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Rotary machine

A technology for rotating machinery and rotating shafts, applied in mechanical equipment, engine functions, engine components, etc., can solve the problems of increased material and manufacturing costs, increased size of rotating machinery, increased housing size, etc., to achieve enhanced reliability and performance, maintaining The effect of enhanced precision and enhanced reliability

Inactive Publication Date: 2011-01-19
MITSUBISHI HEAVY IND LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In the case structure in which the case is divided into two on the horizontal plane as described above, the upper case and the lower case are provided with engaging flanges on the entire circumference of the horizontal plane thereof, and the joint flanges are formed from the entire circumference of the horizontal plane of the case. protruding above, and therefore there is a problem of increasing the size of the connected case itself
[0006] Moreover, when the casing size increases, there is a problem that the mass of the entire turbine increases, and the material and manufacturing costs increase
However, when the housing is divided into two on the horizontal plane, the joint surface extends over the entire circumference of the horizontal plane of the housing, so there is a problem that the range from which the working fluid leaks increases
However, the above-mentioned structure in which the casing is hermetically closed can only be used in relatively small turbines, and this structure must be replaced by a structure provided with flanges in larger turbines
In this case, there is a problem that the flange and the joint bolt protrude in the axial direction, the overall length of the case increases, and the size of the entire rotary machine increases
In this case, there is a problem that since the size of the shell increases, it is difficult to determine the rigidity of the room, and the ability of the crane to lift the shell is greatly affected
Especially in a large turbine, when the blade ring is supported in a cantilever manner, the overhang of the blade ring is formed to be long, so there is a problem that the center cannot be sufficiently maintained, and the distance between the rotating part and the stationary part in the axial direction The effect of the differential thermal expansion in the direction increases

Method used

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no. 1 approach

[0037] will refer to Figure 1-5 A casing structure having a gas turbine according to an embodiment of the present invention and a gas turbine having such a casing structure are described.

[0038] figure 1 is a schematic diagram for describing the overall structure of the gas turbine according to the first embodiment of the present invention.

[0039] Such as figure 1 As shown, a gas turbine (rotary machine) 100 includes a housing 101 constituting the outer shape of the gas turbine 100, a blade ring 3 holding the turbine stator blades 10 on its inner circumference, a rotating shaft 4 embedded with the turbine rotor blades 11, and a turbine stator. The first stage of the blade 10 provides an inlet scroll portion 5 for the working fluid, a discharge scroll portion 6 into which the working fluid discharged from the last stage of the turbine rotor blade 11 flows.

[0040] In the gas turbine 100, the working fluid is accelerated by the turbine stator blades 10, the turbine roto...

no. 2 approach

[0074] Figure 4 is a schematic diagram for describing the overall structure of a gas turbine according to a second embodiment of the present invention. The main structure of the gas turbine of this embodiment is the same as that of the first embodiment, and the holding structure of the third connecting flange is different from that of the first embodiment. In this example, reference will be made to Figure 4 Only the holding structure of the third connection flange will be described, and descriptions of other constituent elements will not be repeated. The same constituent elements as those of the first embodiment are denoted by the same reference numerals, and description thereof will not be repeated.

[0075] In the second embodiment, as Figure 4 As shown, the outer peripheral surface of flange 3A sandwiched between flanges 1A and 1B of casings 1 and 2 obtained by dividing casing 101 of gas turbine 300 into two is bonded between flanges 1A and 1B.

[0076] In the first ...

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PUM

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Abstract

To reduce the size of a rotary machine and to provide a rotary machine in which it is possible to achieve an improvement in reliability and performance of the rotary machine. A first casing (1) and a second casing (2) formed by dividing a substantially cylindrical casing (101), enclosing in the interior thereof a rotor shaft (4) in which rotor blades (11) are embedded, into two at substantially a central portion relative to an axial direction of the rotor shaft (4) are provided; a first coupling flange (1A) and a second coupling flange (2A) are provided at openings in the first casing (1) and the second casing (2), respectively; a third coupling flange (3A) is provided, which is enclosed by the casing (101), which is positioned at substantially a central portion of the length in the axial direction in a substantially cylindrical blade ring (3) holding stator blades (10) and enclosing the rotor shaft (4), and which holds the blade ring (3); the first casing (1), the second casing (2), and the blade ring (3) being assembled by sandwiching the third coupling flange (3A) between the first coupling flange (1A) and the second coupling flange (2A).

Description

technical field [0001] The present invention relates to rotary machines for steam turbines, gas turbines and the like. Background technique [0002] Generally, a casing for a steam turbine or a gas turbine is divided into two, namely, an upper casing and a lower casing in which a rotating shaft is incorporated, and these casings are connected to each other on a horizontal surface using bolts (see, for example, Japanese Unexamined Utility Model application, Publication No. S60-195908). [0003] Alternatively, in a so-called "can turbine" turbine, the housing is integrally formed as one piece, the rotating shaft portion is inserted from one end opening of the housing, and the end opening is provided on the inner circumference of the housing by fastening and An eye screw (screw ring) engaged by a threaded portion on the upper body is hermetically closed (see, for example, Japanese Unexamined Utility Model Application, Publication No. S59-213907). [0004] The above-described ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01D25/24F01D25/26
CPCF01D25/243F01D25/26F05D2260/30
Inventor 山下匠生井上肇博松尾尊昭
Owner MITSUBISHI HEAVY IND LTD