US3809934A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gas-cooled electrical generator
Assignee: BBC Brown Boveri AG Switzerland
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Filing: 1973-04-20
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Granted: 1974-05-07
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Expires: 1993-04-20
Abstract
Abstract A gas-cooled dynamo-electric machine such as a turbo-driven generator includes cooling channels extending radially through the stator to the gap between it and the rotor, and also cooling channels extending both axially and radially through the rotor, for the circulation of a cooling gas. The rotor is stepped longitudinally into a series of successive stages alternating in diameter thereby to establish corresponding zones alternating in gap width. The radially inner ends of those cooling channels in the stator component carrying gas radially inward and axially correlated with the zones having the larger gap width are provided with vanes profiled to effect a reduction in the impact losses at the gas entrance ends of the axially correlated radial channels in the rotor component, and the radially inner ends of those cooling channels in the stator component carrying gas radially outward and axially correlated with the zones having the smaller gap are provided with vanes profiled to recover the velocity energy of the cooling gas discharged into the gap from the radial channels in the rotor component functioning as the flow channels of a radial compressor.
Inventors
- 👤 E Toplak
- 👤 J Baer
- 👤 D Sommer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 02:38
CPC Classifications
H; H02; H02K; H02K9/00
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
329 words
A gas-cooled dynamo-electric machine comprising a slotted stator component having a winding disposed in its slots, a slotted rotor component having a winding disposed in its slots and which is mounted for rotation within the stator component with a running radial gap therebetween, said stator component being provided with a system of internal distributed cooling channels extending radially from said gap to the periphery thereof, said rotor component being provided with a system of internal distributed cooling channels extending axially and thence radially to said gap, the periphery of said rotor component being stepped into a series of successive longitudinally extending stages alternating in diameter whereby to establish consecutive longitudinally extending zones alternating in gap width, means for circulating a cooling gas through the channels provided in said stator and rotor components such that flow paths are established radially outward from the rotor component at the zones having the smaller gap width and thence across said gap and radially outward through the channels in said stator component axially correlated therewith, other flow paths also being established radially inward through the channels of said stator component at the zones having the larger gap width and thence across said gap and radially inward through the channels in said rotor component axially correlated therewith, a first set of deflecting vanes disposed at the radially inner ends of those channels in the stator component axially correlated with the zones having the larger gap width and which are profiled to effect a reduction in the impact losses at the entrance ends of the axially correlated radial channels in said rotor component, and a second set of deflecting vanes disposed at the radially inner ends of those channels in the stator component axially correlated with the zones having the smaller gap and which are profiled to recover the velocity energy of the cooling gas discharged into the gap from the radial channels in said rotor component functioning as the flow channels of a radial compressor.
Claim 2
Dependent Claim
329 words
A gas-cooled dynamo-electric machine comprising a slotted stator component having a winding disposed in its slots, a slotted rotor component having a winding disposed in its slots and which is mounted for rotation within the stator component with a running radial gap therebetween, said stator component being provided with a system of internal distributed cooling channels extending radially from said gap to the periphery thereof, said rotor component being provided with a system of internal distributed cooling channels extending axially and thence radially to said gap, the periphery of said rotor component being stepped into a series of successive longitudinally extending stages alternating in diameter whereby to establish consecutive longitudinally extending zones alternating in gap width, means for circulating a cooling gas through the channels provided in said stator and rotor components such that flow paths are established radially outward from the rotor component at the zones having the smaller gap width and thence across said gap and radially outward through the channels in said stator component axially correlated therewith, other flow paths also being established radially inward through the channels of said stator component at the zones having the larger gap width and thence across said gap and radially inward through the channels in said rotor component axially correlated therewith, a first set of deflecting vanes disposed at the radially inner ends of those channels in the stator component axially correlated with the zones having the larger gap width and which are profiled to effect a reduction in the impact losses at the entrance ends of the axially correlated radial channels in said rotor component, and a second set of deflecting vanes disposed at the radially inner ends of those channels in the stator component axially correlated with the zones having the smaller gap and which are profiled to recover the velocity energy of the cooling gas discharged into the gap from the radial channels in said rotor component functioning as the flow channels of a radial compressor.
Claim 3
Dependent Claim
110 words
A gas-cooled dynamo-electric machine as defined in claim 1 wherein the rotor component is provided with an impeller thereon from the discharge side of which cooling gas is directed through axially extending cooling channels provided in said rotor component and is also directed through the cooling channels provided in said stator component for one zone in a radially inward direction across said gap into radial cooling channels provided in said rotor component of that zone, thence back through the gap in the adjacent zone and radially outward through the cooling channels provided in said stator component correlated to said adjacent zone and thence to the intake side of said impeller.
Claim 4
Dependent Claim
32 words
A gas-cooled dynamo-electric machine as defined in claim 1 wherein said first and second sets of deflecting vanes constitute integral parts of keys for fixing the stator windings in their respective slots.
Claim 5
Dependent Claim
28 words
A gas-cooled dynamo-electric machine as defined in claim 1 wherein said first and second sets of deflecting vanes extend into said gap between said stator and rotor components.
Claim 6
Dependent Claim
30 words
A gas-cooled dynamo-electric machine as defined in claim 1 wherein said axially and radially extending cooling channels in said rotor component are established in the slots containing the rotor winding.
Claim 7
Dependent Claim
25 words
A gas-cooled dynamo-electric machine as defined in claim 1 wherein the larger diameter zones of said rotor component are established by labyrinth-like contact-free sealing rings.
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) | 1977-05-06 | 1977-11-05 | 1978-05-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-05-06 | 1981-11-05 | 1982-05-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-05-06 | 1985-11-05 | 1986-05-07 | $7700.00 | Window Closed / Lapsed |