Patent US1199998A successfully refreshed from Google Patents.
US3574480A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Semiaxial fan rotor
Assignee: Siemens AG
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Filing: 1968-11-25
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Granted: 1971-04-13
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Expires: 1988-11-25
Abstract
Abstract The vanes of a fan rotor have an outer contour shaped as a circular arc concentric to the hub axis of the rotor, whereas the inner contour of the vanes, where the vanes are joined with the hub, have a curvature reversed with respect to that of the outer contour. The outer region of the fan rotor acts essentially as an axial fan, whereas on account of the reversal and curvature the inner region of the vanes produces a radial fan action.
Inventors
- 👤 Leo Hoepfner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 22:09
CPC Classifications
F; F04; F04D; F04D29/00; F04D29/26; F04D29/28; F04D29/30
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
117 words
In combination with a fan rotor having a central hub portion and fan vanes mounted on and peripheRally distributed about said hub portion and protruding outwardly away therefrom, the improvements according to which said fan vanes each have contour surface means for providing a substantially axial fan action in said outer region and a substantially radial action near said hub portion, a housing jacket coaxially surrounding said rotor, said vanes having approximately 40 to 60 percent of their extent protruding out of said jacket in the direction of the airflow, and a baffle plate mounted in axially spaced relation from said vanes at the protruding side thereof and extending in a plane perpendicular to the rotor axis.
Claim 2
Dependent Claim
117 words
In combination with a fan rotor having a central hub portion and fan vanes mounted on and peripheRally distributed about said hub portion and protruding outwardly away therefrom, the improvements according to which said fan vanes each have contour surface means for providing a substantially axial fan action in said outer region and a substantially radial action near said hub portion, a housing jacket coaxially surrounding said rotor, said vanes having approximately 40 to 60 percent of their extent protruding out of said jacket in the direction of the airflow, and a baffle plate mounted in axially spaced relation from said vanes at the protruding side thereof and extending in a plane perpendicular to the rotor axis.
Claim 3
Dependent Claim
30 words
In a fan rotor according to claim 1, the spacing between said vanes and said baffle plate being approximately 40 to 60 percent of the axial extent of said vanes.
Claim 4
Dependent Claim
27 words
In a fan rotor according to claim 1, said baffle plate being firmly joined with said housing jacket and forming a support for a fan drive motor.
Claim 5
Dependent Claim
51 words
In a fan rotor according to claim 1, said fan vanes each having a peripheral edge outlining said surface contour means, said peripheral edge having a circular-arc profile at the radially outer region of said vane and a profile reversal toward the hub axis at the forward edge of said vane.
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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) | 1974-04-12 | 1974-10-12 | 1975-04-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-12 | 1978-10-12 | 1979-04-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-12 | 1982-10-12 | 1983-04-13 | $7700.00 | Window Closed / Lapsed |