Compartment structure for steam turbine

Abstract

In a steam turbine according to a first embodiment, an outer casing 11 is divided into an upper casing 31 and a lower casing (a lower block) 32 on a horizontal plane through which a rotor passes, and the upper casing 31 is divided into a middle block 33 having a through hole 20 and an upper block 34 having a top panel 31a, that is, into a portion including at least a part of the through hole 20 through which the rotor penetrates and other parts. With this configuration, machining of a bellows fitting unit provided in an end-plate cone portion 21A can be performed in existing facilities such as a factory, in a state that the lower block 32 and the middle block 33 are assembled without assembling the upper block 34.

Description

technical field [0001] The present invention relates to a machine room structure of a steam turbine that generates electricity by rotating a rotor driven by steam. Background technique [0002] In a general steam turbine, an inner machine room is provided in an outer machine room, and a steam inlet portion is provided at the upper part thereof, and a rotor is rotatably supported at the center, and a plurality of moving blades are fixed to the rotor, and the other On the one hand, multiple segments of stationary blades are fixed on the blade ring supported by the inner machine chamber, and are arranged alternately with the moving blades fixed on the rotor. [0003] Therefore, when the steam turbine is in operation, if steam enters the internal machine chamber from the steam inlet, the steam will be sprayed out to the moving blades through the partition wall and the stationary blades supported by the blade ring, so that the rotor rotates and drives the rotor connected to the r...

AI Technical Summary

Problems solved by technology

[0010] However, in the conventional machine room structure of a steam turbine, in the assembled state, the axial deviation of the bellows mounting part where the bellows is mounted needs to be machined into a flat surface. Therefore, if the outer machine room becomes larger, Then there is a problem that the bellows mounting part cannot be machined in the state of being assembled up and down integrally.

[0011] In addition, in order to assemble the enlarged external machine room vertically, or to lift the upper part of the external machine room during periodic inspections, etc., it is necessary to increase the height of the building, so there is a possibility that the external machine room cannot be integrated vertically. Assembly, or the inability to lift the upper part of the external machine room

[0012] In addition, even if the external casing is assembled vertically and the bellows mounting part is machined, there is a problem that the casing cannot be transported from the factory in the state where the casing is assembled vertically.

[0013] In addition, in order to perform machining in the state where the external machine room is assembled, it is necessary to process with a horizontal processing machine, but there is a problem that it is difficult to maintain the machining accuracy if the position of the bellows mounting part is high.

[0014] In addition, since the enlarged external machine room cannot be accommodated in the processing table, there is a problem that machining cannot be performed in the state where the external machine room is placed horizontally.

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