Rotary kinetic fluid motors or pumps – With passage in blade – vane – shaft or rotary distributor...
Patent
1997-05-22
1998-10-13
Kwon, John T.
Rotary kinetic fluid motors or pumps
With passage in blade, vane, shaft or rotary distributor...
416 95, F04D 2938
Patent
active
058203362
ABSTRACT:
Because a gas turbine stationary blade is exposed to a high speed, high temperature gas flow, its service life is shortened due to thermal stress and high temperatures. The present invention provides a gas turbine stationary blade unit with reduced thermal stress, a high cooling effect and an elongated service life. A blade (103) is formed by a thin plate panel (110) formed with a reinforcing element (105) disposed on an inner side or cooling side of the blade (103). Thereby, thermal stress occurring at the blade (103) is reduced as well as the fluid force acting on the blade (103) by an operating gas (G) is transmitted to a stationary blade holding portion (104) via the reinforcing element (105). Thus, the thickness or rigidity of a connection portion of the blade (103) and an outer shroud (101) need not be increased, and a thermal deformation and an unhomogenous distribution of thermal stress can be avoided. Further, in addition to the thinning of the blade, an overall cooling effect is enhanced by cooling the reinforcing element (105), thereby preventing high temperatures and extending the service life of the turbine stationary blade.
REFERENCES:
patent: 3240468 (1966-03-01), Watts et al.
patent: 4118146 (1978-10-01), Dierberger
patent: 4835958 (1989-06-01), Rice
patent: 5531568 (1996-07-01), Broadhead
patent: 5634766 (1997-06-01), Cunha et al.
Kwon John T.
Mitsubishi Heavy Industries Ltd.
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