Retention system for the blades of a rotary machine

Fluid reaction surfaces (i.e. – impellers) – Specific working member mount – Blade received in well or slot

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F04D 2934

Patent

active

057137218

ABSTRACT:
One form of a retention system includes a pair of aft segments of 180.degree. in length disposed in annular grooves about a compressor spool, the segments having radial projections against which the aft end faces of the base portions of rotor blades abut. The blade base portions are shaped and are received in complementary-shaped slots of the spool. The forward retention system includes a plurality of arcuate segments approximately 30.degree. in length disposed in grooves adjacent the forward end faces of the blades. With the exception of the final pair of blades, the blade base portions thereof are located in the axial complementary slots in pairs, with each forward arcuate segment, except the final segment, being disposed in the groove at a circumferentially spaced location and displaced circumferentially to abut the forward end faces. The final arcuate segment is radially reduced and disposed in the remaining portion of the groove to lie flush with the spool. The base portions of the final blades are axially inserted over the final segments and the latter is displaced radially outwardly and pinned to abut the forward end faces of the final blade base portions. In another form, tabs project forwardly or rearwardly from the base portions of the blades. The tabs have holes in registry with corresponding holes in the blade slot for receiving pins thereby preventing axial movement of the blades relative to the spool.

REFERENCES:
patent: 4400137 (1983-08-01), Miller et al.
patent: 4685863 (1987-08-01), McLean
patent: 5067877 (1991-11-01), Youssef
patent: 5350279 (1994-09-01), Prentice et al.

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