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AssigneeAlstom (Switzerland) Ltd
InventorsAndrew Baxter, Vladimir Navrotsky, Mirjana Mihelic, Matthias Rothbrust
Estimating the term…
In an exhaust gas housing (1) of a thermal engine, a radially outer housing casing (9) and a radially inner housing casing (10) arranged on the hub side are connected to one another via at least one thermally insulated carrying rib (3) acted upon by a cooling medium. A carrying rib (3) has at least two passage ducts (7) and (8) for the cooling medium, at least one passage duct (7) possessing a cooling medium supply (6) and at least one passage duct (8) possessing a cooling medium outlet (12), and these passage ducts (7) and (8) being in communicating connection in the radially inner hub-side end region via a deflection duct (11). The cooling medium is led from an external pressure source (5) through the carrying rib (3) to the region of the deflecting duct (11) arranged on the hub-side casing (10) and from there through the carrying rib (3) back again into a collecting duct (15) which issues preferably into an annular duct (26) for cooling the exhaust gas housing flange (24).
An exhaust gas housing (1) of a thermal engine, at least comprising a radially outer exhaust gas housing casing (9) and, at a distance from this, a radially inner exhaust gas housing casing (10) arranged on the hub side, said casings delimiting an annular exhaust gas duct (23), and a plurality of carrying ribs (3) bridging the exhaust duct (23) and cooled by means of a fluid cooling medium, characterized in that the carrying ribs (3) have at least two passage ducts (7) and (8) for the cooling medium, at least one passage duct (7) possessing a cooling medium supply (6) and at least one passage duct (8) possessing a cooling medium outlet (12), and these passage ducts (7) and (8) being in communicating connection in one end region via a deflecting duct (11).
The exhaust gas housing as claimed in one of the preceding claims, characterized in that the passage ducts (8) of the carrying rib (3) issue into a collecting duct (15) which communicates with the exhaust gas duct (23) of the thermal engine.
The exhaust gas housing as claimed in one of the preceding claims, characterized in that the collecting duct (15) issued into an annular duct (26), which annular duct (26) at least partially shields the thermally stressed surface (25) of the exhaust gas housing flange (24).
The exhaust gas housing as claimed in one of the preceding claims, characterized in that the carrying ribs (3) are sheathed with a heat-insulating material (22).
The exhaust gas housing as claimed in one of the preceding claims, characterized in that the thermal engine is a gas turbine plant.
A method for cooling the carrying ribs (3) of an exhaust gas housing of a thermal engine by means of a fluid cooling medium, said exhaust gas housing consisting of an outer casing (9) and of an inner casing (10), characterized in that the cooling medium enters at least one passage duct (7) of the carrying rib (3) in the region of the outer housing casing (9), flows through this passage duct (7) as far as the region of the inner housing casing (10), is deflected there and flows in countercurrent, in at least one passage duct (8), through the carrying rib (3) as far as the region of the outer housing casing (9).
Dependencies are inferred from the claim text.