Mitsubishi Heavy Industries Limited

Kei Nakanishi

Hideaki Sugishita

Kazuyuki Matsumoto

Yoshihiro Kuwamura

Toyoharu Nishikawa

An exhaust hood (Ec) of the present invention is provided with an inner casing (), an outer casing (), and a diffuser (). The inner casing () surrounds a rotor from the outside in a radial direction, and forms a first space () in which a fluid flows in an axial direction (Da) between the rotor and the inner casing (). The diffuser () is provided with a bearing cone () that has a diameter that gradually widens moving towards an axial downstream side (Dad) and forms a cylindrical shape extending to the axial downstream side (Dad) to be continuous with the outer circumferential surface of a rotor shaft that forms the first space (). An end edge () on the axial downstream side (Dad) of the bearing cone () forms an oval shape in which, in a direction orthogonal to an axial line (Ar), a distance (R) between the axial line (Ar) and a second cone end part () of a second side (Dan) is greater than a distance (R) between the axial line (Ar) and a first cone end part () of a first side (Dex).

Exhaust hood and steam turbine

A steam turbine exhaust chamber defining therein an exhaust passage through which steam having passed through a last-stage blade of a steam turbine is introduced to a condenser includes: a casing including an outer peripheral wall portion formed on an outer peripheral side of the exhaust passage; a bearing cone disposed on a radially inner side of the outer peripheral wall portion; and at least one bypass passage carrying a part of steam flowing through the exhaust passage from a high-pressure portion of the exhaust passage to a low-pressure portion of the exhaust passage or to the condenser, The at least one bypass passage includes a high-pressure-side opening formed in the bearing cone and a low-pressure-side opening facing steam having a lower pressure than steam facing the high-pressure-side opening.

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Tokyo, Japan

Kei Nakanishi