Patent US3814959A successfully refreshed from Google Patents.
US3814959A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cooling arrangement for rotary electric machines
Assignee: Cegelec SA
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Filing: 1972-06-23
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Granted: 1974-06-04
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Expires: 1992-06-23
Abstract
Abstract In the cooling with gas of the rotor winding heads of rotary electric machines, such as turbogenerators, having axial inlet and outlet channels for the gas disposed under the winding heads, channels are made up of a succession of axial notches within the shaft of the rotor, closed by an insulating tube which is pressed against the winding heads by centrifugal force and equipped with sealing bands or seals gliding in grooves located in the rotor shaft between the axial notches.
Inventors
- 👤 C Lehuen
- 👤 R Gillet
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 12:45
CPC Classifications
H; H02; H02K; H02K9/00; H02K9/08; H02K3/00; H02K3/04; H02K3/24
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
118 words
In a rotary electric machine, such as a turbogenerator, having a rotor shaft and a plurality of winding heads disposed annularly about said rotor shaft, means for cooling said winding heads by circulation of gas therethrough comprising a plurality of axial channels formed within the peripheral surface of said rotor shaft, a perforateD insulating tube disposed between said rotor shaft and said winding heads with the perforations thereof providing communication between said axial channels and said winding heads, and a plurality of axial seals having a variable radial thickness and being disposed between the rotor shaft and said insulating tube in the spaces between said axial channels so as to provide a fluid-tight separation between said axial channels.
Claim 2
Dependent Claim
118 words
In a rotary electric machine, such as a turbogenerator, having a rotor shaft and a plurality of winding heads disposed annularly about said rotor shaft, means for cooling said winding heads by circulation of gas therethrough comprising a plurality of axial channels formed within the peripheral surface of said rotor shaft, a perforateD insulating tube disposed between said rotor shaft and said winding heads with the perforations thereof providing communication between said axial channels and said winding heads, and a plurality of axial seals having a variable radial thickness and being disposed between the rotor shaft and said insulating tube in the spaces between said axial channels so as to provide a fluid-tight separation between said axial channels.
Claim 3
Dependent Claim
24 words
The combination defined in claim 1 wherein said insulating tube is provided in at least two parts and is made of a rigid material.
Claim 4
Dependent Claim
146 words
In a rotary electric machine, such as a turbogenerator, having a rotor shaft and a plurality of winding heads disposed annularly about said rotor shaft, means for cooling said winding heads by circulation of gas therethrough, comprising a plurality of axial channels forming conduits in said rotor shaft, a perforated insulating tube disposed between said rotor shaft and said winding heads with the perforations thereof providing communication between said axial channels and said winding heads, and a plurality of axial seals having a variable radial thickness and being disposed between the rotor shaft and said insulating tube in the spaces between said axial channels so as to provide a fluid-tight separation between said axial channels, wherein said axial seals are formed of rigid bands secured to the inner surface of said insulating tube and extending into respective notches in said rotor shaft between said axial channels.
Claim 5
Dependent Claim
146 words
In a rotary electric machine, such as a turbogenerator, having a rotor shaft and a plurality of winding heads disposed annularly about said rotor shaft, means for cooling said winding heads by circulation of gas therethrough, comprising a plurality of axial channels forming conduits in said rotor shaft, a perforated insulating tube disposed between said rotor shaft and said winding heads with the perforations thereof providing communication between said axial channels and said winding heads, and a plurality of axial seals having a variable radial thickness and being disposed between the rotor shaft and said insulating tube in the spaces between said axial channels so as to provide a fluid-tight separation between said axial channels, wherein said axial seals are formed of rigid bands secured to the inner surface of said insulating tube and extending into respective notches in said rotor shaft between said axial channels.
Claim 6
Dependent Claim
34 words
The combination defined in claim 3 wherein a ventilator is disposed on said rotor shaft adjacent said plurality of winding heads to aid in the movement of said cooling gases through said winding heads.
Claim 7
Dependent Claim
28 words
The combination defined in claim 4 wherein a plurality of keys are disposed between said ventilator and said insulating tube above at least some of said axial channels.
Claim 8
Dependent Claim
43 words
The combination defined in claim 5 wherein inlet openings are provided for alternate ones of said axial channels and outlet openings are provided for the remaining axial channels so that the axial channels form alternate inlet and outlet passages for the cooling gas.
Claim 9
Dependent Claim
24 words
The combination defined in claim 6 wherein said insulating tube is provided in at least two parts and is made of a rigid material.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-06-03 | 1977-12-03 | 1978-06-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-03 | 1981-12-03 | 1982-06-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-03 | 1985-12-03 | 1986-06-04 | $7700.00 | Window Closed / Lapsed |