| 摘要 |
A drainage hole structure in a cooking oven of forced convection type, utilizing: a drain pipe arranged so that an upper end opening thereof is open to a bottom face portion of a heating chamber and a lower end opening thereof is open to the outside of the heating chamber; and an air suction pipe arranged so that one end opening thereof faces to the upper end opening of the drain pipe in close proximity thereto and the other end opening thereof is open to a middle portion in the heating chamber, wherein the one end opening of the air suction pipe is formed to be slightly larger than the upper end opening of the drain pipe, and in the upper end opening side of the drain pipe, a peripheral wall portion of the drain pipe positioned in an upstream side with respect to an airflow flowing along the bottom face portion of the heating chamber is extended so as to enter into the one end opening of the air suction pipe by only a short distance, while a peripheral wall portion of the drain pipe positioned in a downstream side with respect to the airflow flowing along the bottom face portion of the heating chamber is terminated at a level substantially equal to or lower than the bottom face portion of the heating chamber.
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