US3768924A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Boltless blade and seal retainer
Assignee: General Electric Co
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Filing: 1971-12-06
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Granted: 1973-10-30
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Expires: 1991-12-06
Abstract
Abstract A boltless blade retainer which provides a cooling air chamber around the dovetail slots of a turbomachinery rotor is disclosed to include a continuous annular ring which has a portion extending radially outwardly therefrom to radially position the rotor blades within the dovetail slots and to preclude axial movement of the rotor blades within the dovetail slots. The blade retainer further includes a plurality of tabs which fit between fingers which extend from a face of the rotor disc near the rim thereof. The tabs and fingers hook together in an interlocking manner which prevents relative rotation of the blade retainer and the disc. After the retainer is positioned on the disc, a split retaining ring is installed under the hook-shaped disc fingers thus securing the blade retainer to the disc. A rabbet is provided near the rim of the rotor disc to support the retainer in the radial direction.
Inventors
- 👤 R Andersen
- 👤 R Corsmeier
- 👤 J Savage
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:53
CPC Classifications
F; F01; F01D; F01D5/00; F01D5/30; F01D5/3007; F01D5/3015; F01D5/02; F01D5/08; F01D5/081; Y; Y02; Y02T; Y02T50/00; Y02T50/60
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
107 words
A boltless blade retainer for a turbomachinery rotor which includes a rotor disc having a plurality of blade dovetail slots therein and a plurality of rotor blades positioned within the slots, said blade retainer comprising: a continuous annular ring, means for securing said ring to a face of the rotor disc, a leg extending radially outwardly from said ring, said leg including means for radially positioning the rotor blades within the dovetail slots and means for preventing axial movement of the rotor blades within the slots, and said leg defining a cooling air chamber around at least a portion of the dovetail slots of the rotor disc.
Claim 2
Dependent Claim
107 words
A boltless blade retainer for a turbomachinery rotor which includes a rotor disc having a plurality of blade dovetail slots therein and a plurality of rotor blades positioned within the slots, said blade retainer comprising: a continuous annular ring, means for securing said ring to a face of the rotor disc, a leg extending radially outwardly from said ring, said leg including means for radially positioning the rotor blades within the dovetail slots and means for preventing axial movement of the rotor blades within the slots, and said leg defining a cooling air chamber around at least a portion of the dovetail slots of the rotor disc.
Claim 3
Dependent Claim
26 words
A boltless blade retainer as recited in claim 1 wherein said ring securing means include a plurality of tabs which extend radially inwardly from said ring.
Claim 4
Dependent Claim
24 words
A boltless blade retainer as recited in claim 2 wherein said leg further includes means for passing cooling air to said cooling air chamber.
Claim 5
Dependent Claim
48 words
A boltless blade retainer as recited in claim 3 in combination with a rotor disc, said rotor disc including a plurality of hook-shaped fingers formed integrally therewith and extending from the face of said disc, said fingers being spaced so as to receive said blade retainer tabs therebetween.
Claim 6
Dependent Claim
51 words
The combination recited in claim 4 wherein said hook-shaped fingers include a first portion extending axially from the face of said disc and a second portion extending radially inwardly from said first portion, said combination furTher including a locking strip positioned between said tabs and said second portion of said fingers.
Claim 7
Dependent Claim
33 words
The combination recited in claim 5 wherein said rotor disc includes a rabbet located radially outwardly of said hook-shaped fingers, and said blade retainer ring is positioned between said rabbet and said fingers.
Claim 8
Dependent Claim
71 words
A combination as recited in claim 6 further including a plurality of rotor blades positioned within the dovetail slots, said blades including platforms forming the inner bounds of a gas flow passage, said blade retainers being further characterized in that said means for radially positioning said blades comprise an enlarged head portion at the top of said blade retainer leg, and said head portion lies beneath and supports said blade platforms.
Claim 9
Dependent Claim
114 words
A turbomachinery rotor which includes at least one rotor disc having a plurality of blade dovetail slots located in the rim thereof, a rotor blade positioned within each of said blade dovetail slots, and a boltless blade retainer, said blade retainer comprising: a continuous annular ring, means for securing said ring to a face of said rotor disc, a leg extending radially outwardly from said ring, said leg including means for radially positioning said rotor blades within said dovetail slots and means for preventing axial movement of said rotor blades within said slots, and said leg defining a cooling air chamber around at least a portion of said dovetail slots of said rotor disc.
Claim 10
Dependent Claim
114 words
A turbomachinery rotor which includes at least one rotor disc having a plurality of blade dovetail slots located in the rim thereof, a rotor blade positioned within each of said blade dovetail slots, and a boltless blade retainer, said blade retainer comprising: a continuous annular ring, means for securing said ring to a face of said rotor disc, a leg extending radially outwardly from said ring, said leg including means for radially positioning said rotor blades within said dovetail slots and means for preventing axial movement of said rotor blades within said slots, and said leg defining a cooling air chamber around at least a portion of said dovetail slots of said rotor disc.
Claim 11
Dependent Claim
46 words
A turbomachinery rotor as recited in claim 8 wherein said blade retainer is further characterized in that said means for securing said blade retainer ring to a face of said rotor disc includes a plurality of tabs which extend radially inwardly from said blade retainer ring.
Claim 12
Dependent Claim
25 words
A turbomachinery rotor as recited in claim 9 wherein said blade retainer leg further includes means for passing cooling air to said cooling air chamber.
Claim 13
Dependent Claim
40 words
A turbomachinery rotor as recited in claim 10 wherein said rotor disc includes a plurality of hook-shaped fingers formed integrally therewith and extending from a face thereof, said fingers being spaced so as to receive said blade retainer tabs therebetween.
Claim 14
Dependent Claim
42 words
A turbomachinery rotor as recited in claim 11 including a second blade retainer, said first blade retainer being secured to a first face of said rotor disc and said second blade retainer being secured to the opposite face of said rotor disc.
Claim 15
Dependent Claim
86 words
A turbomachinery rotor as recited in claim 12 wherein said second blade retainer comprises: a continuous annular ring, means for securing said ring to a face of the rotor disc, a leg extending radially outwardly from said ring, said leg including means for radially positioning the rotor blades within the dovetail slots and means for preventing axial movement of the rotor blades within the slots, and said leg defining a cooling air chamber around at least a portion of the dovetail slots of the rotor disc.
Claim 16
Dependent Claim
59 words
A turbomachinery rotor as recited in claim 12 including a first locking strip positioned between said blade retainer tabs and said hooked-shaped fingers of said first face, and a second locking strip positioned between said blade retainer tabs of said second blade retainer and hook-shaped fingers formed integrally with and extending from said opposite face of said rotor disc.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-10-29 | 1977-04-30 | 1977-10-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-29 | 1981-04-30 | 1981-10-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-29 | 1985-04-30 | 1985-10-30 | $7700.00 | Window Closed / Lapsed |