US3831046A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sealing device for discharge chamber of liquid cooled rotors for dynamoelectric apparatus
Assignee: Westinghouse Electric Corp
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Filing: 1973-08-16
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Granted: 1974-08-20
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Expires: 1993-08-16
Abstract
Abstract A gland seal for the discharge passages of a liquid cooled rotor for a dynamoelectric apparatus. Coolant liquid is discharged into a stationary coolant collection chamber surrounding the rotor. The stationary coolant discharge chamber has a gaseous fluid therein. A gland seal ring encircles the rotor adjacent the discharge chamber and a first sealing liquid having a predetermined pressure is introduced into a clearance disposed between the seal ring and the rotor. A second sealing liquid having a pressure not exceeding the pressure of the first sealing liquid is introduced into the clearance between the seal ring and the rotor. The first sealing liquid minimizes leakage of the coolant liquid from the discharge chamber, and also prevents contamination of the coolant liquid by the second sealing liquid.
Inventors
- 👤 L Curtis
- 👤 S Ying
- 👤 G Dailey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 09:13
CPC Classifications
H; H02; H02K; H02K5/00; H02K5/04; H02K5/12; H02K5/124
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
330 words
A rotor for a dynamoelectric machine comprising: a body portion having windings thereon, said windings having openings for circulation of a liquid coolant therethrough; a shaft portion extending from said body portion, said shaft having passages for circulation of said liquid coolant through said shaft, said passages in said shaft including a discharge passage for discharging said liquid coolant therefrom; sealing means associated with said discharge passage, said sealing means comprising a stationary body member, said body member having a close clearance with said shaft, said body member having a first and a second axial side thereon, a liquid coolant discharge chamber disposed within said body member, said liquid coolant discharge chamber having a gaseous fluid therein; a first stationary seal ring encircling said shaft with a small clearance space adjacent said first axial side of said body member, said clearance space communicating with said liquid coolant discharge chamber; first conduit means for introducing a first sealing liquid into said clearance space between said first seal ring and said shaft, said first sealing liquid being maintained at a predetermined pressure; second conduit means for introducing a second sealing liquid into said clearance space between said first seal ring and Said shaft, said second sealing liquid being maintained at a pressure not exceeding the pressure of said first sealing liquid, said first sealing liquid being disposed in said clearance space between said first seal ring and said shaft intermediate said liquid coolant discharge chamber and said second sealing liquid; a first stationary chamber surrounding said shaft adjacent said first seal ring, said first stationary chamber communicating with said clearance space between said first seal ring and said shaft, said first stationary chamber receiving said first and said second sealing liquids expelled from said clearance space between said first seal ring and said shaft, said first stationary chamber being maintained at a predetermined pressure; first labyrinth seal means for sealing said first stationary chamber; and, means for draining said first stationary chamber.
Claim 2
Dependent Claim
330 words
A rotor for a dynamoelectric machine comprising: a body portion having windings thereon, said windings having openings for circulation of a liquid coolant therethrough; a shaft portion extending from said body portion, said shaft having passages for circulation of said liquid coolant through said shaft, said passages in said shaft including a discharge passage for discharging said liquid coolant therefrom; sealing means associated with said discharge passage, said sealing means comprising a stationary body member, said body member having a close clearance with said shaft, said body member having a first and a second axial side thereon, a liquid coolant discharge chamber disposed within said body member, said liquid coolant discharge chamber having a gaseous fluid therein; a first stationary seal ring encircling said shaft with a small clearance space adjacent said first axial side of said body member, said clearance space communicating with said liquid coolant discharge chamber; first conduit means for introducing a first sealing liquid into said clearance space between said first seal ring and said shaft, said first sealing liquid being maintained at a predetermined pressure; second conduit means for introducing a second sealing liquid into said clearance space between said first seal ring and Said shaft, said second sealing liquid being maintained at a pressure not exceeding the pressure of said first sealing liquid, said first sealing liquid being disposed in said clearance space between said first seal ring and said shaft intermediate said liquid coolant discharge chamber and said second sealing liquid; a first stationary chamber surrounding said shaft adjacent said first seal ring, said first stationary chamber communicating with said clearance space between said first seal ring and said shaft, said first stationary chamber receiving said first and said second sealing liquids expelled from said clearance space between said first seal ring and said shaft, said first stationary chamber being maintained at a predetermined pressure; first labyrinth seal means for sealing said first stationary chamber; and, means for draining said first stationary chamber.
