US4114059A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Grooved visco seal for stationary discharge chamber of water-cooled turbine generator
Assignee: Westinghouse Electric Corp
•
Filing: 1976-09-03
•
Granted: 1978-09-12
•
Expires: 1996-09-03
Abstract
Abstract A discharge chamber seal arrangement for a water cooled turbine generator rotor. The discharge chamber seal arrangement comprises a gland seal operable during high speed operation of the rotor and a contact seal operable during low rotor speed and at standstill. Helical grooves located on the inside diameter of the gland seal develops an axial pressure gradient in the fluid annulus surrounding the shaft to reduce the leakage flow at speed through the gland seal. The helical grooves apply a pumping action which opposes the leakage flow.
Inventors
- 👤 Jacques E. Albaric
- 👤 Little P. Curtis
- 👤 George F. Dailey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:47
CPC Classifications
F; F16; F16J; F16J15/00; F16J15/16; F16J15/164; F16J15/002; F16J15/008; F16J15/40; F16J15/406; H; H02; H02K; H02K5/00; H02K5/04; H02K5/12; H02K5/124; Y; Y10; Y10S; Y10S277/00; Y10S277/907; Y10S277/929; Y10S277/93
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
266 words
In a dynamoelectric machine of the type including a rotor and a shaft extending from said rotor, said shaft having a passage for circulation of a liquid cooling fluid therethrough, said passage in said shaft including a discharge passage for discharging said liquid coolant from said shaft and into said discharge chamber, and further including sealing means for sealing said discharge chamber, said sealing means including a first seal device for sealing said discharge chamber during rotation of said shaft in a first speed range corresponding generally from standstill through a first predetermined speed of rotation of said shaft, said first seal device being a contact seal, and a second seal device for sealing said discharge chamber during rotation of said shaft in a second speed range corresponding generally to a speed substantially equal to said first predetermined speed of rotation through a second predetermined speed of rotation greater than said first predetermined speed of rotation, said second seal device comprising a gland seal having an annular body portion disposed about said shaft, said annular body portion being spaced apart from said shaft to define an annular passage, the surface of said annular body portion confronting said shaft having a land portion extending in helical relation with respect to the axis of said shaft, said land portion defining a groove which extends in helical relation with respect to the axis of said shaft and which is in fluid communication with said annular passage, and means for introducing a sealing liquid into said annular passage between the body portion of said second seal device and said shaft.
Claim 2
Dependent Claim
266 words
In a dynamoelectric machine of the type including a rotor and a shaft extending from said rotor, said shaft having a passage for circulation of a liquid cooling fluid therethrough, said passage in said shaft including a discharge passage for discharging said liquid coolant from said shaft and into said discharge chamber, and further including sealing means for sealing said discharge chamber, said sealing means including a first seal device for sealing said discharge chamber during rotation of said shaft in a first speed range corresponding generally from standstill through a first predetermined speed of rotation of said shaft, said first seal device being a contact seal, and a second seal device for sealing said discharge chamber during rotation of said shaft in a second speed range corresponding generally to a speed substantially equal to said first predetermined speed of rotation through a second predetermined speed of rotation greater than said first predetermined speed of rotation, said second seal device comprising a gland seal having an annular body portion disposed about said shaft, said annular body portion being spaced apart from said shaft to define an annular passage, the surface of said annular body portion confronting said shaft having a land portion extending in helical relation with respect to the axis of said shaft, said land portion defining a groove which extends in helical relation with respect to the axis of said shaft and which is in fluid communication with said annular passage, and means for introducing a sealing liquid into said annular passage between the body portion of said second seal device and said shaft.
Claim 3
Dependent Claim
25 words
The combination as defined in claim 1 wherein said first speed range is substantially 0-1800 RPM and said second speed range is substantially 1800-3600 RPM.
References Cited (Backward Citations)
US3963247A
Cited
US3733501A
Cited
US3968388A
Cited
US3831046A
Cited
US4010960A
Cited
US4018059A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-09-11 | 1982-03-13 | 1982-09-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-09-11 | 1986-03-13 | 1986-09-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-09-11 | 1990-03-13 | 1990-09-12 | $7700.00 | Window Closed / Lapsed |