CA1138534A - Twin baking oven with microwave energy source - Google Patents

Twin baking oven with microwave energy source

Info

Publication number
CA1138534A
CA1138534A CA000328770A CA328770A CA1138534A CA 1138534 A CA1138534 A CA 1138534A CA 000328770 A CA000328770 A CA 000328770A CA 328770 A CA328770 A CA 328770A CA 1138534 A CA1138534 A CA 1138534A
Authority
CA
Canada
Prior art keywords
blower
baking oven
housing
cooling air
twin
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.)
Expired
Application number
CA000328770A
Other languages
French (fr)
Inventor
Julius Husslein
Johann Klement
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.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial Co 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
Application filed by Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Application granted granted Critical
Publication of CA1138534A publication Critical patent/CA1138534A/en
Expired legal-status Critical Current

Links

Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24CDOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
    • F24C15/00Details
    • F24C15/006Arrangements for circulation of cooling air
    • 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
    • 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
    • H05B6/72Radiators or antennas
    • H05B6/725Rotatable antennas

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)
  • Electric Ovens (AREA)
  • Electric Stoves And Ranges (AREA)

Abstract

TWIN BAKING OVEN

Abstract of the Disclosure A twin baking oven includes two baking ovens disposed one above the other and surrounded by a common housing. The suction port of a blower associated with a microwave generator is arranged in the immediate vicinity of a cooling air inlet aperture provided within the housing.
The blower is thus prevented from drawing in heated air flowing around the peripheries of the two ovens.

Description

L3~i3~
This invention relates to a twin baking oven, preferably of the flush-mounted type, including two baking ovens disposed one above the other ancl surrounded by a common housing. The upper oven is a microwave baking oven, a space located in the uppermost part of the housing accommodating switching and control means, a microwave generator including a blower of its own and another blower communicating with cooling air ducts extending around the ovens.
In this known arrangement,. the spacific construction of the cooling air i.nlet and outlet apertures and the specific disposition of the blower make it possible for the cooling ~ air drawn in at the bottom of the houslng to be largely : bypassed around the lower baking oven so that it may flow to the upper part of the housing at a relatively low temperature, thus preventing any excessive heating of the control and regulating means accommodated in the upper part of the housing~ The thermally highly loaded microwave generator (magnetIon) has:associated therewith a blower of 20: its own, the suction~port~o~ this blower being disposed in a main ventilatlng space withln the uppermost part o~ the housing.
.: : It is a primary object of the present invention to provide an additional improvement as regards the cooling of, and~the dissipation of heat from, those components:that are sub:ject to particularly hiyh thermal loads and/or :
are particularly sensi~ive to heat.
According~to this i.nvention this object is attained ; by~dlsposing the:blower:associated with the microwave gen-3:b~ erator in such a~;way~that the suction port of said blower ~: i5 ~rranged in the immediate vicinity~of a~cooling air ~ : -, --inlet aperture with which said housing is provided. Theblower is thus prevented from drawing in heated air flowing around the peripheries of the two ovens; in other words, the arrangement is such that the blower draws in air directly at a point located on the outside of the housing.
In accordance with an aspect of the invention there is provided a twin baking oven including two bakin~
ovens disposed one above the other and surrounded by a common housing, the upper oven bein~ a microwave baking oven, wherein a space located in the uppermost part of the housing accommodates switching and control means, a microwave generator, said generator including a first blower for providing cooling air to said microwave generator, wherein a second blower is provided, said second blower having an input port in communication with cooling ducts surrounding said ovens and an exhaust port in comm~nication with substantially enclosed hot air exhaust duct, and wherein said first blower has an input port disposed in the immediate vicintiy of a cooling air inlet aperture of said housing, and an exhaust port ;n communication with said substantially enclosed hot air exhaust duct.
According to an embodiment of the invention it is of particular advantage to provider at the front of the housing and a~ove the control panel, and in association with the upper oven, a horizontal ventilating strip, one part of said strip, which preferably extends over about two-thirds of its length, communicating with a substantially en~losed hot air exhaust duct, and the -remaining part of said strip forming the said cooling air inlet aperture behind which the suction port of the blower is disposed.
According to another feature of an embodiment of this invention, the thermally highly loaded and/or heat-sensitive electric and electronic components are disposed in the cooling air flow path between the suction port of the blower associated with the microwave generator and cooling air inlet apertures which are preferably provided in the rear and side walls of the housing. This arrangement makes is possible for the blower associated with the microwave generator to be utilized for the additional purpose of providing for an even more intense cooling of the particularly highly loaded and/or particularly sensitive components which would be cooled less intensely if only the general hot air stream rising within the housing were relied upon for the provision of a cooling effect.
The invention may be carried into practice in a number of ways but a specific embodiment will now be described by way of example with reference to the accompanying drawings, in which:-- 2a -1~3~53~

