US3835919A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for cooling electric machines, particularly turbogenerators
Assignee: Kraftwerk Union AG
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Filing: 1973-02-20
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Granted: 1974-09-17
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Expires: 1993-02-20
Abstract
Abstract To cool turbogenerators having water-cooled stator and rotor windings and a cooling-water connecting head at the end of the rotor shaft, an intermediate tank containing a gas cushion maintained at a pressure slightly higher than atmospheric is interposed between a main water tank that is at elevated pressure and a water chamber that is at reduced pressure and is located adjacent a cooling-water discharge chamber. Water accumulating in the intermediate tank is fed back to the main water tank by a booster pump.
Inventors
- 👤 D Lambrecht
- 👤 E Weghaupt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 02:55
CPC Classifications
H; H02; H02K; H02K9/00; H02K9/19; H02K9/193
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
152 words
In a system for cooling electric machines of the type having a rotor mounted on a shaft and water-cooled stator and rotor windings, comprising a cooling-water connecting head located at an end of the rotor shaft and having a cooling-water inlet chamber and a cooling-water outlet chamber, circulatory means interconnecting said inlet and outlet chambers, an external water tank connected in said circulatory means between said inlet and outlet chambers, and means for maintaining a gas cushion at elevated pressure within said external water tank: a pressurereducing water chamber located adjacent and communicating with said outlet chamber, an intermediate tank connected between said pressure-reducing water chamber and said external water tank and having an air cushion therein at a pressure slightly higher than atmospheric pressure, and booster pump means connected between said intermediate tank and said external water tank for recirculating water accumulating in said intermediate tank to said external water tank.
Claim 2
Dependent Claim
152 words
In a system for cooling electric machines of the type having a rotor mounted on a shaft and water-cooled stator and rotor windings, comprising a cooling-water connecting head located at an end of the rotor shaft and having a cooling-water inlet chamber and a cooling-water outlet chamber, circulatory means interconnecting said inlet and outlet chambers, an external water tank connected in said circulatory means between said inlet and outlet chambers, and means for maintaining a gas cushion at elevated pressure within said external water tank: a pressurereducing water chamber located adjacent and communicating with said outlet chamber, an intermediate tank connected between said pressure-reducing water chamber and said external water tank and having an air cushion therein at a pressure slightly higher than atmospheric pressure, and booster pump means connected between said intermediate tank and said external water tank for recirculating water accumulating in said intermediate tank to said external water tank.
Claim 3
Dependent Claim
45 words
Device according to claim 1 including means connecting said external water tank and said intermediate tank so as to afford communication between the respective gas cushions therein, and a pressure-reducing valve connected in said connecting means between said external water tank and said intermediate tank.
Claim 4
Dependent Claim
14 words
Device according to claim 1 including a safety valve connected to said intermediate tank.
Claim 5
Dependent Claim
24 words
Device according to claim 1 including water-level control means for regulating outflow of water accumulated in said intermediate tank to said external water tank.
Claim 6
Dependent Claim
95 words
Device according to claim 1 including a further chamber adjacent said pressure-reducing water chamber and having a pair of opposite walls, shaft sealing means disposed between respective ends of said walls and the rotor shaft and being adapted to admit atmospheric air and water tapped from said outlet chamber into said further chamber, and circuit means connecting said further chamber and said external water tank for recirculating the tapped water received in said further chamber to said external water tank, said circuit means including a collecting tank, a pump and oxygen-removing catalyzer means connected therein.
References Cited (Backward Citations)
US2970232A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-09-16 | 1978-03-18 | 1978-09-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-16 | 1982-03-18 | 1982-09-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-16 | 1986-03-18 | 1986-09-17 | $7700.00 | Window Closed / Lapsed |