or electromagnetic fields
- H05B6/64—Heating using microwaves
- H05B6/76—Prevention of microwave leakage, e.g. door sealings
- H05B6/766—Microwave radiation screens for windows
Definitions
- the invention relates to a microwave cooking oven of the installation module type for domestic use adapted to be included in composable kitchen furniture.
- Microwave cooking ovens generally present various functional problems requiring specific solutions.
- the main problems derive from the necessity of cooling the microwave generator components, of preventing the escape of microwaves to the environment of the oven, and of eliminating condensates developing in the oven chamber during the cooking of certain types of foods.
- the air used for cooling the microwave generator and associated control components is usually directed into the oven chamber through suitable conduits, part of this air being in some cases deflected towards a rotatable reflector or agitator for causing it to rotate.
- This air is aspirated from the environment and put into circulation by means of a power-driven fan, and subsequently leaves the oven chamber, together with entrained condensates, through discharge conduits located at the rear of the oven and provided with sealing means preventing the escape of microwaves.
- Known microwave ovens of the installation type are therefore provided with suitable conduits leading from an opening in the rear wall of the oven chamber to louvres formed at the front above the oven.
- These conduits extend exteriorly of and above the oven chamber, resulting in a more complicated construction and certain functional disadvantages.
- These conduits in fact represent an indispensable accessory to be separately mounted as the oven is being installed, and cause a noticable pressure drop in the air flow towards the outlet; in addition, the air outlet louvres impose a considerable limitation on the height of the door and thus also of the oven chamber.
- the main object of the invention is thus the provision of a microwave oven of the installation type which is of simplified construction and simple and reliable performance.
- the invention is thus intended to provide an oven designed to be readily installed in a composable assembly without requiring particular accessories for the circulation of the air entraining cooking vapours and for camouflaging the air outlet, in place of which the respective components are to be incorporated in the oven itself, so that the appearance of the complete oven structure is in harmony with that of the surrounding furniture.
- a microwave oven of the installation type for domestic use comprising a cavity for containing foods to be cooked, a door provided with a handle for closing the cavity, a microwave generator and associated agitator connected to the cooking cavity, and means including a fan and associated air conduit for cooling the microwave generator, the oven being characterized in that the cooking cavity is directly connected to the cooling air intake conduit and that the discharge of the air from the cavity takes place through front openings associated to the handle and provided with sealing means preventing escape of microwaves disposed in a corresponding part of the door.
- the microwave oven shown in the drawings generally comprises a cooking cavity or chamber 10 having a front wall 9 closed by a door 11.
- a microwave generator magnet
- an associated power-driven fan 13 for aspirating ambient air and directing it through a conduit 14 for cooling magnetron 12.
- the latter is connected, by way of a waveguide 15, to a chamber 16 housing a rotatable microwave reflector or agitator 17.
- Waveguide 15 and agitator chamber 16 are disposed above cooking cavity 10, chamber 16 communicating with cavity 10 through connecting passages (not shown).
- cooling air conduit 14 is extended beyond magnetron 12 and branches into a first branch 18 opening tangentially into chamber 16 of agitator 17, and a second branch 19 opening directly into cooking cavity 10.
- Cavity 10 communicates through passages 30 (fig. 2) with a discharge conduit 20 disposed thereabove at a suitable position and formed with outlet openings 21 in front face 9 of the oven.
- Discharge conduit 20 is preferably mounted at a lateral position with respect to cooking cavity 10 (fig.1) at a location diametrally opposite the opening of conduit branch 19.
- This arrangement is not, however, strictly unalterable, as it depends on the geometry of cavity 10 and on the relative positions of the functional components of the oven, that is to say, it is to be defined in manner to ensure the most efficient circulation of the air within cavity 10 as indicated by arrows in the drawings so as to evacuate therefrom the vapours formed during the cooking of foods.
- the direct discharge of the air at the front face of the oven should be suitably controlled so as to prevent the simultaneous escape of microwaves.
- door 11 to be suitably modified.
- door 11 is usually composed of a metal frame 22 having a suitable shaped boundary for forming a microwave trap 23, a perforate panel permitting inspection of the interior of the oven, and inner and outer window panes 24 and 25 secured to the frame.