Figs. 1 and 2 show two different perspective views of a twin baking oven in accordance with such embodiment; and Fig. 3 is a partial exploded view of certain details of the embodiment of Figs. 1 and 2.
The twin baking oven shown in the drawings may be mounted in a piece of furniture (not shown), constructed, for example, of wooden panels including side wall panels, a cover panel and a bottom panel defining a space that is adapted to receive the twin baking oven. The external surfaces of the twin baking oven accommodated by the piece of furniture are constituted by a housing 1 comprising opposed side walls
2 and 3, a rear wall 4, a bottom 5 and a cover 6. Mounted in the housing or frame formed by the said components are a lower baking oven 7 provided on its front side with a hinged door including a glass window 9 and a handle 10, which lower oven may comprise conventional heating elements such as a grilling radiator as well as additional upper and lower heating elements, and an upper baking oven 11 in the form of a microwave oven which is also provided with a hinged door 12 carrying a handle 13. A shielding plate 14 is provided between the upper oven 11 and the lower oven 7, and another shielding plate 15 beneath the lower oven, which, together with the shielding plate 14, separates the space containing the lower oven from the remaining space in the housing so as to provide two separate duct systems. Extending between the lower shielding plate 15 and the housing bottom 5 is a horizontal cooling air duct 16 which communicates with cooling air inlet apertures 17 formed in a lower ventilating strip 18. The upper part of the housing and the upper oven 11 associated therewith are separately shown in Fig. 3 wherein, for the sake of clarity, a control panel 19 disposed on the front side of the housing and above the upper oven 11 113~S34 and assoc.ated with both ovens, has been displaced upwardly.
The upper edge of the control panel 19 which is provided with a timing clock 20 and controls 21 is bordered by a ventilating strip 22 provided with a hot air outlet aperture 23 which, in the present embodiment extends two-thirds of the length of the strip. The strip 22 is further provided with a cooling air inlet aperture 24 extending approximately one-third the length of the strip. In communication with the hot air outlet aperture 23 there is provided a substantially enclosed hot air exhaust duct 25 which communicates, at its end remote from the ventilating strip, with the delivery port of a blower 26 adapted to produce a transverse air stream and with a waste air duct 27 which in turn communicates with the interior of the oven 11. Within the ventilating space in the uppermost part of the housing, the lower boundary o~ which space is formed by the top of the upper oven 11, with its upper boundary being formed by the housing cover 6, there is disposed a microwave generator generally referenced 28 including a transformer 29, the 2Q components 28 and 29 being inserted into a cooling air duct 30 one end of which communicates with the delivery port of a second blower 31 and the other end of which is connected to the baking chamber of the upper oven 11. Blower 31 is positioned in su~h a manner that its suction port lies immediately behind the cooling air inlet aperture 24 of the ventilating strip 22 so that the blower 31 may directly draw in ambient air as cooling air from the outside of the unit as indicated by the arrows in Fig. 3. This cooling air stream flows through air duct 30 where it serves to provide for intense cooling of the microwave generator 28. As also indicated by arrows in Fig. 3, the warm or hot waste air ~138534 escaping from the interior of the oven 11 is conducted via the waste air duct 27 to the exhaust duct 25 to be discharged from the oven unit via the outlet aperture 23 together with the hot air flowing around the two ovens and entering the upper part of the housing under the influence of natural convection and of the suction effect produced by the blower 26. Fig. 3 shows that the suction port of the blower 31 is arranged in an off-center position in the ventilating space in the vicinity of the housing side wall 2, the same being true of other elements (not shown) including electric and/or electronic components that are either subject to high thermal loads or are particularly sensitive to heat. As compared to the side wall 3 of the housing, the opposed side wall 2 is provided with upper cooling air inlet apertures 32 which are more numerous than inlet apertures 33 formed in the lower parts of side walls 2 and 3, the apertures 32 being arranged in the vicinity of the upper edge of side wall 2. In this manner there is produced between the suction port of the blower 31 and its inlet apertures 32 a forced cooling air stream indicated by arrows in Fig. 1, this air stream coming into contact with the aforementioned components including the control elements, the transformer 29 and the like, without being intermixed to any significant extent, with the general hot air stream. Similar inlet apertures may be additionally provided in the rear wall 4 of the housiny.

