US3861822A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Duct with vanes having selectively variable pitch
Assignee: General Electric Co
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Filing: 1974-02-27
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Granted: 1975-01-21
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Expires: 1994-02-27
Abstract
Abstract A gas turbine has a plurality of variable pitch inlet guide vanes. Each inlet guide vane has a vane lever arm for varying the pitch of the vanes in response to arcuate movement of the vane lever arms. Sector actuation segments interconnect adjacent vane lever arms so that circumferential movement of a sector actuation segment causes arcuate movement of the interconnected vane lever arms. Actuation means cooperates with the sector actuation segments and an actuation ring to selectively move the sector actuation segments circumferentially with respect to the actuation ring. The vanes, then, can be varied in pitch in unison or in individual sectors.
Inventors
- 👤 Robert P Wanger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 12:54
CPC Classifications
F; F01; F01D; F01D17/00; F01D17/10; F01D17/12; F01D17/14; F01D17/16; F01D17/162; F04; F04D; F04D29/00; F04D29/40; F04D29/52; F04D29/54; F04D29/56; F04D29/563
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
162 words
A duct of the type having an annular flow passage defined interiorly thereof, the duct comprisIng: a. an actuation ring mounted for circumferential movement relative to said duct; b. a plurality of variable pitch vanes disposed in said annular flow passage wherein each said vane includes a vane lever arm for varying the pitch of said vane in response to arcuate movement of said vane lever arm; c. a plurality of sector actuation segments wherein each said segment is pivotably mounted to predetermined numbers of said vane lever arms for moving said vane lever arms arcuately in response to circumferential movement of said sector actuation segment; and d. a plurality of actuation means corresponding in number to said plurality of sector actuation segments wherein each said actuation means cooperates with said actuation ring and said corresponding sector actuation segment for moving said corresponding sector actuation segment circumferentially relative to said actuation ring whereby the pitch of said vanes may be selectively varied.
Claim 2
Dependent Claim
162 words
A duct of the type having an annular flow passage defined interiorly thereof, the duct comprisIng: a. an actuation ring mounted for circumferential movement relative to said duct; b. a plurality of variable pitch vanes disposed in said annular flow passage wherein each said vane includes a vane lever arm for varying the pitch of said vane in response to arcuate movement of said vane lever arm; c. a plurality of sector actuation segments wherein each said segment is pivotably mounted to predetermined numbers of said vane lever arms for moving said vane lever arms arcuately in response to circumferential movement of said sector actuation segment; and d. a plurality of actuation means corresponding in number to said plurality of sector actuation segments wherein each said actuation means cooperates with said actuation ring and said corresponding sector actuation segment for moving said corresponding sector actuation segment circumferentially relative to said actuation ring whereby the pitch of said vanes may be selectively varied.
Claim 3
Dependent Claim
32 words
The duct recited in claim 1 wherein each said sector actuation segment includes a segment lever arm for moving said segment circumferentially in response to arcuate movement of said segment lever arm.
Claim 4
Dependent Claim
26 words
The duct recited in claim 2 wherein each said actuation means comprises a linear hydraulic actuator having a cylinder and a piston movable in said cylinder.
Claim 5
Dependent Claim
28 words
The duct recited in claim 3 wherein said cylinder is pivotably mounted to said actuation ring and said piston is pivotably mounted to said corresponding segment lever arm.
Claim 6
Dependent Claim
18 words
The duct recited in claim 1 wherein said vane lever arms comprising each said predetermined number are contiguous.
Claim 7
Dependent Claim
46 words
The duct recited in claim 5 wherein said plurality of vanes is 18 in number, equally spaced with respect to the circumference of said duct, said plurality of sector actuation segments is six in number, and each said predetermined number of vane lever arms is three.
Claim 8
Dependent Claim
13 words
The duct recited in claim 1 wherein said actuation ring circumscribes said duct.
Claim 9
Dependent Claim
22 words
The duct recited in claim 7 further comprising a plurality of actuation ring arms for mounting said actuation ring to said duct.
Claim 10
Dependent Claim
38 words
The duct recited in claim 1 in combination with a gas turbine of the type having a compressor and inlet guide vanes for directing flow to the compressor, wherein said variable pitch vanes comprise said inlet guide vanes.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-01-20 | 1978-07-22 | 1979-01-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-01-20 | 1982-07-22 | 1983-01-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-01-20 | 1986-07-22 | 1987-01-21 | $7700.00 | Window Closed / Lapsed |