US3623736A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sealing device
Assignee: Rolls Royce PLC
•
Filing: 1969-09-16
•
Granted: 1971-11-30
•
Expires: 1989-09-16
Abstract
Abstract A sealing device mounted for axial movement on a stationary portion of a gas turbine engine and arranged to seal against the blade shroud of the high-pressure turbine of the engine. The sealing device is annular in form and has two lips defining an annular channel and a number of radial lands extending between the lips thereby defining a plurality of equispaced recesses. In operation the recesses in combination with the blade shroud form a number of chambers which are subjected to a variable pressure, the chambers being in communication with a source of highpressure gas. If the clearance between the sealing device and the blade shroud decreases the pressure in the chambers increases and vice versa, the resultant pressure on the sealing device acting to maintain the clearance at a substantially constant value.
Inventors
- 👤 James A Petrie
- 👤 Willie Williamson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:56
CPC Classifications
F; F16; F16J; F16J15/00; F16J15/46; F16J15/48; F01; F01D; F01D11/00; F01D11/02; F01D11/025
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
198 words
A sealing device between two relatively rotatable structures including a seal part located between relatively high-pressure zone and a relatively low pressure zone, the seal part being sealingly mounted on the first one of said structures and capable of axial movement relative to said structures, the seal part in combination with the said one of said structures forming at least one chamber subjected to a variable pressure, the chamber being in communication with the high-pressure zone and the arrangement being such that as the clearance between the seal part and the second of said structures decreases the pressure in the chamber rises and vice versa, the resultant pressure acting on the seal part varying as the clearance varies to maintain the clearance at a substantially constant value, and the seal part and the first of said structures in combination form a piston and cylinder arrangement, the cylinder being in communication both with a supply of relatively high-pressure air and the clearance between the sealing device and the second of said structures, a supply of relatively medium pressure air acting on the seal part in opposition to the force exerted on the seal part by the relatively high-pressure air.
Claim 2
Dependent Claim
198 words
A sealing device between two relatively rotatable structures including a seal part located between relatively high-pressure zone and a relatively low pressure zone, the seal part being sealingly mounted on the first one of said structures and capable of axial movement relative to said structures, the seal part in combination with the said one of said structures forming at least one chamber subjected to a variable pressure, the chamber being in communication with the high-pressure zone and the arrangement being such that as the clearance between the seal part and the second of said structures decreases the pressure in the chamber rises and vice versa, the resultant pressure acting on the seal part varying as the clearance varies to maintain the clearance at a substantially constant value, and the seal part and the first of said structures in combination form a piston and cylinder arrangement, the cylinder being in communication both with a supply of relatively high-pressure air and the clearance between the sealing device and the second of said structures, a supply of relatively medium pressure air acting on the seal part in opposition to the force exerted on the seal part by the relatively high-pressure air.
Claim 3
Dependent Claim
26 words
A sealing device according to claim 1 in which the medium pressure air acts on an annular rim adjacent the rear face of the seal part.
Claim 4
Dependent Claim
22 words
A sealing device according to claim 1 in which the medium pressure air acts on the forward face of the seal part.
Claim 5
Dependent Claim
49 words
A sealing device according to claim 1 in which the seal part is connected to a piston and to the first structure by a link system so that the seal part can swing by means of the link system about a fixed point on the first of said structures.
Claim 6
Dependent Claim
43 words
A sealing device according to claim 4 in which the link system comprises a first link pivotally connecting the piston and the seal part and a second link pivotally connecting the seal part to a fixed point on the first of said structures.
References Cited (Backward Citations)
US3347553A
Cited
US3501245A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-11-29 | 1975-05-31 | 1975-11-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-29 | 1979-05-31 | 1979-11-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-29 | 1983-05-31 | 1983-11-30 | $7700.00 | Window Closed / Lapsed |