Hitachi, Ltd.

Babcock-hitachi Kabushiki Kaisha

Kazuo Ikeuchi

Kiyoshi Namura

Masakazu Takasumi

Eiji Saito

Katsukuni Hisano

Tsuguaki Koga

Yutaka Yamashita

Masumi Katayose

Tomoaki Inoue

Yoshiaki Yamazaki

Yoshio Shikano

Tetsu Imai

Katsumi Oyabu

Makoto Nishimura

Takeshi Sato

Tetsuo Sasada

Yoshiki Noguchi

Ryoichi Kaneko

Haruo Urushidani

Shigehisa Sugita

Shigeyoshi Kawano

Hideo Yoda

Kinpei Okano

Ichiya Sato

Takao Yoneyama

Eiji Saitou

Taro Sakata

Kunio Tsuji

Hazime Sibaoka

Masato Machida

Akira Isida

A turbine moving blade has a blade portion extending from the basal portion to the tip of the moving blade. The blade root portion is formed at the basal portion of the blade portion and engaged with a corresponding disk groove of a turbine rotor on a one-by-one basis, and the integral cover is formed at the tip of the blade portion integrally with the blade portion. The integral cover includes at least a pair of pressure and suction sloped surfaces inclined relative to the direction of the rotational axis of a turbine so as to restrain the elastic restoring force of the moving blade torsionally deformed at the time of installation of the moving blade by bringing the integral covers of mutually adjacent blades into contact.

Turbine moving blade

The present invention relates to a turbine bucket to be provided at the low pressure last stage of a steam turbine and an object of the present invention is to provide a turbine bucket in which the adjacent blades are connected without using a connecting member at a blade intermediate portion. In order to achieve the object of the present invention, a turbine bucket of the present invention is formed in such a manner that the blade sectional configuration is twisted from a blade root portion to a blade tip side, and when assuming two axial directions in a blade section of the bucket on horizontal plane and taking one axial direction as X axis and the other axial direction perpendicular to X axis as Y axis, the blade sections at predetermined heights from the blade root portion of the turbine bucket are formed in a range of &#xb1;0.3 mm from respective points defining blade section configurations as shown respectively in chart 1, chart 4, chart 7, chart 10, chart 13, chart 16 and chart 18.

Turbine bucket

The present invention is a turbine bucket for at the low pressure last stage of a steam turbine and in which the adjacent blades are connected without using a connecting member at a blade intermediate portion. A turbine bucket of the present invention is formed that the blade sectional configuration is twisted from a blade root portion to a blade tip side, and when assuming two axial directions in a blade section of the bucket on horizontal plane and taking one axial direction as X axis and the other axial direction perpendicular to X axis as Y axis, the blade sections at predetermined heights from the blade root portion of the turbine bucket are formed in a range of &plusmn;0.3 mm from respective points defining blade section configurations.

A steam turbine is provided with moving blades which are affected less by erosion and fretting wear due to water and have a high reliability in strength. The moving blades are twisted moving blades, each provided with a blade portion and a shroud portion formed at its tip and a contact surface between shroud portions connecting adjacent moving blades whereby an extension plane of the contact surface toward the blade back side does not intersect with the blade tip of the blade back side shroud portion.

Steam turbine

The total number (M) of plural blades of a blade apparatus is selected so as not to be a prime number and not to be a power multiplier of a prime number. Plural blades are divided into at least a first blade group in which one blade group has the blades of a first integer number (N.sub.1) and a second blade group in which one blade group has blades of a second integer number (N.sub.2). Each of the first integer number (N.sub.1) and the second integer number (N.sub.2) have no common divisor except 1. The total number (M) of plural blades is the product of the first integer number (N.sub.1) and the second integer number (N.sub.2). The blades of the first integer number (N.sub.1) blade group are connected by a first stage connecting member and the blades of the second integer number (N.sub.2) blade group are connected by a second stage connecting member.

Fluid machinery having blade apparatus and blade apparatus for fluid

A pressurized fluidized-bed boiler power plant comprises: a pressurized fluidized-bed boiler including a fluidized-bed boiler and a pressure vessel containing the fluidized bed; a single-shaft gas turbine including a gas turbine, an air compressor and an electric generator; and a steam turbine unit in which steam generated by the pressurized fluidized-bed boiler drives a turbine so that electricity is generated. In the power plant, an air cooler is situated on a duct for conveying the compressed air from the compressor to the boiler or at an inlet of the compressor. Alternatively, there may be provided a device for conveying the compressed air from the compressor by way of the air cooler to a space formed by the fluidized-bed boiler and the pressure vessel of the pressurized fluidized-bed boiler. During operation, the compressed air is cooled to a temperature level allowable for the pressure vessel before it is supplied to the boiler.