- Door 11 is additionally provided with a handle 27.
- the modification of door 11 with respect to the described conventional construction comprises an upwards directed extension 28 of frame 22.
- Extension 28 extends in front of outlet 21 of discharge conduit 20 and is provided with openings dimensioned and positioned so as to prevent microwaves from passing therethrough.
- the dimensions of the openings have to be smaller than one-fourth of the wavelength of the microwave radiation.
- This solution permits the provision also in the upper part of the oven of a microwave trap for a suitable wavelength for preventing any microwaves from escaping through the food charging opening of cavity 10.
- This problem is solved in the traditional manner along the lateral and lower boundaries of the oven, where there are no openings for the discharge of air, so that the required microwave trap may be formed by the door frame and the borders of the door opening of the cooking cavity.
- the oven according to the invention thus attains the stated objects. Above all it constitutes a complete and compact unit capable of being pre-assembled and subsequently in stalled in a piece of kitchen furniture without requiring the addition of accessory elements such as conduits for the circulation and discharge of air.
- the removal of vapours from the cooking cavity is ensured in a particularly efficient manner, because the major part of the air is directly directed into the cavity at an elevated pressure thanks to the reduction of the length of the connecting conduits and the corresponding pressure losses.
- the air is finally discharged at the front, thus eliminating the excessive space requirements in a piece of furniture in the case of a rear-mounted exhaust stack.
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Electric Ovens (AREA)
Abstract
Description
- The invention relates to a microwave cooking oven of the installation module type for domestic use adapted to be included in composable kitchen furniture.
- Microwave cooking ovens generally present various functional problems requiring specific solutions. The main problems derive from the necessity of cooling the microwave generator components, of preventing the escape of microwaves to the environment of the oven, and of eliminating condensates developing in the oven chamber during the cooking of certain types of foods.
- The air used for cooling the microwave generator and associated control components is usually directed into the oven chamber through suitable conduits, part of this air being in some cases deflected towards a rotatable reflector or agitator for causing it to rotate. This air is aspirated from the environment and put into circulation by means of a power-driven fan, and subsequently leaves the oven chamber, together with entrained condensates, through discharge conduits located at the rear of the oven and provided with sealing means preventing the escape of microwaves.
- A solution of this kind cannot be applied to microwave ovens of the installation type, because the composable kitchen furniture pieces have a closed continuous rear wall. The employ, however, of a rear-mounted exhaust stack for directing air and cooking vapours upwards would inevitably imply technical difficulties and higher cost and obviously result in a reduction of the available depth in furniture pieces mounted above the oven due to the space requirements of the stack.
- Known microwave ovens of the installation type are therefore provided with suitable conduits leading from an opening in the rear wall of the oven chamber to louvres formed at the front above the oven. These conduits extend exteriorly of and above the oven chamber, resulting in a more complicated construction and certain functional disadvantages. These conduits in fact represent an indispensable accessory to be separately mounted as the oven is being installed, and cause a noticable pressure drop in the air flow towards the outlet; in addition, the air outlet louvres impose a considerable limitation on the height of the door and thus also of the oven chamber.
- The main object of the invention is thus the provision of a microwave oven of the installation type which is of simplified construction and simple and reliable performance. The invention is thus intended to provide an oven designed to be readily installed in a composable assembly without requiring particular accessories for the circulation of the air entraining cooking vapours and for camouflaging the air outlet, in place of which the respective components are to be incorporated in the oven itself, so that the appearance of the complete oven structure is in harmony with that of the surrounding furniture.
- It is further intended to ensure an efficient elimination of condensates from the cooking chamber by the immission of air at an elevated pressure by way of a circuit causing minimum pressure drop and by the employ of a controlled discharge at a suitable location.
- These objects of the invention are attained in a microwave oven of the installation type for domestic use, comprising a cavity for containing foods to be cooked, a door provided with a handle for closing the cavity, a microwave generator and associated agitator connected to the cooking cavity, and means including a fan and associated air conduit for cooling the microwave generator, the oven being characterized in that the cooking cavity is directly connected to the cooling air intake conduit and that the discharge of the air from the cavity takes place through front openings associated to the handle and provided with sealing means preventing escape of microwaves disposed in a corresponding part of the door.
