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US3580692A
Expired / Lapsed
US
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Seal construction
Assignee: RTX Corp
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Filing: 1969-07-18
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Granted: 1971-05-25
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Expires: 1989-07-18
Abstract
Abstract A seal construction of the honeycomb type for turbomachinery, the cell geometry of the honeycomb being selected and arranged to provide an increase in boundary layer stability and an improvement in overall compressor or turbine performance.
Inventors
- 👤 Alojzy Mikolajczak
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 11:13
CPC Classifications
F; F01; F01D; F01D11/00; F01D11/08; F01D11/12; F01D11/127; Y; Y10; Y10S; Y10S415/00; Y10S415/914
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
212 words
In a turbofan engine, a fan rotor with at least one row of fan rotor blades extending therefrom, a fan casing surrounding the rotor blades, a honeycomb-type seal supported from the fan casiNg, the honeycomb seal being positioned over the fan rotor blades and providing a tip clearance therebetween, the honeycomb seal including a plurality of open-faced cells, each of the cells being formed by at least one wall extending from a backing strip, the backing strip also sealing one end of the cells, said openedfaced cells face the axis of the fan rotor, the open face of each of the cells being substantially parallel to the motive flow path through the fan, each of the cells has a cell depth d'''' to effective face opening as represented by length ''''1'''' ratio substantially in the range of 0.5 to 10; the effective face opening as represented by length ''''1'''' being less than one-half ''''t;'''' and the cell aerodynamic depth of each cell is determined by the formula: where d is the aerodynamic depth t is the blade tip thickness UT is the tip speed Beta is the blade stagger measured to the plane of the rotor k is a constant depending on the motive fluid P is the pressure on the blade.
Claim 2
Dependent Claim
212 words
In a turbofan engine, a fan rotor with at least one row of fan rotor blades extending therefrom, a fan casing surrounding the rotor blades, a honeycomb-type seal supported from the fan casiNg, the honeycomb seal being positioned over the fan rotor blades and providing a tip clearance therebetween, the honeycomb seal including a plurality of open-faced cells, each of the cells being formed by at least one wall extending from a backing strip, the backing strip also sealing one end of the cells, said openedfaced cells face the axis of the fan rotor, the open face of each of the cells being substantially parallel to the motive flow path through the fan, each of the cells has a cell depth d'''' to effective face opening as represented by length ''''1'''' ratio substantially in the range of 0.5 to 10; the effective face opening as represented by length ''''1'''' being less than one-half ''''t;'''' and the cell aerodynamic depth of each cell is determined by the formula: where d is the aerodynamic depth t is the blade tip thickness UT is the tip speed Beta is the blade stagger measured to the plane of the rotor k is a constant depending on the motive fluid P is the pressure on the blade.
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) | 1974-05-24 | 1974-11-23 | 1975-05-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-24 | 1978-11-23 | 1979-05-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-24 | 1982-11-23 | 1983-05-25 | $7700.00 | Window Closed / Lapsed |