US3739208A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reverse flow cooling system for a dynamoelectric machine
Assignee: General Electric Co
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Filing: 1971-12-03
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Granted: 1973-06-12
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Expires: 1991-12-03
Abstract
Abstract A dynamoelectric machine with internal gas cooling system has a reverse flow pattern with gas flowing from the fan through the coolers and then to the parts to be cooled. The gas is separated into two flow portions at the cooler, one portion undergoing a low pressure drop and then serving to cool the rotor end turns and transition section, the other undergoing a relatively high pressure drop and then serving to cool the stator core and to supply the gas gap for ''''gap pickup'''' cooling of the rotor body.
Inventors
- 👤 A Shartrand
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 12:11
CPC Classifications
H; H02; H02K; H02K9/00; H02K9/14; H02K9/18
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
211 words
In a dynamoelectric machine of the type having a gas-tight casing filled with cooling gas, a stator core with radial cooling ducts, a rotor defining a gas gap with the stator core and having a body portion cooled by pumping action from the gas gap and an end turn portion, said rotor having fan means mounted thereon for circulating the cooling gas, the improvement comprising: first and second cooler sections disposed within said casing communicating directly with the outlet of said fan to cool the gas therefrom, said first cooler section being arranged and proportioned to cause a lower pressure drop of the gas flowing therethrough than said second cooler section, first conduit means conducting gas from said first cooler section to said rotor end turn portion, second conduit means conducting gas from said second cooler section and through selected stator radial cooling ducts to the gas gap, the flow path through the First cooler section and the first conduit means being arranged and proportioned to provide a lower gas pressure drop than the flow path through the second cooler section and the second conduit means, whereby a remaining pressure drop is available between the end turn portion and the gas gap for forcing cooling gas through the end turn portion.
Claim 2
Dependent Claim
211 words
In a dynamoelectric machine of the type having a gas-tight casing filled with cooling gas, a stator core with radial cooling ducts, a rotor defining a gas gap with the stator core and having a body portion cooled by pumping action from the gas gap and an end turn portion, said rotor having fan means mounted thereon for circulating the cooling gas, the improvement comprising: first and second cooler sections disposed within said casing communicating directly with the outlet of said fan to cool the gas therefrom, said first cooler section being arranged and proportioned to cause a lower pressure drop of the gas flowing therethrough than said second cooler section, first conduit means conducting gas from said first cooler section to said rotor end turn portion, second conduit means conducting gas from said second cooler section and through selected stator radial cooling ducts to the gas gap, the flow path through the First cooler section and the first conduit means being arranged and proportioned to provide a lower gas pressure drop than the flow path through the second cooler section and the second conduit means, whereby a remaining pressure drop is available between the end turn portion and the gas gap for forcing cooling gas through the end turn portion.
Claim 3
Dependent Claim
68 words
The combination according to claim 1, further including a baffle in the gas gap and fourth conduit means providing a restricted flow path from said gas gap past said baffle to the suction side of the fan means, whereby a still greater pressure drop is available between said end turn portion and the suction side of the fan means to force cooling gas through the end turn portion.
Claim 4
Dependent Claim
29 words
The combination according to claim 1, further including third conduit means from the gas gap through other stator radial cooling ducts to the suction side of the fan means.
Claim 5
Dependent Claim
27 words
The combination according to claim 1, wherein the first cooler section has cooling tubes therein less densely packed than cooling tubes disposed in said second cooling section.
Claim 6
Dependent Claim
22 words
The combination according to claim 1, wherein said first conduit means includes a longitudinal passage through the rotor beneath said fan means.
Claim 7
Dependent Claim
205 words
In a dynamoelectric machine of the type having a gas-tight casing filled with cooling gas, the combination comprising: a stator core defining spaced groups of alternating inlet and outlet radial cooling ducts, a rotor mounted within the casing and defining a gas gap with said stator core, said rotor having a body portion arranged with means to scoop gas from the gap and return it at an axially spaced location, said rotor further including end turn and transition portions defining first internal gas cooling passages through the rotor end turn and transition portions communicating with the gas gap, fan means mounted on said rotor, first and second cooler sections disposed within said casing, said first cooler section being arranged to provide a lower pressure drop for gas flowing therethrough than the second cooler section, first conduit means defining a flow path with a relatively low pressure drop from said first cooler section into the rotor, and second conduit means defining a flow path with a relatively low pressure drop from said second cooler section through the radial inlet stator cooling ducts to the gas gap, whereby an additional pressure drop is available to force gas through said first internal cooling passages to the gas gap.
Claim 8
Dependent Claim
205 words
In a dynamoelectric machine of the type having a gas-tight casing filled with cooling gas, the combination comprising: a stator core defining spaced groups of alternating inlet and outlet radial cooling ducts, a rotor mounted within the casing and defining a gas gap with said stator core, said rotor having a body portion arranged with means to scoop gas from the gap and return it at an axially spaced location, said rotor further including end turn and transition portions defining first internal gas cooling passages through the rotor end turn and transition portions communicating with the gas gap, fan means mounted on said rotor, first and second cooler sections disposed within said casing, said first cooler section being arranged to provide a lower pressure drop for gas flowing therethrough than the second cooler section, first conduit means defining a flow path with a relatively low pressure drop from said first cooler section into the rotor, and second conduit means defining a flow path with a relatively low pressure drop from said second cooler section through the radial inlet stator cooling ducts to the gas gap, whereby an additional pressure drop is available to force gas through said first internal cooling passages to the gas gap.
Claim 9
Dependent Claim
61 words
The combination according to claim 6, further including third conduit means providing a flow path from said gas gap through the outlet radial cooling ducts to the suction side of the fan means, and fifth conduit means including second internal cooling passages in the rotor body end portion through the end windings directly to the suction side of the fan means.
Claim 10
Dependent Claim
38 words
The combination according to claim 7, further including a baffle in the gas gap and fourth conduit means providing a restricted flow path from the gas gap past said baffle to the suction side of the fan means.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-06-11 | 1976-12-11 | 1977-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-11 | 1980-12-11 | 1981-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-11 | 1984-12-11 | 1985-06-12 | $7700.00 | Window Closed / Lapsed |