GB2179529A - Cooking ovens - Google Patents

Cooking ovens Download PDF

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Publication number
GB2179529A
GB2179529A GB08618661A GB8618661A GB2179529A GB 2179529 A GB2179529 A GB 2179529A GB 08618661 A GB08618661 A GB 08618661A GB 8618661 A GB8618661 A GB 8618661A GB 2179529 A GB2179529 A GB 2179529A
Authority
GB
United Kingdom
Prior art keywords
cooking
cooking chamber
microwave
oven
ofthe
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.)
Granted
Application number
GB08618661A
Other versions
GB2179529B (en
GB8618661D0 (en
Inventor
Peter John Churm
John Peter Richards
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.)
Cannon Industries Ltd
Original Assignee
Cannon Industries Ltd
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
Priority claimed from GB858519549A external-priority patent/GB8519549D0/en
Application filed by Cannon Industries Ltd filed Critical Cannon Industries Ltd
Priority to GB08618661A priority Critical patent/GB2179529B/en
Publication of GB8618661D0 publication Critical patent/GB8618661D0/en
Publication of GB2179529A publication Critical patent/GB2179529A/en
Application granted granted Critical
Publication of GB2179529B publication Critical patent/GB2179529B/en
Expired legal-status Critical Current

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Classifications

    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05BELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00Heating by electric, magnetic or electromagnetic fields
    • H05B6/64Heating using microwaves
    • H05B6/74Mode transformers or mode stirrers
    • H05B6/745Rotatable stirrers
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24CDOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
    • F24C3/00Stoves or ranges for gaseous fuels
    • F24C3/008Ranges
    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05BELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00Heating by electric, magnetic or electromagnetic fields
    • H05B6/64Heating using microwaves
    • H05B6/647Aspects related to microwave heating combined with other heating techniques
    • H05B6/6482Aspects related to microwave heating combined with other heating techniques combined with radiant heating, e.g. infrared heating
    • H05B6/6485Aspects related to microwave heating combined with other heating techniques combined with radiant heating, e.g. infrared heating further combined with convection heating
    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05BELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00Heating by electric, magnetic or electromagnetic fields
    • H05B6/64Heating using microwaves
    • H05B6/76Prevention of microwave leakage, e.g. door sealings
    • H05B6/766Microwave radiation screens for windows

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Constitution Of High-Frequency Heating (AREA)
  • Baking, Grill, Roasting (AREA)

Abstract

A combined gas and microwave cooking oven has its gas burner 13 located outside the cooking chamber, the heated air being admitted with and discharged from the cooking chamber through openings 14, 16 of dimensions which restrict the passage of microwave energy. The burner is thereby protected against food spillage. A radiant electric heater 20 may be disposed in the oven behind a removable panel 15. Magnetron 6 and mode stirrer 7 may be disposed in a well 4 underneath the cooking chamber. <IMAGE>

