Electric heating – Microwave heating – Waveguide applicator
Patent
1998-08-06
2000-11-28
Leung, Philip H.
Electric heating
Microwave heating
Waveguide applicator
219699, 219701, 219746, 219750, 219762, H05B 678, H05B 674
Patent
active
06153868&
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a device for applying microwaves for the treatment, in particular the cooking, of relatively small or thin individual products, disposed on a metallic support. There is meant by microwaves the frequency band of electromagnetic waves comprised between 300 MHz and 300 GHz.
SUMMARY OF THE INVENTION
The object of the invention is to provide a structure adapted particularly for cooking food products, for example biscuits, in place on a metallic surface and capable of operating, during very substantially reduced times relative to the cooking time in conventional ovens with pulsed hot air cooking and/or infrared cooking, with comparable cooking quality and under very good conditions of safety in spite of the use as a cooking support for said products a metal surface, for example a fixed grill or bottom or a conveyor belt.
To this end, the invention has for its object a device for applying microwaves particularly for cooking products on a metallic support, comprising at least one microwave generator and a metallic waveguide, particularly of rectangular cross section, characterized in that said waveguide forms a cooking chamber whose floor is constituted by a removable flat metallic support on which are disposed the products to be cooked.
Preferably, the waveguide is connected to the microwave generator by an auxiliary guide whose axis forms relative to the axis of said guide, an angle equal to the Brewster angle or near it, and such that the electric field will be in a plane perpendicular to the flat metallic support.
According to one embodiment, said flat metallic support is a base or plate stationary relative to the upper inverted U-shaped portion of the microwave guide during application of the microwaves, the two ends of the guide being provided with closure-confinement means for the cooking chamber thus formed.
According to another embodiment, said flat metallic support is a conveyor belt, the two ends of the guide being if desired provided with means suitable to limit the escape of waves to the exterior to below tolerated values, the direction of movement of the belt being parallel to the axis of the guide.
Preferably, according to a second embodiment, the device of the invention comprises a plurality of waveguides twinned in parallel forming a mono-mode microwave cavity, the lower horizontal portion of the guides being formed by a common conveyor belt.
As a modification, such a conveyor belt, whether the waveguide is mono or multi-conduit, serves several waveguide cavities arranged in cascade above the upper run of the belt, such that the products are subjected in the course of their movement along the conveyor belt, to a succession of microwave applications.
BRIEF DESCRIPTION OF THE DRAWINGS
Other characteristics and advantages will become apparent from the description which follows, of embodiments of the invention, which description is given by way only of example and with regard to the accompanying drawings, in which:
FIG. 1 is a schematic vertical cross-sectional view of a first embodiment of a device according to the invention;
FIG. 2 is a schematic vertical cross-sectional view of a second embodiment, and
FIG. 3 is a schematic side view of a modified embodiment of the device of FIG. 2.
DETAILED DESCRIPTION OF THE INVENTION
In FIG. 1, there is shown at 1 a microwave of rectangular cross section comprising two side walls 2 and 3 and an upper wall 4, the lower wall being constituted by a separate flat support 5.
The guide 1 and the flat support 5 are of a metal which is a good conductor and preferably non-magnetic.
Guide 1 forms a closed chamber (the opposite ends not being shown in FIG. 1) which is open only on its lower surface, the opening being closed by the flat support 5 which is for example a base or plate on which are disposed products 6, for example biscuits, madeleines, or other bakery or viennese or pastry products of the same type, that it is desired to cook or of which it is desired to control the moisture content.
The gu
REFERENCES:
patent: 2500752 (1950-03-01), Hanson et al.
patent: 2603741 (1952-07-01), Seifried et al.
patent: 3177333 (1965-04-01), Lamb
patent: 3665491 (1972-05-01), Cooper
patent: 4999469 (1991-03-01), Dudley et al.
patent: 5177333 (1993-01-01), Ogasawara
patent: 5796080 (1998-08-01), Jennings et al.
Groupe Danone
Leung Philip H.
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