US3867060A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Shroud assembly
Assignee: General Electric Co
•
Filing: 1973-09-27
•
Granted: 1975-02-18
•
Expires: 1993-09-27
Abstract
Abstract In a turbomachine, axial flow leakage of motive fluid between rotor blade tips and the inner circumference of the outer casing is sometimes prevented by utilizing an overlapping (labyrinth) seal and shroud assembly between the blade tips and the outer casing. Removal and assembly of the overlapping shroud seal in an annular, non-split outer casing is greatly facilitated by providing a plurality of shroud segments about the blade tip periphery and a radially outer clearance gap between the shroud segments and the outer casing whereby each shroud segment may be moved radially to unlap the seal and permit axial removal of the seal without disturbing rotor elements.
Inventors
- 👤 Thomas R Huber
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 19:33
CPC Classifications
F; F01; F01D; F01D11/00; F01D11/08
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
173 words
In a turbomachine, including a rotor axially disposed within a unitary outer casing, said rotor formed with a plurality of radially extending rotor blades, each blade having at least one radially extending seal tooth; and, said outer casing being formed with an open end annular recess circumferentially adjacent said rotor blades seal teeth; a shroud assembly comprising: a plurality of shroud segments disposed in said open end annular recess; at least one shroud seal tooth radially dependent from each shroud segment and overlapping a blade seal tooth in the axial direction to form an axial seal therewith; and, a clearance defined between a radially outer surface of each shroud segment and a radially inner surface of said outer casing whereby each shroud segment may be moved radially outward to unlap respective blade and shroud teeth prior to axial removal from the outer casing; an annular stop formed on said outer casing extending axially into said annular recess; and, a recess formed in each shroud segment for engaging a portion of said annular stop.
Claim 2
Dependent Claim
173 words
In a turbomachine, including a rotor axially disposed within a unitary outer casing, said rotor formed with a plurality of radially extending rotor blades, each blade having at least one radially extending seal tooth; and, said outer casing being formed with an open end annular recess circumferentially adjacent said rotor blades seal teeth; a shroud assembly comprising: a plurality of shroud segments disposed in said open end annular recess; at least one shroud seal tooth radially dependent from each shroud segment and overlapping a blade seal tooth in the axial direction to form an axial seal therewith; and, a clearance defined between a radially outer surface of each shroud segment and a radially inner surface of said outer casing whereby each shroud segment may be moved radially outward to unlap respective blade and shroud teeth prior to axial removal from the outer casing; an annular stop formed on said outer casing extending axially into said annular recess; and, a recess formed in each shroud segment for engaging a portion of said annular stop.
Claim 3
Dependent Claim
40 words
The shroud assembly recited in claim 1 wherein said recess formed in the shroud segment is elongated in the radial direction to allow radial positioning of the shroud segment when the shroud segment recess is proximate to the annular stop.
Claim 4
Dependent Claim
172 words
In a turbomachine a rotor axially disposed within an annular, non-split outer casing, said rotor formed with a plurality of radially extending rotor blades, each blade having radially extending seal teeth, and, said outer casing having an open end annular recess circumferentially adjacent said rotor blade seal teeth; a shroud assembly comprising: a plurality of shroud segments disposed in said open end annular recess; each shroud segment including a plurality of radially depending shroud seal teeth which overlap said radially extending blade seal teeth in the axial direction forming an axial labyrinth seal therewith; a clearance defined between a radially outer surface of each shroud segment and a radially inner surface of said outer casing; a spacer plate removably positioned in said clearance between each shroud segment and the outer casing; an annular stop formed on said outer casing extending axially into said annular recess; a recess formed in each shroud segment for engaging a portion of said annular stop; and, fastening means for attaching each shroud segment to the outer casing.
Claim 5
Dependent Claim
172 words
In a turbomachine a rotor axially disposed within an annular, non-split outer casing, said rotor formed with a plurality of radially extending rotor blades, each blade having radially extending seal teeth, and, said outer casing having an open end annular recess circumferentially adjacent said rotor blade seal teeth; a shroud assembly comprising: a plurality of shroud segments disposed in said open end annular recess; each shroud segment including a plurality of radially depending shroud seal teeth which overlap said radially extending blade seal teeth in the axial direction forming an axial labyrinth seal therewith; a clearance defined between a radially outer surface of each shroud segment and a radially inner surface of said outer casing; a spacer plate removably positioned in said clearance between each shroud segment and the outer casing; an annular stop formed on said outer casing extending axially into said annular recess; a recess formed in each shroud segment for engaging a portion of said annular stop; and, fastening means for attaching each shroud segment to the outer casing.
References Cited (Backward Citations)
US2416268A
Cited
US2956733A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-02-17 | 1978-08-19 | 1979-02-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-17 | 1982-08-19 | 1983-02-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-17 | 1986-08-19 | 1987-02-18 | $7700.00 | Window Closed / Lapsed |