Stoves and furnaces – Stoves – Cooking
Patent
1988-10-18
1990-01-09
Yeung, James C.
Stoves and furnaces
Stoves
Cooking
126 20, 432200, 219400, 34191, 99474, 99443R, F24C 1532
Patent
active
048920835
DESCRIPTION:
BRIEF SUMMARY
The invention refers to a baking oven having a baking chamber being accessible via a door and being designed for introducing therein a carriage carrying the baking good and being stationary during the baking process, said baking oven comprising two air channels extending laterally of the baking chamber at both sides thereof over the effective height of the baking chamber and being each separated from the baking chamber by a partition provided with a plurality of air passage openings, said air channels being during the baking process alternately supplied by a blower and via a switching equipment with hot air being heated by a heating means and being humidified by a vapor supply means and transversely passing the baking chamber in alternating direction and being subsequently again sucked back along a closed circuit to the suction side of the blower, noting that the blower and the heating means are arranged at a higher level than the baking chamber and at least partially above said baking chamber and noting that the cover wall of the baking chamber is tightly closed.
In such a known construction (AT-PS No. 326 063), there is obtained the advantage of a small width of the baking oven and of a uniform gas flow through the baking chamber in a nearly horizontal direction. It is, however, disadvantageous that the flow resistances for both flow directions of the hot air stream are unequal and that considerable flow losses occur for at least one flow direction before hot air can arrive at the baking good. This may have a disadvantageous effect on sensible types of baking good.
From EP-A No. 2784 it is known to arrange for a baking oven, in which a vortex zone of the hot air is transversely moved through the baking oven in alternating direction, a switching equipment centrally above the baking chamber for the purpose of obtaining an equal air supply to two air channels vertically extending at both sides of the baking chamber. The drawbacks resulting from un equal flow resistances for both flow directions of the hot air stream are, however, not completely avoided in this construction, and further turbulences are introduced into the air stream to be fed into the baking chamber and a pressure drop is caused by a blower arranged downstream of the heating means.
It is an object of the invention to avoid these drawbacks and to provide for an equalized supply of warm air in both directions of the stream of warm air. This task is, according to the invention, solved in that the heating means is arranged at the suction side of the blower within the path of return flow of the hot air and in that a channel being directed against the cover wall of the baking chamber is connected to the pressure side of the blower and has its lower end located in the central area between said both air channels leading to two air supply channels extending above the cover wall of the baking chamber and being connected to said both air channels, noting that the switching equipment is arranged within this lower end of the channel between said both air supply channels. Thus, there result for both directions of the stream of warm air symmetric or nearly symmetric conditions and simultaneously there results a reduction of the flow resistances within that portion of the warm air circuit, through which the air must flow to arrive from the blower to the baking chamber. While in the construction according to the invention the air flows, for both flow directions, from the pressure side of the blower via the switching means and the respective air supply channel into the air channel connected to said channel and supplying the air into the baking chamber via openings of the partition, the air is, in the first described known construction, compelled to flow, for the one flow direction, from the pressure side of the blower via the heat exchanger into the air channel delimited by the partition. Because the heat exchanger must, for becoming effective, oppose to the air a considerable flow resistance. this means for this flow direction a drawback relative to the othe
REFERENCES:
patent: 3861378 (1975-01-01), Rhoads et al.
patent: 4032289 (1977-06-01), Johnson et al.
patent: 4782214 (1988-11-01), Voegtlin
patent: 4785151 (1988-11-01), Voegtlin
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