Blade retention feature for saddle fir tree root blades of turbo

Details Blade retention feature for saddle fir tree root blades of turbo Blade retention feature for saddle fir tree root blades of turbo

1986-06-03

1988-11-01

Powell, Jr., Everette A.

Fluid reaction surfaces (i.e., impellers)

Specific working member mount

Blade straddles carrier

416217, 291568R, 29433, F01D 532

Patent

active

047815329

ABSTRACT:
In the case of saddle-type rotor blades of axial-flow turbomachines, the locking blade (6a), without its root part engaging in the fir trees (2) on the radially outer part of the rotor disk (1), is located under a large prestress between its neighboring blades (6b, 6c). It is fastened in the root part by means of axial pins (7). The blade root (4') of the locking blade (6a) is dimensioned more narrowly in the region of its fir trees (2') in its axial extension than that (4) of the neighboring blades (6b, 6c). By this means, a removal recess (10) is produced on both the inlet and outlet sides, in each of which a compression jack (11) can be introduced for pressing apart the neighboring blades (6b, 6c). The locking blade, relieved of loads in this manner, can be removed without being destroyed.

REFERENCES:
patent: 1279800 (1918-09-01), Warriner
patent: 1415266 (1922-05-01), Rice
patent: 2036083 (1936-03-01), Robinson
patent: 2103905 (1937-12-01), Hillner
patent: 2157827 (1939-05-01), Kliemann
patent: 2199243 (1940-04-01), Mortimer
patent: 2221685 (1940-11-01), Smith
patent: 2315616 (1943-04-01), Hall
patent: 2844355 (1958-07-01), Rankin
patent: 3826592 (1974-07-01), Raboin

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