- The characteristics of the invention will become more clearly evident from the following description, given by way of example with reference to the accompanying drawings, wherein:
- fig. 1 shows a diagrammatic rear perspective view of an oven according to the invention, and
- fig. 2 shows a diagrammatic perspective front view of a detail of the oven of fig. 1.
- The microwave oven shown in the drawings generally comprises a cooking cavity or
chamber 10 having afront wall 9 closed by adoor 11. - Mounted at the exterior of a rear wall of
cavity 10 is a microwave generator (magnetron) 12 (fig. 1) and an associated power-drivenfan 13 for aspirating ambient air and directing it through aconduit 14 forcooling magnetron 12. The latter is connected, by way of awaveguide 15, to achamber 16 housing a rotatable microwave reflector oragitator 17.Waveguide 15 andagitator chamber 16 are disposed abovecooking cavity 10,chamber 16 communicating withcavity 10 through connecting passages (not shown). According to the invention,cooling air conduit 14 is extended beyondmagnetron 12 and branches into a first branch 18 opening tangentially intochamber 16 ofagitator 17, and asecond branch 19 opening directly intocooking cavity 10. -
Cavity 10 communicates through passages 30 (fig. 2) with adischarge conduit 20 disposed thereabove at a suitable position and formed withoutlet openings 21 infront face 9 of the oven. -
Discharge conduit 20 is preferably mounted at a lateral position with respect to cooking cavity 10 (fig.1) at a location diametrally opposite the opening ofconduit branch 19. - This arrangement is not, however, strictly unalterable, as it depends on the geometry of
cavity 10 and on the relative positions of the functional components of the oven, that is to say, it is to be defined in manner to ensure the most efficient circulation of the air withincavity 10 as indicated by arrows in the drawings so as to evacuate therefrom the vapours formed during the cooking of foods. - The direct discharge of the air at the front face of the oven should be suitably controlled so as to prevent the simultaneous escape of microwaves.
- To this purpose the invention provides for
door 11 to be suitably modified. As shown in fig. 2,door 11 is usually composed of ametal frame 22 having a suitable shaped boundary for forming amicrowave trap 23, a perforate panel permitting inspection of the interior of the oven, and inner andouter window panes Door 11 is additionally provided with ahandle 27. - The modification of
door 11 with respect to the described conventional construction comprises an upwards directedextension 28 offrame 22.Extension 28 extends in front ofoutlet 21 ofdischarge conduit 20 and is provided with openings dimensioned and positioned so as to prevent microwaves from passing therethrough. In particular, the dimensions of the openings have to be smaller than one-fourth of the wavelength of the microwave radiation. - This solution permits the provision also in the upper part of the oven of a microwave trap for a suitable wavelength for preventing any microwaves from escaping through the food charging opening of
cavity 10. This problem is solved in the traditional manner along the lateral and lower boundaries of the oven, where there are no openings for the discharge of air, so that the required microwave trap may be formed by the door frame and the borders of the door opening of the cooking cavity. - The oven according to the invention thus attains the stated objects. Above all it constitutes a complete and compact unit capable of being pre-assembled and subsequently in stalled in a piece of kitchen furniture without requiring the addition of accessory elements such as conduits for the circulation and discharge of air.
- On the other hand, the removal of vapours from the cooking cavity is ensured in a particularly efficient manner, because the major part of the air is directly directed into the cavity at an elevated pressure thanks to the reduction of the length of the connecting conduits and the corresponding pressure losses. The air is finally discharged at the front, thus eliminating the excessive space requirements in a piece of furniture in the case of a rear-mounted exhaust stack.
- Also eliminated is any possibility of an escape of microwaves, thanks to the particular construction of the door and associated sealing means, and that without any reduction of the usable volume of the cooking cavity.
- There is finally attained the technical and economical advantage of employing only a single motor in association with the fan, thereby reducing the number of electric connections and the possibility of malfunctions.
