Appeal No. 2004-1622
Application No. 09/431,178
1. A component which can be subjected to high thermal
loading and to which a hot-gas flow can be admitted during
operation, the component comprising:
at least one hot-gas side for exposure to the hot-gas flow
and a cold-gas side not for exposure to the hot-gas flow;
component cooling passages connecting the hot-gas side and
the cold-gas side so that when a cooling medium flows from the
cold-gas side to the hot-gas side, the cooling medium, when
passing through a component passage, absorbs heat from the
component and draws off the heat to the hot-gas side;
wherein at least one of the component cooling passages has a
length, a hot-side orifice, a cold-side orifice, and a circular
cross section over the entire length of the at least one
component cooling passage, which cross section increases
continuously from the cold-gas side to the hot-gas side, the at
least one component cooling passage enclosing an opening half
angle so that the at least one component cooling passage is
frustoconical;
wherein the opening half angle of the at least one component
cooling passage is essentially constant over the length of the
passage;
wherein the opening half angle is between 0.2E and 2.5E; and
wherein a ratio of the cross-sectional area of the hot-side
orifice of the at least one component cooling passage to the
cross-sectional area of the cold-side orifice of the at least one
component cooling passage is less than 1.2.
THE EVIDENCE
The item relied on by the examiner as evidence of
obviousness is:
Howald 3,527,543 Sep. 08, 1970
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