Claim 3
Dependent Claim
38 words
The rotor of claim 1, further comprising a second stationary chamber surrounding said shaft adjacent said first stationary chamber, said second stationary chamber being maintained at a pressure greater than the pressure maintained in said first stationary chamber.
Claim 4
Dependent Claim
150 words
The rotor of claim 2, wherein said first seal ring is contained in a first annular chamber adjacent said liquid coolant discharge chamber, the radially outermost surface of said first seal ring defining an annular space within said first annular chamber, said first seal ring having a first opening extending therethrough, said first sealing liquid being introduced into said annular space by said first conduit means, said first sealing liquid passing through said first opening in said first seal ring into said clearance space between said first seal ring and said shaft; and, said first seal ring having a second opening extending therethrough, said second sealing liquid being introduced directly into said second opening in said first seal ring by said second conduit means, said second sealing liquid passing through said second opening in said first seal ring into said clearance space between said first seal ring and said shaft.
Claim 5
Dependent Claim
192 words
The rotor of claim 3, further comprising: a second stationary seal ring encircling said shaft with a small clearance space adjacent said second axial side of said body member, said clearance space communicating with said liquid coolant discharge chamber; third conduit means for introducing said first sealing liquid into said clearance space between said second seal ring and said shaft; fourth conduit means for introducing said second sealing liquid into said clearance space between said second seal ring and said shaft, said first sealing liquid being disposed in said clearance space between said second seal ring and said shaft intermediate between said liquid coolant discharge chamber and said second sealing liquid; a third stationary chamber surrounding said shaft adjacent said second seal ring, said third stationary chamber communicating with said clearance space between said second seal ring and said shaft, said third stationary chamber receiving said first and said second sealing liquids expelled from said clearance between said second seal ring and said shaft, said third stationary chamber being maintained at a predetermined pressure; second labyrinth seal means for sealing said third stationary chamber; and, means for draining said third stationary chamber.
Claim 6
Dependent Claim
38 words
The rotor of claim 4, further comprising a fourth stationary chamber surrounding said shaft adjacent said third stationary chamber, said fourth stationary chamber being maintained at a pressure greater than the pressure maintained in said third stationary chamber.
Claim 7
Dependent Claim
150 words
The rotor of claim 5, wherein said second seal ring is contained in a second annular chamber adjacent said liquid coolant discharge chamber, the radially outermost surface of said second seal ring defining an annular space within said second annular chamber, said second seal ring having a first opening extending therethrough, said first sealing liquid being introduced into said annular space by said third conduit means, said first sealing liquid passing through said first opening in said second seal ring into said clearance space between said second seal ring and said shaft; and, said second seal ring having a second opening extending therethrough, said second sealing liquid being introduced directly into said second opening in said second seal ring by said fourth conduit means, said second sealing liquid passing through said second opening in said second seal ring into said clearance space between said second seal ring and said shaft.
Claim 8
Dependent Claim
271 words
A shaft seal for preventing escape of a liquid along a rotating shaft, said seal comprising: a stationary body member, said body member having a close clearance with said shaft, said body member having a first and a second axial side thereon, a liquid discharge chamber disposed within said body member, said liquid discharge chamber having a gaseous fluid therein; a first stationary seal ring encircling said shaft with a small clearance space adjacent said first axial side of said body member, said clearance space communicating with said liquid discharge chamber; first conduit means for introducing a first sealing liquid into said clearance space between said first seal ring and said shaft, said first sealing liquid being maintained at a predetermined pressure; second conduit means for introducing a second sealing liquid into said clearance space between said first seal ring and said shaft, said second sealing liquid being maintained at a pressure not exceeding the pressure of said first sealing liquid, said first sealing liquid being disposed in said clearance space between said first seal ring and said shaft intermediate said liquid discharge chamber and said second sealing liquid; a first stationary chamber surrounding said shaft adjacent said first seal ring, said first stationary chamber communicating with said clearance space between said first seal ring and said shaft, said first stationary chamber receiving said first and said second sealing liquids expelled from said clearance space between said first seal ring and said shaft, said first stationary chamber being maintained at a predetermined pressure; first labyrinth seal means for sealing said first stationary chamber; and, means for draining said first stationary chamber.
