Patent US3748506A successfully refreshed from Google Patents.
US3748506A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric machine of large diameter and low rotational speed having a liquid-cooled rotor
Assignee: Siemens AG
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Filing: 1971-12-20
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Granted: 1973-07-24
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Expires: 1991-12-20
Abstract
Abstract In an electric machine of large diameter and low speed of rotation, cooling liquid is fed to the rotor via standing, open chambers. The edges of the open chambers rest against the plane end face of a rotating manifold having check valves, providing a seal.
Inventors
- 👤 K Lang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 17:35
CPC Classifications
H; H02; H02K; H02K9/00; H02K9/19; H02K9/197
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
105 words
In an electric machine of large diameter and low speed of rotation, said machine having a liquid-cooled rotor having cooling ducts, including: a rotating manifold mounted at one end face of said rotor for feeding cooling liquid to said cooling ducts, said manifold having an outer end face perpendicular to the axis of the rotor; a plurality of check valves aligned with respect to said outer end face of said manifold ,being uniformly distributed along the circumference thereof; and cooling liquid supply chambers positioned at said outer end face of said having open end faces resting against said outer end face to provide sealing therewith.
Claim 2
Dependent Claim
105 words
In an electric machine of large diameter and low speed of rotation, said machine having a liquid-cooled rotor having cooling ducts, including: a rotating manifold mounted at one end face of said rotor for feeding cooling liquid to said cooling ducts, said manifold having an outer end face perpendicular to the axis of the rotor; a plurality of check valves aligned with respect to said outer end face of said manifold ,being uniformly distributed along the circumference thereof; and cooling liquid supply chambers positioned at said outer end face of said having open end faces resting against said outer end face to provide sealing therewith.
Claim 3
Dependent Claim
37 words
An electric machine as claimed in claim 1, wherein said cooling liquid travels under pressure and provides the pressure required for sealing contact of said cooling liquid supply chambers at said outer end face of said manifold.
Claim 4
Dependent Claim
20 words
An electric machine as claimed in claim 1, wherein each cooling liquid supply chamber covers at least two check valves.
Claim 5
Dependent Claim
31 words
An electric machine as claimed in claim 1, wherein said cooling liquid supply chambers are in offset arrangement with respect to each other in their positions relative to said check valves.
Claim 6
Dependent Claim
21 words
An electric machine as claimed in claim 1, wherein each cooling liquid supply chamber has a front edge comprising sealing material.
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) | 1976-07-23 | 1977-01-22 | 1977-07-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-23 | 1981-01-22 | 1981-07-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-23 | 1985-01-22 | 1985-07-24 | $7700.00 | Window Closed / Lapsed |