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Axial flow fluid machine

A fluid machinery, axial flow technology, applied in the direction of mechanical equipment, engine components, machines/engines, etc., can solve problems such as uneven pressure distribution P, achieve the effect of suppressing unstable vibration and reducing unstable fluid force

Inactive Publication Date: 2015-04-15
MITSUBISHI HITACHIPOWER SYST LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, due to the above-mentioned variation in the width dimension H of the gap flow path 104 and the swirling flow, an uneven pressure distribution P is generated in the circumferential direction of the gap flow path 102 .

Method used

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Examples

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Embodiment Construction

[0028] Hereinafter, an embodiment in which the present invention is applied to a steam turbine will be described with reference to the drawings.

[0029] figure 1 It is a sectional view schematically showing a partial structure (block structure) of the steam turbine in the first embodiment of the present invention in the direction of the rotor axis. figure 2 yes figure 1 Partially enlarged cross-sectional view of part II in the middle shows the detailed structure of the concave part of the case.

[0030] In these figure 1 as well as figure 2Among them, a steam turbine includes a substantially cylindrical casing (stationary body) 1 and a rotor (rotary shaft) 2 rotatably provided in the casing 1 . The inner peripheral side of the casing 1 is provided with a row of stationary blades 3 (in detail, a plurality of stator blades arranged in the circumferential direction), and the outer peripheral side of the rotor 2 is provided with a row of moving blades 4 (in detail, arran...

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PUM

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Abstract

Provided is an axial flow fluid machine which makes it possible to effectively reduce unstable fluid force caused by leakage flow and makes it possible to suppress unstable vibration. A steam turbine comprises an annular cover (6) which is connected to the outer peripheral part of a rotating cascade (4), and an annular recess (12) which is provided on an inner peripheral surface (8) of a casing (1) and houses the cover (6). A clearance flow path (15) is formed between an outer peripheral surface (13) of the cover (6) and a bottom surface (14) of the recess (12), a clearance inlet flow path (18) is formed between an upstream side surface (16) of the cover (6) and an upstream side surface (17) of the recess (12), and a clearance outlet flow path (21) is formed between a downstream side surface (19) of the cover (6) and a downstream side surface (20) of the recess (12). A clearance inlet expansion flow path (22) is then provided between the clearance inlet flow path (18) and the clearance flow path (15), and the clearance inlet expansion flow path (22) is formed in such a way as to expand further towards the outer peripheral side than the bottom surface (14) of the recess (12) and further upstream in the axial direction of a rotor than the upstream side surface (17) of the recess (12).

Description

technical field [0001] The present invention relates to an axial-flow fluid machine such as an axial-flow turbine, and more particularly, to an axial-flow fluid machine having a shroud on the outer peripheral portion of a rotor blade row and a concave portion on an inner peripheral surface of a case housing the shroud. Background technique [0002] An axial flow turbine (specifically, such as a steam turbine, a gas turbine, etc.), which is one of axial flow machines, generally includes a casing, a rotor rotatably provided in the casing, and stator blades provided on the inner peripheral side of the casing. row, and a moving blade row disposed on the outer peripheral side of the rotor and disposed on the downstream side of the rotor axial direction relative to the stationary blade row. Furthermore, the working fluid (specifically, steam, gas, etc.) flows in the order of the stationary blade row and the moving blade row, and the internal energy of the working fluid is converte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01D11/00
CPCF01D11/08F01D11/02F05D2220/31F01D5/225F05D2220/30F05D2240/12F05D2240/24
Inventor 西岛规世远藤彰小林克年山口和幸
Owner MITSUBISHI HITACHIPOWER SYST LTD