Claims (4)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT3410485U | 1985-11-28 | ||
IT3410485U IT209172Z2 (en) | 1985-11-28 | 1985-11-28 | BUILT-IN MICROWAVE OVEN. |
Publications (1)
Publication Number | Publication Date |
---|---|
EP0224775A1 true EP0224775A1 (en) | 1987-06-10 |
Family
ID=11239253
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP86115825A Withdrawn EP0224775A1 (en) | 1985-11-28 | 1986-11-14 | Microwave oven of the installation type |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP0224775A1 (en) |
IT (1) | IT209172Z2 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2001049078A1 (en) * | 1999-12-27 | 2001-07-05 | Lg Electronics Inc. | Built-in microwave oven |
EP1220575A2 (en) * | 2000-12-30 | 2002-07-03 | Lg Electronics Inc. | Ventilation structure of microwave oven and lamp fitting structure therefor |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1160884A (en) * | 1965-11-04 | 1969-08-06 | Microtherm Ltd | Improvements in and relating to Heating Apparatus |
US3679855A (en) * | 1971-06-11 | 1972-07-25 | Gen Electric | Protective barriers for window of microwave oven door |
US3681557A (en) * | 1969-10-23 | 1972-08-01 | Mitsubishi Electric Corp | Electronic cooking apparatus |
US3783219A (en) * | 1970-11-11 | 1974-01-01 | Sharp Kk | Air cooled microwave cooking oven and door |
EP0003764A1 (en) * | 1978-02-14 | 1979-09-05 | Bosch-Siemens HausgerÀ¤te GmbH | Double baking oven, particularly built-in baking oven |
US4184945A (en) * | 1978-06-12 | 1980-01-22 | Litton Systems, Inc. | Microwave wall oven air flow system |
US4369347A (en) * | 1980-04-09 | 1983-01-18 | Sharp Kabushiki Kaisha | Damper activation in a combined microwave and electric heating oven |
-
1985
- 1985-11-28 IT IT3410485U patent/IT209172Z2/en active
-
1986
- 1986-11-14 EP EP86115825A patent/EP0224775A1/en not_active Withdrawn
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1160884A (en) * | 1965-11-04 | 1969-08-06 | Microtherm Ltd | Improvements in and relating to Heating Apparatus |
US3681557A (en) * | 1969-10-23 | 1972-08-01 | Mitsubishi Electric Corp | Electronic cooking apparatus |
US3783219A (en) * | 1970-11-11 | 1974-01-01 | Sharp Kk | Air cooled microwave cooking oven and door |
US3679855A (en) * | 1971-06-11 | 1972-07-25 | Gen Electric | Protective barriers for window of microwave oven door |
EP0003764A1 (en) * | 1978-02-14 | 1979-09-05 | Bosch-Siemens HausgerÀ¤te GmbH | Double baking oven, particularly built-in baking oven |
US4184945A (en) * | 1978-06-12 | 1980-01-22 | Litton Systems, Inc. | Microwave wall oven air flow system |
US4369347A (en) * | 1980-04-09 | 1983-01-18 | Sharp Kabushiki Kaisha | Damper activation in a combined microwave and electric heating oven |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2001049078A1 (en) * | 1999-12-27 | 2001-07-05 | Lg Electronics Inc. | Built-in microwave oven |
US6528774B2 (en) | 1999-12-27 | 2003-03-04 | Lg Electronics Inc. | Built-in microwave oven |
EP1220575A2 (en) * | 2000-12-30 | 2002-07-03 | Lg Electronics Inc. | Ventilation structure of microwave oven and lamp fitting structure therefor |
EP1220575A3 (en) * | 2000-12-30 | 2004-03-03 | Lg Electronics Inc. | Ventilation structure of microwave oven and lamp fitting structure therefor |
Also Published As
Publication number | Publication date |
---|---|
IT8534104V0 (en) | 1985-11-28 |
IT209172Z2 (en) | 1988-09-16 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AT BE CH DE FR GB IT LI LU NL SE |
|
RAP1 | Party data changed (applicant data changed or rights of an application transferred) |
Owner name: INDUSTRIE ZANUSSI S.P.A. |
|
17P | Request for examination filed |
Effective date: 19871113 |
|
17Q | First examination report despatched |
Effective date: 19891004 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
|
18D | Application deemed to be withdrawn |
Effective date: 19900215 |
|
RIN1 | Information on inventor provided before grant (corrected) |
Inventor name: ROCCARI, RUGGERO Inventor name: ZANZANI, WALTER |