Claim 9
Dependent Claim
271 words
A shaft seal for preventing escape of a liquid along a rotating shaft, said seal comprising: a stationary body member, said body member having a close clearance with said shaft, said body member having a first and a second axial side thereon, a liquid discharge chamber disposed within said body member, said liquid discharge chamber having a gaseous fluid therein; a first stationary seal ring encircling said shaft with a small clearance space adjacent said first axial side of said body member, said clearance space communicating with said liquid discharge chamber; first conduit means for introducing a first sealing liquid into said clearance space between said first seal ring and said shaft, said first sealing liquid being maintained at a predetermined pressure; second conduit means for introducing a second sealing liquid into said clearance space between said first seal ring and said shaft, said second sealing liquid being maintained at a pressure not exceeding the pressure of said first sealing liquid, said first sealing liquid being disposed in said clearance space between said first seal ring and said shaft intermediate said liquid discharge chamber and said second sealing liquid; a first stationary chamber surrounding said shaft adjacent said first seal ring, said first stationary chamber communicating with said clearance space between said first seal ring and said shaft, said first stationary chamber receiving said first and said second sealing liquids expelled from said clearance space between said first seal ring and said shaft, said first stationary chamber being maintained at a predetermined pressure; first labyrinth seal means for sealing said first stationary chamber; and, means for draining said first stationary chamber.
Claim 10
Dependent Claim
38 words
The seal of claim 7, further comprising a second stationary chamber surrounding said shaft adjacent said first stationary chamber, said second stationary chamber being maintained at a pressure greater than the pressure maintained in said first stationary chamber.
Claim 11
Dependent Claim
149 words
The seal of claim 8, wherein said first seal ring is contained in a first annular chamber adjacent said liquid discharge chamber, the radially outermost surface of said first seal ring defining an annular space within said first annular chamber, said first seal ring having a first opening extending therethrough, said first sealing liquid being introduced into said annular space by said first conduit means, said first sealing liquid passing through said first opening in said first seal ring into said clearance space between said first seal ring and said shaft; and, said first seal ring having a second opening extending therethrough, said second sealing liquid being introduced directly into said second opening in said first seal ring by said second conduit means, said second sealing liquid passing through said second opening in said first seal ring into said clearance space between said first seal ring and said shaft.
Claim 12
Dependent Claim
189 words
The seal of claim 9, further comprising: a second stationary seal ring encircling said shaft with a small clearance space adjacent said second axial side of said body member, said clearance space communicating with said liquid discharge chamber; third conduit means for introducing said first sealing liquid into said clearance space between said second seal ring and said shaft; Fourth conduit means for introducing said second sealing liquid into said clearance space between said second seal ring and said shaft, said first sealing liquid being disposed in said clearance space between said second seal ring and said shaft intermediate said liquid discharge chamber and said second sealing liquid; a third stationary chamber surrounding said shaft adjacent said second seal ring, said third stationary chamber communicating with said clearance space between said second seal ring and said shaft, said third stationary chamber receiving said first and said second sealing liquids expelled from said clearance between said second seal ring and said shaft, said third stationary chamber being maintained at a predetermined pressure; second labyrinth seal means for sealing said third stationary chamber; and, means for draining said third stationary chamber.
Claim 13
Dependent Claim
38 words
The seal of claim 10, further comprising a fourth stationary chamber surrounding said shaft adjacent said third stationary chamber, said fourth stationary chamber being maintained at a pressure greater than the pressure maintained in said third stationary chamber.
Claim 14
Dependent Claim
149 words
The seal of claim 11, wherein said second seal ring is contained in a second annular chamber adjacent said liquid discharge chamber, the radially outermost surface of said second seal ring defining an annular space within said second annular chamber, said second seal ring having a first opening extending therethrough, said first sealing liquid being introduced into said annular space by said third conduit means, said first sealing liquid passing through said first opening in said second seal ring into said clearance space between said second seal ring and said shaft; and, said second seal ring having a second opening extending therethrough, said second sealing liquid being introduced directly into said second opening in said second seal ring by said fourth conduit means, said second sealing liquid passing through said second opening in said second seal ring into said clearance space between said second seal ring and said shaft.
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) | 1977-08-19 | 1978-02-18 | 1978-08-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-19 | 1982-02-18 | 1982-08-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-19 | 1986-02-18 | 1986-08-20 | $7700.00 | Window Closed / Lapsed |