Electric heating – Heating devices – Combined with container – enclosure – or support for material...
Patent
1995-06-05
1997-12-02
Walberg, Teresa J.
Electric heating
Heating devices
Combined with container, enclosure, or support for material...
126 21A, A21B 126
Patent
active
056932421
DESCRIPTION:
BRIEF SUMMARY
This invention is related to a convection air oven of the type comprising a polygonal base housing, inside of which is defined a cavity which constitutes the cooking chamber, provided with a rotating plate and incorporating heater and impeller means for the internal circulation of hot air.
Air convection ovens are known to exist which normally pose a number of problems resulting in low efficiency and high power consumption; this is a result of deficient utilization, for various reasons, of the heat generated by the heater means.
One of the problems involving deficient power utilization is a result of the configuration of the cooking chamber, generally comprising a rectangular or quadrangular base receptacle with cold air accumulating corners which the circulating hot air is unable to reach, thereby making it difficult to achieve uniform heating of the cooking chamber, in addition to the extended heating time required.
Another factor involved in the poor utilization of the originated heat is determined by the disposition of the circulating air outlets leading to the heater means; it is evident that the hot air tends to rise by itself and therefore if hot air outlets are provided reaching up to the total height of the cooking chamber, said circulating hot air fails to be retained inside the chamber, thereby failing to take advantage of the heat as it emerges rapidly towards the heater means and thus provides a very poor heat utilization.
Another problem generally affecting air convection ovens is the emission of steam to the exterior, in view that certain phases of the cooking process require that steam be incorporated to the chamber which is then released to the exterior together with the hot air.
The convection air oven of this patent presents, among other novel aspects, two inlets into the cooking chamber, disposed in two opposite sides of the oven and having two peripheral frames around them through which emerge hot and ambient temperature, internal and external air screens, respectively.
The two walls of the cooking chamber present, in their central areas, recessed trapezoid shaped voids delimited by sides which converge towards the internal area of the walls and which conform a guide means for the hot air, both at the air entry into and exit from the cooking chamber, thus eliminating the corners and the accumulation of cold air inside the chamber, contributing to a better utilization of the heat and allowing for a faster temperature buildup in the chamber.
One of the walls encloses the heater means, and its recessed center surface comprises, in its upper portion, a humidifying chamber attached to the heater means, and in its lower portion a circulating air inlet directed to the heater means in such a manner that the circulating hot air is made to descend before being reheated and impelled once again, thereby providing very high performance with power consumption equivalent to 50% of that of a conventional oven.
The hot air passes through this lower outlet towards the heater means as a result of the suction created by the impeller means disposed above the heater means and composed of a single turbine which impels the preheated air through an overhead duct located in the oven ceiling which then passes on to a cavity located behind the opposite wall of the cooking chamber.
This opposite wall, which presents in its central recessed area a series of vertically extending grooves through which the hot air exits and is then distributed throughout the interior of the cooking chamber, also presents two other adjustable amplitude outlets which slightly converge towards the interior of the chamber and through which emerge peripheral hot air streams.
The wall of the cooking chamber closer to the heater means is fitted, adjacent to the chamber inlets, with vertical adjustable magnitude outlets communicating with the overhead duct through duct branches, the emerging hot air defining hot air streams which act on the sides of the main stream coming from the other wall and which circulates in the opposite direction and
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Pelham J.
Walberg Teresa J.
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