US3720419A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fabricated labyrinth seal structure
Assignee: Westinghouse Electric Corp
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Filing: 1971-01-21
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Granted: 1973-03-13
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Expires: 1991-01-21
Abstract
Abstract Inherent flexibility is incorporated in a labyrinth seal structure for a rotatable member by providing a relatively thin arcuately segmented corrugated metal sheet having honeycomb metal seals secured to the ridges of the corrugated metal sheet, thereby precluding the need for the spring-backed grooved seal rings previously utilized in labyrinth seals.
Inventors
- 👤 R Adelizzi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 09:36
CPC Classifications
F; F01; F01D; F01D11/00; F01D11/02; F16; F16J; F16J15/00; F16J15/44; F16J15/444
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
96 words
A labyrinth seal structure for a rotatable member, said seal structure comprising a generally cylindrical back-up member spaced from and encircling the rotatable member, a relatively thin, generally cylindrical, corrugated sheet metal member encircling the rotatable member within the back-up member and being attached to the back-up member at the ends of the sheet metal member, the corrugations of said sheet metal member extending circumferentially to form a plurality of circular, substantially parallel ridges spaced apart axially of the sheet metal member, and seal rings secured to said ridges in close proximity to the rotatable member.
Claim 2
Dependent Claim
96 words
A labyrinth seal structure for a rotatable member, said seal structure comprising a generally cylindrical back-up member spaced from and encircling the rotatable member, a relatively thin, generally cylindrical, corrugated sheet metal member encircling the rotatable member within the back-up member and being attached to the back-up member at the ends of the sheet metal member, the corrugations of said sheet metal member extending circumferentially to form a plurality of circular, substantially parallel ridges spaced apart axially of the sheet metal member, and seal rings secured to said ridges in close proximity to the rotatable member.
Claim 3
Dependent Claim
96 words
A labyrinth seal structure for a rotatable member, said seal structure comprising a generally cylindrical back-up member spaced from and encircling the rotatable member, a relatively thin, generally cylindrical, corrugated sheet metal member encircling the rotatable member within the back-up member and being attached to the back-up member at the ends of the sheet metal member, the corrugations of said sheet metal member extending circumferentially to form a plurality of circular, substantially parallel ridges spaced apart axially of the sheet metal member, and seal rings secured to said ridges in close proximity to the rotatable member.
Claim 4
Dependent Claim
96 words
A labyrinth seal structure for a rotatable member, said seal structure comprising a generally cylindrical back-up member spaced from and encircling the rotatable member, a relatively thin, generally cylindrical, corrugated sheet metal member encircling the rotatable member within the back-up member and being attached to the back-up member at the ends of the sheet metal member, the corrugations of said sheet metal member extending circumferentially to form a plurality of circular, substantially parallel ridges spaced apart axially of the sheet metal member, and seal rings secured to said ridges in close proximity to the rotatable member.
Claim 5
Dependent Claim
18 words
A labyrinth seal as defined in claim 1 in which said seal rings are made of honeycomb metal.
Claim 6
Dependent Claim
21 words
A labyrinth seal as defined in claim 1 in which said sheet metal member has sufficient flexibility to compensate for misalignment.
References Cited (Backward Citations)
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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) | 1976-03-12 | 1976-09-11 | 1977-03-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-12 | 1980-09-11 | 1981-03-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-12 | 1984-09-11 | 1985-03-13 | $7700.00 | Window Closed / Lapsed |