F - Mech Eng,Light,Heat,Weapons – 01 – D
Patent
F - Mech Eng,Light,Heat,Weapons
01
D
F01D 11/00 (2006.01) F01D 5/06 (2006.01) F01D 25/00 (2006.01) F16J 15/08 (2006.01)
Patent
CA 2246856
Seal device between fastening bolt and bolthole in gas turbine disc reduces cooling steam leaking from gap between the fastening bolt and the bolthole. In the gas turbine disc 31 carrying moving blades, fastening bolt 33 for fixing the disc 31 passes through in the bolthole 32. On low pressure side of the disc 31, bolthole diameter enlarged portion 39 having larger diameter than that d2 of the bolthole 32 is provided. Fastening bolt 33 is provided with shaft diameter enlarged portion 33a. Seal piece 1 is fitted at its one end around the shaft diameter enlarged portion 33a and is engaged at the other end with stepped portion of the bolthole diameter enlarged portion 39. In operation of gas turbine, the bolt 33 is biased outwardly by 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 R1 and R2 to maintain close contactability and steam 43 is prevented from leaking from high pressure side to low pressure part 38 and sealing ability is maintained. -17-
Chikami Rintaro
Hirokawa Kazuharu
Mitsubishi Heavy Industries Ltd.
Riches Mckenzie & Herbert Llp
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