Pressurized fluidized-bed boiler power plant

A stage structure of an axial turbine includes a stationary inner ring, a stationary outer wall, a row of stationary blades mounted on the stationary inner ring and outer wall, a row of moving blades, and a shroud ring mounted on the tips of the moving blades. An annular solid substance, disposed immediately downstream of an axial gap formed between an axial end of the shroud ring and surface of the outer wall axially facing the axial end of the shroud ring, reduces an expansion space provided immediately downstream of the axial gap, whereby circulation of an ejection flow from a main stream through the axial gap is reduced so that the turbine stage efficiency is improved. The annular solid substance may be a ring fixed to the stationary outer wall, a protrusion or a cylinder formed by a portion of the outer wall.

Turbine stage structure

A method and apparatus for detecting the occurrence of rubbing in a rotary machine, in which at least one acoustic sensor is mounted on at least the rotor part or the stator part of the rotary machine, and the output signal from the acoustic sensor is detected and then filtered to extract a frequency component having a frequency substantially equal to the rotational frequency of the rotary machine, so as to detect the occurrence of rubbing in the rotary machine as early as possible and also to locate the source of the rubbing. Even when the occurrence of abnormal metal-to-metal contact at a bearing of the rotary machine is detected, it is discriminated from rubbing so that the occurrence of the rubbing can be reliably detected.

Method and apparatus for detecting rubbing in a rotary machine

A method of and a system for monitoring the conditions of a journal bearing having a bearing surface for supporting a rotatable shaft through an oil film. Detectors detect the speed of rotation of the shaft and the pressure of the oil film. The load on the journal bearing is calculated based on the rotational speed of the shaft and the pressure of the oil film.

Method of and system for monitoring bearing conditions

A device for connecting the turbine blades of a turbine having a plate-shaped member provided at the radially outer end of each turbine blade and extended substantially at a right angle to the longitudinal plane of the turbine blade. The plate-shaped member is projected from the leading and trailing edges of the turbine blade, and is provided with through bores formed in each projected portion. Connecting members having cylindrical pins or the like projections are disposed between two adjacent turbine blades in such a manner that the projections are rotatably received by respective through bores. Namely, one of the connecting members is connected to the plate-shaped member of the leading edge of the turbine blade while the other connecting member is connected to the plate-shaped member of the trailing edge of the preceding adjacent turbine blade. The connecting members are disposed such that they partially underlie the plate-shaped members of the adjacent turbine blades and that they make contact with each other during the running of the turbine thereby to restrict the untwisting of the turbine blades while attaining a vibration damping effect.

Device for connecting turbine blades

A method of and an apparatus for diagnosis of the operating conditions of a bearing wherein pressures of a film of oil formed on a sliding surface of the bearing journalling a rotary shaft are detected at a plurality of points on the sliding surface, and the pressure differential between the pressures of the oil film detected at the plurality of points is calculated. The deflection of the bearing with respect to the rotary shaft is calculated based on the calculated oil pressure film pressure differential, so that the operating conditions of the bearing are judged based on the deflection thereof.

Method of diagnosis of operating conditions of bearing and apparatus

A turbo machine rotor assembly which includes a turbine wheel having moving blade covers or connecting pieces connected to adjacent moving turbine blades. Each of the moving turbine blades includes a first ledge and second ledge at a leading edge and trailing edge side portions, respectively, of the tip of the blade with the first and second ledge portions extending substantially in tangential directions of the turbine wheel but in opposite directions to each other. One of the first and second ledges is provided with a through hole or aperture extending radially of the turbine wheel. The moving blade cover or connecting piece is provided with a pair of spaced pins receivable in the apertures of the first and second ledges for connecting the first ledge of one moving turbine blade and the second ledge of an adjacent moving turbine blade in such a manner that the upper surface of the cover contacts with the lower surfaces of the first and second ledges. One of the pins is loosely fitted in one aperture and the other pin is provided with a flared head portion for rotatably fixing the connecting piece between adjacent turbine blades. The moving blade cover can bear a large centrifuged force and does not constrain the torsions of the moving turbine blades during the rotation of the turbine wheel.

Turbomachine rotor assembly

The annular array of radially extending blades on the rotor of a rotary fluid machine are tied together at generally their mid portions by interlocking separate tying members and projection pairs, wherein each projection pair includes facing projections on adjacent blades of the array. The tying members and projections have mating bearing surfaces that will provide a tangential force as a result of wedging produced by the centrifugal force acting upon the tying members during rotation of the rotor at rated speed, without restraining individual twisting of the blades about their radial extent.

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Hitachi, Japan

Kazuo Ikeuchi