US4284388A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Moving blade for thermic axial turbomachines
Assignee: Polska Akademia Nauk Instytut Maszyn Przeplywowych
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Filing: 1979-02-01
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Granted: 1981-08-18
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Expires: 1999-02-01
Abstract
Abstract The invention finds application in the manufacture of working blades of a length exceeding that of the blades known so far, without infringing the limitations issuing from flow considerations and strength of the rotor. The blade comprises two different sheets deliminated by a suitably selected intermediary cross section of the blade. Each of the sheets is formed according to a different law dictated by strength and flow considerations. Beginning from the cross-section which delimits the sheets, the sheets are twisted in opposite directions.
Inventors
- 👤 Robert Szewalski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 07:53
CPC Classifications
F; F01; F01D; F01D5/00; F01D5/12; F01D5/14; F01D5/141
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
112 words
An axial flow turbomachine rotor blade twisted from root to the tip in order to match fluid angles at entry and exit at different radii, according to a predetermined vortex flow pattern, said blade being tapered simultaneously in order to continuously reduce the cross-section from root to the tip, wherein: entry flow angles first diminish continuously from a large value at blade tip down to a minimum value at a predetermined radius of division of the whole blade length into two portions of different vortex-flow patterns, and then said angles increase again down to the root section, and having the exit angle changing continuously from tip to the root in one direction.
Claim 2
Dependent Claim
112 words
An axial flow turbomachine rotor blade twisted from root to the tip in order to match fluid angles at entry and exit at different radii, according to a predetermined vortex flow pattern, said blade being tapered simultaneously in order to continuously reduce the cross-section from root to the tip, wherein: entry flow angles first diminish continuously from a large value at blade tip down to a minimum value at a predetermined radius of division of the whole blade length into two portions of different vortex-flow patterns, and then said angles increase again down to the root section, and having the exit angle changing continuously from tip to the root in one direction.
References Cited (Backward Citations)
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Cited
US3065933A
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US3169694A
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Cited
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Cited
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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) | 1984-08-17 | 1985-02-16 | 1985-08-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-08-17 | 1989-02-16 | 1989-08-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-08-17 | 1993-02-16 | 1993-08-18 | $7700.00 | Window Closed / Lapsed |