Mitsubishi Heavy Industries Limited

Mitsubishi Hitachi Power Systems, Ltd.

Tamiaki Nakazawa

Rimpei Kawashita

Ryokichi Hombo

Takashi Nakano

Makoto Kondo

Shin Asano

Megumu Tsuruta

Takumi Hori

Yasuyuki Tatsumi

Tsuyoshi Miyabe

Masaru Nishikatsu

A steam turbine includes a flow guide placed about a rotor shaft and forming a side wall of a diffuser. The flow guide is formed in such a substantially truncated conical shape that a first portion having a semi-circular-arc cross section and a second portion having a semi-circular-arc cross section and exhibiting less thermal deformation than the first portion are combined together. A coupling portion of the first portion with the second portion has a first protrusion protruding, in the circumferential direction thereof, more on a rotor shaft side than on a steam flow path side of the diffuser. A coupling portion of the second portion with the first portion has a second protrusion protruding, in the circumferential direction thereof, more on the steam flow path side of the diffuser than on the rotor shaft side and overlapping with the first protrusion in the radial direction of the flow guide.

Steam turbine

An object of the present invention is to provide a turbine external compartment, a frame for a turbine external compartment, and a method of constructing a frame for a turbine external compartment that can improve a flow of steam inside of the compartment and can enhance the rigidity of the compartment using a simple structure. A turbine external compartment according to the present invention is placed in a frame having a steel-plate reinforced concrete structure obtained by filling a space between a plurality of steel plates with concrete. The turbine external compartment includes a lower half part having a side plate part or an end plate part made of the steel plates that constitute the frame.

Turbine external compartment, frame for turbine external compartment, and method of constructing frame for turbine external compartment

A stack ring is formed by an outer ring and an inner ring and is inserted in an annular gap formed between an inlet sleeve and an inner casing. The outer periphery of the outer ring and the inner periphery of the inner ring each have a land part having a flat face and taper faces formed on upper and lower sides of the land part. A ratio of Lto Lis 0.3 to 0.7 where Lis a length of the land part and Lis a total length in the up-down direction. A ratio of S to Sis not less than 0.95 where S is an area of the cross sectional shape of the outer ring or the inner ring and Sis an area of a virtual rectangle BCDE and the taper faces have an inclined angle of 1&#xb0; to 10&#xb0;.

Sealing structure for steam turbine

A steam turbine casing position adjusting apparatus capable of employing a compact low-resolution actuator is provided. A steam turbine casing position adjusting apparatusincludes turbine casingsand, a rotor, and actuatorsandthat move the turbine casingsandin the axial direction. The actuatorsandare disposed radially outside outer peripheries forming the turbine casingsand

Steam turbine casing position adjusting apparatus

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

Casing structure of steam turbine

A sealing mechanism includes a pair of space forming rings which face each other and are configured for surrounding a shaft body, an outer bellows-joint having one end connected to an outer periphery of one of the space forming rings and another end connected to an outer periphery of the other of the space forming rings, and an inner bellows-joint having one end connected to an inner periphery of one of the space forming rings and another end connected to an inner periphery of the other of the space forming rings. Each of the inner bellows-joint and the outer bellows-joint is a corrugated plate. The space forming rings space the inner bellows-joint and the outer bellows-joint apart from each other such that the inner bellows-joint and the outer bellows-joint do not come in contact with each other.

Sealing mechanism with bellows and steam turbine provided with the sealing mechanism

A first seal member includes a double-structure bellows in corrugated form, and vibration control device provided on the outside of the bellows such as to cover part of the bellows. A flat portion that is not in corrugated form is provided in part of the bellows. The vibration control device is provided in circumferential direction on an outer surface of the flat portion, and made up of a ring-shaped rib having a plurality of holes in a circumferential direction and weights inserted in the holes provided in a wall of rib. Natural frequency is adjusted by adjusting the number of weights, thereby preventing resonance between the natural frequency of the first seal member and the rotational frequency of rotor from occurring.

Growing community of inventors

Tokyo, Japan

Tamiaki Nakazawa