AXIAL FLOW FLUID MACHINE

WIPO Patent Application WO/2014/010052

A1

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).

NISHIJIMA NORIYO (JP)
ENDO AKIRA (JP)
KOBAYASHI KATSUTOSHI (JP)
YAMAGUCHI KAZUYUKI (JP)

PCT/JP2012/067748

January 16, 2014

July 11, 2012

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HITACHI LTD (JP)
NISHIJIMA NORIYO (JP)
ENDO AKIRA (JP)
KOBAYASHI KATSUTOSHI (JP)
YAMAGUCHI KAZUYUKI (JP)

F01D11/00

JP2009243287A	2009-10-22
JP2009047043A	2009-03-05
JPS5029905A	1975-03-26
JPS6081202U	1985-06-05
JPS61223201A	1986-10-03
JP2006104952A	2006-04-20

See also references of EP 2878771A4

KASUGA Yuzuru (JP)
Kasuga 讓 (JP)

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