Seal device between fastening bolt and bolthole in gas turbine d

Fluid reaction surfaces (i.e. – impellers) – With heating – cooling or thermal insulation means – Changing state mass within or fluid flow through working...

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Details

416198A, 416201R, 415114, 415115, F01D 506, F01D 518

Patent

active

060957514

ABSTRACT:
A seal device between a fastening bolt and a bolthole in a gas turbine disc reduces cooling steam leaking from a gap between the fastening bolt and the bolthole. A gas turbine disc 31 carrying moving blades, a fastening bolt 33 for fixing the disc 31 passes through a bolthole 32. On a low pressure side of the disc 31, a bolthole diameter enlarged portion 39 having a larger diameter than that of the bolthole 32 is provided. Fastening bolt 33 is provided with a shaft diameter enlarged portion 33a. Seal piece 1 is fitted at one end around the shaft diameter enlarged portion 33a and is engaged at the other end with a stepped portion of the bolthole diameter enlarged portion 39. In operation of the gas turbine, the bolt 33 is biased outwardly be centrifugal force, and the gap between the bolt 33 and the bolthole 32 deforms. Nevertheless, the seal piece 1, having flexibility, deforms at bent portions R.sub.1 and R.sub.2 to maintain close contact and steam 43 is prevented from leaking from the high pressure side to the low pressure part 38, and the sealing ability is maintained.

REFERENCES:
patent: 2317092 (1943-04-01), Allen
patent: 4184797 (1980-01-01), Anderson et al.
patent: 4453889 (1984-06-01), Sakata et al.
patent: 4880354 (1989-11-01), Teranishi et al.
patent: 5758487 (1998-06-01), Salt et al.
patent: 5795130 (1998-08-01), Suenaga et al.

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