Description

SPECIFICATION Cooking ovens This invention relates to combined gas and microwave cooking ovens which can use each cooking medium sepa rately or simultaneously.
According tothe invention a combined gas and microwave cooking oven comprises a cooking cham berlhasing an access opening closeable bya door and forming a microwave cavity, means for supplying microwave energyto the cooking chamber, a gas burner located externally of said cooking chamber, a plurality of inlet perforations in a wall ofthe cooking chamberforthepassage of hot products of combustion from the burner into the cooking chamberand a plurality of discharge openings to pass from the cookingchamberinto a flue, the openings being of such dimensions asto restrictthe passage of said microwave energy thereth rough.
The location ofthe burner externally of the cooking chamber ensures that it is protected from food spillage.
The inlet and discharge openings are preferably disposed so thatthe hot combustion products circulate through the cooking chamber by convection only.
Preferably an inner panel extendsacrossthe cooking chamber adjacentthe roofthereof, and the inlet openings are disposed in the upper part ofthe rear wall so as to admit combustion products into the space between the panel and the roof, to be fed into the cooking chamber adjacent the front thereof, the discharge openings being disposed at the lower part ofthe rear of thecooking chamber, for example adjacentthe bottom oftherearwall The inner panel is preferably of microwave-transpa- rent material and is removable from the cooking chamber. A sheathed wire electric heater is conveniently positioned adjacent the roof of the cooking chamber so that it can be used as a grill when the panel is removed.
One combined gas and microwave oven in accord a nice with the invention will now be described by way of example with referenceto Figures 1 and 2 of the accompanying schematic drawing, in which Figure 1 reprewents a sectional side view ofthe oven in diagrammatic form, and Figure 2 illustrates, also diagrammatically, a pers pectiveviewofpartofthe oven.
The oven comprises a sheet metal casing 1 having top, bottom, side and backwalls and an open front closeable by a door 2to provide a microwave oven cavity which constitutes the cooking chamber.
The bottom wall 3 of the casing is formed with a central well 4, thetop of which is closed by a panel 5 of microwave-transparent material and accommodates a microwave energy generator, such as a magnetron, shown diagrammatically at 6. A mode stirrer7 is also located within the well 4, being fixed to the top of a shaft 8, driven in use ofthe oven by an electric motor (notshown) mounted beneath the oven within a sheet metal support structure shown in part at S.
The back wall 1 Q ofthe casing 1 has fitted to it externally a flanged panel 11, constituting a burner enclosure 12, in which is disposed, centrally at the bottom, a gas burner 13.
The top of the back wall loins formed with a series of perforations 14 which are of a size which limits the passage of the microwave energy, but allow hot air, incorporating products ofcombustion, in use ofthe burner, to pass from the burner enclosure into aspace formed between an inner removable roof panel 15 and heat shield 1-5A andthe roof 21 of the cooking chamber, the hot air being conveyed through said space towards the upperfront part of the cooking chamber as indicated by the full-line arrows.
Further perforations 16, also of a size which limits the passage of the microwave energy, areformed in the lower part of the back wall 1-o ofthe casing 7 to allow the heated air, after circulating downwards and rearwards through the cooking chamber, as indicated by the broken-line arrows, to be discharged firstly into short lengths of ducts 23 located within the space enclosed bytheflanged panel lion each side of the burner 13. and then, through further openings 18in therearwallofthepanel 11 into a flue 19.
It will be observed that the mounting of the gas burner 13 3 outside the cooking chamber ensures that it is protectedfromfood spillage.
The removable roof panel 15 is of microwavetransparent material, and its removal reveals a metal sheathed wire electric heating element 20 supported bythe roof 21, and which can be usedfor grilling or toasting with the roof panel 15 removed.
Although, in the example described, the microwave generator is located beneath the bottom ofthe oven this need not necessarily be the case and the microwave energy can be arranged to be introduced into the oven at any other suitable location.
ClAIMS
2. A combined gas and microwave cooking oven comprising a cooking chamber having an access opening closeable by a door andforming a microwave cavity, means four supplying microwave energy to the cooking chamber, a gas burner located externally of said cooking chamber, a plurality of inlet perforations in a wall of the cooking chamberforthe passage of hot products of combustion fromthe burner into the cooking chamber and a plurality of discharge openings to passfrom the cooking chamber into a flue, the openings being of such dimensions as to restnctthe passage of said microwave energy therethrough.
2. A cooking oven according to Claim t wherein the inlet and discharge openings are disposed so that the hot combustion products circulate through the cooking chamber by convection only.
3. A cooking oven according to Claim 2 wherein an inner panel extends across the cooking chamber adjacent the roofthereof, and the inlet openings are disposed in the upper part of the rear wall so as to admit combustion products into the space between the panel and the roof, to be fed into the cooking chamberadjacentthefrontthereof,thedischarge openings being disposed atthe lowerpartofthe rear ofthe cooking chamber.
4. Acooking oven according to Claim 3 wherein the discharge openings are in the lower part ofthe rear wall.
5. A cooking oven according to Claim2, 3 or4 wherein the inner panel is of microwave-transparent
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (10)

