Fluid reaction surfaces (i.e. – impellers) – Specific working member mount – Blade received by continuous circumferential channel
Reissue Patent
1998-01-26
2002-11-05
Kwon, John (Department: 3754)
Fluid reaction surfaces (i.e., impellers)
Specific working member mount
Blade received by continuous circumferential channel
C416S191000, C416S22000A, C416S500000
Reissue Patent
active
RE037900
ABSTRACT:
BACKGROUND OF THE INVENTION
This invention relates to rotatable turbine blades and more particularly to a group of blades held on the rotor with pins. Rotatable blades with pin roots have been utilized in turbines for many years. The original pinned root blade groups were welded together. Later, when materials changed so that welding could no longer be utilized, electric discharge machining was utilized to manufacture the blade groups from a block of metal. The blade groups described hereinafter have improved vibratory and steady-state stress characteristics.
SUMMARY OF THE INVENTION
In general, a blade group which attaches to a disc disposed on the shaft of an axial flow turbine, when made in accordance with this invention, comprises a platform portion, multiple blade portions extending radially outwardly from the platform portion, and multiple root portions extending radially inwardly from the platform portion. The root portion comprises generally flat spaced-apart arcuate segments disposed normal to the axis of the shaft and the turbine rotor or disc has circumferential grooves which receive the root portion. Multiple pins extend axially through the root portions and the disc and the platform has a protrusion on one corner and a notch on the opposite corner so that the protrusion in one blade group fits the notch in adjacent blade group when a plurality of blade groups are disposed in a circular array on the rotor.
REFERENCES:
patent: 2220918 (1940-11-01), Smith
patent: 2326145 (1943-08-01), Kroon
patent: 2405146 (1946-08-01), Huber
patent: 2745352 (1956-05-01), Zeidler
patent: 3014695 (1961-12-01), Rankin et al.
patent: 3576377 (1971-04-01), Beanland et al.
patent: 4076455 (1978-02-01), Stargardter
patent: 4135849 (1979-01-01), Pigott
patent: 5100296 (1992-03-01), Partington et al.
patent: 482144 (1952-04-01), None
patent: 351142 (1956-08-01), None
patent: 684946 (1930-07-01), None
patent: 667979 (1952-03-01), None
Drawings; Westinghouse Electric Corporation; BLD PINNED SECT 2018-1 LH; Issue Date Jul. 5, 1977.
Eckert Seamens Cherin & Mellott, LLC
Kwon John
Siemens Westinghouse Power Corporation
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