Keying for shrunk-on turbine wheels

Details Keying for shrunk-on turbine wheels Keying for shrunk-on turbine wheels

1981-07-06

1984-10-16

Coe, Philip R.

Fluid reaction surfaces (i.e., impellers)

Multiple axially spaced working members

416201R, 416244A, F01D 530

Patent

active

044772270

ABSTRACT:
A turbine rotor structure is disclosed in which shrink-fitted turbine wheels are keyed to the turbine shaft to prevent rotation of the wheels with respect to the shaft in the event of any loosening of the shrink fit. In a preferred arrangement, the rotatable shaft of the turbine is provided with an integral flange, near one end, having two diametrically opposed, notched keyways formed at peripheral locations thereon. Each wheel of the set of wheels used to carry the turbine buckets includes an integral, central hub which extends axially to both sides of the wheel. Further, each hub has pairs of complementary keys and keyways whose members are axially opposite each other at peripheral locations on the wheel hubs. Thus, the key of the first wheel on the shaft mates with the keyway of the integral flange of the shaft and subsequently added wheels mate with each other. The high levels of mechanical stress found with previously used keying means located at the wheel bore are avoided and potential problems of steam condensation leading to water erosion and stress corrosion cracking in the keying means are eliminated.

REFERENCES:
patent: 740945 (1903-10-01), Taplin
patent: 917206 (1909-04-01), Watts
patent: 1107238 (1914-08-01), Kieser
patent: 2660399 (1953-11-01), Robinson et al.
patent: 2769611 (1956-11-01), Schwarzkopf
patent: 4029437 (1977-06-01), Aubrey
patent: 4123199 (1978-10-01), Shimizu
Hodge et al., The Institution of Mechanical Engineers, Proceedings 1979, vol. 193, No. 11.

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