Composite tip shroud ring

Details Composite tip shroud ring Composite tip shroud ring

2008-07-01

2008-07-01

Edgar, Richard A. (Department: 3745)

Fluid reaction surfaces (i.e., impellers)

Rotor having flow confining or deflecting web, shroud or...

Apertured or foraminous web or shroud

C416S190000, C416S228000

Reexamination Certificate

active

11185339

ABSTRACT:
A gas turbine engine includes a tip shroud ring rotatably supported on a last stage blade assembly in a turbine. The tip shroud ring is formed entirely of a fiber reinforced ceramic matrix composite material to provide a very light weight tip shroud ring, but also a very strong ring. The blades include pins extending from the tips, and the tip shroud ring includes holes in which the pins slide. Thus, the tip shroud ring is completely supported by the blade tip pins, and the centrifugal force developed by the rotation of the tip shroud ring does not add to the tensile force developed along the blades. Thus, the maximum rotational speed of the turbine rotor as defined by An2can be increased. Also, because the blade tips are secured to the tip shroud ring in a circumferential direction, the tip shroud ring acts to dampen the bladed turbine by allowing only the middle of the blade to vibrate.

REFERENCES:
patent: 4017209 (1977-04-01), Bodman
patent: 4232996 (1980-11-01), Stoffer
patent: 5037273 (1991-08-01), Krueger et al.
patent: 5253978 (1993-10-01), Fraser
patent: 6402474 (2002-06-01), Okuno

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