Claims (4)

The embodiments of the invention in which an exclusive property or privilege is claimed are defined as follows:
1. A twin baking oven including two baking ovens disposed one above the other and surrounded by a common housing, the upper oven being a microwave baking oven, wherein a space located in the uppermost part of the housing accommodates switching and control means, a microwave generator, said generator including a first blower for providing cooling air to said microwave generator, wherein a second blower is provided, said second blower having an input port in communication with cooling ducts surrounding said ovens and an exhaust port in communication with substantially enclosed hot air exhaust duct, and wherein said first blower has an input port disposed in the immediate vicintiy of a cooling air inlet aperture of said housing, and an exhaust port in communication with said substantially enclosed hot air exhaust duct.
2. The twin baking oven of claim 1, wherein a horizontal ventilating strip is arranged on the front side of the housing above a control panel of the upper baking oven, one part of said strip extending approximately two-thirds of the length of the strip and communicates with said exhaust duct while the remaining part of said strip defines said cooling air inlet aperture.
3. The twin baking oven of claim 1, wherein highly thermally loaded and heat-sensitive electric and electronic components are disposed in a cooling air flow path extending between the suction port of the first blower and cooling air inlet apertures formed in at least one wall of the housing.
4. A twin baking oven according to claim 3, wherein the suction port of the first blower and said thermally highly loaded and heat-sensitive components are disposed in an off-center position and in the vicinity of a housing side wall in a ventilating space located above the upper baking oven, said side wall being provided with a larger number of cooling air inlet apertures than the opposed side wall.
CA000328770A 1978-06-09 1979-05-29 Twin baking oven with microwave energy source Expired CA1138534A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DEP2825461.7 1978-06-09
DE19782825461 DE2825461A1 (en) 1978-06-09 1978-06-09 DOUBLE OVEN, IN PARTICULAR BUILT-IN OVEN

Publications (1)

Publication Number Publication Date
CA1138534A true CA1138534A (en) 1982-12-28

Family

ID=6041480

Family Applications (1)

Application Number Title Priority Date Filing Date
CA000328770A Expired CA1138534A (en) 1978-06-09 1979-05-29 Twin baking oven with microwave energy source

Country Status (5)

Country Link
US (1) US4354084A (en)
JP (1) JPS55900A (en)
AU (1) AU522608B2 (en)
CA (1) CA1138534A (en)
DE (1) DE2825461A1 (en)

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Also Published As

Publication number Publication date
AU4698479A (en) 1979-12-13
DE2825461A1 (en) 1979-12-13
JPS55900A (en) 1980-01-07
US4354084A (en) 1982-10-12
DE2825461C2 (en) 1988-02-04
AU522608B2 (en) 1982-06-17

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