  1. **WARNING** start of CLMS field may overlap end of DESC **.
    SPECIFICATION Cooking ovens This invention relates to combined gas and microwave cooking ovens which can use each cooking medium sepa rately or simultaneously.
    According tothe invention a combined gas and microwave cooking oven comprises a cooking cham berlhasing an access opening closeable bya door and forming a microwave cavity, means for supplying microwave energyto the cooking chamber, a gas burner located externally of said cooking chamber, a plurality of inlet perforations in a wall ofthe cooking chamberforthepassage of hot products of combustion from the burner into the cooking chamberand a plurality of discharge openings to pass from the cookingchamberinto a flue, the openings being of such dimensions asto restrictthe passage of said microwave energy thereth rough.
    The location ofthe burner externally of the cooking chamber ensures that it is protected from food spillage.
    The inlet and discharge openings are preferably disposed so thatthe hot combustion products circulate through the cooking chamber by convection only.
    Preferably an inner panel extendsacrossthe cooking chamber adjacentthe roofthereof, and the inlet openings are disposed in the upper part ofthe rear wall so as to admit combustion products into the space between the panel and the roof, to be fed into the cooking chamber adjacent the front thereof, the discharge openings being disposed at the lower part ofthe rear of thecooking chamber, for example adjacentthe bottom oftherearwall The inner panel is preferably of microwave-transpa- rent material and is removable from the cooking chamber. A sheathed wire electric heater is conveniently positioned adjacent the roof of the cooking chamber so that it can be used as a grill when the panel is removed.
    One combined gas and microwave oven in accord a nice with the invention will now be described by way of example with referenceto Figures 1 and 2 of the accompanying schematic drawing, in which Figure 1 reprewents a sectional side view ofthe oven in diagrammatic form, and Figure 2 illustrates, also diagrammatically, a pers pectiveviewofpartofthe oven.
    The oven comprises a sheet metal casing 1 having top, bottom, side and backwalls and an open front closeable by a door 2to provide a microwave oven cavity which constitutes the cooking chamber.
    The bottom wall 3 of the casing is formed with a central well 4, thetop of which is closed by a panel 5 of microwave-transparent material and accommodates a microwave energy generator, such as a magnetron, shown diagrammatically at 6. A mode stirrer7 is also located within the well 4, being fixed to the top of a shaft 8, driven in use ofthe oven by an electric motor (notshown) mounted beneath the oven within a sheet metal support structure shown in part at S.
    The back wall 1 Q ofthe casing 1 has fitted to it externally a flanged panel 11, constituting a burner enclosure 12, in which is disposed, centrally at the bottom, a gas burner 13.
    The top of the back wall loins formed with a series of perforations 14 which are of a size which limits the passage of the microwave energy, but allow hot air, incorporating products ofcombustion, in use ofthe burner, to pass from the burner enclosure into aspace formed between an inner removable roof panel 15 and heat shield 1-5A andthe roof 21 of the cooking chamber, the hot air being conveyed through said space towards the upperfront part of the cooking chamber as indicated by the full-line arrows.
    Further perforations 16, also of a size which limits the passage of the microwave energy, areformed in the lower part of the back wall 1-o ofthe casing 7 to allow the heated air, after circulating downwards and rearwards through the cooking chamber, as indicated by the broken-line arrows, to be discharged firstly into short lengths of ducts 23 located within the space enclosed bytheflanged panel lion each side of the burner 13. and then, through further openings 18in therearwallofthepanel 11 into a flue 19.
    It will be observed that the mounting of the gas burner 13 3 outside the cooking chamber ensures that it is protectedfromfood spillage.
    The removable roof panel 15 is of microwavetransparent material, and its removal reveals a metal sheathed wire electric heating element 20 supported bythe roof 21, and which can be usedfor grilling or toasting with the roof panel 15 removed.
    Although, in the example described, the microwave generator is located beneath the bottom ofthe oven this need not necessarily be the case and the microwave energy can be arranged to be introduced into the oven at any other suitable location.
    ClAIMS
    2. A combined gas and microwave cooking oven comprising a cooking chamber having an access opening closeable by a door andforming a microwave cavity, means four supplying microwave energy to the cooking chamber, a gas burner located externally of said cooking chamber, a plurality of inlet perforations in a wall of the cooking chamberforthe passage of hot products of combustion fromthe burner into the cooking chamber and a plurality of discharge openings to passfrom the cooking chamber into a flue, the openings being of such dimensions as to restnctthe passage of said microwave energy therethrough.
  2. 2. A cooking oven according to Claim t wherein the inlet and discharge openings are disposed so that the hot combustion products circulate through the cooking chamber by convection only.
  3. 3. A cooking oven according to Claim 2 wherein an inner panel extends across the cooking chamber adjacent the roofthereof, and the inlet openings are disposed in the upper part of the rear wall so as to admit combustion products into the space between the panel and the roof, to be fed into the cooking chamberadjacentthefrontthereof,thedischarge openings being disposed atthe lowerpartofthe rear ofthe cooking chamber.
  4. 4. Acooking oven according to Claim 3 wherein the discharge openings are in the lower part ofthe rear wall.
  5. 5. A cooking oven according to Claim2, 3 or4 wherein the inner panel is of microwave-transparent materiatand is removable from the cooking chamber.
  6. 6. A cooking oven according to Claim 5 wherein a sheathed wire electric heating element its positioned adjacent the roof of the cooking chamber so that it can be used for grillingpurposes when the inner panel is removed.
  7. 7. A cooking oven according to any preceding Claim wherein the gas burner is located behind the rear wall ofthe cooking chamber.
  8. 8. Acookingoven according to any preceding Claim wherein the bottom wall ofthe cooking chamberisformed with awell closed atthetop by a panel of microwave-transparent material and accommodates a microwave energy generatorfor supplying said microwave energy to the cooking chamber.
  9. 9. Acookingoven accordingto Claim 7whereina rotatable mode stirrer is also locatedwithin said well.
  10. 10. A combined gas and microwave cooking oven substantially as shown in andashereinbeforede- scribed with referenceto Figures 1 and 2 ofthe accompanying drawing.
GB08618661A 1985-08-02 1986-07-31 Cooking ovens Expired GB2179529B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB08618661A GB2179529B (en) 1985-08-02 1986-07-31 Cooking ovens

