Patent US3680363A successfully refreshed from Google Patents.
US3680363A
Expired / Lapsed
US
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Devices for detecting and processing vibrations occurring in the moving blades of a rotary compressor or similar apparatus
Assignee: Safran Aircraft Engines SAS
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Filing: 1970-10-06
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Granted: 1972-08-01
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Expires: 1990-10-06
Abstract
Abstract A device for detecting vibrations in the moving blades of a rotary compressor, comprising a pick-up implanted in the internal edge of the pick-up, the signal from which is applied exclusively to an electronic circuit comprising means for deriving from it the modulation ratio and for deriving from said ratio, when it exceeds a predetermined threshold, an electrical signal. The application of this device is to the suppression of vibrations due to airflow break-up or break-away effects in the blading of aircraft jet engine compressors.
Inventors
- 👤 Robert Gustave Holz
- 👤 Adolf Braun
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 11:01
CPC Classifications
G; G05; G05D; G05D13/00; G05D13/62; G01; G01H; G01H1/00; G01H1/003; G01H1/006; G01P; G01P3/00; G01P3/42; G01P3/44; G01P3/48
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
120 words
A device for sensing and monitoring the vibrations occurring in the moving blades of a rotary compressor housing, comprising: a single sensor mounted through a passage so that the operative end of the sensor is flush with the internal wall of the compressor housing, said sensor producing an electrical signal which varies as a function of the successive displacements of the compressor blades past said sensor, an electronic circuit connected to said sensor and including means for deriving an electrical signal corresponding to the modulation of the normal frequency of the moving blades, a threshold stage producing an electrical output signal when said modulation exceeds a predetermined value, means responsive to said output signal for monitoring said electrical output signal.
Claim 2
Independent Claim
120 words
A device for sensing and monitoring the vibrations occurring in the moving blades of a rotary compressor housing, comprising: a single sensor mounted through a passage so that the operative end of the sensor is flush with the internal wall of the compressor housing, said sensor producing an electrical signal which varies as a function of the successive displacements of the compressor blades past said sensor, an electronic circuit connected to said sensor and including means for deriving an electrical signal corresponding to the modulation of the normal frequency of the moving blades, a threshold stage producing an electrical output signal when said modulation exceeds a predetermined value, means responsive to said output signal for monitoring said electrical output signal.
Claim 3
Dependent Claim
15 words
A device as claimed in claim 1, in which said monitoring means comprise a tachometer.
Claim 4
Dependent Claim
16 words
A device as claimed in claim 1, in which said monitoring means comprise a vibration recorder.
Claim 5
Dependent Claim
24 words
A device as claimed in claim 1 further comprising means for eliminating vibrations of said moving blades in response to said electrical output signal.
Claim 6
Dependent Claim
18 words
A device as claimed in claim 4, further comprising a monostable trigger for controlling said means for eliminating.
Claim 7
Dependent Claim
27 words
A device as claimed in claim 5, further comprising means for locking said monostable trigger at frequencies lower than the normal operating frequency of the moving blades.
References Cited (Backward Citations)
US3289073A
Cited
US3058339A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-08-01 | 1976-01-31 | 1976-08-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-01 | 1980-01-31 | 1980-08-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-01 | 1984-01-31 | 1984-08-01 | $7700.00 | Window Closed / Lapsed |