Patent US4722668A successfully refreshed from Google Patents.
US4722668A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for damping blade vibrations in turbo-machines
Assignee: BBC Brown Boveri AG Switzerland
•
Filing: 1986-08-20
•
Granted: 1988-02-02
•
Expires: 2006-08-20
Abstract
Abstract In order to damp blade vibrations, the shroud plates of the blades are equipped with magnet inserts.
Inventors
- 👤 Peter Novacek
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 06:48
CPC Classifications
F; F01; F01D; F01D5/00; F01D5/12; F01D5/22; F01D5/225; F05; F05D; F05D2260/00; F05D2260/96; Y; Y10; Y10S; Y10S416/00; Y10S416/50
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
49 words
A device for damping blade vibrations in blades of turbomachines, comprising a plurality of magnets, at least one of said magnets being mounted in each of the blades, said magnets being located in the blades such that the magnets of neighboring blades interact with each other to reduce vibration.
Claim 2
Independent Claim
49 words
A device for damping blade vibrations in blades of turbomachines, comprising a plurality of magnets, at least one of said magnets being mounted in each of the blades, said magnets being located in the blades such that the magnets of neighboring blades interact with each other to reduce vibration.
Claim 3
Dependent Claim
18 words
The device as claimed in claim 1, wherein the magnets are integrated in shroud plates of the blades.
Claim 4
Dependent Claim
18 words
The device as claimed in claim 1, wherein the polarity of neighbouring magnets can be in any direction.
Claim 5
Independent Claim
43 words
A device for damping vibrations in blades of a turbomachine, comprising: at least one magnet mounted to each blade, said magnets being located such that a positive region of each magnet contacts a negative region of a magnet mounted to an adjacent blade.
Claim 6
Independent Claim
43 words
A device for damping vibrations in blades of a turbomachine, comprising: at least one magnet mounted to each blade, said magnets being located such that a positive region of each magnet contacts a negative region of a magnet mounted to an adjacent blade.
Claim 7
Dependent Claim
21 words
The device as claimed in claim 4, wherein said blades include shroud plates, said magnets being mounted to the shroud plates.
Claim 8
Dependent Claim
53 words
The device as claimed in claim 5, wherein said magnets are mounted in a region of blade inlet flow, and further comprising additional magnets mounted to the other side of the shroud plates, said additional magnets being arranged such that the polarity of adjacent magnets causes the adjacent magnets to repel one another.
Claim 9
Dependent Claim
20 words
The device as claimed in claim 4, wherein the magnets are integrated into opposite end surfaces of the shroud plate.
Claim 10
Dependent Claim
22 words
The device as claimed in claim 5, wherein the magnets extend from the shroud plates such that the magnets contact each other.
Claim 11
Dependent Claim
23 words
The device as claimed in claim 5, wherein the magnets are arranged relative to one another such that their end pieces butt together.
References Cited (Backward Citations)
US2198784A
Cited
US2430140A
Cited
US2906899A
Cited
US2942843A
Cited
US3185441A
Cited
FR1374917A
Cited
DE1299004B
Cited
US3576377A
Cited
US3612718A
Cited
US3752599A
Cited
FR2329845A1
Cited
GB1503453A
Cited
US4200003A
Cited
JPS5392007A
Cited
US4257743A
Cited
JPS56147940A
Cited
JPS56165777A
Cited
JPS5738602A
Cited
US4502652A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-02-01 | 1991-08-03 | 1992-02-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-02-01 | 1995-08-03 | 1996-02-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-02-01 | 1999-08-03 | 2000-02-02 | $7700.00 | Window Closed / Lapsed |