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB858519549A GB8519549D0 (en) 1985-08-02 1985-08-02 Cooking ovens
GB08618661A GB2179529B (en) 1985-08-02 1986-07-31 Cooking ovens

Publications (3)

Publication Number Publication Date
GB8618661D0 GB8618661D0 (en) 1986-09-10
GB2179529A true GB2179529A (en) 1987-03-04
GB2179529B GB2179529B (en) 1988-06-15

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ID=26289604

Family Applications (1)

Application Number Title Priority Date Filing Date
GB08618661A Expired GB2179529B (en) 1985-08-02 1986-07-31 Cooking ovens

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2179139B (en) * 1985-08-02 1989-07-26 Cannon Ind Ltd Gas ovens
EP0698768A1 (en) 1994-06-22 1996-02-28 ZANUSSI GRANDI IMPIANTI S.p.A. Combined gas-microwave cooking oven with steam cooking facility

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1538851A (en) * 1976-04-14 1979-01-24 Boc International Ltd Microwave heating
GB2028069A (en) * 1978-08-03 1980-02-27 Tokyo Sanyo Electric Co Combined microwave and gas heated oven
GB2035767A (en) * 1978-11-20 1980-06-18 Raytheon Co Microwave oven
GB2035768A (en) * 1978-11-20 1980-06-18 Raytheon Co Combination microwave and convection oven
GB2042310A (en) * 1979-01-16 1980-09-17 Raytheon Co A combination microwave and convection oven

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1538851A (en) * 1976-04-14 1979-01-24 Boc International Ltd Microwave heating
GB2028069A (en) * 1978-08-03 1980-02-27 Tokyo Sanyo Electric Co Combined microwave and gas heated oven
GB2035767A (en) * 1978-11-20 1980-06-18 Raytheon Co Microwave oven
GB2035768A (en) * 1978-11-20 1980-06-18 Raytheon Co Combination microwave and convection oven
GB2042310A (en) * 1979-01-16 1980-09-17 Raytheon Co A combination microwave and convection oven

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2179139B (en) * 1985-08-02 1989-07-26 Cannon Ind Ltd Gas ovens
EP0698768A1 (en) 1994-06-22 1996-02-28 ZANUSSI GRANDI IMPIANTI S.p.A. Combined gas-microwave cooking oven with steam cooking facility
US5556566A (en) * 1994-06-22 1996-09-17 Zanussi Grandi Impianti S.P.A. Combined gas-microwave cooking oven with steam operation

Also Published As

Publication number Publication date
GB2179529B (en) 1988-06-15
GB8618661D0 (en) 1986-09-10

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Legal Events

Date Code Title Description
732E Amendments to the register in respect of changes of name or changes affecting rights (sect. 32/1977)
PCNP Patent ceased through non-payment of renewal fee

Effective date: 19930731